Film coating vacuum chuck and adsorption method thereof

Abstract

The vacuum sucker comprises a sucker seat, a flange extending downwards is integrally formed on the lower surface of the sucker seat, a vacuum cavity with a downward opening is jointly defined by the inner side face of the flange and the lower surface of the sucker seat, and a connecting pipe connected with an air inlet of a vacuum pump is fixedly arranged on the sucker seat. A connecting rod is fixedly arranged on the suction cup base, a protective net cover is slidably arranged on the connecting rod, an opening of the protective net cover faces downwards, the protective net cover is used for protecting the upper portion and the peripheral side of the suction cup base, a plastic film is arranged between the edge of the opening of the protective net cover and the suction cup base, and the inner side of the plastic film is connected with the upper surface of the suction cup base. The outer side of the plastic film is connected with the edge of the opening of the protective net cover, a pressure relief assembly is arranged on the suction cup base and used for conducting pressure relief on the interior of the vacuum cavity, a driving frame is slidably arranged on the connecting rod and used for controlling the state of the pressure relief assembly, and the problem that in the prior art, the suction effect of a vacuum suction cup is poor is solved.

Description

Technical Field

[0001] This invention belongs to the field of suction cup equipment technology, and particularly relates to a coated vacuum suction cup and its adsorption method. Background Technology

[0002] During the inspection or repair of underwater concrete slopes or cracks in channels or reservoirs, if anchor points are used to fix the equipment on the concrete slope, the fixed anchor points are not only inconvenient for movement but also damage the integrity of the concrete slope. In practice, suction cups are used to fix the equipment. However, due to honeycomb, holes, cracks, slope curvature, expansion joint protrusions, and panel distortion on the concrete surface, the existing suction cups cannot fit completely, resulting in poor vacuuming effect and the suction cups failing to achieve the expected adsorption force.

[0003] Therefore, the technology for vacuum suction cups needs further improvement. Summary of the Invention

[0004] The purpose of this invention is to solve the problem of poor adsorption effect of vacuum suction cups in the prior art, and to propose a coated vacuum suction cup and its adsorption method.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a coated vacuum suction cup, comprising a suction cup base, wherein a downwardly extending flange is integrally formed on the lower surface of the suction cup base, the inner side of the flange and the lower surface of the suction cup base together define a vacuum cavity with a downward opening, a connecting pipe communicating with the vacuum cavity is fixedly disposed on the suction cup base, the connecting pipe is connected to the air inlet of a vacuum pump, an elastomer layer is disposed on the lower surface of the flange, a P-type side bubble sealing strip is disposed on the lower surface of the elastomer layer, a connecting rod is fixedly disposed on the suction cup base, the connecting rod is perpendicular to the upper surface of the suction cup base, a connecting ring is disposed at the end of the connecting rod, a protective mesh cover is disposed above the suction cup base, the protective mesh cover is connected to the connecting rod, and the opening of the protective mesh cover faces downward. The protective mesh cover is used to protect the top and sides of the suction cup base. The plane of the open edge of the protective mesh cover is on the same plane as the lower surface of the P-type side bubble sealing strip after compression and deformation. A plastic film is placed between the open edge of the protective mesh cover and the suction cup base. The plastic film is arranged around the suction cup base. The inner side of the plastic film is connected to the upper surface of the suction cup base, and the outer side of the plastic film is connected to the open edge of the protective mesh cover. A pressure relief assembly is provided on the suction cup base to relieve pressure in the vacuum chamber. A drive frame is slidably mounted on the connecting rod, and an electric push rod is mounted on the connecting pipe. The electric push rod is used to drive the drive frame to slide up and down along the connecting rod, and the drive frame is used to control the state of the pressure relief assembly.

[0006] As a further description of the above technical solution: the elastomer layer is made of one or more rubbers selected from the following: natural rubber (NR), styrene-butadiene rubber (SBR), nitrile rubber (NBR), chloroprene rubber (CR), ethylene propylene diene monomer (EPDM), and silicone rubber (VMQ).

[0007] As a further description of the above technical solution: the material of the P-type side bubble sealing strip is polyethylene or ethylene propylene diene monomer (EPDM) rubber.

[0008] As a further description of the above technical solution: the pressure relief assembly includes a pressure relief pipe, which is connected to the vacuum chamber and parallel to the connecting rod. A flared end of the pressure relief pipe away from the suction cup seat is provided with a flared opening, and a rubber ball corresponding to the flared opening is provided on the drive frame.

[0009] As a further description of the above technical solution: multiple pressure relief pipes are provided, and the multiple pressure relief pipes are evenly arranged in an array on the suction cup seat. A hollow mesh cover is provided at the end of the horn mouth away from the pressure relief pipe, and the rubber ball is placed inside the hollow mesh cover.

[0010] As a further description of the above technical solution: an extrusion assembly is provided inside the protective net cover. The extrusion assembly includes an extrusion plate, which is located above the plastic film. Multiple extrusion plates are arranged around the periphery of the suction cup seat. A drive plate is provided between each extrusion plate and the drive frame. One end of the drive plate is connected to the drive frame, and the other end is connected to the extrusion plate. When the drive frame moves toward the suction cup seat, the extrusion plate moves downward until the lower surface of the extrusion plate coincides with the plane where the opening edge of the protective net cover is located.

[0011] As a further description of the above technical solution: the outer side of the extrusion plate is rotatably disposed on the open edge of the protective mesh cover, an adjustment plate is slidably disposed on the upper surface of the extrusion plate, the end of the drive plate away from the drive frame is rotatably disposed on the adjustment plate, the rotation axis of the drive plate is perpendicular to the sliding direction of the adjustment plate, and the rotation axis of the drive plate is parallel to the rotation axis of the extrusion plate.

[0012] As a further description of the above technical solution: multiple pressure sensors are provided in the vacuum chamber of the suction cup seat. The multiple pressure sensors are evenly distributed in an array. The pressure sensors are electrically connected to the controller, which is used to control the working status of the vacuum pump.

[0013] Furthermore, an adsorption method utilizing the aforementioned underwater membrane-coated vacuum suction cup is also provided.

[0014] S1: Place the coated vacuum suction cup at the adsorption position;

[0015] S2: The electric push rod starts, driving the extrusion plate to squeeze the medium under the plastic film, and the rubber ball seals the pressure relief pipe;

[0016] S3: Start the vacuum pump to evacuate the vacuum chamber, and adjust the working status of the vacuum pump in real time according to the pressure sensor status.

[0017] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0018] (1) Setting up a protective net can provide good protection for the suction cups set underwater, preventing underwater debris from directly hitting the suction cup base, thereby ensuring the stability of the suction cup base's adsorption.

[0019] (2) The plastic film set between the edge of the opening of the suction cup seat and the protective net cover can fill the gap between the P-type side bubble sealing strip and the concrete slope surface under the action of water pressure or atmospheric pressure when the suction cup is pre-adsorbed, so that the vacuum cavity can form an initial negative pressure, which can promote the further deformation of the elastomer layer and the P-type side bubble sealing strip, thereby gradually reducing the gap between the P-type side bubble sealing strip and the concrete slope, and gradually increasing the negative pressure in the vacuum cavity until the maximum negative pressure is reached, so that the suction cup seat can be stably adsorbed on the concrete surface.

[0020] (3) The inner and outer two-layer P-type side bubble sealing strips further ensure the sealing effect. The extrusion component can effectively and quickly remove a large amount of the medium between the plastic film and the concrete. The extrusion plate can protect the plastic film and ensure the sealing performance of the plastic film under atmospheric pressure, water pressure and negative pressure.

[0021] (4) The smooth arc structure of the upper surface edge of the suction cup seat can prevent the plastic film under pressure from being damaged when it comes into contact with the suction cup seat. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0023] Figure 2 This is a three-dimensional structural diagram of the present invention, in which a protective mesh cover is hidden;

[0024] Figure 3 This is a schematic diagram of the three-dimensional structure of the suction cup holder of the present invention;

[0025] Figure 4 This is a cross-sectional view of the suction cup holder of the present invention;

[0026] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0027] Figure 6 This is a schematic diagram of the working state of the present invention.

[0028] Legend: 1. Suction cup seat; 2. Flange; 3. Vacuum chamber; 4. Connecting pipe; 5. Elastomer layer; 6. P-type side bubble sealing strip; 7. Connecting rod; 8. Connecting ring; 9. Protective mesh cover; 10. Pressure relief pipe; 11. Trumpet mouth; 12. Rubber ball; 13. Hollow mesh cover; 14. Drive frame; 15. Connecting block; 16. Electric push rod; 17. Plastic film; 18. Extrusion plate; 19. Drive plate; 20. Adjusting plate. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Please see Figure 1-6 This invention provides a technical solution for an underwater film-coated vacuum suction cup and its adsorption method:

[0031] A coated vacuum suction cup includes a suction cup base 1, which is made of stainless steel. In this embodiment, the suction cup base 1 is a cuboid. In other embodiments, the suction cup base 1 can be a cylinder. The upper surface edge of the suction cup base 1 forms a smoothly transitioned arc structure. The lower surface of the suction cup base 1 is integrally formed with a downwardly extending flange 2. The inner side of the flange 2 and the lower surface of the suction cup base 1 together define a downward-opening vacuum cavity 3. A connecting pipe 4 communicating with the vacuum cavity 3 is provided at the center of the upper surface of the suction cup base 1. The connection position between the connecting pipe 4 and the suction cup base 1 is a stainless steel pipe segment. The stainless steel pipe segment is perpendicular to the upper surface of the suction cup base 1. The connecting pipe 4 is connected to the air inlet of a vacuum pump (not shown in the figure). The connecting pipe 4 is made of stainless steel and is welded and fixed to the suction cup base 1.

[0032] An elastomer layer 5 is provided on the lower surface of the flange 2. In this embodiment, the elastomer layer 5 is made of natural rubber and is connected to the flange 2 by bolts or glue. In this embodiment, the elastomer layer 5 is formed by four natural rubber strips connected end to end in sequence.

[0033] The lower surface of the natural rubber strip is bonded with a P-type side bubble sealing strip 6 by adhesive. The P-type side bubble sealing strip 6 forms a rectangular ring structure. There are two P-type side bubble sealing strips 6, which are arranged as inner and outer rings. The material of the P-type side bubble sealing strip 6 is polyethylene.

[0034] Stainless steel connecting rods 7 are welded and fixed to the upper surface of the suction cup base 1. The connecting rods 7 are perpendicular to the upper surface of the suction cup base 1, and there are four connecting rods 7 evenly distributed at the four corners of the suction cup base 1. The ends of the connecting rods 7 are provided with connecting rings 8. A protective net cover 9 is provided above the suction cup base 1. The protective net cover 9 is composed of wire mesh and a metal frame. The lower part of the protective net cover 9 is open. The protective net cover 9 as a whole forms a truncated pyramid protective area. The protective net cover 9 is used to protect the upper part and the periphery of the suction cup base 1. The plane of the open edge of the protective net cover 9 is on the same plane as the lower surface of the P-type side bubble sealing strip 6 after compression and deformation. The protective net cover 9 is fixedly connected to the four connecting rods 7. The suction cup base 1 is centrally located at the open part of the protective net cover 9. The four sides of the suction cup base 1 correspond one-to-one with the four sides of the open part of the protective net cover 9 and are parallel to each other.

[0035] A pressure relief assembly is provided on the suction cup base 1 to relieve pressure on the vacuum chamber 3, thereby facilitating the removal of the suction cup base 1 from the suction. The pressure relief assembly includes a pressure relief pipe 10, which is connected to the vacuum chamber 3 and is parallel to the connecting rod 7. In this embodiment, four pressure relief pipes 10 are provided, which are evenly arranged in an array on the suction cup base 1. The pressure relief pipes 10 are located next to the connecting rod 7. A drive frame 14 is slidably sleeved on the connecting rod 7. The drive frame 14 is slidably sleeved on the stainless steel pipe section of the connecting pipe 4. A flared mouth 11 is provided at the end of the pressure relief pipe 10 away from the suction cup base 1. A rubber ball 12 corresponding to the flared mouth 11 is provided on the drive frame 14. A hollow mesh cover 13 is provided at the end of the flared mouth 11 away from the pressure relief pipe 10. The hollow mesh cover 13 forms a cylindrical area. The rubber ball 12 is located in the cylindrical area. A connecting block 15 is provided on the drive frame 14 and is connected to the rubber ball 12.

[0036] An electric push rod 16 is installed on the connecting pipe 4. The electric push rod 16 is connected to the controller and the power supply. The output end of the electric push rod 16 is fixedly connected to the drive frame 14. By driving the electric push rod 16, the drive frame 14 is caused to slide up and down along the connecting rod 7. When the drive frame 14 moves toward the suction cup seat 1, the rubber ball 12 moves toward the horn mouth 11. When the drive frame 14 moves to the minimum distance with the suction cup seat 1, the rubber ball 12 moves to the state of blocking the pressure relief pipe 10.

[0037] A plastic film 17 is provided between the edge of the opening of the protective net cover 9 and the suction cup seat 1. The plastic film 17 is arranged around the suction cup seat 1. The inner side of the plastic film 17 is connected to the upper surface of the suction cup seat 1, and the outer side of the plastic film 17 is connected to the edge of the opening of the protective net cover 9. The plastic film 17 forms an annular plastic film 17 strip on the outside of the suction cup seat 1. The width of the plastic film 17 strip is greater than the distance between the edge of the opening of the protective net cover 9 and the suction cup seat 1.

[0038] An extrusion assembly is provided inside the protective net cover 9. The extrusion assembly includes an extrusion plate 18, which is located above the plastic film 17. Multiple extrusion plates 18 are arranged around the suction cup base 1. In this embodiment, four extrusion plates 18 are arranged around the suction cup base 1. A drive plate 19 is provided between each extrusion plate 18 and the drive frame 14. One end of the drive plate 19 is connected to the drive frame 14, and the other end is connected to the extrusion plate 18. In this embodiment, the outer side of the extrusion plate 18 is rotatably disposed at the open edge of the protective net cover 9. An adjustment plate 20 is slidably disposed on the upper surface of the extrusion plate 18. The end of the drive plate 19 away from the drive frame 14 is rotatably disposed on the adjustment plate 20. The rotation axis of the drive plate 19 is perpendicular to the sliding direction of the adjustment plate 20, and the rotation axis of the drive plate 19 is parallel to the rotation axis of the extrusion plate 18. When the drive frame 14 moves toward the suction cup base 1, the extrusion plate 18 moves downward until the lower surface of the extrusion plate 18 coincides with the plane where the open edge of the protective net cover 9 is located.

[0039] Multiple pressure sensors (not shown in the figure) are installed inside the vacuum chamber 3 of the suction cup holder 1. The multiple pressure sensors are evenly distributed in an array. The pressure sensors are electrically connected to the controller, which is used to control the working status of the vacuum pump.

[0040] The adsorption method and working principle of the above-mentioned coated vacuum chuck are as follows:

[0041] The following example illustrates the working principle of a membrane-coated vacuum suction cup used for underwater concrete slope inspection or crack repair in channels or reservoirs. By stably adsorbing the suction cup of this application onto the concrete slope, related equipment (such as underwater sonar, grouting pipe) is connected to the connecting rings 8 on one or more connecting rods 7 of the suction cup, thereby fixing the related equipment.

[0042] Step 1: Place the coated vacuum suction cup at the suction position. Method 1: Align the vacuum chamber 3 of the suction cup base 1 with the concrete slope, allowing the suction cup base 1 to move along the concrete slope to the desired suction position. Specifically, connect the suction cup base 1 to the connecting ring 8 using a steel wire rope, gradually releasing the rope. Under the weight of the coated vacuum suction cup, it moves to the designated position. During this movement, due to the buoyancy of the water, the friction between the P-type side bubble sealing strip 6 and the plastic film 17 and the concrete surface is negligible, thus preventing damage to the P-type side bubble sealing strip 6 and the plastic film 17. Method 2: Lower the coated vacuum suction cup to the designated position from a stationary ship on the water surface. The position of the coated vacuum suction cup is mainly adjusted by controlling the length of the released steel wire rope. After the coated vacuum suction cup is placed at the desired suction position, the space between the plastic film 17 and the concrete is filled with water, causing the plastic film 17 to float upwards. The vacuum chamber 3 is also filled with water.

[0043] Step 2: The electric push rod 16 is activated, driving the extrusion plate 18 to squeeze the water under the plastic film 17. The rubber ball 12 blocks the pressure relief pipe 10. The output end of the electric push rod 16 causes the drive frame 14 to move towards the suction cup seat 1, causing the drive plate 19 to move. The movement of the drive plate 19 causes the adjusting plate 20 to slide. At the same time, the adjusting plate 20 and the drive plate 19 rotate relative to each other, causing the extrusion plate 18 to continue rotating after contacting the plastic film 17, thus squeezing out the water between the plastic film 17 and the concrete slope. During this process, the water in the plastic film 17 enters the vacuum chamber 3 through the P-type side bubble sealing strip 6, and the water in the vacuum chamber 3 is discharged through the pressure relief pipe 10. When the lower surface of the extrusion plate 18 is completely parallel to the plane where the P-type side bubble sealing strip 6 is located, the lower surface of the extrusion plate 18 is in complete contact with the plastic film 17. A small amount of water remains at the connection between the plastic film 17 and the suction cup seat 1, and the plastic film 17 forms wrinkles at this point. At the same time, the rubber ball 12 blocks the pressure relief port. At this time, the vacuum chamber 3 is still full of water.

[0044] Step 3: Start the vacuum pump to pump water and create a vacuum in vacuum chamber 3, adjusting the pump's operation in real time based on the pressure sensor status. Under water pressure, the extrusion plate 18 and plastic film 17 contact the surface of the concrete slope. After starting the vacuum pump, it first draws out the water from vacuum chamber 3. During this process, water remaining in the folds of plastic film 17 enters vacuum chamber 3 through the P-type side bubble sealing strip 6. As the water in vacuum chamber 3 is gradually drawn away, negative pressure gradually forms inside. Initially, the plastic film 17 fills the P-type side bubble sealing strip 6 under the suction of negative pressure and water pressure. The gap between the bubble sealing strip 6 and the concrete slope is sealed. As the negative pressure inside the vacuum chamber 3 gradually increases, the P-shaped side bubble sealing strip 6 and the elastomer layer 5 deform, ensuring the sealing of the vacuum chamber 3. This allows the suction cup seat 1 to firmly adhere to the concrete slope, thus achieving stable fixation of the equipment. Simultaneously, the suction pressure of the suction cup seat 1 is monitored in real time by a pressure sensor, and the negative pressure output of the vacuum pump is automatically adjusted through the controller's feedback mechanism. This intelligent suction control not only ensures the stability and efficiency of the suction but also effectively avoids operational errors or equipment damage caused by excessive or insufficient suction force. It should be noted that the pressure sensor and controller are existing technologies.

[0045] After the inspection or construction is completed, by controlling the vacuum pump to stop outputting pressure and driving the electric push rod 16, the rubber ball 12 releases the blockage of the pressure relief pipe 10, allowing water to enter the vacuum chamber 3 and between the plastic film 17 and the concrete slope, thereby enabling the suction cup of this application to be successfully removed from the adsorption position.

[0046] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of the present invention within the scope of the technology disclosed in the present invention, and all such substitutions or changes should be covered within the scope of protection of the present invention.

Claims

1. A coated vacuum suction cup, characterized in that: The device includes a suction cup base (1), the lower surface of which is integrally formed with a downwardly extending flange (2). The inner side of the flange (2) and the lower surface of the suction cup base (1) together define a vacuum chamber (3) with the opening facing downwards. A connecting pipe (4) communicating with the vacuum chamber (3) is fixedly installed on the suction cup base (1). The connecting pipe (4) is connected to the air inlet of the vacuum pump. An elastomer layer (5) is provided on the lower surface of the flange (2). A P-type side bubble sealing strip (6) is provided on the lower surface of the elastomer layer (5). A connecting rod (7) is fixedly installed on the suction cup base (1). The connecting rod (7) is perpendicular to the upper surface of the suction cup base (1). A connecting ring (8) is provided at the end of the connecting rod (7). A protective mesh cover (9) is provided above the suction cup base (1). The protective mesh cover (9) is connected to the connecting rod (7). The opening of the protective mesh cover (9) faces downwards. The protective mesh cover (9) is used to protect the suction cup base (1). The upper and circumferential surfaces are protected. The plane where the open edge of the protective mesh cover (9) is located is on the same plane as the lower surface of the P-type side bubble sealing strip (6) after compression and deformation. A plastic film (17) is provided between the open edge of the protective mesh cover (9) and the suction cup seat (1). The plastic film (17) is arranged around the suction cup seat (1). The inner side of the plastic film (17) is connected to the upper surface of the suction cup seat (1), and the outer side of the plastic film (17) is connected to the open edge of the protective mesh cover (9). A pressure relief assembly is provided on the suction cup seat (1). The pressure relief assembly is used to relieve pressure in the vacuum chamber (3). A drive frame (14) is slidably provided on the connecting rod (7). An electric push rod (16) is provided on the connecting pipe (4). The electric push rod (16) is used to drive the drive frame (14) to slide up and down along the connecting rod (7). The drive frame (14) is used to control the state of the pressure relief assembly.

2. The coated vacuum suction cup according to claim 1, characterized in that: The elastomer layer (5) is made of one or more rubbers selected from the following: natural rubber (NR), styrene-butadiene rubber (SBR), nitrile rubber (NBR), chloroprene rubber (CR), silicone rubber (VMQ), and ethylene propylene diene monomer (EPDM).

3. The coated vacuum suction cup according to claim 1, characterized in that: The P-type side bubble sealing strip (6) is made of polyethylene or ethylene propylene diene monomer (EPDM) rubber.

4. The coated vacuum suction cup according to claim 1, characterized in that: The pressure relief assembly includes a pressure relief pipe (10), which is connected to the vacuum chamber (3). The pressure relief pipe (10) is parallel to the connecting rod (7). A horn (11) is provided at one end of the pressure relief pipe (10) away from the suction cup seat (1). A rubber ball (12) corresponding to the horn (11) is provided on the drive frame (14).

5. The coated vacuum chuck according to claim 4, characterized in that: Multiple pressure relief pipes (10) are provided, and multiple pressure relief pipes (10) are evenly arranged in an array on the suction cup seat (1). A hollow mesh cover (13) is provided at the end of the horn mouth (11) away from the pressure relief pipe (10), and the rubber ball (12) is placed inside the hollow mesh cover (13).

6. The coated vacuum chuck according to claim 1, characterized in that: The protective net cover (9) is provided with an extrusion assembly, which includes an extrusion plate (18). The extrusion plate (18) is located above the plastic film (17). Multiple extrusion plates (18) are arranged around the suction cup seat (1). Each extrusion plate (18) is connected to a drive plate (19) between it and the drive frame (14). One end of the drive plate (19) is connected to the drive frame (14), and the other end is connected to the extrusion plate (18). When the drive frame (14) moves toward the suction cup seat (1), the extrusion plate (18) moves downward until the lower surface of the extrusion plate (18) coincides with the plane where the opening edge of the protective net cover (9) is located.

7. The coated vacuum chuck according to claim 6, characterized in that: The outer side of the extrusion plate (18) is rotatably disposed on the open edge of the protective net cover (9). An adjustment plate (20) is slidably disposed on the upper surface of the extrusion plate (18). The end of the drive plate (19) away from the drive frame (14) is rotatably disposed on the adjustment plate (20). The rotation axis of the drive plate (19) is perpendicular to the sliding direction of the adjustment plate (20), and the rotation axis of the drive plate (19) is parallel to the rotation axis of the extrusion plate (18).

8. The coated vacuum chuck according to claim 1, characterized in that: Multiple pressure sensors are installed in the vacuum chamber (3) of the suction cup seat (1). The multiple pressure sensors are evenly distributed in an array. The pressure sensors are electrically connected to the controller, which is used to control the working state of the vacuum pump.

9. An adsorption method using the coated vacuum suction cup according to claims 1-8, characterized in that: S1: Place the coated vacuum suction cup at the adsorption position; S2: The electric push rod (16) is started, driving the extrusion plate (18) to extrude the medium under the plastic film (17), and the rubber ball (12) seals the pressure relief pipe (10). S3: Start the vacuum pump to evacuate the vacuum chamber (3) and adjust the working status of the vacuum pump in real time according to the pressure sensor status.

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