A power distribution transformer energy efficiency testing device

Abstract

This invention discloses a distribution transformer energy efficiency testing device, relating to the field of distribution transformer testing technology. It includes a main housing with a top cover rotatably connected to its top surface. A control panel is installed inside the main housing for testing the energy efficiency of the distribution transformer. An automatic plug-in / plug-out mechanism is installed on the bottom surface of the top cover for automatically plugging and unplugging the connecting cables between the distribution transformer and the control panel. Through this automatic plug-in / plug-out mechanism, a horizontal frame is moved, adjusting the lateral position of the moving docking mechanism. The longitudinal position of the moving docking mechanism is adjusted by a track slider, allowing the moving docking mechanism to connect the connecting cables between the distribution transformer and the control panel to different ports. This enables the testing of the distribution transformer's load current, operating voltage, operating temperature, and other energy efficiency parameters without requiring manual on-site connector conversion.

Description

Technical Field

[0001] This invention relates to the field of power distribution transformer testing technology, and specifically to a power distribution transformer energy efficiency testing device. Background Technology

[0002] The distribution transformer energy efficiency testing device is a specialized device for testing the energy efficiency of distribution transformers. Most distribution transformer energy efficiency testing devices are portable, which makes them easy to carry and reduces the testing cost of distribution transformers. The distribution transformer energy efficiency testing device can detect energy efficiency data such as voltage, current and operating temperature of the distribution transformer, and can determine whether the distribution transformer can continue to work normally.

[0003] Current power distribution transformer energy efficiency testing devices are shown in the attached document. Figure 7 As shown, when testing the energy efficiency of a distribution transformer, staff need to connect the distribution transformer energy efficiency testing device to the distribution transformer at close range, and then connect the circuit of the distribution transformer. Testing different energy efficiencies also requires staff to connect the distribution transformer to different interfaces on the distribution transformer energy efficiency testing device on site. Since the input voltage of the distribution transformer is very high, there are great safety hazards and electric shock accidents are likely to occur during the process of staff changing the interface. Summary of the Invention

[0004] To overcome the aforementioned technical problems, the present invention aims to provide a power distribution transformer energy efficiency testing device. Through an automatic plugging and unplugging mechanism, a horizontal frame is moved, and the horizontal frame adjusts the lateral position of the moving docking mechanism. The longitudinal position of the moving docking mechanism is adjusted via a track slider, allowing the moving docking mechanism to connect the power distribution transformer and the control panel to different ports. This enables the testing of the power distribution transformer's load current, operating voltage, operating temperature, and other energy efficiency parameters without requiring manual on-site connector conversion.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A distribution transformer energy efficiency testing device includes a main housing, a top cover rotatably connected to the top surface of the main housing, a control panel installed inside the main housing for testing the energy efficiency of the distribution transformer, an automatic plug-in mechanism installed on the bottom surface of the top cover for automatically plugging and unplugging the connecting cable between the distribution transformer and the control panel, and an opening mechanism between the main housing and the top cover.

[0007] The automatic insertion and removal mechanism includes a horizontal frame, with track sliders fixedly connected to both ends of the horizontal frame. The track sliders are movably disposed at the bottom of the device top cover. A horizontal lead screw is installed on the inner side of the horizontal frame via bearings. An insertion and removal track is nested on the side of the horizontal lead screw. A movable docking mechanism is provided on the inner side of the insertion and removal track.

[0008] As a further aspect of the present invention: the device top cover includes a top cover body, one end of the bottom surface of the top cover body is fixedly connected to a rotating bushing, and a plurality of external detection ports are provided at the middle position of the bottom surface of the top cover body. A longitudinal track is provided on the outer side of the external detection ports. The plurality of external detection ports correspond to the detection of energy efficiency parameters such as load current, operating voltage, and operating temperature of the distribution transformer. The load current is provided by a current sensor, the operating voltage by a voltage sensor, and the operating temperature by a temperature sensor. The rotating bushing cooperates with the top surface of the device main housing. The rotating shaft ensures that the top cover body can rotate freely on the top surface of the main housing. The opening mechanism includes two sets of hydraulic push rods, both ends of which are movably connected to rotating seats. The rotating seat at one end of the hydraulic push rod is fixedly connected to the top cover body, while the rotating seat at the other end of the hydraulic push rod is set on the main housing. A hidden groove can be opened on the top surface of the main housing to hide the hydraulic push rod and the rotating seat. When it is necessary to open the top cover body, the hydraulic push rod can be activated. The output end of the hydraulic push rod will push the top cover body through the rotating seat, so that the top cover body will automatically open on the top surface of the main housing.

[0009] As a further aspect of the present invention: the longitudinal track includes a connecting rod, with track rods fixedly connected to both ends of the connecting rod; a longitudinal lead screw is mounted on the inner side of the track rod via a bearing; limit grooves are formed on the top and bottom surfaces of the track rod; a limit slider that matches the limit groove is fixedly connected to the inner side of the track slider near the limit groove; and a ball nut that matches the longitudinal lead screw is fixedly connected to the inner side of the track slider near the longitudinal lead screw.

[0010] As a further aspect of the present invention: the insertion and removal track includes a track body, a nut that matches the transverse lead screw is fixedly connected to one side of the track body near the position of the transverse lead screw, a steel coil is installed on the inner side of the track body through a rotating shaft, a steel strip is wound around the side of the steel coil, and a track groove is opened in the middle position on the side of the track body near the moving docking mechanism.

[0011] As a further aspect of the present invention: the cross-section of the steel bar is arc-shaped, and a first guide wheel and a second guide wheel are installed in the middle of the side of the track body near the steel bar. The track body has a moving groove that matches the steel bar along its trajectory.

[0012] As a further aspect of the present invention: the mobile docking mechanism includes a main body, and limiting blocks that fit into the track groove are fixedly connected to both sides of the main body near the track groove. The end of the steel bar away from the steel coil is fixedly connected to the top surface of the limiting block.

[0013] As a further aspect of the present invention: an access terminal is fixedly connected to the top surface of the main body of the mechanism, the access terminal is used to connect to the distribution transformer through a wire, a connecting wire is connected to the bottom of the access terminal, and the end of the connecting wire away from the access terminal passes through the main body of the mechanism and is connected to a docking end, the docking end being compatible with an external detection port.

[0014] As a further aspect of the present invention: a fixed track is fixedly connected to the bottom surface of the main body of the mechanism near the docking end, a transverse slide rod is nested in the bottom surface of the fixed track, a longitudinal slide plate is nested in the bottom surface of the transverse slide rod, the bottom surface of the longitudinal slide plate is fixedly connected to the top surface of the docking end, and springs are connected between the transverse slide rod, the transverse slide rod and the main body of the mechanism.

[0015] As a further aspect of the present invention: a first magnet is fixedly connected to the bottom end of the docking end, and a second magnet is fixedly connected to the top surface of the external detection port, wherein the magnetic poles of the bottom surface of the first magnet are opposite to the magnetic poles of the top surface of the second magnet.

[0016] The beneficial effects of this invention are:

[0017] 1. In this invention, an automatic plugging and unplugging mechanism is set up to move the horizontal frame. The horizontal frame adjusts the horizontal position of the moving docking mechanism, and the longitudinal position of the moving docking mechanism is adjusted by the track slider. This allows the moving docking mechanism to connect the connection cable between the distribution transformer and the control panel to different ports, thereby realizing the detection of energy efficiency such as load current, operating voltage, and operating temperature of the distribution transformer without the need for manual on-site conversion of connectors.

[0018] 2. In this invention, the curved steel strip can enhance the strength of the upright steel strip. The first guide wheel and the second guide wheel can play a guiding role on the one hand, and reduce the friction when the steel strip moves on the other hand.

[0019] 3. In this invention, the longitudinal and transverse lead screws can transport the movable docking mechanism to external detection ports at different locations, enabling remote detection of load current, operating voltage, or operating temperature of the power distribution transformer.

[0020] 4. In this invention, by setting the docking end, when the main body of the mechanism moves the docking end to the position of the external detection port, when the first magnet at the bottom of the docking end and the second magnet on the top surface of the external detection port approach each other, the first magnet and the second magnet have opposite magnetic poles, thus generating an attractive force. Furthermore, the horizontal slide bar and the vertical slide plate set at the bottom of the fixed track can finely adjust the position of the docking end, thereby achieving automatic alignment between the docking end and the external detection port, ensuring that the docking end can be properly inserted into the inner side of the external detection port. Attached Figure Description

[0021] The invention will now be further described with reference to the accompanying drawings.

[0022] Figure 1 This is a schematic diagram of the structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the structure of the top cover of the device in this invention;

[0024] Figure 3 This is a schematic diagram of the longitudinal track in this invention;

[0025] Figure 4 This is a schematic diagram of the automatic insertion and removal mechanism in this invention;

[0026] Figure 5 This is a schematic diagram of the internal structure of the insertion / removal track in this invention;

[0027] Figure 6 This is a schematic diagram of the moving docking mechanism in this invention;

[0028] Figure 7 This is a connection diagram of the power distribution transformer energy efficiency testing device in the prior art.

[0029] In the diagram: 1. Main housing of the device; 2. Top cover of the device; 21. Main body of the top cover; 22. Rotating bushing; 23. External detection port; 24. Longitudinal track; 241. Connecting rod; 242. Track rod; 243. Longitudinal lead screw; 244. Limiting groove; 3. Opening mechanism; 4. Control panel; 5. Automatic insertion and removal mechanism; 51. Horizontal frame; 52. Track slider; 53. Ball nut; 54. Limiting slider; 55. Horizontal lead screw; 56. Insertion and removal track; 561. Track body; 562. Steel coil; 563. Steel bar; 564. First guide wheel; 565. Second guide wheel; 566. Track groove; 57. Moving docking mechanism; 571. Mechanism body; 572. Access terminal; 573. Limiting block; 574. Fixed track; 575. Horizontal slide bar; 576. Longitudinal slide plate; 577. Docking end; 578. Connecting wire. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] like Figures 1-6 As shown, a distribution transformer energy efficiency testing device includes a main housing 1, a top cover 2 rotatably connected to the top surface of the main housing 1, a control panel 4 installed inside the main housing 1 for testing the energy efficiency of the distribution transformer, an automatic plug-in mechanism 5 installed on the bottom surface of the top cover 2 for automatically plugging and unplugging the connecting cable between the distribution transformer and the control panel 4, and an opening mechanism 3 between the main housing 1 and the top cover 2.

[0032] like Figure 4 As shown, the automatic insertion and removal mechanism 5 includes a horizontal frame 51, with track sliders 52 fixedly connected to both ends of the horizontal frame 51. The track sliders 52 are movably disposed at the bottom of the device top cover 2. A horizontal lead screw 55 is installed on the inner side of the horizontal frame 51 through a bearing. An insertion and removal track 56 is nested on the side of the horizontal lead screw 55. A movable docking mechanism 57 is provided on the inner side of the insertion and removal track 56.

[0033] During operation, the distribution transformer is connected to the mobile docking mechanism 57 via a wire, and a wireless network module is set up inside the control panel 4. At this time, the control panel 4 can be operated remotely without having to operate the distribution transformer energy efficiency testing device near the distribution transformer. This greatly improves the safety of staff when performing distribution transformer energy efficiency testing.

[0034] Specifically, the horizontal position of the movable docking mechanism 57 is adjusted by the horizontal frame 51, and the vertical position of the movable docking mechanism 57 is adjusted by the track slider 52, so that the movable docking mechanism 57 can connect the connecting cable between the distribution transformer and the control panel 4 to different ports, thereby realizing the detection of energy efficiency such as load current, operating voltage, and operating temperature of the distribution transformer without the need for manual on-site conversion of connectors.

[0035] like Figure 2As shown, the device top cover 2 includes a top cover body 21. A rotating bushing 22 is fixedly connected to one end of the bottom surface of the top cover body 21. Several sets of external detection ports 23 are provided in the middle of the bottom surface of the top cover body 21. A longitudinal track 24 is provided on the outside of the external detection ports 23. The several sets of external detection ports 23 are for detecting the energy efficiency of the distribution transformer, such as load current, operating voltage, and operating temperature. The load current is provided by a current sensor, the operating voltage is provided by a voltage sensor, and the operating temperature is provided by a temperature sensor. The rotating bushing 22 cooperates with the rotating shaft provided on the top surface of the device main box 1. The top cover body 21 can be freely rotated on the top surface of the main box 1 of the device. The opening mechanism 3 includes two sets of hydraulic push rods. Both ends of the hydraulic push rods are movably connected to rotating seats. The rotating seat at one end of the hydraulic push rod is fixedly connected to the top cover body 21, and the rotating seat at the other end of the hydraulic push rod is set on the main box 1 of the device. A hidden groove can be opened on the top surface of the main box 1 of the device to hide the hydraulic push rod and the rotating seat. When it is necessary to open the top cover body 21, the hydraulic push rod can be activated. The output end of the hydraulic push rod will push the top cover body 21 through the rotating seat, so that the top cover body 21 will automatically open on the top surface of the main box 1 of the device.

[0036] like Figure 3 As shown, the longitudinal track 24 includes a connecting rod 241, with track rods 242 fixedly connected to both ends of the connecting rod 241. A longitudinal lead screw 243 is installed on the inner side of the track rod 242 via bearings. Limiting grooves 244 are formed on the top and bottom surfaces of the track rod 242. A limiting slider 54 that matches the limiting groove 244 is fixedly connected to the inner side of the track slider 52 near the limiting groove 244. A ball nut 53 that matches the longitudinal lead screw 243 is fixedly connected to the inner side of the track slider 52 near the longitudinal lead screw 243.

[0037] One end of the longitudinal lead screw 243 can be connected to the motor via a coupling. When the motor is turned on, the output shaft of the motor will drive the longitudinal lead screw 243 through the coupling, causing the longitudinal lead screw 243 to rotate. The rotating longitudinal lead screw 243 will cooperate with the ball nut 53 to allow the track slider 52 to slide freely along the direction of the track rod 242, ensuring that the movable docking mechanism 57 can be transported to the external detection port 23 at different positions.

[0038] like Figure 5 As shown, the insertion and removal rail 56 includes a rail body 561. A nut that matches the transverse lead screw 55 is fixedly connected to one side of the rail body 561 near the transverse lead screw 55. A steel coil 562 is installed on the inner side of the rail body 561 through a rotating shaft. A steel strip 563 is wound on the side of the steel coil 562. A rail groove 566 is opened in the middle of the side of the rail body 561 near the moving docking mechanism 57.

[0039] One end of the steel coil 562 is connected to a motor via a coupling. When the motor is turned on, the steel coil 562 will rotate, allowing the steel strip 563 to be freely released and wound. One end of the transverse lead screw 55 is connected to a motor via a coupling. When the motor drives the transverse lead screw 55 to rotate, the rotating transverse lead screw 55 will cooperate with the nut to realize the transverse movement of the track body 561. When the track body 561 moves laterally, it will also drive the moving docking mechanism 57 to move laterally, thereby ensuring that the moving docking mechanism 57 can move to the position of different external detection ports 23.

[0040] The cross-section of the steel bar 563 is arc-shaped. The first guide wheel 564 and the second guide wheel 565 are installed in the middle of the side of the track body 561 near the steel bar 563. The track body 561 has a moving groove that matches the steel bar 563 along its trajectory.

[0041] The arc-shaped steel bar 563 can enhance the strength of the steel bar 563 standing upright. The first guide wheel 564 and the second guide wheel 565 can play a guiding role on the one hand, and reduce the friction when the steel bar 563 moves on the other hand. The number of steel bars 563 can be set to two sets, symmetrically arranged on both sides of the track groove 566.

[0042] like Figure 6 As shown, the mobile docking mechanism 57 includes a main body 571. On both sides of the main body 571, near the track groove 566, there are fixedly connected limiting blocks 573 that fit into the track groove 566. The end of the steel bar 563 away from the steel coil 562 is fixedly connected to the top surface of the limiting block 573.

[0043] When the steel bar 563 moves, it can drive the limiting block 573 to move in the track groove 566. The moving limiting block 573 will then drive the main body of the mechanism 571 to move, thereby realizing the insertion and removal operation of the main body of the mechanism 571.

[0044] like Figure 6 As shown, an access terminal 572 is fixedly connected to the top surface of the main body 571 of the mechanism. The access terminal 572 is used to connect to the distribution transformer through a wire. A connecting wire 578 is connected to the bottom of the access terminal 572. The end of the connecting wire 578 away from the access terminal 572 passes through the main body 571 of the mechanism and is connected to a mating end 577. The mating end 577 is compatible with the external detection port 23.

[0045] During operation, the distribution transformer is connected to the access terminal 572 via a wire. The access terminal 572 is then connected to the docking end 577 via a connecting wire 578. When the docking end 577 is inserted into the inside of the external detection port 23, the distribution transformer is connected to the distribution transformer energy efficiency detection device, and the energy efficiency of the distribution transformer can then be tested.

[0046] like Figure 6 As shown, a fixed track 574 is fixedly connected to the bottom surface of the main body 571 near the docking end 577. A transverse slide rod 575 is nested on the bottom surface of the fixed track 574. A longitudinal slide plate 576 is nested on the bottom surface of the transverse slide rod 575. The bottom surface of the longitudinal slide plate 576 is fixedly connected to the top surface of the docking end 577. A spring is connected between the transverse slide rod 575 and the main body 571. A magnet piece 1 is fixedly connected to the bottom end of the docking end 577. A magnet piece 2 is fixedly connected to the top surface of the external detection port 23. The magnetic poles of the bottom surface of the magnet piece 1 are opposite to the magnetic poles of the top surface of the magnet piece 2.

[0047] During operation, when the main body 571 moves the docking end 577 to the position of the external detection port 23, the first magnet at the bottom of the docking end 577 and the second magnet on the top surface of the external detection port 23 approach each other. Due to their opposite magnetic poles, the first magnet and the second magnet generate an attractive force. Furthermore, the horizontal slide bar 575 and the vertical slide plate 576 at the bottom of the fixed track 574 can finely adjust the position of the docking end 577, thereby achieving automatic alignment between the docking end 577 and the external detection port 23 and ensuring that the docking end 577 can be properly inserted into the inside of the external detection port 23.

[0048] Working principle of the invention:

[0049] First, open the top cover 2 of the device through the unpacking mechanism 3. Then, connect the distribution transformer to the access terminal 572 via wires. At this point, the staff can leave the distribution transformer energy efficiency testing device and the testing site of the distribution transformer. Operate the control panel 4 through the wireless network module, and then control the automatic plugging and unplugging mechanism 5 through the control panel 4. When it is necessary to test the load current, operating voltage, or operating temperature of the distribution transformer, first turn on the motor at one end of the longitudinal lead screw 243. The output shaft of the motor will drive the longitudinal lead screw 243 through the coupling, causing the longitudinal lead screw 243 to rotate. The rotating longitudinal lead screw 243 will cooperate with the ball nut 53, allowing the track slider 52 to slide freely along the direction of the track rod 242, realizing the longitudinal movement of the moving docking mechanism 57. Then, turn on the motor at one end of the transverse lead screw 55. When the motor drives the transverse lead screw 55 to rotate, the rotating transverse lead screw 55 will cooperate with the nut, realizing the transverse movement of the track body 561, thereby ensuring the moving docking mechanism 57. The connecting mechanism 57 moves to the position of the corresponding external detection port 23 and turns on the motor connecting the steel coil 562. When the motor is turned on, the steel coil 562 will rotate and release the steel bar 563. The steel bar 563 will move along the moving groove and push the limiting block 573, so that the limiting block 573 moves in the track groove 566. The moving limiting block 573 will drive the main body of the mechanism 571 to move, thereby driving the docking end 577 to approach the external detection port 23. When the first magnet at the bottom of the docking end 577 and the second magnet on the top surface of the external detection port 23 approach each other, the magnets will generate an attraction force due to their opposite magnetic poles. The horizontal slide bar 575 and the vertical slide plate 576 at the bottom of the fixed track 574 can finely adjust the position of the docking end 577, thereby realizing the automatic alignment of the docking end 577 with the external detection port 23 and ensuring that the docking end 577 can be properly inserted into the inside of the external detection port 23.

[0050] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A distribution transformer energy efficiency testing device, comprising a main housing (1), wherein a device top cover (2) is rotatably connected to the top surface of the main housing (1), and a control panel (4) is installed on the inner side of the main housing (1), the control panel (4) being used to test the energy efficiency of the distribution transformer, characterized in that: The bottom surface of the device top cover (2) is provided with an automatic plug mechanism (5) for automatically plugging the connecting cable between the power distribution transformer and the control panel (4), and an opening mechanism (3) is arranged between the device main box (1) and the device top cover (2). The automatic plug mechanism (5) comprises a transverse frame (51), both ends of the transverse frame (51) are fixedly connected with track slides (52), the track slides (52) are movably arranged at the bottom of the device top cover (2), the inner side of the transverse frame (51) is provided with a transverse lead screw (55) through a bearing, the side surface of the transverse lead screw (55) is nested with a plug track (56), and the inner side of the plug track (56) is provided with a moving butt joint mechanism (57). The plug track (56) comprises a track main body (561), one side of the track main body (561) is fixedly connected with a nut matched with the transverse lead screw (55) at the position close to the transverse lead screw (55), the inner side of the track main body (561) is provided with a steel reel (562) through a rotating shaft, the side surface of the steel reel (562) is wound with a steel bar (563), and the side of the track main body (561) close to the moving butt joint mechanism (57) is provided with a track groove (566) at the middle position. The moving butt joint mechanism (57) comprises a mechanism main body (571), both sides of the mechanism main body (571) are fixedly connected with limiting blocks (573) matched with the track groove (566) at the positions close to the track groove (566), and one end of the steel bar (563) away from the steel reel (562) is fixedly connected with the top surface of the limiting block (573).

2. The power distribution transformer energy efficiency detection device of claim 1, wherein, The device top cover (2) comprises a top cover main body (21), one end of the bottom surface of the top cover main body (21) is fixedly connected with a rotating shaft sleeve (22), a plurality of groups of external detection ports (23) are arranged at the middle position of the bottom surface of the top cover main body (21), and the outer side of the external detection port (23) is provided with a longitudinal track (24).

3. The power distribution transformer energy efficiency detection device of claim 2, wherein, The longitudinal track (24) comprises a connecting rod (241), both ends of the connecting rod (241) are fixedly connected with track rods (242), the inner side of the track rod (242) is provided with a longitudinal lead screw (243) through a bearing, the top surface and the bottom surface of the track rod (242) are provided with limiting grooves (244), the inner side of the track slide (52) is fixedly connected with limiting slides (54) matched with the limiting grooves (244) at the positions close to the limiting grooves (244), and the inner side of the track slide (52) is fixedly connected with ball nuts (53) matched with the longitudinal lead screw (243) at the positions close to the longitudinal lead screw (243).

4. The power distribution transformer energy efficiency detection device of claim 1, wherein, The shape of the cross section of the steel bar (563) is arc-shaped, first and second guide wheels (564) and (565) are arranged at the middle position of the side of the inner part of the track main body (561) close to the steel bar (563), and a moving groove matched with the steel bar (563) is arranged in the inner part of the track main body (561) along the track of the steel bar (563).

5. The power distribution transformer energy efficiency detection device of claim 1, wherein, The top surface of the mechanism body (571) is fixedly connected with an access terminal (572), which is used for being connected with a distribution transformer through a wire, the bottom of the access terminal (572) is connected with a connecting wire (578), one end of the connecting wire (578) away from the access terminal (572) is connected with a docking end (577) penetrating through the mechanism body (571), and the docking end (577) and the external detection port (23) are matched with each other.

6. The power distribution transformer energy efficiency detection device of claim 5, wherein, The bottom surface of the mechanism body (571) is fixedly connected with a fixed track (574) near the position of the docking end (577), the bottom surface of the fixed track (574) is nested with a transverse sliding rod (575), the bottom surface of the transverse sliding rod (575) is nested with a longitudinal sliding plate (576), the bottom surface of the longitudinal sliding plate (576) is fixedly connected with the top surface of the docking end (577), and the transverse sliding rod (575), the transverse sliding rod (575) and the mechanism body (571) are all connected with springs.

7. The power distribution transformer energy efficiency detection device of claim 5, wherein, The bottom end of the docking end (577) is fixedly connected with a magnet piece one, the top surface of the external detection port (23) is fixedly connected with a magnet piece two, and the magnetic poles of the bottom surface of the magnet piece one and the top surface of the magnet piece two are opposite.

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