CN203103908U

CN203103908U - Under voltage protection circuit for electric concrete pump

Info

Publication number: CN203103908U
Application number: CN 201320051815
Authority: CN
Inventors: 韩秀明; 章刘贵; 龚峰
Original assignee: SHANGHAI HOLD HEAVY INDUSTRY Co Ltd
Current assignee: Liugong Construction Machinery Jiangsu Co ltd
Priority date: 2013-01-30
Filing date: 2013-01-30
Publication date: 2013-07-31
Anticipated expiration: 2023-01-30

Abstract

The utility model provides an under voltage protection circuit for an electric concrete pump. According to the utility model, a relay and a contactor controlling starting and operation of a motor are parallely arranged on a power supply circuit of the motor; after parallel connection of the relay and the contactor, the voltage value of the power supply circuit of the motor is monitored; when the voltage value of a main circuit changes and reaches a value to actuate the relay, the relay operates and transmits an actuating signal to a controller, and the controller cuts off power supply for the power supply circuit and a magnet ring winding circuit of the motor so as to realize under voltage protection of an electric line, wherein the controller is a PLC programmable controller.

Description

Electrodynamic type concrete pump under voltage protection circuit

Technical field

The utility model relates to a kind of under voltage protection circuit; particularly disclose a kind of electrodynamic type concrete pump under voltage protection circuit, prevented that the electrodynamic type concrete pump from crossing the damage of the low production equipment that causes or personnel's injures and deaths because of supply voltage in the course of the work.

Background technology

This link of conveying that has electric energy based on the electrodynamic type concrete pump in the course of the work, and the distance of power delivery distance will be decided according to the concrete condition of construction site, under power delivery distance situation far away, the loss of voltage is bigger, motor is moved under under voltage, and secondly the fluctuation of line voltage also can cause the instability of working line voltage.At this moment; motor speed descends on the one hand; the stator winding electric current increases; the amplitude that increases when electric current if do not take safeguard measure, is damaged along with time lengthening can make motor overheating when still deficiency makes fuse and circuit breaker action; on the other hand; under voltage will cause that some electrical equipment discharge, and make the circuit cisco unity malfunction, also cause the person, equipment breakdown easily.Therefore should take necessary under voltage protection measure, avoid motor under under voltage, to move.

Summary of the invention

The purpose of this utility model is in use to cause the loss of voltage owing to power delivery or the reasons such as spread of voltage that cause owing to power network fluctuation make motor move a kind of under voltage protection strategy that proposes under under voltage for fear of the electrodynamic type concrete pump; a kind of electrodynamic type concrete pump under voltage protection circuit is provided; effectively prevent because of the person, equipment breakdown that under voltage causes, improve the product safety performance.

The utility model is achieved in that a kind of electrodynamic type concrete pump under voltage protection circuit; go up the contactor of relay in parallel and control motor start-up and the operation of control motor at motor power circuit (being main circuit); back in parallel is monitored the magnitude of voltage of motor power circuit; when the main circuit magnitude of voltage changes and reaches when making the actuating of relay; the actuating of relay; and actuating signal passed to controller; controller cuts off motor power circuit and motor magnet ring winding circuit power supply by contactor, realizes the under voltage protection of electric wiring.Described controller is the PLC Programmable Logic Controller.

The utility model is by relay the voltage of main circuit to be monitored, and the actuating signal of relay is passed to controller, realizes the under voltage protection effect by controller.Relay coil with main circuit voltage is monitored after the contactor of control motor start-up and operation is in parallel, when main circuit voltage is lower than the rated voltage certain value and arrives certain hour, the actuating of relay avoids motor to move under under voltage thereby controller receives behind the signal of telecommunication of the actuating of relay power supply that cuts off main circuit and control circuit by contactor again.

The beneficial effects of the utility model are: under voltage protection circuit of the present utility model has prevented that effectively motor from moving the person, the equipment breakdown that is caused under under voltage; improved the security performance of system greatly; and control action is reliable, sensitive; realize easyly, also have preferable performance price ratio.

Description of drawings

Fig. 1 is the utility model electrodynamic type concrete pump under voltage protection circuit circuit diagram.

Embodiment

A kind of electrodynamic type concrete pump of the utility model under voltage protection circuit; go up the contactor of relay in parallel and control motor start-up and the operation of control motor at motor power circuit (being main circuit); back in parallel is monitored the magnitude of voltage of motor power circuit; when the main circuit magnitude of voltage changes and reaches when making the actuating of relay; the actuating of relay; and actuating signal passed to controller; controller cuts off motor power circuit and motor magnet ring winding circuit power supply by contactor, realizes the under voltage protection of electric wiring.

With reference to the accompanying drawings 1, relay K 1 plays the under voltage protection effect, and contactor KM1 controls motor start-up, the operation of contactor KM2 control motor.The coils from parallel connection of coils of relay K 1 is at measured main circuit two ends, the normally closed interlock of relay K 1 is connected to controller input point 2.2, by this normally closed interlock with the switching signal input controller, be connected to controller output point 2.0 behind the normally closed interlock of the solenoid series connection KM2 of contactor KM1, be connected to controller output point 2.1 behind the normally closed interlock of the solenoid series connection KM1 of contactor KM2.When contactor KM1 gets electricly, during the KM2 dead electricity, motor is with star-like connection, decompression starting, and when contactor KM1 dead electricity, KM2 gets when electric, and motor connects operation with triangle.Stable at voltage, when motor normally moves, the armature of relay K 1 is in attracting state, its normally closed interlock is opened, cause reason such as the loss of voltage to make the main circuit voltage fluctuation when power network fluctuation or because of power delivery or when descending, time is shorter, relay K 1 is failure to actuate, time is when arriving certain value, relay K 1 action, its armature discharges, and makes its normally closed interlock closure (the normally closed interlock K1 among Fig. 1), this switching signal input controller, controller makes contactor KM2 dead electricity, thereby cuts off main circuit power, motor stall.

Under voltage protection principle when the under voltage protection during the motor decompression starting moves with motor is identical.When voltage recovers just often, contactor because of the condition restriction of controlled device can be not voluntarily electric, so motor can not start voluntarily.

The utility model is in the electrodynamic type concrete pump course of work, realized the voltage of main circuit is carried out effective monitoring, avoid motor under under voltage, to move, and motor can cut off the power supply of main circuit and control circuit when moving rapidly under under voltage, make the motor stall.

The related hardware of the utility model comprises relay, contactor and controller module, and the sustaining voltage of selected relay should be higher than the sustaining voltage of contactor, and controller adopts the PLC Programmable Logic Controller.The relay that the utility model adopted, contactor and controller are the commercially available prod of extensive use on the market, so the utility model implements simple and conveniently, have high cost performance.

Claims

1. electrodynamic type concrete pump under voltage protection circuit; the contactor of relay in parallel and control motor start-up and the operation of control motor on motor power circuit; back in parallel is monitored the magnitude of voltage of motor power circuit; when the main circuit magnitude of voltage changes and reaches when making the actuating of relay; the actuating of relay; and actuating signal passed to controller, controller cuts off motor power circuit and motor magnet ring winding circuit power supply by contactor, realizes the under voltage protection of electric wiring.

2. according to the described electrodynamic type concrete pump of claim 1 under voltage protection circuit, it is characterized in that: described controller is the PLC Programmable Logic Controller.