An apparatus for stretching an air equivalent membrane

Abstract

The application relates to the field of ionization chambers, and provides a device for stretching an air equivalent film, which comprises a workbench, a first clamp and a second clamp, the workbench is used for laying the air equivalent film; the first clamp is arranged on the workbench and is used for fixing a first end of the air equivalent film on the workbench; the second clamp comprises an adjusting piece, a pressing piece and a moving piece, the pressing piece is used for pressing a second end of the air equivalent film onto the moving piece, the moving piece can move relative to the workbench, the adjusting piece is connected with the moving piece, and the adjusting piece is adjusted to drive the moving piece to move, wherein the first end and the second end are two opposite ends of the air equivalent film. The device for stretching the air equivalent film can improve the flatness of the air equivalent film.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of ionization chambers, and in particular to a device for stretching an air-equivalent film. BACKGROUND

[0002] In order to realize absolute testing of air kerma strength of a brachytherapy particle source, a large volume extrapolation ionization chamber is designed by many institutions. The ionization chamber mainly includes a beam limiting aperture, an ionization chamber "incident window"-high voltage thin film, an ionization chamber "back window"-collecting thin film and protective thin film, a grid, necessary support structure and signal processing system. The high voltage thin film, the collecting thin film and the protective thin film are all air-equivalent films, which need to have air-equivalence, that is, have the same effective molecular sequence, linear attenuation coefficient and stopping power as air.

[0003] In order to reduce the attenuation of photons and meet the range of the maximum energy electron generated by the interaction of photons and air, so as to ensure the equilibrium condition of the particle, the flatness of the air-equivalent film needs to be controlled within a certain range. In the related art, the air-equivalent film is stretched by manpower and then fixed, which is easy to cause wrinkles and low flatness. SUMMARY

[0004] Therefore, the embodiments of the present application aim to provide a device for stretching an air-equivalent film to improve the flatness of the air-equivalent film.

[0005] In order to achieve the above-mentioned purpose, the technical scheme of the embodiments of the present application is as follows:

[0006] The embodiments of the present application disclose a device for stretching an air-equivalent film, comprising:

[0007] a working platform, configured to lay the air-equivalent film;

[0008] a first clamp, disposed on the working platform, configured to fix a first end of the air-equivalent film on the working platform;

[0009] a second clamp, comprising an adjusting member, a pressing member and a moving member, the pressing member being configured to press a second end of the air-equivalent film onto the moving member, the moving member being movable relative to the working platform, the adjusting member being connected with the moving member, and the adjusting member being adjusted to drive the moving member to move, wherein the first end and the second end are opposite ends of the air-equivalent film.

[0010] In an embodiment, the first clamp comprises:

[0011] a pressing strip, the first end of the air-equivalent film being clamped between the working platform and the pressing strip;

[0012] a first pressing buckle, at least a part of the first pressing buckle is located above the pressing strip, and the first pressing buckle is pressed to compress the pressing strip.

[0013] In an embodiment, the first pressing buckle is provided in a plurality, and the plurality of first pressing buckles are arranged at intervals along the length direction of the pressing strip.

[0014] In an embodiment, the first clamp comprises a fixing seat arranged on the working platform, the fixing seat is located on the side of the pressing strip away from the air equivalent film, and the first pressing buckle is arranged on the fixing seat.

[0015] In an embodiment, the working platform comprises a base and a bottom plate, the bottom plate is located on the upper surface of the base, the upper surface of the bottom plate is used for laying the air equivalent film, and the surface roughness of the bottom plate is less than 10 μm.

[0016] In an embodiment, the second clamp comprises a positioning seat and a plurality of elastic members, the positioning seat is arranged on the working platform, the elastic members connect the moving member and the positioning seat, and at least one elastic member is arranged on both sides of the length direction of the moving member.

[0017] In an embodiment, the adjusting member comprises an adjusting screw, the positioning seat is formed with an adjusting hole, the adjusting screw passes through the adjusting hole and is connected with the moving member, the adjusting screw is threadedly matched with the adjusting hole, and the adjusting screw is rotated to drive the moving member to move.

[0018] In an embodiment, the adjusting member comprises an adjusting wheel, and the adjusting wheel is connected with the end of the adjusting screw away from the moving member.

[0019] In an embodiment, the adjusting member is located in the central region of the moving member.

[0020] In an embodiment, the device comprises a guide member, at least one side of the length direction of the moving member is provided with the guide member, one of the guide member and the moving member is formed with a guide groove, the other of the guide member and the moving member is formed with a guide part, and the guide part is slidably matched with the guide groove.

[0021] In an embodiment, both sides of the length direction of the moving member are provided with the guide member, a stepped surface is formed on the part of the top surface of the moving member between the two guide members, and the compressing member is placed on the stepped surface.

[0022] In an embodiment, the second clamp comprises a second pressing buckle, the second pressing buckle is fixedly arranged on the moving member, at least a part of the second pressing buckle is located above the compressing member, and the second pressing buckle is pressed to compress the compressing member.

[0023] In an embodiment, the moving piece is provided with a plurality of mounting positions distributed along the length direction of the moving piece, and the number of the second buckles is plural, each of the second buckles is selectively mounted on one of the mounting positions.

[0024] In an embodiment, the number of the second clamps and the number of the first clamps are both two, each of the first clamps cooperates with the second clamp on the opposite side to stretch the air equivalent film in the length direction and the width direction.

[0025] The embodiments of the present application disclose a device for stretching an air equivalent film. The air equivalent film is laid on a workbench, and the thickness of the air equivalent film is microns. Non-uniform stretching of the air equivalent film can easily damage the air equivalent film, and cause damage to the conductive layer. Two ends of the air equivalent film are fixed by a first clamp, a pressing piece and a moving piece, and then the moving piece is moved by an adjusting piece. On the one hand, the fixing problem of the air equivalent film of the ionization chamber can be solved, and the air equivalent film is stretched conveniently. The adjusting piece can uniformly apply force to the air equivalent film, and the flatness is high. On the other hand, the moving piece is moved by the adjusting piece, the stretching work efficiency of the air equivalent film is improved, and damage caused by improper manual operation is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 A structural schematic diagram of a device for stretching an air equivalent film is provided in the embodiments of the present application.

[0027] REFERENCE SIGNS

[0028] Device 100; workbench 1; base 11; bottom plate 12; first clamp 2; first buckle 21; fixing seat 22; second clamp 3; adjusting piece 31; adjusting screw 311; adjusting wheel 312; moving piece 32; guide part 32a; step surface 32b; mounting position 32c; positioning seat 33; elastic piece 34; second buckle 35; guide piece 4; guide groove 4a. DETAILED DESCRIPTION

[0029] It should be noted that the embodiments in the present application and the technical features in the embodiments can be combined with each other without conflict, and the detailed description in the specific embodiments should be understood as the explanation and description of the purpose of the present application, and should not be regarded as improper limitation of the present application.

[0030] The application will be described in further detail below with reference to the drawings and specific embodiments. The "first", "second", and the like in the embodiments of the application are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly including at least one feature. In the description of the embodiments of the application, the meaning of "a plurality of" is at least two, such as two, three, and the like, unless otherwise explicitly specified.

[0031] The following is an example of stretching the air equivalent film in the main body of the ionization chamber. The air equivalent film can be a high voltage thin film, a collector thin film, or a protection thin film.

[0032] The embodiments of the application provide a device for stretching an air equivalent film. Referring to Figure 1 , the device 100 includes a workbench 1, a first clamp 2, and a second clamp 3. The workbench 1 is used to lay the air equivalent film. The first clamp 2 is arranged on the workbench 1 and is used to fix the first end of the air equivalent film on the workbench 1. The second clamp 3 includes an adjusting member 31, a pressing member, and a moving member 32. The pressing member is used to press the second end of the air equivalent film onto the moving member 32. The moving member 32 is movable relative to the workbench 1. The adjusting member 31 is connected with the moving member 32. The adjusting member 31 is adjusted to drive the workbench 1 to move. The adjusting member 31 is connected with the moving member 32. The adjusting member 31 is adjusted to drive the moving member 32 to move. The first end and the second end are opposite ends of the air equivalent film.

[0033] The air equivalent film has a conductive layer on one side in the thickness direction of the air equivalent film. The conductive layer is used for conduction. For example, when the air equivalent film is a high voltage thin film, the conductive layer on one side of the air equivalent film is used to access high voltage. When the air equivalent film is a collector thin film, the conductive layer on one side of the air equivalent film is used to introduce a current signal into an electrometer. When the air equivalent film is a protection thin film, the conductive layer on one side of the air equivalent film is used for grounding.

[0034] It should be noted that the reason for using a single-sided conductive layer is to reduce the thickness of the air equivalent film.

[0035] In an embodiment, the material of the conductive layer can be selected from air equivalent materials with conductivity, such as graphite or aluminum.

[0036] The embodiment spreads the air equivalent film on the workbench 1, and the thickness of the air equivalent film is in the order of microns. Uneven stretching of the air equivalent film can easily damage the air equivalent film and cause damage to the conductive layer. The first clamp 2, the pressing member and the moving member 32 are used to fix the two ends of the air equivalent film, respectively. Then, the moving member 32 is moved by adjusting the adjusting member 31. In this way, on the one hand, the fixing problem of the air equivalent film of the ionization chamber can be solved, and the stretching is facilitated. The adjusting member 31 can uniformly apply force to the air equivalent film, and the flatness is high. On the other hand, the moving member 32 is moved by the adjusting member 31, which can improve the stretching work efficiency of the air equivalent film and reduce the damage caused by improper manual operation.

[0037] For example, in an embodiment, the material of the air equivalent film can be PET (polyethylene terephthalate plastic), kapton material (polyimide (PI) film material) or polyethylene.

[0038] For example, in an embodiment, the other side of the air equivalent film along the thickness direction is an insulating side, and the insulating side is in contact with the workbench 1. In this way, the conductive layer is prevented from being damaged during stretching.

[0039] For example, in an embodiment, the thickness of the air equivalent film ranges from 10 μm to 30 μm. For example, the thickness of the air equivalent film can be 10 μm, 15 μm, 20 μm, 25 μm or 30 μm, etc.

[0040] In an embodiment, please refer to Figure 1 The first clamp 2 includes a pressing strip and a first pressing buckle 21, and the first end of the air equivalent film is clamped between the workbench 1 and the pressing strip. For example, the shape of the pressing strip is not limited, for example, the shape of the pressing strip can be a long strip, which can uniformly apply force to the air equivalent film and press it tightly, so as to improve the flatness of the air equivalent film during stretching. At least part of the first pressing buckle 21 is located above the pressing strip, and the first pressing buckle 21 is pressed to press the pressing strip. In this way, the first end of the air equivalent film is fixed by the combination of the pressing strip and the first pressing buckle 21. On the one hand, since the force applying object (the first pressing buckle 21) does not directly contact the target object (the air equivalent film), the damage to the air equivalent film can be reduced. On the other hand, the pressing buckle is used to press, which is also convenient for fixing and disassembling the air equivalent film.

[0041] In an embodiment, please refer to Figure 1The first buckles 21 are provided on the fixed seat 22. Exemplarily, the first buckles 21 can be connected with the fixed seat 22 in a screwing, clamping or welding manner, for example, the first buckles 21 are provided with third installation holes, and the fixed seat 22 is provided with fourth installation holes, and the first buckles 21 can be fixed on the fixed seat 22 by means of screws or bolts penetrating through the third installation holes and the fourth installation holes, so that the design height of the first buckles 21 can be reduced when the pressing strip is pressed.

[0042] In an embodiment, please refer to Figure 1 The first clamp 2 comprises a fixed seat 22 provided on the working platform 1, and the fixed seat 22 is located on the side of the pressing strip away from the air equivalent film. Exemplarily, the shape of the fixed seat 22 is not limited, for example, the shape of the fixed seat 22 can be a cuboid; the setting position of the fixed seat 22 is not limited, for example, the fixed seat 22 can be arranged at the edge of one side of the working platform 1; and the fixing mode of the fixed seat 22 on the working platform 1 can be screwing, welding or clamping, for example, the working platform 1 is provided with first installation holes, and the fixed seat 22 is provided with second installation holes, and the fixed seat 22 can be fixed on the working platform 1 by means of screws or bolts penetrating through the first installation holes and the second installation holes, so that the strength of the working platform 1 can be improved, and the working stability can be improved.

[0043] The first buckles 21 are provided on the fixed seat 22. Exemplarily, the first buckles 21 can be connected with the fixed seat 22 in a screwing, clamping or welding manner, for example, the first buckles 21 are provided with third installation holes, and the fixed seat 22 is provided with fourth installation holes, and the first buckles 21 can be fixed on the fixed seat 22 by means of screws or bolts penetrating through the third installation holes and the fourth installation holes, so that the design height of the first buckles 21 can be reduced when the pressing strip is pressed.

[0044] In an embodiment, the material of the pressing strip is 304 stainless steel. In this way, the 304 stainless steel has the characteristics of low surface roughness and no rust, so that the damage to the air equivalent film can be reduced.

[0045] In an embodiment, please refer to Figure 1 The working platform 1 comprises a base 11 and a bottom plate 12, and the bottom plate 12 is located on the upper surface of the base 11, the upper surface of the bottom plate 12 is used for laying the air equivalent film, and the surface roughness of the bottom plate 12 is less than 10 μm. Exemplarily, the surface roughness of the bottom plate 12 can be 10 μm, 1 μm or 0.1 μm, etc., so that the damage to the air equivalent film can be reduced when stretched, and the flatness of the air equivalent film can be improved.

[0046] Exemplarily, in an embodiment, the shape of the base 11 is not limited, for example, the shape of the base 11 can be a cuboid or a square.

[0047] Exemplarily, in an embodiment, the shape of the bottom plate 12 is not limited, for example, the shape of the bottom plate 12 can be rectangular or square, etc., and the shape of the air equivalent film is used as a reference.

[0048] Exemplarily, in an embodiment, the bottom plate 12 can be PMMA (organic glass), which has low surface roughness, high strength and low cost.

[0049] Exemplarily, in an embodiment, the material of the base 11 can be wood, which can further reduce the overall weight of the device 100.

[0050] In an embodiment, referring to Figure 1 , the second clamp 3 includes a positioning seat 33 and a plurality of elastic members 34, and the positioning seat 33 is arranged on the workbench 1. Exemplarily, the shape of the positioning seat 33 is not limited, for example, the shape of the positioning seat 33 is approximately strip-shaped; the connection mode of the positioning seat 33 and the workbench 1 can be screwing, clamping or welding, etc., for example, a fifth mounting hole is formed on the positioning seat 33, and a sixth mounting hole is formed on the workbench 1, and a bolt or a screw, etc. can pass through the fifth mounting hole and the sixth mounting hole to fix the positioning seat 33 on the workbench 1, which can further improve the strength of the workbench 1 and improve the working stability.

[0051] The elastic member 34 connects the moving member 32 and the positioning seat 33, and at least one elastic member 34 is arranged on both sides of the length direction of the adjusting member 31. Exemplarily, the number of the elastic member 34 is not limited, for example, the number of the elastic member 34 can be 6, and 3 elastic members 34 are arranged on both sides of the length direction of the adjusting member 31. In this way, the tension of the moving member 32 to stretch the air equivalent film can be in a uniform state, and the second end of the air equivalent film can be ensured to be subjected to a good uniform force, so as to further improve the flatness of the air equivalent film.

[0052] In an embodiment, referring to Figure 1 , the adjusting member 31 includes an adjusting screw 311, the positioning seat 33 is formed with an adjusting hole, the adjusting screw 311 passes through the adjusting hole and is connected with the moving member 32, the adjusting screw 311 is threadedly matched with the adjusting hole, and the adjusting screw 311 is rotated to drive the moving member 32 to move. Exemplarily, a spring retainer can be arranged in the moving member 32, and the adjusting screw 311 passes through the adjusting hole and is arranged in the spring retainer, so that the adjusting screw 311 can rotate in the axial direction without being separated from the moving member 32. In this way, the size of the tension can be accurately controlled by the thread matching mode, and the flatness of the air equivalent film and the thickness thereof can be controlled.

[0053] In an embodiment, referring to Figure 1The adjusting member 31 comprises an adjusting wheel 312 connected to the end of the adjusting screw 311 away from the moving member 32. In this way, the displacement of the moving member 32 can be adjusted more conveniently without the need of other auxiliary tools, and the operation is simple.

[0054] In an example, the adjusting wheel 312 comprises a ring-shaped handle with a scale of displacement values, so that when facing the same batch of air equivalent films, the specified scale position can be directly turned to, so as to reduce the operation steps.

[0055] It can be understood that in some examples, the ring-shaped handle can be manually held to rotate the adjusting member 31. In other examples, the adjusting member 31 can also be driven to rotate by a motor.

[0056] In an example, the adjusting member 31 is located in the central region of the moving member 32. In an example, one end of the adjusting member 31 is connected to the middle position of the moving member 32 along the length direction, so that when the adjusting member 31 drives the moving member 32, the force is applied to the middle of the moving member 32, which can avoid uneven force.

[0057] The central region can be the intersection of the central position of the length direction and the central position of the height direction, i.e., the up and down direction, of the moving member 32.

[0058] In an example, referring to Figure 1 The device 100 comprises a guide member 4, at least one side of the length direction of the moving member 32 is provided with the guide member 4, one of the guide member 4 and the moving member 32 is formed with a guide groove 4a, the other of the guide member 4 and the moving member 32 is formed with a guide portion 32a, and the guide portion 32a and the guide groove 4a are in sliding fit. In an example, the guide member 4 can be formed with the guide groove 4a, the slot of the guide groove 4a is close to the moving member 32, the moving member 32 is formed with the guide portion 32a, and the guide portion 32a is located in the guide groove 4a, so that when the adjusting member 31 drives the moving member 32 to move, the moving member 32 can move along the guide direction of the guide groove 4a, so as to avoid the bending and wrinkling of the air equivalent film when it is stretched, and further improve the flatness of the air equivalent film.

[0059] In some examples, referring to Figure 1 Both sides of the length direction of the moving member 32 are formed with the guide groove 4a, the guide member 4 is formed with the guide portion 32a, and the adjusting member 31 drives the moving member 32 to move along the guide direction.

[0060] In an example, the guide portion 32a can be a boss matched with the shape of the guide groove 4a. In other examples, the guide portion 32a can also be a roller rolling in the guide groove 4a.

[0061] In an embodiment, referring to Figure 1 The moving member 32 is provided with the guide member 4 on both sides in the length direction, and a stepped surface 32b is formed on the top surface of the moving member 32 between the two guide members 4, and the pressing member is placed on the stepped surface 32b. For example, the pressing member is matched with the size of the stepped surface 32b, so that the air equivalent film is placed on the stepped surface 32b, and the pressing member is placed on the stepped surface 32b, and the precise positioning of the pressing member and the stepped surface 32b can increase the fixing pressure of the air equivalent film.

[0062] In an embodiment, the material of the pressing member is 304 stainless steel. In this way, the surface roughness is low, which can reduce the damage to the air equivalent film.

[0063] In an embodiment, referring to Figure 1 The second clamp 3 includes a second pressing buckle 35, which is fixedly arranged on the moving member 32. For example, the connection mode of the second pressing buckle 35 and the moving member 32 can be screwing, clamping or welding, etc. For example, the first pressing buckle 21 is provided with a seventh mounting hole, and the moving member 32 is provided with an eighth mounting hole, and a screw or a bolt can pass through the seventh mounting hole and the eighth mounting hole to fix the second pressing buckle 35 on the moving member 32. At least part of the second pressing buckle 35 is located above the pressing member, and the second pressing buckle 35 is pressed to press the pressing member. In this way, the second end of the air equivalent film is fixed by the combination of the pressing member and the second pressing buckle 35. On the one hand, since the force applying object (the second pressing buckle 35) does not directly contact the target object (the air equivalent film), the damage to the air equivalent film can be reduced. On the other hand, the pressing buckle is used for pressing, which is convenient for fixing and disassembling the air equivalent film.

[0064] In an embodiment, referring to Figure 1 The moving member 32 is provided with a plurality of mounting positions 32c distributed along the length direction, and the number of the second pressing buckles 35 is plural, and each second pressing buckle 35 is selectively arranged on one of the mounting positions 32c. For example, the number of the mounting positions 32c and the second pressing buckles 35 is not limited, and for example, the number of the mounting positions 32c can be five, and the number of the second pressing buckles 35 can be four. In this way, according to the size of the air equivalent film, the appropriate mounting position 32c and the corresponding number of the second pressing buckles 35 can be selected to fix the air equivalent film, and the selection is flexible.

[0065] In an embodiment, referring to Figure 1 The number of the second clamp 3 and the first clamp 2 is two, and each first clamp 2 cooperates with the second clamp 3 on the opposite side to stretch the air equivalent film in the length direction and the width direction. In this way, the air equivalent film can be stretched in two directions, so that the thickness and flatness of the air equivalent film meet the requirements, so as to reduce the attenuation of the photons and meet the balance of the charged particles.

[0066] For example, in one embodiment, the high-voltage ultra-thin film is fixed by the following steps: firstly, the double-sided adhesive tape is attached to the insulating ring fixed on the high-voltage ultra-thin film, then the insulating ring with the double-sided adhesive tape is attached to the air equivalent film, and finally the air equivalent film is fixed to the insulating ring by the insulating screw, and the air equivalent film is cut along the outer periphery of the insulating ring.

[0067] It should be noted that the peripheral mechanical components fixed on the air equivalent film are not in conductive communication with the air equivalent film, and need to be separated by the insulating ring and the insulating screw.

[0068] The above description is only the preferred embodiment of the present application, and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application is included in the protection scope of the present application.

Claims

1. An apparatus for stretching an air- equivalent membrane, characterized by, The utility model relates to an air equivalent film stretching device, comprising: a work platform for laying the air equivalent film, the air equivalent film has a conductive layer along one side in the thickness direction, the other side in the thickness direction is an insulating side, the thickness of the air equivalent film is between 10-30 microns, wherein the work platform comprises a base and a bottom plate, the bottom plate is located on the upper surface of the base, the insulating side is laid on the upper surface of the bottom plate, and the surface roughness of the bottom plate is less than 10 microns; a first clamp is arranged on the work platform, the first clamp comprises a pressing strip and a first pressing buckle, the first end of the air equivalent film is clamped between the work platform and the pressing strip, at least part of the first pressing buckle is located above the pressing strip, and the first pressing buckle is pressed to compress the pressing strip, wherein the material of the pressing strip is 304 stainless steel; a second clamp comprises an adjusting piece, a compression piece, a moving piece, a positioning seat and a plurality of elastic pieces, the compression piece is used for compressing the second end of the air equivalent film to the moving piece, the moving piece can move relative to the work platform, the adjusting piece is located in the central region of the moving piece, the adjusting piece is adjusted to drive the moving piece to move, the central region is the intersection region of the central region in the length direction and the central position in the height direction of the moving piece, the positioning seat is arranged on the work platform, the elastic piece connects the moving piece and the positioning seat, at least one elastic piece is arranged on both sides of the adjusting piece along the length direction of the moving piece, wherein the first end and the second end are opposite ends of the air equivalent film, the material of the compression piece is 304 stainless steel, both sides of the length direction of the moving piece are provided with guide pieces, the top surface of the moving piece forms a stepped surface between the two guide pieces, and the compression piece is placed on the stepped surface; the number of the first clamp and the second clamp is both 2, each first clamp cooperates with the second clamp on the opposite side to stretch the air equivalent film in the length direction and the width direction.

2. The apparatus of claim 1, wherein, The number of the first pressing buckle is a plurality, and a plurality of first pressing buckles are arranged at intervals along the length direction of the pressing strip.

3. The apparatus of claim 1, wherein, The first clamp comprises a fixing seat arranged on the work platform, the fixing seat is located on the side of the pressing strip away from the air equivalent film, and the first pressing buckle is arranged on the fixing seat.

4. The apparatus of claim 1, wherein, The adjusting piece comprises an adjusting screw, the positioning seat forms an adjusting hole, the adjusting screw passes through the adjusting hole and is connected with the moving piece, the adjusting screw is screwed with the adjusting hole, and the adjusting screw is rotated to drive the moving piece to move.

5. The apparatus of claim 4, wherein, The adjusting piece comprises an adjusting wheel, and the adjusting wheel is connected with one end of the adjusting screw away from the moving piece.

6. The apparatus of claim 1, wherein, One of the guide piece and the moving piece forms a guide groove, and the other of the guide piece and the moving piece forms a guide part, and the guide part and the guide groove are in sliding cooperation.

7. The apparatus of claim 1, wherein, The second clamp comprises a second pressing buckle fixedly arranged on the moving part, at least part of the second pressing buckle is located above the pressing part, and the second pressing buckle is pressed to press the pressing part.

8. The apparatus of claim 7, wherein, A plurality of mounting positions are formed on the moving part and spaced along the length direction of the moving part, and the number of the second pressing buckles is plural, and each second pressing buckle is selectively mounted on one of the mounting positions.

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