CN2052934U

CN2052934U - Multi-function controller for ac electromagnet brake

Info

Publication number: CN2052934U
Application number: CN 88220738
Authority: CN
Inventors: 董惠鹏; 董亚鹏
Original assignee: Individual
Current assignee: Individual
Priority date: 1988-12-02
Filing date: 1988-12-02
Publication date: 1990-02-14

Abstract

The utility model belongs to the improvement of electromagnets, in particular braking electromagnets. An electronic controller comprising a starting circuit, a maintaining circuit, a switching circuit and a time-delay releasing circuit control the operation of the electromagnet, and the time-delay releasing circuit which is provided with an independent power supply can adopt a rechargeable battery. The controller which has reliable use, low cost, obvious effect of power saving is particularly suitable for the secondary braking control of the electromagnets of large-sized cranes and relay-type and band-type conveying systems.

Description

Multi-function controller for ac electromagnet brake

The utility model belongs to electromagnet, particularly to the improvement of AC brake electromagnet.Lower, simple in structure, the reliable in action, easy to adjust of AC brake electromagnet price is widely used in the brake apparatus of various travelling mechanisms.The general mechanism of braking be adopt electrical network directly power, switch on declutch, power-off brake.The problem that it brings is

(1), operation is frequent or energising adhesive phase when long, the electromagnet energy consumption is big, and coil easily burns.

(2), the sudden power of electrical network, travelling mechanism is braked suddenly, damage parts easily even cause the accident.

A kind of full voltage starting appears in recent years, the electromagnet power supply plan that low-voltage is kept, and it is exactly wherein an example that the electromagnet high-efficient energy-saving controller is provided among the CN86206031U.This class scheme is effectively for solving aforesaid first kind of difficulty, but can not solve aforesaid second kind of difficulty.For the goliath or the relay-type belt conveyor systems that adopt the secondary braking scheme, the potential hazard of electrical network sudden power is even more serious.

The purpose of this utility model provides a kind of electronic controller, and this controller is worked electromagnet under the power supply state of secondary controllable electric power, guarantees that the brake operating of travelling mechanism is safer reliable, and obvious power savings is arranged.

Basic design of the present utility model is to provide an electronic controller to braking electromagnet, comprise the high voltage direct current start-up circuit, low-voltage direct holding circuit and one start-keep power supply switch circuit, comprise that also a time-delay discharges control circuit, this circuit can make the secondary braking electromagnet obtain the time-delay braking.

This time-delay release control circuit is obtained working power from the rectifier DZ of electronic controller, relay J 2 is serially connected in the collector loop of time-delay amplifying triode BG1-BG2, and its normally opened contact J2-1 is serially connected in DC power supply DC and the electromagnet coil loop, be provided with capacitor C 4 and potentiometer W in the base stage of transistor BG1-BG2 and the emitter circuit, be used to control delay time.Electromagnet coil itself directly is connected in the rectifier DZ output loop of controller.Like this, when electromagnet is in when keeping operating state, power by rectifier DZ; Rectifier DZ quits work during braking, by DC power supply DC power supply, and when the delay time of capacitor C 4 and potentiometer W control reached the stipulated time, transistor BG1-BG2 ended, the normally opened contact J2-1 that relay J 2 discharges it opens the tripping magnet coil power supply.Adopt sort circuit, make the braking of under the grid cut-off situation, still normally delaying time of secondary braking electromagnet, kept the function of electromagnet full voltage starting, low voltage sustain simultaneously.

This time-delay discharges control circuit and also comprises a charging and voltage stabilizing circuit, with using under the rechargeable battery situation, utilizes aforesaid low voltage sustain DC power supply to charge the battery.

Further specify embodiment of the present utility model below in conjunction with accompanying drawing.

Accompanying drawing is the multifunctional controller circuit theory diagrams that are used for gantry crane wind prevention braking electromagnet.The coil series connection of four wind prevention braking electromagnet DT1-DT4 is in circuit.Switch AK, electromagnet DT1-DT4, R7, D3, the normally-closed contact J1-1 of relay J 1 and continued flow tube D5 form the high voltage direct current loop.Relay J 1, solid-state time-delay relay JC constitutes the high and low pressure commutation circuit.Transformer B, bridge rectifier D Z, D4, C3 and DT1-DT4 constitute the low-voltage direct loop.D1, D2, R2, R3, R6, C4, C6, potentiometer W, relay J 2 time-delay amplifying triode BG1, BG2, voltage stabilizing didoe DW, charging option switch ZK1-1, ZK1-2 and battery DC constitute delay releasing circuit.This delay releasing circuit is started working when high pressure switches to low pressure, and promptly DZ charges to C4 by D1, R2, amplifies compound transistor BG1, BG2 saturation conduction through time-delay behind the certain hour, makes the J2 adhesive, and delay releasing circuit enters the preparatory stage.DT1-DT4 kept adhesive by battery DC by normally-closed contact J1-2 and normally opened contact J2-1, D4 when time-delay discharged.The C4 discharge, multiple tube BG1, BG2 collector loop electric current descend, and discharge until relay J 2.Adjust potentiometer W and can change delayed release time.When ZK1-2 and ZK1-2 were closed, DZ charged to rechargeable battery DC by ZK1_1, R6 and ZK1_2, and voltage-stabiliser tube DW controls charging voltage.

Present embodiment also comprises the power indicating circuit of FD1, R1, C1 formation and the delay indicating circuit that FD2, R4 constitute; fuse RD1, RD2, RD3 piezo-resistance VR1, VR2, VR3 and C5, R5, C7, R8 protective circuit operate as normal, switch ZD is used for brake hard.

Present embodiment is remarkably productive in actual use, and its major advantage is:

(1), under the situation of electrical network sudden power, wind prevention braking electromagnet time-delay release function is normal, never occurs unexpected.

(2) even controlled electromagnet coil never burnt when condition of work worsens.

(3), it is energy-conservation that obviously on-the-spot test shows under the 380V line voltage, the operating current of multifunctional controller that control is provided for four MZD-300 anti-wind brakes is less than 1A, power factor (PF) is 0.88, braking moment also has and improves.And former electromagnet is 0.46 at the operating current that exchanges under the 380V voltage for the 8A power factor.

(4), the controller cost of manufacture is low, the cost of every cover controller is no more than 300 yuan.

The utility model both can have been realized the technological transformation of existing brakes easily, can be applied to again to have good Technological Economy development prospect in the various new brakes.

Claims

1, a kind of braking electromagnet electronic controller, comprise the high voltage direct current start-up circuit, low-voltage direct holding circuit and startup--keep commutation circuit, it is characterized in that described electronic controller comprises that also a time-delay discharges control circuit, this circuit is by rectifier DZ, the transistor delay amplification circuit, relay J 2 and DC power supply DC form, relay J 2 is serially connected in the transistor collector and rectifier DZ loop of transistor delay amplification circuit, the normally opened contact of relay J 2 is serially connected in DC power supply DC in the electromagnet coil loop, is connected in transistor base and the emitter circuit after potentiometer W and capacitor C 4 parallel connections.

2, controller according to claim 1 is characterized in that described delay releasing circuit also comprises the charging and voltage stabilizing circuit that a R6, switch Zk1-1, Zk1-2 and voltage-stabiliser tube DW form.