A robot heat dissipation structure

By using a motor-driven bevel gear set and a dustproof mesh design, the problem of dust entering the robot's heat dissipation structure is solved, achieving efficient heat dissipation and stable equipment operation, and extending service life.

CN224334490UActive Publication Date: 2026-06-09CHENGDU AEROSPACE KAITE ELECTROMECHANICAL TECH CO LTD

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
CHENGDU AEROSPACE KAITE ELECTROMECHANICAL TECH CO LTD
Filing Date
2025-07-24
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

During use, dust can easily enter the ventilation openings of a robot's heat dissipation structure, leading to short circuits, component oxidation and aging, shortening its lifespan. Furthermore, dust adhering to the fan blades increases operating resistance, increases noise, and weakens the heat dissipation effect.

Method used

A robot heat dissipation structure was designed, which uses a motor-driven bevel gear set to drive a rotating plate to open and close the ventilation opening. Combined with a dustproof net and liquid cooling system, it ensures that dust does not enter, and automatically closes when the machine stops for protection. Electric push rods and clamps are used to achieve quick and easy installation.

Benefits of technology

It effectively blocks external dust, improves heat dissipation, extends equipment life, reduces wear, ensures stable operation, and improves assembly efficiency and installation stability.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN224334490U_ABST
    Figure CN224334490U_ABST
Patent Text Reader

Abstract

This utility model relates to the field of robotics technology and discloses a robot heat dissipation structure, including a heat dissipation shell. Two ventilation windows are fixedly connected to the front side of the heat dissipation shell. A motor is fixedly connected inside the two ventilation windows. A drive wheel is fixedly connected to the drive end of the motor. A belt is fitted around the outside of the drive wheel. A driven wheel is rotatably connected to the other end of the belt. A rotating shaft is rotatably connected inside the driven wheel. Multiple bevel gears are fixedly connected to the outside of the rotating shaft. Multiple rotating rods are rotatably connected inside the ventilation windows. Each of the rotating rods has a bevel gear fixedly connected to its top. In this utility model, the motor drives the belt to rotate the driven wheel. Through the rotation shaft and bevel gear set, the opening and closing of the rotating plate is controlled. During operation, the blades unfold to ensure heat dissipation; when stopped, they close to block dust and prevent a decrease in heat dissipation efficiency and component wear.
Need to check novelty before this filing date? Find Prior Art

Description

Technical Field

[0001] This utility model relates to the field of robot technology, and in particular to a robot heat dissipation structure. Background Technology

[0002] The purpose of a robot's heat dissipation structure is to maintain the internal components within a suitable temperature range. By efficiently dissipating heat generated by circuit modules, motors, and other components, it prevents components from aging, degrading, or burning out due to high temperatures, ensuring the robot's continuous and stable operation. Simultaneously, a stable temperature environment reduces the impact of thermal stress on the mechanical structure, extending the equipment's lifespan. Under complex working conditions, the heat dissipation structure can prevent program malfunctions or functional failures caused by localized overheating, ensuring the detection accuracy and computational efficiency of precision components such as sensors and processors—a crucial guarantee for the robot's reliable operation.

[0003] Robot cooling systems primarily dissipate heat through components such as heat sinks, fans, and liquid cooling pipes. Heat sinks are often made of aluminum alloy or copper, increasing surface area to accelerate heat conduction. Fans provide forced convection, quickly removing heat, while liquid cooling systems utilize circulating coolant to transfer heat from core components to the cooling end. Some outdoor robots also incorporate ventilation channels to enhance heat dissipation in conjunction with natural wind. These structures are optimized for the robot's power and operating environment to ensure components operate at suitable temperatures.

[0004] In existing technologies, dust can enter the ventilation openings of robot heat dissipation structures during use. Dust accumulation can cause short circuits, accelerate component oxidation and aging, and shorten the robot's lifespan. At the same time, dust adhering to the fan blades increases operating resistance, leading to increased fan noise, decreased fan speed, and weakened heat dissipation. Therefore, a robot heat dissipation structure is proposed to solve the above problems. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a robot heat dissipation structure, which aims to improve the existing robot heat dissipation structure. During use, dust can enter the ventilation opening, and the accumulation of dust can cause short circuits, accelerate the oxidation and aging of components, and shorten the robot's service life. At the same time, dust adhering to the fan blades will increase the operating resistance, resulting in increased fan noise, decreased fan speed, and weakened heat dissipation effect.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A robot heat dissipation structure includes a heat dissipation shell. Two ventilation windows are fixedly connected to the front side of the heat dissipation shell. A motor is fixedly connected inside the two ventilation windows. A drive wheel is fixedly connected to the drive end of the motor. A belt is sleeved on the outside of the drive wheel. A driven wheel is rotatably connected to the other end of the belt. A rotating shaft is rotatably connected inside the driven wheel. Multiple bevel gears are fixedly connected to the outside of the rotating shaft. Multiple rotating rods are rotatably connected inside the ventilation windows. A bevel gear is fixedly connected to the top of each of the multiple rotating rods. The outside of the bevel gears is meshed with the outside of the bevel gears. A rotating plate is fixedly connected to the outside of each of the multiple rotating rods. An installation assembly for mounting the heat dissipation structure is provided on the outside of the heat dissipation shell.

[0008] As a further description of the above technical solution:

[0009] The mounting assembly includes two L-shaped blocks. The adjacent sides of the two L-shaped blocks are fixedly connected to the outside of the heat sink. Protective covers are fixedly connected to the front sides of both L-shaped blocks. Electric push rods are fixedly connected to the front sides of both L-shaped blocks. A rotating block is fixedly connected to the drive end of each electric push rod. A connecting rod is rotatably connected to the front side of each rotating block. A fixed block is rotatably connected to the other end of the connecting rod. A linkage rod is rotatably connected to the top of each rotating block. A connecting block is rotatably connected to the other end of the linkage rod. A clamping block is fixedly connected to the top of the connecting block. An mounting block is installed inside the clamping block. Two slide rails are slidably connected to the rear side of the clamping block.

[0010] As a further description of the above technical solution:

[0011] The outer side of the rotating shaft is rotatably connected to the inside of the ventilation window, and the upper and lower ends of the rotating plate are rotatably connected to the inner side of the ventilation window.

[0012] As a further description of the above technical solution:

[0013] The heat sink housing has two dustproof meshes fixedly connected inside, and a bracket fixedly connected inside.

[0014] As a further description of the above technical solution:

[0015] A fan is fixedly connected to the top of the bracket, and a ventilation duct is fixedly connected to the rear side of the fan.

[0016] As a further description of the above technical solution:

[0017] The front side of the ventilation duct is fixedly connected to the rear side of the upper dustproof net, and the front side of the ventilation duct is fixedly connected to the inside of the heat dissipation shell;

[0018] As a further description of the above technical solution:

[0019] Fins are fixedly connected inside the heat sink, and two heat dissipation pipes are fixedly connected inside the fins. The outer sides of the two heat dissipation pipes are fixedly connected inside the heat sink.

[0020] As a further description of the above technical solution:

[0021] A liquid cooling plate is fixedly connected to the top of the fins, a condenser tube is fixedly connected inside the liquid cooling plate, and the outside of the condenser tube is fixedly connected to the inside of the heat dissipation shell.

[0022] As a further description of the above technical solution:

[0023] The rear side of the fixing block is fixedly connected to the front side of the L-shaped block, and the outer side of the mounting block is slidably connected to the interior of the L-shaped block.

[0024] As a further description of the above technical solution:

[0025] The rear sides of the two slide rails are fixedly connected to the front side of the L-shaped block, and the rear side of the clamping block is slidably connected to the front side of the L-shaped block.

[0026] This utility model has the following beneficial effects:

[0027] 1. In this utility model, the motor drives the drive wheel and the belt to rotate the driven wheel. The driven wheel transmits power to the bevel gear set through the rotating shaft. The first bevel gear meshes with the second bevel gear for transmission. Finally, the rotating rod drives the rotating plate to realize the opening and closing action. When the equipment is running, the blades unfold to form a heat dissipation channel to ensure efficient heat dissipation. When the machine stops, the blades automatically close to form a sealed protective structure to prevent external dust and impurities from entering. This avoids the problem of reduced heat dissipation performance and wear of key components caused by dust accumulation, thereby improving the reliability and service life of the equipment.

[0028] 2. In this utility model, after the mounting block is pushed into the groove of the L-shaped block, the electric push rod is activated to drive the rotating block to move, which in turn drives the connecting rod to rotate around the fixed block. At the same time, the linkage rod pushes the clamping block to slide along the slide rail to clamp the mounting block through the connecting block, thereby achieving rapid fixation of the heat dissipation shell, improving assembly efficiency, reducing installation adjustment and contact risks, ensuring precise alignment of the heat dissipation components with the robot body, and enhancing installation stability. Attached Figure Description

[0029] Figure 1 This is a three-dimensional schematic diagram of a robot heat dissipation structure proposed in this utility model;

[0030] Figure 2 This is a schematic diagram of the heat dissipation pipe of a robot heat dissipation structure proposed in this utility model;

[0031] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0032] Figure 4 This is a schematic diagram of the connecting rod of a robot heat dissipation structure proposed in this utility model.

[0033] Legend:

[0034] 1. Heat sink housing; 2. Ventilation window; 3. Motor; 4. Drive wheel; 5. Belt; 6. Driven wheel; 7. Shaft; 8. Bevel gear one; 9. Bevel gear two; 10. Rotating rod; 11. Rotating plate; 12. L-shaped block; 13. Protective cover; 14. Electric push rod; 15. Rotating block; 16. Connecting rod; 17. Fixing block; 18. Linkage rod; 19. Connecting block; 20. Clamping block; 21. Slide rail; 22. Mounting block; 23. Dustproof net; 24. Bracket; 25. Fan; 26. Ventilation duct; 27. Fins; 28. Heat sink; 29. ​​Liquid cooling plate; 30. Condensation pipe. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0036] Reference Figures 1 to 3 This utility model provides an embodiment of a robot heat dissipation structure, including a heat dissipation shell 1. The heat dissipation shell 1 serves as the basic framework of the entire heat dissipation structure, providing space for the installation and support of other components and protecting internal components. Two ventilation windows 2 are fixedly connected to the front side of the heat dissipation shell 1. The ventilation windows 2 are channels for air exchange between the heat dissipation shell 1 and the external environment, providing installation space for internal and drive components, and controlling the ventilation volume by changing their opening and closing states, directly affecting the heat dissipation efficiency.

[0037] Two ventilation windows 2 are internally connected to motors 3, which provide power output to the ventilation mechanism. By driving the operation of subsequent transmission components, precise control of the ventilation area of ​​the ventilation windows 2 is achieved. A drive wheel 4 is fixedly connected to the drive end of the motor 3. A belt 5 is fitted on the outer side of the drive wheel 4. The other end of the belt 5 is rotatably connected to a driven wheel 6. The drive wheel 4, belt 5, and driven wheel 6 together constitute the power transmission process, transmitting the rotational power of the motor 3 from the drive wheel 4 through the belt 5 to the driven wheel 6, realizing long-distance power transmission and stable speed transmission.

[0038] A rotating shaft 7 is rotatably connected inside the driven wheel 6. Driven by the driven wheel 6, the rotating shaft 7 transmits power to the outer bevel gear 8, serving as the connection between the driven wheel 6 and the bevel gear transmission mechanism. Multiple bevel gears 8 are fixedly connected to the outer side of the rotating shaft 7. Multiple rotating rods 10 are rotatably connected inside the ventilation window 2. Driven by a second bevel gear 9, the rotating rods 10 rotate, thereby actuating the rotating plate 11. Each rotating rod 10 has a fixedly connected bevel gear 9 at its top. The outer side of the second bevel gear 9 meshes with the outer side of the first bevel gear 8. The first bevel gear 8 and the second bevel gear 9 form a vertical power steering mechanism. When the first bevel gear 8 rotates with the rotating shaft 7, it drives the second bevel gear 9 to change its rotation direction through meshing transmission, converting horizontal power into vertical power.

[0039] Multiple rotating rods 10 are fixedly connected to rotating plates 11 on their outer sides. The rotating plates 11 change the cross-sectional area of ​​the ventilation channel inside the ventilation window 2 by their own rotation, directly controlling the airflow. At the same time, they close after work to prevent dust from entering the mechanism. The outer side of the heat dissipation shell 1 is provided with mounting components for installing the heat dissipation structure.

[0040] Reference Figure 1 , Figure 2 , Figure 4 The mounting assembly includes two L-shaped blocks 12, with their adjacent sides fixedly connected to the outside of the heat sink 1. The L-shaped blocks 12 provide a stable mounting platform for other components of the mounting assembly, and their structure adapts to the corresponding mounting position on the robot, acting as a bridge connecting the heat sink 1 and the robot. Protective covers 13 are fixedly connected to the front of each L-shaped block 12. These covers isolate internal transmission components such as the electric push rod 14 from the external environment, preventing damage from dust, debris, or collisions.

[0041] Electric push rods 14 are fixedly connected to the front sides of both L-shaped blocks 12. The electric push rods 14 are the power source for the mounting components. They provide driving force through their extension and retraction, driving the subsequent transmission components to move, thereby realizing the position adjustment of the clamping block 20 and providing power support for the installation and fixation of the heat dissipation structure. A rotating block 15 is fixedly connected to the drive end of the electric push rod 14. The rotating block 15 moves with the extension and retraction of the electric push rod 14, and at the same time serves as the rotation fulcrum of the connecting rod 16 and the linkage rod 18, converting the linear motion of the electric push rod 14 into rotational motion and transmitting it to other components.

[0042] A connecting rod 16 is rotatably connected to the front side of the rotating block 15. One end of the connecting rod 16 is rotatably connected to the rotating block 15, and the other end is rotatably connected to the fixed block 17. When the rotating block 15 moves, its own swing restricts the movement trajectory of the rotating block 15, ensuring the stability of the transmission process. The other end of the connecting rod 16 is rotatably connected to the fixed block 17, which serves as a fixed fulcrum for the connecting rod 16, providing support for the swing of the connecting rod 16 and ensuring the stability of the connecting rod 16's position during transmission. A linkage rod 18 is rotatably connected to the top of the rotating block 15, which transmits the motion of the rotating block 15 to the connecting block 19.

[0043] The other end of the linkage 18 is rotatably connected to a connecting block 19. The connecting block 19 can directly transmit the movement of the linkage 18 to the clamping block 20, so that the clamping block 20 moves synchronously with the movement of the linkage 18. The top of the connecting block 19 is fixedly connected to the clamping block 20, which clamps and fixes the mounting block 22, thereby connecting the heat dissipation structure to the robot. The mounting block 22 is installed on the inner side of the clamping block 20. The mounting block 22 is a key component connecting the heat dissipation structure and the robot. By clamping and fixing it with the clamping block 20, the heat dissipation shell 1 is firmly installed on the robot. Two slide rails 21 are slidably connected to the rear side of the clamping block 20. The slide rails 21 provide guidance for the sliding of the clamping block 20, ensuring that the clamping block 20 moves smoothly along a preset trajectory during the movement, avoiding deviation or jamming.

[0044] Reference Figures 2 to 4 The outer side of the rotating shaft 7 is rotatably connected to the inside of the ventilation window 2, which provides support for the movement of the rotating shaft 7, ensuring its stability during operation. The upper and lower ends of the rotating plate 11 are rotatably connected to the inner side of the ventilation window 2, controlling the size of the ventilation opening. Two dust filters 23 are fixedly connected inside the heat sink 1. These filters prevent dust and impurities from the outside air from entering the heat sink 1, avoiding dust accumulation on components such as the fan 25 and fins 27, which could affect heat dissipation, and protecting internal components from contaminant corrosion.

[0045] A bracket 24 is fixedly connected inside the heat sink 1. The bracket 24 provides a stable mounting support for the fan 25, ensuring the fan 25 remains stable during high-speed operation and preventing vibration from affecting the fan 25's efficiency and lifespan. The fan 25 is fixedly connected to the top of the bracket 24. The fan 25 accelerates the airflow inside the heat sink 1 through high-speed rotation, forming a forced airflow to promote heat exchange with the air. It is the core power component for air-cooled heat dissipation. A ventilation duct 26 is fixedly connected to the rear side of the fan 25. The ventilation duct 26 connects the fan 25 to the upper dust filter 23 and is fixed inside the heat sink 1, guiding the airflow. The front side of the ventilation duct 26 is fixedly connected to the rear side of the upper dust filter 23 and to the inside of the heat sink 1.

[0046] Fins 27 are fixedly connected inside the heat sink 1. The fins 27 employ a multi-plate structure, increasing the heat dissipation area and allowing heat to be dissipated into the air more quickly, accelerating heat dissipation and making them a crucial component for enhancing heat dissipation. Two heat pipes 28 are fixedly connected inside the fins 27. The other end of each heat pipe 28 is connected to internal circuit components of the robot. The internal medium of each heat pipe flows, transferring heat from the circuit components to the fins 27, serving as an important channel for heat conduction and facilitating heat diffusion. The outer sides of the two heat pipes 28 are fixedly connected inside the heat sink 1, providing space and support for their installation. A liquid cooling plate 29 is fixedly connected to the top of the fins 27. The liquid cooling plate 29 assists the air-cooling structure, further absorbing heat from the fins 27 and increasing the heat dissipation effect of the heat sink structure.

[0047] A condenser tube 30 is fixedly connected inside the liquid cooling plate 29. The coolant inside the condenser tube 30 carries away the heat absorbed by the liquid cooling plate 29 during its flow. A circulation pump exchanges the liquid inside the liquid cooling plate 29 with the liquid inside the coolant storage tank, thus dissipating the heat and completing the liquid cooling cycle. The outer side of the condenser tube 30 is fixedly connected to the inside of the heat sink 1. The rear side of the fixing block 17 is fixedly connected to the front side of the L-shaped block 12, ensuring the stability of the connecting rod 16 during rotation. The outer side of the mounting block 22 is slidably connected to the inside of the L-shaped block 12. The rear sides of the two slide rails 21 are fixedly connected to the front side of the L-shaped block 12, and the rear side of the clamping block 20 is slidably connected to the front side of the L-shaped block 12, preventing the clamping block 20 from shifting during movement.

[0048] Working principle: When the motor 3 is started, it rotates and drives the drive wheel 4, which is fixedly connected to its drive end, to move. The movement of the drive wheel 4 drives the belt 5 to rotate, which in turn transmits its power to the driven wheel 6. The movement of the driven wheel 6 drives the rotating shaft 7 to rotate. The rotation of the rotating shaft 7 causes the first bevel gear 8 to rotate, which in turn causes the second bevel gear 9, which meshes with it, to rotate. The second bevel gear 9 transmits its movement to the rotating plate 11 through the rotating rod 10, causing the rotating plate 11 to rotate. This allows the rotating plate 11 to open and close. During operation, the blades unfold to ensure unobstructed heat dissipation channels, allowing heat to be efficiently dissipated to maintain the robot's normal operating temperature. After operation, the blades automatically close, effectively preventing dust and impurities from entering the heat dissipation structure, reducing problems such as decreased heat dissipation efficiency and wear of parts caused by dust accumulation.

[0049] Push the mounting block 22 into the groove of the L-shaped block 12 and start the electric push rod 14. The electric push rod 14 starts to move and drives the rotating block 15 fixedly connected to its drive end to move. The movement of the rotating block 15 drives the connecting rod 16 to rotate around the fixed block 17 as the fulcrum. At the same time, the movement of the rotating block 15 drives the linkage rod 18 to rotate, so that the linkage rod 18 drives the clamping block 20 to slide on the front side of the slide rail 21 through the connecting block 19. This allows the clamping block 20 to clamp the mounting block 22, thereby fixing the heat sink 1. This can improve assembly efficiency, reduce unnecessary adjustments and contact with the heat sink components during installation, reduce the risk of damage caused by improper operation, and at the same time, allow the heat sink components to be quickly and accurately aligned with the robot body, ensuring the stability after installation.

[0050] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A robot heat dissipation structure, comprising a heat dissipation shell (1), characterized in that: Two ventilation windows (2) are fixedly connected to the front side of the heat sink (1). A motor (3) is fixedly connected inside the two ventilation windows (2). A drive wheel (4) is fixedly connected to the drive end of the motor (3). A belt (5) is sleeved on the outside of the drive wheel (4). A driven wheel (6) is rotatably connected to the other end of the belt (5). A rotating shaft (7) is rotatably connected inside the driven wheel (6). Multiple bevel gears (8) are fixedly connected to the outside of the rotating shaft (7). Multiple rotating rods (10) are rotatably connected inside the ventilation windows (2). A bevel gear (9) is fixedly connected to the top of each of the multiple rotating rods (10). The outside of the bevel gear (9) is meshed with the outside of the bevel gear (8). A rotating plate (11) is fixedly connected to the outside of each of the multiple rotating rods (10). An installation assembly for installing a heat dissipation structure is provided on the outside of the heat sink (1).

2. The robot heat dissipation structure according to claim 1, characterized in that: The mounting assembly includes two L-shaped blocks (12). The two L-shaped blocks (12) are fixedly connected to the outer side of the heat sink (1) on their adjacent sides. The front sides of the two L-shaped blocks (12) are fixedly connected to protective covers (13). The front sides of the two L-shaped blocks (12) are fixedly connected to electric push rods (14). The driving end of the electric push rod (14) is fixedly connected to a rotating block (15). The front side of the rotating block (15) is rotatably connected to a connecting rod (16). The other end of the connecting rod (16) is rotatably connected to a fixing block (17). The top end of the rotating block (15) is rotatably connected to a linkage rod (18). The other end of the linkage rod (18) is rotatably connected to a connecting block (19). The top end of the connecting block (19) is fixedly connected to a clamping block (20). The inner side of the clamping block (20) is equipped with a mounting block (22). The rear side of the clamping block (20) is slidably connected to two slide rails (21).

3. The robot heat dissipation structure according to claim 1, characterized in that: The outer side of the rotating shaft (7) is rotatably connected to the inside of the ventilation window (2), and the upper and lower ends of the rotating plate (11) are rotatably connected to the inner side of the ventilation window (2).

4. The robot heat dissipation structure according to claim 1, characterized in that: The heat sink (1) has two dustproof nets (23) fixedly connected inside, and a bracket (24) fixedly connected inside.

5. The robot heat dissipation structure according to claim 4, characterized in that: A fan (25) is fixedly connected to the top of the bracket (24), and a ventilation pipe (26) is fixedly connected to the rear side of the fan (25).

6. A robot heat dissipation structure according to claim 5, characterized in that: The front side of the ventilation pipe (26) is fixedly connected to the rear side of the dustproof net (23) on the upper side, and the front side of the ventilation pipe (26) is fixedly connected to the inside of the heat dissipation shell (1).

7. The robot heat dissipation structure according to claim 1, characterized in that: The heat sink (1) has fins (27) fixedly connected inside, and two heat sinks (28) are fixedly connected inside the fins (27). The outer sides of the two heat sinks (28) are fixedly connected inside the heat sink (1).

8. A robot heat dissipation structure according to claim 7, characterized in that: The top of the fin (27) is fixedly connected to a liquid cooling plate (29), and the inside of the liquid cooling plate (29) is fixedly connected to a condenser tube (30). The outside of the condenser tube (30) is fixedly connected to the inside of the heat dissipation shell (1).

9. A robot heat dissipation structure according to claim 2, characterized in that: The rear side of the fixing block (17) is fixedly connected to the front side of the L-shaped block (12), and the outer side of the mounting block (22) is slidably connected to the inside of the L-shaped block (12).

10. A robot heat dissipation structure according to claim 2, characterized in that: The rear sides of the two slide rails (21) are fixedly connected to the front side of the L-shaped block (12), and the rear side of the clamping block (20) is slidably connected to the front side of the L-shaped block (12).