JB/T 7871.3-1999 This standard is a revision of JB/T 7871.3-95 "General-purpose and slash-type paddy field plowshares". During the revision, only editorial changes were made according to relevant regulations, and the main technical content remained unchanged. This standard stipulates the types and dimensions, technical requirements and acceptance rules of general-purpose and slash-type paddy field plowshares. This standard is applicable to general-purpose and slash-type paddy field plowshares. This standard was first issued in 1977 as NJ 157-77, first revised in 1986 as GB 6248.3-86, and adjusted to JB/T 7871.3-95 in April 1996. JB/T 7871.3-1999 General-purpose and ploughshare for paddy fields JB/T7871.3-1999 Standard download decompression password: www.bzxz.net

Machinery Industry Standard of the People's Republic of China
Type of plowshare
General-purpose and lift-throwing type moldboard ploughs for paddy field-shareJB/T7871.3-1999
Replaces JB/T7871.3-95
This standard specifies the type and size, technical requirements and acceptance rules of general-purpose and lift-throwing type paddy field plowshares. This standard applies to general-purpose and lift-throwing type paddy field plowshares. 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/T699—1999
High-quality carbon structural steel
3 Types and sizes
General-purpose and cross-fort-type paddy field plowshares are chisel-shaped plowshares. The dimensions and sample curves of general chisel-shaped plowshares are shown in Table 1 and Figures 1 to 5: 3.1
The dimensions of cross-fort-type chisel-shaped plowshares are shown in Appendix A (suggestive appendix). Table 1
Approved by the State Machinery Industry Bureau on September 17, 1999 22
T-20, Ts-20
Implemented on January 1, 2000
Note: The double-dotted dash line edge in the figure is the Ts-20 plowshare edge. 20
JB/T7871.31999
General zinc expansion diagram
Figure 2T-20, Ts-20 zinc pressure diagram
4 Technical requirements
JB/T7871.31999
T-20, Ts-20 ploughshare sample curve
Figure 4T-25 ploughshare pressure diagram
Figure 5T-25 ploughshare sample curve
4.1 Ploughshares shall be made of 65Mn steel or periodic rolled ploughshare steel specified in GB/T699. V
4.2 Ploughshares must be heat treated. According to Figure 6, the hardness of the heat-treated zone should be 50~60HRC, and the metallographic structure should be fine needle-shaped and medium-fine needle-shaped (or fine lath-shaped and medium-fine lath-shaped) tempered martensite, or tempered troostite, or a mixed structure. The hardness of the non-heat-treated area shall not be higher than 33HRC.
4.3 The thickness of the straight part of the plow blade should be 1±0.5mm, and the thickness within 60mm of the plow tip (chisel-shaped part) is allowed to be 2mm. 4.4 The working surface of the plowshare should be smooth, and the plow zinc should not have defects such as cracks, delamination, burns, etc. 4.5 There should be no burrs on the edge of the plowshare.
4.6 When checking the model with the sample group, the working surface of the plowshare should fit closely with the sample group, and the local gap allowed is: 1.5mm for the seam edge, 24
and 2mm for the rest c
Acceptance ruleswwW.bzxz.Net
Heat-treated leather
JB/T7871.3-1999
Hardness measurement points
Figure 6 Heat-treated belt of plowshare
5.1 The plowshare must be inspected and qualified by the technical inspection department of the manufacturer before it can be assembled or the parts can be shipped. 5.2 The ordering unit can conduct random inspections on the plowshare according to this standard, and the number of random inspections shall be negotiated by both parties. If there are unqualified results in the random inspection, the number shall be doubled for re-inspection. If there are still unqualified ones, they will not be accepted. 6
Marking and packaging
6.! The non-working surface of the plowshare should be marked with the manufacturer's factory logo and model code. 6.2 The working surface of the plowshare should be coated with anti-rust agent.
6.3 When the plowshare leaves the factory, it should be firmly and neatly bundled in groups and packed for shipment. 6.4 Each package should be accompanied by the following documents and marks: a) plowshare code and quantity;
b) quality inspection certificate;
c) factory batch number;
d) manufacturer's name.
JB/T7871.31999
Appendix A
(Suggested Appendix)
Fort-type chisel-shaped zinc
The dimensions of the fort-type chisel-shaped plowshare are shown in Figures A1 to A3. 333
C-25 plowshare expansion diagram
Figure A2C-25 plowshare compression diagram
Figure A3C-25 plowshare sample curve
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