CN104265990A - Position feedback device of shock-resisting automatic valve - Google Patents

Abstract

Disclosed is a position feedback device of a shock-resisting automatic valve. The position feedback device of the shock-resisting automatic valve is mounted at the top end of a valve body or an operating mechanism and comprises proximity switches, a fixing support and coaxial baffles. The coaxial baffles are welded to the portion of the valve core shaft of the automatic valve or the shaft of the operating mechanism, which extends out of the valve core and accordingly can rotate along with a valve core; the fixing support is welded on one side of the valve body; the two proximity switches are mounted on the fixing support in parallel and accordingly can be on the same plane with the coaxial baffles. Due to the fact that the feedback switches are in a non-contact state, the position feedback device of the shock-resisting automatic valve solves the problem of malfunction due to shock; according to the different requirements of a control system, the witches can be provided with appropriate voltage levels in appropriate wiring manners, so that the reliability of the system can be greatly enhanced.

Description

An anti-vibration automatic valve position feedback device

technical field

The invention relates to an anti-vibration automatic valve position feedback device.

Background technique

Automatic valves are widely used in industrial production. Electric valves and hydraulic valves play an important role in transmission medium transmission and cooling water supply in large systems. Therefore, the position signals of fully open and fully closed automatic valves are important signals in the control link. Their feedback Whether the signal is correct or not directly affects the correct operation of the entire system automation control process. In the traditional technology, take the automatic butterfly valve as an example: the rotating shaft of the valve core is connected to the central shaft of the operating mechanism (electric or hydraulic transmission), and two cams are placed on the central shaft of the operating mechanism. The two cams are arranged up and down, and are concentric with the valve shaft. When the valve body is in the fully closed position, contact micro switches are arranged up and down at the tangent line of the cam flange, and the micro switches are squeezed by the spool rotating cam to send a position feedback signal. The main disadvantage of the traditional technology is that the cam and the micro switch need to be in close contact to send out a stable signal. However, in an environment with large vibrations, the cam cannot be tightly pressed against the micro switch, and the switch may even be damaged due to excessive vibration. , causing the signal to fail to be sent to the control system or an unstable situation occurs, causing the automatic control process to exit due to unsatisfied conditions, which greatly affects the reliability of the system.

Contents of the invention

The purpose of the present invention is to provide an anti-vibration automatic valve position feedback device. The feedback switch of the device adopts non-contact type, which solves the device failure caused by the vibration problem.

In order to realize the purpose of the present invention, the technical scheme adopted in the present invention is:

An anti-vibration automatic valve position feedback device, installed on the top of the valve body or the operating mechanism, including: a proximity switch, a fixed bracket and a coaxial baffle, the coaxial baffle and the spool shaft of the automatic valve or the operating mechanism The part where the shaft extends out of the valve body is welded together so that it can rotate with the valve core; the fixed bracket is welded on one side of the valve body, and the number of proximity switches is two. The two proximity switches are installed in parallel on the fixed bracket so that the proximity switch In the same plane as the coaxial baffle.

The proximity switch is powered by 24V DC, and the diameter of the switch is M10-M18 of the external thread type.

The coaxial baffle has a bottom surface and two elevation surfaces, the three surfaces are vertical, the bottom surface is opened, and the long bolts pass through the bottom surface, and the two sides are fastened with bolts; the long bolts extend from the valve core shaft or the operating mechanism shaft The part of the valve body is welded so that it can rotate with the valve core; the two facades correspond to the two proximity switches respectively.

The advantages and effects of the present invention are:

In the present invention, the shaft of the valve core or the shaft of the operating mechanism is used to extend out of the valve body, and the coaxial shield is installed on the existing rotating structure so that it can rotate with the valve core, and the fixing bracket is welded on one side of the valve body, two The proximity switch is installed in parallel on the fixed bracket, so that the switch and the rotating flap are on the same plane. When the flap rotates to the fully open or fully closed position with the valve core, it is just in the sensing area of the proximity switch, thereby sending out a signal. Since the feedback switch adopts non-contact type, it solves the device failure caused by the vibration problem, and the switch can choose the appropriate voltage level and wiring method according to the different needs of the control system. Greatly improved the reliability of the system.

Description of drawings

Fig. 1 is the front view of the present invention;

Fig. 2 is a side view of the present invention;

Fig. 3 is a top view of the present invention.

In the figure: proximity switch 1, fixed bracket 2, coaxial baffle 3, top of valve body or operating mechanism 4, coaxial bolt 5.

Detailed ways

As shown in Figures 1-3, an anti-vibration automatic valve position feedback device of the present invention is installed on the valve body or the top 4 of the operating mechanism, and includes: a proximity switch 1, a fixed bracket 2 and a coaxial baffle 3, the The coaxial spacer of the automatic valve and the spool shaft of the automatic valve or the part of the operating mechanism shaft extending out of the valve body are welded together through the coaxial bolt 5, so that it can rotate with the valve core; the fixed bracket is welded on one side of the valve body, close to the switch The number is two, and the two proximity switches are installed in parallel on the fixed bracket, so that the proximity switches and the coaxial block are in the same plane.

The said proximity switch is powered by 24V DC, and the diameter of the switch is M10-M18 of the external thread type. It can sense metal objects within 5-8mm in front of the sensor, and the switch wiring can choose "two-wire, three-wire, four-wire" mode.

The fixed bracket is made of steel plate, and the proximity switch is fixed on the fixed bracket with bolts, and the distance between the two proximity switches can be adjusted. A spring washer is installed between the fixed bracket and the bolt to prevent vibration from causing the bolt to loosen.

The coaxial baffle is processed by steel plate, has a bottom surface and two elevations, three vertical surfaces, holes are opened on the bottom surface, long bolts pass through the bottom surface, and the two sides are fastened with bolts; the long bolts are connected with the valve core shaft or the operating mechanism The shaft extends out of the valve body and is welded so that it can rotate with the valve core; the two elevation positions correspond to the corresponding positions of the proximity switch.

Claims (3)

1. an against shock automatic valve position feedback device, be arranged on valve body or operating device top, it is characterized in that including: proximity switch, fixed support and coaxial catch, the part that described coaxial washer and the poppet shaft of automatic valve or operating device axle extend valve body welds together, and makes it can with valve core rotation; Fixed support is welded on valve body side, and the quantity of proximity switch is two, and two proximity switches are installed in parallel on fixed support, makes proximity switch be in same plane with coaxial catch.

2. a kind of against shock automatic valve position feedback device according to claim 1, is characterized in that described proximity switch is 24V direct current supply, and switch diameter is outside screw type diameter M10-M18.

3. a kind of against shock automatic valve position feedback device according to claim 1, is characterized in that described coaxial catch has a bottom surface and two facades, and three faces are vertical, bottom surface perforate, with stay bolt through bottom surface, and both sides bolton; Stay bolt extends valve body part with poppet shaft or operating device axle and welds, and makes it can with valve core rotation; Two facades are corresponding respectively with two proximity switches.