Aluminum plate-fin heat exchanger

Abstract

The utility model discloses an aluminum plate-fin heat exchanger which comprises a first clamping plate and a second clamping plate, the second clamping plate comprises a plate body, a plurality of clamping grooves are formed in the inner side of the plate body, a plurality of aluminum plate fins are installed in the clamping groove in the plate body of the first clamping plate and the clamping groove in the second clamping plate in a clamping mode through a connecting assembly, and the connecting assembly comprises a first fixing pipe. The first fixing pipe is fixed to the inner side of a plate body of the second clamping plate, a first sliding rod is slidably mounted on the side, away from the second clamping plate, of the first fixing pipe, the end, away from the first fixing pipe, of the first sliding rod is fixedly connected with the first clamping plate, a first screw is rotatably mounted in the first fixing pipe, and the first sliding rod is screwed outside the first screw. According to the aluminum plate-fin heat exchanger, when part of the aluminum plate fins are damaged, the aluminum plate fins are checked, and the aluminum plate fins needing to be maintained or replaced are determined. The damaged plate fin can be directly taken out from the clamping groove and replaced with a new plate fin; and corresponding maintenance operation can be carried out on the plate fins needing to be maintained.

Description

Technical Field

[0001] The utility model belongs to the technical field of heat exchangers, and in particular relates to an aluminum plate-fin heat exchanger. Background Art

[0002] Aluminum plate-fin heat exchanger is a new type of high-efficiency heat exchange equipment, which consists of a series of parallel plate fins, with channels formed between the plate fins, and heat exchange is carried out through the flow of fluid in the channels. Aluminum plate-fin heat exchanger has the advantages of compact structure, light weight, high heat transfer efficiency, corrosion resistance, etc., so it has been widely used in many fields, such as aerospace, automobile manufacturing, petrochemical, refrigeration and air conditioning, etc.

[0003] The patent with the publication number CN214747405U in the traditional technology discloses a pressure-resistant aluminum plate-fin heat exchanger, including a support base plate, a heat exchanger installation box, a fin plate and a longitudinal partition plate, the lower surface of the support base plate is fixedly connected with a threaded installation column, the surface of the threaded installation column is threadedly connected with a lifting support sleeve, and the upper surface of the support base plate is fixedly connected with a mounting vertical plate, the number of the mounting vertical plates is two, and the two mounting vertical plates are symmetrically arranged on the upper surface of the support base plate. The pressure-resistant aluminum plate-fin heat exchanger, by providing a heat exchanger installation box, a fin plate, a heat exchange medium head and a heat exchange material head, and the fin plates are arranged horizontally and vertically in intervals, can be divided into a plurality of interval heat exchange channels inside the heat exchanger installation box to achieve the purpose of heat exchange between materials and media, and by providing a longitudinal partition plate between two fin plates, the pressure resistance of the heat exchanger can be improved to avoid the vibration of the fin plate due to fluid flow, thereby causing damage to the equipment.

[0004] However, the aluminum plate fins of traditional aluminum plate-fin heat exchangers are welded or stacked, and collisions may occur during transportation or use, resulting in partial aluminum plate fins being unable to be repaired individually or being troublesome to disassemble and repair. Utility Model Content

[0005] The utility model aims to provide an aluminum plate-fin heat exchanger to solve the technical problems raised in the background technology.

[0006] To achieve the above-mentioned objectives, the specific technical scheme of the utility model is as follows: an aluminum plate-fin heat exchanger, comprising a first clamping plate and a second clamping plate, the first clamping plate and the second clamping plate having the same structure, the second clamping plate comprising a plate body, a plurality of slots being provided on the inner side of the plate body, the slots in the plate body of the first clamping plate and the slots in the second clamping plate being clamped and installed with a plurality of aluminum plate fins through a connecting assembly, the connecting assembly comprising a first fixed tube, the first fixed tube being fixed to the inner side of the plate body of the second clamping plate, a first sliding rod being slidably installed on a side of the first fixed tube away from the second clamping plate, an end of the first sliding rod being fixedly connected to the first clamping plate away from the first fixed tube, a first screw being rotatably installed inside the first fixed tube, the first screw being screwed to the first sliding rod on the outside, and one end of the first screw passing through the second clamping plate and being fixedly connected to a first knob.

[0007] Preferably, an opening is provided at the lower portion of the slot of the plate body, and the lower portion of the aluminum plate fin extends through the opening to the outside.

[0008] Preferably, the connection assembly further comprises a second fixing tube, and the second fixing tube is fixed to the inner side of the plate body of the second clamping plate.

[0009] Preferably, a second sliding rod is slidably mounted on a side of the second fixing tube away from the second clamping plate, and one end of the second sliding rod away from the second fixing tube is fixedly connected to the second clamping plate.

[0010] Preferably, a second screw is rotatably installed inside the second fixed tube, a slider is threaded on the outside of the second screw, a guide rod is fixedly connected to the inside of the second fixed tube, the guide rod is slidingly fitted with the slider and the second slide rod respectively, the slide rod is connected to the second slide rod through a spring, and one end of the second screw passes through the second clamping plate and is fixedly connected to a second knob.

[0011] Preferably, a screw connection is provided at the other end of the second screw rod, and the screw connection includes a rotating wheel, which is rotatably installed at the other end of the second screw rod, and the rotating wheel passes through the second screw rod and is fixedly connected to a limiting plate, and a third screw is fixedly connected to the side of the limiting plate away from the rotating wheel, and the third screw is screwed to the first clamping plate.

[0012] The aluminum plate-fin heat exchanger of the utility model has the following advantages:

[0013] 1. In the case of partial damage to the aluminum plate-fin heat exchanger, first, turn the first knob in the opposite direction to rotate the first screw and loosen the fixation of the first slide bar. At this time, the first slide bar can slide in the first fixed tube. Separate the first clamping plate and the second clamping plate: slide the first slide bar away from the second clamping plate until the clamping force between the first clamping plate and the second clamping plate disappears. Then, remove the first clamping plate from the aluminum plate fin. Replace or repair the aluminum plate fin: Check the aluminum plate fins to determine which ones need to be repaired or replaced. For damaged plate fins, they can be directly removed from the slot and replaced with new plate fins; for plate fins that need to be repaired, corresponding repair operations can be performed. Reinstall the aluminum plate fins: Put the repaired or replaced aluminum plate fins back into the slot of the second clamping plate, and then follow the steps of the installation process to re-use the connection assembly to fix the first clamping plate and the second clamping plate to ensure that the aluminum plate fins are firmly clamped. Users can easily repair or replace the aluminum plate fins individually, greatly improving the convenience and efficiency of maintenance. At the same time, this design also reduces the risk of damage caused by collision during transportation or use, and enhances the durability and reliability of the heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the second splint structure of the utility model;

[0017] Figure 3 This is a schematic diagram of the structure of the connection assembly of the utility model;

[0018] Figure 4 This is a schematic diagram of the structure of a connecting assembly of another embodiment of the utility model;

[0019] Figure 5 For the utility model Figure 4 Schematic diagram of the structure at A in the middle;

[0020] Figure 6 It is a schematic diagram of the screw connection structure of the utility model.

[0021] Explanation of marks in the figure: 1. first clamping plate; 2. second clamping plate; 3. connecting assembly; 4. aluminum plate fin; 5. screw connection; 201. plate body; 202. slot; 203. opening; 301. first fixed tube; 302. first screw; 303. first knob; 304. first slide bar; 311. second fixed tube; 312. second screw; 313. second knob; 314. slide bar; 315. spring; 316. second slide bar; 317. guide rod; 501. third screw; 502. limit plate; 503. rotating wheel. DETAILED DESCRIPTION

[0022] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the embodiments of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0023] In the description of the embodiments of the present invention, it should be understood that the terms "length", "vertical", "horizontal", "top", "bottom", etc. indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention.

[0024] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0025] In the embodiments of the present utility model, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0026] The disclosure below provides many different embodiments or examples for realizing different structures of the embodiments of the present utility model. In order to simplify the disclosure of the embodiments of the present utility model, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the embodiments of the present utility model. In addition, the embodiments of the present utility model can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0027] In order to better understand the purpose, structure and function of the utility model, the following is a further detailed description of an aluminum plate-fin heat exchanger of the utility model in conjunction with the accompanying drawings.

[0028] like Figure 1-6 As shown, an aluminum plate-fin heat exchanger of the utility model comprises a first clamping plate 1 and a second clamping plate 2. The first clamping plate 1 and the second clamping plate 2 have the same structure. The second clamping plate 2 comprises a plate body 201. A plurality of slots 202 are provided on the inner side of the plate body 201. The slots 202 in the plate body 201 of the first clamping plate 1 and the slots 202 in the second clamping plate 2 are clamped and installed with a plurality of aluminum plate fins 4 through a connecting component 3. The connecting component 3 comprises a first fixed tube 301. The first fixed tube 301 is fixed to the inner side of the plate body 201 of the second clamping plate 2. A first sliding rod 304 is slidably installed on the side of the first fixed tube 301 away from the second clamping plate 2. One end of the first sliding rod 304 away from the first fixed tube 301 is fixedly connected to the first clamping plate 1. A first screw 302 is rotatably installed inside the first fixed tube 301. The first screw 302 is externally screwed to the first sliding rod 304. One end of the first screw 302 passes through the second clamping plate 2 and is fixedly connected to a first knob 303.

[0029] For the above-mentioned aluminum plate-fin heat exchanger, first, ensure that the first clamping plate 1 and the second clamping plate 2 are ready and that the structures of the two are exactly the same. Check whether the slot 202 on the inner side of the plate body 201 is clean and intact, and ensure that the aluminum plate fin 4 is intact. Place the aluminum plate fins 4 one by one in the slot 202 of the second clamping plate 2, and ensure that each plate fin is firmly inserted into the slot 202. Align the first clamping plate 1 with the second clamping plate 2 so that the slot 202 on the first clamping plate 1 is aligned with the aluminum plate fin 4 in the second clamping plate 2. At this time, the first fixed tube 301 will correspond to the first slide bar 304. Slide the first slide bar 304 so that it enters the first fixed tube 301. Then, turn the first knob 303 to drive the first screw 302 to rotate. Since the first screw rod 302 and the first slide rod 304 are in a threaded connection, when the first screw rod 302 rotates, the first slide rod 304 will slide in the first fixed tube 301 and gradually approach the second clamping plate 2 until the first clamping plate 1 and the second clamping plate 2 are tightly fitted and the aluminum plate fin 4 is firmly clamped therebetween. Confirm that all aluminum plate fins 4 are evenly and firmly clamped between the first clamping plate 1 and the second clamping plate 2 without looseness or misalignment.

[0030] When part of the aluminum plate fin 4 is damaged, first, rotate the first knob 303 in the opposite direction to rotate the first screw 302 and loosen the fixation of the first slide bar 304. At this time, the first slide bar 304 can slide in the first fixed tube 301. Separate the first clamping plate 1 and the second clamping plate 2: Slide the first slide bar 304 away from the second clamping plate 2 until the clamping force between the first clamping plate 1 and the second clamping plate 2 disappears. Then, remove the first clamping plate 1 from the aluminum plate fin 4. Replace or repair the aluminum plate fin 4: Check the aluminum plate fin 4 to determine which ones need to be repaired or replaced. For damaged plate fins, they can be directly taken out from the slot 202 and replaced with new plate fins; for plate fins that need to be repaired, corresponding repair operations can be performed. Reinstall the aluminum plate fin 4: put the repaired or replaced aluminum plate fin 4 back into the slot 202 of the second clamping plate 2, and then use the connecting component 3 again to fix the first clamping plate 1 and the second clamping plate 2 according to the steps of the installation process to ensure that the aluminum plate fin 4 is firmly clamped.

[0031] The user can conveniently repair or replace the aluminum plate fin 4 individually, which greatly improves the convenience and efficiency of maintenance. At the same time, this design also reduces the risk of damage caused by collision during transportation or use, and enhances the durability and reliability of the heat exchanger.

[0032] In this embodiment, an opening 203 is provided at the lower portion of the slot 202 of the plate body 201 , and the lower portion of the aluminum plate fin 4 extends through the opening 203 to the outside.

[0033] When installing the aluminum plate fin 4, since the lower part of the slot 202 is provided with an opening 203, the lower part of the plate fin can easily pass through the opening 203 and be placed in the slot 202. Due to the design of the slot 202, the upper part of the plate fin will be firmly fixed, while the lower part will extend to the outside through the opening 203, so that the plate fin is stably installed between the first clamping plate 1 and the second clamping plate 2. Although the lower part of the aluminum plate fin 4 extends to the outside through the opening 203, the upper part of the plate fin is still firmly fixed by the slot 202. This design ensures the stability of the plate fin when the heat exchanger is working and prevents the plate fin from loosening or shifting due to fluid flow or vibration. When the aluminum plate fin 4 needs to be disassembled, repaired or replaced, since there is an opening 203 at the lower part, the operator can easily pull out the lower part of the plate fin from the opening 203 without complicated disassembly of the entire heat exchanger. This greatly simplifies the maintenance process and improves work efficiency.

[0034] In another embodiment, the connection assembly 3 further includes a second fixed tube 311, which is fixed to the inner side of the plate body 201 of the second clamping plate 2. A second slide bar 316 is slidably mounted on the side of the second fixed tube 311 away from the second clamping plate 2, and one end of the second slide bar 316 away from the second fixed tube 311 is fixedly connected to the second clamping plate 2. A second screw rod 312 is rotatably mounted inside the second fixed tube 311, and a slider 314 is screwed to the outside of the second screw rod 312. A guide rod 317 is fixedly connected inside the second fixed tube 311, and the guide rod 317 is slidably fitted with the slider 314 and the second slide bar 316 respectively. The slider 314 is connected to the second slide bar 316 through a spring 315, and one end of the second screw rod 312 passes through the second clamping plate 2 and is fixedly connected to a second knob 313.

[0035] First, the second fixed tube 311 is firmly fixed to the inner side of the plate body 201 of the second clamping plate 2 as a fixed support for the entire assembly. The second slide bar 316 is slidably mounted on the side of the second fixed tube 311 away from the second clamping plate 2, and the other end thereof is fixedly connected to the first clamping plate 1. Such a design allows the relative position between the first clamping plate 1 and the second clamping plate 2 to be adjusted by sliding the second slide bar 316. Inside the second fixed tube 311, the second screw rod 312 is rotatably mounted therein, and a slider 314 is screwed on its outside. When the second knob 313 is turned, due to the screw connection between the second screw rod 312 and the slider 314, the slider 314 will move linearly along the inside of the second fixed tube 311. This linear movement is achieved by relative motion between the threads, making the operation more precise and stable. In order to ensure that the slider 314 and the second slide bar 316 can slide smoothly, a guide rod 317 is also fixedly connected to the inside of the second fixed tube 311. The guide rod 317 is in sliding contact with the slider 314 and the second slider 316, so that the slider 314 can be prevented from deflecting or shaking during the movement, ensuring that it moves along the predetermined path. The slider 314 is connected to the second slider 316 by a spring 315. When the slider 314 moves away from the second clamping plate 2, the spring 315 is stretched to generate an outward pulling force. This pulling force acts on the first clamping plate 1 through the second slider 316, so that a clamping force is generated between the first clamping plate 1 and the second clamping plate 2, thereby firmly clamping the aluminum plate fin 4 therebetween. On the contrary, when the aluminum plate fin 4 needs to be loosened, only the second knob 313 needs to be turned to move the slider 314 toward the second clamping plate 2. At this time, the pulling force of the spring 315 will gradually decrease, and the clamping force between the first clamping plate 1 and the second clamping plate 2 will also decrease accordingly, until it reaches a level where the aluminum plate fin 4 can be easily pulled out. In this way, the connection assembly 3 cleverly utilizes the tension of the spring 315 to achieve the clamping and installation operation of the first clamping plate 1 and the second clamping plate 2. At the same time, by turning the second knob 313 to control the position of the slider 314, the tension of the spring 315 can be easily adjusted, thereby achieving precise control of the clamping force of the aluminum plate fin 4. This design not only simplifies the installation and disassembly process, but also improves the convenience and accuracy of the operation.

[0036] In this embodiment, a screw connection 5 is provided at the other end of the second screw rod 312, and the screw connection 5 includes a rotating wheel 503, which is rotatably installed at the other end of the second screw rod 312. The rotating wheel 503 passes through the second screw rod 312 and is fixedly connected to a limiting plate 502. The side of the limiting plate 502 away from the rotating wheel 503 is fixedly connected to a third screw rod 501, and the third screw rod 501 is screwed to the first clamping plate 1.

[0037] When the user needs to release the connection between the first clamping plate 1 and the second clamping plate 2, he only needs to rotate the limit plate 502, thereby driving the rotation of the third screw rod 501. Since the third screw rod 501 is screwed to the first clamping plate 1, rotating the third screw rod 501 will loosen the screw connection between the third screw rod 501 and the first clamping plate 1, thereby allowing the first clamping plate 1 to move relative to the second clamping plate 2. In this way, the user can easily release the connection between the first clamping plate 1 and the second clamping plate 2, which is convenient for subsequent disassembly or maintenance operations.

[0038] Working principle of the aluminum plate-fin heat exchanger: First, make sure that the first clamping plate 1 and the second clamping plate 2 are ready and that the structures of the two are exactly the same. Check whether the slot 202 on the inner side of the plate body 201 is clean and intact, and make sure that the aluminum plate fin 4 is intact. Place the aluminum plate fins 4 one by one in the slot 202 of the second clamping plate 2, and make sure that each plate fin is firmly inserted into the slot 202. Align the first clamping plate 1 with the second clamping plate 2 so that the slot 202 on the first clamping plate 1 is aligned with the aluminum plate fin 4 in the second clamping plate 2. At this time, the first fixed tube 301 will correspond to the first slide bar 304. Slide the first slide bar 304 into the first fixed tube 301. Then, turn the first knob 303 to drive the first screw 302 to rotate. Since the first screw rod 302 and the first slide rod 304 are in a threaded connection, when the first screw rod 302 rotates, the first slide rod 304 will slide in the first fixed tube 301 and gradually approach the second clamping plate 2 until the first clamping plate 1 and the second clamping plate 2 are tightly fitted and the aluminum plate fin 4 is firmly clamped therebetween. Confirm that all aluminum plate fins 4 are evenly and firmly clamped between the first clamping plate 1 and the second clamping plate 2 without looseness or misalignment.

[0039] When part of the aluminum plate fin 4 is damaged, first, rotate the first knob 303 in the opposite direction to rotate the first screw 302 and loosen the fixation of the first slide bar 304. At this time, the first slide bar 304 can slide in the first fixed tube 301. Separate the first clamping plate 1 and the second clamping plate 2: Slide the first slide bar 304 away from the second clamping plate 2 until the clamping force between the first clamping plate 1 and the second clamping plate 2 disappears. Then, remove the first clamping plate 1 from the aluminum plate fin 4. Replace or repair the aluminum plate fin 4: Check the aluminum plate fin 4 to determine which ones need to be repaired or replaced. For damaged plate fins, they can be directly taken out from the slot 202 and replaced with new plate fins; for plate fins that need to be repaired, corresponding repair operations can be performed. Reinstall the aluminum plate fin 4: Put the repaired or replaced aluminum plate fin 4 back into the slot 202 of the second clamping plate 2, and then use the connection assembly 3 to fix the first clamping plate 1 and the second clamping plate 2 according to the steps of the installation process to ensure that the aluminum plate fin 4 is firmly clamped. The user can easily repair the aluminum plate fin 4 individually or replace it as a whole, which greatly improves the convenience and efficiency of maintenance. At the same time, this design also reduces the risk of damage caused by collision during transportation or use, and enhances the durability and reliability of the heat exchanger.

[0040] It is understood that the present invention is described by some embodiments, and those skilled in the art are aware that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. An aluminum plate-fin heat exchanger, comprising a first clamping plate (1) and a second clamping plate (2), characterized in that: The first clamping plate (1) and the second clamping plate (2) have the same structure. The second clamping plate (2) comprises a plate body (201). A plurality of slots (202) are provided on the inner side of the plate body (201). The slots (202) in the plate body (201) of the first clamping plate (1) and the slots (202) in the second clamping plate (2) are clamped and installed with a plurality of aluminum plate fins (4) via a connecting component (3). The connecting component (3) comprises a first fixing tube (301). The first fixing tube (301) is fixed to the plate body (201) of the second clamping plate (2). 201), a first slide bar (304) is slidably installed on the side of the first fixed tube (301) away from the second clamping plate (2), and one end of the first slide bar (304) away from the first fixed tube (301) is fixedly connected to the first clamping plate (1), and a first screw rod (302) is rotatably installed inside the first fixed tube (301), and the first screw rod (302) is externally screwed to the first slide bar (304), and one end of the first screw rod (302) passes through the second clamping plate (2) and is fixedly connected to the first knob (303).

2. The aluminum plate-fin heat exchanger according to claim 1, characterized in that: An opening (203) is provided at the lower portion of the slot (202) of the plate body (201), and the lower portion of the aluminum plate fin (4) extends through the opening (203) to the outside.

3. The aluminum plate-fin heat exchanger according to claim 1, characterized in that: The connection assembly (3) further comprises a second fixing tube (311), wherein the second fixing tube (311) is fixed to the inner side of the plate body (201) of the second clamping plate (2).

4. The aluminum plate-fin heat exchanger according to claim 3, characterized in that: A second sliding rod (316) is slidably mounted on the side of the second fixed tube (311) away from the second clamping plate (2); and one end of the second sliding rod (316) away from the second fixed tube (311) is fixedly connected to the second clamping plate (2).

5. The aluminum plate-fin heat exchanger according to claim 4, characterized in that: A second screw rod (312) is rotatably mounted inside the second fixed tube (311), a slider (314) is screwed onto the outside of the second screw rod (312), a guide rod (317) is fixedly connected to the inside of the second fixed tube (311), the guide rod (317) is slidably fitted with the slider (314) and the second slider (316) respectively, the slider (314) is connected to the second slider (316) via a spring (315), and one end of the second screw rod (312) passes through the second clamping plate (2) and is fixedly connected to a second knob (313).

6. The aluminum plate-fin heat exchanger according to claim 5, characterized in that: A screw connection member (5) is provided at the other end of the second screw rod (312), and the screw connection member (5) includes a rotating wheel (503). The rotating wheel (503) is rotatably mounted on the other end of the second screw rod (312), and the rotating wheel (503) passes through the second screw rod (312) and is fixedly connected to a limiting plate (502). A third screw rod (501) is fixedly connected to the side of the limiting plate (502) away from the rotating wheel (503), and the third screw rod (501) is screwed to the first clamping plate (1).

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