This standard replaces GB/T12620-1990 "Sieve plates with oblong and rectangular holes" and GB/T3943-1983 "Sieve plates with round and oblong holes". This standard specifies the types and parameters, technical requirements, inspection rules, marking, packaging, transportation and storage of metal sieve plates with oblong, rectangular and circular holes. This standard is applicable to sieve plates used for screening, ventilation, decoration, mineral processing, grain, oil, feed processing, screening and filtering, etc., with oblong, rectangular and circular holes. Compared with GB/T 12620-1990 and GB/T 3943-1983, the main revisions of this standard are as follows: ———the scope of application has been expanded; ———the terminology has been adjusted; ———the limit deviations of the sieve hole widths in Tables 1, 2 and 3 of the basic dimensions and parameters of oblong hole sieve plates and rectangular hole sieve plates have been revised; ———the arrangement types have been added; ———the requirements of 5.1 sieve plate materials, 5.2 plate thickness, and 5.4 that sieve plates are not allowed to be rusted have been added; ———the sampling rules in 6.5 and the inspection requirements in 6.6 have been revised; ———the processing requirements of sieve plates in 5.5 have been revised; ———some specific requirements and inspection rules for finished sieve plates have been deleted to meet the needs of different users; ———the provisions on sieve plate numbers have been deleted to avoid confusion caused by too many varieties. GB/T 12620-2008 Sieve plates with oblong holes, rectangular holes and round holes GB/T12620-2008 standard download decompression password: www.bzxz.net
This standard replaces GB/T12620-1990 "Sieve plates with oblong holes and rectangular holes" and GB/T3943-1983 "Sieve plates with round holes and oblong holes". This standard specifies the types and parameters, technical requirements, inspection rules, marking, packaging, transportation and storage of metal sieve plates with oblong holes, rectangular holes and round holes. This standard is applicable to sieve plates for screening, ventilation, decoration, mineral processing, grain, oil, feed processing, screening and filtering, etc., with oblong holes, rectangular holes and round holes. Compared with GB/T 12620-1990 and GB/T 3943-1983, the main modifications of this standard are as follows: ———the scope of application has been increased; ———the terminology has been adjusted; ———the limit deviations of the sieve hole widths in Tables 1, 2 and 3 of the basic dimensions and parameters of oblong hole sieve plates and rectangular hole sieve plates have been modified; ———the arrangement type has been added; ———the requirements of 5.1 sieve plate materials, 5.2 plate thickness, and 5.4 sieve plates not allowed to be rusted have been added; ———the sampling rules in 6.5 and the inspection requirements in 6.6 have been modified; ———the requirements for sieve plate processing in 5.5 have been modified; ———some specific requirements and inspection rules for finished sieve plates have been deleted to meet the needs of different users; ———the provisions of sieve plate numbers have been deleted to avoid confusion caused by too many varieties.
This standard replaces GB/T12620-1990 “Sieve plates with oblong holes and rectangular holes” and GB/T3943-1983 “Sieve plates with round holes and oblong holes”.
Compared with GB/T12620-1990 and GB/T3943-1983, the main revisions of this standard are as follows:
---Increased the scope of application;
---Adjusted the terminology;
---Modified the limit deviation of the sieve hole width in Table 1, Table 2 and Table 3 of the basic dimensions and parameters of oblong hole sieve plates and rectangular hole sieve plates;
---Added the arrangement type;
---Added the requirements of 5.1 sieve plate material, 5.2 plate thickness, 5.4 sieve plate is not allowed to be rusted, etc.;
---Modified 6.5 sampling rules and 6.6 inspection requirements;
---Modified 5.5 sieve plate processing requirements;
---Deleted some specific requirements and inspection rules for finished sieve plates to meet the needs of different users;
---Deleted the provisions of sieve plate number to avoid confusion caused by too many varieties.
Appendix A of this standard is an informative appendix.
This standard is proposed and managed by the National Technical Committee for Standardization of Screen Screening and Particle Sorting Methods.
The drafting units of this standard are: China Machinery Productivity Promotion Center, Hunan Wujiang Machine Screen Co., Ltd.
The main drafters of this standard are: Yu Fang, Wan Jun, Sun An.
The previous versions of the standards replaced by this standard are:
---GB/T12620-1990;
---GB/T3943-1983.
The clauses in the following standards become the clauses of this standard through reference in this standard. For all dated referenced documents, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, the parties to the agreement based on this standard are encouraged to study whether to use the latest versions of these documents. For all undated referenced documents, the latest versions are applicable to this standard.
GB/T708 Dimensions, shapes, weights and permissible deviations of cold-rolled steel sheets and strips
GB/T1804 Tolerances and fits Limit deviations of dimensions without tolerances (GB/T1804-2000, eqvISO2768-1:1989)
GB/T2828.1 Sampling procedures for inspection by attributes Part 1: Sampling plans for batch inspection based on acceptance quality limit (AQL) (GB/T2828.1-2003, ISO2859-1:1999, IDT)
GB/T10061 Method for marking sieve holes in sieve plates (GB/T10061-1988, eqvISO7806:1983)
GB/T15602 Industrial sieves and screening terms (GB/T15602-1995, eqvISO9045:1990)
GB/T19360 Technical requirements and test methods for industrial perforated metal plates (GB/T19360-2003, ISO10630:1994, IDT)

ICS73.120
National Standard of the People's Republic of China
GB/T 12620-—2008
Replaces GB/T12620—1990, GB/T3943—1983 Round and elongated apertures with round and sguare plate screensIssued on 2008-04-16
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of ChinaStandardization Administration of the People's Republic of China
Implemented on 2008-10-01
CB/T12620—2008
This standard replaces GB/T12620-1990 "Sieve plates with round and rectangular holes" and GB/T3943-1983 "Sieve plates with round and elongated holes". Compared with GB/T12620-1990 and GB/T3943-1983, the main changes in this standard are as follows: 1. The scope of application has been increased;
- The terminology has been adjusted;
The limit deviation of the sieve hole width in Tables 1, 2 and 3 of the basic dimensions and parameters of the oblong hole sieve plate and the rectangular hole sieve plate has been modified; the arrangement type has been added!
- Added 5.1 sieve plate material, 5.2 plate thickness regulations, 5.4 sieve plate is not allowed to have rust and other regulations; - Modified 6.5 sampling rules and 6.6 inspection requirements; modified 5.5 sieve plate addition requirements;
Deleted some specific requirements and inspection rules for finished sieve plates to meet the needs of different users; deleted the provisions of sieve plate numbers to avoid confusion caused by too many varieties. Appendix A of this standard is an informative appendix.
This standard was proposed and managed by the National Technical Committee for Standardization of Screen Screening and Particle Sorting Methods. This standard was drafted by: China Machinery Productivity Promotion Center, Chaonan Wujiang Machine Screen Co., Ltd. The main drafters of this standard are: Yu Ting, Wan Jun, Huan An. The previous versions of the standards replaced by this standard are: GB/T 1262C—1390:
-GB/T39431983
1 Scope
Long-hole, rectangular-hole and round-hole sieve plates
GB/T12620—2008
This standard specifies the types and parameters, technical requirements, inspection rules, marking, packaging, transportation and storage of metal long-mesh, rectangular-hole and round-hole sieve plates.
This standard applies to sieve plates for screening, ventilation, decoration, mineral processing, grain, oil, feed processing, screening and filtering, etc., with oblong holes, rectangular holes and round holes.
2 Normative reference documents
The following standards’ clauses become the clauses of this standard before being cited by this standard. For all dated reference documents, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, the parties who reach an agreement based on this standard are encouraged to study whether to use the latest versions of these documents. For all undated reference documents, the latest versions are applicable to this standard. GB/T708 Dimensions, shapes, weights and permissible deviations of cold-rolled steel sheets and strips CB/T1804 Tolerances and fits: Limit deviations of dimensions without tolerances (GB/T1804-2000, eqVISO2768-1:1989) GB/T2828.1 Sampling inspection procedures by attributes Part 1: Sampling plans for batch inspection based on acceptance quality limits (AQL) (GB/T 2828.1--2003, ISO 2859-1:1999, IDT) GB/T10061 Marking method for sieve plate holes (GB/T10061-1988, eqvISO7806:1983) GB/T15602 Industrial sieves and screening terms (GB/T15602-1995eqvIS09045:1990) GB/T19360 Technical requirements and inspection methods for industrial perforated metal plates (GB/T19360-2003, ISO10630:1994, T) 3 Terms and symbols
Basic hole spacing:
Basic hole spacing in the direction of sieve hole width; P2——Basic hole spacing in the direction of sieve hole length; - Basic sieve hole size:
Basic sieve hole width size;
Basic hole length size.
3.2 Other terms and symbols shall comply with the provisions of GB/T15602. 4 Types and parameters
4.1 The arrangement of holes shall comply with the provisions of GB/T10061, with the addition of angled arrangement as shown in Figure 5 and Figure 6, with angle α ranging from 19° to 45°. The angle α may also be determined according to product design.
a) Long round holes, Z-type arrangement, as shown in Figure 1,
b) Long round holes: U-type arrangement, as shown in Figure 2
e) Rectangular holes: Z-type arrangement, as shown in Figure 3.
d) Rectangular holes: U-type arrangement, as shown in Figure 4
c) Long round holes, Z-type arrangement at an angle, as shown in Figure 5. Rectangular holes, Z-type arrangement at an angle, as shown in Figure 6.
Round holes, T-type arrangement, as shown in Figure 7.
Round holes: T-type arrangement, as shown in Figure 8.
GB/T126202008
4.2 The sieve hole marking shall comply with the provisions of GB/T10061. 4.3 Basic dimensions and parameters
GB/T12620—2008
GB/T12620-—2008
4.3.1 The basic dimensions and parameters of the oblong hole sieve plate and the oblong hole sieve plate shall comply with the provisions of Table 14.3.2 The basic dimensions and parameters of the oblong hole sieve plate and the oblong hole sieve plate bevel shall comply with the provisions of Table 24.3.3 The basic dimensions and parameters of the round hole sieve plate shall comply with the provisions of Table 3. 4.3.4 The limit deviation of the length and width of the sieve plate shall comply with the provisions of the tolerance grade h14 in GB/T1804. If the user has special requirements, it shall be jointly agreed upon by the supply and demand parties.
4.3.5 The size of the sieve plate margin shall be jointly agreed upon by the supply and demand parties, and the limit deviation of the sieve plate margin shall comply with the provisions of Table 4. The two diagonals of the sieve plate should be equal, and its limit deviation should comply with the provisions of tolerance grade h15 in GB/T1804. 4.3.6
Sieve hole widthWww.bzxZ.net
Basic size
Sieve hole length
±0.506.00
Limit deviation
±0.30±0.6c
Limit deviation
Unit is mm
Screening area percentage/
Oval hole
Arrangement
±0.85±1.70
Rectangular hole||tt| |and U-type
Sieve hole width
Basic size
Sieve hole length
Table 1 (continued)
Limit deviation
Number/piece
Limit deviation
Number/piece
±0.90±1.8c
±1.6d±3.20
GB/T12620——2008
Unit: mm
Screening area percentage!
Oval hole
Arrangement
±1.25±2.50
160±3.20
±3.00±6.00
Rectangular hole
and U-shaped
GB/T 12620—2008
Sieve hole width
Basic size
Sieve hole length
0. 9 ±0. 05
1.3±0.05
1. 4±0.05
1.5±0. 05
L 5, 5
±a,05
士0.0元
20 ↓ 6. 4
Limited error
number/piece
Average single
±0.25±0.5
±0.25±0.5
±0.25±0.5
± 0. 25 ±0. 5
±0.25±0.5
10.25±0.5
±0.25±0.5
±0.25±0.5
Limit deviation
number/piece
±1 [,0--1,5
±1 1.5~2.
±1 1.5~2. 0
±1 1.5~2.a
±1 1. 5~2. 0
±1 [1. 5-~-2.
Unit is millimeter
Screening area
Percentage/%
Rectangular hole
And rectangular hole
Screening hole size
Basic size
First series
Second series
Basic size
Pitch P
Number of consecutive holes in measuring area/
.0;5.0
Limit deviation
GB/T12620—2008
Unit is millimeter
Screening area percentage
(calculated value)
GB/T12620--2008
Aperture size
Basic size w1
First series
Second series
Basic size
Table 3 (continued)
Aperture spacing
Observation area
Number of continuous holes/
Limit deviation
Note 1: The percentage of screening accumulation indicates the percentage of the punching area relative to the effective area of ​​the screen: Note 2: The percentage of screening area corresponds to the value of the hole technical size P. Table 4
Basic size of hole spacing P
>5.00~20. 0
5Technical requirements
Unit is meter
Percentage of screening area/
(calculated value)
Unit is meter
Limit deviation of edge of screen plate
The screen plate material shall be made of steel plate and non-ferrous metal, and the material shall be agreed upon by the supply and demand parties. The plate thickness shall be in accordance with the provisions of Table 1, Table 2 and Table 3, and the allowable deviation of the plate thickness shall be in accordance with the provisions of GB/T708. 5.2
The size and limit deviation of the screen plate shall comply with the provisions of Table 1, Table 2 and Table 3. 5.3
The screen plate shall not be allowed to have defects such as broken tendons, cracks, delamination, and severe rust. 5.4
GB/T12620—2008
5.5 If there are defects such as incomplete punching, submerged punching, burrs, etc. in the sieve plate, the provisions of Chapter 7 of GB/T19360 shall be followed. 5.6 According to the use method and the needs of different users of processed materials for new products, the supply and demand parties can negotiate technical requirements based on design requirements. 5.7 In order to improve the service life of the sieve plate, it is recommended to heat treat the sieve plate used for material processing. The technical requirements for heat treatment are shown in Appendix A. 6 Test methods and inspection regulations
6.! The length and width of the sieve plate, the edge retention of the sieve plate, the size of a single sieve hole, the average sieve hole size, the size of a single hole and the average hole spacing should be tested. The method shall be in accordance with 6.6 regulations.
6.2 The end hole size is measured and inspected with a graduation value of 0.02mm. 6.3 The hole spacing is inspected with a measuring tool with a graduation value of 0.02mm. The length and width of the sieve plate, the margin width and the diagonal size are inspected with a steel ruler with a graduation value of 0.5mm. 6.4
6.5 Sampling rules
Acceptance sampling inspection of products shall be carried out in accordance with the provisions of GB/T2828.1. Each batch shall not be less than 5 pieces. If there are less than 5 pieces, a full inspection shall be carried out. 6.6 First, visually inspect the overall condition of the sieve plate on the sieve surface, and then inspect the dimensions in 6.1 in the possible out-of-tolerance area or any selected area. The average hole spacing size of each batch shall be measured according to the number of continuous holes along any one direction in the measurement area specified in Table 1, Table 2 and Table 3. 6.7 If all items of sieve plate length and length, sieve plate margin width, single sieve hole size, average sieve hole size, single hole spacing size and average hole spacing size are inspected and qualified, then this batch is qualified; if there is one unqualified piece, the sieve plate shall be doubled and the unqualified items shall be re-inspected. If it is still unqualified, then this batch is unqualified.
7 Marking, packaging, transportation, storage
7.1 The sieve plates shipped out of the factory must be accompanied by a quality inspection certificate. 7.2 The sieve plates shipped out of the factory should have the manufacturer's registered trademark. The sieve hole marking can be determined based on the requirements of the purchaser (user). If the sieve plate has a small head or edge, it can be omitted.
7.3 Anti-rust and moisture-proof measures should be taken when packaging and transporting the sieve plates. 7.4 The outside of the package should be marked (except for simple packaging), a) Manufacturer's name,
Sieve plate specifications or models:
Number of sieve plates (sheets):
Box (package) outer corridor dimensions and gross weight;
Factory number and date;
This standard number.
GB/T 12620--2008
Appendix A
(Informative Appendix)
General requirements for heat treatment of sieve plates
A.1 When the user has requirements, the heat treatment of the sieve plate is recommended to adopt carbonitriding, soft nitriding, and low-carbon martensitic treatment processes. When there are special requirements, the supply and demand parties negotiate. The general requirements are as follows: A.1.1 Carbonitriding process
Surface hardness: HV100g≥550;
Depth of nitriding layer: 70 μm~170 μm
A.1.2 Soft fluoriding process
Hardness of compound layer: HV100g≥550;
Depth of compound layer: 6m~15μm;
Metallurgical structure: A small amount of spot looseness is allowed on the surface not exceeding one-third of the depth of the compound layer. A1.3 Low-carbon martensitic treatment process
Material: It is recommended to use B3 or 20 steel and other materials, which can also be negotiated by both parties; Hardness: HRA ≥ 68, hardness test after grinding 0. 15 mm off the surface 1 Metallographic structure: The content of non-martensitic structure shall not exceed 5% of the whole structure. A.2 Others
A.2.1 The export sieve plate can be separately stipulated by the supply and demand parties according to the trade contract. A, 2.2 Due to the different usage methods and types of processed materials, the supply and demand parties shall agree on the heat treatment process and parameters according to the actual usage: 107 If all items of the sieve plate length and width, sieve plate margin width, single sieve hole size, average sieve hole size, single hole spacing size and average hole spacing size are inspected and qualified, then this batch is qualified; if there is one unqualified piece, the sieve plates should be doubled and the unqualified items should be re-inspected. If they are still unqualified, then this batch is unqualified.
7 Marking, packaging, transportation, storage
7.1 The sieve plates shipped out of the factory must be accompanied by a quality inspection certificate. 7.2 The sieve plates shipped out of the factory should have the manufacturer's registered trademark, and the sieve hole mark can be determined according to the requirements of the demander (user). If the sieve plate has less head and margin, it can be omitted and not printed.
7.3 Anti-rust and moisture-proof measures should be taken when packaging and transporting sieve plates. 7.4 The packaging should be marked on the outside (except for simple packaging), a) Manufacturer's name,
Sieve plate specifications or models:
Sieve plate quantity (sheets):
Box (package) outer corridor dimensions and gross weight;
Factory number and date;
This standard number.
GB/T 12620--2008
Appendix A
(Informative Appendix)
General requirements for heat treatment of sieve plates
A.1 When the user has requirements, the heat treatment of the sieve plates is recommended to adopt carbonitriding, soft nitriding, and low-carbon martensitic treatment processes. When there are special requirements, the supply and demand parties shall negotiate. The general requirements are as follows: A.1.1 Carbonitriding process
Surface hardness: HV100g≥550;
Depth of infiltration layer: 70 μm~170 μm
A.1.2 Soft fluorination process
Hardness of compound layer: HV100g≥550;
Depth of compound layer: 6m~15μm;
Metallurgical structure: A small amount of point-like looseness is allowed on the surface within one-third of the depth of the compound layer. A1.3 Low-carbon martensitic treatment process
Material: It is recommended to use B3 or 20 steel and other materials, which can also be negotiated by both parties; Hardness: HRA≥68, hardness test after grinding 0. 15 mm on the surface 1 Metallurgical structure: The content of non-martensitic structure shall not exceed 5% of the entire structure. A.2 Others
A.2.1 Export sieve plates can be separately specified by both parties according to the trade contract. A, 2.2 Due to the different usage and types of processed materials, the supply and demand parties agree on the heat treatment process and parameters based on actual usage: 107 If all items of the sieve plate length and width, sieve plate margin width, single sieve hole size, average sieve hole size, single hole spacing size and average hole spacing size are inspected and qualified, then this batch is qualified; if there is one unqualified piece, the sieve plates should be doubled and the unqualified items should be re-inspected. If they are still unqualified, then this batch is unqualified.
7 Marking, packaging, transportation, storage
7.1 The sieve plates shipped out of the factory must be accompanied by a quality inspection certificate. 7.2 The sieve plates shipped out of the factory should have the manufacturer's registered trademark, and the sieve hole mark can be determined according to the requirements of the demander (user). If the sieve plate has less head and margin, it can be omitted and not printed.
7.3 Anti-rust and moisture-proof measures should be taken when packaging and transporting sieve plates. 7.4 The packaging should be marked on the outside (except for simple packaging), a) Manufacturer's name,
Sieve plate specifications or models:
Sieve plate quantity (sheets):
Box (package) outer corridor dimensions and gross weight;
Factory number and date;
This standard number.
GB/T 12620--2008
Appendix A
(Informative Appendix)
General requirements for heat treatment of sieve plates
A.1 When the user has requirements, the heat treatment of the sieve plates is recommended to adopt carbonitriding, soft nitriding, and low-carbon martensitic treatment processes. When there are special requirements, the supply and demand parties shall negotiate. The general requirements are as follows: A.1.1 Carbonitriding process
Surface hardness: HV100g≥550;
Depth of infiltration layer: 70 μm~170 μm
A.1.2 Soft fluorination process
Hardness of compound layer: HV100g≥550;
Depth of compound layer: 6m~15μm;
Metallurgical structure: A small amount of point-like looseness is allowed on the surface within one-third of the depth of the compound layer. A1.3 Low-carbon martensitic treatment process
Material: It is recommended to use B3 or 20 steel and other materials, which can also be negotiated by both parties; Hardness: HRA≥68, hardness test after grinding 0. 15 mm on the surface 1 Metallurgical structure: The content of non-martensitic structure shall not exceed 5% of the entire structure. A.2 Others
A.2.1 Export sieve plates can be separately specified by both parties according to the trade contract. A, 2.2 Due to the different usage and types of processed materials, the supply and demand parties agree on the heat treatment process and parameters based on the actual usage: 10
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