GB 17918-1999 Safety regulations for dust explosion prevention in bulk grain loading and unloading systems at ports
Some standard content:
GB17918—1999
This standard is based on the actual situation of my country's ports and is compiled by adopting the American Fire Protection Association NFPA61B "Standard for Fire and Explosion Protection of Bulk Agricultural Products Warehouses and Facilities (1989 Edition)". This standard is proposed by the Work Safety Bureau of the State Economic and Trade Commission of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for Dust Explosion Protection Standardization. The drafting units of this standard are: Tianjin Port Authority, Guangzhou Port Authority, Safety and Environmental Protection Research Institute of the Ministry of Metallurgy, Shanghai Port Authority, Qinhuangdao Port Authority. The main drafters of this standard are: Xu Jinghong, Jiang Xiongbiao, Zhou Hao, Zhang Yusheng, Mai Jianwei, Yuan Yi, Xu Fengtong. 720
1 Scope
National Standard of the People's Republic of China
Safety regulation for dust explosion protectionIn raw grain loading and unloading system in port This standard specifies the basic requirements for dust explosion protection in bulk grain loading and unloading system in port. This standard applies to the design, construction, operation and management of dust explosion prevention in bulk grain loading and unloading systems in ports. 2 Referenced standards
GB 17918--1999
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB15577--1995 Dust explosion safety regulations GB/T15604—1995 Dust explosion terminology
GB/T15605--1995 Dust explosion pressure relief guide GB/T17919—1999 Explosion-proof guide for dust collectors in dust explosion hazardous areas GBJ16--1987 Code for fire protection design of buildings
GB 50057—-1994
Code for lightning protection design of buildings
Code for design of electrical installations in explosion and fire hazardous environments GB 50058--19921
3 Definitions
This standard adopts the following definitions.
3.1 Raw grain loading and unloading system in port The general term for equipment, facilities and buildings (structures) for bulk grain loading and unloading operations in ports. 3.2 Silo
A vertical cylindrical enclosed structure for storing bulk materials. 3.3 Bulk cargoes store house A room-type structure for storing bulk materials.
3.4 Headhouse
A building (structure) equipped with equipment (devices) such as conveying, weighing and dust removal. 3.5 Galleries
A long corridor or trestle equipped with bulk grain conveying machinery. 3.6 Dust explosion protection Measures to prevent dust explosions and reduce the degree of explosion hazards after dust explosions occur, approved by the State Administration of Quality and Technical Supervision on November 29, 1999 and implemented on August 1, 2000
4 General provisions
GB 17918—1999
4.1 All newly built bulk grain loading and unloading systems in ports (hereinafter referred to as "systems") shall be designed, constructed and completed for dust explosion protection in accordance with this standard; existing systems shall be retrofitted for explosion protection in accordance with this standard. 4.2 The person in charge of the enterprise where the system is located shall clearly define the dust explosion hazardous places included in the system, and shall formulate dust explosion implementation rules and safety checklists in accordance with this standard and in combination with the actual situation of the unit. 4.3 System operators shall first receive dust explosion safety knowledge education and be allowed to take up their posts after passing the examination. 4.4 The temperature and dust measuring instruments, meters and fire and explosion prevention facilities in the system shall be regularly inspected and kept in good working condition. 4.5 Prevent open flames
4.5.1 Non-productive open flames should not appear in the system. 4.5.2 Inflammable and explosive items should not be stored in the system. 4.6 Prevent friction and collision sparks
4.6.1 Devices for removing iron and other debris from bulk grain should be installed at appropriate locations in the system. 4.6.2 Explosion-proof tools should be used when performing inspection and maintenance operations; iron tools should not be used to knock on walls, metal objects, etc. 4.6.3 All equipment bearings should be dust-proof and sealed. 4.6.4 Personnel entering the system should not wear work shoes with iron nails. 4.7 Prevent electrical sparks
4.7.1 The power design in the system should comply with the relevant provisions of GB50058. 4.7.2 Ordinary electrical equipment can be installed in the control room with double isolation and sealed doors in the system. 4.7.3 Personnel entering closed containers such as silos should wear anti-static work clothes and anti-static shoes. 4.8 Dust Cleaning
4.8.1 A regular cleaning system should be established. Rotating and heating parts should be cleaned every day. 4.8.2 The dust accumulation of dust removal facilities should be checked once every ship (if the dust content of bulk grain is large, the inspection interval can be shortened), and a regular replacement system for filter bags or filter elements and a regular cleaning system should be established. 4.8.3 Compressed air should not be used for cleaning operations; vacuum dust collection devices should be used for cleaning operations. 4.9 Each enterprise should conduct regular explosion-proof safety inspections according to the actual situation on site and the implementation rules and safety inspection forms for dust explosion prevention. 5 Open flame operation
5.1 Safety measures for open flame operation
5.1.1 During open flame operation, the system should stop running. All floors and walls within a radius of 10m with the open flame operation point as the center should be cleaned and wetted; non-movable combustible materials or dust-containing equipment pipes, ports and connections should be covered and protected with flame-retardant materials. 5.1.2 When the work site is inside a building, all doors and windows within a 10m radius of the open flame operation should be opened. 5.1.3 When working on a pipe connected to a closed container, the following measures should be taken: a) If there is an isolation valve, ensure that it is tightly closed; b) If there is no isolation valve, a section of the pipe should be removed and the pipe mouth should be sealed or the pipe should be isolated with an isolation board. 5.1.4 When open flame work is carried out on the top of the warehouse, all warehouse roof holes, ventilation and dust removal ports, etc. within a 10m radius of the open flame operation point should be covered and covered with non-combustible materials
5.1.5 The open flame operation site should be supervised by a dedicated person and equipped with sufficient fire extinguishing equipment. 5.2 Safety management of open flame work
5.2.1 Enterprises should divide dangerous and sub-dangerous fire prevention and explosion-proof open flame operation areas according to their own conditions and clarify the approval departments and authorities of each area.
2 The enterprise shall formulate fire prevention and explosion prevention safety 5.2.2
operation (management) procedures for the whole process from applying for open fire operation form (or certificate), preparing for open fire operation on site to completing the operation, and strictly implement them. 722
6 Requirements for buildings (structures)
6.1 Simple warehouses
GB 17918—1999
6.1.1 The distance between simple warehouses with reinforced concrete structure and personnel concentration areas shall be greater than 30m. The distance between simple warehouses with metal structure or reinforced concrete frame structure and personnel concentration areas shall be greater than 15m. 6.1.2 According to the provisions of GBJ16, the fire hazard of simple warehouses belongs to Class B, and its fire resistance level shall not be lower than Level 2. Its building fire protection design shall comply with the relevant provisions of GBJ16.
6.1.3 Simple warehouses shall take lightning protection measures in accordance with the relevant provisions of GB50057. 6.1.4 The surface of the silo wall should be flat and smooth to reduce dust accumulation. 6.1.5 No structural holes or connected air holes should be left between silos. 6.1.6 The silo roof should be a light structure or equipped with explosion vents. 6.1.7 A manhole should be provided on the top of the reinforced concrete silo to facilitate inspection, cleaning, fire extinguishing and maintenance and to prevent dust from escaping from the silo.
6.1.8 Dust explosion-proof lamps should be used when inspecting the interior of the silo. 6.2 Bulk grain warehouse
6.2.1 The warehouse should be an independent building.
6.2.2 The warehouse should meet the requirements of 6.1.1, 6.1.4, 6.1.5 and 6.1.6. 6.2.3 The bulk grain should be fed into the warehouse sequentially from one end to the other to allow enough space for dust to sink. 6.2.4 Multiple passages should be designed in warehouses according to the size of the area and in accordance with GBJ16. 6.2.5 Asphalt is not allowed to be used to pave the floor surface of the warehouse. 6.3 Work Building
6.3.1 The distance between the brick-concrete work building and the personnel concentration area should be greater than 30m. When the work building adopts metal structure or reinforced concrete frame structure, the distance between it and the personnel concentration area should be greater than 15m. 6.3.2 According to the provisions of GBJ16, the fire hazard of the work building belongs to Class B, and its fire resistance level should not be lower than Class II. The specific design should comply with the relevant provisions of GBJ16.
6.3.3 The work building should take lightning protection measures in accordance with the relevant provisions of GB50057. 6.3.4 The work building should adopt metal structure or reinforced concrete frame structure; the floor slab should adopt steel grid sub-slab (non-equipment installation part), doors and windows should open outwards, and the door and window glass should be installed outside the door and window frames. 6.3.5 The newly designed bucket elevator should be installed outside the work building. 6.4 Ancillary buildings
6.4.1 According to the provisions of GBJ16, the fire hazard of the road and filling bag room belongs to Class B, and its fire resistance level should not be lower than Level 2. Its building fire protection design should comply with the relevant provisions of GBJ16.
6.4.2 The corridor should take explosion relief measures according to GB/T15605. 6.4.3 The power distribution room and the central control room should be set outside the work building; if set inside the work building, they should be separated by a non-combustible protective wall with a fire resistance limit of not less than 3h, and there should be a safe exit directly to the outdoors or an evacuation staircase. 7 Bulk grain loading and unloading machinery and conveying equipment
7.1 General
7.1.1 Sealed continuous ship loading (unloading) machinery and conveying equipment should be used. 7.1.2 Gates and valves in the system should be pneumatic. 7.1.3 The tapes used for various types of loading and unloading machinery and conveying equipment should be anti-static and flame-retardant tapes, and the tapes should not be combined with steel. 7.1.4 Ship loading (unloading) machinery and conveying equipment should have emergency stop devices. 7.1.5 All ship loading (unloading) machinery should have independent ventilation and dust removal devices. 723
7.2 Belt-type ship unloader
GB 17918--1999
7.2.1 The unloading chute or pipe of each part should be sealed and made of non-combustible materials, and the upper part should be equipped with explosion vents. 7.2.2 Dust removal measures should be taken at the parts where material drop occurs. 7.2.3 The lifting part and the horizontal conveying part should be equipped with safety devices to prevent the belt from slipping (stalling) and running off, and the alarm can be automatically stopped when the limit is exceeded.
7.2.4 When unloading bulk grain, the operation should be checked at any time to prevent the belt from overheating due to side seal and slide failure. 7.3 Screw ship unloader
7.3.1 The conveying part should be a fully enclosed shell with an explosion relief device. 7.3.2 The bearings should be sealed bearings.
7.4 Chain conveyor ship unloader
7.4.1 The conveying part should have a fully enclosed shell and should be made of non-combustible materials. 7.4.2 Wear-resistant and anti-static plastic guide plates should be used; the guide plate joints should be aligned, and the left and right deviations should not exceed 1.5mm. 7.4.3 Dust covers should be installed on the inlet and discharge ports. 7.4.4 All joints, observation holes, explosion relief ports and cover plates should be well sealed. 7.4.5 The inner wall should be smooth and flat.
7.4.6 There should be no oil leakage when each component is working. 7.5 Corrugated sidewall belt conveyor ship unloader
7.5.1 An iron removal device should be installed at the junction of the feeder and the vertical lifting. 7.5.2 All supporting bearings, rollers and other rotating parts on the conveyor should be equipped with a centralized lubrication device. 7.5.3 The corrugated belt and its cover belt should be equipped with a safety device to prevent the belt from slipping (stalling) and deviation, and can automatically alarm and stop when the limit is exceeded. 7.6 Bucket elevator
7.6.1 A low-speed bucket elevator with a belt speed of less than 2.5m/s should be used. 7.6.2 An observation door (hole) should be provided to facilitate observation at any time, adjust the belt tension and correct deviation. 7.6.3 Explosion vents should be set at the bottom and top according to the requirements of GB/T15605. 7.6.4 Avoid direct connection with the top conveyor, and take measures such as explosion-proof and explosion-proof. 7.6.5 The inner wall should be flat and smooth.
The bearings of the rotating parts should be designed outside the machine body. It should be equipped with anti-slip and over-limit alarm and parking devices. 7. 6.7
7.6.8 When the motor power of the drive device is greater than 15kWh, a hydraulic coupling should be used for connection. 7.7 The main belt air chamber, cover belt air chamber and horizontal section air chamber of the belt hoist should be equipped with explosion vents according to GB/T15605. 7.7.13
7.7.2 The horizontal section should have a fully enclosed shell and should be made of non-combustible materials. 7.7.3 A safety device should be installed to prevent the belt from slipping (stalling) and deviation, which can automatically alarm and stop when the limit is exceeded. After stopping when it is overloaded, the grain on the belt should be cleaned up by slow rotation before it can be reset. 7.7.4
7.7.5 Rolling bearings should be used, and each bearing seat should be installed on the outside of the casing; the area around the bearing seat installed in the casing should be cleaned regularly. 7.7.6 Dust covers should be installed at the inlet and outlet. 7.7.7 The operation of the belt should be checked at any time during operation to prevent overheating of the belt due to side seal failure. 7.8 Chain conveyor
7.8.1 Wear-resistant and anti-static plastic guide plates should be used, and the guide plate joints should be aligned, with the left and right deviations not exceeding 1.5mm. 2 A chain break protection device should be equipped.
7.8.3 The drive device should be connected with a hydraulic coupling. 7.8.4 The drop (unloading) gate should use a pneumatic or manual gate. 7.8.5 There should be a material blocking prevention device at the tail end.
GB17918-1999
7.8.6 The drive should be designed for full-load starting, and its motor power should be greater than the full-load starting power. 7.8.7 The horizontal inclination angle of the feed (discharge) pipe should not be less than 45°. 7.8.8 All connection parts, observation holes, explosion vents and covers should be well sealed. 7.8.9 The bearings of the drive and driven parts should be designed outside the machine body. The inner wall should be flat and smooth.
7.8.11 There should be a closed shell.
Check the tension and the impact sound once a day before operation. If abnormal sound is found, stop the machine immediately for adjustment and repair. 7. 8. 12
7.9 Roller belt conveyor
7.9.1 The drive connection should be connected by a hydraulic coupling. It should be equipped with a safety monitoring device to prevent the belt from slipping and running off, and it can automatically alarm and stop when the limit is exceeded. 7.9.2
The conveying inclination angle should not be greater than 11; when the inclination angle is 11°~15°, a deep trough belt conveyor with a roller inclination angle of 40°~45° should be used. 7.9.3
The operation should be checked, and the machine should be stopped for inspection and adjustment in time if any abnormal sound or odor is found. 7.9.4
Air cushion belt conveyor
7.10.1 The material entrance should be equipped with a device to prevent debris from mixing into the grain. It is advisable to adopt a fully enclosed shell and should be made of non-combustible materials. 7. 10. 2
7.10.3 A safety device should be installed to prevent the belt from slipping (stalling) and running off, and it can automatically alarm and stop when the limit is exceeded. After stopping when it is overloaded, the grain on the belt should be cleaned up by slow rotation before it can be reset. 7. 10. 4
7.10.5 Rolling bearings should be used, and each bearing seat should be installed on the outside of the casing; the area around the bearing seat installed in the casing should be cleaned regularly. 7.10.6 Dust hoods should be installed on the inlet and outlet. 7.11 Ancillary equipment
7.11.1 Air compressor
a) It should be installed in an independent well-ventilated building; b) All valves should work normally during operation; c) The control cabinet and electrical components should be checked regularly to ensure that they work normally: d) Before starting the machine, all components and transmission devices should be checked to ensure that the whole machine is intact and the safety devices are effective. 7.11.2 The solenoid valve in the pneumatic operating device should be installed in a control box away from dust sources. 8 Weighing system
8.1 The inner walls of the weighing system, from the hopper on the scale to the discharge chute under the scale, where loose grain passes, should be flat and smooth. 8.2 The storage hopper on the scale should be equipped with explosion vents in accordance with GB/T15605. 8.3 All storage hoppers and scale bodies should be well sealed and dust-proof, and dust explosion-proof scales should be selected. 8.4 A cleaning system for each ship should be established for non-enclosed weighing systems. 8.5 Dust hoods should be installed for fully enclosed scales. 9 Dust removal system
9.1 Relatively independent dust removal systems should be set up in sections according to working conditions. 9.2 All bulk grain transfer points in the system (except for simple warehouses and room warehouses) should be equipped with dust hoods. 9.3 The design of the pipe network should consider anti-static measures and the inner wall of the explosion-proof air duct should be smooth. 9.4 The air volume should be strictly calculated so that the wind speed in the air duct is between 12 and 20m/s. 9.5 The installation, use and maintenance of the dust collector should be carried out in accordance with GB/T17919. 9.6 The dust removal system should be started before the operation and continue to run for more than 15 minutes after the operation stops. 7251 General Principles
7.1.1 Sealed continuous ship loading (unloading) machines and conveying equipment should be used. 7.1.2 The gates and valves in the system should be pneumatic. 7.1.3 The tapes used for various types of loading and unloading machinery and conveying equipment should be anti-static and flame-retardant tapes, and the tapes should not be combined with steel. 7.1.4 Ship loading (unloading) machines and conveying equipment should have emergency stop devices. 7.1.5 All ship loading (unloading) machines should have independent ventilation and dust removal devices. 723
7.2 Belt-type ship unloader
GB 17918--1999
7.2.1 The unloading chutes or pipes of each part should be sealed and made of non-combustible materials, and explosion vents should be installed on the top. 7.2.2 Dust removal measures should be taken at the parts where material drop occurs. 7.2.3 The lifting part and the horizontal conveying part should be equipped with safety devices to prevent the belt from slipping (stalling) and running off, and the alarm can be automatically stopped when the limit is exceeded.
7.2.4 When unloading bulk grain, the operation should be checked at any time to prevent the belt from overheating due to side seal and slide failure. 7.3 Screw ship unloader
7.3.1 The conveying part should be a fully enclosed shell with an explosion relief device. 7.3.2 The bearings should be sealed bearings.
7.4 Chain conveyor ship unloader
7.4.1 The conveying part should have a fully enclosed shell and should be made of non-combustible materials. 7.4.2 Wear-resistant and anti-static plastic guide plates should be used; the guide plate joints should be aligned, and the left and right deviations should not exceed 1.5mm. 7.4.3 Dust covers should be installed on the inlet and discharge ports. 7.4.4 All joints, observation holes, explosion relief ports and cover plates should be well sealed. 7.4.5 The inner wall should be smooth and flat.
7.4.6 There should be no oil leakage when each component is working. 7.5 Corrugated sidewall belt conveyor ship unloader
7.5.1 An iron removal device should be installed at the junction of the feeder and the vertical lifting. 7.5.2 All supporting bearings, rollers and other rotating parts on the conveyor should be equipped with a centralized lubrication device. 7.5.3 The corrugated belt and its cover belt should be equipped with a safety device to prevent the belt from slipping (stalling) and deviation, and can automatically alarm and stop when the limit is exceeded. 7.6 Bucket elevator
7.6.1 A low-speed bucket elevator with a belt speed of less than 2.5m/s should be used. 7.6.2 An observation door (hole) should be provided to facilitate observation at any time, adjust the belt tension and correct deviation. 7.6.3 Explosion vents should be set at the bottom and top according to the requirements of GB/T15605. 7.6.4 Avoid direct connection with the top conveyor, and take measures such as explosion-proof and explosion-proof. 7.6.5 The inner wall should be flat and smooth.
The bearings of the rotating parts should be designed outside the machine body. It should be equipped with anti-slip and over-limit alarm and parking devices. 7. 6.7
7.6.8 When the motor power of the drive device is greater than 15kWh, a hydraulic coupling should be used for connection. 7.7 The main belt air chamber, cover belt air chamber and horizontal section air chamber of the belt hoist should be equipped with explosion vents according to GB/T15605. 7.7.13
7.7.2 The horizontal section should have a fully enclosed shell and should be made of non-combustible materials. 7.7.3 A safety device should be installed to prevent the belt from slipping (stalling) and deviation, which can automatically alarm and stop when the limit is exceeded. After stopping when it is overloaded, the grain on the belt should be cleaned up by slow rotation before it can be reset. 7.7.4
7.7.5 Rolling bearings should be used, and each bearing seat should be installed on the outside of the casing; the area around the bearing seat installed in the casing should be cleaned regularly. 7.7.6 Dust covers should be installed at the inlet and outlet. 7.7.7 The operation of the belt should be checked at any time during operation to prevent overheating of the belt due to side seal failure. 7.8 Chain conveyor
7.8.1 Wear-resistant and anti-static plastic guide plates should be used, and the guide plate joints should be aligned, with the left and right deviations not exceeding 1.5mm. 2 A chain break protection device should be equipped.
7.8.3 The drive device should be connected with a hydraulic coupling. 7.8.4 The drop (unloading) gate should use a pneumatic or manual gate. 7.8.5 There should be a material blocking prevention device at the tail end.
GB17918-1999
7.8.6 The drive should be designed for full-load starting, and its motor power should be greater than the full-load starting power. 7.8.7 The horizontal inclination angle of the feed (discharge) pipe should not be less than 45°. 7.8.8 All connection parts, observation holes, explosion vents and covers should be well sealed. 7.8.9 The bearings of the drive and driven parts should be designed outside the machine body. The inner wall should be flat and smooth.
7.8.11 There should be a closed shell.
Check the tension and the impact sound once a day before operation. If abnormal sound is found, stop the machine immediately for adjustment and repair. 7. 8. 12
7.9 Roller belt conveyor
7.9.1 The drive connection should be connected by a hydraulic coupling. It should be equipped with a safety monitoring device to prevent the belt from slipping and running off, and it can automatically alarm and stop when the limit is exceeded. 7.9.2
The conveying inclination angle should not be greater than 11; when the inclination angle is 11°~15°, a deep trough belt conveyor with a roller inclination angle of 40°~45° should be used. 7.9.3
The operation should be checked, and the machine should be stopped for inspection and adjustment in time if any abnormal sound or odor is found. 7.9.4
Air cushion belt conveyor
7.10.1 The material entrance should be equipped with a device to prevent debris from mixing into the grain. It is advisable to adopt a fully enclosed shell and should be made of non-combustible materials. 7. 10. 2bZxz.net
7.10.3 A safety device should be installed to prevent the belt from slipping (stalling) and running off, and it can automatically alarm and stop when the limit is exceeded. After stopping when it is overloaded, the grain on the belt should be cleaned up by slow rotation before it can be reset. 7. 10. 4
7.10.5 Rolling bearings should be used, and each bearing seat should be installed on the outside of the casing; the area around the bearing seat installed in the casing should be cleaned regularly. 7.10.6 Dust hoods should be installed on the inlet and outlet. 7.11 Ancillary equipment
7.11.1 Air compressor
a) It should be installed in an independent well-ventilated building; b) All valves should work normally during operation; c) The control cabinet and electrical components should be checked regularly to ensure that they work normally: d) Before starting the machine, all components and transmission devices should be checked to ensure that the whole machine is intact and the safety devices are effective. 7.11.2 The solenoid valve in the pneumatic operating device should be installed in a control box away from dust sources. 8 Weighing system
8.1 The inner walls of the weighing system, from the hopper on the scale to the discharge chute under the scale, where loose grain passes, should be flat and smooth. 8.2 The storage hopper on the scale should be equipped with explosion vents in accordance with GB/T15605. 8.3 All storage hoppers and scale bodies should be well sealed and dust-proof, and dust explosion-proof scales should be selected. 8.4 A cleaning system for each ship should be established for non-enclosed weighing systems. 8.5 Dust hoods should be installed for fully enclosed scales. 9 Dust removal system
9.1 Relatively independent dust removal systems should be set up in sections according to working conditions. 9.2 All bulk grain transfer points in the system (except for simple warehouses and room warehouses) should be equipped with dust hoods. 9.3 The design of the pipe network should consider anti-static measures and the inner wall of the explosion-proof air duct should be smooth. 9.4 The air volume should be strictly calculated so that the wind speed in the air duct is between 12 and 20m/s. 9.5 The installation, use and maintenance of the dust collector should be carried out in accordance with GB/T17919. 9.6 The dust removal system should be started before the operation and continue to run for more than 15 minutes after the operation stops. 7251 General Principles
7.1.1 Sealed continuous ship loading (unloading) machines and conveying equipment should be used. 7.1.2 The gates and valves in the system should be pneumatic. 7.1.3 The tapes used for various types of loading and unloading machinery and conveying equipment should be anti-static and flame-retardant tapes, and the tapes should not be combined with steel. 7.1.4 Ship loading (unloading) machines and conveying equipment should have emergency stop devices. 7.1.5 All ship loading (unloading) machines should have independent ventilation and dust removal devices. 723
7.2 Belt-type ship unloader
GB 17918--1999
7.2.1 The unloading chutes or pipes of each part should be sealed and made of non-combustible materials, and explosion vents should be installed on the top. 7.2.2 Dust removal measures should be taken at the parts where material drop occurs. 7.2.3 The lifting part and the horizontal conveying part should be equipped with safety devices to prevent the belt from slipping (stalling) and running off, and the alarm can be automatically stopped when the limit is exceeded.
7.2.4 When unloading bulk grain, the operation should be checked at any time to prevent the belt from overheating due to side seal and slide failure. 7.3 Screw ship unloader
7.3.1 The conveying part should be a fully enclosed shell with an explosion relief device. 7.3.2 The bearings should be sealed bearings.
7.4 Chain conveyor ship unloader
7.4.1 The conveying part should have a fully enclosed shell and should be made of non-combustible materials. 7.4.2 Wear-resistant and anti-static plastic guide plates should be used; the guide plate joints should be aligned, and the left and right deviations should not exceed 1.5mm. 7.4.3 Dust covers should be installed on the inlet and discharge ports. 7.4.4 All joints, observation holes, explosion relief ports and cover plates should be well sealed. 7.4.5 The inner wall should be smooth and flat.
7.4.6 There should be no oil leakage when each component is working. 7.5 Corrugated sidewall belt conveyor ship unloader
7.5.1 An iron removal device should be installed at the junction of the feeder and the vertical lifting. 7.5.2 All supporting bearings, rollers and other rotating parts on the conveyor should be equipped with a centralized lubrication device. 7.5.3 The corrugated belt and its cover belt should be equipped with a safety device to prevent the belt from slipping (stalling) and deviation, and can automatically alarm and stop when the limit is exceeded. 7.6 Bucket elevator
7.6.1 A low-speed bucket elevator with a belt speed of less than 2.5m/s should be used. 7.6.2 An observation door (hole) should be provided to facilitate observation at any time, adjust the belt tension and correct deviation. 7.6.3 Explosion vents should be set at the bottom and top according to the requirements of GB/T15605. 7.6.4 Avoid direct connection with the top conveyor, and take measures such as explosion-proof and explosion-proof. 7.6.5 The inner wall should be flat and smooth.
The bearings of the rotating parts should be designed outside the machine body. It should be equipped with anti-slip and over-limit alarm and parking devices. 7. 6.7
7.6.8 When the motor power of the drive device is greater than 15kWh, a hydraulic coupling should be used for connection. 7.7 The main belt air chamber, cover belt air chamber and horizontal section air chamber of the belt hoist should be equipped with explosion vents according to GB/T15605. 7.7.13
7.7.2 The horizontal section should have a fully enclosed shell and should be made of non-combustible materials. 7.7.3 A safety device should be installed to prevent the belt from slipping (stalling) and deviation, which can automatically alarm and stop when the limit is exceeded. After stopping when it is overloaded, the grain on the belt should be cleaned up by slow rotation before it can be reset. 7.7.4
7.7.5 Rolling bearings should be used, and each bearing seat should be installed on the outside of the casing; the area around the bearing seat installed in the casing should be cleaned regularly. 7.7.6 Dust covers should be installed at the inlet and outlet. 7.7.7 The operation of the belt should be checked at any time during operation to prevent overheating of the belt due to side seal failure. 7.8 Chain conveyor
7.8.1 Wear-resistant and anti-static plastic guide plates should be used, and the guide plate joints should be aligned, with the left and right deviations not exceeding 1.5mm. 2 A chain break protection device should be equipped.
7.8.3 The drive device should be connected with a hydraulic coupling. 7.8.4 The drop (unloading) gate should use a pneumatic or manual gate. 7.8.5 There should be a material blocking prevention device at the tail end.
GB17918-1999
7.8.6 The drive should be designed for full-load starting, and its motor power should be greater than the full-load starting power. 7.8.7 The horizontal inclination angle of the feed (discharge) pipe should not be less than 45°. 7.8.8 All connection parts, observation holes, explosion vents and covers should be well sealed. 7.8.9 The bearings of the drive and driven parts should be designed outside the machine body. The inner wall should be flat and smooth.
7.8.11 There should be a closed shell.
Check the tension and the impact sound once a day before operation. If abnormal sound is found, stop the machine immediately for adjustment and repair. 7. 8. 12
7.9 Roller belt conveyor
7.9.1 The drive connection should be connected by a hydraulic coupling. It should be equipped with a safety monitoring device to prevent the belt from slipping and running off, and it can automatically alarm and stop when the limit is exceeded. 7.9.2
The conveying inclination angle should not be greater than 11; when the inclination angle is 11°~15°, a deep trough belt conveyor with a roller inclination angle of 40°~45° should be used. 7.9.3
The operation should be checked, and the machine should be stopped for inspection and adjustment in time if any abnormal sound or odor is found. 7.9.4
Air cushion belt conveyor
7.10.1 The material entrance should be equipped with a device to prevent debris from mixing into the grain. It is advisable to adopt a fully enclosed shell and should be made of non-combustible materials. 7. 10. 2
7.10.3 A safety device should be installed to prevent the belt from slipping (stalling) and running off, and it can automatically alarm and stop when the limit is exceeded. After stopping when it is overloaded, the grain on the belt should be cleaned up by slow rotation before it can be reset. 7. 10. 4
7.10.5 Rolling bearings should be used, and each bearing seat should be installed on the outside of the casing; the area around the bearing seat installed in the casing should be cleaned regularly. 7.10.6 Dust hoods should be installed on the inlet and outlet. 7.11 Ancillary equipment
7.11.1 Air compressor
a) It should be installed in an independent well-ventilated building; b) All valves should work normally during operation; c) The control cabinet and electrical components should be checked regularly to ensure that they work normally: d) Before starting the machine, all components and transmission devices should be checked to ensure that the whole machine is intact and the safety devices are effective. 7.11.2 The solenoid valve in the pneumatic operating device should be installed in a control box away from dust sources. 8 Weighing system
8.1 The inner walls of the weighing system, from the hopper on the scale to the discharge chute under the scale, where loose grain passes, should be flat and smooth. 8.2 The storage hopper on the scale should be equipped with explosion vents in accordance with GB/T15605. 8.3 All storage hoppers and scale bodies should be well sealed and dust-proof, and dust explosion-proof scales should be selected. 8.4 A cleaning system for each ship should be established for non-enclosed weighing systems. 8.5 Dust hoods should be installed for fully enclosed scales. 9 Dust removal system
9.1 Relatively independent dust removal systems should be set up in sections according to working conditions. 9.2 All bulk grain transfer points in the system (except for simple warehouses and room warehouses) should be equipped with dust hoods. 9.3 The design of the pipe network should consider anti-static measures and the inner wall of the explosion-proof air duct should be smooth. 9.4 The air volume should be strictly calculated so that the wind speed in the air duct is between 12 and 20m/s. 9.5 The installation, use and maintenance of the dust collector should be carried out in accordance with GB/T17919. 9.6 The dust removal system should be started before the operation and continue to run for more than 15 minutes after the operation stops. 7255 The inner wall should be smooth and flat.
7.4.6 There should be no oil leakage when each component is working. 7.5 Corrugated sidewall belt conveyor unloader
7.5.1 An iron removal device should be installed at the junction of the feeder and the vertical lifting. 7.5.2 All supporting bearings, rollers and other rotating parts on the conveyor should be equipped with a centralized lubrication device. 7.5.3 The corrugated belt and its cover belt should be equipped with a safety device to prevent the belt from slipping (stalling) and deviation, and can automatically alarm and stop when the limit is exceeded. 7.6 Bucket elevator
7.6.1 A low-speed bucket elevator with a belt speed of less than 2.5m/s should be used. 7.6.2 An observation door (hole) should be provided to observe at any time, adjust the belt tension and correct deviation. 7.6.3 Explosion vents should be set at the bottom and top according to the requirements of GB/T15605. 7.6.4 Avoid direct connection with the top conveyor, and take measures such as explosion-proof and explosion-proof. 7.6.5 The inner wall should be flat and smooth.
The bearings of the rotating parts should be designed outside the machine body. It should be equipped with anti-slip and over-limit alarm and parking devices. 7. 6.7
7.6.8 When the motor power of the drive device is greater than 15kWh, a hydraulic coupling should be used for connection. 7.7 The main belt air chamber, cover belt air chamber and horizontal section air chamber of the belt hoist should be equipped with explosion vents according to GB/T15605. 7.7.13
7.7.2 The horizontal section should have a fully enclosed shell and should be made of non-combustible materials. 7.7.3 A safety device should be installed to prevent the belt from slipping (stalling) and deviation, which can automatically alarm and stop when the limit is exceeded. After stopping when it is overloaded, the grain on the belt should be cleaned up by slow rotation before it can be reset. 7.7.4
7.7.5 Rolling bearings should be used, and each bearing seat should be installed on the outside of the casing; the area around the bearing seat installed in the casing should be cleaned regularly. 7.7.6 Dust covers should be installed at the inlet and outlet. 7.7.7 The operation of the belt should be checked at any time during operation to prevent overheating of the belt due to side seal failure. 7.8 Chain conveyor
7.8.1 Wear-resistant and anti-static plastic guide plates should be used, and the guide plate joints should be aligned, with the left and right deviations not exceeding 1.5mm. 2 A chain break protection device should be equipped.
7.8.3 The drive device should be connected with a hydraulic coupling. 7.8.4 The drop (unloading) gate should use a pneumatic or manual gate. 7.8.5 There should be a material blocking prevention device at the tail end.
GB17918-1999
7.8.6 The drive should be designed for full-load starting, and its motor power should be greater than the full-load starting power. 7.8.7 The horizontal inclination angle of the feed (discharge) pipe should not be less than 45°. 7.8.8 All connection parts, observation holes, explosion vents and covers should be well sealed. 7.8.9 The bearings of the drive and driven parts should be designed outside the machine body. The inner wall should be flat and smooth.
7.8.11 There should be a closed shell.
Check the tension and the impact sound once a day before operation. If abnormal sound is found, stop the machine immediately for adjustment and repair. 7. 8. 12
7.9 Roller belt conveyor
7.9.1 The drive connection should be connected by a hydraulic coupling. It should be equipped with a safety monitoring device to prevent the belt from slipping and running off, and it can automatically alarm and stop when the limit is exceeded. 7.9.2
The conveying inclination angle should not be greater than 11; when the inclination angle is 11°~15°, a deep trough belt conveyor with a roller inclination angle of 40°~45° should be used. 7.9.3
The operation should be checked, and the machine should be stopped for inspection and adjustment in time if any abnormal sound or odor is found. 7.9.4
Air cushion belt conveyor
7.10.1 The material entrance should be equipped with a device to prevent debris from mixing into the grain. It is advisable to adopt a fully enclosed shell and should be made of non-combustible materials. 7. 10. 2
7.10.3 A safety device should be installed to prevent the belt from slipping (stalling) and running off, and it can automatically alarm and stop when the limit is exceeded. After stopping when it is overloaded, the grain on the belt should be cleaned up by slow rotation before it can be reset. 7. 10. 4
7.10.5 Rolling bearings should be used, and each bearing seat should be installed on the outside of the casing; the area around the bearing seat installed in the casing should be cleaned regularly. 7.10.6 Dust hoods should be installed on the inlet and outlet. 7.11 Ancillary equipment
7.11.1 Air compressor
a) It should be installed in an independent well-ventilated building; b) All valves should work normally during operation; c) The control cabinet and electrical components should be checked regularly to ensure that they work normally: d) Before starting the machine, all its components and transmission devices should be checked to ensure that the whole machine is intact and the safety devices are effective. 7.11.2 The solenoid valve in the pneumatic control device should be installed in a control box away from dust sources. 8 Weighing system
8.1 The inner walls of the weighing system, from the hopper on the scale to the discharge chute under the scale, where loose grain passes, should be flat and smooth. 8.2 The storage hopper on the scale should be equipped with explosion vents in accordance with GB/T15605. 8.3 All storage hoppers and scale bodies should be well sealed and dust-proof, and dust explosion-proof scales should be selected. 8.4 A cleaning system for each ship should be established for non-enclosed weighing systems. 8.5 Dust hoods should be installed for fully enclosed scales. 9 Dust removal system
9.1 Relatively independent dust removal systems should be set up in sections according to working conditions. 9.2 All bulk grain transfer points in the system (except for simple warehouses and room warehouses) should be equipped with dust hoods. 9.3 The design of the pipe network should consider anti-static measures and the inner wall of the explosion-proof air duct should be smooth. 9.4 The air volume should be strictly calculated so that the wind speed in the air duct is between 12 and 20m/s. 9.5 The installation, use and maintenance of the dust collector should be carried out in accordance with GB/T17919. 9.6 The dust removal system should be started before the operation and continue to run for more than 15 minutes after the operation stops. 7255 The inner wall should be smooth and flat.
7.4.6 There should be no oil leakage when each component is working. 7.5 Corrugated sidewall belt conveyor unloader
7.5.1 An iron removal device should be installed at the junction of the feeder and the vertical lifting. 7.5.2 All supporting bearings, rollers and other rotating parts on the conveyor should be equipped with a centralized lubrication device. 7.5.3 The corrugated belt and its cover belt should be equipped with a safety device to prevent the belt from slipping (stalling) and deviation, and can automatically alarm and stop when the limit is exceeded. 7.6 Bucket elevator
7.6.1 A low-speed bucket elevator with a belt speed of less than 2.5m/s should be used. 7.6.2 An observation door (hole) should be provided to observe at any time, adjust the belt tension and correct deviation. 7.6.3 Explosion vents should be set at the bottom and top according to the requirements of GB/T15605. 7.6.4 Avoid direct connection with the top conveyor, and take measures such as explosion-proof and explosion-proof. 7.6.5 The inner wall should be flat and smooth.
The bearings of the rotating parts should be designed outside the machine body. It should be equipped with anti-slip and over-limit alarm and parking devices. 7. 6.7
7.6.8 When the motor power of the drive device is greater than 15kWh, a hydraulic coupling should be used for connection. 7.7 The main belt air chamber, cover belt air chamber and horizontal section air chamber of the belt hoist should be equipped with explosion vents according to GB/T15605. 7.7.13
7.7.2 The horizontal section should have a fully enclosed shell and should be made of non-combustible materials. 7.7.3 A safety device should be installed to prevent the belt from slipping (stalling) and deviation, which can automatically alarm and stop when the limit is exceeded. After stopping when it is overloaded, the grain on the belt should be cleaned up by slow rotation before it can be reset. 7.7.4
7.7.5 Rolling bearings should be used, and each bearing seat should be installed on the outside of the casing; the area around the bearing seat installed in the casing should be cleaned regularly. 7.7.6 Dust covers should be installed at the inlet and outlet. 7.7.7 The operation of the belt should be checked at any time during operation to prevent overheating of the belt due to side seal failure. 7.8 Chain conveyor
7.8.1 Wear-resistant and anti-static plastic guide plates should be used, and the guide plate joints should be aligned, with the left and right deviations not exceeding 1.5mm. 2 A chain break protection device should be equipped.
7.8.3 The drive device should be connected with a hydraulic coupling. 7.8.4 The drop (unloading) gate should use a pneumatic or manual gate. 7.8.5 There should be a material blocking prevention device at the tail end.
GB17918-1999
7.8.6 The drive should be designed for full-load starting, and its motor power should be greater than the full-load starting power. 7.8.7 The horizontal inclination angle of the feed (discharge) pipe should not be less than 45°. 7.8.8 All connection parts, observation holes, explosion vents and covers should be well sealed. 7.8.9 The bearings of the drive and driven parts should be designed outside the machine body. The inner wall should be flat and smooth.
7.8.11 There should be a closed shell.
Check the tension and the impact sound once a day before operation. If abnormal sound is found, stop the machine immediately for adjustment and repair. 7. 8. 12
7.9 Roller belt conveyor
7.9.1 The drive connection should be connected by a hydraulic coupling. It should be equipped with a safety monitoring device to prevent the belt from slipping and running off, and it can automatically alarm and stop when the limit is exceeded. 7.9.2
The conveying inclination angle should not be greater than 11; when the inclination angle is 11°~15°, a deep trough belt conveyor with a roller inclination angle of 40°~45° should be used. 7.9.3
The operation should be checked, and the machine should be stopped for inspection and adjustment in time if any abnormal sound or odor is found. 7.9.4
Air cushion belt conveyor
7.10.1 The material entrance should be equipped with a device to prevent debris from mixing into the grain. It is advisable to adopt a fully enclosed shell and should be made of non-combustible materials. 7. 10. 2
7.10.3 A safety device should be installed to prevent the belt from slipping (stalling) and running off, and it can automatically alarm and stop when the limit is exceeded. After stopping when it is overloaded, the grain on the belt should be cleaned up by slow rotation before it can be reset. 7. 10. 4
7.10.5 Rolling bearings should be used, and each bearing seat should be installed on the outside of the casing; the area around the bearing seat installed in the casing should be cleaned regularly. 7.10.6 Dust hoods should be installed on the inlet and outlet. 7.11 Ancillary equipment
7.11.1 Air compressor
a) It should be installed in an independent well-ventilated building; b) All valves should work normally during operation; c) The control cabinet and electrical components should be checked regularly to ensure that they work normally: d) Before starting the machine, all components and transmission devices should be checked to ensure that the whole machine is intact and the safety devices are effective. 7.11.2 The solenoid valve in the pneumatic operating device should be installed in a control box away from dust sources. 8 Weighing system
8.1 The inner walls of the weighing system, from the hopper on the scale to the discharge chute under the scale, where loose grain passes, should be flat and smooth. 8.2 The storage hopper on the scale should be equipped with explosion vents in accordance with GB/T15605. 8.3 All storage hoppers and scale bodies should be well sealed and dust-proof, and dust explosion-proof scales should be selected. 8.4 A cleaning system for each ship should be established for non-enclosed weighing systems. 8.5 Dust hoods should be installed for fully enclosed scales. 9 Dust removal system
9.1 Relatively independent dust removal systems should be set up in sections according to working conditions. 9.2 All bulk grain transfer points in the system (except for simple warehouses and room warehouses) should be equipped with dust hoods. 9.3 The design of the pipe network should consider anti-static measures and the inner wall of the explosion-proof air duct should be smooth. 9.4 The air volume should be strictly calculated so that the wind speed in the air duct is between 12 and 20m/s. 9.5 The installation, use and maintenance of the dust collector should be carried out in accordance with GB/T17919. 9.6 The dust removal system should be started before the operation and continue to run for more than 15 minutes after the operation stops. 7252
The conveying inclination angle should not be greater than 11; when the inclination angle is 11°~15°, a deep trough belt conveyor with a roller inclination angle of 40°~45° is suitable. 7.9.3
The operation should be checked, and the machine should be stopped for inspection and adjustment in time if any abnormal sound or odor is found. 7.9.4
Air cushion belt conveyor
7.10.1 The material entrance should be equipped with a device to prevent debris from mixing into the grain. It is advisable to adopt a fully enclosed shell and should be made of non-combustible materials. 7. 10. 2
7.10.3 A safety device should be installed to prevent the belt from slipping (stalling) and running off, and it can automatically alarm and stop when the limit is exceeded. After stopping when it is overloaded, the grain on the belt should be cleaned up by slow rotation before it can be reset. 7. 10. 4
7.10.5 Rolling bearings should be used, and each bearing seat should be installed on the outside of the casing; the area around the bearing seat installed in the casing should be cleaned regularly. 7.10.6 Dust hoods should be installed on the inlet and outlet. 7.11 Ancillary equipment
7.11.1 Air compressor
a) It should be installed in an independent well-ventilated building; b) All valves should work normally during operation; c) The control cabinet and electrical components should be checked regularly to ensure that they work normally: d) Before starting the machine, all components and transmission devices should be checked to ensure that the whole machine is intact and the safety devices are effective. 7.11.2 The solenoid valve in the pneumatic operating device should be installed in a control box away from dust sources. 8 Weighing system
8.1 The inner walls of the weighing system, from the hopper on the scale to the discharge chute under the scale, where loose grain passes, should be flat and smooth. 8.2 The storage hopper on the scale should be equipped with explosion vents in accordance with GB/T15605. 8.3 All storage hoppers and scale bodies should be well sealed and dust-proof, and dust explosion-proof scales should be selected. 8.4 A cleaning system for each ship should be established for non-enclosed weighing systems. 8.5 Dust hoods should be installed for fully enclosed scales. 9 Dust removal system
9.1 Relatively independent dust removal systems should be set up in sections according to working conditions. 9.2 All bulk grain transfer points in the system (except for simple warehouses and room warehouses) should be equipped with dust hoods. 9.3 The design of the pipe network should consider anti-static measures and the inner wall of the explosion-proof air duct should be smooth. 9.4 The air volume should be strictly calculated so that the wind speed in the air duct is between 12 and 20m/s. 9.5 The installation, use and maintenance of the dust collector should be carried out in accordance with GB/T17919. 9.6 The dust removal system should be started before the operation and continue to run for more than 15 minutes after the operation stops. 7252
The conveying inclination angle should not be greater than 11; when the inclination angle is 11°~15°, a deep trough belt conveyor with a roller inclination angle of 40°~45° is suitable. 7.9.3
The operation should be checked, and the machine should be stopped for inspection and adjustment in time if any abnormal sound or odor is found. 7.9.4
Air cushion belt conveyor
7.10.1 The material entrance should be equipped with a device to prevent debris from mixing into the grain. It is advisable to adopt a fully enclosed shell and should be made of non-combustible materials. 7. 10. 2
7.10.3 A safety device should be installed to prevent the belt from slipping (stalling) and running off, and it can automatically alarm and stop when the limit is exceeded. After stopping when it is overloaded, the grain on the belt should be cleaned up by slow rotation before it can be reset. 7. 10. 4
7.10.5 Rolling bearings should be used, and each bearing seat should be installed on the outside of the casing; the area around the bearing seat installed in the casing should be cleaned regularly. 7.10.6 Dust hoods should be installed on the inlet and outlet. 7.11 Ancillary equipment
7.11.1 Air compressor
a) It should be installed in an independent well-ventilated building; b) All valves should work normally during operation; c) The control cabinet and electrical components should be checked regularly to ensure that they work normally: d) Before starting the machine, all components and transmission devices should be checked to ensure that the whole machine is intact and the safety devices are effective. 7.11.2 The solenoid valve in the pneumatic operating device should be installed in a control box away from dust sources. 8 Weighing system
8.1 The inner walls of the weighing system, from the hopper on the scale to the discharge chute under the scale, where loose grain passes, should be flat and smooth. 8.2 The storage hopper on the scale should be equipped with explosion vents in accordance with GB/T15605. 8.3 All storage hoppers and scale bodies should be well sealed and dust-proof, and dust explosion-proof scales should be selected. 8.4 A cleaning system for each ship should be established for non-enclosed weighing systems. 8.5 Dust hoods should be installed for fully enclosed scales. 9 Dust removal system
9.1 Relatively independent dust removal systems should be set up in sections according to working conditions. 9.2 All bulk grain transfer points in the system (except for simple warehouses and room warehouses) should be equipped with dust hoods. 9.3 The design of the pipe network should consider anti-static measures and the inner wall of the explosion-proof air duct should be smooth. 9.4 The air volume should be strictly calculated so that the wind speed in the air duct is between 12 and 20m/s. 9.5 The installation, use and maintenance of the dust collector should be carried out in accordance with GB/T17919. 9.6 The dust removal system should be started before the operation and continue to run for more than 15 minutes after the operation stops. 725
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