Swing arm type valve limit switch

Abstract

The invention provides a swing arm type valve limit switch which comprises: a supporting main body, a microswitch, a lever, a roller and a rotating shaft, wherein the lever is rotatably installed on the supporting main body, the head of the lever is used for triggering the microswitch, the roller is installed at the tail of the lever, a groove matched with the roller is formed in the rotating shaft, and in a normal state, the roller is partially clamped into the groove, when the rotating shaft rotates, the rotating shaft enables the roller to deviate and drives the lever to rotate, and the head of the lever triggers the microswitch; and a first elastic reset element which exerts elastic force on the lever, wherein in a normal state, the idler wheel is kept in the groove, the lever is driven to reset after the lever triggers the microswitch, and the second elastic reset element is arranged between the rotating shaft and the supporting body and used for resetting the rotating shaft. The combined structure of the rotating shaft, the roller and the lever is adopted for triggering, single-path signal transmission is used, the switch is directly triggered through the lever, and the response is rapid and reliable.

Description

technical field [0001] The invention belongs to the technical field of valves, in particular to a swing arm type valve limit switch. Background technique [0002] With the development of industry, the operating conditions of valves are constantly changing, and industries such as petroleum, petrochemical, metallurgy, and power stations have gradually increased their requirements for valve accessories and valve limit switches. The switch is exposed to high temperature for a long time, and mechanical wear occurs frequently. For working conditions such as power stations, the economic loss caused by shutdown and replacement of accessories is huge, so there are more stringent requirements for the service life of valve limit switches. [0003] Existing straight-stroke valve limit switches usually use a swing rod part to cooperate with two trigger rod parts with return springs. The actuator drives the swing arm to rotate, and the swing rod deflects to press the trigger rod on one s...

AI Technical Summary

Problems solved by technology

Using swing rod and trigger rod to trigger, on the one hand, there is a certain hysteresis when triggering, that is, the actuator has contacted the swing rod, but it still takes a certain amount of time to transfer to the micro switch, and it is necessary to adjust the installation position of the switch through cumbersome adjustments. To achieve the desired effect; on the other hand, because two separate trigger levers are used, there is a probability of failure in each trigger action, and it is very easy to cause one-sided failure to cause the failure of the entire valve limit switch, which greatly reduces the trigger structure. reliability

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