CN219225017U - Leakage simulation device for testing underground coal mine feed switch - Google Patents
Leakage simulation device for testing underground coal mine feed switch Download PDFInfo
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- CN219225017U CN219225017U CN202222999792.0U CN202222999792U CN219225017U CN 219225017 U CN219225017 U CN 219225017U CN 202222999792 U CN202222999792 U CN 202222999792U CN 219225017 U CN219225017 U CN 219225017U
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Abstract
The utility model relates to a leakage simulation device for testing a coal mine underground feed switch, which comprises a remote leakage simulation device and a near-end leakage simulation device, wherein the remote leakage simulation device and the near-end leakage simulation device both comprise an MCU (micro control unit), a simulation grounding unit, a switching-on unit, a reset unit and a power supply unit for supplying power to the device, the output end of the MCU is respectively and electrically connected with the control end of the simulation grounding unit, the control end of the switching-on unit and the control end of the reset unit, the input end of the simulation grounding unit is used for accessing any phase in a cable connected with the feed switch and the ground wire and controlling the on-off between any phase in the cable and the ground wire, the switching-on unit is used for being electrically connected with the switching-on input end of the feed switch and controlling the switching-on of the feed switch, and the reset unit is used for being electrically connected with the reset input end of the feed switch and controlling the resetting of the feed switch; the utility model can simulate the electric leakage of the cable near the feed switch, the electric equipment and the cable near the electric equipment.
Description
Technical Field
The utility model relates to the technical field of underground coal mine protection grounding devices, in particular to a leakage simulation device for testing an underground coal mine feed switch.
Background
Due to space environment limitation in the underground coal mine, electrical equipment and cable insulation of the underground coal mine are easy to break down or damage, and electric leakage of an underground power supply system inevitably occurs. The earth leakage protection action of the low voltage switch downhole is required to be sensitive and reliable. The earth leakage protection device needs to be tested monthly.
At present, most coal mine enterprises only do the leakage simulation test of the feed switch, and do not or rarely do the remote leakage test of the power supply line. A test resistor is bridged between any phase line and the ground, and then a feeding point is used for observing whether the upper-stage feed switch is in leakage tripping or not.
Most of the switches have the leakage test function, but the leakage test is only performed on the switch, and whether the leakage protection of a power supply system with equipment and cables acts sensitively and reliably cannot be determined. Once the electricity leakage or the electric shock phenomenon of personnel occurs at the tail end of the load side of the feed switch, electric shock and electric injury accidents can be caused.
Disclosure of Invention
The utility model provides a leakage simulation device for testing a coal mine underground feed switch, which aims to solve the technical problems that no corresponding device is used for testing the leakage protection effect of the underground feed switch in the prior art.
The technical scheme for solving the technical problems is as follows:
the electric leakage simulation device comprises a remote electric leakage simulation device and a near-end electric leakage simulation device, wherein the remote electric leakage simulation device is used for conducting electric leakage simulation on electric equipment and/or cables near the electric equipment, the cables are cables for supplying power to the electric equipment by the feed switch, the near-end electric leakage simulation device is used for conducting electric leakage simulation on the cables at the feed switch, and the remote electric leakage simulation device is electrically connected with the near-end electric leakage simulation device through the cables; the remote electric leakage simulation device and the near-end electric leakage simulation device comprise an MCU, a simulation grounding unit, a closing unit, a resetting unit and a power supply unit, wherein the input end of the power supply unit is connected with a power supply, the output end of the power supply unit is respectively connected with the power supply access end of the MCU, the power supply access end of the simulation grounding unit, the power supply access end of the closing unit and the power supply access end of the resetting unit, the output end of the MCU is respectively connected with the control end of the simulation grounding unit, the control end of the closing unit and the control end of the resetting unit, the input end of the simulation grounding unit is used for being connected with any phase and ground wire in a cable connected with the feeding switch and controlling the on-off between any phase and ground wire in the cable, the closing unit is used for being electrically connected with the closing input end of the feeding switch and controlling the closing of the feeding switch, and the resetting unit is used for being electrically connected with the resetting input end of the feeding switch and controlling the resetting of the feeding switch.
The beneficial effects of the utility model are as follows: by arranging the analog grounding unit, the analog grounding unit is used for controlling any phase and ground wire in the cable connected with the feed switch and controlling the on-off between any phase and ground wire in the cable, so as to realize analog grounding, and verify whether the feed switch cuts off the power supply of the cable under the analog grounding condition; and the feed switch can be switched on and reset after the test is finished through the MCU, the switching-on unit and the reset unit.
On the basis of the technical scheme, the utility model can be improved as follows.
Further, the power supply unit comprises a first power supply unit and a second power supply unit, wherein the input end of the first power supply unit is connected with a power supply, the output end of the first power supply unit is electrically connected with the input end of the second power supply unit, and the output end of the second power supply unit is electrically connected with the power supply access end of the MCU, the power supply access end of the analog grounding unit, the power supply access end of the closing unit and the power supply access end of the resetting unit respectively.
Further, the first power supply unit includes a voltage switching module, a transformer module, an ac/dc converter, a storage battery, and a battery management system for charging the storage battery, an input end of the voltage switching module is connected to a power supply, an output end of the voltage switching module is electrically connected to an input end of the transformer module, an output end of the transformer module is electrically connected to an input end of the ac/dc converter, an output end of the ac/dc converter is electrically connected to an input end of the battery management system, and an output end of the battery management system is electrically connected to an input end of the second power supply unit.
Further, the second power supply unit comprises a direct current transformer, the input end of the direct current transformer is electrically connected with the output end of the battery management system, and the output end of the direct current transformer is electrically connected with the power supply access end of the MCU, the power supply access end of the analog grounding unit, the power supply access end of the closing unit and the power supply access end of the resetting unit respectively.
Further, the analog grounding unit comprises a test resistor, a first relay and a second optocoupler, one end of a normally open contact of the first relay is electrically connected with one of cables connected with the feed switch, the other end of the normally open contact of the first relay is grounded, one end of a first relay coil is electrically connected with an output end of the power supply unit, the other end of the first relay coil is electrically connected with an output end collector of the second optocoupler, an output end emitter of the second optocoupler is grounded, an input end positive electrode of the second optocoupler is electrically connected with an output end of the power supply unit, and an input end negative electrode of the second optocoupler is electrically connected with an output end of the MCU.
The adoption of the further scheme has the beneficial effects that the relay is driven by the optocoupler, so that the on-off of the relay is conveniently controlled by the MCU, and the grounding and disconnection in the cable connected with the MCU control feed switch are realized.
Further, the reset unit comprises a second relay and a third optocoupler, one end of a normally open contact of the second relay is electrically connected with a reset signal end of the feed switch, the other end of the normally open contact of the second relay is electrically connected with a reset grounding end of the feed switch, one end of a second relay coil is electrically connected with an output end of the power supply unit, the other end of the second relay coil is electrically connected with an output end collector of the third optocoupler, an output end emitter of the third optocoupler is grounded, an input end positive electrode of the third optocoupler is electrically connected with an output end of the power supply unit, and an input end negative electrode of the third optocoupler is electrically connected with an output end of the MCU.
The adoption of the further scheme has the beneficial effects that the relay is driven by the optocoupler, so that the on-off of the relay is conveniently controlled by the MCU, and the reset of the feed switch is controlled by the MCU.
Further, the switching-on unit includes third relay and fourth opto-coupler, the third relay, the one end of the normally open contact of third relay with feed switch's switching-on signal end electricity is connected, the other end of the normally open contact of third relay with feed switch's switching-on ground terminal electricity is connected, the one end of third relay coil with power supply unit's output electricity is connected, the other end of third relay coil with the output collecting electrode electricity of fourth opto-coupler is connected, the output projecting pole ground of fourth opto-coupler, the input positive pole of fourth opto-coupler with power supply unit's output electricity is connected, the input negative pole of fourth opto-coupler with MCU's output electricity is connected.
The adoption of the further scheme has the beneficial effects that the relay is driven by the optocoupler, so that the on-off of the relay is conveniently controlled by the MCU, and after the feed switch trips, the MCU can control the feed switch to close.
Further, the remote leakage simulation device and the near-end leakage simulation device both further comprise a storage unit, the storage unit is an electrified erasable programmable read-only memory, and the storage unit is electrically connected with the MCU in a bidirectional two-wire synchronous serial bus.
The adoption of the further scheme has the beneficial effect that the test data can be stored by arranging the charged erasable programmable read-only memory.
Further, the remote electric leakage simulation device and the near-end electric leakage simulation device both further comprise a remote communication unit, the remote communication unit is a remote radio module, and a communication port of the remote radio module is electrically connected with the serial interface of the MCU.
The remote control device has the beneficial effects that the MCU and the peripheral remote control device can be in radio communication through the remote communication unit, and the peripheral remote control device is utilized to control the device.
Further, the remote electric leakage simulation device and the near-end electric leakage simulation device both further comprise carrier communication units, a strong electric interface of the carrier communication unit of the near-end electric leakage simulation device is electrically connected with a cable connected with the feed switch, and a weak electric interface of the carrier communication unit of the near-end electric leakage simulation device is electrically connected with a serial interface of the MCU of the near-end electric leakage simulation device; the strong electric interface of the carrier communication unit of the remote electric leakage simulation device is electrically connected with a cable, and the weak electric interface of the carrier communication unit of the remote electric leakage simulation device is electrically connected with the serial interface of the MCU of the remote electric leakage simulation device.
The adoption of the further scheme has the beneficial effects that by arranging the carrier communication unit, when the electric leakage simulation is carried out, the long-distance carrier communication can be carried out through the cable. The carrier communication unit is arranged on the device, so that the device can be arranged at a position close to the feed switch when in actual use, a remote electric leakage simulation device is arranged at a position close to the electric equipment, the remote electric leakage simulation device close to the electric equipment does not directly control the reset and closing of the feed switch, but the remote electric leakage simulation device close to the electric equipment communicates with the electric leakage simulation device close to the feed switch through the carrier communication unit, and the electric leakage simulation can be carried out by utilizing the position close to the electric equipment and the position close to the feed switch.
Drawings
FIG. 1 is a schematic block diagram of a circuit of the present utility model;
FIG. 2 is a schematic circuit diagram of a first power supply unit;
FIG. 3 is a schematic circuit diagram of a second power supply unit;
FIG. 4 is a schematic circuit diagram of a remote communication unit;
FIG. 5 is a schematic circuit diagram of a memory cell;
FIG. 6 is a schematic circuit diagram of the MCU;
FIG. 7 is a schematic circuit diagram of an analog ground unit;
FIG. 8 is a schematic circuit diagram of a reset unit;
fig. 9 is a schematic circuit diagram of the closing unit.
Detailed Description
The principles and features of the present utility model are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the utility model and are not to be construed as limiting the scope of the utility model.
As shown in fig. 1, the embodiment provides a leakage simulation device for testing a coal mine underground feed switch, which comprises a remote leakage simulation device and a near-end leakage simulation device, wherein the remote leakage simulation device is used for performing leakage simulation on electric equipment and/or cables near the electric equipment, the cables are cables for supplying power to the electric equipment by the feed switch, the near-end leakage simulation device is used for performing leakage simulation on the cables at the feed switch, and the remote leakage simulation device is electrically connected with the near-end leakage simulation device through the cables; the remote electric leakage simulation device and the near-end electric leakage simulation device comprise an MCU, a simulation grounding unit, a closing unit, a resetting unit and a power supply unit, wherein the input end of the power supply unit is connected with a power supply, the output end of the power supply unit is respectively connected with the power supply access end of the MCU, the power supply access end of the simulation grounding unit, the power supply access end of the closing unit and the power supply access end of the resetting unit, the output end of the MCU is respectively connected with the control end of the simulation grounding unit, the control end of the closing unit and the control end of the resetting unit, the input end of the simulation grounding unit is used for being connected with any phase and ground wire in a cable connected with the feeding switch and controlling the on-off between any phase and ground wire in the cable, the closing unit is used for being electrically connected with the closing input end of the feeding switch and controlling the closing of the feeding switch, and the resetting unit is used for being electrically connected with the resetting input end of the feeding switch and controlling the resetting of the feeding switch. The MCU is also connected with a control switch, the control switch is used for manually sending 3 control electric signals to the MCU, and the MCU is convenient for receiving 3 electric signals to respectively control the analog grounding unit, the closing unit and the resetting unit. The remote electric leakage simulation device and the near-end electric leakage simulation device both further comprise carrier communication units, a strong electric interface of the carrier communication unit of the near-end electric leakage simulation device is electrically connected with a cable connected with the feed switch, and a weak electric interface of the carrier communication unit of the near-end electric leakage simulation device is electrically connected with a serial interface of the MCU of the near-end electric leakage simulation device; the strong electric interface of the carrier communication unit of the remote electric leakage simulation device is electrically connected with a cable, and the weak electric interface of the carrier communication unit of the remote electric leakage simulation device is electrically connected with the serial interface of the MCU of the remote electric leakage simulation device.
Specifically, the power supply unit comprises a first power supply unit and a second power supply unit, wherein the input end of the first power supply unit is connected with a power supply, the output end of the first power supply unit is electrically connected with the input end of the second power supply unit, and the output end of the second power supply unit is electrically connected with the power supply access end of the MCU, the power supply access end of the analog grounding unit, the power supply access end of the closing unit and the power supply access end of the resetting unit respectively.
As shown in fig. 2, the first power supply unit includes a voltage switching module SWITCH, a transformer module TRANS, an AC-DC converter AC-DC, a battery BAT, and a battery management system BMS for charging the battery BAT, an input end of the voltage switching module SWITCH is connected to a power source, an output end of the voltage switching module SWITCH is electrically connected to an input end of the transformer module TRANS, an output end of the transformer module TRANS is electrically connected to an input end of the AC-DC converter AC-DC, an output end of the AC-DC converter AC-DC is electrically connected to an input end of the battery management system BMS, and an output end of the battery management system BMS is electrically connected to an input end of the second power supply unit.
As shown in fig. 3, the second power supply unit includes a DC transformer DC-DC, an input end of which is electrically connected to an output end of the battery management system BMS, and an output end of which is electrically connected to the power access end of the MCU, the power access end of the analog grounding unit, the power access end of the closing unit, and the power access end of the resetting unit, respectively.
As shown in fig. 4, the remote communication unit further comprises a remote radio module, and a communication port of the remote radio module is electrically connected with the serial interface of the MCU. The MCU is used for carrying out radio communication with the peripheral remote control device through the remote communication unit, and the peripheral remote control device is used for controlling the device.
As shown in fig. 5, the device further comprises a memory unit, wherein the memory unit is an electrified erasable programmable read-only memory, and the memory unit is electrically connected with the bidirectional two-wire synchronous serial bus of the MCU. And the charged erasable programmable read-only memory is used for storing and reading test data into the charged erasable programmable read-only memory through the MCU.
As shown in fig. 6, the MCU is a single chip microcomputer. As shown in fig. 7, the analog grounding unit includes a TEST resistor TEST-R, a first relay JK1, and a second optocoupler PH2, one end of a normally open contact of the first relay JK1 is electrically connected to one phase of a cable connected to the feed switch, the other end of the normally open contact of the first relay JK1 is grounded, one end of a coil of the first relay JK1 is electrically connected to an output end of the power supply unit, the other end of the coil of the first relay JK1 is electrically connected to an output collector of the second optocoupler PH2, an emitter of the output end of the second optocoupler PH2 is grounded, an input positive electrode of the second optocoupler PH2 is electrically connected to an output end of the power supply unit, and an input negative electrode of the second optocoupler PH2 is electrically connected to an output end of the MCU. The optocoupler is used for driving the relay, so that the on-off of the relay is controlled by the MCU, and the MCU is used for controlling the grounding and disconnection of the cable connected with the feed switch.
As shown in fig. 8, the reset unit includes a second relay JK2 and a third optocoupler PH3, where one end of a normally open contact of the second relay JK2 is electrically connected to a reset signal end of the feed switch, the other end of the normally open contact of the second relay JK2 is electrically connected to a reset ground end of the feed switch, one end of a coil of the second relay JK2 is electrically connected to an output end of the power supply unit, the other end of the coil of the second relay JK2 is electrically connected to an output collector of the third optocoupler PH3, an emitter of the output end of the third optocoupler PH3 is grounded, an input positive electrode of the third optocoupler PH3 is electrically connected to an output end of the power supply unit, and an input negative electrode of the third optocoupler PH3 is electrically connected to an output end of the MCU. The relay is driven by the optocoupler, so that the on-off of the relay is controlled by the MCU, and the MCU is used for controlling the feed switch to reset.
As shown in fig. 9, the closing unit includes a third relay JK3 and a fourth optocoupler PH4, where one end of a normally open contact of the third relay JK3 is electrically connected to a closing signal end of the feed switch, the other end of the normally open contact of the third relay JK3 is electrically connected to a closing ground end of the feed switch, one end of a coil of the third relay JK3 is electrically connected to an output end of the power supply unit, the other end of the coil of the third relay JK3 is electrically connected to an output end collector of the fourth optocoupler PH4, an emitter of the output end of the fourth optocoupler PH4 is grounded, an input end positive electrode of the fourth optocoupler PH4 is electrically connected to an output end of the power supply unit, and an input end negative electrode of the fourth optocoupler PH4 is electrically connected to an output end of the MCU.
In the utility model, the MCU control relay and the MCU store and read data to the electrified erasable programmable read-only memory are all in the prior art, so the utility model does not relate to the improved design of the control program.
According to the utility model, by arranging the analog grounding unit, the analog grounding unit is utilized to control any phase and ground wire in the cable connected with the feed switch and control the on-off between any phase and ground wire in the cable, so that the analog grounding is realized, and whether the feed switch cuts off the power supply of the cable under the analog grounding condition is verified; and the feed switch can be switched on and reset after the test is finished through the MCU, the switching-on unit and the reset unit.
The foregoing description of the preferred embodiments of the utility model is not intended to limit the utility model to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and principles of the utility model are intended to be included within the scope of the utility model.
Claims (10)
1. A electric leakage analogue means for testing colliery feed switch in pit, its characterized in that: the remote electric leakage simulation device is used for carrying out electric leakage simulation on electric equipment and/or cables near the electric equipment, the cables are cables for supplying power to the electric equipment by the feed switch, the near-end electric leakage simulation device is used for carrying out electric leakage simulation on the cables at the feed switch, and the remote electric leakage simulation device is electrically connected with the near-end electric leakage simulation device through the cables; the remote electric leakage simulation device and the near-end electric leakage simulation device comprise an MCU, a simulation grounding unit, a closing unit, a resetting unit and a power supply unit, wherein the input end of the power supply unit is connected with a power supply, the output end of the power supply unit is respectively connected with the power supply access end of the MCU, the power supply access end of the simulation grounding unit, the power supply access end of the closing unit and the power supply access end of the resetting unit, the output end of the MCU is respectively connected with the control end of the simulation grounding unit, the control end of the closing unit and the control end of the resetting unit, the input end of the simulation grounding unit is used for being connected with any phase and ground wire in a cable connected with the feeding switch and controlling the on-off between any phase and ground wire in the cable, the closing unit is used for being electrically connected with the closing input end of the feeding switch and controlling the closing of the feeding switch, and the resetting unit is used for being electrically connected with the resetting input end of the feeding switch and controlling the resetting of the feeding switch.
2. The leakage simulator for testing a coal mine underground feed switch of claim 1, wherein: the power supply unit comprises a first power supply unit and a second power supply unit, wherein the input end of the first power supply unit is connected with a power supply, the output end of the first power supply unit is electrically connected with the input end of the second power supply unit, and the output end of the second power supply unit is electrically connected with the power supply access end of the MCU, the power supply access end of the analog grounding unit, the power supply access end of the closing unit and the power supply access end of the resetting unit respectively.
3. The leakage simulator for testing a coal mine underground feed switch of claim 2, wherein: the first power supply unit comprises a voltage switching module (SWITCH), a transformer module (TRANS), an alternating current/direct current converter (AC-DC), a storage Battery (BAT) and a Battery Management System (BMS) for charging the storage Battery (BAT), wherein the input end of the voltage switching module (SWITCH) is connected with a power supply, the output end of the voltage switching module (SWITCH) is electrically connected with the input end of the transformer module (TRANS), the output end of the transformer module (TRANS) is electrically connected with the input end of the alternating current/direct current converter (AC-DC), the output end of the alternating current/direct current converter (AC-DC) is electrically connected with the input end of the Battery Management System (BMS), and the output end of the Battery Management System (BMS) is electrically connected with the input end of the second power supply unit.
4. A leakage simulator for testing a coal mine underground feed switch as defined in claim 3, wherein: the second power supply unit comprises a direct current transformer (DC-DC), wherein the input end of the direct current transformer (DC-DC) is electrically connected with the output end of the Battery Management System (BMS), and the output end of the direct current transformer (DC-DC) is electrically connected with the power supply access end of the MCU, the power supply access end of the analog grounding unit, the power supply access end of the closing unit and the power supply access end of the resetting unit respectively.
5. The leakage simulator for testing a coal mine underground feed switch of claim 1, wherein: the analog grounding unit comprises a TEST resistor (TEST-R), a first relay (JK 1) and a second optocoupler (PH 2), one end of a normally open contact of the first relay (JK 1) is electrically connected with one phase in a cable connected with the feed switch, the other end of the normally open contact of the first relay (JK 1) is grounded, one end of a coil of the first relay (JK 1) is electrically connected with an output end of the power supply unit, the other end of the coil of the first relay (JK 1) is electrically connected with an output end collector of the second optocoupler (PH 2), an output end emitter of the second optocoupler (PH 2) is grounded, an input end positive electrode of the second optocoupler (PH 2) is electrically connected with an output end of the power supply unit, and an input end negative electrode of the second optocoupler (PH 2) is electrically connected with an output end of the MCU.
6. The leakage simulator for testing a coal mine underground feed switch of claim 1, wherein: the reset unit comprises a second relay (JK 2) and a third optocoupler (PH 3), wherein one end of a normally open contact of the second relay (JK 2) is electrically connected with a reset signal end of the feed switch, the other end of the normally open contact of the second relay (JK 2) is electrically connected with a reset grounding end of the feed switch, one end of a coil of the second relay (JK 2) is electrically connected with an output end of the power supply unit, the other end of the coil of the second relay (JK 2) is electrically connected with an output end collector of the third optocoupler (PH 3), an output end emitter of the third optocoupler (PH 3) is grounded, an input end of the third optocoupler (PH 3) is electrically connected with an output end of the power supply unit, and an input end negative electrode of the third optocoupler (PH 3) is electrically connected with an output end of the MCU.
7. The leakage simulator for testing a coal mine underground feed switch of claim 1, wherein: the switching-on unit comprises a third relay (JK 3) and a fourth optocoupler (PH 4), wherein one end of a normally open contact of the third relay (JK 3) is electrically connected with a switching-on signal end of the feed switch, the other end of the normally open contact of the third relay (JK 3) is electrically connected with a switching-on grounding end of the feed switch, one end of a coil of the third relay (JK 3) is electrically connected with an output end of the power supply unit, the other end of the coil of the third relay (JK 3) is electrically connected with an output end collector of the fourth optocoupler (PH 4), an output end emitter of the fourth optocoupler (PH 4) is grounded, an input end of the fourth optocoupler (PH 4) is electrically connected with an output end of the power supply unit, and an input end negative electrode of the fourth optocoupler (PH 4) is electrically connected with an output end of the MCU.
8. The leakage simulator for testing a coal mine underground feed switch of any one of claims 1 to 7, wherein: the remote electric leakage simulation device and the near-end electric leakage simulation device also comprise storage units, wherein the storage units are charged erasable programmable read-only memories, and the storage units are electrically connected with the MCU in a bidirectional two-wire synchronous serial bus.
9. The leakage simulator for testing a coal mine underground feed switch of any one of claims 1 to 7, wherein: the remote electric leakage simulation device and the near-end electric leakage simulation device also comprise remote communication units, the remote communication units are remote radio modules, and communication ports of the remote radio modules are electrically connected with the serial interfaces of the MCU.
10. The leakage simulator for testing a coal mine underground feed switch of any one of claims 1 to 7, wherein: the remote electric leakage simulation device and the near-end electric leakage simulation device both further comprise carrier communication units, a strong electric interface of the carrier communication unit of the near-end electric leakage simulation device is electrically connected with a cable connected with the feed switch, and a weak electric interface of the carrier communication unit of the near-end electric leakage simulation device is electrically connected with a serial interface of the MCU of the near-end electric leakage simulation device; the strong electric interface of the carrier communication unit of the remote electric leakage simulation device is electrically connected with a cable, and the weak electric interface of the carrier communication unit of the remote electric leakage simulation device is electrically connected with the serial interface of the MCU of the remote electric leakage simulation device.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222999792.0U CN219225017U (en) | 2022-11-11 | 2022-11-11 | Leakage simulation device for testing underground coal mine feed switch |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222999792.0U CN219225017U (en) | 2022-11-11 | 2022-11-11 | Leakage simulation device for testing underground coal mine feed switch |
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| CN219225017U true CN219225017U (en) | 2023-06-20 |
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| CN202222999792.0U Active CN219225017U (en) | 2022-11-11 | 2022-11-11 | Leakage simulation device for testing underground coal mine feed switch |
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| GR01 | Patent grant |