Rapid closing device

Abstract

A rapid closing device comprises a power supply unit and a control unit. The control unit comprises a signal input module, a PLC module and a signal response module. The signal input module is used for receiving opening and closing signals; the signal input module is connected with the PLC module, and the PLC module is used for outputting a control signal according to the opening and closing signal; the signal response module is connected with the PLC module and a main loop of the direct-current trolley, and the signal response module is used for responding to the control signal to enable the main loop of the direct-current trolley to be switched on; the power supply unit is connected with the signal input module, the PLC module and the signal response module, and the power supply unit is used for providing a working power supply. According to the utility model, through automatic control of the PLC module, the rapid switching-on device can rapidly output a control signal according to a switching-on and switching-off signal received by the signal input module, so that the signal response module rapidly executes switching-on operation. According to the invention, closing by manually pressing a relay in the prior art can be avoided, potential safety hazards are reduced, delay of manual operation is reduced, and the power supply recovery speed is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of rapid closing of urban rail transit power supply systems, in particular to a rapid closing device. Background Art

[0002] The urban rail transit power supply system is a system that provides the required electric energy for subway operation. It not only provides traction power for subway trains, but also provides electric energy for equipment operation, station lighting, disaster prevention alarm, etc. The urban rail transit power supply system is one of the important components to ensure the normal operation of the subway. Therefore, in order to ensure safe and reliable power supply for the subway, it is necessary to improve the quality level of substation equipment.

[0003] The Guangzhou Metro line network traction power supply system adopts DC1500V power supply. When a secondary component failure occurs in the DC trolley, the DC switch cabinet cannot close the DC trolley, which will affect the DC1500V contact network power supply and cause the train to be unable to run, especially the terminal traction and mixing station and the vehicle depot traction and mixing station, which can easily cause train delays and the fault has a wide impact range.

[0004] The closing device currently in use is a closing plate combined with relays. This plate can only respond to protection faults but not secondary component faults. In addition, the complex wiring of this plate increases the time required to restore power. This plate requires the user to directly press the relay to perform the closing operation, so there are safety hazards during operation. Utility Model Content

[0005] In order to overcome the above technical defects, the utility model provides a fast closing device, which can solve the secondary component failure while reducing the time for power restoration and the safety hazards during operation.

[0006] In order to solve the above problems, the utility model is implemented according to the following technical solutions:

[0007] A fast closing device, applied to a DC1500V DC trolley, comprises: a power supply unit and a control unit;

[0008] The control unit includes a signal input module, a PLC module and a signal response module;

[0009] The signal input module is used to receive opening and closing signals;

[0010] The signal input module is connected to the PLC module, and the PLC module is used to output a control signal according to the opening and closing signal;

[0011] The signal response module is connected to the PLC module and the main circuit of the DC trolley, and the signal response module is used to respond to the control signal to close the main circuit of the DC trolley;

[0012] The power supply unit is connected to the signal input module, the PLC module, and the signal response module, and the power supply unit is used to provide working power.

[0013] Compared with the prior art, the utility model provides a fast closing device with the following beneficial effects: through the automatic control of the PLC module, the fast closing device can quickly output a control signal according to the opening and closing signal received by the signal input module, so that the signal response module can quickly perform the closing operation. It can avoid the traditional manual pressing of the relay to close the switch, reduce safety hazards, and reduce the delay of manual operation, thereby improving the speed of power supply recovery.

[0014] Optionally, it also includes an indication unit;

[0015] The indicating unit is connected to the signal circuit of the DC trolley and is used to indicate the opening and closing state of the main circuit of the DC trolley;

[0016] The power supply unit is connected to the indicating unit to provide working power.

[0017] Optionally, a heat dissipation unit is also included;

[0018] The heat dissipation unit is used to dissipate heat from the rapid closing device;

[0019] The power supply unit is connected to the heat dissipation unit to provide working power.

[0020] Optionally, the power supply unit includes: a transformer, a 110V power supply unit and a 24V power supply unit;

[0021] The 110V power supply unit is connected to the 24V power supply unit via the transformer;

[0022] The 110V power supply unit is connected to the signal input module, the PLC module, the signal response module, and the indication unit;

[0023] The 24V power supply unit is connected to the PLC module, the signal response module, and the heat dissipation unit.

[0024] Optionally, the signal input module includes: an opening button and a closing button;

[0025] The first end and the second end of the 110V power supply unit are connected through the PLC module;

[0026] The first end of the 110V power supply unit is connected to the PLC module via the opening button;

[0027] The first end of the 110V power supply unit is connected to the PLC module via the closing button.

[0028] Optionally, the signal response module includes: a first relay, a second relay and a holding resistor;

[0029] The first end and the second end of the 110V power supply unit are connected in sequence through the normally open contact of the first relay and the main circuit of the DC trolley;

[0030] The first end and the second end of the 110V power supply unit are connected in sequence through the holding resistor, the normally open contact of the second relay and the main circuit of the DC trolley;

[0031] The first end of the 24V power supply unit is connected to the PLC module;

[0032] The PLC module is connected to the second end of the 24V power supply unit through the coil of the first relay;

[0033] The PLC module is connected to the second end of the 24V power supply unit through the coil of the second relay.

[0034] Optionally, the indicating unit includes: an opening indicator light and a closing indicator light;

[0035] The first end and the second end of the 110V power supply unit are connected in sequence through the signal circuit of the DC trolley and the opening indicator light;

[0036] The first end and the second end of the 110V power supply unit are connected in sequence through the signal circuit of the DC trolley and the closing indicator light.

[0037] Optionally, the heat dissipation unit includes: a first fan and a second fan;

[0038] The first end and the second end of the 24V power supply unit are connected through the first fan;

[0039] The first end and the second end of the 24V power supply unit are connected through the second fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a circuit schematic diagram of the utility model.

[0041] Explanation of the accompanying drawings: 1. Power supply unit; 101. Transformer; 102. 110V power supply unit; 103. 24V power supply unit; 2. Control unit; 201. Signal input module; 202. PLC module; 203. Signal response module; 3. Indication unit; 4. Heat dissipation unit; 5. DC trolley. DETAILED DESCRIPTION

[0042] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0043] When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims. In the description of the present application, it should be understood that the terms "first", "second", "third", etc. are only used to distinguish similar objects, and do not have to be used to describe a specific order or sequence, nor can they be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0044] See also Figure 1 As shown, a fast closing device includes a power supply unit 1, a control unit 2, an indication unit 3 and a heat dissipation unit 4. The power supply unit 1 is connected to the control unit 2, the indication unit 3 and the heat dissipation unit 4 respectively, and the power supply unit 1 is used to provide working power to the control unit 2, the indication unit 3 and the heat dissipation unit 4.

[0045] The power supply unit 1 includes a transformer 101, a 110V power supply unit 102 and a 24V power supply unit 103. The 110V power supply unit 102 is connected to the 24V power supply unit 103 via the transformer 101, and the transformer 101 is used to convert a DC 110V voltage into a DC 24V voltage.

[0046] The control unit 2 includes a signal input module 201, a PLC module 202 and a signal response module 203. The signal input module 201 is used to receive the opening and closing signals; the signal input module 201 is connected to the PLC module 202, and the PLC module 202 is used to output the control signal according to the opening and closing signals; the signal response module 203 is connected to the PLC module 202, and the signal response module 203 is connected to the main circuit of the DC trolley 5, and the signal response module 203 is used to respond to the control signal output by the PLC module 202, so as to close the main circuit of the DC trolley 5 and restore the power supply of the DC trolley 5.

[0047] Through the automatic control of the PLC module 202, the fast closing device can quickly output a control signal according to the opening and closing signal received by the signal input module 201, so that the signal response module 203 can quickly perform the closing operation. This can avoid the traditional manual pressing of the relay to close the circuit, reduce safety hazards, and reduce the delay of human operation, thereby increasing the speed of power supply recovery.

[0048] The signal input module 201 includes an opening button SB1 and a closing button SB2. The positive and negative ends of the 110V power supply unit 1 are connected through the PLC module 202; the positive end of the 110V power supply unit 102 is connected to the PLC module 202 through the opening button SB1; the positive end of the 110V power supply unit 102 is connected to the PLC module 202 through the closing button SB2.

[0049] The signal response module 203 includes a first relay K10, a second relay K11 and a holding resistor R10. The positive and negative ends of the 110V power supply unit 102 are connected in sequence through the normally open contact of the first relay K10 and the main circuit of the DC trolley 5; the positive and negative ends of the 110V power supply unit 102 are connected in sequence through the holding resistor R10, the normally open contact of the second relay K11 and the main circuit of the DC trolley 5; the positive end of the 24V power supply unit 103 is connected to the PLC module 202; the PLC module 202 is connected to the negative end of the 24V power supply unit 103 through the coil of the first relay K10; the PLC module 202 is connected to the negative end of the 24V power supply unit 103 through the coil of the second relay K11.

[0050] The indicating unit 3 includes an opening indicator light LP1 and a closing indicator light LP2. The opening indicator light LP1 is used to indicate that the main circuit of the DC trolley 5 is in an open state, i.e., an opening state; the closing indicator light LP2 is used to indicate that the main circuit of the DC trolley 5 is in a closed state, i.e., a closing state. The positive and negative ends of the 110V power supply unit 102 are connected in sequence through the opening signal circuit of the DC trolley 5 and the opening indicator light LP1; the positive and negative ends of the 110V power supply unit 102 are connected in sequence through the closing signal circuit of the DC trolley 5 and the closing indicator light LP2.

[0051] The heat dissipation unit 4 includes a first fan and a second fan. The heat dissipation unit 4 is used to dissipate heat for the fast closing device. The positive and negative ends of the 24V power supply unit 103 are connected through the first fan; the positive and negative ends of the 24V power supply unit 103 are connected through the second fan.

[0052] The DC trolley 5 is powered by DC1500V. Therefore, when a secondary component failure occurs in the DC trolley 5, such as a relay failure, a protection device failure, a control module failure, or a holding resistor failure, the DC switch cabinet cannot close the DC trolley 5, that is, the power supply of the DC trolley 5 cannot be restored.

[0053] By means of the rapid closing device, when a secondary component failure occurs in the DC trolley 5, the staff can connect the rapid closing device to the DC trolley 5 of the switch cabinet, and then send a closing signal through the closing button SB2 of the signal input module 201, so that the PLC module 202 outputs a corresponding control signal according to the closing signal, and then the signal response module 203 performs corresponding operations on the first relay K10 and the second relay K11 according to the control signal, so as to close the main circuit of the DC trolley 5.

[0054] Therefore, when a secondary component failure occurs in the DC trolley 5, the main circuit of the DC trolley 5 can be closed by the rapid closing device to restore power supply, thereby solving the problem that the DC trolley switch cabinet cannot be closed.

[0055] The DC trolley 5 is referred to the prior art, and the present invention will not describe it in detail.

[0056] Next, the circuit principle of the fast closing device is further explained in combination with the specific implementation process, as follows:

[0057] Closing process:

[0058] When the closing button SB2 is pressed, the I2 terminal of the PLC module 202 receives the closing signal, and the PLC module 202 outputs signals through the Q1.2 terminal and the Q2.2 terminal, so that the coil of the first relay K10 and the coil of the second relay K11 can be energized within 30ms. When the coil of the first relay K10 and the coil of the second relay K11 are energized, the normally open contact of the first relay K10 and the normally open contact of the second relay K11 are closed. At this time, the branch where the normally open contact of the first relay K10 is located will short-circuit and shield the branch where the resistor R10 and the normally open contact of the second relay K11 are connected in series, that is, the voltage output from the positive end of the 110V power supply unit 102 flows to the main circuit of the DC trolley 5 through the normally open contact of the first relay K10, and then flows to the negative end of the 110V power supply unit 102 to form a loop, which can make the DC trolley 5 The main circuit is closed to quickly restore the power supply of the DC trolley 5; to prevent the current flowing through the cable from being too large when the normally open contact of the first relay K10 is closed, causing continuous heating and affecting the stability of the switch, the PLC module 202 outputs no signal through the Q1.2 terminal at 5000ms, causing the coil of the first relay K10 to lose power. At this time, the normally open contact of the first relay K10 is opened, and the normally open contact of the second relay K11 is connected in series with the holding resistor R10. At this time, the voltage output from the positive end of the 110V power supply unit 102 flows to the main circuit of the DC trolley 5 through the holding resistor R10 and the normally open contact of the second relay K11, and then flows to the negative end of the 110V power supply unit 102 to form a loop, so that when the normally open contact of the first relay K10 is opened, the main circuit of the DC trolley 5 can continue to close, thereby realizing continuous power supply to the DC trolley 5. When the main circuit of the DC trolley 5 is closed, the closing indicator light LP2 is on.

[0059] In the initial stage of closing the circuit, it is necessary to close the normally open contact of the first relay K10 to short-circuit the branch where the shielding holding resistor R10 and the normally open contact of the second relay K11 are connected in series. This can reduce the loop resistance to increase the current flowing through the cable. In the case of high current, the DC trolley 5 can be quickly powered, that is, fast closing can be achieved, thereby increasing the speed of restoring power supply to the DC trolley 5.

[0060] In the initial stage of closing the circuit, after the power supply to the DC trolley 5 is restored, the normally open contact of the first relay K10 needs to be opened so that the output voltage of the power supply unit 1 can flow through the branch where the resistor R10 and the normally open contact of the second relay K11 are connected in series, thereby increasing the loop resistance.

[0061] The loop formed when the normally open contact of the first relay K10 is closed is compared with the loop formed when the normally open contact of the first relay K10 is opened. The loop resistance when the normally open contact of the first relay K10 is closed is smaller than the loop resistance when the normally open contact of the first relay K10 is opened. Under the same output signal, the smaller the loop resistance, the greater the current flowing through the cable, and the greater the loop heat generation. Therefore, when the normally open contact of the first relay K10 is opened, by keeping the resistor R10 in series with the normally open contact of the second relay K11, the loop resistance can be increased to reduce the current flowing through the cable, thereby reducing the loop heat generation.

[0062] Opening process:

[0063] In the closed state, when the opening button SB1 is pressed, the I1 terminal of the PLC module 202 receives the opening signal, and the PLC module 202 outputs no signal through Q2.2, so that the coil of the second relay K11 loses power. At this time, the normally open contact of the second relay K11 opens, and the main circuit of the DC trolley 5 can be disconnected, that is, the main circuit of the DC trolley 5 is opened, and the power supply to the DC trolley 5 is stopped. When the main circuit of the DC trolley 5 is opened, the opening indicator light LP1 is on.

[0064] When a secondary component failure occurs in the DC trolley 5, the staff uses the rapid closing device to perform opening and closing operations on the main circuit of the DC trolley 5 through the opening button SB1 and the closing button SB2, thereby reducing the safety hazards of the closing operation. At the same time, it also meets the emergency requirement of "first open and then restore" when a failure occurs in the DC trolley 5, that is, first quickly restore the power supply of the DC trolley 5 to enable normal operation, and then repair the fault problem of the DC trolley 5.

[0065] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A fast closing device, applied to DC1500V DC trolley, characterized in that: include: Power supply unit and control unit; The control unit includes a signal input module, a PLC module and a signal response module; The signal input module is used to receive opening and closing signals; The signal input module is connected to the PLC module, and the PLC module is used to output a control signal according to the opening and closing signal; The signal response module is connected to the PLC module and the main circuit of the DC trolley, and the signal response module is used to respond to the control signal to close the main circuit of the DC trolley; The power supply unit is connected to the signal input module, the PLC module, and the signal response module, and the power supply unit is used to provide working power.

2. A fast closing device according to claim 1, characterized in that: Also includes an indication unit; The indicating unit is connected to the signal circuit of the DC trolley and is used to indicate the opening and closing state of the main circuit of the DC trolley; The power supply unit is connected to the indicating unit to provide working power.

3. A fast closing device according to claim 2, characterized in that: Also includes a heat dissipation unit; The heat dissipation unit is used to dissipate heat for the rapid closing device; The power supply unit is connected to the heat dissipation unit to provide working power.

4. A fast closing device according to claim 3, characterized in that: The power supply unit includes: a transformer, a 110V power supply unit and a 24V power supply unit; The 110V power supply unit is connected to the 24V power supply unit via the transformer; The 110V power supply unit is connected to the signal input module, the PLC module, the signal response module, and the indication unit; The 24V power supply unit is connected to the PLC module, the signal response module, and the heat dissipation unit.

5. A fast closing device according to claim 4, characterized in that: The signal input module includes: an opening button and a closing button; The first end and the second end of the 110V power supply unit are connected through the PLC module; The first end of the 110V power supply unit is connected to the PLC module via the opening button; The first end of the 110V power supply unit is connected to the PLC module via the closing button.

6. A fast closing device according to claim 4, characterized in that: The signal response module includes: a first relay, a second relay and a holding resistor; The first end and the second end of the 110V power supply unit are connected in sequence through the normally open contact of the first relay and the main circuit of the DC trolley; The first end and the second end of the 110V power supply unit are connected in sequence through the holding resistor, the normally open contact of the second relay and the main circuit of the DC trolley; The first end of the 24V power supply unit is connected to the PLC module; The PLC module is connected to the second end of the 24V power supply unit through the coil of the first relay; The PLC module is connected to the second end of the 24V power supply unit through the coil of the second relay.

7. A fast closing device according to claim 4, characterized in that: The indicating unit comprises: an opening indicating light and a closing indicating light; The first end and the second end of the 110V power supply unit are connected in sequence through the signal circuit of the DC trolley and the opening indicator light; The first end and the second end of the 110V power supply unit are connected in sequence through the signal circuit of the DC trolley and the closing indicator light.

8. A fast closing device according to claim 4, characterized in that: The heat dissipation unit comprises: a first fan and a second fan; The first end and the second end of the 24V power supply unit are connected through the first fan; The first end and the second end of the 24V power supply unit are connected through the second fan.

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