Vehicle-mounted domain control liquid cooling plate

Abstract

The invention relates to the technical field of vehicle-mounted liquid cooling plates, in particular to a vehicle-mounted domain control liquid cooling plate which comprises a base plate and a plate cover arranged at the top of the base plate, a modularized liquid cooling mechanism used for cooling and heat dissipation is installed on the inner side of the base plate, and a locking mechanism used for synchronously fixing the plate cover and the liquid cooling mechanism to the base plate is arranged at the bottom of the plate cover. The liquid cooling mechanism comprises a bottom plate arranged on the inner side of the substrate and a plurality of fins fixed to the top of the bottom plate at equal intervals, a plurality of lower liquid cooling pipes distributed at equal intervals are arranged at the top of the bottom plate, and upper liquid cooling pipes are arranged at the tops of the lower liquid cooling pipes respectively. When the liquid cooling pipe leaks, the whole liquid cooling pipe does not need to be replaced, waste caused by replacing the whole liquid cooling pipe is reduced, the maintenance cost is reduced, the practicability of the domain control liquid cooling plate is improved, meanwhile, the situation that the liquid cooling plate is damaged due to the fact that the liquid cooling plate is corroded by leaked cooling liquid can be avoided, and the service life of the liquid cooling plate is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle-mounted liquid cooling plates, and in particular to a vehicle-mounted domain control liquid cooling plate. Background Art

[0002] The on-board domain control liquid cooling plate mainly realizes heat dissipation and cooling of automotive electronic components through liquid circulation. In order to ensure that the electronic components are used at an appropriate temperature, the domain control liquid cooling plate is used for cooling. The liquid cooling tubes on the current liquid cooling plate are usually embedded in the substrate, but the tube wall at the bend of the liquid cooling tube is usually thinner, and leakage may occur after long-term use. Once a leak occurs, the entire liquid cooling tube needs to be replaced, which will cause a great waste and increase cost expenditure. The leaked coolant may also corrode the liquid cooling plate, causing damage to the liquid cooling plate and shortening the service life of the entire liquid cooling plate. Summary of the invention

[0003] In order to overcome the deficiencies of the prior art, the present invention provides a vehicle-mounted domain control liquid cooling plate, which solves the problem in the prior art that the entire liquid cooling pipe needs to be replaced due to leakage, resulting in waste.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0005] A vehicle-mounted domain control liquid cooling plate, comprising a base plate and a plate cover arranged on the top of the base plate, wherein a modular liquid cooling mechanism for cooling and dissipating heat is installed on the inner side of the base plate, and a locking mechanism for synchronously fixing the base plate and the liquid cooling mechanism to the base plate is arranged at the bottom of the plate cover, wherein the liquid cooling mechanism comprises a bottom plate arranged on the inner side of the base plate, and a plurality of equidistantly arranged fins fixed to the top of the base plate, a plurality of equidistantly distributed lower liquid cooling tubes are arranged on the top of the base plate, upper liquid cooling tubes are respectively arranged on the tops of the plurality of lower liquid cooling tubes, and the lower liquid cooling tubes and the upper liquid cooling tubes respectively penetrate the fins and match them, a liquid inlet pipe and a liquid outlet pipe are respectively arranged on both sides of the base plate, and one end of the liquid inlet pipe penetrates the base plate and is fixed to the upper liquid cooling tube near the edge, one end of the liquid outlet pipe penetrates the base plate and is fixed to the lower liquid cooling tube near the edge, one end of the adjacent lower liquid cooling tube and the upper liquid cooling tube are sealed and plugged with connecting elbows, and a limiting component for limiting the positions of the plurality of connecting elbows at both ends of the top of the base plate is also arranged at the bottom of the plate cover.

[0006] As a further optimization scheme of the present invention, the locking mechanism includes limit stops fixedly arranged at the four corners of the bottom plate, and positioning blocks respectively arranged at the four corners of the inner side of the base plate and matching the limit stops, a movable plug rod fixed to the plate cover is arranged between the limit stop block and the positioning block, limit slots are respectively provided on both sides of the bottom of the movable plug rod, and limit slide grooves are respectively provided on one side of the limit stop block and the positioning block, and movable blocks are respectively slidably arranged on the inner sides of the two limit slide grooves, one end of the two movable blocks are respectively matched with the limit slots, and matching inclined surfaces are respectively provided on both sides of the bottom of the movable plug rod and one end of the two movable blocks, and reset springs fixed to the limit stop block and the positioning block are respectively fixed at one end of the two movable blocks, and the locking mechanism also includes a moving component arranged on the base plate for synchronously pulling the two movable blocks to move to both ends respectively.

[0007] As a further optimization scheme of the present invention, the movable component includes positioning grooves respectively opened at both ends of the bottom of the base plate, and a movable pull rod movably arranged in the positioning groove, connecting pull rods are respectively fixed at both ends of the movable pull rod, and movable cross bars are respectively fixedly arranged on one side of the two movable blocks, and the connecting pull rod passes through one side of the base plate and is fixedly connected to one of the movable cross bars, a limiting cross frame fixed to the base plate is arranged on one side of the bottom of the movable insertion rod, and one end of the two movable cross bars slides inside the limiting cross frame, a transmission gear is arranged between the two movable cross bars, and a rotating vertical shaft that rotates with the base plate through a bearing is fixedly arranged at the axis center of the transmission gear, and movable racks arranged in an alternating manner are respectively meshed on both sides of the transmission gear, and one end of the two movable racks are respectively fixedly connected to the two movable cross bars.

[0008] As a further optimization scheme of the present invention, the limit assembly includes limit baffles which are slidably arranged at the two ends of the bottom of the plate cover, and one side of the limit baffle is in contact with the connecting bent pipe. Limit grooves with triangular cross-sections are respectively opened at both ends of one side of the limit baffle, and a clamping block is slidably arranged on the limit groove. The side surface of the clamping block matches the side wall of the limit groove, and a clamping spring fixed to the side wall of the substrate is fixed on the inner side of the clamping block.

[0009] By means of the above technical solution, the present invention provides a vehicle-mounted domain control liquid cooling plate, which has at least the following beneficial effects compared with the prior art:

[0010] 1. The present invention circulates the coolant through a liquid cooling mechanism to reduce the temperature. The entire cooling pipe is composed of a liquid inlet pipe, a liquid outlet pipe, a plurality of lower night cooling pipes, an upper liquid cooling pipe and a plurality of connecting elbows. When a connecting elbow leaks, the corresponding connecting elbow can be replaced alone without replacing the entire liquid cooling pipe, thereby reducing the waste caused by replacing the entire liquid cooling pipe, reducing maintenance costs, and improving the practicality of the domain control liquid cooling plate. At the same time, it also avoids the situation where the leaked coolant corrodes the liquid cooling plate and causes damage to the liquid cooling plate, thereby extending the service life of the liquid cooling plate.

[0011] 2. The present invention sets a limit assembly to limit the position of several connecting elbows at the same time, further fixes the connecting elbows between the lower night cooling tube and the upper liquid cooling tube, and also provides positioning for the entire liquid cooling mechanism, so that the liquid cooling plate is more stable when in use, and is more convenient when disassembled, which is convenient for regular inspection and maintenance, thereby reducing maintenance costs and difficulty and facilitating use.

[0012] 3. The present invention fixes the plate cover and the liquid cooling mechanism on the base plate synchronously by setting a locking mechanism. When the plate cover is closed, the movable rod is inserted between the limit stop block and the positioning block, so that the movable rod and the limit stop block are fixed to the positioning block in the base plate, so that the bottom plate is fixed in the base, which is more convenient for installing the liquid cooling plate and improves the stability of the liquid cooling mechanism.

[0013] 4. The present invention can simultaneously pull the two movable blocks out of the limit slots on both sides of the bottom of the movable plug rod by arranging a movable component, so that the movable plug rod is not clamped, and the plate cover can be removed from the base plate, so that the liquid cooling mechanism in the base plate can be inspected and maintained, the operation is more convenient, the inconvenience of maintenance personnel is reduced, and the practicality of the liquid cooling plate is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0016] Figure 2 It is a side perspective cross-sectional view of the present invention;

[0017] Figure 3 It is a schematic diagram of the internal structure of the present invention;

[0018] Figure 4 It is a partial front view of the liquid cooling mechanism of the present invention;

[0019] Figure 5 It is a partial exploded view of the locking mechanism of the present invention;

[0020] Figure 6 It is a partial exploded view of the mobile assembly of the present invention;

[0021] Figure 7 for Figure 2 Schematic diagram of the enlarged structure of part A.

[0022] In the figure: 1, base plate; 2, plate cover;

[0023] 3. Liquid cooling mechanism; 31. Bottom plate; 32. Fins; 33. Lower liquid cooling pipe; 34. Upper liquid cooling pipe; 35. Liquid inlet pipe; 36. Liquid outlet pipe; 37. Connecting elbow pipe;

[0024] 38, limit assembly; 381, limit baffle; 382, ​​limit slot; 383, tightening block; 384, tightening spring;

[0025] 4. Locking mechanism; 41. Limit stopper; 42. Positioning block; 43. Movable plug rod; 44. Limit slide groove; 45. Movable clamping block; 46. Reset spring;

[0026] 47. Moving assembly; 471. Movable pull rod; 472. Connecting pull rod; 473. Movable cross bar; 474. Limiting cross frame; 475. Transmission gear; 476. Rotating vertical axis; 477. Movable rack. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] First embodiment

[0029] With the popularity of intelligent driving, the number of electronic components in cars is gradually increasing. For electronic components that work continuously, domain-controlled liquid cooling plates are needed to cool the electronic components to ensure that the electronic components are used at an appropriate temperature. Since the bending part of the liquid cooling tube of the existing domain-controlled liquid cooling plate has a thin tube wall, it is easy to leak after long-term use, which will affect the cooling effect of the liquid cooling plate and shorten the service life of the liquid cooling plate. The entire liquid cooling tube needs to be replaced, which causes waste. In order to avoid the waste caused by the leakage of the liquid cooling tube, the entire liquid cooling tube needs to be replaced to reduce maintenance costs. Figure 1 - Figure 4 and Figure 7The present embodiment provides a vehicle-mounted domain control liquid cooling plate, which is composed of a substrate 1 provided with a cavity, a plate cover 2 and a liquid cooling mechanism 3. The liquid cooling mechanism 3 is arranged on the inner side of the substrate 1 to provide cooling and heat dissipation for automotive electronic components. The plate cover 2 is arranged on the top of the substrate 1 to provide a certain degree of protection for the liquid cooling mechanism 3.

[0030] In order to reduce the waste caused by replacing the entire liquid cooling tube, and at the same time avoid the leakage of coolant corroding the liquid cooling plate and causing damage to the liquid cooling plate, thereby extending the service life of the liquid cooling plate, the liquid cooling mechanism 3 includes a bottom plate 31 arranged on the inner side of the base plate 1, and a plurality of equidistantly arranged fins 32 fixed to the top of the bottom plate 31, a plurality of equidistantly distributed lower liquid cooling tubes 33 are arranged on the top of the plurality of lower liquid cooling tubes 33, upper liquid cooling tubes 34 are respectively arranged on the top of the plurality of lower liquid cooling tubes 33, and the lower liquid cooling tubes 33 and the upper liquid cooling tubes 34 respectively penetrate the fins 32 and match them, and a liquid inlet pipe 35 and a liquid outlet pipe 36 are respectively arranged on both sides of the base plate 1, and the liquid inlet pipe 35 is provided with a plurality of equidistantly distributed lower liquid cooling tubes 33. One end passes through the substrate 1 and is fixed to the upper liquid-cooling tube 34 near the edge, and one end of the liquid outlet tube 36 passes through the substrate 1 and is fixed to the lower liquid-cooling tube 33 near the edge. The liquid inlet tube 35 and the liquid outlet tube 36 are respectively provided with movable limiting vertical bars. When it is necessary to disassemble the liquid inlet tube 35 or the liquid outlet tube 36, the limiting vertical bar can be directly taken out. One end of the adjacent lower liquid-cooling tube 33 and the upper liquid-cooling tube 34 is sealed and plugged with a connecting elbow 37. Several lower liquid-cooling tubes 33 and upper liquid-cooling tubes 34 are divided into two layers, and the lower liquid-cooling tubes 33 and the upper liquid-cooling tubes 34 are staggered, so that the connecting elbow 37 is in an inclined state, which is conducive to more stable circulation of the coolant and also improves the heat dissipation performance.

[0031] When the connecting elbow 37 of the liquid cooling plate leaks after long-term use, the plate cover 2 can be removed and the corresponding connecting elbow 37 can be replaced separately. At the same time, if the lower night cooling pipe and the upper liquid cooling pipe 34 are blocked, they can also be removed and cleaned to ensure the smooth circulation of the coolant and improve the cooling effect of the liquid cooling plate.

[0032] Second embodiment

[0033] In order to facilitate regular inspection and maintenance and reduce maintenance costs and difficulties, refer to Figure 3In this embodiment, a limiting component 38 for limiting the positions of several connecting elbows 37 at the top two ends of the bottom plate 31 is further provided at the bottom of the plate cover 2. The specific implementation method is that the limiting component 38 includes limiting baffles 381 slidably arranged at the two ends of the bottom of the plate cover 2, and one side of the limiting baffle 381 is in contact with the connecting elbow 37, and limiting grooves 382 with triangular cross-sections are respectively provided at both ends of one side of the limiting baffle 381. A tightening block 383 is slidably arranged on the limiting groove 382, ​​and the side surface of the tightening block 383 matches with a side wall of the limiting groove 382. A tightening spring 384 fixed to the side wall of the substrate 1 is fixed to the inner side of the tightening block 383.

[0034] When the plate cover 2 is covered on the upper substrate 1, the limiting baffles 381 at the two ends of the bottom of the plate cover 2 are respectively inserted into the two sides of the substrate 1, and the position of the tightening block 383 matches the position of the limiting groove 382. When the limiting baffle 381 moves downward, it pushes the tightening block 383 to move in the horizontal direction. The tightening block 383 squeezes the tightening spring 384, and the tightening spring 384 produces elastic deformation and is compressed. The reaction force generated by the tightening spring 384 pushes the limiting baffle 381 to contact the connecting bend 37 through the tightening block 383, so as to position the connecting bend 37 and improve the sealing and stability of the connecting bend 37 and the lower liquid cooling tube 33 and the upper liquid cooling tube 34 at its two ends.

[0035] Third embodiment

[0036] In order to make the installation of the liquid cooling plate more convenient, the stability of the liquid cooling mechanism 3 is improved. Figure 5 - Figure 6In this embodiment, a locking mechanism 4 for synchronously fixing the plate cover 2 and the liquid cooling mechanism 3 on the base plate 1 is provided at the bottom of the plate cover 2. The specific implementation method is that the locking mechanism 4 includes limit blocks 41 fixedly arranged at the four corners of the base plate 31, and positioning blocks 42 respectively arranged at the four corners of the inner side of the base plate 1 and matching the limit blocks 41. A movable plug rod 43 fixed to the plate cover 2 is provided between the limit blocks 41 and the positioning blocks 42. Limiting card grooves are respectively provided on both sides of the bottom of the movable plug rod 43. Limiting sliding grooves 44 are respectively provided on one side of the limit blocks 41 and the positioning blocks 42. Active card blocks 45 are respectively slidably provided on the inner sides of the two limit sliding grooves 44. One end of the two active card blocks 45 is respectively engaged with the limit The slots match each other, and matching inclined surfaces are provided on both sides of the bottom of the movable rod 43 and one end of the two movable blocks 45 respectively. One end of the two movable blocks 45 is respectively fixed with a return spring 46 fixed to the limit stopper 41 and the positioning block 42. When the movable rod 43 moves downward, the movable rod 43 pushes the two movable blocks 45 to move horizontally to both ends respectively, and the movable blocks 45 squeeze the return springs 46. The return springs 46 produce elastic deformation and are compressed. When the movable rod 43 is fully inserted, the movable block 45 matches the limit slot, and the return spring 46 restores the elastic deformation, pushing the movable block 45 into the limit slot, and the movable rod 43 and the limit stopper 41 are fixed to the positioning block 42 through the movable block 45.

[0037] Furthermore, in order to reduce the inconvenience of maintenance personnel and improve the practicality of the liquid cooling plate, a moving assembly 47 for synchronously pulling the two movable blocks 45 to move to both ends is provided on the base plate 1, and the moving assembly 47 includes positioning grooves respectively opened at both ends of the bottom of the base plate 1, and a movable pull rod 471 movably arranged in the positioning groove, and connecting rods 472 are respectively fixed at both ends of the movable pull rod 471, and one side of the two movable blocks 45 is respectively fixed with a movable cross bar 473, and the connecting rod 472 passes through one side of the base plate 1 and is fixed to one of the movable cross bars 473. A limit horizontal frame 474 fixed to the base plate 1 is provided on one side of the bottom of the movable plug rod 43, and one end of the two movable cross bars 473 slides inside the limit horizontal frame 474, so that the two movable cross bars 473 are more stable when moving, and a transmission gear 475 is provided between the two movable cross bars 473, and a rotating vertical shaft 476 that rotates with the base plate 1 through a bearing is fixedly provided at the axis center of the transmission gear 475, and staggered movable racks 477 are respectively meshed on both sides of the transmission gear 475, and one end of the two movable racks 477 are respectively fixedly connected to the two movable cross bars 473.

[0038] When the liquid cooling plate needs to be repaired, the two movable rods 471 are pulled at the same time, and the movable rods 471 respectively drive the connecting rods 472 at both ends to move, and the connecting rods 472 drive the movable cross bar 473 at one end to move, and the movable cross bar 473 drives the movable rack 477 to move, and the movable rack 477 drives the transmission gear 475 meshing with it to rotate, and the transmission gear 475 drives another movable rack 477 to move, so that the two movable racks 477 move in opposite directions, and the two movable clamping blocks 45 are respectively driven to move by the two movable cross bars 473, and the two movable clamping blocks 45 are respectively moved out of the two limit slots, so that the movable plug rod 43 is not clamped, and the plate cover 2 is removed, and the liquid cooling plate can be repaired.

[0039] During use of the present invention, the substrate 1 is attached to the electronic component, and the heat generated by the operation of the electronic component enters the substrate 1. The cooling liquid is transported from the liquid inlet pipe 35 to the upper liquid cooling pipe 34 closest to the edge through the external pump body, and the cooling liquid is sent to the lower liquid cooling pipe 33 through the connecting elbow 37, so that the cooling liquid is transported to the liquid outlet pipe 36 through a plurality of upper liquid cooling pipes 34, connecting elbows 37 and lower liquid cooling pipes 33. The cooling liquid takes away the heat on the inner side of the substrate 1, and the temperature is lowered after the heat is dissipated, and then it is sent back to the liquid inlet pipe 35 through the pump body to form a closed-loop system, thereby continuously cooling the temperature.

[0040] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A vehicle-mounted domain control liquid cooling plate, comprising a base plate (1) and a plate cover (2) arranged on the top of the base plate (1), characterized in that: A modular liquid cooling mechanism (3) for cooling and dissipating heat is installed on the inner side of the base plate (1), and a locking mechanism (4) for synchronously fixing the plate cover (2) and the liquid cooling mechanism (3) on the base plate (1) is provided at the bottom of the plate cover (2); The liquid cooling mechanism (3) comprises a bottom plate (31) arranged on the inner side of the base plate (1), and a plurality of equidistantly arranged fins (32) fixed on the top of the bottom plate (31), a plurality of equidistantly distributed lower liquid cooling tubes (33) are arranged on the top of the bottom plate (31), upper liquid cooling tubes (34) are arranged on the tops of the plurality of lower liquid cooling tubes (33), and the lower liquid cooling tubes (33) and the upper liquid cooling tubes (34) respectively penetrate the fins (32) and match them, and liquid inlet tubes are respectively arranged on both sides of the base plate (1). The base plate (31) is provided with a liquid inlet pipe (35) and a liquid outlet pipe (36), and one end of the liquid inlet pipe (35) passes through the base plate (1) and is fixed to the upper liquid cooling pipe (34) near the edge, one end of the liquid outlet pipe (36) passes through the base plate (1) and is fixed to the lower liquid cooling pipe (33) near the edge, and one end of the adjacent lower liquid cooling pipe (33) and upper liquid cooling pipe (34) is sealed and plugged with a connecting elbow pipe (37), and the bottom of the plate cover (2) is also provided with a limit assembly (38) for limiting the position of a plurality of connecting elbow pipes (37) at the two ends of the top of the base plate (31).

2. The vehicle-mounted domain control liquid cooling plate according to claim 1, characterized in that: The locking mechanism (4) comprises limit blocks (41) respectively fixedly arranged at four corners of the bottom plate (31), and positioning blocks (42) respectively arranged at four corners inside the base plate (1) and matching with the limit blocks (41); a movable plug rod (43) fixed to the plate cover (2) is arranged between the limit blocks (41) and the positioning blocks (42); limit slots are respectively arranged on both sides of the bottom of the movable plug rod (43); limit slide grooves (44) are respectively arranged on one side of the limit blocks (41) and the positioning block (42); movable blocks (45) are respectively slidably arranged inside the two limit slide grooves (44); the locking mechanism (4) further comprises a moving assembly (47) arranged on the base plate (1) for synchronously pulling the two movable blocks (45) to move respectively to two ends.

3. The vehicle-mounted domain control liquid cooling plate according to claim 2, characterized in that: One end of the two movable clamping blocks (45) is matched with the limit clamping groove, and the two sides of the bottom of the movable plug rod (43) and one end of the two movable clamping blocks (45) are respectively provided with matching inclined surfaces, and one end of the two movable clamping blocks (45) is respectively fixed with a return spring (46) fixed to the limit stopper (41) and the positioning block (42).

4. The vehicle-mounted domain control liquid cooling plate according to claim 2, characterized in that: The movable assembly (47) comprises positioning grooves respectively provided at two ends of the bottom of the base plate (1), and a movable pull rod (471) movably arranged in the positioning groove, and connecting pull rods (472) are respectively fixed at two ends of the movable pull rod (471), and movable cross bars (473) are respectively fixedly arranged on one side of the two movable clamping blocks (45), and the connecting pull rod (472) passes through one side of the base plate (1) and is fixedly connected to one of the movable cross bars (473).

5. The vehicle-mounted domain control liquid cooling plate according to claim 4, characterized in that: A limiting horizontal frame (474) fixed to the base plate (1) is provided on one side of the bottom of the movable insertion rod (43), and one end of the two movable horizontal bars (473) slides inside the limiting horizontal frame (474), and a transmission gear (475) is provided between the two movable horizontal bars (473).

6. The vehicle-mounted domain control liquid cooling plate according to claim 5, characterized in that: A rotating vertical shaft (476) is fixedly arranged at the axis of the transmission gear (475) and rotates with the base plate (1) through a bearing. Staggered movable racks (477) are respectively meshed on both sides of the transmission gear (475), and one end of the two movable racks (477) is respectively fixedly connected to the two movable cross bars (473).

7. The vehicle-mounted domain control liquid cooling plate according to claim 1, characterized in that: The limiting assembly (38) comprises limiting baffles (381) slidably arranged at the two ends of the bottom of the plate cover (2), and one side of the limiting baffle (381) is in contact with the connecting elbow (37), and limiting grooves (382) with triangular cross-sections are respectively opened at the two ends of one side of the limiting baffle (381), and a tightening block (383) is slidably arranged on the limiting groove (382).

8. The vehicle-mounted domain control liquid cooling plate according to claim 7, characterized in that: The side surface of the pressing block (383) matches a side wall of the limiting groove (382), and a pressing spring (384) fixed to the side wall of the base plate (1) is fixed on the inner side of the pressing block (383).

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