CN204902594U

CN204902594U - A spacing alarm device of two travel switch for furnace gate

Info

Publication number: CN204902594U
Application number: CN201520589455.1U
Authority: CN
Inventors: 刘玲玲; 张晓冬; 上官建林; 唐力
Original assignee: Zhengzhou Institute of Finance and Economics
Current assignee: Zhengzhou Institute of Finance and Economics
Priority date: 2015-08-03
Filing date: 2015-08-03
Publication date: 2015-12-23
Anticipated expiration: 2025-08-03

Abstract

The utility model discloses a spacing alarm device of two travel switch for furnace gate, limit switch on fixing on furnace gate door frame upper portion both sides first limit switch and second, the first limit switch's of going up normally open contact and first control relay coil constitute first series branch, and limit switch's normally open contact and second control relay coil constitutes the second series branch on the second, first, two control relay normally closed contact j11, j21 establish ties in furnace gate elevator motor M's promotion control circuit, the third series branch is formed to first control relay normally closed contact j12, second control normally open contact j22 and an alarm relay coil, the fourth series branch is formed to first control normally open contact j13, second control relay normally closed contact j23 and the 2nd alarm relay coil. The utility model discloses the advantage lies in guaranteeing the security that car -type annealing stove furnace gate was opened and close, has avoided the furnace gate to surpass the problem of stroke.

Description

For the two-pass switch limit alarm device of fire door

Technical field

The utility model relates to trolley type annealing furnace, especially relates to the two-pass switch limit alarm device for fire door.

Background technology

At heat treatment industry, trolley type annealing furnace is typically equipped with fire door, the lifting of fire door realizes automatically stopping by travel switch, existing fire door upper limit only adopts a travel switch as limit switch, when when travel switch abnormal damage, workman does not have a Timeliness coverage, fire door may exceed stroke when rising, and continues to rise will cause fire door to hit fire door crossbeam causing crossbeam to occur being out of shape after exceeding stroke, and serious conditions lower furnace door steel wire rope or connector rupture the major accident causing fire door to fall down.

Summary of the invention

The utility model object is to provide a kind of two-pass switch limit alarm device for fire door.

For achieving the above object, the utility model takes following technical proposals:

Two-pass switch limit alarm device for fire door described in the utility model, comprises the first upper limit position switch and the second upper limit position switch that are fixed on both sides, Furnace door frame top; Normally opened contact S1, S2 of first, second upper limit position switch described are positioned on same level line, normally opened contact S1 and the first control relay K1 coil of the first upper limit position switch form the first series arm, and normally opened contact S2 and the second control relay K2 coil of the second upper limit position switch form the second series arm; Normally-closed contact j11, j21 of described first, second control relay K1, K2 are series in the lifting control circuit of fire door lifting motor M; The normally-closed contact j12 of the first control relay K1, the normally opened contact j22 of the second control relay K2 and the first alarm relay KT1 coil composition the 3rd series arm; The normally opened contact j13 of the first control relay K1, the normally-closed contact j23 of the second control relay K2 and the second warning relay K T2 coil composition the 4th series arm; The time delay closed contact T1 and first sound light crossing-signal P1 that often opens of described first alarm relay KT1 forms the 5th series arm; The time delay closed contact T2 and rising tone light crossing-signal P2 that often opens of described second warning relay K T2 forms the 6th series arm; Described first, second, third, fourth, the 5th and the 6th series arm forms parallel branch mutually.

The utility model advantage is the security ensureing that trolley type annealing furnace fire door opens and closes, when any one of first, second upper limit position switch described break down be failure to actuate time by automatic discrimination, and carry out sound and light alarm prompting workman's inspection and change travel switch, avoid when existing fire door only damages with a upper limit position switch and cause fire door to exceed the problem of stroke.

Accompanying drawing explanation

Fig. 1 is circuit theory diagrams of the present utility model.

Fig. 2 is the layout schematic diagram of the first upper limit position switch described in the utility model and the second upper limit position switch.

Fig. 3 is the power circuit principle figure of fire door lifting motor described in the utility model.

Fig. 4 is the control circuit schematic diagram of fire door lifting motor described in the utility model.

Detailed description of the invention

As Figure 1-4, the two-pass switch limit alarm device for fire door described in the utility model, comprises the first upper limit position switch 2 and the second upper limit position switch 3 being fixed on both sides, Furnace door frame 1 top; Normally opened contact S1, S2 of first, second upper limit position switch 2,3 are positioned on same level line.As shown in Figure 1, normally opened contact S1 and the first control relay K1 coil of the first upper limit position switch 2 form the first series arm, and normally opened contact S2 and the second control relay K2 coil of the second upper limit position switch 3 form the second series arm; As shown in Figure 4, normally-closed contact j11, j21 of first, second control relay K1, K2 are series in the lifting control circuit of fire door lifting motor M; As shown in Figure 1, the normally-closed contact j12 of the first control relay K1, the normally opened contact j22 of the second control relay K2 and the first alarm relay KT1 coil composition the 3rd series arm; The normally opened contact j13 of the first control relay K1, the normally-closed contact j23 of the second control relay K2 and the second warning relay K T2 coil composition the 4th series arm; The time delay closed contact T1 and first sound light crossing-signal P1 that often opens of the first alarm relay KT1 forms the 5th series arm; The time delay closed contact T2 and rising tone light crossing-signal P2 that often opens of the second warning relay K T2 forms the 6th series arm; Described first, second, third, fourth, the 5th and the 6th series arm forms parallel branch mutually.

Utility model works principle is summarized as follows: under normal circumstances, when fire door 4 rising arrives the upper limit of setting, the action simultaneously of first, second upper limit position switch 2,3, normally opened contact S1, S2 are closed, be series at normally-closed contact j11, j21 disconnection that fire door lifting motor M promotes first, second control relay K1, K2 in control circuit, namely fire door 4 stops automatically.

When one of them upper limit position switch damages, now damage for the first upper limit position switch 2, fire door 4 only has the second upper limit position switch 3 action when arriving upper limit, as Fig. 1,3, shown in, the normally opened contact S2 of the second upper limit position switch 3 closes, and the second control relay K2 obtains electric, its normally-closed contact j21 disconnects, fire door vertical relay KM1 dead electricity, its normally opened contact KM11 disconnects the power circuit of fire door lifting motor M, and fire door lifting motor M power-off quits work.Simultaneously, because the first upper limit position switch 2 damages, its normally opened contact S1 is still in off-state, normally-closed contact j12 in 3rd series arm is still in closure state and normally opened contact j22 closes, first alarm relay KT1 coil obtains electric, it is often opened time delay closed contact T1 time delay and closes for 3 seconds, and first sound light crossing-signal P1 alert notice maintainer first upper limit position switch 2 damages.

In like manner, when second upper limit position switch 3 damages, normally-closed contact j23 in 4th series arm is still in closure state and normally opened contact j13 closes, second warning relay K T2 coil obtains electric, it is often opened time delay closed contact T2 time delay and closes for 3 seconds, and rising tone light crossing-signal P2 alert notice maintainer second upper limit position switch 3 damages.

Select often to open the object of time delay closed contact T1, T2, the time difference issuable false alarm of first, second upper limit position switch 2,3 action when being to prevent normal condition lower furnace door 4 from arriving upper limit.

Claims

1., for a two-pass switch limit alarm device for fire door, comprise the first upper limit position switch and the second upper limit position switch that are fixed on both sides, Furnace door frame top; It is characterized in that: normally opened contact S1, S2 of first, second upper limit position switch described are positioned on same level line, normally opened contact S1 and the first control relay K1 coil of the first upper limit position switch form the first series arm, and normally opened contact S2 and the second control relay K2 coil of the second upper limit position switch form the second series arm; Normally-closed contact j11, j21 of described first, second control relay K1, K2 are series in the lifting control circuit of fire door lifting motor M; The normally-closed contact j12 of the first control relay K1, the normally opened contact j22 of the second control relay K2 and the first alarm relay KT1 coil composition the 3rd series arm; The normally opened contact j13 of the first control relay K1, the normally-closed contact j23 of the second control relay K2 and the second warning relay K T2 coil composition the 4th series arm; The time delay closed contact T1 and first sound light crossing-signal P1 that often opens of described first alarm relay KT1 forms the 5th series arm; The time delay closed contact T2 and rising tone light crossing-signal P2 that often opens of described second warning relay K T2 forms the 6th series arm; Described first, second, third, fourth, the 5th and the 6th series arm forms parallel branch mutually.