This standard specifies the technical requirements, contact types and inspection rules for the main circuit contacts of directly controlled electrical appliances in industrial and mining electric locomotives for narrow-gauge railway transportation. This standard applies to the main circuit contacts of directly controlled electrical appliances in industrial and mining electric locomotives for narrow-gauge railway transportation. JB/T 3270-1991 Dimensions and technical conditions of the main circuit contacts of narrow-gauge industrial and mining electric locomotives JB/T3270-1991 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T3270
1991-06-27
1992-07-01Xiaohuang
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1 Subject content and scope of application
JB/T3270
JB327083
This standard specifies the technical requirements, contact types and inspection rules for the main circuit contacts of the direct control electrical appliances in industrial and mining electric locomotives for narrow-gauge railway transportation.
This standard applies to the main circuit contacts of the direct control electrical appliances in industrial and mining electric locomotives for narrow-gauge railway transportation. 2 Reference standards
Standardization work guidelines This regulation prepared by the standard GB2828 Batch inspection counting sampling procedures and sampling tables GB1804 Tolerances and fits Limit deviations of dimensions without tolerances YB145 Chemical composition of pure copper processed products. 3 Technical content
3.1 Technical requirements
3.1. 1 The material of the contact is pure and marked as T2-Y. 3.1.2 The chemical composition of the contact material shall comply with the provisions of YB145. 3.1.3 The hardness of the contact surface shall not be less than HB60. 3.1.4 The contact surface shall be silver-plated.
3.1.5 The shape and size of the contact shall be as shown in Figures 1 to 4. The limit deviations of dimensions without tolerances shall be in accordance with GB1804. The length shall be JS (or jg) 14 grade and the hole shall be H14 grade.
3.2 Contact categories
3.2.1 Contacts are divided into butt-jointed contacts and sliding finger contacts: butt-jointed contacts are used for single-breakpoint rotary contact systems, and sliding finger contacts are used for stationary contacts in sliding drum contact systems. 3.2.2 The specifications and series dimensions of butt-jointed contacts and sliding finger contacts are shown in the table. Table
Butt-type contact
Sliding finger contactwww.bzxz.net
Full string key
Rated current
1991-06-27
Contact width
Mounting hole (or screw hole M)
Shape and geometric dimensions
See Figure 1
See Figure 2
Figure 3
See Figure 4
1992-07-01 Small cable
Inspection rules
JB/T3270
4.1 The appearance quality, electroplating layer, geometric dimensions, surface roughness and chemical composition of the contact material, etc., of the contact shall be proposed by the design department of the manufacturer; if the user needs to conduct random inspection, it shall be indicated in the order contract. 4.2 During the trial production of contacts, they must be inspected one by one according to the items listed in Article 4.1 and the specific requirements put forward by the design department; among them, the electrical inlay, surface quality, and chemical composition of the contact material shall be sampled and inspected according to the special inspection level S-2 of the sample size code table specified in GB2828 and the normal inspection one-time sampling plan (AQL.=1.0), and each item of the inspected contacts shall be qualified. 4.3 For contacts that are regularly mass-produced, they shall be sampled and inspected once every three years according to the general inspection level I of the sample size code table specified in GB2828 and the normal inspection one-time sampling plan (AQL=1.0) according to the items listed in Article 4.1 and the specific requirements put forward by the design department. 4.4 Each batch of contacts shall be inspected one by one for their appearance quality, electroplating quality, and geometric dimensions. Figure 1
Other V
JB/T3270
Additional Notes:
JB/T3270
This standard is proposed by the Xiangtan Traction Electrical Equipment Research Institute of the Ministry of Machinery and Electronics Industry. This standard is under the jurisdiction of the Xiangtan Traction Electrical Equipment Research Institute. This standard is under the jurisdiction of the Xiangtan Traction Electrical Equipment Research Institute.
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