A power module with an overheat protection structure

Abstract

The application discloses a power module with an anti-overheating protection structure, belonging to the technical field of power supply modules. Multiple batteries are arranged equidistantly in the longitudinal direction on a support frame, a gap exists between two adjacent batteries, and a temperature sensor for monitoring the heat generated by the battery in real time is arranged on the battery. A heat dissipation mechanism for controlling the convection of internal and external air and preventing dust from entering the periphery of the battery is arranged on the shell. A fan for accelerating the flow of air is movably arranged on one side of the battery in the shell, and a driving mechanism for controlling the movement and rotation of the fan to expand the heat dissipation range is arranged in the shell. The power module with the anti-overheating protection structure has a gap between the multiple batteries stacked in the shell. The heat generated by the battery during operation is discharged outward through the heat dissipation ports and heat dissipation channels on the two sides. The power module realizes rapid cooling in the internal through ventilation, thereby realizing the overheating protection of the power module during operation and maintaining the stable operation of the smart grid voltage.

Description

A power module with an overheat protection structure Technical Field

[0001] This invention relates to the field of power supply module technology, specifically a power supply module with an overheat protection structure. Background Technology

[0002] As a crucial piece of equipment in power distribution, the quality of power supply modules directly determines the overall power supply quality. In smart grid environments, the operation of power supply modules is paramount. The larger the power supply capacity of a module, the greater the heat it generates, directly impacting the safety of power supply operation. Cooling, ventilation, and temperature reduction technologies are key factors in ensuring stable operation and extending the service life of power supply modules. Cooling methods mainly include natural cooling, fan cooling, heat conduction, and hybrid cooling technologies combining multiple methods. The cooling method directly affects the module's operating temperature and efficiency, thereby influencing the stability of the power grid. The selection of a cooling method for a power supply module must consider the input voltage range and operating temperature range to ensure stable operation even when the grid voltage fluctuates.

[0003] For example, patent CN212751581U discloses a high-frequency switching DC power supply cabinet with microcomputer monitoring, including a cabinet structure and a system module structure. The cabinet structure includes a cabinet, glass door, partition, control room, power supply room, upper guide plate, lower guide plate, through pipe, integrated circuit tube, transformer, cooling water channel, heat dissipation hole, side sealing plate, fixing part, fixing plate, back sealing door, spring lock, switch, ventilation hole, handle and control main board. The control room is located above the power supply room and is relatively isolated, which serves to insulate heat and reduce electromagnetic interference to the switching elements and the control main board. The ventilation hole serves to ventilate and dissipate heat. The main control unit outputs an alarm signal through a power saving signal module and can also realize the alarm function by connecting to an external signal panel. The use of dual CPUs can improve the processing speed and efficiency of the main control unit. The intelligent management function of the battery can ensure that the battery operates automatically according to the charging curve.

[0004] For example, patent CN119674753A discloses a power supply box with heat dissipation function, including a box body. An electrical module mounting plate is fixedly connected to one inner wall of the box body. A water collection shell is fixedly connected to multiple inner walls of the box body. A pipe is fixedly connected to the outer side of the water collection shell. Multiple heat-conducting plates are fixedly connected to multiple inner walls of the water collection shell. A water collection box is fixedly connected to the bottom of the water collection shell. Both sides of the water collection shell at the bottom position have drainage holes that communicate with the inside of the water collection box. This not only collects water droplets generated by condensation in the pipes, preventing water droplets from entering the power supply box and causing short circuits in the electrical components, but also rapidly cools the water in the water tank, improving the cooling efficiency of the water in the water tank, thereby improving the heat dissipation efficiency of the power supply box. It can also provide auxiliary heat dissipation for the power supply box, improving the heat dissipation effect of the power supply box.

[0005] For example, patent CN214625850U discloses a wall-mounted DC power supply cabinet, including a system cabinet, a battery cabinet on one side of the system cabinet, and cabinet doors near the edges of both the system cabinet and the battery cabinet. Several sets of heat dissipation vents are provided on the upper surfaces of both the system cabinet and the battery cabinet. A support plate is located near the middle of the inner sidewalls of the system cabinet. A monitoring module is located near the left side of the upper part of the support plate, and a step-down module is located near the right side of the upper part of the support plate. Several sets of adjustment mechanisms are located at the upper part of the support plate, between the monitoring module and the step-down module. This allows for fine-tuning of the position of the rectifier modules without affecting the wiring, thereby changing the spacing between adjacent sets of rectifier modules. This effectively allows for adjustments to the positions of the rectifier modules in different locations. The battery is cooled to improve the heat dissipation effect of the DC power supply cabinet. The power module generates a lot of heat during long-term operation. Overheating will cause the performance indicators of the internal components of the power supply to decrease as the temperature rises. For example, the maximum output power, operating efficiency and lifespan of the power supply will decrease as the temperature rises. This directly affects the normal operation capability of the power supply. Overheating may also cause unstable output voltage or abnormal current output. Some power modules are equipped with heat dissipation structures, such as heat dissipation holes on the surface of the power supply casing. However, the gas fluctuation inside and outside the power supply is limited, which makes its ventilation and heat dissipation range very limited. When the internal heat of the power module is high, the internal heat of the power module cannot be reduced quickly, which will affect the safe operation of the power module.

[0006] To address the aforementioned issues, there is an urgent need for innovative design based on the existing power module. Summary of the Invention

[0007] The purpose of this invention is to provide a power module with an overheat protection structure to solve the problem mentioned in the background art that some power modules are equipped with heat dissipation structures, such as heat dissipation holes on the surface of the power supply casing. However, the limited gas fluctuation inside and outside the power supply results in a very limited ventilation and heat dissipation range. When the internal heat of the power module is high, the internal heat of the power module cannot be reduced quickly, which affects the safe operation of the power module.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a power module with an overheat protection structure, comprising a housing and multiple batteries fixedly installed in the housing. The housing has terminals for connecting to the batteries, and a support frame is fixedly installed inside the housing. Multiple batteries are arranged longitudinally at equal intervals on the support frame, with gaps between adjacent batteries. Each battery is equipped with a temperature sensor for real-time monitoring of its own operating heat. The housing has a heat dissipation mechanism to control internal and external gas convection and prevent dust from entering the area around the batteries. Inside the housing, a fan is movably arranged on one side of the batteries to accelerate gas flow, and a drive mechanism is provided inside the housing to control the movement and rotation of the fan to expand the heat dissipation range.

[0009] Preferably, the heat dissipation mechanism includes multiple heat dissipation vents evenly spaced on the side of the outer shell, and a heat dissipation channel connected to the heat dissipation vents is installed inside the outer shell; a movable cover is slidably connected to the inner wall of the heat dissipation channel, and heat dissipation mesh covers are fitted around the movable cover, with the heat dissipation mesh covers fitting against the inner wall of the heat dissipation channel.

[0010] Preferably, a heat sink is fixedly installed on the side of the movable cover away from the heat dissipation vent, and the position of the heat sink is laterally distributed corresponding to the position of the battery.

[0011] Preferably, the drive mechanism includes a lead screw rotatably connected to the housing, an internal threaded seat is threaded onto the outer side of the lead screw, a transverse upright is fixedly connected to the internal threaded seat, and a longitudinal upright is fixedly installed on the transverse upright; the longitudinal upright is rotatably connected to the fan.

[0012] Preferably, a guide bracket is fixedly installed on the inner side wall of the outer shell, and the longitudinal upright is slidably connected to the inner side of the guide bracket.

[0013] Preferably, a driving bevel gear is rotatably connected to the longitudinal frame, and a driven bevel gear is meshed next to the driving bevel gear. The driven bevel gear is rotatably mounted on the longitudinal frame and is coaxially connected to the fan.

[0014] Preferably, a fixing frame is fixedly installed on the guide bracket, and multiple main tooth block groups are fixed at equal intervals on one side of the fixing frame, and multiple auxiliary tooth block groups are fixed at equal intervals on the other side of the fixing frame; the main tooth block groups and auxiliary tooth block groups are staggered.

[0015] Preferably, a planar gear is coaxially connected to the driving bevel gear, and the planar gear moves longitudinally to mesh with the main gear block group and the auxiliary gear block group in sequence.

[0016] Preferably, a plurality of the longitudinally distributed movable covers are fixedly connected, and a movable bracket is fixedly connected next to the movable cover, with a short protruding rod fixedly installed on the movable bracket;

[0017] A long convex rod is fixedly installed on the horizontal upright, and a transmission rotating rod connects the long convex rod and the short convex rod.

[0018] Preferably, one end of the transmission rod is rotatably connected to the long protruding rod, and the other end of the transmission rod is rotatably connected to the short protruding rod.

[0019] Compared with the prior art, the beneficial effects of the present invention are: the power module with an overheat protection structure has gaps between the multiple batteries stacked in the casing, and the heat generated by the batteries during operation is discharged to the outside through the heat dissipation vents and heat dissipation channels on both sides. The power module achieves rapid internal cooling through ventilation, thereby achieving overheat protection for the operation of the power module and maintaining the stable operation of the smart grid voltage.

[0020] Furthermore, the outer casing is equipped with a heat dissipation mechanism to control the convection of internal and external gases and prevent dust from entering the area around the battery. A movable cover is slidably connected in the heat dissipation channel. When the power module generates a large amount of heat, the movable cover is controlled to move laterally back and forth along the direction of the heat dissipation channel. The gas inside the outer casing convects with each other through the heat dissipation mesh on the movable cover. With the fan running, the convection of gas inside and outside the outer casing is assisted, accelerating the heat in the outer casing to be discharged to the outside.

[0021] As the moving cover moves horizontally back and forth, it drives the heat sink to move synchronously. The heat sink moves back and forth around the battery, which can expand the range of heat absorption. Some of the heat is absorbed by the heat sink and discharged to the outside, further improving the overheat protection effect of the power module.

[0022] Furthermore, the outer casing is equipped with a drive mechanism that controls the movement and rotation of the fan to expand the heat dissipation range. The motor controls the lead screw to reciprocate. Under the threaded transmission between the lead screw and the internal thread seat, the internal thread seat, the horizontal upright and the vertical upright can be controlled to move up and down. The vertical upright drives the fan to move up and down synchronously, expanding the air blowing range of the fan, so that the heat generated by multiple batteries can be blown out of the outer casing, improving the heat dissipation effect.

[0023] During the longitudinal reciprocating movement of the vertical frame, the planar gear meshes with the main gear block and the auxiliary gear block on both sides in sequence. Under the meshing transmission, it can drive the active bevel gear to rotate. Under the meshing transmission of the active bevel gear and the driven bevel gear, it can drive the fan to rotate, thereby controlling the fan to rotate left and right. This causes the fan to swing between the heat dissipation vents on both sides, accelerating the convection of heat inside and outside the casing.

[0024] Meanwhile, as the longitudinal frame moves up and down, the rotation of the transmission rod drives the lateral movement of the movable support, which in turn drives the movable cover to move back and forth along the heat dissipation channel, assisting in the internal and external convection of gas. Attached Figure Description

[0025] Figure 1 is a schematic diagram of the three-dimensional structure of the outer shell of the present invention.

[0026] Figure 2 is a schematic diagram of the cross-sectional structure of the outer shell of the present invention.

[0027] Figure 3 is a schematic diagram of the three-dimensional structure of the battery of the present invention.

[0028] Figure 4 is a schematic diagram of the three-dimensional structure of the fan of the present invention.

[0029] Figure 5 is a schematic diagram of the three-dimensional structure of the lead screw of the present invention.

[0030] Figure 6 is a three-dimensional structural diagram of the guide bracket of the present invention.

[0031] Figure 7 is a schematic diagram of the longitudinal upright three-dimensional structure of the present invention.

[0032] Figure 8 is a schematic diagram of the three-dimensional structure of the driven bevel gear of the present invention.

[0033] Figure 9 is a schematic diagram of the three-dimensional structure of the active bevel gear of the present invention.

[0034] Figure 10 is a schematic diagram of the three-dimensional structure of the movable support of the present invention.

[0035] Figure 11 is a schematic diagram of the three-dimensional structure of the heat dissipation mesh cover of the present invention.

[0036] Figure 12 is a schematic diagram of the three-dimensional structure of the heat sink of the present invention.

[0037] Figure 13 is a schematic diagram of the three-dimensional structure of the horizontal upright frame of the present invention.

[0038] Figure 14 is a three-dimensional structural diagram of the transmission rod of the present invention.

[0039] In the diagram: 1. Outer casing; 2. Battery; 3. Terminal block; 4. Support frame; 5. Heat dissipation vent; 6. Heat dissipation channel; 7. Movable cover; 8. Heat dissipation mesh cover; 9. Heat sink; 10. Fan; 11. Lead screw; 12. Internal threaded seat; 13. Horizontal support frame; 14. Longitudinal support frame; 15. Guide bracket; 16. Driving bevel gear; 17. Driven bevel gear; 18. Planar gear; 19. Main gear block assembly; 20. Secondary gear block assembly; 21. Fixed frame; 22. Movable bracket; 23. Short convex rod; 24. Transmission rod; 25. Long convex rod. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] Example 1: Please refer to Figures 1-14. The present invention provides the following technical solution: A power module with an overheat protection structure includes a housing 1 and multiple batteries 2 fixedly installed in the housing 1. The housing 1 is equipped with terminals 3 connected to the batteries 2, and a support frame 4 is fixedly installed inside the housing 1. The multiple batteries 2 are arranged longitudinally at equal intervals on the support frame 4, with gaps between adjacent batteries 2. A temperature sensor for real-time monitoring of its own operating heat is installed on the batteries 2. A heat dissipation mechanism is provided on the housing 1 to control the convection of internal and external air and prevent dust from entering the area around the batteries 2. A fan 10 is movably arranged inside the housing 1 on one side of the batteries 2 to accelerate the air flow, and a drive mechanism is provided in the housing 1 to control the movement and rotation of the fan 10 to expand the heat dissipation range.

[0042] The heat dissipation mechanism includes multiple heat dissipation vents 5 evenly spaced on the side of the outer shell 1, and a heat dissipation channel 6 connected to the heat dissipation vents 5 is installed inside the outer shell 1; a movable cover 7 is slidably connected to the inner wall of the heat dissipation channel 6, and heat dissipation mesh covers 8 are fitted around the movable cover 7, with the heat dissipation mesh covers 8 fitting against the inner wall of the heat dissipation channel 6.

[0043] A heat sink 9 is fixedly installed on the side of the movable cover 7 away from the heat dissipation port 5, and the position of the heat sink 9 is horizontally distributed corresponding to the position of the battery 2.

[0044] When the power module is in use, multiple batteries 2 in the housing 1 are powered on and run. The movable cover 7 moves and closes in the heat dissipation channel 6 to prevent external dust from entering the interior of the housing 1 through the heat dissipation mesh cover 8. The batteries 2 gradually generate heat during long-term operation in the closed environment. The heat is absorbed by the heat sink 9 on the movable cover 7 and dissipated to the outside through the heat sink 9, thus achieving the purpose of cooling the interior of the housing 1.

[0045] The temperature sensor installed on battery 2 monitors the heat in real time. When the detected heat value exceeds the normal range, the moving cover 7 is controlled to move back and forth along the direction of heat dissipation channel 6. When the heat dissipation mesh 8 on the moving cover 7 moves into the shell 1, the air inside and outside the shell 1 convects with each other through the heat dissipation mesh 8, which accelerates the heat dissipation. In addition, the movement of the moving cover 7 drives the heat sink 9 to move synchronously. During the movement, the heat sink 9 expands its heat absorption range. The closer it moves to battery 2, the more heat it absorbs, which further assists in the heat dissipation and achieves the purpose of overheat protection.

[0046] Example 2: Based on Example 1, a drive mechanism is also disclosed, the specific structure of which is as follows: The drive mechanism includes a lead screw 11 rotatably connected in the housing 1, an internal thread seat 12 is threaded on the outside of the lead screw 11, a transverse support 13 is fixedly connected to the internal thread seat 12, and a longitudinal support 14 is fixedly installed on the transverse support 13; the longitudinal support 14 is rotatably connected to the fan 10.

[0047] A guide bracket 15 is fixedly installed on the inner wall of the outer casing 1, and the longitudinal upright 14 is fitted and slidably connected to the inner side of the guide bracket 15.

[0048] A drive bevel gear 16 is rotatably connected to the longitudinal frame 14, and a driven bevel gear 17 is meshed with the drive bevel gear 16. The driven bevel gear 17 is rotatably mounted on the longitudinal frame 14 and is coaxially connected to the fan 10.

[0049] A fixing frame 21 is fixedly installed on the guide bracket 15. Multiple main tooth block groups 19 are fixed at equal intervals on one side of the fixing frame 21, and multiple auxiliary tooth block groups 20 are fixed at equal intervals on the other side of the fixing frame 21. The main tooth block groups 19 and auxiliary tooth block groups 20 are staggered.

[0050] A planar gear 18 is coaxially connected to the drive bevel gear 16. The planar gear 18 moves longitudinally and meshes with the main gear block group 19 and the auxiliary gear block group 20 in sequence.

[0051] Multiple longitudinally distributed movable covers 7 are fixedly connected, and a movable bracket 22 is fixedly connected next to the movable cover 7. A short protruding rod 23 is fixedly installed on the movable bracket 22.

[0052] A long protruding rod 25 is fixedly installed on the horizontal upright frame 13, and a transmission rotating rod 24 is connected between the long protruding rod 25 and the short protruding rod 23.

[0053] One end of the transmission rod 24 is rotatably connected to the long protruding rod 25, and the other end of the transmission rod 24 is rotatably connected to the short protruding rod 23.

[0054] The motor in the outer casing 1 drives the lead screw 11 to rotate reciprocally. When the lead screw 11 rotates, it drives the internal thread seat 12 to move up and down reciprocally through the thread transmission. The internal thread seat 12 drives the horizontal upright 13 and the vertical upright 14 to move up and down synchronously. The vertical upright 14 is engaged inside the guide bracket 15 and moves stably longitudinally along the direction of the guide bracket 15. The fan 10 is installed in the vertical upright 14 and moves up and down synchronously with the vertical upright 14. The reciprocating movement of the fan 10 allows its blowing range to completely cover the multiple batteries 2 stacked vertically, so that the heat generated by the operation of the multiple batteries 2 can be dissipated to the outside, avoiding uneven heat dissipation of the batteries 2 due to the batteries 2 not being within the blowing range of the fan 10.

[0055] During the longitudinal reciprocating movement of the longitudinal upright 14, the planar gear 18 mounted on the longitudinal upright 14 moves synchronously with it. During the up-and-down reciprocating movement, the planar gear 18 meshes with the main gear block group 19 and the secondary gear block group 20 on both sides in sequence. The planar gear 18 can achieve forward and reverse reciprocating rotation when meshing left and right in sequence. The planar gear 18 is coaxially connected with the driving bevel gear 16. The rotation of the planar gear 18 drives the driving bevel gear 16 to rotate synchronously. The driving bevel gear 16 meshes with the driven bevel gear 17. Under the meshing transmission, the driven bevel gear 17 can be controlled to rotate forward and reverse. The driven bevel gear 17 drives the fan 10 to rotate back and forth, so that the fan 10 is set between the heat dissipation vents 5 on both sides of the outer casing 1 and swings back and forth, expanding the air blowing range of the fan 10, more effectively accelerating the convection of air inside and outside the outer casing 1, improving the heat dissipation effect of the power module, and effectively realizing the overheat protection function.

[0056] During the reciprocating movement of the longitudinal support 14, the long protruding rod 25 moves synchronously. At this time, the two ends of the transmission rod 24 connected between the long protruding rod 25 and the short protruding rod 23 rotate accordingly. The rotating transmission rod 24 can push the short protruding rod 23 and the moving bracket 22 to move back and forth in a directional manner. The moving bracket 22 pushes the moving cover 7 to move back and forth inside the heat dissipation channel 6, thereby achieving the purpose of driving the moving cover 7 to move. The reciprocating movement of the moving cover 7 can not only allow the gas inside and outside the outer shell 1 to convect through the heat dissipation mesh 8, but also expand the movement range of the heat sink 9, improve the heat absorption effect of the heat sink 9, further improve the heat dissipation and cooling effect of the power module operation, and achieve overheat protection for the battery 2.

[0057] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0058] Although the present invention 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 invention should be included within the protection scope of the present invention.

Claims

1. A power module with an overheat protection structure, comprising a housing (1) and a plurality of batteries (2) fixedly installed in the housing (1), characterized in that: The outer casing (1) is equipped with a terminal block (3) for connecting to the battery (2), and a support frame (4) is fixedly installed inside the outer casing (1). Multiple batteries (2) are arranged longitudinally at equal intervals on the support frame (4), with gaps between adjacent batteries (2). A temperature sensor for real-time monitoring of the operating heat is installed on the battery (2). The outer casing (1) is equipped with a heat dissipation mechanism to control the convection of internal and external gases and prevent dust from entering the area around the battery (2). Inside the outer casing (1), a fan (10) is movably arranged on one side of the battery (2) to accelerate the flow of gas. The outer casing (1) is also equipped with a drive mechanism to control the movement and rotation of the fan (10) to expand the heat dissipation range. The drive mechanism includes a lead screw (11) rotatably connected in the housing (1), an internal thread seat (12) is threaded on the outside of the lead screw (11), a transverse support (13) is fixedly connected to the internal thread seat (12), and a longitudinal support (14) is fixedly installed on the transverse support (13); the longitudinal support (14) is rotatably connected to the fan (10); a plurality of longitudinally distributed movable covers (7) are fixedly connected, a movable bracket (22) is fixedly connected next to the movable cover (7), and a short protruding rod (23) is fixedly installed on the movable bracket (22); a long protruding rod (25) is fixedly installed on the transverse support (13), and a transmission rotating rod (24) is connected between the long protruding rod (25) and the short protruding rod (23).

2. A power module with an overheat protection structure according to claim 1, characterized in that: The heat dissipation mechanism includes multiple heat dissipation openings (5) evenly spaced on the side of the outer shell (1), and a heat dissipation channel (6) connected to the heat dissipation openings (5) is installed inside the outer shell (1); a movable cover (7) is slidably connected to the inner wall of the heat dissipation channel (6), and a heat dissipation mesh cover (8) is fitted around the movable cover (7), and the heat dissipation mesh cover (8) is in contact with the inner wall of the heat dissipation channel (6).

3. A power module with an overheat protection structure according to claim 2, characterized in that: A heat sink (9) is fixedly installed on the side of the movable cover (7) away from the heat dissipation port (5), and the position of the heat sink (9) is laterally distributed in correspondence with the position of the battery (2).

4. A power module with an overheat protection structure according to claim 1, characterized in that: The inner wall of the outer shell (1) is fixedly installed with a guide bracket (15), and the longitudinal upright (14) is fitted and slidably connected to the inner side of the guide bracket (15).

5. A power module with an overheat protection structure according to claim 4, characterized in that: A drive bevel gear (16) is rotatably connected to the longitudinal frame (14), and a driven bevel gear (17) is meshed next to the drive bevel gear (16). The driven bevel gear (17) is rotatably mounted on the longitudinal frame (14), and the driven bevel gear (17) is coaxially connected to the fan (10).

6. A power module with an overheat protection structure according to claim 5, characterized in that: A fixed frame (21) is fixedly installed on the guide bracket (15). Multiple main tooth block groups (19) are fixed at equal intervals on one side of the fixed frame (21), and multiple auxiliary tooth block groups (20) are fixed at equal intervals on the other side of the fixed frame (21). The main tooth block groups (19) and the auxiliary tooth block groups (20) are staggered.

7. A power module with an overheat protection structure according to claim 6, characterized in that: The active bevel gear (16) is coaxially connected to a planar gear (18), which moves longitudinally and meshes with the main gear block group (19) and the auxiliary gear block group (20) in sequence.

8. A power module with an overheat protection structure according to claim 7, characterized in that: One end of the transmission rod (24) is rotatably connected to the long protruding rod (25), and the other end of the transmission rod (24) is rotatably connected to the short protruding rod (23).

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