Control circuit of oil-electricity dual-purpose screening and crushing system

Abstract

The utility model discloses an oil-electricity dual-purpose screening and crushing system control circuit which comprises a mains supply power supply main loop, a first intermediate relay KA1, a second intermediate relay KA2, a third intermediate relay KA3, a mains supply control loop, a diesel generator power supply main loop, a self-starting circuit and a mains supply abnormity indication loop. The system has the advantages that the electric equipment of the screening and crushing system takes a diesel generator or a commercial power supply system as a power source, when the commercial power supply system is normal, the commercial power control loop controls the commercial power supply main loop to be switched on to supply power to the electric equipment of the screening and crushing system, and when the commercial power supply system fails, the commercial power abnormity indication loop is switched on to supply power to the electric equipment of the screening and crushing system. And the diesel generator is controlled to start through the self-starting circuit, so that a power supply main loop of the diesel generator is switched on to supply power to electric equipment of the screening and crushing system, the operation of the whole screening and crushing system is ensured, and the continuous production of the coal yard is ensured.

Description

Technical Field:

[0001] The utility model relates to the technical field of oil-electric dual-use control circuits, and particularly relates to a control circuit for an oil-electric dual-use screening and crushing system. Background Art:

[0002] Currently, due to economic costs, most of the screening and crushing systems in coal yards adopt a single power supply system. If the power supply is missing a phase, the electrical equipment will be burned out, or if the power supply system loses power due to some irresistible factors, all the equipment of the entire screening and crushing system will stop, unable to produce, affecting the continuous production of the coal yard and reducing economic benefits. Content of the Utility Model:

[0003] The purpose of the utility model is to provide a control circuit for an oil-electric dual-use screening and crushing system.

[0004] The purpose of the utility model is implemented by the following technical solution: A control circuit for an oil-electric dual-use screening and crushing system, which includes a mains power supply main circuit, a first intermediate relay KA1, a second intermediate relay KA2, a third intermediate relay KA3, a mains power supply control circuit, a diesel generator power supply main circuit, a self-starting circuit, and a mains power supply abnormality indication circuit;

[0005] The mains power supply main circuit supplies power to the electrical equipment of the screening and crushing system. The coils of the first intermediate relay KA1, the second intermediate relay KA2, and the third intermediate relay KA3 are respectively connected to the power supply line of the mains power supply main circuit;

[0006] In the power supply line of the mains power supply control circuit, a first control switch QF3, a normally open contact of the first intermediate relay KA1, a normally open contact of the second intermediate relay KA2, a normally open contact of the third intermediate relay KA3, a stop button SB3, a normally closed contact of the contactor KM2 of the diesel generator, a first start button SB1, and a main contactor KM1 coil are sequentially connected in series; A normally open contact of the main contactor KM1 is connected in parallel at both ends of the first start button SB1; A mains power supply normal indicator light HL1 is connected in parallel at both ends of the series circuit formed by the stop button SB3, the normally closed contact of the contactor KM2 of the diesel generator, the first start button SB1, and the main contactor KM1 coil, constituting the mains power supply control circuit;

[0007] The diesel generator power supply main circuit supplies power to the electrical equipment of the screening and crushing system. The self-starting circuit is connected in parallel at both ends of the second start button SB2 of the diesel generator. The self-starting circuit is formed by connecting the normally closed contact of the main contactor KM1 and the normally closed contact of the contactor KM2 of the diesel generator in series;

[0008] The mains power abnormal indication circuit includes a second control switch QF4, a normally-closed contact of a first intermediate relay KA1, a normally-closed contact of a second intermediate relay KA2, a normally-closed contact of a third intermediate relay KA3, a normally-closed contact of a main contactor KM1, and a mains power abnormal indicator light HL2, which are connected in series in sequence on the diesel generator power supply.

[0009] Preferably, the mains power supply main circuit includes a first circuit breaker QF1, a normally-open contact of the main contactor KM1, and the electrical equipment of the screening and crushing system; the three-phase power supply lines L1, L2, and L3 are connected in series to the first circuit breaker QF1 and the normally-open contact of the main contactor KM1 in sequence, and then connected to the electrical equipment of the screening and crushing system to form the mains power supply main circuit.

[0010] Preferably, the diesel generator power supply main circuit includes a diesel generator, a second circuit breaker QF2, a normally-open contact of the contactor KM2 of the diesel generator, and the electrical equipment of the screening and crushing system; after the second circuit breaker QF2 and the normally-open contact of the contactor KM2 of the diesel generator are connected in series on the power supply line of the diesel generator, and then connected to the electrical equipment of the screening and crushing system to form the diesel generator power supply main circuit.

[0011] Preferably, the mains power abnormal indication circuit further includes a mains power abnormal electric bell HL3, and the mains power abnormal electric bell HL3 is connected in parallel at both ends of the mains power abnormal indicator light HL2.

[0012] Advantages of the present utility model: The present utility model is provided with a mains power supply main circuit, a mains power control circuit, a diesel generator power supply main circuit, a self-starting circuit, and a mains power abnormal indication circuit, which are used in cooperation with a first intermediate relay KA1, a second intermediate relay KA2, and a third intermediate relay KA3. The electrical equipment of the screening and crushing system uses the diesel generator or the mains power supply system as the power source. When the mains power supply system is normal, the mains power control circuit controls the mains power supply main circuit to be connected to supply power to the electrical equipment of the screening and crushing system. When the mains power supply system fails, the mains power abnormal indication circuit is connected to alarm and remind personnel to repair, and the diesel generator is controlled to start through the self-starting circuit, so that the diesel generator power supply main circuit is connected to supply power to the electrical equipment of the screening and crushing system, ensuring the operation of the entire screening and crushing system, and thus ensuring the continuous production of the coal yard. Description of the drawings:

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor.

[0014] Figure 1 It is a circuit diagram of the first intermediate relay KA1, the second intermediate relay KA2, the third intermediate relay KA3, and the main circuit of the mains power supply connected to the three-phase power line.

[0015] Figure 2 It is a circuit diagram of the mains control circuit.

[0016] Figure 3 It is a circuit diagram of the main circuit of the diesel generator power supply.

[0017] Figure 4 It is a circuit diagram of the self-starting line in parallel with the second start button.

[0018] Figure 5 It is a circuit diagram of the mains anomaly indication circuit.

[0019] The markings of the components in the attached drawings are as follows: the main circuit of the mains power supply 1, the mains control circuit 2, the main circuit of the diesel generator power supply 3, the self-starting line 4, the mains anomaly indication circuit 5, the electrical equipment 6 of the screening and crushing system, the first circuit breaker QF1, the main contactor KM1, the first intermediate relay KA1, the second intermediate relay KA2, the third intermediate relay KA3, the first control switch QF3, the stop button SB3, the contactor KM2 of the diesel generator, the first start button SB1, the mains normal indicator light HL1, the second circuit breaker QF2, the second start button SB2, the second control switch QF4, the mains anomaly indicator light HL2, the mains anomaly electric bell HL3. Specific implementation mode:

[0020] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts belong to the scope of protection of the present utility model.

[0021] As Figures 1-5 shown, a control circuit for an oil-electric dual-purpose screening and crushing system includes a mains power supply main circuit 1, a first intermediate relay KA1, a second intermediate relay KA2, a third intermediate relay KA3, a mains control circuit 2, a diesel generator power supply main circuit 3, a self-starting line 4, and a mains anomaly indication circuit 5. Among them, the three intermediate relays are used to monitor the voltage;

[0022] The main power supply circuit 1 from the commercial power is of an existing structure and is mainly used to supply power to the electrical equipment 6 of the screening and crushing system. It includes the first circuit breaker QF1, the normally open contacts of the main contactor KM1, and the electrical equipment 6 of the screening and crushing system. The three-phase power lines L1, L2, and L3 are sequentially connected in series to the first circuit breaker QF1 and the normally open contacts of the main contactor KM1, and then connected to the electrical equipment 6 of the screening and crushing system, forming the main power supply circuit 1 from the commercial power.

[0023] The coils of the first intermediate relay KA1, the second intermediate relay KA2, and the third intermediate relay KA3 are respectively connected to the power lines of the main power supply circuit 1 from the commercial power.

[0024] The commercial power control circuit 2 includes the first control switch QF3, the normally open contacts of the first intermediate relay KA1, the normally open contacts of the second intermediate relay KA2, the normally open contacts of the third intermediate relay KA3, the stop button SB3, the normally closed contacts of the contactor KM2 of the diesel generator, the first start button SB1, the coil of the main contactor KM1, the normally open contacts of the main contactor KM1, and the commercial power normal indicator light HL1. The first control switch QF3, the normally open contacts of the first intermediate relay KA1, the normally open contacts of the second intermediate relay KA2, the normally open contacts of the third intermediate relay KA3, the stop button SB3, the normally closed contacts of the contactor KM2 of the diesel generator, the first start button SB1, and the coil of the main contactor KM1 are sequentially connected in series to the power lines of the commercial power control circuit 2. The normally open contacts of the main contactor KM1 are connected in parallel across the two ends of the first start button SB1. The commercial power normal indicator light HL1 is connected in parallel across the two ends of the series circuit formed by the stop button SB3, the normally closed contacts of the contactor KM2 of the diesel generator, the first start button SB1, and the coil of the main contactor KM1. When the commercial power normal indicator light HL1 is on, it indicates that it is allowed to press the first start button SB1.

[0025] The main power supply circuit 3 from the diesel generator includes the diesel generator, the second circuit breaker QF2, the normally open contacts of the contactor KM2 of the diesel generator, and the electrical equipment 6 of the screening and crushing system. The diesel generator is an important power supply device and usually starts automatically when the normal power supply fails or there is a power outage to provide power to the load. After the second circuit breaker QF2 and the normally open contacts of the contactor KM2 of the diesel generator are connected in series to the power lines of the diesel generator, they are then connected to the electrical equipment 6 of the screening and crushing system, forming the main power supply circuit 3 from the diesel generator. A self-starting circuit 4 is connected in parallel across the two ends of the second start button SB2 of the diesel generator. The self-starting circuit 4 is formed by the series connection of the normally closed contacts of the main contactor KM1 and the normally closed contacts of the contactor KM2 of the diesel generator. When there is a power failure in the commercial power supply system or at least one phase is missing, the self-starting circuit 4 can automatically control the normal start of the diesel generator.

[0026] The mains power abnormal indication circuit 5 includes the second control switch QF4, the normally closed contacts of the first intermediate relay KA1, the normally closed contacts of the second intermediate relay KA2, the normally closed contacts of the third intermediate relay KA3, the normally closed contact of the main contactor KM1, the mains power abnormal indicator light HL2 and the mains power abnormal electric bell HL3; the voltage of the mains power abnormal indication circuit 5 is 24V, taken from the battery power supply of the diesel generator. The second control switch QF4, the normally closed contacts of the first intermediate relay KA1, the normally closed contacts of the second intermediate relay KA2, the normally closed contacts of the third intermediate relay KA3, the normally closed contact of the main contactor KM1, and the mains power abnormal indicator light HL2 are connected in series on the power supply line of the mains power abnormal indication circuit 5; the mains power abnormal electric bell HL3 is connected in parallel across the two ends of the mains power abnormal indicator light HL2. When the mains power supply system is abnormal, the mains power abnormal indicator light HL2 lights up and the mains power abnormal electric bell HL3 keeps alarming.

[0027] Working principle: When the mains power supply system is normal, the coils of the first intermediate relay KA1, the second intermediate relay KA2, and the third intermediate relay KA3 are all energized, and the normally open contacts of the first intermediate relay KA1, the second intermediate relay KA2, and the third intermediate relay KA3 are all closed;

[0028] First, close the first control switch QF3. After the mains power normal indicator light HL1 lights up, then close the first circuit breaker QF1, the second circuit breaker QF2, and the second control switch QF4 in the mains power abnormal indication circuit 5; then, press the first start button SB1, the coil of the main contactor KM1 is energized and attracted, and drives the normally open contact of the main contactor KM1 to close, forming self-locking; at the same time, the normally open contact of the main contactor KM1 in the mains power supply main circuit 1 closes, and the mains power supply main circuit 1 is connected to supply power to the electrical equipment 6 of the screening and crushing system; while the normally closed contact of the main contactor KM1 in the diesel generator power supply main circuit 3 is disconnected, and the self-starting line 4 is not connected;

[0029] Since the coils of the first intermediate relay KA1, the second intermediate relay KA2, and the third intermediate relay KA3 are all energized, the normally closed contacts of the first intermediate relay KA1, the second intermediate relay KA2, and the third intermediate relay KA3 are all disconnected, the mains power abnormal indicator light HL2 does not light up, and the mains power abnormal electric bell HL3 does not ring.

[0030] When the mains power supply system loses power or at least one phase is open, at least one of the coils of the first intermediate relay KA1, the second intermediate relay KA2, and the third intermediate relay KA3 loses power, and at least one of the normally open contacts of the first intermediate relay KA1, the second intermediate relay KA2, and the third intermediate relay KA3 that are already closed opens. The mains normal indicator light HL1 goes out. At the same time, at least one of the normally closed contacts of the first intermediate relay KA1, the second intermediate relay KA2, and the third intermediate relay KA3 that are already open closes; and the coil of the main contactor KM1 loses power, and the normally closed contact of the main contactor KM1 that is already open in the mains abnormal indication circuit 5 closes, the mains abnormal indication circuit 5 is connected, the mains abnormal indicator light HL2 lights up, and the mains abnormal electric bell HL3 keeps alarming; at the same time, the normally closed contact of the main contactor KM1 that is already open in the diesel generator power supply main circuit 3 closes, the self-starting circuit 4 is connected, the diesel generator starts, the coil of the contactor KM2 of the diesel generator gets powered. Although the normally closed contact of the contactor KM2 of the diesel generator in the self-starting circuit 4 is disconnected to avoid short circuit, however, the diesel generator runs normally, and the normally open contact of the contactor KM2 of the diesel generator closes, and the diesel generator power supply main circuit 3 is connected to supply power to the electrical equipment 6 of the screening and crushing system;

[0031] After the mains abnormal electric bell HL3 keeps alarming and the power supply company processes the open-phase fault, the mains power supply system returns to normal, the coils of the first intermediate relay KA1, the second intermediate relay KA2, and the third intermediate relay KA3 all get powered, the normally open contacts of the first intermediate relay KA1, the second intermediate relay KA2, and the third intermediate relay KA3 in the mains control circuit 2 all close, and the mains normal indicator light HL1 lights up; at the same time, the normally closed contacts of the first intermediate relay KA1, the second intermediate relay KA2, and the third intermediate relay KA3 in the mains abnormal indication circuit 5 all open, the mains abnormal indicator light HL2 does not light up, and the mains abnormal electric bell HL3 does not ring;

[0032] Disconnect the second circuit breaker QF2 to stop the operation of the diesel generator. The coil of the contactor KM2 of the diesel generator loses power, and the normally closed contacts of the contactor KM2 of the diesel generator that are already open in the mains control circuit 2 and the self-starting circuit 4 close. Press the first start button SB1 to repeat the above process, and the power supply of the diesel generator is switched to the normal mains power supply, and then the second circuit breaker QF2 is closed again.

[0033] The above is only the preferred embodiment of the present invention and is not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A control circuit for a screening and crushing system with both oil and electricity functions, characterized in that, It includes a main circuit powered by the commercial power supply, a first intermediate relay KA1, a second intermediate relay KA2, a third intermediate relay KA3, a commercial power control circuit, a main circuit powered by a diesel generator, a self-starting circuit, and a commercial power abnormal indication circuit; The main circuit powered by the commercial power supply supplies power to the electrical equipment of the screening and crushing system. The coils of the first intermediate relay KA1, the second intermediate relay KA2, and the third intermediate relay KA3 are respectively connected to the power line of the main circuit powered by the commercial power supply; On the power line of the commercial power control circuit, a first control switch QF3, a normally open contact of the first intermediate relay KA1, a normally open contact of the second intermediate relay KA2, a normally open contact of the third intermediate relay KA3, a stop button SB3, a normally closed contact of the contactor KM2 of the diesel generator, a first start button SB1, and a main contactor KM1 coil are sequentially connected in series; A normally open contact of the main contactor KM1 is connected in parallel at both ends of the first start button SB1; A commercial power normal indicator light HL1 is connected in parallel at both ends of the series circuit formed by the stop button SB3, the normally closed contact of the contactor KM2 of the diesel generator, the first start button SB1, and the main contactor KM1 coil, constituting the commercial power control circuit; The main circuit powered by the diesel generator supplies power to the electrical equipment of the screening and crushing system. The self-starting circuit is connected in parallel at both ends of the second start button SB2 of the diesel generator. The self-starting circuit is formed by the series connection of a normally closed contact of the main contactor KM1 and a normally closed contact of the contactor KM2 of the diesel generator; The commercial power abnormal indication circuit includes a second control switch QF4, a normally closed contact of the first intermediate relay KA1, a normally closed contact of the second intermediate relay KA2, a normally closed contact of the third intermediate relay KA3, a normally closed contact of the main contactor KM1, and a commercial power abnormal indicator light HL2, which are sequentially connected in series on the diesel generator power supply.

2. The control circuit of a screening and crushing system with both oil and electricity usage according to claim 1, wherein The main circuit powered by the commercial power supply includes a first circuit breaker QF1, a normally open contact of the main contactor KM1, and the electrical equipment of the screening and crushing system; The three-phase power lines L1, L2, and L3 are sequentially connected in series to the first circuit breaker QF1 and the normally open contact of the main contactor KM1, and then connected to the electrical equipment of the screening and crushing system, constituting the main circuit powered by the commercial power supply.

3. The control circuit of a screening and crushing system with both oil and electricity use according to claim 1, characterized in that, The main circuit powered by the diesel generator includes a diesel generator, a second circuit breaker QF2, a normally open contact of the contactor KM2 of the diesel generator, and the electrical equipment of the screening and crushing system; The second circuit breaker QF2 and the normally open contact of the contactor KM2 of the diesel generator are connected in series to the power line of the diesel generator, and then connected to the electrical equipment of the screening and crushing system, constituting the main circuit powered by the diesel generator.

4. A control circuit for an oil-electric dual-use screening and crushing system according to any one of claims 1-3, characterized in that, The commercial power abnormal indication circuit further includes a commercial power abnormal electric bell HL3, and the commercial power abnormal electric bell HL3 is connected in parallel at both ends of the commercial power abnormal indicator light HL2.

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