Charging pile heat dissipation structure with adjustable air inlet rate

Abstract

The charging pile heat dissipation structure comprises a charging pile body, a heat dissipation assembly is arranged on one side of the charging pile body, an air inlet adjusting frame is fixedly connected to the other side of the charging pile body, and an adjusting assembly is rotationally connected to one end of the interior of the air inlet adjusting frame; a plurality of louver blade rods are rotationally connected to one side of the joint of the adjusting assembly and the air inlet adjusting frame, two worm plates are fixedly connected to one end of one side of the air inlet adjusting frame, a worm assembly is rotationally connected between the two worm plates, and an adjuster assembly is arranged on one side of the joint of the two worm plates and the charging pile body. A mounting groove is formed in one side of the inner wall of the charging pile body, a filter screen assembly is arranged in the mounting groove, and four limiting mechanisms used for limiting the filter screen assembly are arranged on the outer side, connected with the charging pile body, of the mounting groove. The maintenance frequency of the filter screen is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicle charging, and specifically to a heat dissipation structure for a charging pile with adjustable air intake volume. Background Technique

[0002] With the rapid development of new energy technologies, electric vehicles are increasingly widely used in daily life, which has led to an increasing demand for electric vehicle charging piles. Some charging piles are installed in locations with canopies or indoors. During the charging process of electric vehicles, a large amount of heat is generated by power components, electronic modules, etc. inside the charging pile. If this heat cannot be dissipated in a timely and effective manner, it will cause the internal temperature of the charging pile to be too high, which will in turn affect the performance, lifespan, and even safety of the charging pile. Therefore, it is necessary to dissipate heat inside the charging pile. The heat dissipation structures of existing charging piles generally cooperate with a cooling fan and an air inlet. The cooling fan at one end draws air from the outside, and the outside air enters the inside of the charging pile for heat exchange, and then is discharged through the air outlet to achieve heat dissipation inside the charging pile. However, the above common heat dissipation structures of charging piles still have deficiencies:

[0003] The traditional air inlet is provided with louvers at a fixed angle. The non-adjustable louvers have a small opening angle in summer, and the air intake volume is insufficient. It is necessary to increase the power of the cooling fan for heat dissipation, but the heat dissipation effect is not ideal due to the hot weather. In winter, the outside air is cooler, and a large louver opening is not required, which will increase the adhesion of dust to the filter screen, increase the maintenance frequency of the filter screen, and increase the maintenance cost. Summary of the Invention

[0004] The purpose of the present invention is to provide a heat dissipation structure for a charging pile with adjustable air intake volume, so as to solve the problem proposed in the above background technique that the traditional air inlet is provided with louvers at a fixed angle. The non-adjustable louvers have a small opening angle in summer, and the air intake volume is insufficient. It is necessary to increase the power of the cooling fan for heat dissipation, but the heat dissipation effect is not ideal due to the hot weather. In winter, the outside air is cooler, and a large louver opening is not required, which will increase the adhesion of dust to the filter screen, increase the maintenance frequency of the filter screen, and increase the maintenance cost.

[0005] To achieve the above object, the present invention provides the following technical solution: A charging pile heat dissipation structure with adjustable air intake volume, including a charging pile body, a heat dissipation component is arranged on one side of the charging pile body, an air intake adjustment frame is fixedly connected to the other side of the charging pile body, one end inside the air intake adjustment frame is rotatably connected with an adjustment component, and a plurality of louver rods are rotatably connected to one side of the connection between the adjustment component and the air intake adjustment frame. One end of one side of the air intake adjustment frame is fixedly connected with two worm plates, a worm component is rotatably connected between the two worm plates, and a regulator component is arranged on one side of the connection between the two worm plates and the charging pile body. An installation groove is opened on one side of the inner wall of the charging pile body, a filter component is arranged inside the installation groove, and four limiting mechanisms for limiting the filter component are arranged on the outer side of the connection between the installation groove and the charging pile body.

[0006] Preferably, an air intake opening is opened in the middle of one side of the charging pile body, an air outlet is opened in the middle of the other side of the charging pile body, and a rear cover plate is arranged on the back of the charging pile body.

[0007] Preferably, the heat dissipation component includes a heat dissipation support plate, the heat dissipation support plate is installed inside the air outlet, a plurality of air passing grooves are opened on the surface of the heat dissipation support plate, and a plurality of heat dissipation fans are fixedly installed on one side of the heat dissipation support plate, which is beneficial to the heat dissipation of the internal components of the charging pile.

[0008] Preferably, the adjustment component includes an adjustment louver rod, one end of the surface of the adjustment louver rod is fixedly connected with an adjustment worm gear, one side of the connection between the adjustment worm gear and the adjustment louver rod is fixedly connected with an adjustment belt pulley, and one side of the adjustment worm gear is fixedly connected with an adjustment gear, which can save energy and reduce the maintenance frequency of the filter screen.

[0009] Preferably, one end of the surface of the louver rod is fixedly connected with a first belt pulley, one side of the connection between the first belt pulley and the louver rod is fixedly connected with a second belt pulley, and transmission belts are connected between adjacent two first belt pulleys and adjacent two second belt pulleys.

[0010] Preferably, the worm component includes a transmission worm, one end of the transmission worm is fixedly connected with an adjustment handle, and one side of the transmission worm is meshed with one side of the adjustment worm gear.

[0011] Preferably, the regulator component includes a thyristor speed regulator, the thyristor speed regulator is fixedly installed on the air intake adjustment frame, a speed regulator gear is sleeved on the control end of the thyristor speed regulator, one side of the speed regulator gear is meshed with one side of the adjustment gear, and a plurality of heat dissipation fans are electrically connected to an external power supply through the thyristor speed regulator, which is beneficial to automatically adjusting the power of the heat dissipation fans according to the angle of the louvers.

[0012] Preferably, the filter assembly includes a filter frame, which is arranged inside the mounting groove. A dustproof filter is arranged inside the filter frame, and a magnetic bar is arranged on one side of the dustproof filter. A silicone layer is arranged on the surface of the magnetic bar, which is helpful in preventing external dust from entering.

[0013] Preferably, a metal sheet is fixedly connected to the interior of the mounting groove, and the surface of the silicone layer is in contact with and connected to the surface of the metal sheet.

[0014] The cam is fixedly provided with a first hook plate on one side of the support block, and the second hook plate is fixedly provided with a first hook plate on the other side of the support block, and the cam is fixedly provided with a first hook plate on the other side of the support block.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: the driving worm is driven to rotate by rotating the handle, so that the adjusting louver rod is rotated, and the other louver rods are rotated at the same time by the pulley and the transmission belt, so that the angle of the louver can be adjusted. In summer, the angle of the louver can be fully opened manually. While adjusting the rotation of the louver rod, the thyristor speed regulator is turned up to increase the power of the cooling fan, which can ensure the heat dissipation effect, protect various components inside the charging pile, and improve the safety of the charging pile. In winter, because the outside air is colder, the opening can be adjusted smaller, and the thyristor speed regulator is turned down to reduce the power of the cooling fan. Under the condition of ensuring heat dissipation, energy can be saved and the maintenance frequency of the filter can be reduced.

[0016] When the blinds are fully open, the filter needs more maintenance. The filter is installed by connecting with a strong magnet, and the surface of the strong magnet is provided with a silicone layer, which can prevent dust from entering as much as possible. A limiting mechanism is also provided to prevent the filter from falling off. However, the limiting mechanism will not affect the convenience of disassembly of the filter. This installation method facilitates the disassembly and maintenance of the filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a front structural diagram of the heat dissipation structure of a charging pile with adjustable air inlet volume according to the present invention;

[0018] Figure 2Side structure diagram of the charging pile heat dissipation structure with adjustable air intake for the present invention;

[0019] Figure 3 Another side structure diagram of the charging pile heat dissipation structure with adjustable air intake for the present invention;

[0020] Figure 4 Partial enlarged structure diagram A of the charging pile heat dissipation structure with adjustable air intake for the present invention;

[0021] Figure 5 Structure diagram of the adjustment component of the charging pile heat dissipation structure with adjustable air intake for the present invention;

[0022] Figure 6 Structure diagram of the louver component of the charging pile heat dissipation structure with adjustable air intake for the present invention;

[0023] Figure 7 Structure diagram of the heat dissipation component of the charging pile heat dissipation structure with adjustable air intake for the present invention;

[0024] Figure 8 Internal structure diagram of the charging pile heat dissipation structure with adjustable air intake for the present invention;

[0025] Figure 9 Partial enlarged structure diagram B of the charging pile heat dissipation structure with adjustable air intake for the present invention;

[0026] Figure 10 Structure diagram of the filter component of the charging pile heat dissipation structure with adjustable air intake for the present invention;

[0027] Figure 11 Structure diagram of the charging pile body of the charging pile heat dissipation structure with adjustable air intake for the present invention.

[0028] In the figure: 1. Charging pile body; 2. Air inlet; 3. Air outlet; 4. Heat dissipation support plate; 5. Air passing groove; 6. Heat dissipation fan; 7. Air intake adjustment frame; 8. Adjustment louver rod; 9. Adjustment worm gear; 10. Adjustment gear; 11. Silicon controlled speed regulator; 12. Speed regulator gear; 13. Adjustment belt pulley; 14. Worm plate; 15. Driving worm; 16. Adjustment handle; 17. Louver blade rod; 18. First belt pulley; 19. Second belt pulley; 20. Transmission belt; 21. Rear cover plate; 22. Installation groove; 23. Metal sheet; 24. Filter frame; 25. Dust-proof filter screen; 26. Magnet strip; 27. Silicone layer; 28. Anti-detachment block; 29. Limit support plate; 30. Grooved slider; 31. Perforated support block; 32. Sliding pressure plate; 33. Arc-shaped convex block; 34. Limit round rod; 35. Push-pull block; 36. Return spring; 37. First hook plate; 38. Intercepting groove block; 39. Second hook plate. Detailed implementation manners

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention.

[0030] Please refer to Figures 1-11 , the present invention provides a charging pile heat dissipation structure with adjustable air intake volume, including a charging pile body 1. A heat dissipation component is arranged on one side of the charging pile body 1. The other side of the charging pile body 1 is fixedly connected with an air intake adjustment frame 7. One end inside the air intake adjustment frame 7 is rotatably connected with an adjustment component. One side of the connection between the adjustment component and the air intake adjustment frame 7 is rotatably connected with a plurality of louver rods 17. One end of one side of the air intake adjustment frame 7 is fixedly connected with two worm plates 14. A worm component is rotatably connected between the two worm plates 14. One side of the connection between the two worm plates 14 and the charging pile body 1 is provided with a regulator component. An installation groove 22 is opened on one side of the inner wall of the charging pile body 1. A filter component is arranged inside the installation groove 22. Four limiting mechanisms for limiting the filter component are arranged on the outer side of the connection between the installation groove 22 and the charging pile body 1.

[0031] Refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 , further, an air inlet 2 is opened in the middle of one side of the charging pile body 1, an air outlet 3 is opened in the middle of the other side of the charging pile body 1, a rear cover plate 21 is arranged on the back of the charging pile body 1. The heat dissipation component includes a heat dissipation support plate 4. The heat dissipation support plate 4 is installed inside the air outlet 3. A plurality of air passing grooves 5 are opened on the surface of the heat dissipation support plate 4. A plurality of heat dissipation fans 6 are fixedly installed on one side of the heat dissipation support plate 4. The adjustment component includes an adjustment louver rod 8. One end of the surface of the adjustment louver rod 8 is fixedly connected with an adjustment worm gear 9. One side of the connection between the adjustment worm gear 9 and the adjustment louver rod 8 is fixedly connected with an adjustment belt pulley 13. One side of the adjustment worm gear 9 is fixedly connected with an adjustment gear 10. One end of the surface of the louver rod 17 is fixedly connected with a first belt pulley 18. One side of the connection between the first belt pulley 18 and the louver rod 17 is fixedly connected with a second belt pulley 19. Transmission belts 20 are respectively connected between adjacent two first belt pulleys 18 and adjacent two second belt pulleys 19. The worm component includes a transmission worm 15. One end of the transmission worm 15 is fixedly connected with an adjustment handle 16. One side of the transmission worm 15 is meshed with one side of the adjustment worm gear 9. The regulator component includes a silicon controlled speed regulator 11. The silicon controlled speed regulator 11 is fixedly installed on the air intake adjustment frame 7. A speed regulator gear 12 is sleeved on the control end of the silicon controlled speed regulator 11. One side of the speed regulator gear 12 is meshed with one side of the adjustment gear 10. A plurality of heat dissipation fans 6 are all electrically connected with an external power supply through the silicon controlled speed regulator 11;

[0032] In use, when adjustment is required, manually rotate the adjustment handle 16 to drive the transmission worm 15 to rotate. The rotation of the transmission worm 15 drives the adjustment worm gear 9 to rotate. The worm and worm gear have the characteristic of self-locking, and can be fixed at the adjusted angle after the angle of the louver is adjusted. The rotation of the adjustment worm gear 9 causes the adjustment louver rod 8 to rotate. The adjustment louver rod 8 is the first louver of the air inlet adjustment frame 7 and is different from the other louvers, while the other louvers are the same. An adjustment pulley 13 is provided on the adjustment louver rod 8, and a transmission belt 20 is connected between the adjustment pulley 13 and the first pulley 18 on the louver blade rod 17 below the adjustment louver rod 8. Transmission belts 20 are connected between the remaining first pulleys 18 and second pulleys 19. When the adjustment louver rod 8 rotates, under the action of the pulleys and belts, the remaining louver blade rods 17 rotate synchronously. Although the number of louver blade rods 17 is large, due to their light own weight, the adjustment is relatively convenient. An adjustment gear 10 is provided on the adjustment gear 10. The thyristor speed regulator 11 is a device that uses thyristors as power control elements and changes the output voltage or current by adjusting its conduction angle to achieve the adjustment of the motor speed. There is a rotating knob on the panel of the traditional thyristor speed regulator 11, which can achieve stepless speed regulation. A speed regulator gear 12 is fixedly connected to the rotating knob, and this speed regulator gear 12 is meshed with the adjustment gear 10. Therefore, when the adjustment gear 10 rotates, the speed regulator gear 12 rotates and at the same time rotates the rotating knob on the thyristor speed regulator 11 to adjust the output power of the radiator fan 6.

[0033] Refer to Figure 8 、 Figure 9 、 Figure 10 and Figure 11, Further, the filter assembly includes a filter frame 24 disposed inside the installation groove 22. A dust filter screen 25 is provided inside the filter frame 24. A magnet strip 26 is provided on one side of the dust filter screen 25. A silicone layer 27 is provided on the surface of the magnet strip 26. A metal sheet 23 is fixedly connected inside the installation groove 22. The surface of the silicone layer 27 is in contact connection with the surface of the metal sheet 23. The limiting mechanism includes a limiting support plate 29 fixedly connected to the charging pile body 1. A grooved slider 30 and a perforated support block 31 are fixedly connected to the surface of the limiting support plate 29. A sliding pressure plate 32 is slidably connected inside the grooved slider 30. A limiting round rod 34 is slidably connected inside the perforated support block 31. One end of the limiting round rod 34 is fixedly connected to one end of the sliding pressure plate 32. An arc-shaped convex block 33 is fixedly connected to one end on one side of the sliding pressure plate 32. A push-pull block 35 is fixedly connected to the other end of the limiting round rod 34. A return spring 36 is fixedly connected between the perforated support block 31 and the push-pull block 35. A first hook plate 37 is fixedly connected to one side of the perforated support block 31. An intercepting groove block 38 is fixedly connected to one end of the surface of the limiting support plate 29. A second hook plate 39 is slidably connected inside the intercepting groove block 38. An anti-detachment block 28 is fixedly connected to one end of the second hook plate 39;

[0034] During use, place the side of the filter frame 24 with the magnet strip 26 into the installation groove 22. There is a relatively thin silicone layer 27 on the surface of the magnet strip 26, and the silicone layer 27 has little influence on the adsorption force of the magnet strip 26. Therefore, after the magnet strip 26 contacts the metal sheet 23, the filter frame 24 is adsorbed inside the installation groove 22 by magnetic force. The charging pile body 1 has a certain wall thickness at this position to install the filter frame 24. After installation, under the extrusion of the adsorption force of the magnet strip 26, the silicone layer 27 can minimize the entry of dust into the charging pile body 1. At this time, the initial position of the sliding pressure plate 32 on the limiting support plate 29 does not interfere with the installation of the filter frame 24. Then move the sliding pressure plate 32 in the direction close to the filter frame 24. After the filter frame 24 is installed, it will slightly protrude above the installation groove 22. At this time, the arc-shaped convex block 33 will press on the filter frame 24 to limit it. At this time, the return spring 36 is in a compressed state. Then move the second hook plate 39 to hook the first hook plate 37 and the second hook plate 39 together to ensure that the sliding pressure plate 32 in other directions does not fall off during use and ensure the stable use of the limiting mechanism. After the first hook plate 37 and the second hook plate 39 are hooked together, it can prevent the sliding pressure plate 32 from resetting under the action of the return spring 36, and the first hook plate 37 and the second hook plate 39 restrict each other to ensure the limitation of the sliding pressure plate 32 on the filter frame 24.

[0035] When the embodiment of the present application is in use: In summer, the weather is relatively hot, and the heat dissipation intensity inside the charging pile body 1 needs to be increased. At this time, we can rotate the adjustment handle 16 to make the air inlet 2 at the maximum angle. When adjusting the air inlet 2, the adjustment louver rod 8 rotates to make the adjustment gear 10 rotate, and the adjustment gear 10 rotates to make the speed governor gear 12 rotate. At this time, the thyristor speed governor 11 rotates to increase the power of the cooling fan 6, ensuring the heat dissipation requirements of the charging pile body 1. At this time, the number of times of maintaining and cleaning the dust-proof filter screen 25 that intercepts external dust increases. With the dust-proof filter screen 25 that can be conveniently disassembled, it is very convenient to maintain and clean the dust-proof filter screen 25. When cleaning, check whether the silicone layer 27 is damaged, wipe the silicone layer 27 clean to ensure the sealing performance, and the limiting mechanism can be released in the same way, which is very convenient. In winter, the external temperature is relatively low, and the inside of the charging pile body 1 does not require a strong heat dissipation effect. At this time, rotate the adjustment handle 16 to make the air inlet 2 smaller. At the same time, the speed governor gear 12 rotates to make the control knob of the thyristor speed governor 11 rotate. At this time, the power of the cooling fan 6 is reduced, which can reduce the power of the cooling fan 6, save energy, and because the air inlet 2 is smaller, the amount of dust inhaled is reduced, and the amount of dust intercepted by the dust-proof filter screen 25 is reduced, which can also reduce the number of times of maintaining and cleaning the dust-proof filter screen 25 and reduce costs. It should be noted that the present invention is a charging pile heat dissipation structure with adjustable air intake volume. The components are all common standard parts or parts known to those skilled in the art. Its structure and principle can be known to those skilled in the art through technical manuals or obtained through conventional experimental methods. At the idle place of this device, all the above-mentioned electrical components, which refer to power elements, electrical components, and the adapted monitoring computer and power supply, are connected through wires. For the specific connection means, reference should be made to the above working principle to complete the electrical connection according to the sequence of operation of each electrical component. The detailed connection means are well-known techniques in the art.

[0036] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A heat dissipation structure for a charging pile with adjustable air intake volume, comprising a charging pile body (1), characterized in that: On one side of the charging pile body (1), a heat dissipation component is provided. On the other side of the charging pile body (1), an air inlet adjusting frame (7) is fixedly connected. At one end inside the air inlet adjusting frame (7), an adjusting component is rotatably connected. On one side of the connection between the adjusting component and the air inlet adjusting frame (7), a plurality of louver rods (17) are rotatably connected. At one end of one side of the air inlet adjusting frame (7), two worm plates (14) are fixedly connected. Between the two worm plates (14), a worm component is rotatably connected. On one side of the connection between the two worm plates (14) and the charging pile body (1), a regulator component is provided. On one side of the inner wall of the charging pile body (1), an installation groove (22) is opened. Inside the installation groove (22), a filter component is provided. On the outer side of the connection between the installation groove (22) and the charging pile body (1), four limiting mechanisms for limiting the filter component are provided.

2. The heat dissipation structure of a charging pile with adjustable air intake according to claim 1, characterized in that: In the middle of one side of the charging pile body (1), an air inlet (2) is opened. In the middle of the other side of the charging pile body (1), an air outlet (3) is opened. On the back of the charging pile body (1), a rear cover plate (21) is provided.

3. The heat dissipation structure of a charging pile with adjustable air intake according to claim 2, wherein: The heat dissipation component includes a heat dissipation support plate (4). The heat dissipation support plate (4) is installed inside the air outlet (3). On the surface of the heat dissipation support plate (4), a plurality of air passing grooves (5) are opened. On one side of the heat dissipation support plate (4), a plurality of heat dissipation fans (6) are fixedly installed.

4. The heat dissipation structure of a charging pile with adjustable air intake according to claim 3, wherein: The adjusting component includes an adjusting louver rod (8). At one end of the surface of the adjusting louver rod (8), an adjusting worm gear (9) is fixedly connected. On one side of the connection between the adjusting worm gear (9) and the adjusting louver rod (8), an adjusting belt pulley (13) is fixedly connected. On one side of the adjusting worm gear (9), an adjusting gear (10) is fixedly connected.

5. The heat dissipation structure of a charging pile with adjustable air intake according to claim 1, characterized in that: At one end of the surface of the louver rod (17), a first belt pulley (18) is fixedly connected. On one side of the connection between the first belt pulley (18) and the louver rod (17), a second belt pulley (19) is fixedly connected. Between adjacent two first belt pulleys (18) and between adjacent two second belt pulleys (19), a transmission belt (20) is in transmission connection.

6. The heat dissipation structure of a charging pile with adjustable air intake according to claim 4, wherein: The worm component includes a transmission worm (15). At one end of the transmission worm (15), an adjusting handle (16) is fixedly connected. On one side of the transmission worm (15), it is meshed and connected with one side of the adjusting worm gear (9).

7. The heat dissipation structure of a charging pile with adjustable air intake according to claim 4, wherein: The regulator component includes a thyristor speed regulator (11). The thyristor speed regulator (11) is fixedly installed on the air inlet adjusting frame (7). A speed regulator gear (12) is sleeved on the control end of the thyristor speed regulator (11). On one side of the speed regulator gear (12), it is meshed and connected with one side of the adjusting gear (10). A plurality of heat dissipation fans (6) are all electrically connected with an external power supply through the thyristor speed regulator (11).

8. The heat dissipation structure of a charging pile with adjustable air intake according to claim 1, characterized in that: The filter component includes a filter frame (24). The filter frame (24) is arranged inside the installation groove (22). Inside the filter frame (24), a dust-proof filter screen (25) is provided. On one side of the dust-proof filter screen (25), a magnet strip (26) is provided. On the surface of the magnet strip (26), a silica gel layer (27) is provided.

9. The heat dissipation structure of a charging pile with adjustable air intake according to claim 8, wherein: A metal sheet (23) is fixedly connected inside the installation groove (22), and the surface of the silica gel layer (27) is in contact connection with the surface of the metal sheet (23).

10. The heat dissipation structure of a charging pile with adjustable air intake according to claim 1, characterized in that: The limiting mechanism includes a limiting support plate (29) fixedly connected to the charging pile body (1). A grooved slider (30) and a perforated support block (31) are fixedly connected to the surface of the limiting support plate (29). A sliding pressure plate (32) is slidably connected inside the grooved slider (30). A limiting round rod (34) is slidably connected inside the perforated support block (31). One end of the limiting round rod (34) is fixedly connected to one end of the sliding pressure plate (32). An arc-shaped convex block (33) is fixedly connected to one end on one side of the sliding pressure plate (32). A push-pull block (35) is fixedly connected to the other end of the limiting round rod (34). A return spring (36) is fixedly connected between the perforated support block (31) and the push-pull block (35). A first hook plate (37) is fixedly connected to one side of the perforated support block (31). An intercepting groove block (38) is fixedly connected to one end of the surface of the limiting support plate (29). A second hook plate (39) is slidably connected inside the intercepting groove block (38). An anti-disengagement block (28) is fixedly connected to one end of the second hook plate (39).

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