Loop resistance measuring pliers for trolley type switch

Abstract

The invention relates to a pair of loop resistance measuring pliers for a trolley type switch, which is good in use effect and safe and reliable. The loop resistance measuring pliers comprises a pliers body, the pliers body comprises two legs hinged with each other. A fastening and expanding bolt is in threaded connection with one of the legs of the pincers body. The free end of the fastening and expanding bolt leans against the inner surface of the other leg of the pincers body. The front end of each leg of the pincers body is fixedly connected with a pincers head. Each pincers head is provided with an assistant contact. A concave pit is excavated inside the other leg of the pincers body. The concave pit corresponds to the fastening and expanding bolt in position. The free end of the fastening and expanding bolt leans against in the concave pit. The cross section of the front end of the pincers head is semi-arc protruding outwards and providing with the concave pit. When the loop resistance measuring pliers is used to measure the loop resistance of the switch, the measuring pincers are placed inside the contact of the trolley type switch to adjust and measure the stretching amplitude of the two legs of the pincers by adjusting the expanding bolt, so that the pincers head of the measuring pincers leans against the inner side of the switch contact, and a switch resistance measuring meter is further connected to the assistant contact of the measuring pincers for measurement.

Description

technical field [0001] The invention relates to an electric device, in particular to a trolley-type switch circuit resistance measuring clamp. Background technique [0002] The existing measuring pliers used for the resistance test of the switch circuit are spring clip type, and the front end of the moving contact of the trolley switch has a circle of contact fingers fixed by the fixing piece and the spring, which is used for the contact of the moving and static contacts. Only when the trolley switch is pushed in Only when the switch cabinet is in the running position can the moving and static contacts be clamped to conduct the conductive circuit. When the switch is pulled out and the loop resistance is measured with spring-clip measuring pliers, the test error is caused by the contact fingers hindering the clamping of the conductive arm by the test pliers, which affects the judgment of the switch performance. The specific deficiencies are as follows: [0003] (1) The meas...

AI Technical Summary

Problems solved by technology

[0003] (1), the measurement accuracy is not high

Only the contacts of the trolley switch are exposed. When measuring the loop resistance, only the cylindrical contacts can be measured. The measuring clamps of the existing measuring instruments are not matched with the equipment. A test failure occurred

[0004] (2), easy to cause damage to the measured equipment

At present, the test current of the switch circuit resistance tester is about 100A. The test clamp of the existing tester is not matched with the switch, and the contact with the main circuit is not tight, which will easily cause the switch contact to discharge and burn out during the test.

Most of the test clips are jagged and in direct contact with the finger spring and the finger, which may easily cause damage to the spring and the finger

[0005] (3), the measurement is difficult, the measurement time is long, and the measurement efficiency is low

During the measurement, the clips used by the measuring equipment are difficult to clamp the contacts, even if they are clipped, they are easy to fall off, which brings trouble to the measurement, prolongs the test time and reduces the measurement efficiency

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