JB/T 7871.2-1999 JB/T 7871.2-1999 General-purpose and slidable paddy field moldboard plow JB/T7871.2-1999 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
General-purpose and lift-throwing type moldboard ploughs for paddy field
General-purpose and lift-throwing type moldboard ploughs for paddy field-moldboardJB/T7871.2-1999
Replaces JB/T7871.2-95
This standard specifies the types and dimensions, technical requirements and acceptance rules of general-purpose and lift-throwing type moldboard ploughs for paddy field. This standard applies to general-purpose and lift-throwing type zinc-type ploughs for paddy field. 2. Cited standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. At the time of publication of this standard, the versions shown are all 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 Ploughboard dimensions
3.1 The ploughboard dimensions of T-20 and T-25 general-purpose paddy field ploughs shall comply with the provisions of Figures 1 to 6. 3.2 The ploughboard dimensions of Ts-20 general-purpose bar paddy field ploughs and C-25 crossbar paddy field ploughs are shown in Appendix A (suggestive appendix). AA
BB·Rotate the rest
Figure 1 T-20 ploughboard development diagram
Approved by the State Machinery Industry Bureau on September 17, 1999 12
Implemented on January 1, 2000
JB/T 7871.2-1999
Figure 2 T-20 ploughboard surface diagram
Figure 3 T-20 ploughboard sample curve
106 =0
Leave 4T-25 wall expansion diagram
Other installation
BB transfer
4 Technical requirements
JB/T7871.2-1999
Figure 5T-25 wall surface diagram
Figure 6T-25 wall sample curve
4.1 The wall should meet the requirements of this standard and be manufactured in accordance with the drawings and technical documents approved by the prescribed procedures. 4.2 The wall should be manufactured with 65Mn steel or 35# steel specified in GB/T699. 4.3 The wall must be heat treated. The hardness and metallographic structure after heat treatment are as follows: 100.5
a) When made of 65Mn steel, its hardness is 48~56HRC. The metallographic structure is tempered troostite and a small amount of tempered martensite or uniform tempered troostite.
b) When made of 35# steel, its hardness should be greater than 48HRC. The metallographic structure is lath martensite and needle martensite. The hardness of the upper half of the working surface and the tail of the mold wall after heat treatment is allowed to be slightly lower, but not less than 38HRC. The hardness measurement points are as specified in Figure 7,
01 ~ 02
JB/T7871.2-1999
Hardness measurement points
Figure 7 Plow wall hardness measurement points
The working surface of the plow wall should be smooth and should not have defects such as cracks, delamination, burns, etc. There should be no burrs on the edge of the plow wall. 4.5 When checking the plow wall with the sample set, the working surface of the plow wall and the sample set should fit closely, and the local clearance allowed is: 3mm in the sample curve of Articles ⅡI and IV, and 5mm in the sample curve after Article V. 5 Acceptance rules
The plow wall must be inspected and qualified by the quality inspection department of the manufacturer before it can be assembled or the parts can be shipped. 5.1
5.2' The ordering unit can conduct random inspections on the plow wall according to this standard, and the number of random inspections shall be negotiated by both parties. If there are unqualified ones in the random inspection results, double the number of plow walls shall be sampled for re-inspection. If there are still unqualified ones, they will not be accepted. 6 Marking and packaging
The manufacturer's factory mark and plow body type code shall be marked on the non-working surface of the plow wall. 6.1
The working surface of the plow wall shall be coated with rust inhibitor.
When the plow wall leaves the factory, it shall be firmly and neatly bundled in groups and packaged for shipment. Each package should be accompanied by the following documents and marks: 6.4
a) Plowboard code and quantity;
b) Quality inspection certificate;
e) Factory batch number:
d) Manufacturer's name.
JB/T7871.21999
Appendix A
(Suggested Appendix)
Dimensions of plowboards of universal bar-bar paddy field plow and rate-fort paddy field plowA1Ts-20 universal bar-bar paddy field plow and C-25 rate-fort paddy field plowboard are shown in Figures A1 to A8. 141:3
Sample curve diagram
Surface diagram
Surface diagram
Figure A1Ts-20 front plowboardwww.bzxz.net
Sample curve diagram
Figure A2Ts-20 upper bar-bars
Curve Surface
Surface diagram
JB/T7871.21999
Figure A3Ts-20 plow wall middle fence
Figure A4Ts-20 plow wall lower fence
Sample curve diagram
25727a1
Sample curve diagram
JB/T7871.2—1999
Figure A5'C-25 plow wall surface diagram
JB/T7871.2—1999
C-25 rear plow wall sample curve
JB/T 7871.2-1999
Figure A7C-25 Front plowboard
JB/T7871.21999
Figure A8C-25 Front plowboard sample curve
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