JB/T 6944.2-1999 This standard is a revision of ZB B93 020-90 "Technical conditions for rollers of pellet feed presses". The main technical content changes are as follows: - Added reference standard GB/T 2828-1987; - Removed the provisions on the materials used in the technical requirements, and re-wrote the inspection rules. This standard specifies the technical requirements, test methods, inspection rules, packaging and storage and transportation requirements for rollers of pellet feed presses. This standard is applicable to rollers for pressing compound feed and mixed feed. Rollers used to press other materials can also be implemented as a reference. This standard was first issued on May 28, 1990. JB/T 6944.2-1999 Technical conditions for rollers of pellet feed presses JB/T6944.2-1999 Standard download decompression password: www.bzxz.net

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4.8 The surface of the compression should be coated with anti-rust oil.
JB/T6944.2-1999
Under normal working conditions, the working time of the roller shall not be less than 300h. 4.9
Test methodbzxZ.net
The test instruments, meters, measuring tools and detection tools shall be calibrated. 5.2 Use universal measuring tools to check the dimensional tolerance of the roller. Use surface roughness comparison sample to check the surface roughness of the roller. 5.3
The surface of each roller shall be hardened at 3 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 Rollers may be shipped only after they have passed the inspection of the quality inspection department of the manufacturer. 6.2 Type inspection
6.2.1 Type inspection shall be carried out in one of the following cases: a) when new materials are replaced;
b) every two years during normal production;
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 When type inspection is carried out and the batch range is N=16~25 units, it shall be carried out 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 The inspection level of the normal inspection sampling plan specified in GB/T2828 is the general inspection level I. Samples should 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. All categories are qualified and finally judged as qualified. Any category is judged as unqualified and 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 the rollers must be 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 weight, 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 marking and packaging of the exported rollers should comply with the regulations of the foreign trade department. The rollers should be accompanied by product certificates when leaving the factory.
People's Republic of China
Mechanical Industry Standard
Pellet Feed Press Roller
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
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