Meter clamping apparatus with self-locking device

Abstract

A meter clamping apparatus with a self-locking device comprises a control structure and a meter clamping apparatus main body. The control structure comprises a three-way four-position valve, a main water inlet valve, a close delayed switch and an open delayed switch, wherein work port A and B ports of the three-way four-position valve and an end port of an atmosphere end are respectively connected with a first switch, a second switch and a third switch; the other end of the first switch is connected with a main air inlet pipe; the main air inlet pipe is further connected with a fourth switch; an air inlet, the first switch and the fourth switch are in a parallel connection way; the fourth switch is connected with a main water inlet stop valve; a relay connected with a power supply controls the first switch, the second switch and the third switch; the open delayed switch and the close delayed switch are connected with the power supply; the open delayed switch is connected with the fourth switch; and the close delayed switch is connected with a main switch. Safety performance of the meter clamping apparatus can be improved during the operation; and potential safety danger due to wrong manual operation can be prevented.

Description

technical field [0001] The invention relates to the field of factory inspection of water meters, in particular to a meter holder of a water meter inspection device. technical background [0002] At present, the meter holders of the water meter calibration station on the market do not have the self-locking function, and basically use the three-position four-way hand valve to directly control the actuator. In the actual use process, there will be the following problems: [0003] 1. During the normal operation of the detection device, the operator unconsciously touches the switch stem of the three-position four-way valve, and high-pressure water in the pipeline will spray out, causing damage to the operator or equipment, and a large amount of water in the workplace will affect normal operations. In production work, if the measured medium in the pipeline is high-temperature water, the personal injury will be greater. [0004] 2. Due to the lack of experience of the operator, or...

AI Technical Summary

Problems solved by technology

[0003] 1. During the normal operation of the detection device, the operator unconsciously touches the switch stem of the three-position four-way valve, and high-pressure water in the pipeline will spray out, causing damage to the operator or equipment, and a large amount of water in the workplace will affect normal operations. In production work, if the measured medium in the pipeline is high-temperature water, the damage to the body will be greater

[0004] 2. Due to the lack of experience of the operator, or forgetting to open the watch clamp, starting to operate the equipment will also cause the problem of water spraying of the device, so directly using the hand-turned three-position four-way valve to control the actuator has a great potential safety hazard. Higher requirements for personnel

However, the long-term friction between the outer casing 2 and the piston 3 will cause the wear of the sealing ring 1. When the air pressure is 0.6Mpa, the gas will be squeezed to the liquid pipeline 4 through the sealing ring, causing a safety hazard

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