CN203086099U - Alarm protective device for main contact adhesion of alternating-current contactor - Google Patents

Abstract

The utility model relates to an alarm protective device for main contact adhesion of an alternating-current contactor. The alarm protective device comprises a contactor main loop, a contactor control loop connected with the contactor main loop, and a signal processing and operation circuit respectively connected with the contactor main loop and the contactor control loop. Besides, the signal input terminal of the signal processing and operation circuit is respectively connected to the power input terminal of the contactor main loop and an output terminal of an alternating-current contactor main loop; and the signal output terminal of the signal processing and operation circuit is connected with a breaker shunt excitation coil loop in the contactor control loop. According to the utility model, the connection and disconnection state of the main contacts of the contactor can be monitored in real time. Once the adhesion phenomenon occurs, the power supply is cut off, so that the security of the staff and the equipment can be well protected and the property loss can be avoided. Especially, in the special working environment of the hoisting equipment, the utilization of the alarm protective device enables the contact adhesion phenomenon occurring frequently to be avoided, thereby avoiding the accident. Therefore, the application of the alarm protective device enables the accident rate to be substantially reduced.

Description

A.C. contactor main contact adhesion alarm protecting apparatus

Technical field

The utility model relates to a kind of A.C. contactor, particularly relates to a kind of A.C. contactor main contact adhesion alarm protecting apparatus.

Background technology

A.C. contactor is a kind of routine operation device that is applicable to the control of power drive electric power system on/off.Can finish connection, the breaking operation of main power supply circuits and big volume controlled circuit, realize as the startup of alternating current machine, all kinds of loads such as capacity driving control device, building automatic control, power network compensation control greatly, stop.

When A.C. contactor is used in AC-4 class load behavior, for example: when driving the motor that suspension hook lifting/lowering, trolley move left and right, girder move forward and backward in the hoisting equipment, often be in the operating state of frequent " forward starts, moves, stops, and oppositely starts, moves, stops ".Because its special working method requirement, make A.C. contactor often work in frequent connection, off-state, cause main noddle on contactor to bear operating current greater than the rated current several times in the moment that switches on and off, therefore, main noddle on contactor very easily sticks together.In case come in contact the adhesion of device main contact, actuation means can't turn-off the motor that is moving, security incidents such as collision very easily take place.Particularly in hoisting equipment decline process if stick together, can cause accidents such as injury to personnel, cargo damage to take place.

A.C. contactor main contact adhesion alarm protecting apparatus mainly is to monitor the main noddle on contactor on off operating mode in real time.In case stick together, this alarm protecting apparatus sends emergent control signal immediately, disconnects the power supply of drive motors, stops machine operation.Send alarm signal simultaneously, prevent to cause security incident.

Summary of the invention

The utility model is for solving the technical problem that exists in the known technology; provide a kind of for solving the accident that the adhesion of A.C. contactor contact causes, better protection staff safely, the A.C. contactor main contact adhesion alarm protecting apparatus of avoiding property to incur loss.

The technical scheme that the utility model is taked for the technical problem that exists in the solution known technology is: a kind of A.C. contactor main contact adhesion alarm protecting apparatus; the contactor control loop that includes the contactor major loop and be connected with the contactor major loop; also have respectively signal processing and computing circuit with contactor major loop and contactor control loop associated; wherein; the signal input part of described signal processing and computing circuit is taken from the power input of contactor major loop and the output of A.C. contactor major loop respectively, and the signal output part of described signal processing and computing circuit connects the circuit breaker shunt opening wire loop in the contactor control loop.

Described contactor major loop includes the circuit breaker Q 1 that is connected with the three phase supply power supply, and the other end of described circuit breaker Q 1 connects the main contact of contactor KM1, the three-phase voltage U of the other end output of the main contact of described contactor KM1 _A, U _B, U _CConnect motor M, described this three-phase voltage U by thermal relay RJ _A, U _B, U _CAlso respectively draw the signal input part of end connection signal processing and computing circuit respectively, the A in the described three phase supply power supply draws the signal input part that an end is connected signal processing and computing circuit respectively mutually with N mutually.

Described contactor control loop includes first normally opened contact that constitutes contactor break-make and continuous start button SF, the normally closed auxiliary contact of the coil of contactor KM1 and thermal relay RJ, second normally opened contact of the start button SF that constitutes the button closure signal and be connected and the coil of auxiliary relay J1, the normally opened contact of the relay K 1 that constitutes circuit breaker tripping and be connected and the shunt opening coil of circuit breaker Q 1, wherein, first normally opened contact of described start button SF, the other end of second normally opened contact and the normally opened contact of relay K 1 is connected an end of 220V power supply, the normally closed auxiliary contact of described thermal relay RJ, the other end of the shunt opening coil of the coil of auxiliary relay J1 and circuit breaker Q 1 is connected the other end of 220V power supply.

Described signal processing and computing circuit include the signal processing unit that connects successively, logical operation circuit, pull-in relay circuit, switching value signal and contactor control loop, described signal processing unit is useful on the terminal S4-2 that connects the three-phase voltage signal of contactor KM1 main contact output in the contactor major loop, S5-2, the first terminal S4 of S6-2, the second terminal S5 and the 3rd terminal S6, and the terminal S7-2 that draws respectively mutually with N mutually of the A that is used for connecting the three phase supply power supply, the power supply terminal S7 of S7-1, described the first terminal S4, the second terminal S5 and the 3rd terminal S6 respectively isolate transformation by one respectively, is connected the contactor control loop by logical operation circuit and pull-in relay circuit output pair of switches amount signal successively again behind rectification and the voltage stabilizing circuit, the button closure cut-off switch amount signal in the described contactor control loop connects logical operation circuit by photoelectric isolating circuit; Described power supply terminal S7 is successively by Signal Spacing transformer T4, rectifier bridge D4 and pressurizer U13 output+5V power supply; The output of described logic judging circuit also connects the light-emitting diode D15 that is used to report to the police by resistance R 215.

Described isolation transformation, rectification and voltage stabilizing circuit include the Signal Spacing transformer T1 of serial connection successively, rectifier bridge D1 and pressurizer U10, and the two ends of described pressurizer U10 are each electric capacity E1, an E2 in parallel respectively.

Described logical operation circuit includes input and connects the voltage signal logic OR U23A that three isolation transformations, rectification and voltage stabilizing circuits are exported, the output of described logic OR U23A connects the input of logic XOR U20A, another input of logic XOR U20A connects the output of photoelectric isolating circuit, and the output of described logic XOR U20A connects pull-in relay circuit respectively and is connected the light-emitting diode D15 that is used to report to the police by resistance R 215.

Described pull-in relay circuit includes the coil of relay K 1, end after the coil of described relay K 1 and the diode D5 parallel connection is connected+the 5V power supply, the other end connects the output of the logic XOR U20A in the logical operation circuit by resistance R K1, and the normally-open normally-close contact of described relay K 1 is connected with the second terminal S2 in the circuit breaker tripping loop in the contactor control loop by the first terminal S1 respectively.

A.C. contactor main contact adhesion alarm protecting apparatus of the present utility model, the advantage and the good effect that have are: monitor the main noddle on contactor on off operating mode in real time, cut off the electricity supply immediately in case stick together.Can be good at solving the accident that causes owing to the probe of contactor adhesion, the safety of better protection staff and equipment avoids property to incur loss.Particularly under this special operational environment of hoisting equipment, probe of contactor very easily causes adhesion, causes security incident.The application of this invention can reduce rate of failure greatly.

Description of drawings

Fig. 1 is the circuit theory diagrams of contactor major loop in the utility model;

Fig. 2 a is the circuit theory diagrams of contactor control loop in the utility model;

Fig. 2 b is the normally opened contact of Fig. 2 a repeat circuit J1;

Fig. 3 is the circuit theory diagrams of signal processing and computing circuit in the utility model;

Fig. 4 a is the block diagram of the power unit of signal processing and computing circuit in the utility model;

Fig. 4 b is the formation block diagram of signal processing and computing circuit in the utility model.

Among the figure

1: contactor major loop 2: the contactor control loop

3: signal processing unit 4: logical operation circuit

5: pull-in relay circuit 6: the switching value signal

7: the closed cut-off switch amount of button signal 8: photoelectric isolating circuit

Embodiment

For further understanding summary of the invention, characteristics and the effect of A.C. contactor main contact adhesion alarm protecting apparatus of the present utility model, enumerate following example now, and conjunction with figs. is described in detail as follows:

As Fig. 1; Fig. 2; shown in Figure 3; A.C. contactor main contact adhesion alarm protecting apparatus of the present utility model; the contactor control loop 2 that includes contactor major loop 1 and be connected with contactor major loop 1; also have respectively signal processing and computing circuit with contactor major loop 1 and contactor control loop 2 associated; wherein; the signal input part of described signal processing and computing circuit is taken from the power input of contactor major loop 1 and the output of A.C. contactor major loop respectively, and the signal output part of described signal processing and computing circuit connects the circuit breaker shunt opening wire loop in the contactor control loop 2.

As shown in Figure 1, described contactor major loop 1 includes the circuit breaker Q 1 that is connected with the three phase supply power supply, described circuit breaker Q 1 the other end connect the main contact of contactor KM1, the three-phase voltage U of the other end output of the main contact of described contactor KM1 _A, U _B, U _CConnect motor M, described this three-phase voltage U by thermal relay RJ _A, U _B, U _CAlso respectively draw the signal input part of an end S4-2, S5-2, S6-2 connection signal processing and computing circuit respectively, the A in the described three phase supply power supply draws the signal input part that an end S7-2, S7-1 are connected signal processing and computing circuit respectively mutually with N mutually.

As shown in Figure 2, described contactor control loop 2 includes first normally opened contact 13 and 14 that constitutes contactor break-make and continuous start button SF, the normally closed auxiliary contact of the coil of contactor KM1 and thermal relay RJ, second normally opened contact 23 of the start button SF that constitutes the button closure signal and be connected and 24 and the coil of auxiliary relay J1, the normally opened contact of the relay K 1 that constitutes circuit breaker tripping and be connected and the shunt opening coil of circuit breaker Q 1, wherein, first normally opened contact 13 and 14 of described start button SF, second normally opened contact 23 is connected an end of 220V power supply, the normally closed auxiliary contact of described thermal relay RJ with 24 and the other end of the normally opened contact of relay K 1, the other end of the shunt opening coil of the coil of auxiliary relay J1 and circuit breaker Q 1 is connected the other end of 220V power supply.

As Fig. 3, Fig. 4 a, shown in Fig. 4 b, described signal processing and computing circuit include the signal processing unit 3 that connects successively, logical operation circuit 4, pull-in relay circuit 5, switching value signal 6 and contactor control loop 2, described signal processing unit 3 is useful on the terminal S4-2 that connects the three-phase voltage signal of contactor KM1 main contact output in the contactor major loop 1, S5-2, S6-2, the first terminal S4, the second terminal S5 and the 3rd terminal S6, and the terminal S7-2 that draws respectively mutually with N mutually of the A that is used for connecting the three phase supply power supply, the power supply terminal S7 of S7-1, described the first terminal S4, the second terminal S5 and the 3rd terminal S6 respectively isolate transformation by one respectively, is connected contactor control loop 2 by logical operation circuit 4 and pull-in relay circuit 5 output pair of switches amount signals 6 successively again behind rectification and the voltage stabilizing circuit, the closed cut-off switch amount of the button in the described contactor control loop 2 signal 7 is by photoelectric isolating circuit 8 connection logical operation circuits 4; Described power supply terminal S7 is successively by Signal Spacing transformer T4, rectifier bridge D4 and pressurizer U13 output+5V power supply; The output of described logic judging circuit 4 also connects the light-emitting diode D15 that is used to report to the police by resistance R 215.

Described isolation transformation, rectification and voltage stabilizing circuit include the Signal Spacing transformer T1 of serial connection successively, rectifier bridge D1 and pressurizer U10, and the two ends of described pressurizer U10 are each electric capacity E1, an E2 in parallel respectively.

Described logical operation circuit 4 includes input and connects three logic OR U23A that isolate the voltage signal that transformation, rectification and voltage stabilizing circuits export, the output of described logic OR U23A connects the input of logic XOR U20A, another input of logic XOR U20A connects the output of photoelectric isolating circuit 8, and the output of described logic XOR U20A connects pull-in relay circuit 5 respectively and is connected the light-emitting diode D15 that is used to report to the police by resistance R 215.

Described pull-in relay circuit 5 includes the coil of relay K 1, end after the coil of described relay K 1 and the diode D5 parallel connection is connected+the 5V power supply, the other end is by the output of the logic XOR U20A in the resistance R K1 connection logic judging circuit 4, and the normally-open normally-close contact of described relay K 1 is connected in the circuit breaker tripping loop in the contactor control loop 2 with the second terminal S2 (this normally-closed contact is standby) by the first terminal S1 respectively.

The control method that is used for A.C. contactor main contacts adhesion alarm protecting apparatus of the present utility model comprises the steps:

1) signals collecting

Main noddle on contactor end opening voltage signal U _A, U _B, U _C

Wherein: U _A---A phase voltage, 220V

U _B---B phase voltage, 220V

U _C---C phase voltage, 220V

The switching value signal fout1 of button closure, disconnection;

2) signal processing

With U _A, U _B, U _CVoltage signal carries out respectively: isolate transformation (220V/6V), diode rectification (becoming direct current 8.5V voltage signal after the rectification), voltage stabilizing (outputting standard 5V voltage signal) processing, obtain signal U _a, U _b, U _c

Switching value signal fout1 is carried out obtaining the fout2 signal after photoelectricity is isolated;

3) logical operation

With signal U _a, U _b, U _cCarry out logic OR, obtain: the Fout3 signal

Fout3=U _a+U _b+U _c

Again fout2 signal and Fout3 signal are carried out the logic XOR, obtain the Fout4 signal

$\mathrm{Fout}4=\mathrm{<figure-callout\; id="2"\; label="fout"\; filenames="DEST\_PATH\_HDA00002889058000021.png,DEST\_PATH\_HDA00002889058000031.png"\; state="\{\{state\}\}">fout</figure-callout>}2\&CirclePlus;\mathrm{<figure-callout\; id="3"\; label="Fout"\; filenames="DEST\_PATH\_HDA00002889058000031.png"\; state="\{\{state\}\}">Fout</figure-callout>}3$

The Fout4 operation result is analyzed;

Described fout2, Fout3 and Fout4 signal are analyzed is:

(1) when motor is not worked: button is not closed, fout2=0, U simultaneously _a=0, U _b=0, U _c=0

Fout3=U _a+U _b+U _c=0

$\mathrm{Fout}4=\mathrm{<figure-callout\; id="2"\; label="fout"\; filenames="DEST\_PATH\_HDA00002889058000021.png,DEST\_PATH\_HDA00002889058000031.png"\; state="\{\{state\}\}">fout</figure-callout>}2\&CirclePlus;\mathrm{<figure-callout\; id="3"\; label="Fout"\; filenames="DEST\_PATH\_HDA00002889058000031.png"\; state="\{\{state\}\}">Fout</figure-callout>}3=0$

This kind state belongs to normal condition, the output of not reporting to the police;

(2) when machine operation: the button contactor is inhaled closed, fout2=1, U simultaneously _a=1, U _b=1, U _c=1

Fout3=U _a+U _b+U _c=1

$\mathrm{Fout}4=\mathrm{<figure-callout\; id="2"\; label="fout"\; filenames="DEST\_PATH\_HDA00002889058000021.png,DEST\_PATH\_HDA00002889058000031.png"\; state="\{\{state\}\}">fout</figure-callout>}2\&CirclePlus;\mathrm{<figure-callout\; id="3"\; label="Fout"\; filenames="DEST\_PATH\_HDA00002889058000031.png"\; state="\{\{state\}\}">Fout</figure-callout>}3=0$

This kind state belongs to normal condition, the output of not reporting to the police;

(3) when motor quits work: fout2=0, probe of contactor adhesion, U _a, U _b, U _cIt is 1 that one phase or polyphase signa are wherein arranged

Fout3=U _a+U _b+U _c=1

$\mathrm{Fout}4=\mathrm{<figure-callout\; id="2"\; label="fout"\; filenames="DEST\_PATH\_HDA00002889058000021.png,DEST\_PATH\_HDA00002889058000031.png"\; state="\{\{state\}\}">fout</figure-callout>}2\&CirclePlus;\mathrm{<figure-callout\; id="3"\; label="Fout"\; filenames="DEST\_PATH\_HDA00002889058000031.png"\; state="\{\{state\}\}">Fout</figure-callout>}3=1$

This kind state belongs to malfunction, the output of reporting to the police.

4) fault alarm

When the Fout4 signal was 1, alarm lamp was bright; Relay K 1 adhesive simultaneously, output pair of switches amount signal.

In the contactor control loop, after relay K 1 normal battle of closure, circuit breaker Q 1 shunt opening coil electricity, circuit breaker Q 1 disconnects, the outage of contactor main circuit power.

Claims (7)

1. A.C. contactor main contact adhesion alarm protecting apparatus; the contactor control loop (2) that includes contactor major loop (1) and be connected with contactor major loop (1); it is characterized in that; also have respectively signal processing and computing circuit with contactor major loop (1) and contactor control loop (2) associated; wherein; the signal input part of described signal processing and computing circuit is taken from the power input of contactor major loop (1) and the output of A.C. contactor major loop respectively, and the signal output part of described signal processing and computing circuit connects the circuit breaker shunt opening wire loop in the contactor control loop (2).

2. A.C. contactor main contact adhesion alarm protecting apparatus according to claim 1; it is characterized in that; described contactor major loop (1) includes the circuit breaker Q 1 that is connected with the three phase supply power supply; the other end of described circuit breaker Q 1 connects the main contact of contactor KM1, the three-phase voltage U of the other end output of the main contact of described contactor KM1 _A, U _B, U _CConnect motor M, described this three-phase voltage U by thermal relay RJ _A, U _B, U _CAlso respectively draw the signal input part of an end S4-2, S5-2, S6-2 connection signal processing and computing circuit respectively, the A in the described three phase supply power supply draws the signal input part that an end S7-2, S7-1 are connected signal processing and computing circuit respectively mutually with N mutually.

3. A.C. contactor main contact adhesion alarm protecting apparatus according to claim 1; it is characterized in that; described contactor control loop (2) includes first normally opened contact (13 that constitutes contactor break-make and continuous start button SF; 14); the normally closed auxiliary contact of the coil of contactor KM1 and thermal relay RJ; second normally opened contact (23 of the start button SF that constitutes the button closure signal and be connected; 24) and the coil of auxiliary relay J1; the normally opened contact of the relay K 1 that constitutes circuit breaker tripping and be connected and the shunt opening coil of circuit breaker Q 1; wherein; first normally opened contact of described start button SF; the other end of second normally opened contact and the normally opened contact of relay K 1 is connected an end of 220V power supply, the normally closed auxiliary contact of described thermal relay RJ; the other end of the shunt opening coil of the coil of auxiliary relay J1 and circuit breaker Q 1 is connected the other end of 220V power supply.

4. A.C. contactor main contact adhesion alarm protecting apparatus according to claim 1, it is characterized in that, described signal processing and computing circuit include the signal processing unit (3) that connects successively, logical operation circuit (4), pull-in relay circuit (5), switching value signal (6) and contactor control loop (2), described signal processing unit (3) is useful on the terminal S4-2 that connects the three-phase voltage signal of contactor KM1 main contact output in the contactor major loop (1), S5-2, the first terminal S4 of S6-2, the second terminal S5 and the 3rd terminal S6, and the terminal S7-2 that draws respectively mutually with N mutually of the A that is used for connecting the three phase supply power supply, the power supply terminal S7 of S7-1, described the first terminal S4, the second terminal S5 and the 3rd terminal S6 respectively isolate transformation by one respectively, is connected contactor control loop (2) by logical operation circuit (4) and pull-in relay circuit (5) output pair of switches amount signal (6) successively again behind rectification and the voltage stabilizing circuit, the closed cut-off switch amount signal of the button in the described contactor control loop (2) (7) is by photoelectric isolating circuit (8) connection logical operation circuit (4); Described power supply terminal S7 is successively by Signal Spacing transformer T4, rectifier bridge D4 and pressurizer U13 output+5V power supply; The output of described logic judging circuit (4) also connects the light-emitting diode D15 that is used to report to the police by resistance R 215.

5. A.C. contactor main contact adhesion alarm protecting apparatus according to claim 4; it is characterized in that; described isolation transformation, rectification and voltage stabilizing circuit include the Signal Spacing transformer T1 of serial connection successively; rectifier bridge D1 and pressurizer U10, the two ends of described pressurizer U10 are each electric capacity E1, an E2 in parallel respectively.

6. A.C. contactor main contact adhesion alarm protecting apparatus according to claim 4; it is characterized in that; described logical operation circuit (4) includes input and connects three isolation transformations; the voltage signal logic OR U23A that rectification and voltage stabilizing circuit are exported; the output of described logic OR U23A connects the input of logic XOR U20A; another input of logic XOR U20A connects the output of photoelectric isolating circuit (8), and the output of described logic XOR U20A connects pull-in relay circuit (5) respectively and is connected the light-emitting diode D15 that is used to report to the police by resistance R 215.

7. A.C. contactor main contact adhesion alarm protecting apparatus according to claim 4; it is characterized in that; described pull-in relay circuit (5) includes the coil of relay K 1; end after the coil of described relay K 1 and the diode D5 parallel connection is connected+the 5V power supply; the other end connects the output of the logic XOR U20A in the logical operation circuit (4) by resistance R K1, and the normally-open normally-close contact of described relay K 1 is connected with the second terminal S2 in the circuit breaker tripping loop in the contactor control loop (2) by the first terminal S1 respectively.

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