HG/T 20663-1999 Design requirements for metering, packaging and palletizing systems for chemical powder and granular products (with clause explanation)
Some standard content:
Industry Standard of the People's Republic of China
Specification on Design of Metro-Measuring Packaging and Palletizing System for Chemical Powder-Granule ProductsHG/T 20663-1999
Editor: China Wuhuan Chemical Engineering CompanyApproval Department: State Administration of Petroleum and Chemical IndustryImplementation Date: April 1, 2000
National Chemical Engineering Construction Standard Editing Center (Former Engineering Construction Standard Editing Center of the Ministry of Chemical Industry) 2000 Beijing
This standard is formulated by the National Chemical Powder Engineering Design Technology Center Station in accordance with the arrangement of the "Chemical Construction Standard (1995) No. 33" notice issued by the Construction Coordination Department of the former Ministry of Chemical Industry. This standard is based on HG2051892 "Design Principles for Chemical Mechanized Transportation", combined with the regulations, specifications, regulations and engineering experience compiled by relevant departments at home and abroad in recent years, and formulated according to the needs of engineering design, and has been reviewed and approved by the Chemical Powder Engineering Design Technology Committee.
This standard specifies the main contents of the process system and layout design, equipment selection, production auxiliary facilities and living facilities, labor organization and quota, and requirements for relevant majors of the metering, packaging and palletizing system of chemical powder and granular products, meeting the depth of engineering design. The use of this standard will be conducive to improving the design level and design quality and accelerating the design progress. This standard is proposed and managed by the National Chemical Powder Engineering Design Technology Center, and is authorized to be responsible for the specific interpretation of this standard. The main editor of this standard: China Wuhuan Chemical Engineering Company The participating units of this standard: National Chemical Powder Engineering Design Technology Center Drafting person of this standard: Huang Xuequn
Yan Fumin
1.0.1 In order to unify the principles and standards of engineering design of metering, packaging and palletizing systems for chemical powder and granular products, better implement the national technical and economic policies and technical standards, further improve the design level and design quality, and accelerate the design progress, this regulation is specially formulated.
1.0.2 This regulation applies to the design of bagged chemical powder and granular product metering, packaging and palletizing systems for new or expanded projects of large and medium-sized chemical enterprises. The design of the metering, packaging and palletizing system for bagged powder and granular products of small chemical enterprises and other industries can also be used as a reference.
1.0.3 The design of the metering, packaging and palletizing system for chemical powder and granular products should be combined with the actual project, absorb advanced technical experience at home and abroad, adopt mature new processes and new equipment, comply with the relevant provisions of labor safety and health and environmental protection, and strive to achieve advanced technology, reasonable layout, reliable operation, safe operation, convenient maintenance, and economical and practical. 1.0.4 The design of the metering, packaging and palletizing system for chemical powder and granular products should be based on the long-term planning of the production scale of the whole plant, comprehensively planned, and constructed in stages, leaving room for expansion. If it is confirmed through technical and economic comparison that the phased construction is unreasonable, it can also be built one by one. When expanding the construction, it should be combined with the actual situation of the original production system and give full play to the capacity of the original facilities. 1.0.5 In addition to complying with these regulations, the design of the metering, packaging and palletizing system for chemical powder and granular products should also comply with the provisions of the relevant national standards in force.
1.0.6 Related or referenced standards
The provisions contained in the following standards constitute the provisions of this regulation before being cited in this regulation. The versions shown are valid when this regulation is published. All standards will be revised, and parties using this regulation should explore the possibility of using the following standards to promote the latest version.
GB/T 2934
GB3796
GB/T 4995
GB/T 4996
GB8569
GB8920
GB9774
GB10486
GB12463
GB13757
GB15233
GB15234
GB/T16470
《Dangerous Goods Packaging Marking》
《Packaging Storage and Transportation Pictorial Marking》
《Main Dimensions and Tolerances of Intermodal Universal Flat Pallets》《General Rules for Pesticide Packaging》
《Performance Requirements of Intermodal Universal Flat Pallets》
《Test Methods for Intermodal General Flat Pallets》
《Industrial Sodium Carbonate Packaging》
《Solid Chemical Fertilizer Packaging》
《Food Additive Sodium Carbonate Packaging》
《General Technical Conditions for General Cargo Transport Packaging》
《Railway Freight Steel Flat Pallets》
《General Technical Conditions for Dangerous Goods Transport Packaging》
《Bag Transport Packaging Dimension Series》
《Packaging Unit Cargo Dimensions》
《Plastic Flat Pallets》
《Pallet Packaging》
GB50046
GB50160
GBI 16
HG20518
HG20532
HG20533
HG20534
HG20535
HG20547
HG/T20568
JJG731
Ministry of Railways
《Design Code for Anticorrosion of Industrial Buildings》
《Design Code for Fire Protection of Petrochemical Enterprises》《Design Code for Fire Protection of Buildings》
《Design Principles for Chemical Mechanized Transportation》《Design Safety and Health Regulations for Chemical Powder Engineering》《Uniform Regulations for Common Terminology in Chemical Mechanized Transportation Design》《Design Regulations for Chemical Solid Raw Materials and Fuels》《Design Regulations for Chemical Solids》 Regulations on the Design of Material Handling and Unloading Systems, Regulations on the Accuracy of Packaging and Measurement of Petrochemical Powder and Granular Products, Regulations on the Design of Chemical Solid Material Yards and Warehouses, Regulations on the Design of Electric Power for Explosive and Fire Hazardous Environments in Chemical Enterprises, and Regulations on the Verification of Quantitative Automatic Weighing Instruments. 2. Process System Design 2.1.1.2.2.2.3.3.4.4.5.1.5.2.2.3.4.5.6.6.7.8.8.9.10.111.11.2 ... 1 For products with output above the scale of medium-sized factories, single varieties, and bulk storage, it is advisable to adopt a solution of bulk storage as the main method and bag storage as the auxiliary method.
2 Special products that cannot be stored in bulk should be packaged and stored in bags in time. 3 The same set of production equipment can produce multiple varieties or brands of products. It is not advisable to use bulk storage. Single-piece packaging bags or bulk bag storage should be used. If necessary, a buffer silo with a storage capacity of one shift to one day can be set up. 4 When bulk storage is used and transportation conditions are available, a solution of centralized packaging and direct loading (shipping) can be adopted. In other cases, continuous packaging and bagged finished product storage is generally adopted. 5· For large and medium-sized factories that mainly store finished products in bulk, auxiliary bag storage warehouses can be set up according to the actual needs of product transportation. The storage capacity of the bag storage warehouse can be considered based on 1 to 3 days of daily output. 6 For large usage and fixed users, it is advisable to use bulk bags, containers or group transportation; for products that can be transported in bulk, conditions should be created to strive for counterpart bulk transportation.
2.1.3 The process design of the metering, packaging and palletizing system for chemical powder and granular products that are flammable, explosive, toxic, radioactive or highly corrosive and prone to dust generation must comply with the provisions of the current relevant standards. 2.1.4. For chemical powder and granular products that are prone to static electricity, when static electricity affects product quality or creates a risk of fire and explosion, all equipment, chutes and pipelines in the metering, packaging and palletizing system should be reliably grounded. 2.1.5 The mechanization and automation level of the metering, packaging and palletizing system for chemical powder and granular products should be consistent with the level of chemical production equipment. In the design, we should try to reduce labor intensity, improve operating conditions, ensure the safety and health of workers, and at the same time save investment, avoid being divorced from reality, and blindly pursue high standards and high levels. 2.2 System Design
2.2.1 The metering, packaging and palletizing system for chemical powder and granular products starts from the entry of bulk materials into the packaging building to the palletizing of bagged finished products. 2.2.2 The chemical powder and granular product metering, packaging and palletizing system includes bulk material distribution, intermediate storage, metering, packaging, detection (metal detection and weight detection), palletizing (or stacking), dust control (dust removal), bulk material recovery and other subsystems and controls. The selection or combination of each subsystem can be determined based on the project scale, product characteristics, and external transportation conditions. 2.2.3 The daily production capacity of the metering and packaging system is generally calculated as 1.2 times the daily output of the chemical process unit. The total capacity of each packaging and palletizing production line should generally be greater than the conveying capacity of the product into the packaging building. 51
2.2.4 Determination of system work shifts and working hours per shift 1 When chemical powder and granular products are stored in bulk or have a buffer silo (transition silo) that stores more than one shift of production, the metering, packaging and palletizing system can be a two-shift system; when the production scale is small, a one-shift system can also be used. 2 When there is no bulk storage and buffer silo, the continuous metering, packaging and palletizing system is a three-shift system. 3 The actual working hours of the system per shift - generally 6 hours. 2.2.5 In large factories, a bulk material recovery and conveying system is generally set up under the packaging unit; in medium-sized factories, bulk material recovery facilities should be considered. The recovered bulk materials can be returned to the packaging system when they have no effect on the performance. If they have an effect, they need to be processed and qualified before returning to the packaging system; if the product requires strict pollution-free, the recovered bulk materials should be packaged separately and stored separately. 2.2.6 In humid areas, dehumidification facilities should be considered in key locations such as packaging operation rooms for packaging and palletizing systems for products that are prone to moisture absorption and deliquesce.
2.2.7 The power air source (compressed air) and protective air source (such as nitrogen) required for the packaging and palletizing system are generally provided by the factory air source. A compressed air buffer tank that can provide 1 to 5 minutes of use should be installed when entering the packaging and palletizing system. When the factory has no power air source, a compressed air supply system can be set up by itself, and the system capacity is determined by the maximum compressed air requirement. 2.3 Packaging specifications and materials
2.3.1 The packaging form, specifications and materials of chemical powder and granular products should be determined based on the characteristics, storage period, transportation method, transportation distance and purpose of the product.
2.3.2 If the product is not transported in bulk bags or bulk unit, the weight of a single package should not exceed 50kg. If it is transported in bulk bags or bulk unit, its weight should generally not exceed 2000kg: when conditions permit, flexible bulk bags of 3000~10000kg can also be used for bulk transport. 2.3.3 This regulation does not take into account small packages weighing 10kg or less for retail sales. The weight specifications of single packages are: (20), 25, (40). 50. 100. (200), 500, 1000. 2000kg. Note: The specifications in brackets are not recommended. 2.3.4 The packaging bags of chemical powder and granular products shall comply with the requirements of relevant standards. For the standards of packaging bags, see Appendix A. 2.3.5 The external dimensions of packaging bags transported in bulk unit and the bottom plane dimensions when the full bag is lying flat can refer to the requirements of "Bag Transport Packaging Dimension Series" (GB13757). 2.3.6 Bag packaging materials should be selected according to the following principles: 1 Plastic woven bags or composite plastic woven bags (outer film or inner film) lined with plastic film bags should be used first; 2 If the product is sold at a short distance or the loading and unloading and transportation conditions are good, polyethylene film bags or polyvinyl chloride film bags can be used according to the supply of raw materials for packaging bags;
3 If there are special needs for the product, a three-in-one composite plastic woven bag with an inner layer of paper can be used; 4 If there are no special requirements, sacks, paper bags and cloth bags are generally not used. 2.3.7 Packaging materials for solid fertilizers should be selected in accordance with the provisions of "Packaging of Solid Chemical Fertilizers" (GB8569). Other chemical products should select appropriate packaging materials in accordance with the corresponding product packaging standards or product standards and in accordance with the provisions of "Packaging of Solid Chemical Fertilizers" (GB8569).
2.3.8 The types of packaging bags are divided into pillow bags and box bags according to their shapes, and into pockets and shelf bags (insert pockets) according to the sealing methods. Fertilizer packaging generally uses pillow bags: box bags are suitable for group unit transportation, and pillow bags can also be used; valve bags are not allowed if there are strict requirements for pollution or moisture resistance. 52
2.3.9 The marking of packaging bags (or other packaging containers) shall comply with the provisions of 2.10 of the "General Technical Conditions for Transport Packaging of General Goods" (GB9774).
2.3.10 For chemical powder and granular products that are dangerous goods, their packaging specifications and materials shall comply with the requirements of the "General Technical Conditions for Transport Packaging of Dangerous Goods" (GB12463), and the packaging container shall be marked according to the "Dangerous Goods Packaging Mark" (GB190). 2.3.11 The packaging materials of food-grade chemical powder and granular products shall comply with the requirements of the corresponding food hygiene standards. 2.3.12 The packaging specifications and materials of pesticide powder and granule products shall comply with the requirements of the General Rules for Pesticide Packaging (GB3796) 2.4 Measurement and measurement error
2.4.1 The packaging measurement of chemical powder and granule products generally adopts automatic quantitative scales, and its accuracy shall meet the requirements of chemical powder and granule product packaging measurement error. Automatic quantitative scales shall be calibrated in accordance with the Verification Procedure for Quantitative Automatic Weighing Instruments (JJG731). Measuring scales that have not been calibrated or that do not meet the requirements of this procedure shall not be used for the packaging of chemical powder and granule products. 2.4.2 The packaging measurement error of chemical powder and granule products shall comply with the requirements of the Measurement Accuracy Regulations for Petrochemical Powder and Granule Products (HG20547). The measurement sampling inspection plan for the process performance assessment of the packaging unit shall be carried out in accordance with this regulation. 2.4.3 The accuracy level of the calibration scale (or weight detector) set in the packaging system shall be higher than the accuracy level of the automatic quantitative scale in the packaging equipment used. And its comprehensive tolerance shall not be greater than 1/3 of the comprehensive tolerance of the automatic quantitative scale in the packaging equipment used. The tolerance of the magnetic code used for verification should be 1/3 less than its comprehensive tolerance. 2.4.4 Volumetric measurement shall not be used except for powder products with uniform particle size, stable loose density and little fluctuation. When volumetric measurement is used, the calibration scale required by 2.4.3 of this regulation shall also be set. 2.4.5 The measurement accuracy of the packaging system shall be marked as follows: M+Am(ka)
where M
the calibrated (nominal) mass (weight) of the filling material in the package, kg, (2. 4.5--1)
the maximum allowable error of the mass (weight) of the filling material in the package, 8, including positive and negative deviations: confidence factor, generally 3 or 2
standard deviation, and the α symbol is marked in the formula (2.4.5-1). The standard deviation of measurement expressed by formula (2.4.5-1) should be [Am|+[Amal
where Am--allowable positive deviation+g,
Amz---allowable negative deviation, g.
2.5 Packaging system
(2.4.5-2)
2.5.1 In order to prevent metal debris and large pieces of materials from entering the packaging system, reliable iron removal, crushing (disintegration) or screening facilities should be set up before the products enter the packaging system.
2.5.2 For packaging systems with multiple packaging production lines, a simple, reliable and reasonable material distribution system should be configured. 53
2.5.3 A buffer storage hopper should be set above the weighing scale of the packaging system. The storage capacity of the buffer storage hopper on each packaging machine should meet the packaging capacity of 0.3~0.8h at the rated production capacity of the packaging machine. The smaller value shall be taken for products that are easy to agglomerate; the total storage capacity of each buffer storage hopper shall meet the delivery capacity of 0.5~1h of the product output of the chemical process from the bulk warehouse. 2.5.4 The weighing scale and filling port of the packaging system shall be equipped with a dust collection system. For products with serious dust, dust collection shall be strengthened. For products that are easy to absorb moisture and agglomerate, dehumidification measures shall be adopted in the dust collection system and packaging machine. 2.5.5 The packaging bag sealing unit--generally should be equipped with a folding device, first crimping and then sewing to ensure the sealing strength and sealing. For products with high sealing requirements, multi-layer bags or composite bags should be used. When multi-layer bags are used, after the inner bag is sealed (heat-sealed or tied), the outer bag is sewed without folding; when composite bags are used, the sealing strip (tape) is affixed after the folding and sewing. 2.5.6 For products with strict requirements for metal foreign matter, such as plastics, resins, rubber, etc., metal detection facilities must be installed on each packaging production line, and the functions of calibration, alarm and rejection of packages mixed with metal foreign matter must be provided. 2.5.7 For products with high requirements for measurement accuracy, weight detection facilities must be installed on each packaging production line, and the functions of calibration, alarm and rejection of packages with unqualified weight must be provided. 2.5.8 The packaging system should be equipped with a calibration scale, and the number of calibration scales should be set at one for every two packaging production lines, with a minimum of one. 2.5.9 When the operating floor of the packaging production line is on the second floor or above, empty bag lifting and handling facilities must be installed. 2.5.10 The measuring scale floor and packaging operating floor of the packaging production line should be equipped with a certain number of compressed air purge interfaces, and the interfaces should be equipped with 5~10m rubber hoses.
2.5.11 The bulk material recovery hopper under the packaging unit should be able to recover the bulk material spilled from the filling port and the bag sealing area. Bulk material recovery and conveying system - generally delivers bulk materials to 1-2 storage hoppers on the scale. Generally, bulk material recovery facilities directly pack the bulk materials on the spot under the bulk material collection hopper. 2.6 Palletizing and grouping system
2.6.1 If chemical powder and granular products need to be stored and transported in groups (pallet groups, network groups) after packaging, a palletizing system should be configured. 2.6.2 The production capacity of the palletizing system is generally equal to or greater than the production capacity of the metering and packaging system. Generally, mechanical palletizing is used, and a palletizer is set up. When the production scale is small, manual palletizing can also be used. 2.6.3 When grouped components are pallets, intermodal general pallets should generally be configured for circulation within and outside the enterprise; when pallets are not circulated outside the factory, special pallets can also be used. The types of pallets can refer to Appendix J3 and J4 of the "Design Regulations for Chemical Solid Material Yards and Warehouses" (HG/T20568).
2.6.4 Pallets are made of wood, steel, plastic, etc. The maximum load of intermodal general pallets is 1t, and the size should comply with the "Main Dimensions and Tolerances of Intermodal General Flat Pallets" (GB/T2934). The type, technical requirements and test methods shall be in accordance with the "Performance Requirements of Intermodal General Flat Pallets" (GB/T4995), "Test Methods of Intermodal General Flat Pallets" (GB/T4996), "Steel Flat Pallets for Railway Freight" (GB10486) and "Plastic Flat Pallets" (GB15234). 2.6.5 The size and type of special pallets are determined according to the needs of the project. The technical requirements and test methods can refer to the provisions of the standards listed in Article 2.6.4 of these regulations.
2.6.6 When the grouping components are networked, they are generally made of polyolefin materials. The type, size, technical requirements and inspection methods shall be implemented in accordance with the provisions of "Flexible Container Bags" (GB10454) and "3~10t Flexible Container Bags for Packaging Containers" (GB/T14461). 2.6.7 Pallet grouping should ensure the integrity of the grouping units and effectively prevent collapse. The fixing method shall be in accordance with 4.6 of "Pallet Packaging". When it is demonstrated that the internal and external transportation conditions of the factory are technically and economically reasonable, shrink or stretch film group packaging can be used. Shrink packaging uses polyethylene or polyvinyl chloride thermoplastic film; stretch packaging uses polyethylene, polypropylene or polyvinyl chloride stretch film.
2.6.8 Compressed air purge interfaces should be equipped next to palletizers and wrapping machines, and 5~10m rubber hoses should be connected to the interfaces. 2.6.9 If chemical powder and granular products do not need to be stored and transported in groups after packaging, a stacking machine should be installed in the bagging warehouse. The production capacity of the stacking machine should generally be 1.2 times the total production capacity of the metering and packaging system entering the stacking system. 2.6.10 The design of the storage warehouse for chemical powder and granular products shall comply with the current "Chemical Solid Material Yard and Warehouse Design Regulations" (HG/T 20568).
The loading and shipping design of chemical powder and granular products shall comply with the current "Chemical Solid Material Loading and Unloading System Design Regulations" 2.6.11
(HG 20535).
2.7.1·The control level of the metering, packaging and palletizing system of chemical powder and granular products shall be compatible with the control level of chemical production equipment. 2.7, 2 The metering, packaging and palletizing systems of chemical powder and granular products shall be provided with control systems by their manufacturers. The control host of the metering packaging system and the palletizing system can be arranged nearby, but it should be centrally arranged in the control room for places with corrosion or a lot of dust, and the on-site operation box should be arranged in a place where it is convenient for workers to operate. 2.7.3! The control of the material distribution system entering the storage hopper on the packaging building scale should be included in the packaging system control room, and the system operation status and accident signals can be output to the chemical production device control room (or bulk material warehouse control room). 2.7.4 The packaging and palletizing system of large factories should be centrally controlled automatically, and the control system provided by the manufacturer should have functions such as interlocking, control, operation status and accident sound and light signals, alarm, fault diagnosis, and automatic elimination of metering errors. =
3 Equipment selection
3.1 General provisions
3.1.1 The equipment selection of the metering packaging and palletizing system of chemical powder and granular products shall comply with the selection principles specified in Chapter 3 of the "Design Principles of Chemical Mechanized Transportation" (HG20518). 3.1.2 When selecting equipment, the production capacity of the selected equipment should be verified. If necessary, the actual production capacity of the equipment should be investigated or tested before determination.
3.1.3 When the project is large in scale and the capacity of the metering packaging and palletizing system is large, it is advisable to select a single metering packaging and palletizing mechanical equipment with a large production capacity to reduce the number of packaging and palletizing production lines. 3.1.4 Determination of spare machines
1 For continuous packaging and palletizing production lines with three shifts, a spare production line should be set up. Generally, 3 production lines have one spare production line, but at least one spare production line is set up.
2 For intermediate packaging and palletizing production lines with two shifts or less, spare production lines are generally not set up. In special cases, when a spare production line is required, it should be determined through technical and economic demonstration. 3.1.5--Generally, one packaging production line corresponds to one palletizing production line: In special cases, 2 to 3 packaging production lines can also correspond to one palletizing production line, but attention should be paid to the connection and matching of packaging production capacity and palletizing production capacity. 3.1.6 The selected equipment should be compatible with the material characteristics of the packaged product, and should also be compatible with the natural environment and geographical conditions (including meteorological conditions, altitude, earthquake intensity, whether it is hot and humid, etc.) of the construction area. 3.2 Packaging unit equipment
3.2.1 Packaging unit equipment (packaging unit) generally consists of feeding, metering, filling (bag filling), folding, sealing, conveying, bag pouring, weight detection, metal detection and other auxiliary parts. 3.2.2 Rubber packaging unit equipment is generally that the rubber particles are directly fed into the briquetting machine to be pressed into blocks after being weighed and qualified, and then bagged and sealed after weight detection and metal detection. 3.2.3 According to whether the bagging and sealing parts are manual or automatic, the packaging unit is divided into semi-automatic and fully automatic. Generally, petrochemical enterprises should choose fully automatic, and fertilizer and other chemical enterprises should choose semi-automatic, and leave room for transformation to fully automatic in the layout.
3.2.4 The feeding devices of automatic quantitative scales include gravity (valve), belt, spiral, vibration (electromagnetic vibration or motor vibration), turbine and aeration fluidization, etc., which are selected according to the material characteristics of chemical powder and granular products. For specific selection, refer to Appendix C. 3.2.5 Select a weighing scale with corresponding accuracy according to the allowable measurement error of the powder and granular products. For petrochemical products classified as Class A, such as plastics, resins, fine chemical products and detergents, it is advisable to use an automatic weighing scale with an accuracy level of Class A and Class B. For fertilizers, soda ash, dyes, etc., which are classified as Class B, it is advisable to use an automatic weighing scale with an accuracy level of Class 5). For low-priced chemical powder products such as calcium magnesium phosphate, ordinary superphosphate, cement, etc., an automatic weighing scale with an accuracy level of (56
can be selected. The weighing scale used for large container bags of 500-2000kg should be one level higher than the above accuracy.
3.2.6 Packaging weighing scales generally use electronic scales with microcomputer control and digital signal transmission. Packaging weighing scales with low measurement accuracy can use lever-type mechanical scales or lever-type electromechanical scales. 3.2.7 Packaging weighing scales generally use net weight scales. For single-unit production capacity below 400bag/h, a simple gross weight scale can be used. Measuring scales for cabinet bag filling Generally, a gross weight scale is used. A gross weight scale should also be used for filling bulk bags. 3.2.8 The number of packaging and measuring scales configured on each filling port is generally determined by the packaging unit manufacturer, and can also be calculated by referring to the following formula:
Where n is the number of packaging and measuring scales on each filling port: Q—-production capacity of each filling port, bag/h, q—production capacity of a single scale, bag/h;
k—utilization coefficient, when n=2, k0.85, when n3, k070 (3.2.8)
3.2.9 ＇ For powder and granular products that are easy to adhere or absorb moisture and adhere to agglomerates, anti-sticking measures must be taken for the feeding device, weighing hopper, and under-scale funnel. For corrosive powder and granular products, corresponding anti-corrosion measures should be taken. For powder and granular products that require to minimize pollution, all parts in contact with the material should be made of stainless steel. When the powder and granular products may release corrosive gases, the packaging equipment should take anti-corrosion measures. For example, urea packaging equipment should not use copper and copper alloys. 3.2.10 For loose and easily inflated chemical powder and granular products, measures should be taken when filling the bags to discharge the gas in the materials and to make the material storage bags full.
3.2.11 For each packaging production line with a production capacity of less than 1200bag/h, it is advisable to use a fixed filling port: when it is above 1200bag/h, it is advisable to use a fixed filling port. Use a rotary filling port with 3 to 6 filling nozzles. 3.2.12 The speed of the sealing equipment (heat sealing machine or sewing machine) should match the production capacity of the packaging line. When using a sewing machine for sealing, generally each packaging line should be equipped with two sewing machines (one for use and one for backup), and they can be easily switched. 3.2.13 The speed of the bag sealing conveyor (bag sewing conveyor) should be adjustable so as to coordinate with the speed of the folding machine, sealing machine, and sewing machine.
3.2.14 The bag pouring machine should be a compact, flexible, and easy-to-maintain model to ensure that the sealed packages are neat, regular, and consistent after being poured on the conveyor.
3.2.15 The metal detector should be able to detect packages mixed with impurities of 3mm and above magnetic metal (ferrite) and $5mm and above non-magnetic metal (non-ferrite). 3.2.16 For continuous packaging systems with a measurement accuracy of above level, a continuous calibration scale-weight detector should be equipped and a weight sorting machine should be formed. For packaging systems with a measurement accuracy of below level), a calibration scale should be installed. The weight detector and calibration scale should meet the requirements of 2.4.3 of this regulation. 3.2.17 According to the needs, the packaging system should be equipped with inkjet or roller printing facilities to mark the product brand and production batch number on the surface of the packaged products that have completed the packaging process.
3.2.18 Generally, a counter for counting the number of packages should be set on each packaging production line. 57
3.2:19. The packaging unit for packaging ammonium nitrate should pay attention to preventing grease and other impurities from mixing into the ammonium nitrate to avoid explosion accidents.
3:2.20 The packaging system should be equipped with a portable bag sealing machine for each packaging line. 3.3 Palletizing group unit equipment
3.3.1 Palletizing group unit equipment (palletizer unit) consists of bag shaping, layer arrangement, palletizing, pallet storage, pallet conveying and other auxiliary parts.
3.3.2 According to whether the layer arrangement part is manual or mechanically automatic, the palletizer unit is divided into semi-automatic and fully automatic types. The selected type should be adapted to the mechanical automation level of the finished product post-processing system. 3.3.3 According to the different grouping components, pallet type palletizer unit and network type palletizer unit are selected respectively. 3.3.4 Common structural types of palletizer units include skateboard type, air cushion type, roller type, fork type, robot type, etc., which can be selected according to their structural characteristics, stacking capacity and combined with the characteristics of product packaging, transportation method, etc. The stacking capacity of various types of palletizer units is shown in Table 3.3.4.
3.3.4#
Palletizer capacity table
Structural type
Packing capacity, bag/h
Skateboard type
.300~5000
Air cushion type
300~2000
Roller type
300-~2000
Fork type
500~3200
Robot typewww.bzxz.net
200~1000
Semi-automatic type
200~~1000
3: 3.5: The bag shaping mechanism should ensure that the bags entering the palletizing system are regular in shape. Generally, the rolling method is adopted, and the extrusion method can also be used.
3.3.6 The automatic layer arrangement part of the automatic palletizer group should be able to easily change the stacking pattern. See Appendix D for typical stacking patterns. 3.3.7 The function of the palletizer should ensure that the appearance of the grouped unit goods is regular and stable, and there is no loosening or collapse. 3:3.8 The dimensions of pallets used in conjunction with the palletizer group are shown in Table 3.3.8. Table 3.3.8. Pallet dimensions
140~160
3.3.9 When the grouped units are wrapped in shrink film, a wrapping machine and a heat shrinking machine should be selected. 3.3.10 When the grouped units are wrapped in stretch film, a stretch wrapping machine should be selected. 3.4·Stacking machine
3.4.1 The stacking machine should be adapted to the span of the warehouse. From a technical and economic point of view, the span of the warehouse should not be less than 18m. 58
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