CN102088180B

CN102088180B - Novel fire cutoff phase-stagger protector for electric hoist

Info

Publication number: CN102088180B
Application number: CN2009102529678A
Authority: CN
Inventors: 赵新卫
Original assignee: Xuchang Power Supply Co of Henan Electric Power Co
Current assignee: Xuchang Power Supply Co of Henan Electric Power Co
Priority date: 2009-12-07
Filing date: 2009-12-07
Publication date: 2013-12-04
Anticipated expiration: 2029-12-07
Also published as: CN102088180A

Abstract

The invention discloses a novel fire cutoff phase-stagger protector for an electric hoist, comprising a first limiting stopper and a second limiting stopper, wherein the first limiting stopper is connected between an electromotor and two parallel alternating current contactors in an electromotor control circuit; the pulling normally closed contact and the pushing normally closed contact of the first limiting stopper are respectively used for connecting two contacts of the main contacts of a first alternating current contactor and two contacts of the main contacts of a second alternating current contactor; the pulling normally closed contact of the second limiting stopper is connected with the pushing normally closed contact of the first limiting stopper; and the pushing normally closed contact of the second limiting stopper is connected with the pulling normally closed contact of the first limiting stopper. Cutoff limiting protection and power supply phase-stagger protection can be effectively realized for the electric hoist by the novel fire cutoff phase-stagger protector in the invention, the reliability is high, the novel fire cutoff phase-stagger protector also can provide effective and reliable protection even if the alternating current contactors are adhered or a main circuit is subjected to phase stagger in the overhauling process, and the accidents can be avoided.

Description

Novel cutoff misphase protector of electric hoist

Technical field

The present invention relates to electric block, relate in particular to a kind of Novel cutoff misphase protector of electric hoist.

Background technology

At present, the steel-wire rope type electric block of China has experienced imitation, development, improve three phases, CD, MD type electric block is China's current production rate maximum, the most widely used electric block, according to JB9009-1999 steel-wire rope type electric block safety regulations, require electric block should there is the fault-phase protection function, and in prior art, electric block only has upper and lower bidirectionally limited function, error-free phase sequence function, there is no the cutoff limit function yet, when the power phase wrong, motor can not stop on time, easily cause the accident, therefore need a kind of phase sequence relay with cutoff type of cutoff and fault-phase protection effect of design.

Summary of the invention

The purpose of this invention is to provide a kind of electric block cutoff open phase protector with cutoff and fault-phase protection, the generation of minimizing accident.

The present invention adopts technique scheme: a kind of Novel cutoff misphase protector of electric hoist, comprise the first stop and the second stop, described the first stop be used for being connected in electromotor control circuit the first A.C. contactor in parallel and the second A.C. contactor and and motor between, wherein the first stop pushes normally closed interlock open and pulls open normally closed interlock and be used for respectively being connected wherein two contacts of the first AC contactor main contact and wherein two contacts of the second AC contactor main contact, the normally closed interlock that pulls open of the second stop is connected with the normally closed interlock of pushing open of the first stop, the normally closed interlock of pushing open of the second stop is connected with the normally closed interlock that pulls open of the first stop.

The present invention is connected with two circuit fire stops in electromotor control circuit; can play the defencive function to motor when the power supply misphase; and when motor runs to extreme position, can also play the effect of cutoff protection, can effectively prevent from the cucurbit phenomenon of " rushing to summit " occurring because of misphase.Reliability of the present invention is higher, make simple, even A.C. contactor occur adhesion or because of the major loop misphase appears in maintenance process all can be effective, be protected reliably, can avoid the generation of accident.

The accompanying drawing explanation

Fig. 1 is catenation principle figure of the present invention;

The scheme of installation that Fig. 2 is stop in the present invention.

Embodiment

With reference to the accompanying drawings the present invention is further described in detail.

The present invention includes the first circuit fire stop XWK 1 and the second circuit fire stop XWK 2, as shown in Figure 1, with CD, MD type electric block control circuit is example, the first circuit fire stop XWK1 and the second circuit fire stop XWK2 are connected between the first A.C. contactor and the second A.C. contactor and motor M, wherein the first circuit fire stop XWK's 1 pushes normally closed interlock TK1 open and pulls open normally closed interlock LK1 and be used for respectively being connected wherein two contacts of the first AC contactor main contact CJ1 and wherein two contacts of the second AC contactor main contact CJ2, the end that pulls open normally closed interlock LK2 of the second circuit fire stop XWK2 is connected with the normally closed interlock TK1 that pushes open of the first circuit fire stop, the end of pushing normally closed interlock TK2 open of the second circuit fire stop XWK2 is connected with the normally closed interlock LK1 that pulls open of the first circuit fire stop.

As shown in Figure 1, when power phase is correct, after pressing K switch A2, K switch A3, the coil CJ-1 of A.C. contactor obtains electric, the main contact CJ closure of A.C. contactor; The coil CJ1-1 of the first A.C. contactor obtains electric, the main contact CJ1 closure of the second A.C. contactor, because the normally closed interlock LK2 that pulls open that pushes normally closed interlock TK1 and the second circuit fire stop XWK2 open of the first circuit fire stop XWK1 is closed, motor M does ascending motion, during to extreme position, the first circuit fire stop XWK1 is because being subject to the thrust of pull bar, the first circuit fire stop XWK1 action, normally closed interlock TK1 is pushed in cut-out open, thereby cut off motor M power supply, motor M stops incompetent running and reaches the cutoff limit function.

As shown in Figure 1, when the power phase misconnection, press K switch A2, after K switch A4, the coil CJ-1 of A.C. contactor obtains electric, the main contact CJ closure of A.C. contactor, the coil CJ2-1 of the second A.C. contactor obtains electric, the main contact CJ2 closure of the second A.C. contactor, because the normally closed interlock TK2 that pushes open that pulls open normally closed interlock LK1 and the second circuit fire stop XWK2 of the first circuit fire stop XWK1 is closed, motor M does ascending motion, during to extreme position, although the first circuit fire stop XWK1 moves and cuts off and push normally closed interlock TK1 open, but pulling open normally closed interlock LK1 does not move, power supply does not cut off, motor M continues to do ascending motion, after motion one segment distance, the second circuit fire stop XWK2 is because be subject to the thrust of pull bar, the second circuit fire stop XWK2 action, normally closed interlock TK2 is pushed in cut-out open, power supply is cut off motor M and finally shuts down, thereby fault-phase protection while having reached rising.As a same reason, when motor M does descending motion, circuit fire stop is the pulling force that is subject to pull bar, makes corresponding actions motor M is effectively protected.

The present invention, when installing and using, in commercially available circuit fire stop, pushes normally closed interlock open and pulls open normally closed interlock linking together, and must untie in use; Install as shown in Figure 2, size (L '-L)/2 must be less than circuit fire stop XWK1 and touch bridge spring-compressed distance, otherwise can cause circuit fire stop to damage, and do not reach the fault-phase protection function.

The adjustment of circuit fire stop is that the stop piece 3,4 by adjusting on gag lever post 5 is realized.The method of adjusting is: unclamp the screw on stop piece 3,4, and stop piece 3, the 4 rope guide clamp both sides that are placed in, clamp can move by promotion stop piece freely.When actuating motor starts to hoist; clamp promotes upper limit stop piece 5 and moves; rise on the lifting hook pulley shell along under the reel shell during along 150mm～50mm; stop rising; crawl decline button, when rope guide moves back the 10mm left and right, shut down; mobile upper limit stop piece 5, near clamp, screws screw and gets final product.The adjustment of lower position is the same, is opposite direction, but must guarantee that suspension hook, when extreme lower position, leaves the above steel wire rope of three circles on reel.

Claims

1. a Novel cutoff misphase protector of electric hoist, it is characterized in that: comprise the first stop and the second stop, described the first stop is used for being connected between the first A.C. contactor and the second A.C. contactor and motor in parallel in electromotor control circuit, wherein the first stop pushes normally closed interlock open and pulls open normally closed interlock and be used for respectively being connected wherein two contacts of the first AC contactor main contact and wherein two contacts of the second AC contactor main contact, the normally closed interlock that pulls open of the second stop is connected with the normally closed interlock of pushing open of the first stop, the normally closed interlock of pushing open of the second stop is connected with the normally closed interlock that pulls open of the first stop.