This standard specifies the type, main parameters and dimensions, technical requirements, test methods, acceptance rules, marking and packaging of double disc openers used in grain seeders. This standard applies to double disc openers used in grain sowing of crops such as grain and soybeans. JB/T 6274.2-1992 Double disc openers for grain seeders JB/T6274.2-1992 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T6274.2—92
Grain Seeder
Published on June 10, 1992
Double Disc Furrow Opener
Implemented on July 1, 1993
Published by the Ministry of Machinery and Electronics Industry of the People's Republic of China
Mechanical Industry Standard of the People's Republic of China
Grain Seeder
Double Disc Furrow Opener
Subject Content and Scope of Application
JB/T6274.2—92
This standard specifies the type, main parameters and dimensions, technical requirements, test methods, acceptance rules, marking and packaging of double disc furrow openers used in grain seeders.
This standard applies to double disc furrow openers (hereinafter referred to as furrow openers) used in grain seeders for sowing crops such as grain and soybeans. 2 Reference standards
GB9478
GB9439
GB7040
GB2828
Test methods for grain seed drills
Rolling bearingsDeep groove ball bearings with sealsDimensionsTechnical conditions for high-quality carbon structural steel
Gray cast iron parts
Rubber for lip seals of rotating shafts
Painting of agricultural machinery
Batch inspectionCount sampling procedures and sampling tables (applicable to inspection of continuous batches)Types, main parameters and dimensions
Ditch openers are divided into two types according to the diameter of the disc: Type 1
The disc diameter is 300mm;
The disc diameter is 350mm.
3.2 Ditch openers are manufactured into 9 structural forms according to their structure and purpose as specified in Table 1. 3.3 The main parameters and dimensions of the furrow opener shall comply with the requirements of Figure 1 and Table 1. 3.4 The furrow opener can be made into front row and rear row
Approved by the Ministry of Machinery and Electronics Industry on June 10, 1992 B
Implementation on July 1, 1993
Structural type
4 Technical requirements
Rolling bearings
Sliding bearings
Rolling bearings
Sliding bearings
Disc diameter
JB/T6274.2—92
11°38
Cereal and soybean drills
Cereal narrow row drills
Cereal and soybean drills
Cereal narrow row drills
4.1 The furrow opener shall comply with the requirements of this standard and be manufactured according to the drawings and technical documents approved by the prescribed procedures. 4.2 The new design of large and medium-sized seed drills should use sealed rolling bearings to ensure normal operation at an operating speed of 8 to 15 km/h. The rolling bearings used should comply with the provisions of GB279. 4.3 The opener disc should be made of 65Mn steel specified in GB699, with a heat treatment hardness of 40 to 50HRC, a flatness tolerance of 2mm, and dimensions that meet the requirements of Figure 2 and Table 2. It is allowed to use other materials with performance not lower than the above materials. 60°
Figure 2 Furrow opener flat disc
d—outer diameter; dr—center hole diameter; dr—connection hole diameter; dconnection hole center circle diameter: sthickness
4.4 The disc hub shall be made of steel plate stamping structure, or it may be made of HT150 gray cast iron not less than that specified in GB9439. 4.5 The furrow opener body shall be made of HT150 gray cast iron not less than that specified in GB9439, or it may be made of stamping and welding structure. 4.6 The newly designed furrow opener shall have a follow-up scraper that fits tightly against the furrow opener disc, and its pressure shall be adjustable. The gap between the edge of the fixed scraper and the inner plane of the disc shall not be greater than 2mm.
4.7 The furrow opener sealing ring shall ensure the protection of the bearing cavity, and the physical and mechanical properties of the rubber used as the sealing diagram shall comply with the provisions of GB7040. 4.8 The opener disc should rotate flexibly. The tangential force of the opener should be no more than 50N when the disc diameter is 350mm and no more than 60N when the disc diameter is 300mm.
300±1
350±1
Sliding bearing
JB/T6274.2—92
Rolling bearing
Note: ① The position accuracy of the center of the connecting hole is 0.2.? Stamping disc Yiqushan-65, casting disc Yiqud-726.5
Sliding bearing
Rolling bearing
4.9 The two discs intersect at point C (see Figure 1), and the gap at the intersection is no more than 2mm. When the two discs rotate relative to each other, the gap at the intersection should be no more than 4mm.
4.10 The two discs should be symmetrically distributed relative to the opener body. The symmetry tolerance of the intersection of the two discs relative to the symmetry plane of the opener body is 8mm. The gap between the two discs and the opener body should be no less than 2mm4.11
4.12 The overlap at the intersection of the two discs should not exceed 3mm. 4.13 The paint of the opener should be painted in accordance with the provisions of NJ/Z3, and a black ordinary weather-resistant coating TQ-1-BP should be applied. 5 Inspection methods and acceptance rules
5.1 The manufacturer shall conduct regular inspections of the openers in accordance with the provisions of this standard. It shall not be less than once a year, and the number of inspected openers shall not be less than 5. 5.2 The ordering unit has the right to conduct random inspections of the openers in accordance with the provisions of this standard in accordance with GB2828. The sampling plan and qualified quality level shall be determined by negotiation between the supply and demand parties.
5.3 The opener should generally be installed on the seed drill and tested in accordance with GB94785.4 The flatness of the opener disc is measured on the platform with a height vernier. The hardness of the disc is measured by a hardness tester. Take 3 to 4 equidistant points on the disc with a point spacing of 40 to 60 mm and measure away from the cutting edge. 6 Marking and packaging
6.1 The code of the part and the trademark of the manufacturer should be marked on the surface of the cast parts of the trencher. The mark of "front" or "rear" should be cast on the body of the cast trencher.
6.2 The packaging of the trencher should be firm and reliable to ensure that it will not be damaged or lost during normal loading and unloading, transportation and storage. 6.3 Each packaging part should be accompanied by a product quality certificate, which should indicate the product name, model, signature and date of the inspector. 6.4 The outside of each package should be marked with:
a. Name and address of the manufacturer;
b. Product name, model and trademark;
Product quantity;
Date of manufacture.
Additional instructions:
This standard is proposed and managed by the Chinese Academy of Agricultural Mechanization Sciences. This standard was drafted by the Chinese Academy of Agricultural Mechanization Sciences. The main drafters of this standard are Shen Yongning and Chen Junbao. People's Republic of China
Mechanical Industry Standard
Grain Seeder
Double Disc Opener
JB/T6274.2-92
Published by the Mechanical Standardization Research Institute of the Ministry of Machinery and Electronics Industry Printed by the Mechanical Standardization Research Institute of the Ministry of Machinery and Electronics Industry (P.O. Box 8144, Beijing 100081)
Copyright reserved. No reproduction allowed
Format 880×1230
Print Sheet 3/8
Number of Words 6,000
First Printing in June 1993bZxz.net
First Edition in June 1993
Print 00.001-500
Price 1.20 Yuan
No. 0893
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