Some standard content:
JB/T8907—1999
This standard adopts IS08306:1985 "Bridge and gantry cranes: Crane and track tolerances" and ISO4310:1981 "Crane test specifications and methods" in a non-equivalent manner.
Appendix A of this standard is a reminder appendix.
This standard is proposed and managed by the National Technical Committee for Standardization of Hoisting Machinery. The responsible drafting units of this standard are: Shandong Crane Factory and Beijing Hoisting and Transportation Machinery Research Institute. The participating drafting units of this standard are: Kunming Heavy Machinery Factory. The main drafters of this standard are: Cui Zhenyuan, Wang Yong, Zhou Sixhen, Wang Fengshun, Zhou Fen. This standard was first issued on June 28, 1999. 365
1 Scope
Machinery Industry Standard of the People's Republic of China
Technical Conditions
Insulated Overhead Travelling Cranes
Specirication for Insulated Overhead Travelling CranesJB/T 8907--- 1999
This standard specifies the technical requirements, test methods, inspection rules, etc. for insulated overhead travelling cranes (hereinafter referred to as cranes). This standard is mainly applicable to cranes working in the smelting workshop environment of non-ferrous metal electrolytic aluminum, magnesium, lead, zinc, etc., and its working level is A5~A7. The picking device is a hook or a special lifting device. It can also be used as a reference for special insulated cranes working in other environments. 2 Referenced Standards
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 the parties using this standard should explore the possibility of using the latest version of the following standards. GB191-1990 Pictorial signs for packaging, storage and transportation
GB/T1303—19773240 Oxygen-free phenolic laminated glass cloth boardGB/T 3811—1983
Crane design specifications
Crane test specifications and procedures
GB/T 5905-1986
GB/T 10183 -1988
Tolerances for manufacturing and track installation of bridge and gantry cranesGB/T13384-1992
General technical conditions for packaging of electromechanical products
GB/T 14405- - 1993
General purpose bridge cranes
GB/T 14407 -1993
JB/T 7685.2—1995
IEC 1212-3-2:1995
3 Technical requirements
General bridge and gantry crane cab
Technical conditions for electromagnetic block brakes
Thermosetting resin industrial hard round laminated tubes and rods for electrical appliances The design and manufacture of cranes shall comply with the relevant provisions of GB/T3811 and this standard. 3.1 Environmental conditions
3.1.1 The power supply of the crane is two-phase AC. The frequency is 50Hz and the voltage is 380V. The upper limit of the allowable voltage fluctuation on the motor and electrical appliances is 10% of the rated voltage, and the lower limit (at peak current) is 15% of the rated voltage. The internal voltage loss of the crane shall comply with the provisions of GB/T3811.
3.1.2 The installation of the crane running track shall comply with the requirements of GB/T10183. 3.1.3 The altitude of the crane installation and use site shall not exceed 2000m (the motor capacity should be checked when it exceeds 1000m). 3.1.4 There shall be no flammable or explosive gas in the working environment. 3.1.5 The radiant heat temperature of the hoisted objects on the crane sling shall not exceed 300C. 3.1.6 Climatic conditions for normal operation of the crane: a) Ambient temperature is -5C to +50C; b) Relative humidity does not exceed 50% at 1050 hours Approved by the State Bureau of Machinery Industry on June 28, 1999 366 Implementation on January 1, 2000 3.2 Performance in use JB/T8907--1999 3.2.1 The lifting capacity of the crane shall reach the rated lifting capacity. For hook cranes, it refers to the total weight of the objects lifted below the hook; for special sling cranes, it refers to the total weight of the special sling and the weight of the objects lifted. 3.2.2 For hook cranes, the braking distance of the hoisted object during the descending brake (the distance from the brake power failure to the stop of the heavy object after the controller is stably running at the lowest descending speed and pulled back to zero position) should not be greater than 1/65 of the stable lifting distance within 1 minute. 3.2.3 When the user has special requirements for the braking stability of the crane, the electric braking method should be adopted. Ensure that when descending within the range of 0.2~1.0G. (G,-rated lifting weight), the motor speed before braking drops to less than 1/3 of the synchronous speed, and this speed should be able to operate stably.
3.2.4 For double trolley cranes, the operation of the same mechanism of the two trolleys should be able to be linked or started separately. 3.2.5 The static rigidity of the crane is stipulated as follows: when the fully loaded trolley is located in the middle of the span, the vertical static deflection caused by the static load of the trolley in the middle of the span of the bridge (main beam) should be ≤S/800 (S-crane span). 3.2.6 The dynamic rigidity of the crane is stipulated as follows: when the trolley is located in the middle of the span, the full-load natural frequency of the crane should be ≥2Hz. The verification is only carried out when the user or the design itself has requirements for this. 3.2.7 The crane should be equipped with three insulations (hook and pulley, lifting mechanism and trolley frame, trolley frame and trolley). The resistance value of each insulation measured by a 1000V megohmmeter at normal temperature (temperature 20~25C, relative humidity ≤85%) should be ≥1MQ. 3.2.8 When the crane is not in working state, the induced voltage on the trolley frame should not exceed the safe voltage value (36V). 3.3 Insulation material
It is recommended to give priority to epoxy phenolic laminated glass cloth board as the insulation material, and its performance should not be lower than the provisions of GB/T1303. It is recommended to give priority to the use of industrial hard round laminated tubes and rods of thermosetting resin for electrical appliances as insulation materials. Its performance should not be lower than the provisions of IEC1212-3-2.
3.4 Brakes
The lifting mechanism of the crane should be equipped with double brakes. It is recommended to use the electromagnetic block brake in JB/T7685.2. The safety factor of each brake is ≥1.25.
3.5 Driver's Cab
The driver's cab of the crane is recommended to use the insulated driver's cab in GB/T14407. In order to ensure that the driver has good working conditions, cooling equipment can be installed in the driver's cab according to user needs. In order to prevent corrosive gases from corroding the glass and affecting the driver's sight, the driver's cab should be equipped with replaceable glass or organic glass. 3.6 Crane Tolerances
The manufacturing and assembly requirements of the crane shall comply with the relevant provisions of 4.3 to 4.7 in GB/T14405-1993. 3.7 Electrical Equipment
The electrical equipment of the crane shall comply with the relevant provisions of 4.8 in GB/T14405-1993. 3.8 Safety and Health
The safety and health of the crane shall comply with the relevant provisions of 4.9 of GB/T14405--1993. 3.9 Appearance
The appearance of the crane shall comply with the relevant provisions of 4.10 of GB/T14405--1993. 4 Test Methods
The crane test shall be carried out in accordance with the procedures specified in GB/T5905. 4.1 Visual Inspection
The visual inspection shall include whether the specifications and (or) status of all important parts meet the requirements. Such as: various mechanisms, electrical equipment, safety devices, brakes, controllers, lighting and signal systems: crane metal structure and its connections, ladders, passages, driver's cab and walkways; all protective devices; hooks or other retrieval devices and connectors; wire ropes and their fixings; pulley blocks and their axial fasteners. During the inspection, it is not necessary to disassemble any parts, but the covers that should be opened during normal maintenance and inspection should be opened, such as the limit switch cover. 367
4.2 Qualification test
JB/T8907--1999
4.2.1 After 2~3 times of gradual loading until the rated lifting capacity is reached, conduct action tests and tests in all directions at standard voltage and rated speed of the motor to verify whether the items listed in Table 1 comply with the requirements of the design drawings and this standard. Table 1
Test load
Project name
Lifting height (or lifting range)
Limit position of picking device
Load lifting speed
Load lowering speed
Crane and trolley running speed
Braking distance of load lowering
Before load lowering braking, motor speed drops Static rigidity of crane (measure static deflection in the middle of main beam span) Dynamic rigidity of crane (measure self-vibration rate in the middle of main beam span during rated load lowering braking)
Resistance value between three insulations (hook and pulley, lifting mechanism and trolley frame, trolley frame and trolley)
Crane noise
Reliability of limiter
Induced voltage of trolley frame
Static load test
The purpose of static load test is to test the structural bearing capacity of crane and its components. Unit of measurement
Rated lifting capacity
See design drawing
Can stop accurately
Limit deviation
The static load test of each lifting mechanism should be carried out separately, but for the crane with double trolleys, the main hooks of the two trolleys should be carried out at the same time, so as to test the bearing capacity of the bridge frame at the same time.
Before the static load test of the main hook, the unloaded trolley should be parked in the middle of the span and the reference point should be determined. The lifting mechanism should be loaded gradually at 1.25G without impact, and the lifting height should be 100~～~200mm from the ground, and the suspension time should be not less than 10min. After unloading the load, check whether there is permanent deformation at the base point of the crane main beam. Repeat for the third time, and there should be no permanent deformation. Drive the trolley to the end of the span and check that the actual camber of the main beam should be ≥0.7S/1000. After the test, if there are no cracks, permanent deformation, paint peeling or damage that affects the performance and safety of the crane, and there is no looseness or damage at the connection, the test result is considered to be qualified. 4.2.3 Dynamic load test
The purpose of the dynamic load test is mainly to verify the functions of the various mechanisms and brakes of the crane. The dynamic load test of each mechanism of the crane should be carried out separately first, and then the joint action test should be carried out, and the two mechanisms should be started at the same time (but the main and auxiliary lifting mechanisms should not be started at the same time).
The lifting mechanism is loaded at 1.1G. During the test, each action should be started and braked repeatedly within its entire range of motion. When the suspended test load is started in the air, the test load should not have reverse action. During the test, an intermittent time for operation should be left according to the continuous power-on rate of the motor of the machine, and control should be carried out according to the operating procedures. It must be noted that the acceleration, deceleration and speed must be limited within the normal working range of the crane. According to its working cycle, the test time should last at least 1 hour. If each component can complete its functional test, and no damage to the mechanism or components is found in the subsequent visual inspection, and no looseness or damage is found in the connection, then the test result is considered to be qualified. 5 Inspection rules
5.1 Factory inspection
5.1.1 Each crane should be inspected for delivery, and the inspection content includes all items except Chapter 4 and Chapter 7 of this standard. 5.1.2 The crane should be pre-installed at the manufacturer. During pre-installation, the driver's cab of the bridge part may not be installed, the wire rope and the picking device of the trolley part may not be tied, and the running wheels should be suspended. 5.1.3 Carry out an empty running test, start each mechanism separately, and run it in the forward and reverse directions. The cumulative time of the test is ≥5min. 5.1.4 The quality inspection department of the manufacturer shall conduct item-by-item inspection according to the product drawings and this standard. Only after the inspection is qualified will it be accepted and the "Product Qualification Certificate" will be issued to the user. 5.2 Type inspection
5.2.1 Type inspection should generally be carried out in any of the following situations: a) Trial design and identification of new products or old products transferred to the factory for production; b) After formal production, if there are major changes in structure, materials, and processes that may affect the performance of the crane; c) When the product is discontinued for more than 2 years and production is resumed; d) When the factory inspection results are significantly different from the last type inspection; e) When the national quality supervision agency proposes a requirement for type inspection. 5.2.2 The content of type inspection is based on the factory inspection plus the test content specified in Chapter 4. 5.2.3 If the manufacturer does not have the test conditions, the type test should be carried out personally at the user's site. 5.2.4 Type test shall be carried out by random sampling at the manufacturer, and the sampling quantity shall be 1 unit. 6 Marking, packaging, transportation and storage
6.1 Crane marking
6.1.1 An obvious crane tonnage plate shall be set outside the mid-span of the crane main beam, and the tonnage plate shall indicate: a) rated lifting capacity;
b) manufacturer’s name and factory logo, trademark (if any); 6.1.2 A crane sign shall be installed in a conspicuous position in the crane driver’s cab, and the following shall be indicated on the sign: a) crane name;
b) crane main performance parameters;
c) crane model or mark;
d) manufacturing date and production number;
e) manufacturer’s name
6.2 Packaging, transportation, storage
6.2.1 The packaging, transportation and storage of cranes shall comply with the relevant provisions of GB191 and GB/T13384. 6.2.2 The following documents should be placed in the first packing box of the crane: a) Crane qualification certificate;
b) Crane operation and maintenance instructions (including the instructions of the purchased electrical equipment); c) Packing list;
d) Other relevant technical documents.
6.2.3 During the transportation and storage of the crane, effective rain and moisture-proof measures must be taken for the insulation part of the crane. 369
Quality guarantee period
JB/T 8907
The manufacturer shall ensure that the supplied crane can work normally within 12 months from the date of use, but not more than 18 months from the date of delivery, under the condition of proper storage, reasonable installation and correct use by the user. 370
JB/T89071999
Appendix A
(Appendix of tips)
Maintenance and maintenance of cranes
Before each shift, use compressed air to blow away the dust splashed on the crane trolley and lifting mechanism. A1
Before each shift, measure the insulation resistance value of the insulating parts to see if it meets the requirements of 3.2.7, otherwise the machine shall not be started. A2
According to the frequency of use or when the insulation resistance value drops below the standard value, the insulating parts of each insulating part shall be replaced in time. A3
Before formal work, check whether the action of the brake is sensitive, safe and reliable. A4
A5When the crane is lifting heavy objects whose length exceeds the width of two rows of electrolytic cells, special protective measures shall be taken to avoid equipment and personal accidents caused by electric shock.1G, loading, during the test, each action should be started and braked repeatedly within its entire range of motion. When the suspended test load is started in the air, the test load should not have reverse movement. During the test, the operation interval should be left according to the motor power-on duration of the machine, and the control should be carried out according to the operating procedures. It must be noted that the acceleration, deceleration and speed must be limited to the normal working range of the crane. According to its working cycle, the test time should last at least 1 hour. If each component can complete its functional test and no damage to the mechanism or component is found in the subsequent visual inspection, and no looseness or damage is found in the connection, the test result is considered to be qualified. 5 Inspection rules
5.1 Factory inspectionWww.bzxZ.net
5.1.1 Each crane should be inspected before delivery, and the inspection content includes all items except Chapter 4 and Chapter 7 of this standard. 5.1.2 The crane should be pre-assembled at the manufacturer\. During pre-installation, the cab of the bridge part may not be installed, the wire rope and the picking device of the trolley part may not be tied, and the running wheels should be suspended. 5.1.3 Carry out an empty running test, start each mechanism separately, and run it in the forward and reverse directions. The cumulative test time is ≥5min. 5.1.4 The quality inspection department of the manufacturer shall conduct item-by-item inspection according to the product drawings and this standard. Only after the inspection is qualified will it be allowed to be accepted, and a "Product Qualification Certificate" shall be issued to the user. 5.2 Type inspection
5.2.1 Type inspection should generally be carried out in any of the following situations: a) Trial determination and identification of new products or old products transferred to the factory for production; b) After formal production, if there are major changes in structure, materials, and processes that may affect the performance of the crane; c) When the product has been discontinued for more than 2 years and production is resumed; d) When the factory inspection results are significantly different from the last type inspection; e) When the national quality supervision agency proposes a requirement for type inspection. 5.2.2 The content of type inspection is the test content specified in Chapter 4 in addition to the factory inspection. 5.2.3 If the manufacturer does not have the test conditions, the type test should be carried out at the user's site. 5.2.4 Type test shall be carried out by random sampling at the manufacturer, and the sampling quantity shall be 1 unit. 6 Marking, packaging, transportation and storage
6.1 Crane marking
6.1.1 An obvious crane tonnage plate shall be set outside the mid-span of the crane main beam, and the tonnage plate shall indicate: a) rated lifting capacity;
b) manufacturer’s name and factory logo, trademark (if any); 6.1.2 A crane sign shall be installed in a conspicuous position in the crane driver’s cab, and the following shall be indicated on the sign: a) crane name;
b) crane main performance parameters;
c) crane model or mark;
d) manufacturing date and production number;
e) manufacturer’s name
6.2 Packaging, transportation, storage
6.2.1 The packaging, transportation and storage of cranes shall comply with the relevant provisions of GB191 and GB/T13384. 6.2.2 The following documents should be placed in the first packing box of the crane: a) Crane qualification certificate;
b) Crane operation and maintenance instructions (including the instructions of the purchased electrical equipment); c) Packing list;
d) Other relevant technical documents.
6.2.3 During the transportation and storage of the crane, effective rain and moisture-proof measures must be taken for the insulation part of the crane. 369
Quality guarantee period
JB/T 8907
The manufacturer shall ensure that the supplied crane can work normally within 12 months from the date of use, but not more than 18 months from the date of delivery, under the condition of proper storage, reasonable installation and correct use by the user. 370
JB/T89071999
Appendix A
(Appendix of tips)
Maintenance and maintenance of cranes
Before each shift, use compressed air to blow away the dust splashed on the crane trolley and lifting mechanism. A1
Before each shift, measure the insulation resistance value of the insulating parts to see if it meets the requirements of 3.2.7, otherwise the machine shall not be started. A2
According to the frequency of use or when the insulation resistance value drops below the standard value, the insulating parts of each insulating part shall be replaced in time. A3
Before formal work, check whether the action of the brake is sensitive, safe and reliable. A4
A5When the crane is lifting heavy objects whose length exceeds the width of two rows of electrolytic cells, special protective measures shall be taken to avoid equipment and personal accidents caused by electric shock.1G, loading, during the test, each action should be started and braked repeatedly within its entire range of motion. When the suspended test load is started in the air, the test load should not have reverse movement. During the test, the operation interval should be left according to the motor power-on duration of the machine, and the control should be carried out according to the operating procedures. It must be noted that the acceleration, deceleration and speed must be limited to the normal working range of the crane. According to its working cycle, the test time should last at least 1 hour. If each component can complete its functional test and no damage to the mechanism or component is found in the subsequent visual inspection, and no looseness or damage is found in the connection, the test result is considered to be qualified. 5 Inspection rules
5.1 Factory inspection
5.1.1 Each crane should be inspected before delivery, and the inspection content includes all items except Chapter 4 and Chapter 7 of this standard. 5.1.2 The crane should be pre-assembled at the manufacturer\. During pre-installation, the cab of the bridge part may not be installed, the wire rope and the picking device of the trolley part may not be tied, and the running wheels should be suspended. 5.1.3 Carry out an empty running test, start each mechanism separately, and run it in the forward and reverse directions. The cumulative test time is ≥5min. 5.1.4 The quality inspection department of the manufacturer shall conduct item-by-item inspection according to the product drawings and this standard. Only after the inspection is qualified will it be allowed to be accepted, and a "Product Qualification Certificate" shall be issued to the user. 5.2 Type inspection
5.2.1 Type inspection should generally be carried out in any of the following situations: a) Trial determination and identification of new products or old products transferred to the factory for production; b) After formal production, if there are major changes in structure, materials, and processes that may affect the performance of the crane; c) When the product has been discontinued for more than 2 years and production is resumed; d) When the factory inspection results are significantly different from the last type inspection; e) When the national quality supervision agency proposes a requirement for type inspection. 5.2.2 The content of type inspection is the test content specified in Chapter 4 in addition to the factory inspection. 5.2.3 If the manufacturer does not have the test conditions, the type test should be carried out at the user's site. 5.2.4 Type test shall be carried out by random sampling at the manufacturer, and the sampling quantity shall be 1 unit. 6 Marking, packaging, transportation and storage
6.1 Crane marking
6.1.1 An obvious crane tonnage plate shall be set outside the mid-span of the crane main beam, and the tonnage plate shall indicate: a) rated lifting capacity;
b) manufacturer’s name and factory logo, trademark (if any); 6.1.2 A crane sign shall be installed in a conspicuous position in the crane driver’s cab, and the following shall be indicated on the sign: a) crane name;
b) crane main performance parameters;
c) crane model or mark;
d) manufacturing date and production number;
e) manufacturer’s name
6.2 Packaging, transportation, storage
6.2.1 The packaging, transportation and storage of cranes shall comply with the relevant provisions of GB191 and GB/T13384. 6.2.2 The following documents should be placed in the first packing box of the crane: a) Crane qualification certificate;
b) Crane operation and maintenance instructions (including the instructions of the purchased electrical equipment); c) Packing list;
d) Other relevant technical documents.
6.2.3 During the transportation and storage of the crane, effective rain and moisture-proof measures must be taken for the insulation part of the crane. 369
Quality guarantee period
JB/T 8907
The manufacturer shall ensure that the supplied crane can work normally within 12 months from the date of use, but not more than 18 months from the date of delivery, under the condition of proper storage, reasonable installation and correct use by the user. 370
JB/T89071999
Appendix A
(Appendix of tips)
Maintenance and maintenance of cranes
Before each shift, use compressed air to blow away the dust splashed on the crane trolley and lifting mechanism. A1
Before each shift, measure the insulation resistance value of the insulating parts to see if it meets the requirements of 3.2.7, otherwise the machine shall not be started. A2
According to the frequency of use or when the insulation resistance value drops below the standard value, the insulating parts of each insulating part shall be replaced in time. A3
Before formal work, check whether the action of the brake is sensitive, safe and reliable. A4
A5When the crane is lifting heavy objects whose length exceeds the width of two rows of electrolytic cells, special protective measures shall be taken to avoid equipment and personal accidents caused by electric shock.
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