Polar plate for reducing starting time of alkaline hydrogen production device and assembly process of polar plate
By designing an assembly process in which metal rings are welded to the inner wall of the electrode plates of an alkaline hydrogen production unit and uniformly perforated, the problems of long start-up time and high power loss of the alkaline hydrogen production unit have been solved, achieving rapid start-up and reduced energy consumption.
Patent Information
- Application Number
- CN202410367316.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2023-04-17
- Filing Date
- 2024-03-28
- Publication Date
- 2026-01-13
AI Technical Summary
Existing alkaline hydrogen production units have long start-up times, high energy consumption, and uneven drilling operations are required for metal ring processing.
Design an electrode structure including a metal ring with a welded partition on the inner wall and uniformly perforated on its side, assembled by a special device to form a cavity to accelerate temperature rise, and using a placement unit and a rotation unit for stable placement and uniform drilling.
The start-up time of the alkaline hydrogen production unit is shortened to 2 hours, reducing energy consumption by 4000 kWh and improving processing efficiency and uniformity.
Smart Images
Figure CN121321084A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of hydrogen production technology, and in particular relates to an electrode plate for reducing the start-up time of an alkaline hydrogen production device and its assembly process. Background Technology
[0002] The start-up time of alkaline hydrogen production devices currently on the market is mainly determined by the alkaline hydrogen electrolyzer. The optimal electrolysis temperature is when the cell temperature reaches about 80℃. The electrodes of the alkaline hydrogen electrolyzer are all assembled from multiple single-layer electrodes. In the actual operation of the existing electrolyzer, the alkaline solution flows through both sides of the single-layer electrode. The temperature of the electrolyzer is composed of the temperature of the alkaline solution and the temperature of the single-layer electrode. The temperature rise of the alkaline solution and the single-layer electrode relies solely on the heat generated by the internal resistance when the current passes through, resulting in slow temperature rise and high power loss in the alkaline hydrogen production device. Among them, the electrode plates made of metal rings need to be drilled on their sides during processing. It is necessary to uniformly drill holes in metal rings of different sizes and diameters.
[0003] Based on this, an electrode plate and its assembly process for reducing the start-up time of alkaline hydrogen production units are proposed to solve the above problems. Summary of the Invention
[0004] This invention provides an electrode plate and its assembly process for reducing the start-up time of an alkaline hydrogen production device. It aims to address the problem that in existing electrolyzers, the alkaline solution flows through both sides of a single-layer electrode plate during operation. The temperature of the electrolyzer is determined by the temperature of the alkaline solution and the single-layer electrode plate, and the temperature rise of these components relies solely on the heat generated by the internal resistance when current flows through them. This results in slow temperature rise and high energy loss in the alkaline hydrogen production device. Furthermore, the electrode plate, made of metal rings, requires drilling holes on its sides during processing, necessitating uniform drilling of metal rings of different sizes and diameters.
[0005] The present invention is implemented as follows: an electrode plate for reducing the start-up time of an alkaline hydrogen production device includes a main electrode plate, the main electrode plate including a metal ring, two symmetrically arranged partitions fixedly connected to the inner wall of the metal ring, holes evenly distributed on the metal ring, and a cavity formed between the holes and the two partitions, the partitions being 0.6mm steel plates, and the distance between the two partitions being 0.8mm.
[0006] An assembly process for electrode plates used to reduce start-up time in alkaline hydrogen production units, comprising the following steps:
[0007] Step 1: Take a metal ring and weld the partition to the inner wall of the metal ring using a welding machine;
[0008] Step 2: Place the metal ring with the welded partition obtained in Step 1 onto the hole-opening device, and evenly open holes on the side of the metal ring using the hole-opening device.
[0009] Step 3: Remove the metal ring with the hole obtained in Step 2, polish it with a polishing device, and remove the dust adhering to its surface.
[0010] Preferably, the drilling device includes a base plate, on which a placement unit for placing a metal ring is provided, and a drilling assembly is provided on the base plate. The drilling assembly includes a rotating unit, on which a drilling unit is provided.
[0011] Preferably, the placement unit includes a placement rod fixedly connected to a base plate, a placement plate fixedly connected to the side of the placement rod, a first rotating ring threaded onto the outer side of the placement rod, a rotating protrusion arranged in a circumferential array fixedly connected to the outer side of the first rotating ring, a hollow structure inside the placement rod, a first pushing block disposed inside the placement rod, two symmetrically arranged first connecting rods fixedly connected to the side of the first pushing block, a first snap-fit plate fixedly connected to the ends of the two first connecting rods, a through groove that mates with the first connecting rod on the placement rod, a first annular groove that mates with the first snap-fit plate on the inner side of the first rotating ring, a plurality of limiting blocks slidably connected to the side of the placement rod, a second pushing block fixedly connected to the inner side of the limiting block, a third pushing block fixedly connected to the upper end of the first pushing block, a first inclined surface disposed on the inner side of the second pushing block, a second inclined surface disposed on the side of the third pushing block, a plurality of snap-fit plates arranged in a circumferential array fixedly connected to the side of the third pushing block, and a first snap-fit groove that mates with the snap-fit plates disposed inside the second pushing block.
[0012] Preferably, the rotating unit includes a first connecting plate fixedly connected to a base plate, a rotating motor fixedly connected to the lower end of the first connecting plate, a rotating plate fixedly connected to the output end of the rotating motor, a second rotating ring provided on the base plate, an annular snap-fit plate fixedly connected to the base plate, a second annular groove cooperating with the annular snap-fit plate being formed in the second rotating ring, a first rotating tooth distributed in a circumferential array fixedly connected to the outer side of the second rotating ring, and a second rotating tooth cooperating with the first rotating tooth fixedly connected to the side of the rotating plate.
[0013] Preferably, the drilling unit includes a support side plate fixedly connected to a second rotating ring, a second connecting plate fixedly connected to the upper end of the support side plate, a first motor fixedly connected to the second connecting plate, a reciprocating lead screw fixedly connected to the output end of the first motor, the end of the reciprocating lead screw being rotatably connected to the first rotating ring, a reciprocating slider sleeved on the outer side of the reciprocating lead screw, a drilling cylinder fixedly connected to the side of the reciprocating slider, a second motor fixedly connected to the output end of the drilling cylinder, and a drill bit fixedly connected to the output end of the second motor.
[0014] Preferably, a limit unit is provided on the base plate.
[0015] Preferably, the limiting unit includes a second connecting rod fixedly connected to the base plate, a limiting ring sleeved on the side of the second connecting rod, a limiting spike fixedly connected to the side of the limiting ring, a third connecting plate fixedly connected to the end of the second connecting rod, and a torsion spring provided between the limiting ring and the third connecting plate.
[0016] Compared with the prior art, the embodiments of this application have the following main advantages:
[0017] 1. The metal ring forms a cavity under the action of the partition. Two hours before starting the alkaline hydrogen production unit, technicians will inject water at a constant temperature of 85°C into the new flow area and circulate it to heat the electrolyzer until it reaches 65°C. At this point, the alkaline hydrogen production unit starts and stops circulating the 85°C water. The temperature of the alkaline hydrogen production electrolyzer will rise from 65°C to 85°C. This process takes 2 hours, reducing the start-up time of the 2.5MW alkaline hydrogen production unit to 2 hours. This reduces the energy consumption of the 2.5MW alkaline hydrogen production unit by nearly 4000 KW*H during startup.
[0018] 2. By setting up the placement unit, metal rings of different sizes can be placed stably;
[0019] 3. Through the setting of the rotating unit, the rotating motor rotates to drive the rotating plate to rotate, the second rotating ring rotates to drive the second rotating tooth on it to rotate, the second rotating tooth cooperates with the first rotating tooth, and the second rotating tooth can drive the first rotating tooth to rotate one tooth when it rotates once, thereby driving the metal ring to move evenly. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the structure of an electrode plate for reducing the start-up time of an alkaline hydrogen production device provided by the present invention;
[0021] Figure 2 This is a schematic diagram of the overall structure of the perforation device in the assembly process of an electrode plate for reducing the start-up time of an alkaline hydrogen production unit, provided by the present invention.
[0022] Figure 3yes Figure 2 Enlarged structural diagram at point A;
[0023] Figure 4 yes Figure 2 Enlarged structural diagram at point B;
[0024] Figure 5 yes Figure 2 Enlarged structural diagram at point C;
[0025] Figure 6 This is a schematic diagram of the structure of a placement unit in the assembly process of an electrode plate for reducing the start-up time of an alkaline hydrogen production unit, provided by the present invention. Figure 1 ;
[0026] Figure 7 yes Figure 6 Enlarged structural diagram at point D;
[0027] Figure 8 This is a schematic diagram of the structure of a placement unit in the assembly process of an electrode plate for reducing the start-up time of an alkaline hydrogen production unit, provided by the present invention. Figure 2 ;
[0028] Figure 9 This is a partial structural schematic diagram of the rotating unit in the assembly process of an electrode plate for reducing the start-up time of an alkaline hydrogen production device, provided by the present invention.
[0029] Reference numerals in the attached drawings: 1. Base plate; 201. Placement rod; 202. Placement plate; 203. First rotating ring; 204. Rotating protrusion; 205. First pushing block; 206. First connecting rod; 207. First snap-fit plate; 208. Through groove; 209. First annular groove; 210. Limiting block; 211. Second pushing block; 212. Third pushing block; 213. First inclined surface; 214. Second inclined surface; 215. Snap-fit plate; 216. First snap-fit groove; 301. First connecting plate; 302. Rotating motor; 303. Rotating plate; 304. Second rotating ring; 305. Annular snap-fit plate; 306. Second annular groove; 307. First rotating tooth; 308. Second rotating tooth; 4. Metal ring; 5. Main electrode plate; 6. Partition plate; 7. Hole; 801. Support side plate; 802. Second connecting plate; 803. First motor; 804. Reciprocating lead screw; 805. Reciprocating slider; 806. Drilling cylinder; 807. Second motor; 808. Drill bit; 901. Second connecting rod; 902. Limiting ring; 903. Limiting spike; 904. Third connecting plate; 905. Torsion spring. Detailed Implementation
[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, not to describe a particular order.
[0031] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.
[0032] like Figure 1-9 As shown, this embodiment of the invention provides an electrode plate for reducing the start-up time of an alkaline hydrogen production device, including a main electrode plate 5. The main electrode plate 5 includes a metal ring 4. Two symmetrically arranged partitions 6 are fixedly connected to the inner wall of the metal ring 4. Holes 7 are evenly distributed on the metal ring 4, and a cavity is formed between the holes 7 and the two partitions 6. A new flow domain is formed in the cavity. The partitions 6 are made of 0.6 mm steel plates, and the distance between the two partitions 6 is 0.8 mm.
[0033] Two hours before starting the alkaline hydrogen production unit, technicians will inject water at a constant temperature of 85°C into the new flow area and circulate it to heat the electrolyzer until it reaches 65°C. At this point, the alkaline hydrogen production unit will start and stop circulating the 85°C water. The temperature of the alkaline hydrogen production electrolyzer will then rise from 65°C to 85°C over a period of two hours.
[0034] The start-up time of the alkaline hydrogen production unit (2.5MW) was reduced to 2 hours. This reduced the energy consumption of the alkaline hydrogen production unit (2.5MW) during start-up by nearly 4000 kWh.
[0035] An assembly process for electrode plates used to reduce start-up time in alkaline hydrogen production units, comprising the following steps:
[0036] Step 1: Take the metal ring 4 and weld the partition 6 to the inner wall of the metal ring 4 using a welding machine;
[0037] Step 2: Place the metal ring 4 with the welded partition 6 obtained in Step 1 onto the hole-opening device, and evenly open holes 7 on the side of the metal ring 4 through the hole-opening device.
[0038] Step 3: Remove the metal ring 4 with the hole 7 obtained in Step 2, polish it with a polishing device, and remove the dust adhering to its surface.
[0039] The hole-opening device includes a base plate 1, on which a placement unit for placing a metal ring 4 is provided, and a drilling assembly is provided on the base plate 1. The drilling assembly includes a rotating unit, and the rotating unit is provided with a drilling unit.
[0040] In actual use, the above-mentioned device places metal rings 4 of different sizes through the placement unit, and then drives the drilling unit to rotate through the rotation unit to perform uniform drilling on the side of the metal rings 4.
[0041] Combination Figure 5 , Figure 6 , Figure 7 and Figure 8 The placement unit includes a placement rod 201 fixedly connected to a base plate 1. A placement plate 202 is fixedly connected to the side of the placement rod 201. A first rotating ring 203 is threaded onto the outer side of the placement rod 201. A circular array of rotating protrusions 204 are fixedly connected to the outer side of the first rotating ring 203. The placement rod 201 has a hollow interior. A first pushing block 205 is provided inside the placement rod 201. Two symmetrically arranged first connecting rods 206 are fixedly connected to the side of the first pushing block 205. A first snap-fit plate 207 is fixedly connected to the ends of the two first connecting rods 206. A through groove 2 is provided on the placement rod 201 to cooperate with the first connecting rods 206. 08. The inner side of the first rotating ring 203 is provided with a first annular groove 209 that cooperates with the first snap-fit plate 207. The side of the placement rod 201 is slidably connected with a plurality of limiting blocks 210. The inner side of the limiting block 210 is fixedly connected with a second pushing block 211. The upper end of the first pushing block 205 is fixedly connected with a third pushing block 212. The inner side of the second pushing block 211 is provided with a first inclined surface 213. The side of the third pushing block 212 is provided with a second inclined surface 214. The side of the third pushing block 212 is fixedly connected with a plurality of snap-fit plates 215 arranged in a circular array. The second pushing block 211 is provided with a first snap-fit groove 216 that cooperates with the snap-fit plate 215.
[0042] In actual use, the metal ring 4 is placed on the placement plate 202, and then the first rotating ring 203 is rotated to move vertically on the placement rod 201. During the movement, due to the setting of the first snap-fit plate 207 and the first connecting rod 206, the first pushing block 205 is moved vertically. The movement of the first pushing block 205 drives the third pushing block 212 to move. The first inclined surface 213 and the second inclined surface 214 of the third pushing block 212, which are in contact with the second pushing block 211, cooperate to cause the displacement of the limiting block 210 in the horizontal direction to change. The multiple limiting blocks 210 cooperate to contact the inner wall of the metal ring 4 to limit the metal ring 4 and place it stably.
[0043] Combination Figure 3 , Figure 4 and Figure 9 The rotating unit includes a first connecting plate 301 fixedly connected to the base plate 1. A rotating motor 302 is fixedly connected to the lower end of the first connecting plate 301. A rotating plate 303 is fixedly connected to the output end of the rotating motor 302. A second rotating ring 304 is provided on the base plate 1. An annular snap-fit plate 305 is fixedly connected to the base plate 1. A second annular groove 306 that cooperates with the annular snap-fit plate 305 is opened in the second rotating ring 304. A first rotating tooth 307 distributed in a circular array is fixedly connected to the outer side of the second rotating ring 304. A second rotating tooth 308 that cooperates with the first rotating tooth 307 is fixedly connected to the side of the rotating plate 303.
[0044] Limiting units are provided on the base plate 1.
[0045] The limiting unit includes a second connecting rod 901 fixedly connected to the base plate 1. A limiting ring 902 is sleeved on the side of the second connecting rod 901. A limiting spike 903 is fixedly connected to the side of the limiting ring 902. A third connecting plate 904 is fixedly connected to the end of the second connecting rod 901. A torsion spring 905 is provided between the limiting ring 902 and the third connecting plate 904.
[0046] In actual use, the rotating unit described above rotates, causing the rotating plate 303 to rotate, and the second rotating ring 304 rotates, causing the second rotating tooth 308 on it to rotate. The second rotating tooth 308 cooperates with the first rotating tooth 307. When the second rotating tooth 308 rotates once, it can drive the first rotating tooth 307 to rotate one tooth. Thus, under the control of the rotating motor 302, the second rotating ring 304 rotates evenly. Under the action of the torsion spring 905 of the limiting unit, the limiting spike 903 limits the rotation direction of the second rotating tooth 308, which can only rotate in one direction.
[0047] The drilling unit includes a support side plate 801 fixedly connected to a second rotating ring 304. A second connecting plate 802 is fixedly connected to the upper end of the support side plate 801. A first motor 803 is fixedly connected to the second connecting plate 802. A reciprocating lead screw 804 is fixedly connected to the output end of the first motor 803. The end of the reciprocating lead screw 804 is rotatably connected to the first rotating ring 203. A reciprocating slider 805 is sleeved on the outer side of the reciprocating lead screw 804. A drilling cylinder 806 is fixedly connected to the side of the reciprocating slider 805. A second motor 807 is fixedly connected to the output end of the drilling cylinder 806. A drill bit 808 is fixedly connected to the output end of the second motor 807.
[0048] When the above-mentioned drilling unit is actually used, the first motor 803 rotates, driving the reciprocating lead screw 804 to rotate, which in turn drives the reciprocating slider 805 to move back and forth, driving the second motor 807 and the drilling cylinder 806 to move up and down. After moving to the position corresponding to the metal ring 4, the drilling motor starts, driving the drill bit 808 to rotate, and the drilling cylinder 806 controls the drilling operation.
[0049] In summary, the working principle of this invention is as follows: Metal rings 4 of different sizes are placed using a placement unit, and then a drilling unit is rotated using a rotating unit to uniformly drill holes on the sides of the metal rings 4. The metal rings 4 are placed on the placement plate 202, and then the first rotating ring 203 is rotated, causing it to move vertically on the placement rod 201. During this movement, due to the first snap-fit plate 207 and the first connecting rod 206, the first pushing block 205 moves vertically. The movement of the first pushing block 205 causes the third pushing block 212 to move. The first inclined surface 213 and the second inclined surface 214 of the third pushing block 212, which contact the second pushing block 211, cooperate to cause the displacement of the limiting block 210 in the horizontal direction to change. Multiple limiting blocks 210 cooperate to contact the inner wall of the metal rings 4, limiting and stably placing the metal rings 4. The rotation of motor 302 drives the rotating plate 303 to rotate, and the rotation of the second rotating ring 304 drives the second rotating tooth 308 on it to rotate. The second rotating tooth 308 cooperates with the first rotating tooth 307. One rotation of the second rotating tooth 308 can drive the first rotating tooth 307 to rotate one tooth. Thus, under the control of the rotating motor 302, the second rotating ring 304 is driven to rotate evenly. Under the action of the torsion spring 905 of the limiting unit, the limiting spike 903 limits the rotation direction of the second rotating tooth 308, which can only rotate in one direction. The rotation of the first motor 803 drives the reciprocating screw 804 to rotate, which in turn drives the reciprocating slider 805 to move back and forth, driving the second motor 807 and the drilling cylinder 806 to move up and down. After moving to the position corresponding to the metal ring 4, the drilling motor starts and drives the drill bit 808 to rotate. The drilling cylinder 806 controls the drilling operation.
[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. 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. An electrode plate for reducing the start-up time of an alkaline hydrogen production unit, characterized in that, The device includes a main electrode plate (5), which includes a metal ring (4). Two symmetrically arranged partitions (6) are fixedly connected to the inner wall of the metal ring (4). Holes (7) are evenly distributed on the metal ring (4). A cavity is formed between the holes (7) and the two partitions (6). The partitions (6) are made of 0.6mm steel plates, and the distance between the two partitions (6) is 0.8mm.
2. An assembly process for electrode plates used to reduce the start-up time of an alkaline hydrogen production unit, characterized in that, The steps include: Step 1: Take a metal ring (4) and weld the partition (6) onto the inner wall of the metal ring (4) using a welding machine; Step 2: Place the metal ring (4) with the welded partition (6) obtained in Step 1 onto the hole-opening device, and make holes (7) evenly on the side of the metal ring (4) through the hole-opening device. Step 3: Remove the metal ring (4) with the hole (7) obtained in Step 2, polish it with a polishing device, and remove the dust adhering to its surface.
3. The assembly process of the electrode plate for reducing the start-up time of an alkaline hydrogen production unit as described in claim 2, characterized in that, The hole-opening device includes a base plate (1), on which a placement unit for placing a metal ring (4) is provided, and a drilling assembly is provided on the base plate (1). The drilling assembly includes a rotating unit, on which a drilling unit is provided.
4. The assembly process of the electrode plate for reducing the start-up time of an alkaline hydrogen production unit as described in claim 3, characterized in that, The placement unit includes a placement rod (201) fixedly connected to a base plate (1). A placement plate (202) is fixedly connected to the side of the placement rod (201). A first rotating ring (203) is threaded onto the outer side of the placement rod (201). A rotating protrusion (204) distributed in a circular array is fixedly connected to the outer side of the first rotating ring (203). The placement rod (201) has a hollow internal structure. A first pushing block (205) is provided inside the placement rod (201). Two symmetrically arranged first connecting rods (206) are fixedly connected to the side of the first pushing block (205). A first snap-fit plate (207) is fixedly connected to the ends of the two first connecting rods (206). A through groove (207) that mates with the first connecting rod (206) is provided on the placement rod (201). 8) The inner side of the first rotating ring (203) is provided with a first annular groove (209) that cooperates with the first snap-fit plate (207). The side of the placement rod (201) is slidably connected with a plurality of limiting blocks (210). The inner side of the limiting block (210) is fixedly connected with a second pushing block (211). The upper end of the first pushing block (205) is fixedly connected with a third pushing block (212). The inner side of the second pushing block (211) is provided with a first inclined surface (213). The side of the third pushing block (212) is provided with a second inclined surface (214). The side of the third pushing block (212) is fixedly connected with a plurality of snap-fit plates (215) arranged in a circular array. The second pushing block (211) is provided with a first snap-fit groove (216) that cooperates with the snap-fit plate (215).
5. The assembly process of the electrode plate for reducing the start-up time of an alkaline hydrogen production unit as described in claim 3, characterized in that, The rotating unit includes a first connecting plate (301) fixedly connected to the base plate (1), a rotating motor (302) fixedly connected to the lower end of the first connecting plate (301), a rotating plate (303) fixedly connected to the output end of the rotating motor (302), a second rotating ring (304) provided on the base plate (1), an annular snap-fit plate (305) fixedly connected on the base plate (1), a second annular groove (306) that cooperates with the annular snap-fit plate (305) is opened in the second rotating ring (304), a first rotating tooth (307) distributed in a circular array is fixedly connected to the outer side of the second rotating ring (304), and a second rotating tooth (308) that cooperates with the first rotating tooth (307) is fixedly connected to the side of the rotating plate (303).
6. The assembly process of the electrode plate for reducing the start-up time of an alkaline hydrogen production unit as described in claim 3, characterized in that, The drilling unit includes a support side plate (801) fixedly connected to a second rotating ring (304). A second connecting plate (802) is fixedly connected to the upper end of the support side plate (801). A first motor (803) is fixedly connected to the second connecting plate (802). A reciprocating screw (804) is fixedly connected to the output end of the first motor (803). The end of the reciprocating screw (804) is rotatably connected to the first rotating ring (203). A reciprocating slider (805) is sleeved on the outer side of the reciprocating screw (804). A drilling cylinder (806) is fixedly connected to the side of the reciprocating slider (805). A second motor (807) is fixedly connected to the output end of the drilling cylinder (806). A drill bit (808) is fixedly connected to the output end of the second motor (807).
7. The assembly process of the electrode plate for reducing the start-up time of an alkaline hydrogen production unit as described in claim 3, characterized in that, Limiting units are provided on the base plate (1).
8. The assembly process of the electrode plate for reducing the start-up time of an alkaline hydrogen production unit as described in claim 7, characterized in that, The limiting unit includes a second connecting rod (901) fixedly connected to the base plate (1), a limiting ring (902) sleeved on the side of the second connecting rod (901), a limiting spike (903) fixedly connected to the side of the limiting ring (902), a third connecting plate (904) fixedly connected to the end of the second connecting rod (901), and a torsion spring (905) provided between the limiting ring (902) and the third connecting plate (904).