Single-button control circuit with monitoring function

Abstract

The utility model discloses a single button control circuit with a monitoring function, a first control circuit comprises a switch of a circuit breaker QF, a button SB, a normally closed contact of a main loop contactor KM, a coil of a first intermediate relay KA1 and a normally closed contact of a second intermediate relay KA2 which are sequentially connected in series; a normally closed contact of the main loop contactor KM is connected in parallel with a normally open contact of a first intermediate relay KA1; the second control circuit comprises a normally open contact of a main loop contactor KM, a coil of a second intermediate relay KA2 and a normally closed contact of the first intermediate relay KA1 which are sequentially connected in series, and the normally open contact of the main loop contactor KM is connected with the normally open contact of the second intermediate relay KA2 in parallel; the third control circuit comprises a normally-closed contact of the thermal relay FR, a normally-closed contact of the second intermediate relay KA2, a normally-open contact of the first intermediate relay KA1 and a coil of the main loop contactor KM which are sequentially connected in series, and the normally-open contact of the first intermediate relay KA1 is connected with the normally-open contact of the main loop contactor KM in parallel.

Description

Technical Field

[0001] The utility model relates to the technical field of coal mines, in particular to a single-button control circuit with a monitoring function. Background Art

[0002] All electrical equipment in open-pit coal mines needs to use explosion-proof electric control boxes. The start and stop of the electrical equipment can be achieved through the control circuit inside the explosion-proof electric control box and the control buttons on the surface of the explosion-proof electric control box.

[0003] The working environment of open-pit coal mines is dusty and visibility is low. However, the current explosion-proof electric control box has too many control buttons on the surface, which is not conducive to operator operation. Especially at night when visibility is not good, operators often confuse the start button and the stop button, which often affects production and causes mistakes. At the same time, due to the large amount of dust on site, once the button is corroded, it is not conducive to maintenance. Therefore, for simple electrical equipment, it is entirely possible to design a control circuit that can start and stop the electrical equipment with one button. Utility Model Content

[0004] The utility model aims to provide a single-button control circuit with a monitoring function.

[0005] The utility model is implemented by the following technical scheme: a single-button control circuit with a monitoring function comprises a first control circuit, a second control circuit, and a third control circuit;

[0006] The first control circuit includes a switch of a circuit breaker QF, a button SB, a normally closed contact of a main circuit contactor KM, a coil of a first intermediate relay KA1, and a normally closed contact of a second intermediate relay KA2, which are sequentially arranged in series. The normally closed contact of the main circuit contactor KM is connected in parallel with the normally open contact of the first intermediate relay KA1.

[0007] The second control circuit is connected in parallel between the normally closed contact of the main circuit contactor KM, the coil of the first intermediate relay KA1, and the normally closed contact of the second intermediate relay KA2 in the first control circuit;

[0008] The second control circuit includes a normally open contact of the main circuit contactor KM, a coil of the second intermediate relay KA2, and a normally closed contact of the first intermediate relay KA1, which are arranged in series in sequence. The normally open contact of the main circuit contactor KM is connected in parallel with the normally open contact of the second intermediate relay KA2.

[0009] The third control circuit is connected in parallel between the button SB in the first control circuit, the normally closed contact of the main circuit contactor KM, the coil of the first intermediate relay KA1, and the normally closed contact of the second intermediate relay KA2;

[0010] The third control circuit includes a normally closed contact of a thermal relay FR, a normally closed contact of a second intermediate relay KA2, a normally open contact of a first intermediate relay KA1, and a coil of the main circuit contactor KM which are arranged in series in sequence, and the normally open contact of the first intermediate relay KA1 is connected in parallel with the normally open contact of the main circuit contactor KM.

[0011] Furthermore, the third control circuit is connected in parallel with a fourth control circuit, and the fourth control circuit includes a normally closed contact of a main circuit contactor KM and a first indicator light HL1 which are sequentially connected in series.

[0012] Furthermore, the first indicator light is connected in parallel with a fifth control circuit, and the fifth control circuit includes a normally closed contact of a first intermediate relay and a second indicator light HL2 which are sequentially connected in series.

[0013] Furthermore, the fourth control circuit is connected in parallel with a sixth control circuit, and the sixth control circuit includes a normally open contact of a main circuit contactor KM and a third indicator light HL3 which are sequentially connected in series.

[0014] Furthermore, the third indicator light HL3 is connected in parallel with a seventh control circuit, and the seventh control circuit includes a normally closed contact of the second intermediate relay KA2 and a fourth indicator light HL4 which are sequentially connected in series.

[0015] The advantages of the utility model are as follows: the first indicator light, the second indicator light, the third indicator light and the fourth indicator light HL4 are reasonably utilized to realize the monitoring of the running status of the motor, and the operation is completed step by step by utilizing the monitoring to reduce the possibility of erroneous operation; at the same time, instructions are given on whether the start and stop operations can be performed, so that the operator can control the motor conveniently, and the starting operation of the motor of the electrical equipment can be completed by one button, and the operation is simple, and the operation can be completed even in a working environment with low visibility, which is simple and convenient, low in cost, and saves manpower and material resources to the maximum extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a schematic diagram of the main circuit of the motor of the utility model;

[0018] Figure 2 It is a schematic diagram of the control circuit of the utility model;

[0019] In the figure: the first control circuit 1, the first control circuit 1, the second control circuit 2, the third control circuit 3, the fourth control circuit 4, the fifth control circuit 5, the sixth control circuit 6, the seventh control circuit 7, the motor M of the electrical equipment, the main circuit contactor KM, the first intermediate relay KA1, the first indicator light HL1, the indicator light HL2, the third indicator light HL3, the fourth indicator light HL4, the button SB, the second intermediate relay KA2, and the control switch QF. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] like Figure 1-2 As shown, a single-button control circuit with a monitoring function includes a first control circuit 1, a second control circuit 2, and a third control circuit 3;

[0022] The first control circuit 1 includes a switch of a circuit breaker QF, a button SB, a normally closed contact of a main circuit contactor KM, a coil of a first intermediate relay KA1, and a normally closed contact of a second intermediate relay KA2, which are arranged in series in sequence. The normally closed contact of the main circuit contactor KM is connected in parallel with the normally open contact of the first intermediate relay KA1.

[0023] A second control circuit 2 is connected in parallel between the normally closed contact of the main circuit contactor KM in the first control circuit 1, the coil of the first intermediate relay KA1, and the normally closed contact of the second intermediate relay KA2;

[0024] The second control circuit 2 includes a normally open contact of a main circuit contactor KM, a coil of a second intermediate relay KA2, and a normally closed contact of a first intermediate relay KA1, which are arranged in series in sequence. The normally open contact of the main circuit contactor KM is connected in parallel with the normally open contact of the second intermediate relay KA2.

[0025] A third control circuit 3 is connected in parallel between the button SB in the first control circuit 1, the normally closed contact of the main circuit contactor KM, the coil of the first intermediate relay KA1, and the normally closed contact of the second intermediate relay KA2;

[0026] The third control circuit 3 includes a normally closed contact of a thermal relay FR, a normally closed contact of a second intermediate relay KA2, a normally open contact of a first intermediate relay KA1, and a coil of a main circuit contactor KM which are arranged in series in sequence. The normally open contact of the first intermediate relay KA1 is connected in parallel with the normally open contact of the main circuit contactor KM.

[0027] The third control circuit 3 is connected in parallel with a fourth control circuit 4 , and the fourth control circuit 4 includes a normally closed contact of a main circuit contactor KM and a first indicator light HL1 which are sequentially connected in series.

[0028] The first indicator light is connected in parallel with a fifth control circuit 5 , which includes a normally closed contact of a first intermediate relay and a second indicator light HL2 which are sequentially connected in series.

[0029] The fourth control circuit 4 is connected in parallel with a sixth control circuit 6 , which includes a normally open contact of a main circuit contactor KM and a third indicator light HL3 which are sequentially connected in series.

[0030] The third indicator light HL3 is connected in parallel with a seventh control circuit 7 , and the seventh control circuit 7 includes a normally closed contact of a second intermediate relay KA2 and a fourth indicator light HL4 which are sequentially connected in series.

[0031] The first indicator light HL1, the second indicator light HL2, the third indicator light HL3 and the fourth indicator light HL4 are reasonably used to monitor the running status of the motor, and the operation is completed step by step by monitoring to reduce the possibility of erroneous operation; at the same time, instructions are given on whether the start and stop operations can be performed, which is convenient for operators to control the motor. The start operation of the motor of the electrical equipment is completed by one button. The operation is simple and can be completed even in working environments with low visibility. It is simple and convenient, low cost, and saves manpower and material resources to the maximum extent.

[0032] The specific operation process of this embodiment;

[0033] 1. Startup process:

[0034] Close the control switch QF;

[0035] Fourth control circuit 4: the normally closed contact of the main circuit contactor KM is in a closed state, and the first indicator light HL1 is on. The first indicator light HL1 is on, indicating that the motor M of the electrical equipment is currently in a stopped state;

[0036] Fifth control circuit 5: Since the normally closed contact of the first intermediate relay KA1 is in a closed state, the second indicator light HL2 is on, and the second indicator light HL2 is on, indicating that the motor M of the electrical equipment is currently allowed to start.

[0037] First control circuit 1: Press the button SB to energize the coil of the first intermediate relay KA1, close the normally open contact of the first intermediate relay KA1, and the coil of the first intermediate relay KA1 becomes self-locking;

[0038] Third control circuit 3: At this time, the normally open contact of the first intermediate relay KA1 is closed instantly, the coil of the main circuit contactor KM is energized and self-locked, and at the same time, the normally open contact of the main circuit contactor KM is closed, and the motor M starts to run;

[0039] 2. Stable operation process:

[0040] First control circuit 1: the normally open contact of the first intermediate relay KA1 is closed, so that the coil of the first intermediate relay KA1 is energized and self-locked;

[0041] Second control circuit 2: the normally closed contact of the first intermediate relay KA1 is disconnected, and the coil of the second intermediate relay KA2 is de-energized;

[0042] Third control circuit 3: The normally closed contact of the second intermediate relay KA2 is always in a closed state, ensuring the stable operation of the motor M of the electrical equipment;

[0043] Sixth control circuit 6: When the motor is running, the normally open contact of the main circuit contactor KM is in a closed state, and the third indicator light HL3 is on. The third indicator light HL3 is on, indicating that the motor is in a running state;

[0044] Seventh control circuit 7: the normally closed contact of the second intermediate relay KA2 is in a closed state, the fourth indicator light HL4 is on, and the fourth indicator light HL4 is on, indicating that stopping is allowed;

[0045] 3. Stop process

[0046] First control line 1: press button SB;

[0047] Second control circuit 2: Since the motor M of the electrical equipment is running, the coil of the main circuit contactor KM is energized, so the normally open contact of the main circuit contactor KM is in a closed state, so the coil of the second intermediate relay KA2 is energized, and at the same time, the normally open contact of the second intermediate relay KA2 is closed, and the coil of the second intermediate relay KA2 is in a self-locking state;

[0048] The third control circuit 3: the normally closed contact of the second intermediate relay KA2 is disconnected, the coil of the main circuit contactor KM loses power, and the motor M of the electrical equipment stops running.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A single button control circuit with monitoring function, characterized in that: It includes a first control circuit, a second control circuit, and a third control circuit; The first control circuit includes a switch of a circuit breaker QF, a button SB, a normally closed contact of a main circuit contactor KM, a coil of a first intermediate relay KA1, and a normally closed contact of a second intermediate relay KA2, which are sequentially arranged in series. The normally closed contact of the main circuit contactor KM is connected in parallel with the normally open contact of the first intermediate relay KA1. The second control circuit is connected in parallel between the normally closed contact of the main circuit contactor KM, the coil of the first intermediate relay KA1, and the normally closed contact of the second intermediate relay KA2 in the first control circuit; The second control circuit includes a normally open contact of the main circuit contactor KM, a coil of the second intermediate relay KA2, and a normally closed contact of the first intermediate relay KA1, which are arranged in series in sequence. The normally open contact of the main circuit contactor KM is connected in parallel with the normally open contact of the second intermediate relay KA2. The third control circuit is connected in parallel between the button SB in the first control circuit, the normally closed contact of the main circuit contactor KM, the coil of the first intermediate relay KA1, and the normally closed contact of the second intermediate relay KA2; The third control circuit includes a normally closed contact of a thermal relay FR, a normally closed contact of a second intermediate relay KA2, a normally open contact of a first intermediate relay KA1, and a coil of the main circuit contactor KM which are arranged in series in sequence, and the normally open contact of the first intermediate relay KA1 is connected in parallel with the normally open contact of the main circuit contactor KM.

2. The single-button control circuit with monitoring function according to claim 1, characterized in that: The third control circuit is connected in parallel with a fourth control circuit, and the fourth control circuit includes a normally closed contact of a main circuit contactor KM and a first indicator light HL1 which are sequentially connected in series.

3. The single-button control circuit with monitoring function according to claim 2, characterized in that: The first indicator light is connected in parallel with a fifth control circuit, and the fifth control circuit includes a normally closed contact of a first intermediate relay and a second indicator light HL2 which are sequentially connected in series.

4. The single-button control circuit with monitoring function according to claim 3, characterized in that: The fourth control circuit is connected in parallel with a sixth control circuit, and the sixth control circuit includes a normally open contact of a main circuit contactor KM and a third indicator light HL3 which are sequentially connected in series.

5. The single-button control circuit with monitoring function according to claim 4, characterized in that: The third indicator light HL3 is connected in parallel with a seventh control circuit, and the seventh control circuit includes a normally closed contact of a second intermediate relay KA2 and a fourth indicator light HL4 which are sequentially connected in series.

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