This standard specifies the technical requirements, acceptance rules, marking, packaging and transportation of forage seed eyelet drum selectors. This standard applies to forage seed eyelet drum selectors. JB/T 6945.1-1993 Technical requirements for forage seed eyelet drum selectors JB/T6945.1-1993 Standard download decompression password: www.bzxz.net

People's Republic of China
Mechanical Industry Standard
Pellet Feed Press Roller
Technical Conditions
JB/T 6944.21999
Published and issued by the Mechanical Science Research Institute
Printed by the Mechanical Science Research Institute
(No. 2 Shouti South Road, Beijing
Format 880×1230
First edition in April 2000
Printing 1-500
Postal Code 100044)
Sheet 1/2
Words 8.000
First printing in April 2000
Price 5.00 yuan
99-1 362
Machinery: 1. Industry Standard Service Network: http://www.JB.ac.cn Full text reading has ended, download this article requires 9
JB/T6944.2-1999
This standard is a revision of ZBB93020-90 "Pellet Feed Press Press". Compared with ZBB93020-90, the main technical content has changed as follows: 1. GB/T2828-1987 has been added to the referenced standards. 2. The provisions on the materials used in 4.2 have been removed from the technical requirements. 3. The inspection rules have been rewritten.
This standard replaces ZBB93020-90 from the date of implementation. This standard is proposed and managed by the Hohhot Animal Husbandry Machinery Research Institute. The revision of the "Technical Conditions". This standard is different from ZBB93. This standard was drafted by: Hohhot Animal Husbandry Machinery Research Institute, Fuxin Animal Husbandry Machinery Factory. The main drafters of this standard are Hai Yurong, Han Guirong and Li Lijun. Scope
Machinery Industry Standard of the People's Republic of China
Pellet Feed Press Roller
Technical Specifications for Roller Assembly of Pellet MillJB/T 6944.2-1999
Replaces ZBB93020-90
This standard specifies the technical requirements, test methods, inspection rules, packaging and storage and transportation requirements for roller assembly of pellet mill (hereinafter referred to as roller assembly).
This standard is applicable to roller assembly for pressing compound feed and mixed feed. Rollers for pressing other materials may also refer to the implementation of referenced standards
The provisions contained in the following standards constitute the provisions of this standard by reference in this standard. The versions shown are valid at the time of publication of this standard. All standards are subject to revision. Parties using this standard should explore the possibility of using the latest versions of the following standards: GB/T1184--1996
GB/T1800.3—1998
GB/T2828-1987
3 Basic types
3.1 Drawing roller surface:
a) Involute;
b) Rectangular;
c) Trapezoidal.
3.2 Small hole roller surface.
3.3 Narrow groove roller surface.
3.4 ​​Tungsten carbide welded roller surface.
Technical requirements
Shape and position tolerancesUnnoted tolerance values
Basis of limits and fits Part 3: Numerical tables of standard tolerances and basic deviationsBatch-by-batch inspectionCount sampling procedures and sampling tables (applicable to inspection of continuous batches)The rollers shall comply with the requirements of this standard and be manufactured in accordance with the drawings and technical documents approved by the prescribed procedures. 4.1
4.2The rollers shall be heat treated and shall meet the following requirements:The hardness of the volumetric heat treatment is 52~63HRC, and the depth of the hardened layer is not less than 4mm. 4.3The dimensional accuracy of the inner hole matching surface of the roller shall not be lower than IT7 grade specified in GB/T1800.3. 4.4The coaxiality tolerance of the outer surface of the roller and the inner hole bearing mounting matching surface shall not be lower than Grade 8 specified in GB/T1184. 4.5The R value of the surface roughness of the inner hole matching surface of the roller is 1.6μm. 4.6The rollers shall not have defects such as micro cracks and interlayers. 4.7
The surface of the press roll should not have flash, burrs, oxide scale, etc. Approved by the State Bureau of Machinery Industry on August 6, 1999 and implemented on January 1, 2000
4.8 The surface of the press roll should be coated with anti-rust oil.
JB/T6944.2-1999
Under normal working conditions, the working time of the press roll shall not be less than 300 hours. 4.9
Test method
The test instruments, meters, measuring tools and testing tools shall be calibrated. 5.2 Check the dimensional tolerance of the press roll with a universal measuring tool. Check the surface roughness of the press roll with a surface roughness comparison sample. 5.3
Each press roll surface should be hardened at three locations where the circumference is divided into three equal parts, with no less than 2 points at each location. 5.4
5.5· Check 4.6.4.7 and 4.8 by visual inspection. 5.6 The service life of the roller can be assessed by the user. Under rated working conditions, the cumulative working time of the roller is measured in hours. 6
Inspection rules
The inspection of the roller is divided into factory inspection and type inspection. 6.1 Factory inspection
For rollers produced in batches, when the batch range is N=91~150 units, factory inspection shall be carried out in accordance with the provisions of Table 1. 6.1.1
Item Number of months
Inspection level
Sample size
4.2, 4.4
6.1.2 The roller may be shipped only after it has passed the inspection of the quality inspection department of the manufacturer. 6.2 Type inspection
6.2.1 Type inspection shall be conducted in any of the following cases: a) when new materials are replaced;
b) every two years in normal production;bzxZ.net
c) when there are major changes in structure and process after normal production; d) when the national quality supervision agency requires type inspection. 6.2.2 During type inspection, when the batch range N=16~25 units, it shall be conducted in accordance with the provisions of Table 2. 6.3 Sampling plan
4.3, 4.5, 4.6, 4.7.4.8
6.3.1 Sampling inspection shall be conducted in accordance with the normal inspection and one-time sampling plan specified in GB/T2828. The inspection level is general inspection level I. Samples shall be randomly selected from the finished product warehouse.
6.4 Evaluation rules
Self-classification of items
Number of items
Inspection level
Sample size
Ac, Re
JB/T6944.2-1999
4.2，4.4.4.9
4.5，4.6，4.7.4.8
Evaluate item by item. When the number of unqualified items in the sample is less than or equal to the qualified judgment number Ac, it is judged as qualified. When the number of unqualified items is greater than or equal to Re, it is judged as unqualified. If all categories are qualified, it is finally judged as qualified. If any category is judged as unqualified, it is finally judged as unqualified. 7 Marking, packaging, transportation and storage
7.1 Every 4 rollers are packed in a wooden box. With the consent of the user, other materials can also be used for packaging, but it must be ensured that the rollers are intact during transportation and storage.
7.2 The packaging must be firm and reliable and meet the requirements of the transportation management department. 7.3 The following markings should be on the outside of the packaging box:
a) Product name and specifications;
b) Total mass, kg;
c) Overall dimensions (length × width × height), mm; d) Manufacturer's name;
e) Receiving unit and destination.
7.4 The rollers should be stored indoors and have rain and moisture-proof facilities. 7.5
The markings and packaging of exported rollers should comply with the regulations of the foreign trade department. The rollers should be accompanied by a product certificate when leaving the factory.
Standards of the People's Republic of China
Mechanical Industry Standards
Pellet Feed Press Rollers
Technical Conditions
JB/T 6944.21999
Published by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2, Shouti South Road, Beijing
Format: 880×1230
Postal Code: 100044)
Printing Sheet: 1/2
Word Count: 8.000
First Edition in April 2000
Print Quantity: 1-500
First Printing in April 2000
Price: 5.00 Yuan
991362
Mechanical Industry Standards Service Network: http://www.JB.ac.cn6612698
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.