Fuel cell runner suitable for low-temperature environment

Abstract

The invention relates to the technical field of fuel cell flow channels, in particular to a fuel cell flow channel suitable for a low-temperature environment, which comprises a flow field plate, a cell flow channel is fixedly arranged on the flow field plate, a plurality of heat preservation covers sleeve the cell flow channel, sealing mechanisms are fixedly connected to two ends of the cell flow channel, and a pull rope is arranged in the cell flow channel in a penetrating manner. Take-up seats are arranged at the two ends of the pull rope, a placement seat is fixedly connected to one take-up seat, a guide block is fixedly connected to the end, located in the placement seat, of the pull rope, a flow channel cleaning mechanism is rotationally connected to the outer wall of one end of the guide block, and a transmission mechanism is fixedly connected to the interior of the guide block. And under the driving of the pull rope, the runner cleaning mechanism can move in the battery runner. Meanwhile, under the driving of the transmission mechanism, the brush ring reciprocates while rotating, so that the inner wall of the flow channel of the battery can be more sufficiently cleaned, the deposited scale is effectively removed, the blockage of the flow channel is avoided, and the performance of the battery is maintained.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cell flow channels, and particularly to a fuel cell flow channel suitable for low-temperature environments. Background Art

[0002] The fuel cell flow channel is a part inside the fuel cell, usually used to guide reaction gases (such as hydrogen and oxygen) to the electrodes and discharge the by-products (such as water vapor) generated by the reaction from the cell. The design and function of the flow channel are crucial for the performance of the fuel cell.

[0003] The prior art document with the publication number CN115472861A provides a PEM fuel cell flow channel structure and a fuel cell, which uses the most basic flow channel structure for longitudinal and transverse wide and narrow alternating arrangements and combinations, can cause pressure differences in adjacent flow channels, so that pressure differences are generated on both sides of the area below the ridge bank, and then a transverse turbulence effect is created, forcing the gas to convect from the lower part of the flow channel to below the ridge bank, more directly and efficiently promoting the uniform distribution of reaction gases inside the cell, and improving the utilization rate of gas and catalyst; the sudden change in the flow channel width in the longitudinal direction will increase the local pressure drop, which is beneficial to the discharge of liquid water inside the flow channel and enhances the water management ability of the flow field.

[0004] The fuel (such as hydrogen or methanol) used in fuel cells (especially hydrogen fuel cells) may contain some trace impurities. These impurities may be deposited in the flow channel during the chemical reaction process of the fuel cell. For the multi-section interconnected S-shaped curved flow channels in the prior art, the S-shaped curved structure causes the fluid velocity to decrease when passing through, especially inside the elbow, and the fluid is prone to form vortices or stagnant areas, making it easier for impurities such as suspended particulate matter and sediments to deposit here, but the existing flow channels do not have the function of self-cleaning internal impurities. The accumulated impurities and pollutants will cause local blockage or poor fluidity of the flow channel, affect the flow of reaction gases, and may significantly reduce the flow rate of reaction gases in severe cases, significantly reducing the efficiency of the cell; in addition, during non-use, it does not have the port self-sealing function.

[0005] In summary, in the prior art, there is a lack of technology for automatically cleaning fuel cell flow channels. Summary of the Invention

[0006] The purpose of the present invention is to solve the drawbacks existing in the background art, and to propose a fuel cell flow channel suitable for low-temperature environments.

[0007] To achieve the above object, the technical solution adopted by the present invention is as follows: A fuel cell flow channel applicable to low-temperature environments, including a flow field plate, on which a battery flow channel is fixedly arranged. A plurality of heat preservation covers are sleeved on the battery flow channel. Sealing mechanisms are fixedly connected to both ends of the battery flow channel. A pull rope is threaded through the battery flow channel. Take-up seats are arranged at both ends of the pull rope. A placement seat is fixedly connected to one of the take-up seats. A guide block is fixedly connected to one end of the pull rope located in the placement seat. A flow channel cleaning mechanism is rotatably connected to the outer wall of one end of the guide block. A transmission mechanism is fixedly connected to the guide block.

[0008] Preferably, a plurality of electric heating wires are fixedly connected in an annular structure inside the heat preservation cover, and the bottom end of the heat preservation cover is fixedly connected to the flow field plate.

[0009] Preferably, pipe joints are fixedly connected to the bottoms of both ends of the battery flow channel, and support frames are fixedly connected to both ends of the battery flow channel. An air pump is fixedly connected to one of the support frames.

[0010] Preferably, the sealing mechanism includes an electric push rod, which is fixedly connected to the upper end of the support frame. A hinge seat is fixedly connected to the output end of the electric push rod. A connecting rod is rotatably connected to the hinge seat. The other end of the connecting rod is rotatably connected to a sealing plate, and the sealing plate is slidably matched with the support frame. A hose is fixedly connected through one of the sealing plates, and the other end of the hose is fixedly connected to the output end of the air pump.

[0011] Preferably, a winding shaft is rotatably connected inside the take-up seat. One end of the winding shaft is fixedly connected to the pull rope. One end of the winding shaft passes through the inner wall of the take-up seat and extends to the outside and is fixedly connected to a motor A, and the motor A is fixedly connected to the outer wall of the take-up seat.

[0012] Preferably, a contact frame is slidably matched with the inner wall of the placement seat. The bottom end of the contact frame is in movable contact with the guide block. A moving frame is fixedly connected to the upper end of the contact frame. A plurality of tension springs are fixedly connected to one side of the moving frame, and the other ends of the tension springs are fixedly connected to the inner wall of the placement seat. Two transmission inclined grooves are symmetrically arranged on the moving frame. A moving rod is slidably matched with the inner wall of the transmission inclined groove. The other end of the moving rod is fixedly connected to a cover plate, and the cover plate is slidably matched with the opening of the placement seat.

[0013] Preferably, the flow channel cleaning mechanism includes a brush ring, which is in frictional contact with the inner wall of the battery flow channel. A rotating ring is fixedly connected to one end of the brush ring, and the rotating ring is rotatably and slidably matched with the inner wall of the guide block. An annular rack is fixedly connected to the outer circumference of one end of the rotating ring located inside the guide block.

[0014] Preferably, the rotating ring is rotatably connected to a sliding ring at one end surface of the guide block, a guide frame is fixedly connected to the lower side of the sliding ring, the guide frame is slidably matched with the inner wall of the guide block, a spring is fixedly connected to one end of the guide frame, the other end of the spring is fixedly connected to the inner wall of the guide block, a pull rod group is rotatably connected to the upper side of the sliding ring, and the other end of the pull rod group is rotatably connected to the inner wall of the guide block.

[0015] Preferably, the transmission mechanism includes a motor B, which is fixedly connected to the inner wall of the guide block, and a rotating shaft is fixedly connected to the output end of the motor B. A transmission wheel is fixedly connected to the other end of the rotating shaft, and the transmission wheel is meshed with an annular rack for transmission. A toggle rod is fixedly connected to one end of the rotating shaft close to the motor B, and the other end of the toggle rod is in sliding contact with the pull rod group.

[0016] Compared with the prior art, the present invention has the following beneficial effects: By setting up a flow channel cleaning mechanism, the flow channel cleaning mechanism can move in the battery flow channel under the drive of the pull rope. At the same time, driven by the transmission mechanism, the brush ring reciprocates while rotating, which can more fully clean the inner wall of the battery flow channel, effectively remove scale, avoid flow channel blockage, and maintain battery performance. Regular cleaning of the battery flow channel can improve the heat dissipation efficiency of the battery, reduce internal heat accumulation, avoid battery performance degradation or damage due to overheating, and thus extend the battery life.

[0017] 2. By setting up a placement seat, the guide block and the flow channel cleaning mechanism can be safely and neatly stored when not in use, avoiding these components from taking up space or causing damage to the equipment. At the same time, by setting up a mobile frame and a tension spring, the cover plate can be automatically opened and closed while the guide block is moved out and retracted, reducing manual intervention, improving the degree of automation of the system, and ensuring the convenience and efficiency of the cleaning device. By setting up an electric heating wire in the insulation cover, the working efficiency of the device in a low temperature environment can be improved, avoiding the slow start-up or flow channel blockage caused by low temperature, and improving the working reliability of the device in cold weather.

[0018] 3. Through the sealing mechanism, the two ends of the battery flow channel can be sealed when there is no need to clean the inner wall of the battery flow channel. At the same time, by setting up an air pump, when water accumulates in the battery flow channel due to battery tilt, the high-pressure gas ejected by the air pump can discharge the accumulated water in the battery flow channel, effectively avoiding the adverse effects of accumulated water on the battery flow channel and battery performance, and ensuring the safety, stability and efficient operation of the battery system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of a fuel cell flow channel suitable for low-temperature environments according to the present invention; Figure 2 It is a partial cross-sectional schematic diagram of a partial structure of a fuel cell flow channel suitable for low temperature environment of the present invention; Figure 3 It is a partial cross-sectional schematic diagram of a heat preservation cover structure of a fuel cell flow channel suitable for a low-temperature environment according to the present invention; Figure 4 It is a schematic diagram of the structure of a battery flow channel and a sealing mechanism of a fuel cell flow channel suitable for a low-temperature environment of the present invention; Figure 5 It is a partial cross-sectional schematic diagram of a wire take-up seat structure of a fuel cell flow channel suitable for low-temperature environments according to the present invention; Figure 6 It is a partial cross-sectional schematic diagram of a placement seat structure of a fuel cell flow channel suitable for low-temperature environments according to the present invention; Figure 7 It is a partial cross-sectional schematic diagram of the structure of a guide block and a transmission mechanism of a fuel cell flow channel suitable for a low-temperature environment according to the present invention; Figure 8 The present invention is a schematic structural diagram of a flow channel cleaning mechanism for a fuel cell flow channel suitable for a low temperature environment.

[0020] The following are marked in the figure: 1, flow field plate; 2, battery flow channel; 3, heat preservation cover; 4, sealing mechanism; 5, pull rope; 6, wire take-up seat; 7, placement seat; 8, guide block; 9, flow channel cleaning mechanism; 10, transmission mechanism; 301, electric heating wire; 201, support frame; 202, air pump; 401, electric push rod; 402, hinge seat; 403, connecting rod; 404, sealing plate; 405, hose; 601, winding shaft; 60 2. Motor A; 701. Contact frame; 702. Moving frame; 703. Transmission chute; 704. Moving rod; 705. Cover plate; 706. Tension spring; 901. Brush ring; 902. Rotating ring; 903. Ring rack; 904. Sliding ring; 905. Guide frame; 906. Spring; 907. Tie rod assembly; 1001. Motor B; 1002. Rotating shaft; 1003. Transmission wheel; 1004. Toggle rod. DETAILED DESCRIPTION

[0021] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0022] like Figures 1 - 8A fuel cell flow channel suitable for a low-temperature environment is shown, comprising a flow field plate 1, a battery flow channel 2 is fixedly arranged on the flow field plate 1, a plurality of heat preservation covers 3 are sleeved on the battery flow channel 2, sealing mechanisms 4 are fixedly connected at both ends of the battery flow channel 2, a pull rope 5 is passed through the battery flow channel 2, and a wire take-up seat 6 is arranged at both ends of the pull rope 5, one of the wire take-up seats 6 is fixedly connected to a placement seat 7, a guide block 8 is fixedly connected to one end of the pull rope 5 located in the placement seat 7, a flow channel cleaning mechanism 9 is rotatably connected to the outer wall of one end of the guide block 8, and a transmission mechanism 10 is fixedly connected in the guide block 8.

[0023] like Figure 3 As shown, a plurality of electric heating wires 301 are fixedly connected in an annular structure in the heat preservation cover 3, and the bottom end of the heat preservation cover 3 is fixedly connected to the flow field plate 1. The air pump 202 is used to spray high-pressure gas into the battery flow channel 2 through the hose 405, so that the accumulated water in the battery flow channel 2 can be quickly discharged.

[0024] like Figure 4 As shown, pipe joints are fixedly connected to the bottom of both ends of the battery flow channel 2, and support frames 201 are fixedly connected to both ends of the battery flow channel 2, and an air pump 202 is fixedly connected to one of the support frames 201.

[0025] like Figure 4 As shown, the sealing mechanism 4 includes an electric push rod 401, which is fixedly connected to the upper end of the support frame 201, and a hinge seat 402 is fixedly connected to the output end of the electric push rod 401. A connecting rod 403 is rotatably connected to the hinge seat 402, and a sealing plate 404 is rotatably connected to the other end of the connecting rod 403. The sealing plate 404 is slidably matched with the support frame 201, and a hose 405 is fixedly connected to one of the sealing plates 404, and the other end of the hose 405 is fixedly connected to the output end of the air pump 202. The electric push rod 401 drives the connected hinge seat 402 to move downward, so that the hinge seat 402 drives the sealing plate 404 connected to the connecting rod 403 to move outward and open.

[0026] like Figure 5 As shown, a winding shaft 601 is rotatably connected in the wire take-up seat 6, one end of the winding shaft 601 is fixedly connected to the pull rope 5, one end of the winding shaft 601 passes through the inner wall of the wire take-up seat 6 and extends to the outside and is fixedly connected to a motor A602, which is fixedly connected to the outer wall of the wire take-up seat 6. The motor A602 on one of the wire take-up seats 6 is used to drive the connected winding shaft 601 to rotate, so that the winding shaft 601 drives the pull rope 5, thereby driving the guide block 8 on the pull rope 5 to move out of the placement seat 7.

[0027] like Figure 6As shown in the figure, a contact frame 701 is slidably fitted to the inner wall of the placement base 7. The bottom end of the contact frame 701 is in movable contact with the guide block 8. The upper end of the contact frame 701 is fixedly connected to a moving frame 702. A plurality of tension springs 706 are fixedly connected to one side of the moving frame 702. The other ends of the tension springs 706 are fixedly connected to the inner wall of the placement base 7. Two transmission inclined grooves 703 are symmetrically formed in the moving frame 702. A moving rod 704 is slidably fitted to the inner wall of the transmission inclined groove 703. The other end of the moving rod 704 is fixedly connected to a cover plate 705. The cover plate 705 is slidably fitted to the opening of the placement base 7. When the guide block 8 moves, the contact frame 701 is not restricted. Under the action of the tension spring 706, it will drive the moving frame 702 to move, so that the transmission inclined groove 703 on the moving frame 702 will drive the cover plate 705 connected to the moving rod 704 to move outwards automatically and open.

[0028] As Figure 8 shown in the figure, the runner cleaning mechanism 9 includes a brush ring 901. The brush ring 901 is in frictional contact with the inner wall of the battery runner 2. One end of the brush ring 901 is fixedly connected to a rotating ring 902. The rotating ring 902 is rotationally and slidably fitted to the inner wall of the guide block 8. An annular rack 903 is fixedly connected to the outer circumference of one end of the rotating ring 902 located inside the guide block 8.

[0029] A sliding ring 904 is rotatably connected to the end face of one end of the rotating ring 902 located inside the guide block 8. A guide frame 905 is fixedly connected to the lower side of the sliding ring 904. The guide frame 905 is slidably fitted to the inner wall of the guide block 8. One end of the guide frame 905 is fixedly connected to a spring 906. The other end of the spring 906 is fixedly connected to the inner wall of the guide block 8. A pull rod group 907 is rotatably connected to the upper side of the sliding ring 904. The other end of the pull rod group 907 is rotatably connected to the inner wall of the guide block 8. The motor B1001 drives the transmission wheel 1003 connected to the rotating shaft 1002 to rotate, so that the transmission wheel 1003 can drive the rotating ring 902 connected to the annular rack 903 to rotate, so that the brush ring 901 connected to the rotating ring 902 rotates for cleaning. At the same time, the rotating shaft 1002 will drive the connected toggle rod 1004 to rotate, so that the toggle rod 1004 contacts and presses the pull rod group 907, causing the pull rod group 907 to fold inwards. At this time, the sliding ring 904 will be pulled to move. Then when the toggle rod 1004 is not in contact with the pull rod group 907, under the action of the spring 906, the sliding ring 904 connected to the guide frame 905 will be reset.

[0030] By setting the flow channel cleaning mechanism 9, the flow channel cleaning mechanism 9 can move in the battery flow channel 2 under the drive of the pull rope 5. At the same time, under the drive of the transmission mechanism 10, the brush ring 901 reciprocates while rotating, which can more fully clean the inner wall of the battery flow channel 2, effectively remove the scale, avoid the blockage of the flow channel, and maintain the battery performance. Regularly cleaning the battery flow channel 2 can improve the heat dissipation efficiency of the battery, reduce internal heat accumulation, avoid battery performance degradation or damage due to overheating, and thus extend the service life of the battery.

[0031] like Figure 7 As shown, the transmission mechanism 10 includes a motor B1001, which is fixedly connected to the inner wall of the guide block 8, and a rotating shaft 1002 is fixedly connected to the output end of the motor B1001. A transmission wheel 1003 is fixedly connected to the other end of the rotating shaft 1002. The transmission wheel 1003 is meshed with the annular rack 903 for transmission. A toggle rod 1004 is fixedly connected to one end of the rotating shaft 1002 close to the motor B1001, and the other end of the toggle rod 1004 is in sliding contact with the pull rod group 907.

[0032] Working principle: When the external environment temperature is low, the electric heating wire 301 in the heat preservation cover 3 is used to heat and keep the battery flow channel 2 warm to ensure its normal use. When the battery is unbalanced, water will accumulate in the battery flow channel 2. At this time, the air pump 202 is used to spray high-pressure gas into the battery flow channel 2 through the hose 405, so that the water in the battery flow channel 2 can be quickly discharged to ensure its normal conduction; Then, when the inner wall of the battery flow channel 2 needs to be cleaned, the electric push rod 401 is first used to drive the connected hinge seat 402 to move downward, so that the hinge seat 402 drives the sealing plate 404 connected to the connecting rod 403 to move outward and open; Then, the motor A602 on one of the take-up seats 6 is used to drive the connected winding shaft 601 to rotate, so that the winding shaft 601 drives the pull rope 5, thereby driving the guide block 8 on the pull rope 5 to move out of the placement seat 7. At this time, when the guide block 8 moves, the contact frame 701 is not restricted. Under the action of the tension spring 706, the moving frame 702 is driven to move, so that the transmission inclined slot 703 on the moving frame 702 drives the cover plate 705 connected to the moving rod 704 to automatically move outward and open; Then, after the guiding block 8 enters the battery flow channel 2, the driving wheel 1003 connected to the rotating shaft 1002 is driven by the motor B1001 to rotate, so that the driving wheel 1003 can drive the rotating ring 902 connected to the annular rack 903 to rotate, and the brush ring 901 connected to the rotating ring 902 rotates for cleaning. At the same time, the rotating shaft 1002 drives the connected toggle rod 1004 to rotate, so that the toggle rod 1004 contacts and presses the pull rod group 907, causing the pull rod group 907 to fold in half towards the middle. At this time, the sliding ring 904 is pulled to move. Then, when the toggle rod 1004 does not contact the pull rod group 907, under the action of the spring 906, the sliding ring 904 connected to the guiding frame 905 is reset, so as to drive the brush ring 901 to reciprocate for cleaning; After the guiding block 8 is pulled out from the other end of the battery flow channel 2, the motor A602 in another wire take-up seat 6 drives the wire reel 601 to rotate, and the pull rope 5 is wound up, so that the guiding block 8 can be retracted into the placement seat 7.

[0033] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0034] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification is only the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A fuel cell flow channel suitable for low temperature environments, comprising a flow field plate (1), characterized in that: A battery flow channel (2) is fixedly arranged on the flow field plate (1), a plurality of heat-insulating covers (3) are sleeved on the battery flow channel (2), sealing mechanisms (4) are fixedly connected at both ends of the battery flow channel (2), a drawstring (5) is passed through the battery flow channel (2), and a wire take-up seat (6) is provided at both ends of the drawstring (5), a placement seat (7) is fixedly connected to one of the wire take-up seats (6), a guide block (8) is fixedly connected to one end of the drawstring (5) located in the placement seat (7), a flow channel cleaning mechanism (9) is rotatably connected to the outer wall of one end of the guide block (8), and a transmission mechanism (10) is fixedly connected to the inside of the guide block (8).

2. The fuel cell flow channel suitable for low temperature environment according to claim 1, characterized in that: A plurality of electric heating wires (301) are fixedly connected and arranged in an annular structure inside the heat-insulating cover (3), and the bottom end of the heat-insulating cover (3) is fixedly connected and arranged with the flow field plate (1).

3. The fuel cell flow channel suitable for low temperature environment according to claim 1, characterized in that: The bottoms of both ends of the battery flow channel (2) are fixedly connected with pipe joints, and both ends of the battery flow channel (2) are fixedly connected with support frames (201), and an air pump (202) is fixedly connected to one of the support frames (201).

4. The fuel cell flow channel suitable for low temperature environment according to claim 3, characterized in that: The sealing mechanism (4) comprises an electric push rod (401), the electric push rod (401) being fixedly connected to the upper end of the support frame (201), a hinge seat (402) being fixedly connected to the output end of the electric push rod (401), a connecting rod (403) being rotatably connected to the hinge seat (402), a sealing plate (404) being rotatably connected to the other end of the connecting rod (403), the sealing plate (404) being slidably matched to the support frame (201), a hose (405) being fixedly connected and penetrated through one of the sealing plates (404), the other end of the hose (405) being fixedly connected to the output end of the air pump (202).

5. The fuel cell flow channel suitable for low temperature environment according to claim 1, characterized in that: A winding shaft (601) is rotatably connected inside the wire take-up seat (6), one end of the winding shaft (601) is fixedly connected to the pull rope (5), one end of the winding shaft (601) passes through the inner wall of the wire take-up seat (6) and extends to the outside and is fixedly connected to a motor A (602), and the motor A (602) is fixedly connected to the outer wall of the wire take-up seat (6).

6. The fuel cell flow channel suitable for low temperature environment according to claim 1, characterized in that: A contact frame (701) is slidably provided on the inner wall of the placement seat (7), the bottom end of the contact frame (701) is movably contacted with the guide block (8), the upper end of the contact frame (701) is fixedly connected with a moving frame (702), one side of the moving frame (702) is fixedly connected with a plurality of tension springs (706), the other end of the tension spring (706) is fixedly connected with the inner wall of the placement seat (7), the moving frame (702) is symmetrically provided with two transmission inclined grooves (703), the inner wall of the transmission inclined groove (703) is slidably provided with a moving rod (704), the other end of the moving rod (704) is fixedly connected with a cover plate (705), and the cover plate (705) is slidably provided with an opening of the placement seat (7).

7. The fuel cell flow channel suitable for low temperature environment according to claim 1, characterized in that: The flow channel cleaning mechanism (9) comprises a brush ring (901), the brush ring (901) being arranged in frictional contact with the inner wall of the battery flow channel (2), one end of the brush ring (901) being fixedly connected to a rotating ring (902), the rotating ring (902) being arranged to rotate and slide with the inner wall of the guide block (8), and an annular rack (903) being fixedly connected to the outer circle of one end of the rotating ring (902) located inside the guide block (8).

8. The fuel cell flow channel suitable for low temperature environment according to claim 7, characterized in that: The rotating ring (902) is rotatably connected to a sliding ring (904) at one end surface located inside the guide block (8); a guide frame (905) is fixedly connected to the lower side of the sliding ring (904); the guide frame (905) is slidably matched with the inner wall of the guide block (8); a spring (906) is fixedly connected to one end of the guide frame (905); the other end of the spring (906) is fixedly connected to the inner wall of the guide block (8); a pull rod group (907) is rotatably connected to the upper side of the sliding ring (904); the other end of the pull rod group (907) is rotatably connected to the inner wall of the guide block (8).

9. A fuel cell flow channel suitable for low temperature environment according to claim 8, characterized in that: The transmission mechanism (10) comprises a motor B (1001), wherein the motor B (1001) is fixedly connected to the inner wall of the guide block (8), the output end of the motor B (1001) is fixedly connected to a rotating shaft (1002), the other end of the rotating shaft (1002) is fixedly connected to a transmission wheel (1003), the transmission wheel (1003) is meshed with an annular rack (903) for transmission, and one end of the rotating shaft (1002) close to the motor B (1001) is fixedly connected to a toggle rod (1004), and the other end of the toggle rod (1004) is in sliding contact with a pull rod group (907).

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