This standard specifies the type and basic parameters, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of coal-through-slot sieve plates. This standard applies to sieve plates used in screening machines such as fixed coal screens and vibrating screens. JB/T 2447-1992 Coal-through-slot sieve plates (through-slot type) JB/T2447-1992 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T2447-92
Slotted Screen Plate for Coal (Strip-through Type)
Published on July 14, 1992
Implementation by the Ministry of Machinery and Electronics Industry of the People's Republic of China on July 1, 1993
Mechanical Industry Standard of the People's Republic of China
Slotted Screen Plate for Coal (Strip-through Type)
Subject Content and Scope of Application
JB/T2447-92
Replaces JB2447-78
This standard specifies the type and basic parameters, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of slotted screen plates for coal (hereinafter referred to as screen plates). This standard applies to screen plates for screening machines such as fixed screens and vibrating screens for coal. 2 Reference standards
GB2828
Batch inspection counting sampling procedures and sampling tables (applicable to continuous batch inspection) JB/T2446 Coal dewatering screen bars
3 Types and basic parameters
3.1 The screen plate is composed of screen bars, wear bars, flat steel and other units. Its structure has two types of prestressed (Y type) and non-prestressed (W type) assembled as a whole, as shown in Figure 1 and Figure 2.
Prestressed screen plate Y type
Figure 2 Non-prestressed screen plate W type
Approved by the Ministry of Machinery and Electronics Industry on July 14, 1992 and implemented on July 1, 1993
JB/T2447--92
3.2 Screen bars for screen plates are recommended to be manufactured using the screen bar types listed in JB/T2446. 3.3 Main parameters of screen plate The screen slot width and screen bar back width should refer to the sizes listed in Table 1. Table 1
Screen slot width
0.25~1.00
1.25~3.00
4.00~6.00
6.00~16.00
Note: Other screen slot widths and screen bar back widths can be selected by negotiation between the purchaser and the manufacturer. 3.4 Sieve plate code and marking example
3.4.1 Sieve plate code
Sieve bar back width
1.50~2.20
2.40~2.80
3.00~3.50
JB/T2447
Standard number
Type (Y)
Height, mm
Width, mm| |tt||Length, mm
Sieve slot width, mm
Sieve bar back width, mm
Sieve bar type (A type, B type, C type)
3.4.2 Marking example
B type screen bar, screen bar back width is 2.20mm, screen slot width is 0.50mm, screen plate length is 1330mm, screen plate width is 408mm, screen plate height is 40mm, Y-type screen plate.
Sieve plate B-2.20×0.50×1330×408×40YJB/T2447 Technical requirements
The screen plate shall comply with the requirements of this standard and shall be manufactured in accordance with the drawings and technical documents approved by the prescribed procedures. 4.1
4.2 The working surface of the screen plate shall be flat and smooth, and the height difference between the working surfaces of each screen bar shall not exceed 0.3mm. 4.3 The surface roughness of the screen plate is 1%
4.4 The length deviation, width deviation and two diagonal errors of the screen plate after assembly shall comply with the provisions of Table 2. Table 2
Screen plate length dimension L
>600~1600
>1600~2500
>2500~5000
Length deviationbzxZ.net
Screen plate width dimension B
≤200
>200～600
>600～1000
>1000~2000
Width deviation
Two diagonal errors
4.5 The screen seam of the screen plate after assembly shall comply with the provisions of Table 3. Screen seam
Basic size
8.00~16.00
Limit deviation
JB/T2447—92
% of total
4.6After assembly, the screen plate is painted with anti-rust paint except for stainless steel. 5 Test method
Limit deviation
% of total
Seam deviation
% of total
5.1The raw materials for manufacturing the screen plate should have a quality certificate from the supplier. If there is no certificate of conformity, the screen plate manufacturer should inspect the raw materials and only qualified ones can be used.
5.2The height difference between the working surfaces of each screen bar of the screen plate is measured with a depth gauge with a scale value of 0.05mm. It should be measured at 10 places close to the axis of the rod, and the 10 places should be evenly distributed.
5.3The roughness of the working surface of the screen plate is visually compared with the roughness sample. 5.4 The length and width deviation of the screen plate and the error of the two diagonals are measured with a steel tape measure with a scale value of 1mm. 5.5 The screen gap of the screen plate is measured in three parts on the screen surface with a feeler gauge or a reading microscope. Each part should be evenly distributed on the screen surface. When the screen gap is less than or equal to 1.5mm, 100 screen gaps are measured continuously in each part. When the screen gap is greater than 1.5mm, 50100 gaps are measured continuously in each part. 6
Inspection rules
The screen plate should be inspected before delivery, and the items are as follows: a.
The raw materials of the screen plate should have a quality certificate from the supplier or a physical and chemical test record of the raw materials by the manufacturer: The height difference between the working surfaces of the screen bars of the screen plate should meet the requirements of Article 4.2; b.
The roughness of the working surface of the screen plate should meet the requirements of Article 4.3; The length and width deviation of the screen plate and the error of the two diagonals should meet the requirements of Table 2: d.
The screen gap of the screen plate should meet the requirements of Table 3.
6.2 The user has the right to accept the product according to this standard. The acceptance shall be carried out by one or two sampling plans, which shall comply with the provisions of GB2828.
7.1
7.1.1 The product shall have a product certificate, which includes: a. Product name;
Product model;
Factory date or production date;
Inspection date and inspector's stamp;
Manufacturer name
The surface of the product outer packaging shall be marked with:
Receiving station name, receiving unit;
Shipping station name, shipping number;
Product name, quantity, specifications;
Manufacturer name.
7.2
JB/T244792
7.2.1 The outer packaging of the product can be made of wooden boxes or other packaging materials. 7.2.2 Each outer package must be accompanied by a product certificate. 7.3 Transportation and storage
7.3.1 Rain and moisture-proof measures should be taken during transportation. 7.3.2 It should be stored in a dry and non-corrosive place. 8 Manufacturing guarantee
8.1 The manufacturer should ensure that the product meets the requirements of this standard when it leaves the factory. 8.2 If the user complies with the transportation, installation and reasonable use rules, the manufacturer shall be responsible for repairing or replacing the screen plate if it is damaged or cannot be used normally within 6 months from the date of shipment from the manufacturer and within 3 months of use. Additional notes:
This standard was proposed by the National Technical Committee for Mining Machinery Standardization. This standard is under the jurisdiction of the Luoyang Mining Machinery Research Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by Shanghai Mine Screen Factory. The main drafter of this standard is Zhuo Yunming.
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