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Remote switch type actuator and control method

An actuator and remote switch technology, applied in electrical program control, program control in sequence/logic controllers, etc., can solve problems such as equipment accidents and valve stem damage, and achieve easy maintenance, prevention of enlargement, and accurate calculation. Effect

Active Publication Date: 2020-07-21
SHANGHAI MEISHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in an abnormal state, if the torque controller 1 and the valve position limiter 2 fail, if the operator sends out the DCS remote control 3 command, after the valve motor is energized, the valve will continue to open and close, and no corresponding measures can be taken Stop the valve motor until the valve stem of the actuator is damaged, causing serious accidents to the equipment

Method used

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  • Remote switch type actuator and control method
  • Remote switch type actuator and control method
  • Remote switch type actuator and control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1: see figure 1 — Figure 4 , a remote switch type actuator, the actuator includes a torque controller 1, a valve position limiter 2, a DCS remote controller 3, a current detector 4, a DCS pulse and counting function block 5, and a valve motor overcurrent repair function Block 6, the torque controller 1 is composed of two contacts GKA, a relay GKA, a micro switch STC and a micro switch STO, and the valve position limiter 2 is composed of a valve limiter FKA, a valve close position RKA, a relay FKA, The relay RKA, the switch FSW and the switch RSW are composed, wherein the switch RSW controls the relay RKA, and the switch FSW controls the relay FKA. The DCS remote controller 3 is composed of the opening contact DOO and the closing contact DOC in the DCS system. The current detector 4 is Composed of current transformers and current transmitters, the DCS pulse and counting function block 5 is composed of a pulse module TP, an open counter module C1, an off coun...

Embodiment 2

[0016] Example 2: see figure 1 — Figure 4, a remote switch type actuator control method, the method is a time pulse control method, no matter whether the torque controller 1 and the valve position limiter 2 of the valve are working normally, through the pulse module TP in the DCS pulse and counting function block 5 , It can flexibly control the switch type actuator to achieve the expected position. Such as figure 2 As shown, when the operator needs to control the remote valve, the operator performs switch operation on the HMI of the DCS, and the DCS system sends a closing signal with a long TP time. figure 1 In the DCS remote control 3 action, the valve motor will move in the direction of the command until the valve position controller 2 acts, the valve motor stops working, and the valve reaches the designated switch position; the time pulse determination method is as follows: image 3 As shown, TP=T+Δt, T is the time required for the full stroke of the actuator switch. S...

Embodiment 3

[0017] Embodiment 3: see figure 1 — Figure 4 , a remote switch type actuator control method, the method is a motor overcurrent repair method, in order to ensure the safe operation of the valve, intelligent control of the valve motor in the process of overcurrent, a current overcurrent repair method is proposed. Under normal working conditions of the valve motor, through figure 1 The current detection 4 in the circuit sends the actual current to the DCS system, and the DCS system monitors the change of the current. Once the current changes abnormally, it can be judged that the motor is stuck and the movement is not smooth. It is necessary to repair and focus on the monitoring of the valve motor. Thereby ensuring the safety of the equipment. According to the characteristics of the motor, the starting current is not fixed, but changes with time, and needs to pass Figure 4 The 0.5-second pulse in the motor is used to eliminate the influence of the starting current, and the lo...

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Abstract

The invention relates to a remote switching type execution mechanism. The remote switching type execution mechanism comprises a torque controller, a valve position limiter, a DCS remote controller, a current detector, a DCS pulse and counting functional block, a valve motor overcurrent repairing functional block, wherein the torque controller is composed of two contacts GKA, a relay GKA, micro switch STC and a micro switch STO; the valve position limiter is composed of a valve opening in-place FKA, valve closing in-place RKA, a relay FKA, a relay RKA, a switch FSW and a switch RSW; the DCS remote controller 3 is composed of an open contact DOO and a close contact DOC in a DCS system; the current detector is composed of a current transformer and a current transducer; the DCS pulse and counting functional block 5 is composed of a pulse module TP, an opening counter module C1, a closing counter module C2, an addition module ADD and a calculator module C; and the valve motor overcurrent repairing functional block 6 is composed of a comparator, an AND gate, an OR gate, an exclusive-OR gate, a bistable state circuit and a time relay.

Description

technical field [0001] The invention relates to a remote switch actuator, in particular to a remote switch actuator and a control method, belonging to the technical field of automatic control. Background technique [0002] The switch-type actuator is a mechanism used for remote control of valves. It can open or close a certain valve according to the needs of users, and realize the automatic control of modern industry. After the operator sends out an action command from the DCS, after the electrical circuit of the actuator receives the action command, the command contact is closed, the electrical circuit is turned on, the contactor acts, and the motor rotates. When the valve position reaches the set position of the valve controller, the valve in the circuit The normally closed contact of the valve position is disconnected, the motor circuit is disconnected, the contactor is disconnected, the motor stops, and the normally open contact of the valve position is closed at the sam...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B19/04
CPCG05B19/04
Inventor 王栋陆振岳陆洪波顾蓉成涛
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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