External valve position detection device

Abstract

The invention discloses an external valve position detection device which comprises a proximity switch, an ejector rod, a trigger piece and a supporting base. The supporting base is fixed in a valve shell in an embedded mode, the ejector rod penetrates in the right side wall of the supporting base in a horizontal sliding sealing mode, the right end of the ejector rod is arranged in the valve shellin a sliding mode and detachably abuts against a movement component in the valve shell, the upper side wall of the supporting base is provided with a long-strip-shaped second guide hole, the outer side wall of the valve shell is provided with a long-strip-shaped shell through hole, the trigger piece penetrates in the second guide hole and the shell through hole in a horizontal moving mode, the proximity switch is detachably fixed to the outer wall of the valve shell and located on the left side of the shell through hole, the lower end of the trigger piece is connected with the left end of theejector rod, and the upper end of the trigger piece is opposite to the proximity switch. According to the external valve position detection device, the structure is compact, maintenance is convenient, the maintenance cost is low, maintenance and adjusting operability is higher, and control signals reflecting valve position states can be accurately transmitted in time.

Description

technical field [0001] The invention relates to a valve position detection device, in particular to an external valve position detection device. Background technique [0002] With the continuous improvement of automation and intelligence, valves or other equipment are required to have remote automatic control and status feedback functions. Among them, the on-off valve is relatively simple, and there are only two positions, open and closed. In order to detect the status of the valve position, Usually, a valve position detection device is installed on the valve, and the common ones are travel switch, proximity switch, photoelectric switch, etc. The former is contact type, and the latter two are non-contact type, so the latter has a longer service life, especially the proximity switch. The switch structure is simple and compact, easy to install, and widely used in the valve industry. [0003] The working principle of the proximity switch is mainly: when the metal detector appr...

AI Technical Summary

Problems solved by technology

[0005] (1) The cable protruding from the valve housing 5 of the proximity switch 1 is easily cut off due to bumps during installation, transfer and maintenance, making it impossible to continue to use, or the valve must be disconnected once it fails and cannot work normally. It is removed from the production line, and then replaced after dismantling, and the sealant 13 applied for sealing is also very troublesome to clean up;

[0006] (2) The installation and debugging of the built-in proximity switch 1 is relatively complicated. Once the detection distance is not set enough to cause signal instability, it needs to be replaced or adjusted again, and there is also the problem of disassembly and assembly

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