Random cable intelligent anti-pull-out circuit

Abstract

The utility model belongs to the technical field of coal mine electrical safety, and particularly relates to a random cable intelligent anti-pull-out circuit, which comprises a control circuit, a first travel switch and a second travel switch, the first travel switch and the second travel switch are arranged in the electric control box and are respectively positioned on one side of the random cable; the first travel switch is located at a position 4-8mm away from an opening of the electric cabinet, and the second travel switch is arranged at the tail end of the cable; the control circuit comprises a first alarm, a feeder switch circuit breaker CJ, a first transformer T1, a rectifier bridge circuit, a voltage stabilizing circuit, an oscillating circuit, a signal amplification circuit, an intermediate relay J1 and a second alarm; a first travel switch contact is connected to an electrical equipment start-stop loop; and the second travel switch is combined with an oscillation circuit to control feed tripping. According to the utility model, the power supply safety of underground coal mine equipment is improved, and electrical accidents are avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of coal mine electrical safety, and in particular relates to an intelligent anti-pulling circuit for random cables. Background Art

[0002] In underground coal mines, tunnel boring machines or coal mining machines are generally powered by superior power supply switches, and the power supply cables are connected to their electrical control parts. When tunnel boring machines and coal mining machines move, the random cables also move together. If the cables are blocked during the movement, it is easy to pull out the cables. The cables are most likely to be pulled out at the electrical control bell mouth, causing electrical accidents. To avoid such accidents, it is necessary to design a circuit. When the cable is about to be pulled out by external force, the power will be cut off according to the pull-out situation to warn and avoid electrical accidents. Utility Model Content

[0003] The utility model overcomes the deficiencies of the prior art and aims to solve the technical problem of providing an intelligent anti-unplugging circuit for a random cable to achieve safe monitoring of the random cable.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a random cable intelligent anti-unplugging circuit, including a control circuit and a first travel switch and a second travel switch arranged in an electric control box;

[0005] The first travel switch and the second travel switch are arranged in the electric control box and are respectively located on one side of the random cable; the first travel switch is located 4 to 6 mm away from the opening of the electric control box, and the second travel switch is arranged at the end of the cable;

[0006] The control circuit includes a first alarm, a feed switch breaker CJ, a first transformer T1, a rectifier bridge circuit, a voltage stabilizing circuit, an oscillation circuit, a signal amplifying circuit, an intermediate relay J1 and a second alarm;

[0007] The normally open node K1-1 of the first travel switch is connected in series with the first alarm H1 and then connected to both ends of the power supply, and the normally closed node K1-2 is connected in series with the closing coil J2 of the electric control box;

[0008] The three-phase power supply is connected to the primary side of the first transformer T1, the secondary side of the first transformer T1 is connected to the AC input end of the rectifier bridge circuit, the DC output end of the rectifier bridge circuit is connected to the input end of the voltage stabilizing circuit, the output end of the voltage stabilizing circuit is connected to the power input end of the oscillation circuit and the signal amplification circuit; the signal output end of the oscillation circuit is connected to the signal input end of the signal amplification circuit, and the signal output end of the signal amplification circuit is connected to the coil of the intermediate relay J1; the normally closed contact J1-1 of the intermediate relay J1 is connected in series with the second alarm H2 and then connected to both ends of the power supply, and the normally open contact J1-2 is connected in series with the feeder disconnecting circuit;

[0009] The input end of the switch circuit breaker CJ is connected to a three-phase power supply, and the output end is connected to the secondary coil of the oscillator of the oscillation circuit. The node K2-1 of the second travel switch is connected in series with the electrolytic capacitor C15 and then connected to the output end of the switch circuit breaker CJ in two phases.

[0010] The contacts of the first travel switch and the second travel switch are in contact with the cable sheath.

[0011] The first travel switch is located 5 mm away from the opening of the electric control box.

[0012] The control circuit also includes a filter circuit, which is arranged between the DC output end of the rectifier bridge circuit and the input end of the voltage stabilizing circuit.

[0013] The electrolytic capacitor C15 is a high-frequency capacitor, and its parameters are 2 μF, 1 kV.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] The utility model provides a random cable intelligent anti-pulling circuit. According to the characteristics that the cable is most likely to be pulled out at its electrical control bell mouth and the cable needs to penetrate 5-15mm into the wall of the electrical equipment, two travel switches are arranged on the inner wall of the electrical equipment, which are respectively located on both sides of the cable. At the same time, the output signals of the two travel switches are respectively connected to the start-stop circuit and the oscillation circuit of the electrical equipment, so that the circuit can automatically respond when the cable is pulled out, and no additional cable needs to be laid when the upper switch is locked. The working principle of the oscillation circuit is utilized to stop the upper switch power supply when the cable is pulled out beyond the allowable value, thereby improving the power supply safety of the equipment in the coal mine and avoiding the occurrence of electrical accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the installation of a travel switch in a random cable intelligent anti-unplugging circuit provided by an embodiment of the utility model;

[0017] Figure 2 A circuit principle block diagram of a random cable intelligent anti-unplugging circuit provided by the utility model;

[0018] Figure 3 The circuit principle control diagram provided by the utility model;

[0019] Figure 4 for Figure 2 Specific circuit schematic diagram.

[0020] In the figure: 2 is an electric control box, 3 is a first travel switch, 4 is a second travel switch, 5 is a bell mouth, 6 is a cable sheath, and 7 is a cable core. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all of the embodiments; based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0022] like Figures 1 to 3 As shown, an embodiment of the utility model provides a random cable intelligent anti-unplugging circuit, including a control circuit and a first travel switch 3 and a second travel switch 4 arranged in an electric control box.

[0023] like Figure 1 As shown, the first travel switch 3 and the second travel switch 4 are arranged in the electric control box 2 and are respectively located on one side of the random cable; the first travel switch is located 4 to 6 mm away from the opening of the electric control box, and the second travel switch is arranged at the end of the random cable.

[0024] like Figures 2-3 As shown, in this embodiment, the control circuit includes a first alarm H1, a feeder switch breaker CJ, a first transformer T1, a rectifier bridge circuit 101, a voltage stabilizing circuit 103, an oscillation circuit 104, a signal amplifying circuit 105, an intermediate relay J1 and a second alarm H2.

[0025] The normally open node K1-1 of the first travel switch is connected in series with the first alarm H1 and then connected to both ends of the power supply, and the normally closed node K1-2 is connected in series with the closing coil J2 of the electric control box; the three-phase power supply is connected to the primary side of the first transformer T1, the secondary side of the first transformer T1 is connected to the AC input end of the rectifier bridge circuit, the DC output end of the rectifier bridge circuit is connected to the input end of the voltage stabilizing circuit, and the output end of the voltage stabilizing circuit is connected to the power input end of the oscillation circuit and the signal amplification circuit; the signal output end of the oscillation circuit is connected to the signal The signal input end of the amplifier circuit is connected, and the signal output end of the signal amplifier circuit is connected to the coil of the intermediate relay J1; the normally closed contact J1-1 of the intermediate relay J1 is connected in series with the second alarm H2 and then connected to both ends of the power supply, and the normally open contact J1-2 is connected in series with the feeder disconnecting circuit; the input end of the switch circuit breaker CJ is connected to the three-phase power supply, and the output end is connected to the secondary coil of the oscillator of the oscillation circuit, and the node K2-1 of the second travel switch is connected in series with the electrolytic capacitor C15 and then connected to the two-phase output end of the switch circuit breaker CJ.

[0026] Specifically, in this embodiment, the contacts of the first travel switch and the second travel switch are in contact with the cable sheath 6 of the random cable. The cable core of the random cable is connected to the terminal in the electric control box.

[0027] Specifically, in this embodiment, the first travel switch is located 5 mm away from the opening of the electric control box.

[0028] Furthermore, if Figure 2 As shown, in this embodiment, the control circuit further includes a filter circuit 102, and the filter circuit is arranged between the DC output end of the rectifier bridge circuit and the input end of the voltage stabilizing circuit.

[0029] The electrolytic capacitor C15 is a high-frequency capacitor, and its parameters are 2 μF, 1 kV.

[0030] Furthermore, if Figure 4 As shown, in this embodiment, the voltage stabilizing circuit includes an integrated voltage stabilizer of model W7815 and a capacitor C4 connected in parallel to the output end of the integrated voltage stabilizer. In the oscillation circuit 104, the positive electrode of the output voltage of the voltage stabilizing circuit is connected to the negative electrode of the output voltage of the voltage stabilizing circuit after passing through the resistor R1, the capacitor C5 and the primary coil L1 of the oscillator. The negative electrode of the output voltage of the voltage stabilizing circuit is grounded. The positive electrode of the output voltage of the voltage stabilizing circuit is connected to the O point of the primary coil of the oscillator after passing through the resistor R2 and the sliding rheostat R3. The O point of the primary coil L1 of the oscillator is connected to the signal input end of the signal amplifying circuit through the capacitor C4. In addition, the capacitor C6 is connected in parallel to the two ends of the primary coil L1 of the oscillator. After the power output end of the electric control box 1 of the tunneling machine passes through the electric control box isolation switch HK, any two phases of the three phases are also connected to the two ends of the oscillator load coil L2 respectively after passing through the resistor R4 and the capacitor C7, and the resistor R5 and the capacitor C8, and the other phase of the three phases is connected to the O' point of the oscillator load coil L2.

[0031] Furthermore, if Figure 4 As shown, in this embodiment, the signal amplification circuit includes a first operational amplifier V1, a second operational amplifier V2 and a third operational amplifier V3, the positive electrode of the output voltage of the voltage stabilizing circuit is connected in series with the resistor R3 and the resistor R4 and then connected to the negative electrode of the output voltage of the voltage stabilizing circuit, the two ends of the resistor R4 are connected in parallel with the electrolytic capacitor C2, the first input end of the first operational amplifier V1 is connected between the resistor R3 and the resistor R4, the second input end of the first operational amplifier V1 is connected to the point O of the primary coil L1 through the capacitor C9, the second input end of the first operational amplifier V1 is also grounded through the resistor R5, the output end of the first operational amplifier V1 is connected to the second input end of the second operational amplifier through the resistor R9, the output end of the first operational amplifier V1 is connected in series with the resistor R6 and then connected to the positive electrode of the output voltage of the voltage stabilizing circuit, the output end of the first operational amplifier V1 is connected in series with the capacitor C14 and then connected to the negative electrode of the output voltage of the voltage stabilizing circuit;

[0032] The positive electrode of the output voltage of the voltage stabilizing circuit is connected in series with the resistor R7 and the resistor R8, and then connected to the negative electrode of the output voltage of the voltage stabilizing circuit. The first input end of the second operational amplifier V2 is connected between the resistor R7 and the resistor R8. The second input end of the second operational amplifier V2 is connected to the output end of the first operational amplifier via the resistor R9. The second input end of the second operational amplifier V2 is also connected in series with the electrolytic capacitor C3 and then connected to the negative electrode of the output voltage of the voltage stabilizing circuit. The output end of the second operational amplifier V2 is connected to the positive electrode of the diode D6, and is connected to the first input end of the third operational amplifier V3 through the diode D6; the output end of the second operational amplifier V2 is also connected to the positive electrode of the diode D5, and is connected to the second input end of the second operational amplifier V2 through the diode D5.

[0033] The positive electrode of the output voltage of the voltage stabilizing circuit is connected in series with the resistor R10 and the resistor R11, and then connected to the negative electrode of the output voltage of the voltage stabilizing circuit. The first input end of the third operational amplifier V3 is connected to the output end of the second operational amplifier V2 through the diode D6, the negative electrode of the diode D6 is connected in series with the resistor R12, and then connected to the positive electrode of the output voltage of the voltage stabilizing circuit 103. The negative electrode of the diode D6 is connected in series with the resistor R13, and then connected to the negative electrode of the output voltage of the voltage stabilizing circuit. The second input end of the third operational amplifier V3 is connected between the resistor R10 and the resistor R11, and the two ends of the resistor R11 are connected in parallel with the electrolytic capacitor C4; the output end of the third operational amplifier V3 is connected in series with the coil of the first intermediate relay J1, and then connected to the negative electrode of the output voltage of the voltage stabilizing circuit; the output end of the third operational amplifier V3 is also connected to the ground through the electrolytic capacitor C5 and the diode D4 connected in parallel. The first operational amplifier V1 is an integrated module of model LM339, and the second operational amplifier V2 and the third operational amplifier V3 are integrated modules of model LM224.

[0034] The working principle of the utility model is as follows: as long as the upper switch supplies power, the oscillation circuit works, the intermediate relay J1 works, and the power feeding is allowed. When the cable is initially pulled out, the second travel switch set at the end of the cable is actuated, and its node K2-1 is closed, and the oscillation circuit is short-circuited by the electrolytic capacitor C15, and the oscillator stops working, then the coil of the intermediate relay J1 is de-energized, and its contact J1-1 turns on the second alarm H2 to alarm, and the contact J1-2 closes the feeder disconnect circuit, and the feeder trips. When the cable is pulled out to a length less than 5mm in the electric control box, the first travel switch set at the corresponding position is actuated, and its node K1-1 turns on the first alarm H1 to alarm, and the contact K1-2 turns off the power to the closing coil J2 of the electric control box and cannot be started.

[0035] The utility model provides a random cable intelligent anti-pulling circuit, which can realize automatic circuit response when the cable is pulled out, and no additional cable needs to be laid when locking the upper switch. By utilizing the working principle of the oscillation circuit, the upper switch power supply can be stopped when the cable is pulled out beyond the allowable value, thereby avoiding electrical accidents.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A random cable intelligent anti-unplugging circuit, characterized in that: It includes a control circuit and a first travel switch and a second travel switch arranged in an electric control box; The first travel switch and the second travel switch are arranged in the electric control box and are respectively located on one side of the random cable; the first travel switch is located 4 to 6 mm away from the opening of the electric control box, and the second travel switch is arranged at the end of the cable; The control circuit includes a first alarm, a feed switch breaker CJ, a first transformer T1, a rectifier bridge circuit, a voltage stabilizing circuit, an oscillation circuit, a signal amplifying circuit, an intermediate relay J1 and a second alarm; The normally open node K1-1 of the first travel switch is connected in series with the first alarm H1 and then connected to both ends of the power supply, and the normally closed node K1-2 is connected in series with the closing coil J2 of the electric control box; The three-phase power supply is connected to the primary side of the first transformer T1, the secondary side of the first transformer T1 is connected to the AC input end of the rectifier bridge circuit, the DC output end of the rectifier bridge circuit is connected to the input end of the voltage stabilizing circuit, the output end of the voltage stabilizing circuit is connected to the power input end of the oscillation circuit and the signal amplification circuit; the signal output end of the oscillation circuit is connected to the signal input end of the signal amplification circuit, and the signal output end of the signal amplification circuit is connected to the coil of the intermediate relay J1; the normally closed contact J1-1 of the intermediate relay J1 is connected in series with the second alarm H2 and then connected to both ends of the power supply, and the normally open contact J1-2 is connected in series with the feeder disconnecting circuit; The input end of the switch circuit breaker CJ is connected to a three-phase power supply, and the output end is connected to the secondary coil of the oscillator of the oscillation circuit. The node K2-1 of the second travel switch is connected in series with the electrolytic capacitor C15 and then connected to the output end of the switch circuit breaker CJ in two phases.

2. The intelligent anti-unplugging circuit for random cables according to claim 1 is characterized in that: The contacts of the first travel switch and the second travel switch are in contact with the cable sheath.

3. The intelligent anti-unplugging circuit for random cables according to claim 1 is characterized in that: The first travel switch is located 5 mm away from the opening of the electric control box.

4. The intelligent anti-unplugging circuit for random cables according to claim 1 is characterized in that: The control circuit also includes a filter circuit, which is arranged between the DC output end of the rectifier bridge circuit and the input end of the voltage stabilizing circuit.

5. The intelligent anti-unplugging circuit for random cables according to claim 1 is characterized in that: The electrolytic capacitor C15 is a high-frequency capacitor, and its parameters are 2 μF, 1 kV.

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