Electric oil cylinder valve positioning and control device

Abstract

The invention discloses an electric oil cylinder valve positioning and control device which comprises an opening position limiting touch block, a closing position limiting touch block, an opening position limiting switch, a closing position limiting switch, an opening position stepping trigger switch, a closing position stepping trigger switch and a control circuit. The control circuit comprises a plurality of contacts, a plurality of middle relays and a plurality of time relays. The opening position stepping trigger switch is arranged on one side of the opening position limiting touch block and the opening position limiting switch. The closing position stepping trigger switch is arranged on one side of the closing position limiting touch block and the closing position limiting switch. All the trigger switches are located at the distance positions where the kinetic energy is reduced to zero when a valve element reaches the target position under the resistance of materials of the maximum weight in a hopper. When the weight of the materials in the hopper changes on the basis of the minimum weight and the intrinsic kinetic energy is not large enough to allow the valve element to reach the target position, the valve element enters an automatic stepping running mode to reach the target position. Accurate positioning can be achieved, and impact is avoided.

Description

technical field [0001] The invention relates to a valve positioning control device, in particular to an electric oil cylinder valve positioning control device. Background technique [0002] At present, the positioning of the electric cylinder valve is realized by the limit position. The original limit switch and touch block arrangement are as follows: figure 1 As shown, the feed through the hopper 3 is controlled by the valve 4. The valve 4 includes a valve body 4a and a valve core 4b matched with the valve body. The stop block 7 and the push rod are connected to the piston 2a of the oil cylinder 2, and the oil cylinder 2 is driven by the motor 1; when the spool 4b of the valve 4 moves in the valve body 4a driven by the piston 2a, it moves from the closed position to the open position and the open position When the limit bumper 6 touches the open position limit switch 8, the valve 4 stops at the open position; when the valve 4 moves from the open position to the closed posi...

AI Technical Summary

Problems solved by technology

Due to the inertia of the motor 1, its rotational kinetic energy cannot be reduced to zero instantly at the positioning point, and the kinetic energy will produce an impact between the valve core 4b and the valve body 4a of the valve 4, making the valve 4 extremely vulnerable to damage, so the service life cannot be guaranteed

If the AC speed control device is used for control, precise positioning control can be achieved, but the cost is expensive and the operating cost is high

[0003] In practice, in order to consume the kinetic energy generated to avoid damage to the valve, the limit switch is moved to the middle for a certain distance, so that the kinetic energy can be consumed at this distance, but due to the uncertainty of the amount of feed in the silo, the valve is affected The force is uncertain, so the distance moved has no definite value

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