A tester for high-voltage power line loss

Abstract

The present invention discloses a tester for high-voltage power line loss, comprising a tester body, a shell installed in the tester body, two internal electric poles installed on the inner wall of the shell, two external electric poles corresponding to the two internal electric poles in a sliding manner connected to the side wall of the shell, an anti-slip mechanism provided in the shell, the anti-slip mechanism comprising two grooves respectively provided on the top and bottom of the shell, a slider slidably connected to the inner wall of the groove, and the side wall of the slider elastically connected to the inner wall of the groove via a first telescopic spring. The present invention sets an anti-slip mechanism, and after the two external electric poles are inserted into the shell and fit with the two internal electric poles, the two insulating rods are located in the two card slots, thereby fixing the positions of the two external electric poles, avoiding the external electric poles and the internal electric poles from falling off and separating during actual use, thereby causing the testing process to be unstable, thereby affecting the work of the power staff and the accuracy of the test results.

Description

Technical Field

[0001] The present invention relates to the technical field of high-voltage power line loss testing, and in particular to a tester for high-voltage power line loss. Background Art

[0002] High-voltage power line loss mainly refers to the general term for reactive power, active power and voltage loss generated when high-voltage electricity is transmitted through the power supply line. High-voltage power line loss is an important operating indicator of power supply companies. The level of line loss and the management of line loss not only directly affect the economic benefits of the company, but also to a certain extent reflect the management level of the power supply company.

[0003] Currently, power companies use various high-voltage power line loss testers when conducting line tests on high-voltage power line loss. Existing high-voltage power line loss testers are connected to the tester via a plug during use. However, in actual use, the connection tightness between the plug and the high-voltage power line loss tester is poor, which can easily cause the plug to fall off, resulting in an unstable test process, which in turn affects the work of power workers and the accuracy of the test results. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems existing in the prior art and to propose a tester for high-voltage power line loss.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A tester for high-voltage power line loss, comprising a tester body, wherein a shell is installed in the tester body, two internal electric poles are installed on the inner wall of the shell, and two external electric poles corresponding to the two internal electric poles are slidably connected to the side wall of the shell, and an anti-slip mechanism is provided in the shell, and the anti-slip mechanism includes two grooves respectively provided on the top and bottom of the shell, the inner walls of the grooves are slidably connected to a slider, the side walls of the slider are elastically connected to the inner walls of the grooves by a first telescopic spring, the side walls of the slider are fixedly connected to the side walls of the external electric poles near the side walls of the slider, a card slot is provided on the side walls of the external electric poles, an insulating rod matching the card slot is slidably connected to the inner wall of the fixing cylinder, and the end of the insulating rod away from the card slot is elastically connected to the inner wall of the fixing cylinder by a first conductive spring, a press switch is installed on the side wall of the tester body, and the press switch is coupled to the first conductive spring through an external power supply, and a protective mechanism is provided in the groove.

[0007] Preferably, the protective mechanism includes a bar magnet rotatably connected to the inner wall of the groove through a rotating shaft, a permanent magnet is embedded in the side wall of the slider away from the first telescopic spring, a circular cavity corresponding to the rotating shaft is opened on the side wall of the shell, one end of the rotating shaft passes through the side wall of the shell and is sealed and rotatably connected to the inner wall of the circular cavity, a first plate is fixedly connected to the bottom of the circular cavity, the side wall of the rotating shaft is sealingly and slidingly connected to the side wall of the first plate, the side wall of the rotating shaft is fixedly connected to the second plate, the side wall of the second plate is sealingly and slidingly connected to the inner wall of the circular cavity, the side wall of the first plate is elastically connected to the side wall of the second plate through a second telescopic spring, a baffle is fixedly connected to the inner wall of the circular cavity away from the second plate, and a driving mechanism is provided in the shell.

[0008] Preferably, the driving mechanism includes a heat absorption chamber opened in the shell and located directly below the circular cavity. Evaporative liquid is provided in the heat absorption chamber. The inner wall of the heat absorption chamber is connected to the inner wall of the shell through a heat absorption plate. The top of the heat absorption chamber is connected to the bottom of the circular cavity through a one-way air injection pipe. The bottom of the circular cavity is connected to the bottom of the heat absorption chamber through a one-way liquid discharge pipe.

[0009] Preferably, a pressure relief valve is installed in the one-way air injection pipe, and the pipe openings above the one-way air injection pipe and the one-way liquid discharge pipe are both located in a sealed space formed by the first plate, the second plate and the circular cavity.

[0010] Preferably, a warning mechanism is provided in the groove, and the warning mechanism includes a first conductive plate embedded in the inner wall of the groove, a second conductive plate cooperating with the second conductive plate is embedded in the side wall of the slider, and a warning light is installed on the side wall of the tester body, and the first conductive plate and the second conductive plate are connected in series with the warning light through an external power supply.

[0011] Preferably, a cooling mechanism is provided on the shell, and the cooling mechanism includes a curved plate fixedly connected to the side wall of the shell, the curved plate is hollow, and a coolant is provided in the curved plate. A flow cavity is opened on the inner wall of the shell, and an arc block is sealingly and slidingly connected to the inner wall of the arc plate. The side wall of the arc block is elastically connected to the inner wall of the arc plate through a second conductive spring, and the inner walls of the arc plate on both sides of the arc block are connected to the top and bottom of the flow cavity through two connecting pipes respectively.

[0012] Preferably, the inner wall of the flow chamber is connected to the inner wall of the shell through multiple heat-conducting rods, the side wall of the second conductive spring is covered with a rubber sleeve, and the first conductive plate and the second conductive plate are connected in series with the second conductive spring through an external power supply and a switch control module.

[0013] Compared with the existing technology, the advantages of the present invention are:

[0014] 1. By setting up an anti-drop mechanism, after the two external electric posts are inserted into the shell and fit with the two internal electric posts, the two insulating rods are located in the two card slots, thereby fixing the positions of the two external electric posts, preventing the external electric posts from falling off and separating from the internal electric posts during actual use, which would cause the test process to be unstable, thereby affecting the work of the power staff and the accuracy of the test results.

[0015] 2. By setting up a protective mechanism, when a circuit overload occurs during the use of the tester body, the rotating shaft will drive the bar magnet to rotate 180° counterclockwise, and then the end of the bar magnet close to the slider will be attracted by the permanent magnet, so that the slider drives the external electric post to move outward through the fixed tube and the insulating rod, so that the external electric post is separated from the internal electric post, and the circuit is disconnected, thereby avoiding dangerous situations such as electric shock and fire when the tester body is in use.

[0016] 3. By setting up a warning mechanism, when the circuit is disconnected, the warning light will flash continuously to remind the staff, so that the staff can take corresponding protective measures at the first time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural schematic diagram of a tester for high-voltage power line loss proposed by the present invention;

[0018] Figure 2 for Figure 1 A schematic diagram of the structure at center A;

[0019] Figure 3 This is a rear cross-sectional schematic diagram of a tester for high-voltage power line loss proposed by the present invention;

[0020] Figure 4 for Figure 3 A magnified schematic diagram of the structure at B in the middle;

[0021] Figure 5 This is a schematic side cross-sectional structural diagram of a curved plate in a tester for high-voltage power line loss proposed by the present invention.

[0022] In the figure: 1 tester body, 2 shell, 3 internal electric post, 4 external electric post, 5 groove, 6 slider, 7 first telescopic spring, 8 slot, 9 fixing cylinder, 10 insulating rod, 11 first conductive spring, 12 push switch, 13 rotating shaft, 14 bar magnet, 15 permanent magnet, 16 circular cavity, 17 first plate, 18 second plate, 19 second telescopic spring, 20 heat absorption cavity, 21 heat absorption plate, 22 one-way air injection pipe, 23 one-way liquid discharge pipe, 24 baffle, 25 first conductive plate, 26 second conductive plate, 27 warning light, 28 arc plate, 29 flow cavity, 30 connecting pipe, 31 heat-conducting rod, 32 arc block, 33 second conductive spring. DETAILED DESCRIPTION

[0023] Reference Figure 1-5 A tester for high-voltage power line loss includes a tester body 1, a shell 2 is installed in the tester body 1, two internal electric poles 3 are installed on the inner wall of the shell 2, and two external electric poles 4 corresponding to the two internal electric poles 3 are slidably connected to the side wall of the shell 2. It should be noted that when the two external electric poles 4 are in contact with the two internal electric poles 3, the tester body 1 can detect high-voltage power line loss, which is an existing technology.

[0024] An anti-slip mechanism is provided in the shell 2, and the anti-slip mechanism includes two grooves 5 respectively opened at the top and bottom of the shell 2. The inner wall of the groove 5 is slidably connected with a slider 6, and the side wall of the slider 6 is elastically connected to the inner wall of the groove 5 through a first telescopic spring 7. The side wall of the slider 6 close to the external electric column 4 is fixedly connected with a fixed cylinder 9, and a card slot 8 is opened on the side wall of the external electric column 4. The inner wall of the fixed cylinder 9 is slidably connected with an insulating rod 10 that cooperates with the card slot 8. The end of the insulating rod 10 away from the card slot 8 is elastically connected to the inner wall of the fixed cylinder 9 through a first conductive spring 11. A press switch 12 is installed on the side wall of the tester body 1, and the press switch 12 is coupled with the first conductive spring 11 through an external power supply.

[0025] It should be noted that there is an electromagnet adsorption device inside the push switch 12. When the button is pressed, the electromagnet inside generates magnetism on behalf of electricity, and then the circuit is connected or disconnected through this adsorption device, thereby realizing functions such as remote control of the circuit, which is existing technology.

[0026] Furthermore, when the two external electric poles 4 need to be inserted into the shell 2, the press switch 12 is adjusted at this time so that the two first conductive springs 11 located in the two fixed tubes 9 are energized and contracted, and then the two external electric poles 4 can be inserted into the shell 2 and fit together with the two internal electric poles 3. Then the press switch 12 is adjusted again so that the two first conductive springs 11 are de-energized and extended, thereby driving the two insulating rods 10 to be located in the two slots 8 respectively, thereby fixing the positions of the two external electric poles 4, and avoiding the external electric pole 4 and the internal electric pole 3 from falling off and separating during actual use, which makes the testing process unstable, thereby affecting the work of the power staff and the accuracy of the test results.

[0027] A protective mechanism is provided in the groove 5, which includes a bar magnet 14 rotatably connected to the inner wall of the groove 5 through a rotating shaft 13, a permanent magnet 15 is embedded in the side wall of the slider 6 away from the first telescopic spring 7, and a circular cavity 16 corresponding to the rotating shaft 13 is opened on the side wall of the shell 2. One end of the rotating shaft 13 passes through the side wall of the shell 2 and is sealed and rotatably connected to the inner wall of the circular cavity 16. A first plate 17 is fixedly connected to the bottom of the circular cavity 16, and the side wall of the rotating shaft 13 is sealed and slidably connected to the side wall of the first plate 17. A second plate 18 is fixedly connected to the side wall of the rotating shaft 13, and the side wall of the second plate 18 is sealed and slidably connected to the inner wall of the circular cavity 16. The side wall of the first plate 17 is elastically connected to the side wall of the second plate 18 through a second telescopic spring 19. A baffle 24 is fixedly connected to the inner wall of the circular cavity 16 away from the second plate 18, and a driving mechanism is provided in the shell 2.

[0028] It should be noted that, in the initial state, the angle between the first plate 17 and the second plate 18 is 90°. Figure 4 As shown, at this time, the end of the bar magnet 14 close to the slider 6 repels the permanent magnet 15, so that the position of the slider 6 remains constant. Furthermore, the bar magnet 14 and the permanent magnet 15 are both made of neodymium iron boron magnets.

[0029] The driving mechanism includes a heat absorption chamber 20 opened in the shell 2 and located directly below the circular cavity 16. An evaporative liquid is provided in the heat absorption chamber 20. It should be noted that the evaporative liquid is a hexane solution with a boiling point of 68.7°C. The inner wall of the heat absorption chamber 20 is connected to the inner wall of the shell 2 through a heat absorption plate 21. The top of the heat absorption chamber 20 is connected to the bottom of the circular cavity 16 through a one-way jet pipe 22. The bottom of the circular cavity 16 is connected to the bottom of the heat absorption chamber 20 through a one-way liquid discharge pipe 23.

[0030] A pressure relief valve is installed in the one-way air injection pipe 22 . The nozzles above the one-way air injection pipe 22 and the one-way liquid discharge pipe 23 are both located in the sealed space formed by the first plate 17 , the second plate 18 and the circular cavity 16 .

[0031] Furthermore, the first plate 17 and the second plate 18 are sealedly connected to the side wall of the rotating shaft 13 and the inner wall of the circular cavity 16. At the same time, the connection between the rotating shaft 13 and the circular cavity 16 is a sealed connection, so that after the evaporative liquid enters the circular cavity 16, the evaporative liquid cannot leak and can be used safely.

[0032] It should be noted that the one-way air injection pipe 22 only allows gas to enter the circular cavity 16 from the heat absorption cavity 20 , and the one-way liquid discharge pipe 23 only allows liquid to enter the heat absorption cavity 20 from the circular cavity 16 .

[0033] Furthermore, when a circuit overload occurs during the use of the tester body 1, a large amount of heat will be emitted from the connection between the external electric post 4 and the internal electric post 3, causing the temperature inside the shell 2 to rise, and then the heat absorption chamber 20 absorbs heat through the heat absorption plate 21, causing the evaporative liquid in the heat absorption chamber 20 to evaporate continuously, and then the pressure in the heat absorption chamber 20 continues to increase. When the pressure increases to the critical value of the pressure relief valve, the gaseous evaporative liquid in the heat absorption chamber 20 is sprayed into the circular cavity 16 through the one-way jet pipe 22, thereby pushing the second plate 18 to rotate 180° counterclockwise and fit into the upper end of the baffle 24. At this time, the rotating shaft 13 will drive the bar magnet 14 to rotate 180° counterclockwise, and then the end of the bar magnet 14 close to the slider 6 is attracted by the permanent magnet 15, so that the slider 6 drives the external electric post 4 to move outward through the fixed tube 9 and the insulating rod 10, so that the external electric post 4 is separated from the internal electric post 3, and the circuit is disconnected, thereby avoiding dangerous situations such as electric shock and fire when the tester body 1 is in use.

[0034] A warning mechanism is provided in the groove 5, which includes a first conductive plate 25 embedded in the inner wall of the groove 5, a second conductive plate 26 that cooperates with the first conductive plate 25 is embedded in the side wall of the slider 6, and a warning light 27 is installed on the side wall of the tester body 1. The first conductive plate 25 and the second conductive plate 26 are connected in series with the warning light 27 through an external power supply.

[0035] Furthermore, when the attraction between the bar magnet 14 and the permanent magnet 15 is balanced with the elastic force of the first telescopic spring 7, the first conductive plate 25 will fit with the second conductive plate 26, and the warning light 27 will flash continuously, thereby reminding the staff and facilitating the staff to take corresponding protective measures in the first time.

[0036] A cooling mechanism is provided on the shell 2, which includes an arc-shaped plate 28 fixedly connected to the side wall of the shell 2. The arc-shaped plate 28 is hollow and has coolant inside. A flow cavity 29 is provided on the inner wall of the shell 2. An arc block 32 is sealingly and slidingly connected to the inner wall of the arc plate 28. The side wall of the arc block 32 is elastically connected to the inner wall of the arc plate 28 through a second conductive spring 33. The inner walls of the arc plate 28 on both sides of the arc block 32 are connected to the top and bottom of the flow cavity 29 through two connecting pipes 30 respectively.

[0037] The inner wall of the flow chamber 29 is connected to the inner wall of the shell 2 through multiple heat-conducting rods 31. The side wall of the second conductive spring 33 is covered with a rubber sleeve. The first conductive plate 25 and the second conductive plate 26 are connected in series with the second conductive spring 33 through an external power supply and a switch control module.

[0038] It should be noted that the switch control module can intermittently energize and de-energize the second conductive spring 33 , which is a prior art.

[0039] Furthermore, the contact between the first conductive plate 25 and the second conductive plate 26 causes the switch control module to intermittently energize the second conductive spring 33, and the second conductive spring 33 continuously expands and contracts, causing the arc block 32 to slide back and forth on the inner wall of the arc plate 28, and the coolant in the arc plate 28 can circulate in the flow cavity 29, which can cool the shell 2 and ensure the safety of the tester body 1 during operation.

[0040] It should be noted that when power is applied to the second conductive spring 33, it acts as a solenoid, and each turn of the spring acts as a circular current, with the current flowing in the same direction. Due to the mutual attraction between currents flowing in the same direction, each turn of the spring attracts the adjacent springs, causing the second conductive spring 33 to contract as a whole. When power is removed from the second conductive spring 33, the current in each turn of the spring disappears, and each turn of the spring no longer attracts the adjacent springs. Consequently, the second conductive spring 33 returns to its original position under its own elastic force. In other words, when power is intermittently applied to the second conductive spring 33, the second conductive spring 33 continuously expands and contracts.

[0041] In the present invention, when the tester body 1 is in use, the two external electric posts 4 are inserted into the shell 2, and then the press switch 12 is adjusted so that the two first conductive springs 11 located in the two fixed tubes 9 are energized and contracted, and then the two insulating rods 10 are respectively contracted into the two fixed tubes 9, and then the two external electric posts 4 can be inserted into the shell 2 to fit with the two internal electric posts 3. At this time, the tester body 1 can detect the high-voltage power line loss, and then the press switch 12 is adjusted again so that the two first conductive springs 11 are de-energized and extended, and then the two insulating rods 10 are respectively driven to be located in the two card slots 8, thereby fixing the positions of the two external electric posts 4;

[0042] When the circuit is overloaded during the use of the tester body 1, a large amount of heat will be emitted from the connection between the external electric post 4 and the internal electric post 3, causing the temperature inside the shell 2 to rise, and then the heat absorption chamber 20 absorbs heat through the heat absorption plate 21, causing the temperature of the evaporation liquid in the heat absorption chamber 20 to rise and evaporate continuously, and then the pressure in the heat absorption chamber 20 continues to increase. When the pressure reaches the critical value of the pressure relief valve installed in the one-way jet pipe 22, the gaseous evaporation liquid in the heat absorption chamber 20 is sprayed into the circular cavity 16 through the one-way jet pipe 22, so that the first plate 17 The pressure in the sealed space formed by the second plate 18 and the circular cavity 16 increases, thereby pushing the second plate 18 to rotate 180° counterclockwise and fit into the upper end of the baffle 24. At this time, the rotating shaft 13 will drive the bar magnet 14 to rotate 180° counterclockwise, and then the end of the bar magnet 14 close to the slider 6 is attracted to the permanent magnet 15, so that the slider 6 drives the external electric post 4 to move outward through the fixing tube 9 and the insulating rod 10, so that the external electric post 4 is separated from the internal electric post 3, and the circuit is disconnected, thereby avoiding dangerous situations such as electric shock and fire when the tester body 1 is used;

[0043] When the slider 6 slides so that the elastic force of the first telescopic spring 7 is balanced with the attraction between the bar magnet 14 and the permanent magnet 15, the first conductive plate 25 will fit with the second conductive plate 26, and the warning light 27 will flash continuously, thereby reminding the staff and facilitating the staff to take corresponding protective measures in the first time. At this time, the external power supply will intermittently energize the second conductive spring 33 through the switch control module, and the second conductive spring 33 will continuously expand and contract, causing the arc block 32 to slide back and forth on the inner wall of the arc plate 28, and the coolant in the arc plate 28 can circulate in the flow cavity 29 through the two connecting pipes 30, thereby cooling the inside of the housing 2;

[0044] After the temperature inside the shell 2 drops, the temperature of the gaseous evaporative liquid in the heat absorption chamber 20 and the circular chamber 16 drops, and the liquid evaporative liquid after the gaseous evaporative liquid in the circular chamber 16 cools down and liquefies will re-enter the heat absorption chamber 20 through the one-way drain pipe 23, so that it is convenient for next use. At the same time, the second plate 18 will rotate 180° clockwise under the action of the second telescopic spring 19 to return to its original position, and then the end of the bar magnet 14 close to the slider 6 will repel the permanent magnet 15, so that when the slider 6 moves, it will drive the two external electric posts 4 to return to their original positions and respectively fit with the two internal electric posts 3, so that the tester body 1 can be used again.

Claims

1. A tester for high-voltage power line loss, comprising a tester body (1), characterized in that: The tester body (1) is provided with a shell (2), the inner wall of the shell (2) is provided with two internal electric posts (3), the side wall of the shell (2) is slidably connected with two external electric posts (4) corresponding to the two internal electric posts (3), and the shell (2) is provided with an anti-slip mechanism, which includes two grooves (5) respectively provided on the top and bottom of the shell (2), the inner wall of the groove (5) is slidably connected with a slider (6), the side wall of the slider (6) is elastically connected to the inner wall of the groove (5) through a first telescopic spring (7), and the slider (6) is close to the inner wall of the groove (5). The side wall of the external electric column (4) is fixedly connected with a fixed cylinder (9), the side wall of the external electric column (4) is provided with a card slot (8), the inner wall of the fixed cylinder (9) is slidably connected with an insulating rod (10) that cooperates with the card slot (8), the end of the insulating rod (10) away from the card slot (8) is elastically connected to the inner wall of the fixed cylinder (9) through a first conductive spring (11), the side wall of the tester body (1) is installed with a press switch (12), the press switch (12) is coupled with the first conductive spring (11) through an external power supply, and a protective mechanism is provided in the groove (5); The protective mechanism includes a bar magnet (14) rotatably connected to the inner wall of the groove (5) via a rotating shaft (13); a permanent magnet (15) is embedded in the side wall of the slider (6) away from the first telescopic spring (7); a circular cavity (16) corresponding to the rotating shaft (13) is opened on the side wall of the shell (2); one end of the rotating shaft (13) passes through the side wall of the shell (2) and is sealed and rotatably connected to the inner wall of the circular cavity (16); a first plate (17) is fixedly connected to the bottom of the circular cavity (16); The side wall of the rotating shaft (13) is sealed and slidably connected to the side wall of the first plate (17); the side wall of the rotating shaft (13) is fixedly connected to the second plate (18); the side wall of the second plate (18) is sealed and slidably connected to the inner wall of the circular cavity (16); the side wall of the first plate (17) is elastically connected to the side wall of the second plate (18) via a second telescopic spring (19); a baffle (24) is fixedly connected to the inner wall of the circular cavity (16) away from the second plate (18); and a driving mechanism is provided in the housing (2).

2. A tester for high-voltage power line loss according to claim 1, characterized in that: The driving mechanism comprises a heat absorption chamber (20) provided in the shell (2) and located directly below the circular chamber (16); an evaporative liquid is provided in the heat absorption chamber (20); the inner wall of the heat absorption chamber (20) is communicated with the inner wall of the shell (2) via a heat absorption plate (21); the top of the heat absorption chamber (20) is communicated with the bottom of the circular chamber (16) via a one-way jet pipe (22); and the bottom of the circular chamber (16) is communicated with the bottom of the heat absorption chamber (20) via a one-way liquid discharge pipe (23).

3. A tester for high-voltage power line loss according to claim 2, characterized in that: A pressure relief valve is installed in the one-way jet pipe (22), and the pipe openings above the one-way jet pipe (22) and the one-way liquid discharge pipe (23) are both located in a sealed space formed by the first plate (17), the second plate (18) and the circular cavity (16).

4. A tester for high-voltage power line loss according to claim 1, characterized in that: A warning mechanism is provided in the groove (5), comprising a first conductive plate (25) embedded in the inner wall of the groove (5), a second conductive plate (26) matched with the first conductive plate (25) embedded in the side wall of the slider (6), a warning light (27) installed on the side wall of the tester body (1), and the first conductive plate (25) and the second conductive plate (26) are connected in series with the warning light (27) via an external power supply.

5. A tester for high-voltage power line loss according to claim 4, characterized in that: The shell (2) is provided with a cooling mechanism, which includes an arc plate (28) fixedly connected to the side wall of the shell (2), the arc plate (28) is hollow, and a coolant is provided in the arc plate (28), and a flow cavity (29) is opened on the inner wall of the shell (2), and the inner wall of the arc plate (28) is sealed and slidably connected with an arc block (32), and the side wall of the arc block (32) is elastically connected to the inner wall of the arc plate (28) through a second conductive spring (33), and the inner walls of the arc plate (28) located on both sides of the arc block (32) are respectively connected to the top and bottom of the flow cavity (29) through two connecting pipes (30).

6. A tester for high-voltage power line loss according to claim 5, characterized in that: The inner wall of the flow chamber (29) is connected to the inner wall of the housing (2) through a plurality of heat-conducting rods (31); a rubber sleeve is provided on the side wall of the second conductive spring (33); and the first conductive plate (25) and the second conductive plate (26) are connected in series with the second conductive spring (33) through an external power supply and a switch control module.

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