This standard specifies the type and basic parameters, technical requirements, inspection methods and acceptance rules, marking, packaging, transportation, storage and quality assurance of the filter screen (hereinafter referred to as the filter screen) in the drum of the piston pusher centrifuge. This standard is applicable to welded bar screens, serial bar screens and milled plate screens for piston pusher centrifuges. JB/T 8865-2001 Filter screen for piston pusher centrifuge JB/T8865-2001 Standard download decompression password: www.bzxz.net

JB/T8865-2001
This standard is a revision of JB/T8865--1999 (formerly ZBJ77003--88) "Strip nets for horizontal piston pusher centrifuges". The technical content of milled plate nets has been added, and the content of strip nets in the original standard has been edited. The main technical content of the strip nets has not changed. This standard replaces JB/T8865-1999 from the date of implementation. This standard is proposed and managed by the National Technical Committee for Standardization of Separation Machinery. The responsible drafting unit of this standard: Chongqing Jiangbei Machinery Factory. The main drafter of this standard: Zhao Hongliang.
This standard was first issued as JB448 in 1964, revised for the first time as ZBJ77003--88 in July 1988, and adjusted to JB/T8865-1999 in 1999. This is the second revision. 532
1 Scope
Machinery Industry Standard of the People's Republic of China
Screen for pusher centrifuge
Screen for pusher centrifugeJB/T 8865—2001
Replaces JB/T8865—1999
This standard specifies the type and basic parameters, technical requirements, inspection methods and acceptance rules, marking, packaging, transportation, storage and quality assurance of the filter screen in the drum of piston pusher centrifuge (hereinafter referred to as the filter screen). This standard applies to welded bar screens, serial bar screens and milled plate screens for piston pusher centrifuges. 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 parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T342-1997 Size, shape, weight and allowable deviation of cold-drawn round steel wire, square steel wire and hexagonal steel wire GB/T13306-1991 Label
GB/T13384--1992 General technical conditions for packaging of electromechanical products 3 Product classification
The filter screens described in this standard are divided into three categories according to their forming methods: welded bar screens, series-connected bar screens and milled plate screens. The welded bar screens are composed of bar screens, ribs and pressure strips (see Figure 1); the series-connected bar screens are composed of bar screens, pressure strips, tension screws and nuts (see Figure 2); the milled plate screens are made by mechanical processing (see Figure 3).
Approved by China Machinery Industry Federation on April 3, 2001Z
Schematic diagram of welded bar net
Implementation on October 1, 2001
Types and basic parameters
JB/T 8865-
Tension screw and nut
Figure 2 Schematic diagram of serially connected bar net
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Figure 3 Schematic diagram of milled plate net
4.1 The cross-sectional shapes of the bars of welded bar net and serially connected bar net are recommended to adopt the two types shown in Figure 4, and other types of cross-sectional shapes may also be used.
4.2 The basic dimensions and limit deviations of the back width B and cross-sectional fillet R of welded and serially connected bar nets shall comply with the provisions of Table 1 Table 1
Basic dimensions
Limit deviation
Basic dimensions
Limit deviation
1.18,1.32,1.50,1.70
1.90.2.12,2.36,2.65,3.00
JB/T 8865--2001
4.3 The gaps, gap deviations and qualified rate of the bar nets shall comply with the provisions of Table 2. Table 2
Basic gap dimensions/mm
Gap deviation/mm
Qualified rate/%Www.bzxZ.net
4.4 The distance between the tensioning screws and the rib spacing M shall be 50, 70, 85 mm. Individual entanglement gap
Limit deviation/mm
4.5 The gap, gap deviation and qualified rate of the milled plate mesh after bending and forming shall comply with the requirements of Table 3. Table 3
Basic size of gap/mm
4.6 Method of indicating filter model
Welded strip mesh
Gap deviation/mm
Qualified rate/%
Limit deviation/mm
Total number of elements/%
Total number of elements/%
4.6.2 Serial strip mesh
4.6.3 Milled plate mesh
4.7 Marking example
JB/T 8865--2001
Basic size of gap width × 102, mm
Basic size of strip back width × 102, mm
-Welded strip mesh
Piston push centrifuge
Basic size of gap width × 10°, mm
Basic size of mesh strip back width × 10°, mm
Serial strip net
Piston push centrifuge
Basic size of gap width × 10°, mm
Milled plate net
Piston push centrifuge
a) Welded strip net for piston push centrifuge with basic size of mesh strip back width of 1.50 mm and basic size of gap width of 0.15 mm:
HH150-15 piston push centrifuge Filter screen JB/T8865-2001b) Serial bar screen for piston push centrifuge with basic size of 1.90mm back width and 0.25mm gap width:
HC190-25 Filter screen for piston push centrifuge JB/T8865-2001c) Milling plate screen for piston push centrifuge with basic size of 0.25mm gap width: HX25 Filter screen for piston push centrifuge JB/T8865-20015 Technical requirements
5.1. Filter screen for piston push centrifuge shall meet the requirements of this standard and be manufactured according to the drawings and technical documents approved by the prescribed procedures. 5.2 The filter screen material used shall meet the corresponding material standards and shall have the supplier's quality certificate. If there is no certificate, the filter screen manufacturer shall inspect the raw materials and only those that meet the requirements can be used. The material used for the ribs of the welded bar screen shall be the same as that used for the bar. The filter material used for food filtration shall comply with the relevant provisions of the Food Hygiene Law. 5.3. The surface of the raw material metal wire used to make the mesh should be smooth and no twists are allowed. The diameter tolerance of the cold-drawn round steel wire used to make the mesh shall not be lower than the tolerance level 10 specified in GB/T342. 5.4 The working surface roughness Ra of the milled plate mesh shall not be lower than 1.6μm. The working surface roughness Ra of the mesh and pressure strips of the bar mesh shall not be lower than 3.2μm.
5.5 All welding points of the welded bar mesh shall be welded firmly and thoroughly, without defects such as undercut, cracks and leakage, and the welding slag shall be removed. 5.6 The working surface roughness Ra of the tightening screw thread of the serial bar mesh shall not be lower than 6.3μm. 5.7 The working surface of the filter mesh shall be flat and smooth, without cracks, flash and burrs. The height deviation of the working surface of any two adjacent strips in the strip net shall not exceed 0.10mm, and the maximum height deviation of the working surface of the strips on the entire working surface of the strip net shall not exceed 0.25mm. The number of twisted and bent strips shall not exceed 2% of the total number of strips. 5.8 After forming the arc-shaped slat net, the error of the two diagonals of each strip net shall not exceed one thousandth of the actual measured size. 5.9 Each arc-shaped slat net shall be balanced after weighing. The weight difference between the two symmetrically arranged arc-shaped slat nets in each set of strip nets shall not exceed 0.2% of the weight of the heavier arc-shaped slat net, and the weight difference between any two semicircular strip nets symmetrically arranged at 180° to each other shall not exceed 0.2% of the weight of the heavier arc-shaped slat net. 536
6 Inspection methods and acceptance rules
JB/T8865—2001
6.1 The manufacturer shall inspect the filter to ensure that all the filter nets shipped meet the requirements of this standard. The user has the right to conduct acceptance according to this standard.
6.2 Inspection and acceptance of strip nets
6.2.1 Take a batch of strip nets for piston push centrifuges as a batch unit. 10% of each batch of strip nets and pressure strips should be extracted for the following inspections: a) Measure the back width of the strips. Use a micrometer to measure three places along the length of the strips. The three places should be evenly distributed. The measurement results should comply with the provisions of Table 1.
b) Measure the fillet size of the strips. Use a special sample gauge to measure three places along the length of the strips. The three places should be evenly distributed. The measurement results should comply with the provisions of Table 1.
c) Measure the working surface roughness of the strips and pressure strips. Use a roughness comparison sample block to measure. The measurement results should comply with the provisions of 5.5. 6.2.2 After the strip net is assembled, a piece of arc-shaped strip net should be taken out from each strip net for piston push centrifuge for the following inspections: a) Check the qualified rate of the strip net gap. Use a feeler gauge to measure three parts on the working surface of the strip net. Each part is measured 100 places in a row along the direction parallel to the rib generatrix or the axis of the tensioning screw. The measurement results should comply with the provisions of Table 2. b) Check the height deviation of the working surface of two adjacent strips of the strip net. Use a depth gauge or a dial indicator to measure 10 places on the working surface of the strip net. The 10 places should be evenly distributed. The measurement results should comply with the provisions of 5.8. c) Check the maximum height deviation of the working surface of the strip net on the working surface of the strip net. Use a depth gauge or a dial indicator to measure. The measurement results should comply with the provisions of 5.8.
d) Check the diagonal deviation of the strip net. Use a vernier caliper to measure. The measurement results should comply with the provisions of 5.9. 6.3 Inspection and acceptance of milled plate mesh
6.3.1 Determine the working surface roughness of the milled plate mesh using a roughness comparison sample. The measurement result shall comply with the provisions of 5.5. 6.3.2 Check the pass rate of the gaps of the milled plate mesh. After the milled plate mesh is bent and formed according to the specified drum inner diameter, use a feeler gauge to measure 50 points on the curved surface of the milled plate mesh at random and calculate. The measurement result shall comply with the provisions of Table 3. When the number of gaps on a single milled plate mesh is less than 50, it is allowed to use 50 points on two milled plate meshes to calculate the pass rate of the gaps. 7 Marking, packaging and storage
7.1 The factory products shall be labeled in a conspicuous position on the packaging box. The type and basic size of the label shall comply with the provisions of GB/T13306. The content is:
a) Name of the receiving station and receiving unit;
b) Filter model, specification and quantity;
c) Manufacturer name and date of manufacture;
d) Box number, external dimensions and gross weight.
7.2 The filter shall be cleaned before wrapping or packing, and the box shall be lined with waterproof material. 7.3 The wrapping or packing of the filter shall comply with the provisions of GB/T13384, and shall be accompanied by a packing list and product certificate. 7.4 The filter shall generally be stored indoors and leveled so as not to be in direct contact with the ground. 8 Quality Assurance Period
If the user complies with the storage, transportation, installation and use rules, and the filter is damaged or fails to work properly due to unqualified manufacturing quality, the manufacturer shall be responsible for repairing or replacing it for the user.
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