Grid-connected box wiring fault detection equipment

Abstract

The invention discloses grid-connected box wiring fault detection equipment, and belongs to the technical field of grid-connected boxes. The detection device comprises a detection body and four detection lines, every two detection lines form a group, one end of each detection line is fixedly connected with a plug, the other end of each detection line is fixedly connected with a rotating plate, the end portion of each rotating plate is fixedly connected with a conductive clamp, and the inner side of each rotating plate is fixedly connected with a rotating ring. In the process of conducting wiring fixing detection on the grid-connected box, the conductive clamp is clamped and fixed to a wire of a detected object, detection operation is started through the detection body, during detection, the circular plate is rotated manually, then the conductive clamp and the wire move back and forth, and in the detection process, if reading fluctuation is large, the conductive clamp is not fixed to the wire if the reading fluctuation is large. If not, the connection between the wire and the detected object has a problem, and the problem is not the internal problem of the detected object, so that the detection operation between the wire and the detected object can be completed.

Description

Technical Field

[0001] The present invention relates to the technical field of grid-connected boxes, and in particular to a grid-connected box wiring fault detection device. Background Art

[0002] The grid connection box is an indispensable "gateway" device for the safe and reliable connection of distributed energy systems (photovoltaic, wind power, and energy storage) to the power grid. It is more than just a simple junction box; it is an intelligent distribution unit that integrates key functions such as safety isolation, multiple protections (especially anti-islanding), energy metering, and monitoring communications. Its structure is designed around achieving these core functions. The internal components work together to ensure that the power generation system operates under the premise of meeting the strict regulations of the power grid, protecting personnel and equipment safety and grid stability. During the use of the grid-connected box, wiring faults often occur due to various environmental factors (such as humidity, high temperature, etc.), long-term operation aging, external damage or animal infestation. In this case, it is necessary to use dedicated wiring fault detection equipment to gradually detect and locate the fault and make timely repairs. Traditional wiring fault detection equipment mainly uses the principle of DC constant current source plus four-wire Kelvin measurement method for detection. When performing the detection, first turn off the power of the instrument, then electrically connect the two ends of the detection line and the object to be detected, and then start the detection operation. The overall operation is simple; However, in the actual detection process, first, the entire device is in a fixed state, especially between the wires of the object to be detected and the object to be detected. When a fault occurs, it is very likely that the wires and the object to be detected are in a soft connection state. Sometimes, the wires are pulled manually, but this behavior is extremely dangerous. Second, when a wiring fault occurs, it may also be that there is a soft connection phenomenon inside the object to be detected. Third, when a fault occurs, it may also be because of long-term operation, causing the overall temperature of the device to rise, which is affected by the temperature and then a wiring fault occurs. Traditional wiring fault detection equipment can only detect whether there is a wiring fault, but cannot detect the specific cause. Subsequent investigation is required, which is time-consuming and labor-intensive, and the function is relatively single. Therefore, a grid-connected box wiring fault detection device is provided. Summary of the Invention

[0003] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a grid connection box fault detection device.

[0004] The present invention adopts the following technical solutions: The cam is fixedly provided with a toothed plate, and the toothed plate is fixedly provided with a toothed plate, and the toothed plate is fixedly provided with a toothed plate, and the toothed plate is fixedly provided with a toothed plate, and the toothed plate is fixedly provided with a toothed plate, and the toothed plate is fixedly provided with a toothed plate,

[0005] Preferably, both sides of the slider are fixedly connected to a first connecting rod, and the knocking assembly includes a first connecting rod fixedly installed on both sides of the slider, both ends of the first connecting rod are rotatably connected to a first connecting ring, the lower side of the first connecting ring is rotatably connected to the second connecting rod, the lower side of the second connecting rod is rotatably connected to the second connecting ring, the lower side of the second connecting ring is rotatably connected to a sliding rod, the sliding rod and the right-angle plate are slidably connected, the side wall of the sliding rod is fixedly connected to a support rod, the side wall of the right-angle plate is slidably connected to a connecting plate, the connecting plate is fixedly connected to a plurality of protrusions, and the lower side of the vertical plate is fixedly connected to a round rod.

[0006] Preferably, the right-angle plate is fixedly connected to a weight block, the weight block is slidably connected to two third connecting rods, the two third connecting rods are fixedly connected to a knocking ball, and the two third connecting rods are fixedly connected to the connecting plate.

[0007] Preferably, the rotating shaft is fixedly connected to a temperature simulator, and the rotating shaft is also fixedly connected to a gear, the gear is meshedly connected to a rack, and the rack is fixedly connected to the right-angle plate via a fourth connecting rod.

[0008] Preferably, the two conductive clips are arranged in a semi-conical shape, and the side walls of the two conductive clips are provided with a plurality of triangular grooves.

[0009] Preferably, a through hole is formed on the side wall of the right-angle plate, the circular plate rotates through the through hole, a right-angle groove is formed on the upper side of the through hole, and the slider slides through the right-angle groove.

[0010] Preferably, a mounting block is slidably connected to a side wall of the slider, a third spring is fixedly connected between the mounting block and the slider, and a fourth spring is fixedly connected between the mounting block and the vertical plate.

[0011] The beneficial effects of the present invention are: 1. First, when performing wiring fault detection on the grid-connected box, first clamp the conductive clip on the wire of the object to be detected, and start the detection operation through the detection body. During the detection, manually rotate the circular plate, causing the conductive clip and the wire to move back and forth. During the detection process, if the reading fluctuates greatly, it means that there is a problem with the connection between the wire and the object to be detected, and it is not a problem inside the object to be detected. Then, the detection operation between the wire and the object to be detected can be completed; 2. Secondly, during the inspection process, the slider that moves back and forth will drive the connecting plate to move upward under the action of the first connecting rod, the second connecting rod and other objects, causing the protrusions and the round rods to be staggered, and ultimately causing the wires and the round rods to move back and forth relative to the right-angle plate. The direction of this movement is different from that of the slider, and the two are perpendicular to each other. Therefore, the overall trajectory of the vertical plate is not a straight line, which can better form a pulling effect on the wire; 3. At the same time, the connecting plate that moves up and down will drive the beating ball to move up and down, forming a beating on the object being tested. During the testing process, if the test data fluctuates greatly, it means that there is a soft connection inside the object being tested. This can not only form a detection effect on the object, but also detect the cause of the fault of the object being tested, achieving multiple goals at one stroke; 4. Finally, during the detection process, the temperature simulator can be used to quickly make the space where the object being detected is located reach the temperature during long-term operation, thereby greatly reducing the detection time and making the detection results more accurate. In addition, during the detection process, when the rotating plate and the conductive clip move back and forth as a whole, the temperature simulator will rotate, which will cause the temperature near the wire to change. During the detection, if the reading changes greatly, it means that the device as a whole is greatly affected by the temperature, and the wiring fault may be caused by temperature changes. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a structural diagram of a grid-connected box wiring fault detection device proposed by the present invention; Figure 2 This is a connection diagram of the detection line and the rotating plate in the grid-connection box wiring fault detection device proposed by the present invention; Figure 3 This is a connection diagram of the rotating plate and the right-angle plate in a grid-connection box wiring fault detection device proposed by the present invention; Figure 4 This is a connection diagram of a rotating plate in a grid-connected box wiring fault detection device proposed by the present invention; Figure 5This is a connection diagram of another angle of the rotating plate and the right-angle plate in the grid-connection box wiring fault detection device proposed by the present invention; Figure 6 This is a schematic diagram of the connection of the right-angle plate in the grid-connection box wiring fault detection device proposed by the present invention; Figure 7 This is a connection diagram of the circular plate and the vertical plate in a grid-connection box wiring fault detection device proposed by the present invention; Figure 8 This is a connection diagram of the first connecting rod and the second connecting rod in a grid-connected box wiring fault detection device proposed by the present invention; Figure 9 This is a schematic diagram of the connection of the circular plate and the vertical plate at another angle in the grid-connected box wiring fault detection device proposed by the present invention; Figure 10 This is a schematic diagram of the connection of risers in a grid-connected box wiring fault detection device proposed by the present invention; Figure 11 The present invention provides a schematic cross-sectional connection diagram of a slider and a mounting block in a grid-connection box wiring fault detection device.

[0013] In the figure: 1 detection body, 2 rotating plate, 3 detection line, 4 right-angle plate, 5 conductive clip, 6 rotating shaft, 7 mounting rod, 8 first spring, 9 middle plate, 10 vertical plate, 11 gear, 12 temperature simulator, 13 rack, 14 fourth connecting rod, 15 weight block, 16 connecting plate, 17 protrusion, 18 square plate, 19 first connecting rod, 20 second connecting rod, 21 round rod, 22 third connecting rod, 23 knocking ball, 24 round plate, 25 second spring, 26 first connecting ring, 27 second connecting ring, 28 sliding rod, 29 support rod, 30 block, 31 slider, 32 third spring, 33 fourth spring, 34 mounting block. DETAILED DESCRIPTION

[0014] See Figures 1-11, a grid box wiring fault detection device, including a detection body 1 and four detection lines 3, two detection lines 3 form a group, one end of the detection line 3 is fixedly connected to a plug, the other end of the detection line 3 is fixedly connected to a rotating plate 2, the end of the rotating plate 2 is fixedly connected to a conductive clip 5, the rotating plate 2 has a conductive block connected to the detection line 3 inside, and the conductive block is connected to the conductive clip 5, the detection line 3 is electrically connected to the detection body 1, so when the measured wire is connected between the two conductive clips 5, a closed circuit can be formed, the inner side of the rotating plate 2 is fixedly connected to a rotating ring, and the rotating rings in the same group are connected to a rotating shaft 6 for common rotation, both ends of the rotating shaft 6 are fixedly connected to a fixed plate, the side wall of the fixed plate is fixedly connected to a mounting rod 7, and the side wall of the mounting rod 7 is fixedly connected to a vertical plate 10, two An intermediate plate 9 is fixedly connected between the mounting rods 7, a first spring 8 is fixedly connected between the intermediate plate 9 and the rotating plate 2, a slider 31 is slidably connected to the side wall of the vertical plate 10, a right-angle plate 4 is slidably connected to the side wall of the slider 31, a second spring 25 is fixedly connected between the right-angle plate 4 and the slider 31, the two conductive clips 5 are arranged in a semi-conical shape, and the side walls of the two conductive clips 5 are provided with a plurality of triangular grooves, which can better clamp the wires, the outer sides of the two rotating plates 2 are fixedly connected with pull rings, and the pull rings and the outer sides of the rotating plates 2 are sleeved with insulating rubber sleeves, the bottom of the detection body 1 is fixedly connected to a telescopic support frame, and the outer sides of the detection body 1 are fixedly connected to grip rods, and the height of the detection body 1 can be adjusted by the telescopic support frame, thereby facilitating the detection operation; First, the side wall of the detection body 1 is provided with four slots, and the four slots are matched with the four detection wires 3. When it is necessary to detect the wiring fault of the grid-connected box, the right-angle plate 4 is placed on the component to be detected inside the grid-connected box, and the conductive clip 5 and the wire on the component are opposite. First, the two rotating plates 2 are manually pressed, and the two rotating plates 2 are rotated around the rotating shaft 6 to move the two conductive clips 5 away from each other, so that the wire enters between the two conductive clips 5. The rotating plate 2 is released. Under the action of the first spring 8, the wire and the two conductive clips 5 are tightly against each other. First, a suitable test current is selected, and then the detection body 1 is started. After the reading tends to be stable, the data is recorded, and the wiring fault detection operation is completed. The above are all existing technologies and no unnecessary details are given. A control assembly for controlling the movement of the slider 31 is installed on the side wall of the right-angle plate 4. The control assembly includes a stopper 30 fixedly installed on the lower side of the slider 31. The side wall of the right-angle plate 4 is rotatably connected to the circular plate 24. The inner side of the circular plate 24 is fixedly connected to the square plate 18. The side wall of the slider 31 is slidably connected to the mounting block 34. A third spring 32 is fixedly connected between the mounting block 34 and the slider 31. A fourth spring 33 is fixedly connected between the mounting block 34 and the vertical plate 10. A through hole is opened on the side wall of the right-angle plate 4, and the circular plate 24 is rotatably installed in the through hole. A right-angle groove is opened on the upper side of the through hole, and the slider 31 slides through the right-angle groove. During the test, after the readings become stable and the data is recorded, the circular plate 24 is manually rotated back and forth, and the circular plate 24 drives the square plate 18 to rotate back and forth. During the rotation of the square plate 18, the square plate 18 and the stopper 30 are against each other, which drives the stopper 30 to move. Figure 8 From the perspective of , when the circular plate 24 rotates clockwise, the circular plate 24 drives the square plate 18 to rotate clockwise, the square plate 18 and the stop block 30 resist each other and drive the stop block 30 to move right, the stop block 30 drives the slider 31 to move right, the slider 31 causes the connected second spring 25 to deform, the slider 31 drives the vertical plate 10 to move right, the vertical plate 10 drives the first connecting rod 19 and the rotating shaft 6 to move right as a whole, the rotating shaft 6 drives the rotating plate 2 to move right, and the rotating plate 2 drives the conductive clip 5 and the wire to move right until the square plate 18 and the stop block 30 are disconnected, thereby causing the conductive clip 5 and the wire to move back and forth in this process, and when the circular plate 24 rotates counterclockwise, it also causes the conductive clip 5 and the wire to move back and forth. During the detection process, if the reading fluctuates greatly, it means that there is a problem with the connection between the wire and the object to be detected, and it is not a problem inside the object to be detected, and the detection operation between the wire and the object to be detected can be completed.

[0015] Both sides of the slider 31 are fixedly connected to the first connecting rod 19, both ends of the first connecting rod 19 are rotatably connected to the first connecting ring 26, the lower side of the first connecting ring 26 is rotatably connected to the second connecting rod 20, the lower side of the second connecting rod 20 is rotatably connected to the second connecting ring 27, the lower side of the second connecting ring 27 is rotatably connected to the sliding rod 28, the sliding rod 28 and the right-angle plate 4 are slidably connected, the side wall of the sliding rod 28 is fixedly connected to the support rod 29, the side wall of the right-angle plate 4 is slidably connected to the connecting plate 16, the connecting plate 16 is fixedly connected to a plurality of protrusions 17, the lower side of the vertical plate 10 is fixedly connected to the round rod 21, the right-angle plate 4 is fixedly connected to the weight block 15, the weight block 15 is slidably connected to two third connecting rods 22, the two third connecting rods 22 are fixedly connected to the knocking balls 23, and the two third connecting rods 22 are fixedly connected to the connecting plate 16; First, in the initial state, the knocking ball 23 and the object to be detected are against each other, and there is a certain distance between the support rod 29 and the connecting plate 16. Secondly, in the process of the slider 31 moving back and forth relative to the right-angle plate 4, the slider 31 will drive the first connecting rod 19 to move back and forth relative to the right-angle plate 4. Since the slide rod 28 and the right-angle plate 4 are connected by sliding up and down, the first connecting rod 19 will drive the slide rod 28 to move up and down through the first connecting ring 26, the second connecting rod 20 and the second connecting ring 27. The slide rod 28 drives the support rod 29 to move up and down. The support rod 29 and the connecting plate 16 are against each other, driving the connecting plate 16, the third connecting rod 22 and the knocking ball 23 to move upward, and the knocking ball 23 and the object to be detected are disconnected until the support rod 29 and the connecting plate 16 are disconnected. At this time, the knocking ball 23 and the object to be detected are disconnected. The offset of the components will form a knocking effect on the object being tested. During the testing process, if the test data fluctuates greatly, it means that there is a soft connection inside the object being tested. It can not only form a detection effect on the object, but also detect the cause of the fault of the object being tested, killing two birds with one stone. During the long-term use of the grid-connected box, the internal components of the grid-connected box will often become loose due to aging and other reasons, and the wires will be close to each other, forming a soft connection state. The knocking of the knocking head can make the object being tested vibrate. If there is a soft connection state between the wires, this connection state can be amplified under the influence of vibration, resulting in obvious data changes during the testing process. Ultimately, it can be determined whether the internal aging of the object to be tested is the cause of the wiring fault. As the connecting plate 16 moves up and down, the connecting plate 16 drives the protrusion 17 to move up and down. After the protrusion 17 and the round rod 21 are in an interlaced form, the protrusion 17 on the outside of the connecting plate 16 will form an obstruction effect on the round rod 21 that moves following the vertical plate 10. Under the dual action of the round rod 21, the protrusion 17 and the third spring 32, the vertical plate 10 and the round rod 21 will move back and forth as a whole relative to the right-angle plate 4, thereby causing the wire and the round rod 21 to move back and forth relative to the right-angle plate 4, and this movement direction is different from the movement direction of the slider 31, and the two are in a vertical form, so the overall trajectory of the vertical plate 10 will not be a straight line, thereby better forming a pulling effect on the wire.

[0016] A temperature simulator 12 is fixedly connected to the lower side of the rotating shaft 6, and a gear 11 is also fixedly connected to the outer side of the rotating shaft 6. A rack 13 is meshedly connected to the outer side of the gear 11. The rack 13 is fixedly connected to the right-angle plate 4 through a fourth connecting rod 14; First, the temperature simulator 12 includes a temperature generator, a temperature sensor, a controller, etc., wherein the temperature generator (such as "hot fast") can provide high-temperature gas and spray the high-temperature gas toward the wire. The temperature sensor can detect the temperature of the air in this area and transmit this signal to the detection body 1. The detection body 1 can receive this signal and start the controller to adjust the high-temperature gas generated by the temperature generator so that the temperature of this area is always within a suitable range. During the detection process, the high-temperature gas generated allows the space where the wire and the object to be detected are located to quickly reach the temperature during long-term work, thereby greatly reducing the detection time and making the detection results more accurate. In the detection process, when the rotating plate 2 and the conductive clip 5 move back and forth as a whole, the temperature simulator 12 will rotate, which will cause the temperature near the wire to change. During the detection, if the reading changes greatly, it means that the device as a whole is greatly affected by the temperature, and the wiring fault may be caused by temperature change.

[0017] In the present invention, when it is necessary to detect a wiring fault in the grid-connected box, the right-angle plate 4 is placed on the component to be detected inside the grid-connected box, and the two rotating plates 2 are manually pressed to allow the wire to enter between the two conductive clips 5. The rotating plates 2 are released, and the wire and the two conductive clips 5 are tightly against each other. A suitable test current is selected, and then the detection body 1 is started. After the reading tends to be stable, the data is recorded, and the wiring fault detection operation is completed. The above are all existing technologies and no redundant description is given. During the test, after the readings become stable and the data is recorded, the circular plate 24 is manually rotated back and forth, and the circular plate 24 drives the square plate 18 to rotate back and forth. When the square plate 18 and the stopper 30 are against each other, the stopper 30 is driven to move. Figure 8 From the perspective of , when the circular plate 24 rotates clockwise, the circular plate 24 drives the square plate 18 to rotate clockwise, the square plate 18 and the stopper 30 resist each other and drive the stopper 30 to move right, the stopper 30 drives the slider 31 and the vertical plate 10 to move right, the vertical plate 10 drives the first connecting rod 19 and the rotating shaft 6 to move right as a whole, and the rotating shaft 6 drives the rotating plate 2, the conductive clip 5 and the wire to move right, until the square plate 18 and the stopper 30 are disconnected, thereby causing the conductive clip 5 and the wire to move back and forth during this process, and when the circular plate 24 rotates counterclockwise, it also causes the conductive clip 5 and the wire to move back and forth. During the detection process, if the reading fluctuates greatly, it means that there is a problem with the connection between the wire and the object to be detected, and it is not a problem inside the object to be detected, and the detection operation between the wire and the object to be detected can be completed; During the process of the slider 31 moving back and forth relative to the right-angle plate 4, the slider 31 will drive the first connecting rod 19 to move back and forth relative to the right-angle plate 4, and the first connecting rod 19 will drive the sliding rod 28 to move up and down through the first connecting ring 26, the second connecting rod 20 and the second connecting ring 27, and the sliding rod 28 drives the support rod 29 to move up and down, and the support rod 29 and the connecting plate 16 are abutted against each other to drive the connecting plate 16, the third connecting rod 22 and the knocking ball 23 to move upward, and the knocking ball 23 and the object to be detected are disconnected until the support rod 29 and the connecting plate 16 are disconnected. At this time, the knocking ball 23 and the object to be detected are abutted against each other, which will form a knocking effect on the object to be detected. During the detection process, if the detection data fluctuates greatly, it means that there is a soft connection inside the object to be detected; When the connecting plate 16 moves up and down, the connecting plate 16 drives the protrusion 17 to move up and down. After the protrusion 17 and the round rod 21 are in a staggered shape, the vertical plate 10 and the round rod 21 will move back and forth relative to the right-angle plate 4 as a whole. The wire and the round rod 21 move back and forth relative to the right-angle plate 4. The direction of this movement is different from the direction of movement of the slider 31, and the two are in a perpendicular shape. Therefore, the overall trajectory of the vertical plate 10 is not a straight line, which can better form a pulling effect on the wire. During the detection process, the high-temperature gas generated allows the space where the wires and the object being detected are located to quickly reach the temperature of long-term work, thereby greatly reducing the detection time and making the detection results more accurate. In addition, during the detection process, when the rotating plate 2 and the conductive clip 5 move back and forth as a whole, the temperature simulator 12 will rotate, which will cause the temperature near the wire to change. During the detection, if the reading changes greatly, it means that the device as a whole is greatly affected by the temperature, and the wiring fault may be caused by temperature changes.

Claims

1. A grid-connected box wiring fault detection device, comprising a detection body (1) and four detection lines (3), characterized in that: The two detection lines (3) form a group, the detection lines (3) are fixedly connected to a plug, the detection lines (3) are fixedly connected to a rotating plate (2), the rotating plate (2) is fixedly connected to a conductive clip (5), the rotating plate (2) is fixedly connected to a rotating ring, the rotating ring is rotatably connected to a rotating shaft (6), the rotating shaft (6) is fixedly connected to a fixed plate, the fixed plate is fixedly connected to a mounting rod (7), the mounting rod (7) is fixedly connected to a vertical plate (10), an intermediate plate (9) is fixedly connected between the two mounting rods (7), and the intermediate plate (9) A first spring (8) is fixedly connected between the vertical plate (10) and the rotating plate (2); the vertical plate (10) is slidably connected to a slider (31); the slider (31) is slidably connected to a right-angle plate (4); a second spring (25) is fixedly connected between the right-angle plate (4) and the slider (31); the right-angle plate (4) is equipped with a control assembly for controlling the movement of the slider (31); the control assembly includes a stopper (30) fixedly installed on the lower side of the slider (31); the right-angle plate (4) is rotatably connected to a circular plate (24); and the circular plate (24) is fixedly connected to a square plate (18).

2. A grid-connected box wiring fault detection device according to claim 1, characterized in that: Both sides of the slider (31) are fixedly connected to a first connecting rod (19), the first connecting rod (19) is rotatably connected to a first connecting ring (26), the first connecting ring (26) is rotatably connected to a second connecting rod (20), the second connecting rod (20) is rotatably connected to a second connecting ring (27), the second connecting ring (27) is rotatably connected to a sliding rod (28), the sliding rod (28) and the right-angle plate (4) are slidably connected, the sliding rod (28) is fixedly connected to a support rod (29), the side wall of the right-angle plate (4) is slidably connected to a connecting plate (16), the connecting plate (16) is fixedly connected to a plurality of protrusions (17), and the lower side of the vertical plate (10) is fixedly connected to a round rod (21).

3. A grid-connected box wiring fault detection device according to claim 2, characterized in that: The right-angle plate (4) is fixedly connected to a weight block (15), the weight block (15) is slidably connected to two third connecting rods (22), the two third connecting rods (22) are fixedly connected to a knocking ball (23), and the two third connecting rods (22) are fixedly connected to the connecting plate (16).

4. A grid-connected box wiring fault detection device according to claim 3, characterized in that: The rotating shaft (6) is fixedly connected to a temperature simulator (12), and the rotating shaft (6) is also fixedly connected to a gear (11). The gear (11) is meshedly connected to a rack (13), and the rack (13) is fixedly connected to the right-angle plate (4) via a fourth connecting rod (14).

5. The grid-connected box wiring fault detection device according to claim 1, characterized in that: The two conductive clips (5) are arranged in a semi-conical shape, and the side walls of the two conductive clips (5) are provided with a plurality of triangular grooves.

6. A grid-connection box wiring fault detection device according to claim 1, characterized in that: A through hole is provided on the side wall of the right-angle plate (4), the circular plate (24) rotates through the through hole, a right-angle groove is provided on the upper side of the through hole, and the slider (31) slides through the right-angle groove.

7. The grid-connection box wiring fault detection device according to claim 1, characterized in that: The side wall of the slider (31) is slidably connected to a mounting block (34), a third spring (32) is fixedly connected between the mounting block (34) and the slider (31), and a fourth spring (33) is fixedly connected between the mounting block (34) and the vertical plate (10).

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