This standard specifies the general tolerances of welded structures. This standard applies to the processing of welded structures of electrical equipment. JB/T 6753.4-1993 Electrical equipment equipment component tolerances welded structure general tolerances JB/T6753.4-1993 Standard download decompression password: www.bzxz.net

1 Subject content and scope of application
Machinery industry standard of the People's Republic of China
Equipment structure tolerance of electrical equipment
General tolerance of welded structure
This standard specifies the general tolerance of welded structure. This standard applies to the processing of equipment structure of welded structure of electrical equipment. Reference standards
'JB/T6753.4—93
JB/T6753.1 Equipment structure tolerance of electrical equipment General tolerance of sheet metal parts and structures and their selection rules 3 Terms
3.1 Height
The size of the equipment in the Z axis (up and down) direction of the three-dimensional coordinates. 3.2 Width
The size of the equipment in the X axis (left and right) direction of the three-dimensional coordinates. 3.3 Depth
The size of the equipment in the Y axis (front and back) direction of the three-dimensional coordinates. 4
General tolerance
General tolerances for height, width and depth are divided into two levels, A and B. The limit deviation values ​​are shown in Table 14.1
Dimensional segmentation
>120~400
>400~1000
>1000~2000
>2000~4000
4.2 The general tolerance for verticality of welded structures shall adopt the general tolerance B or C level for verticality in Table 2, Chapter 4 of JB/T6753.1. 4.3 The same gap or parallel gap (referring to parallel gaps with the same gap size) formed between structural cables on the surface of welded structures (such as doors and doors; doors and other structural cables, etc.) shall be uniform. The gap difference shall not exceed the value specified in Table 2. Approved by the Ministry of Machinery Industry on August 21, 1993
Implemented on October 1, 1993
≤1000
Basic size is the shorter side size of the formed steel plate JB/T 6753. 493
Parallel gap
: The general tolerance of the flatness of panel, side panel, door panel and other plate components is 3mm per square meter. 4.4bzxz.net
5 Marking
Conforms to the provisions of Chapter 9 of JB/T6753.1.
Additional remarks:
This standard is proposed and managed by Beijing Electric Engineering Comprehensive Technology and Economic Research Institute. This standard is drafted by Tianjin Electric Drive Design Institute, Xuchang Relay Research Institute, Shenyang Low Voltage Switch Factory and Shanghai Huatong Switch Factory. Shanghai Electric Complete Plant Factory, Kunming Switch Factory, Beijing Second Switch Factory and Guangzhou Nanyang Electric Factory participated in the drafting. The main drafters of this standard are Guo Xiaohu, Du Zhongyao, Zhou Guixin, Wang Aimin and Shen Zhidong.
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