Combined plastic film leak detector

Abstract

The application discloses a combined plastic film leak detection device, which comprises a shell, a variable speed transmission mechanism and a leak detection mechanism. The variable speed transmission mechanism is arranged on the shell, and a negative pressure clamping mechanism is arranged on the variable speed transmission mechanism. The leak detection mechanism is arranged at the middle position of the variable speed transmission mechanism. The negative pressure clamping mechanism clamps the film through negative pressure, and the film is stretched through the variable speed transmission mechanism. The leak detection mechanism detects the stretched film. The variable speed transmission mechanism makes the negative pressure clamping mechanism stretch the film in the horizontal direction through variable speed, and makes the negative pressure clamping mechanism stretch the film in the vertical direction through a guide rail during transmission, so that the film is completely stretched. The leak detection mechanism detects the film through the chemical reaction between the solution and the gas, so that the film is detected during transmission. The application has the effect of uninterrupted film detection.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of plastic film leak detection, in particular to a combined plastic film leak detection device. BACKGROUND

[0002] In industry, in order to meet the zero-pore tolerance requirement of plastic film, such as proton exchange membrane for flow battery, fuel cell, carbon plate, etc., it is usually necessary to detect the leak of the above-mentioned film.

[0003] For example, the proton exchange membrane fuel cell bipolar plate plays a role in transmitting fuel gas, oxidant and heat dissipation during the operation of the stack, and thus contains three conducting parts of fuel gas, oxidant and coolant. The fuel gas is generally hydrogen, the oxidant is generally air, and the coolant is generally water. The coolant conducting part is located between the oxidant and the fuel gas conducting part, and the sealing between the coolant conducting part and the fuel gas and oxidant conducting parts needs to be ensured during use, otherwise it will cause gas overflow. If hydrogen and air are mixed, it will cause a fire hazard and even explosion. Therefore, the detection of film pores is particularly important.

[0004] In the prior art, for example, the "leak detection device and method for film" introduced in Chinese patent application publication No. CN102297748A includes a base with a groove, a hole plate or a steel mesh as a support, and a hollow annular cover. The inner wall of the groove is provided with an air inlet hole penetrating the base. The annular cover is locked with the base by bolts and nuts, and the hole plate or steel mesh is pressed between the base and the annular cover. The external pressure gauge introduces air into the groove through the air inlet hole of the base, and detects the film by air pressure method.

[0005] For the above-mentioned patent, although the film leak detection device has made certain breakthroughs in structure design and use performance, it still has some shortcomings, such as although the film product can be detected by air pressure, the time is long, the efficiency is low, the detection cost is high, the precision is poor, the position with pores cannot be marked, and the film cannot be continuously and in large quantities. The detection of the material is easy to damage the measured material, and cannot meet the needs of industrialized mass production. SUMMARY

[0006] The purpose of the present application is to provide a combined plastic film leak detection device to solve the problems in the background art.

[0007] In order to solve the above technical problems, the present application provides the following technical solutions: a combined plastic film leak detection device, comprising a shell, a variable speed transmission mechanism and a leak detection mechanism, the variable speed transmission mechanism is arranged on the shell, a negative pressure clamping mechanism is arranged on the variable speed transmission mechanism, the leak detection mechanism is arranged at the middle position of the variable speed transmission mechanism, the negative pressure clamping mechanism clamps the film through negative pressure, the negative pressure clamping mechanism stretches the film through the variable speed transmission mechanism, and the leak detection mechanism detects the stretched film. The variable speed transmission mechanism stretches the film in the horizontal direction through variable speed, and stretches the film in the vertical direction through the guide rail during transmission, so that the film is completely stretched, and the leak detection mechanism detects the film through the chemical reaction of the solution and the gas, so that the film is detected during transmission. The present application has the effect of uninterrupted film testing.

[0008] As a preferred technical solution, the variable speed transmission mechanism comprises two groups of variable speed transmission boxes, the two groups of variable speed transmission boxes are arranged on both sides inside the shell, each group of variable speed transmission boxes comprises a plurality of groups of transmission shafts, the negative pressure clamping mechanism comprises a plurality of groups of clamping assemblies, the plurality of groups of clamping assemblies are arranged on each group of transmission shafts, and the plurality of groups of clamping assemblies are located between the two groups of variable speed transmission boxes. The variable speed transmission box provides power for the rotation of the transmission shaft, and at the same time, different rotation speeds make the distance between the plurality of groups of transmission shafts be pulled apart, realizing the horizontal stretching of the film. The transmission shaft provides support for the installation of the clamping assembly, so that the clamping assembly circulates in the device. The clamping assembly adsorbs the film through negative pressure, and at the same time, stretches the adsorbed part of the film in the horizontal direction through stretching.

[0009] As a preferred technical solution, the two groups of variable speed transmission boxes are internally provided with a walking guide rail and a transmission belt assembly arranged on the inner side of the walking guide rail, the plurality of groups of transmission shafts are located between the walking guide rail and the transmission belt assembly, and the transmission shaft is rotationally connected with the walking guide rail and the transmission belt assembly. The walking guide rail and the transmission belt assembly cooperate to make the transmission shaft circulate in the device, so that the film can be continuously tested. The walking guide rail provides a basis for the movement of the transmission shaft, and the transmission belt assembly provides power for the movement of the transmission shaft.

[0010] As a preferred technical scheme, each of the plurality of groups of transmission shafts comprises a sleeve, a support shaft arranged inside the sleeve, the sleeve is rotationally connected with the walking guide rail and the conveying belt assembly, the support shaft is provided with a support ring at an end away from the inner wall of the shell, and a rotating ball is arranged in the support ring; a lower support guide rail is arranged on the end face of the variable speed transmission box away from the shell and below the rotating ball, an upper support guide rail is arranged on the side of the conveying belt assembly away from the shell and above the rotating ball, and the rotating ball is rotationally connected with the upper support guide rail and the lower support guide rail. The sleeve provides a basis for the movement of the transmission shaft and supports the installation of the support shaft. The support shaft is rotationally connected with the sleeve, so that the clamping assembly is always in a vertically downward state when the sleeve rotates. The support ring supports the installation of the rotating ball. The support shaft is balanced and supported at the other end through the support ring and the rotating ball. The lower support guide rail and the upper support guide rail provide a track for the rotation of the rotating ball. Through the change of the track, the support shaft moves to the other end, so that the clamping assembly stretches the film to both sides, thereby realizing the longitudinal stretching of the film. Through the stretching in the horizontal and vertical directions, the film is in a state similar to that after being inflated by air, facilitating subsequent leak detection of the film.

[0011] As a preferred technical scheme, each of the plurality of groups of transmission shafts comprises a sleeve, a support shaft arranged inside the sleeve, the sleeve is rotationally connected with the walking guide rail and the conveying belt assembly, the support shaft is provided with a support ring at an end away from the inner wall of the shell, and a rotating ball is arranged in the support ring; a lower support guide rail is arranged on the end face of the variable speed transmission box away from the shell and below the rotating ball, an upper support guide rail is arranged on the side of the conveying belt assembly away from the shell and above the rotating ball, and the rotating ball is rotationally connected with the upper support guide rail and the lower support guide rail. The sleeve provides a basis for the movement of the transmission shaft and supports the installation of the support shaft. The support shaft is rotationally connected with the sleeve, so that the clamping assembly is always in a vertically downward state when the sleeve rotates. The support ring supports the installation of the rotating ball. The support shaft is balanced and supported at the other end through the support ring and the rotating ball. The lower support guide rail and the upper support guide rail provide a track for the rotation of the rotating ball. Through the change of the track, the support shaft moves to the other end, so that the clamping assembly stretches the film to both sides, thereby realizing the longitudinal stretching of the film. Through the stretching in the horizontal and vertical directions, the film is in a state similar to that after being inflated by air, facilitating subsequent leak detection of the film.

[0012] As a preferred technical scheme, the lower end surface of the fast conveying belt is lower than the lower end surface of the slow conveying belt; a gear belt is arranged on the inner wall of the walking guide rail, the gear belt is located outside the slow conveying belt, the gear belt is not connected at both ends and the opening is located below the concave shape of the slow conveying belt, and a connecting gear belt is further arranged on the inner wall of the walking guide rail, the connecting gear belt is located below the fast conveying belt, and the upper end of the connecting gear belt is lower than the upper end of the gear belt. The arrangement of the gear belt and the connecting gear belt provides a basis for the rotation of the transmission shaft, and at the same time, through the arrangement of different positions, the basis for the separation of the transmission shaft from the slow conveying belt and the connection with the fast conveying belt is completed.

[0013] As a preferred technical scheme, each of the plurality of clamping assemblies comprises a bearing plate, the upper end of the bearing plate is fixed with a connecting rod, and a plurality of groups of adsorption shafts are arranged on both sides of the bearing plate, wherein two groups of the adsorption shafts are in sliding connection with the bearing plate, and a plurality of groups of adsorption shafts are in sliding connection with each other, and the lower end of the bearing plate and the lower end of a plurality of groups of the adsorption shafts are provided with friction plates. The bearing plate provides a basis for the installation of the adsorption shaft and the connection with the transmission shaft, the adsorption shaft adsorbs the film through negative pressure, and the connection between the adsorption shaft and the film is enhanced through the friction plate, and the sliding connection between the bearing plate and the adsorption shaft provides support for self-expansion.

[0014] As a preferred technical scheme, the inner ends of the bearing plate are provided with sliding grooves, the side away from the bearing plate of each group of the adsorption shafts is provided with a sliding groove inward, the inner end of each group of the sliding grooves close to the center line of the bearing plate is provided with a telescopic air bag, the side close to the bearing plate of each group of the adsorption shafts is provided with a sliding plate, each group of the sliding plates is embedded in each group of the sliding grooves, and one end of the sliding plate is fixed with the telescopic air bag. The sliding groove provides a basis for the connection between the adsorption shaft and the bearing plate and the adsorption shaft and the adsorption shaft, the sliding plate provides support for the sliding connection, and the telescopic air bag provides power for self-expansion after inflation.

[0015] As a preferred technical scheme, the bearing plate is provided with an adsorption pump and a telescopic pump, the telescopic pump is connected with a pipeline of a plurality of telescopic air bags, each of a plurality of groups of the friction plates is provided with an adsorption disc, and each of a plurality of groups of the adsorption discs is connected with a pipeline of the adsorption pump. The adsorption pump provides power for the adsorption disc to adsorb the film, the telescopic pump provides air power for the expansion of the telescopic air bag, and the adsorption disc provides support for the clamping assembly to adsorb the film.

[0016] As a preferred technical scheme, the leak detection mechanism comprises a liquid storage tank and a gas pressure tank, the liquid storage tank and the gas pressure tank are located between the two groups of variable speed transmission boxes, the liquid storage tank is fixed to the upper end face inside the shell, the gas pressure tank is fixed to the lower end face inside the shell, and the gas pressure tank is located below the plurality of clamping assemblies. The liquid storage tank stores the solution participating in the chemical reaction and sprays the solution to the upper end face of the film, the gas pressure tank is the tank body of the upper end face, the clamping assembly passes through the upper end of the gas pressure tank after adsorbing the film, and the film is tightly attached to the upper end face of the gas pressure tank, so that the gas leakage of the gas pressure tank is prevented, when there is a gas hole on the film, the gas moves to the upper end face of the film from the gas hole and reacts with the solution, so that the color of the solution changes, thereby facilitating the operator to know the position of the gas hole on the film.

[0017] Compared with the prior art, the application has the following beneficial effects:

[0018] 1. In the application, the variable speed transmission mechanism makes the negative pressure clamping mechanism horizontally stretch the film through variable speed transmission, and makes the negative pressure clamping mechanism vertically stretch the film through the guide rail during transmission, so that the film is completely stretched, which is equivalent to completing the effect of making the film swell through air during transmission, shortens the waiting time during the film leakage detection process, and improves the film leakage detection efficiency.

[0019] 2. In the application, the leak detection mechanism detects the stretched film through the solution with color and the gas, when there is a gas hole on the film, the gas contacts the solution and reacts with the solution, so that the color of the solution of the part of the film with the gas hole changes, thereby completing the film leakage detection during transmission, and the device does not need to stop during the film leakage detection process, and the film can be continuously detected, thereby improving the film leakage detection efficiency and meeting the needs of industrial large-scale production.

[0020] 3. In the application, the negative pressure clamping mechanism adsorbs the film through negative pressure, and the position in contact with the film is provided with a rubber pad, which increases the friction between the negative pressure clamping mechanism and the film without damaging the film material, and the self-expansion of the negative pressure clamping mechanism makes the part adsorbed by the negative pressure also be horizontally stretched, so that the adsorbed part of the film also participates in the film leakage detection, and each part of the film can be detected and used subsequently. DETAILED DESCRIPTION

[0021] The accompanying drawings are included to provide a further understanding of the application and constitute a part of the specification, which together with the embodiments of the application serve to explain the application, and do not constitute a limitation on the application. In the drawings:

[0022] Figure 1 is a top view of the overall structure of the application;

[0023] Figure 2It is the whole structure front view half cut schematic diagram of the application;

[0024] Figure 3 It is the whole structure left view schematic diagram of the application;

[0025] Figure 4 It is the inside structure front view schematic diagram of the transmission case of the application;

[0026] Figure 5 It is the whole structure schematic diagram of the negative pressure clamping mechanism of the application;

[0027] Figure 6 It is the extension schematic diagram of the negative pressure clamping mechanism of the application.

[0028] In the figure: 1, the shell; 2, the variable speed transmission mechanism; 3, the negative pressure clamping mechanism; 4, the leak detection mechanism; 2-1, the variable speed transmission case; 2-2, the walking guide rail; 2-3, the sleeve; 2-4, the support shaft; 2-5, the support ring; 2-6, the lower support guide rail; 2-7, the upper support guide rail; 2-8, the mounting plate; 2-9, the slow transmission belt; 2-10, the fast transmission belt; 3-1, the bearing plate; 3-2, the adsorption shaft; 3-3, the friction plate; 3-4, the sliding plate; 3-5, the telescopic air bag; 3-6, the adsorption disc; 4-1, the liquid storage tank; 4-2, the air pressure tank. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the application.

[0030] Please refer to Figures 1-6 The application provides a technical solution: a combined plastic film leak detection device, which comprises a shell 1, a variable speed transmission mechanism 2 and a leak detection mechanism 4. The variable speed transmission mechanism 2 is installed on the shell 1, and the variable speed transmission mechanism 2 is provided with a negative pressure clamping mechanism 3. The leak detection mechanism 4 is installed at the middle position of the variable speed transmission mechanism 2. The negative pressure clamping mechanism 3 clamps the film through negative pressure, and the negative pressure clamping mechanism 3 stretches the film through the variable speed transmission mechanism 2. The leak detection mechanism 4 detects the stretched film.

[0031] The variable speed transmission mechanism 2 comprises two groups of variable speed transmission cases 2-1, which are installed on the left and right sides inside the shell 1. A plurality of groups of transmission shafts are rotatably installed on the two groups of variable speed transmission cases 2-1.

[0032] The walking guide rail 2-2 is fixedly installed in the two groups of variable speed transmission boxes 2-1, and the transmission belt assembly is located in the inner side of the walking guide rail 2-2.

[0033] The two groups of transmission belt assemblies each include two groups of mounting plates 2-8, which are fixedly connected with the two groups of variable speed transmission boxes 2-1, respectively, and the two groups of mounting plates 2-8 are rotatably connected with the slow transmission belt 2-9 and the fast transmission belt 2-10.

[0034] The walking guide rail 2-2 is fixedly installed in the two groups of variable speed transmission boxes 2-1, and the transmission belt assembly is located in the inner side of the walking guide rail 2-2.

[0035] The transmission shafts each include a sleeve 2-3 and a support shaft 2-4 rotatably installed in the sleeve 2-3, and the outer wall of the sleeve 2-3 is provided with a gear.

[0036] The inner wall of the variable speed transmission box 2-1 is provided with a sliding groove corresponding to the position of the support shaft 2-4, which provides space for the outward movement of the support shaft 2-4 when the film is stretched longitudinally.

[0037] The negative pressure clamping mechanism 3 includes a plurality of clamping assemblies, and the plurality of clamping assemblies are located between the two groups of variable speed transmission boxes 2-1.

[0038] The clamping assembly comprises a bearing plate 3-1, the upper end of the bearing plate 3-1 is fixed with the lower end of the connecting rod through a support, three groups of adsorption shafts 3-2 are slidably installed on the left and right sides of the bearing plate 3-1, the three groups of adsorption shafts 3-2 on the left and right sides are slidably connected, and the lower end of the bearing plate 3-1 and the lower end of the six groups of adsorption shafts 3-2 are fixed with friction plates 3-3.

[0039] The end faces on the left and right sides of the bearing plate 3-1 are inwardly machined with sliding grooves, the side away from the bearing plate 3-1 of each group of adsorption shafts 3-2 is inwardly machined with a sliding groove, one end of each group of sliding grooves close to the center line of the bearing plate 3-1 is installed with a telescopic air bag 3-5, a spring is installed in the telescopic air bag 3-5, the spring provides power assistance for the reset of the adsorption shaft 3-2, the side close to the bearing plate 3-1 of each group of adsorption shafts 3-2 is fixed with a sliding plate 3-4, each group of sliding plates 3-4 is embedded in each group of sliding grooves, and one end of the sliding plate 3-4 is fixed with one end of the telescopic air bag 3-5, and the sliding plate 3-4 and the sliding groove are slidably connected.

[0040] The middle part of the bearing plate 3-1 is a hollow structure, and an adsorption pump (not shown in the figure) and a telescopic pump (not shown in the figure) are installed inside.

[0041] The friction plates 3-3 are made of rubber material, the friction plates 3-3 are installed with adsorption discs 3-6, pipes are machined in the adsorption shafts 3-2, and the adsorption discs 3-6 are connected with the adsorption pump through the pipes.

[0042] The leakage detection mechanism 4 comprises a liquid storage tank 4-1 and a gas pressure tank 4-2, the liquid storage tank 4-1 and the gas pressure tank 4-2 are located between the two groups of variable speed transmission boxes 2-1, the liquid storage tank 4-1 is fixed with the upper end face inside the shell 1 through a connecting tank, the liquid storage tank 4-1 stores a solution participating in a chemical reaction, such as a colored ferrous salt solution, the connecting tank is a tank body, and a water pump and a gas pump are installed inside, the gas pump fills gas into the gas pressure tank 4-2, the water pump extracts the solution in the liquid storage tank 4-1 and sprays the solution onto the film through a water spraying pipe, the film at this position is in a state after being stretched in the transverse and longitudinal directions, the gas pressure tank 4-2 is fixed with the lower end face inside the shell 1, the gas pressure tank 4-2 is located below the clamping assemblies, the liquid storage tank 4-1 and the gas pressure tank 4-2 are located at the middle arc positions of the upper support rail 2-7 and the lower support rail 2-6, the gas pressure tank 4-2 is a tank body without an upper end face, and a gas that reacts with the solution to change the color of the solution, such as chlorine, is stored inside.

[0043] The leak detection mechanism 4 further comprises a cleaning assembly (not shown in the figure) installed at one end of the device out of the film, which is composed of a motor, a roller shaft and a sponge, the sponge is fixed on the roller shaft, the roller shaft is placed horizontally, the upper half of the roller shaft has a sponge, and the lower half has no sponge, the cleaning assembly cleans the solution on the upper end surface of the film, when there is no air hole on the film, the motor rotates, the sponge is below the roller shaft, and the sponge cleans the solution, when there is an air hole on the film, the sponge is above the roller shaft, and the sponge does not clean the film, which is convenient for the operator to process the film part containing the air hole.

[0044] The working principle of the present application is as follows:

[0045] When the slow transmission belt 2-9 rotates, the transmission shaft rotates in the variable speed transmission box 2-1, and since the support shaft 2-4 is rotationally connected with the sleeve 2-3, the negative pressure clamping mechanism 3 is always in a vertically downward state.

[0046] The film to be detected for air holes is placed below the negative pressure clamping mechanism 3, the air in the suction disc 3-6 is extracted, so that the suction disc 3-6 adsorbs the film, and the film is adsorbed on the negative pressure clamping mechanism 3, at the same time, the slow transmission belt 2-9 moves the negative pressure clamping mechanism 3 in the device, with the rotation of the slow transmission belt 2-9, the other transmission shafts continuously adsorb and transport the film, so that the film enters the device.

[0047] When the transmission shaft moves to the arc-shaped position of the lower support rail 2-6 and the upper support rail 2-7, the transmission shaft starts to be rotationally connected with the fast transmission belt 2-10, at the same time, the support ring 2-5 moves outward, i.e. moves to one side of the inner wall of the shell 1, under the action of the rotating ball and the lower support rail 2-6 and the upper support rail 2-7, so that the negative pressure clamping mechanism 3 moves outward, so that the film is stretched longitudinally, and since the transmission shaft is rotationally connected with the fast transmission belt 2-10, the transmission shaft is pulled away from the rear transmission shaft, so that the film between the two groups is stretched transversely.

[0048] When the film is stretched to the maximum extent, the liquid tank 4-1 sprays the solution to the upper end surface of the film, and the gas pressure tank 4-2 is filled with gas, which exerts an upward extrusion force on the film, and since the negative pressure clamping mechanism 3 supports the film, the film always adheres to the upper end surface of the gas pressure tank 4-2, thereby ensuring the stability of the gas pressure in the gas pressure tank 4-2.

[0049] When there is an air hole on the film, the gas reacts with the solution on the upper end surface through the air hole, so that the solution in this part changes color, thereby marking the part containing the air hole. When there is no air hole on the film, the cleaning assembly cleans the solution.

[0050] When the transmission shafts are again connected with the slow transmission belt 2-9, the distance between the rear group of transmission shafts and the front group of transmission shafts is shortened, the film is restored laterally, and at the same time, since the middle positions of the lower support guide rail 2-6 and the upper support guide rail 2-7 are arc-shaped, the film is first restored longitudinally when the transmission shafts move towards the film outlet end of the device.

[0051] When the film is output from the device, the adsorption disc 3-6 is filled with air, so that the adsorption disc 3-6 is separated from the film, thereby separating the film from the negative pressure clamping mechanism 3.

[0052] It should be noted that in this document, the terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device.

[0053] Finally, it should be noted that the above description is only for the preferred embodiments of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent replacements to some technical features. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A combined plastic film leak detector, characterized by: The film leak detection device includes a shell (1), a variable speed transmission mechanism (2), and a leak detection mechanism (4). The variable speed transmission mechanism (2) is arranged on the shell (1), and a negative pressure clamping mechanism (3) is arranged on the variable speed transmission mechanism (2). The leak detection mechanism (4) is arranged at the middle position of the variable speed transmission mechanism (2). The negative pressure clamping mechanism (3) clamps the film through negative pressure, and the negative pressure clamping mechanism (3) stretches the film through the variable speed transmission mechanism (2). The leak detection mechanism (4) detects the stretched film. The variable speed transmission mechanism (2) includes two groups of variable speed transmission boxes (2-1), which are arranged on both sides inside the shell (1). Each group of the variable speed transmission boxes (2-1) includes a plurality of groups of transmission shafts. The negative pressure clamping mechanism (3) includes a plurality of groups of clamping assemblies, which are arranged on each group of the transmission shafts and located between the two groups of the variable speed transmission boxes (2-1). Each group of the variable speed transmission boxes (2-1) is internally provided with a walking guide rail (2-2) and a transmission belt assembly arranged on the inner side of the walking guide rail (2-2). A plurality of groups of the transmission shafts are located between the walking guide rail (2-2) and the transmission belt assembly, and the transmission shafts are rotationally connected with the walking guide rail (2-2) and the transmission belt assembly. Each group of the transmission shafts includes a sleeve (2-3) and a support shaft (2-4) arranged inside the sleeve (2-3). The sleeve (2-3) is rotationally connected with the walking guide rail (2-2) and the transmission belt assembly. The support shaft (2-4) is provided with a support ring (2-5) at an end away from the inner wall of the shell (1), and the support ring (2-5) is internally provided with a rotating ball. An end surface of the variable speed transmission box (2-1) away from the shell (1) is provided with a lower support guide rail (2-6) below the rotating ball. An end surface of the transmission belt assembly away from the shell (1) is provided with an upper support guide rail (2-7) above the rotating ball. The rotating ball is rotationally connected with the upper support guide rail (2-7) and the lower support guide rail (2-6). An end surface of each group of the support ring (2-5) away from the support shaft (2-4) is provided with a connecting rod, and a lower end of each group of the connecting rod is fixed with a clamping assembly. Each group of the transmission belt assembly includes two groups of mounting plates (2-8). The two groups of mounting plates (2-8) close to the inner wall of the variable speed transmission box (2-1) are fixed with the variable speed transmission box (2-1). Slow transmission belts (2-9) and fast transmission belts (2-10) are arranged between the two groups of the mounting plates (2-8). The slow transmission belts (2-9) are inverted concave structures. The fast transmission belts (2-10) are located on the concave side of the slow transmission belts (2-9). The sleeves (2-3) are rotationally connected with the slow transmission belts (2-9) and the fast transmission belts (2-10). The clamping assembly comprises a bearing plate (3-1) fixed to the connecting rod at the upper end, a plurality of groups of adsorption shafts (3-2) arranged on both sides of the bearing plate (3-1), wherein two groups of the adsorption shafts (3-2) are in sliding connection with the bearing plate (3-1), and a plurality of groups of the adsorption shafts (3-2) are in sliding connection, and a friction plate (3-3) is arranged at the lower end of the bearing plate (3-1) and the lower end of the plurality of groups of adsorption shafts (3-2).

2. A combined plastic film leak detector according to claim 1, wherein: The bearing plate (3-1) is internally provided with sliding grooves at both ends, each group of the adsorption shafts (3-2) is internally provided with a sliding groove away from the bearing plate (3-1), one end of each group of the sliding grooves is internally provided with a telescopic air bag (3-5) close to the center line of the bearing plate (3-1), each group of the adsorption shafts (3-2) is provided with a sliding plate (3-4) close to the bearing plate (3-1), each group of the sliding plates (3-4) is embedded in each group of the sliding grooves, and the sliding plate (3-4) is fixed to one end of the telescopic air bag (3-5).

3. A combined plastic film leak detector according to claim 2, wherein: The bearing plate (3-1) is internally provided with an adsorption pump and a telescopic pump, the telescopic pump is in pipeline connection with a plurality of groups of telescopic air bags (3-5), and each group of the friction plates (3-3) is internally provided with an adsorption disc (3-6), and each group of the adsorption discs (3-6) is in pipeline connection with the adsorption pump.

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