Squid body membrane removing device and method thereof

Abstract

The application relates to a squid body film removing device and a method thereof, the method comprising low-temperature softening, warm water relaxation, film removing, hydraulic stripping and liquid nitrogen rapid cooling; the device comprises a rotating connector connected with a rotating drum at the output end of a telescopic assembly, the inner cavity of the rotating drum is connected with the output end of the rotating connector, the gas input end of the rotating connector is connected with an external gas source, and the inner cavity of the rotating drum is provided with a first push rod extending to the outside; the spermary assembly comprises a fixed seat, a shaft sleeve rotatably connected with the fixed seat and an elastic sleeve with an open end connected with the shaft sleeve, the shaft sleeve is matched with the rotating drum, a spring is arranged in the elastic sleeve, and the outer diameter of the spring gradually decreases from the side wall of the shaft sleeve; the rotating assembly is used for driving the rotating drum to rotate; the elastic capsule assembly is driven by the telescopic assembly to be inserted into the squid body, then the elastic capsule assembly is inflated and expanded to be attached to the inner side wall of the squid body, and the film on the squid body is removed by rotating the inflated elastic capsule assembly driven by the rotating assembly.

Description

Technical Field

[0001] This invention relates to the field of aquatic product processing technology, specifically to a squid carcass demembranes device and method. Background Technology

[0002] In the squid production and processing process, the outer skin, subcutaneous membrane, and inner membrane of the squid need to be cut off to prevent the squid slices from curling and deforming during steaming or boiling.

[0003] The process of processing squid includes: skinning, which involves opening the squid from the tail or front end to remove the outer skin; and cleaning the internal organs, which involves separating the squid's head from its body and removing the internal organs. This method of processing squid requires gutting the squid from the tail or front, and then removing the membrane from the inside of the squid carcass, making it impossible to preserve the complete squid carcass. For example, in the patent publication number CN212414568U, "A squid membrane removal device" is disclosed, where squid on a conveyor belt pass between the pressure roller and the membrane removal roller; the waste roller is located below the membrane removal roller, and the waste roller contacts and carries out the squid membrane removed by the membrane removal roller.

[0004] Some processed squid products require intact, ungummed squid carcasses, and the inner membrane of the squid carcass needs to be removed. Traditional membrane removal methods are difficult to achieve without gutting the squid. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a squid carcass membrane removal device and method to solve the aforementioned problems.

[0006] This invention provides the following technical solution: A method for removing the membrane from a squid carcass includes the following steps: Low-temperature softening: The squid carcass with its internal organs removed is evenly passed through the softening tank (100) via a conveyor belt. The time spent in the softening tank (100) is controlled at 5 to 10 minutes, and the temperature of the softening tank (100) is controlled at 5℃ to 10℃, so that the connection between the squid's epidermis (membrane) and the carcass muscle is weakened. Warm water relaxation: The softened squid carcass is evenly fed into a warm water tank (200) via a conveyor belt, so that it is completely immersed in warm water at 35℃~45℃. The immersion time is 30~60 seconds. The temperature difference effect is used to further promote the contraction of the squid skin and its separation from the carcass. Step 3: Demembranes removal: The squid carcasses processed in Step 2 are transported to the squid carcass demembranes removal device (300). The inner surface of the squid carcasses is gently brushed by the demembranes removal device (300) for 20 to 40 seconds. Step 4: Hydraulic stripping: The demembrane-removed squid carcass is fed into the high-pressure water curtain chamber (400) via a conveyor belt. Through the fan-shaped nozzles set in the high-pressure water curtain chamber (400), clean water with a water pressure of 0.1 to 0.3 MPa and a temperature of 15°C to 25°C is used to sweep the inner and outer surfaces of the squid carcass with a fan-shaped water curtain for 10 to 20 seconds, and the residual membrane fragments are completely removed by using the shearing force of the water flow. Step 5: Rapid cooling with liquid nitrogen: The demembranous squid carcass is conveyed into a liquid nitrogen freezing tunnel (500) via a conveyor belt and passed through a liquid nitrogen low-temperature environment of -80℃ to -110℃ for 60 to 180 seconds. This causes the core temperature of the squid carcass to drop rapidly to below -18°C, and the surface and internal moisture freezes into fine ice crystals in a very short time, thus preserving the squid's tender texture and quality to the greatest extent.

[0007] A device for removing the membrane from a squid carcass, comprising: A telescopic assembly, wherein the output end of the telescopic assembly is connected to a rotating cylinder via a rotary connector, the inner cavity of the rotating cylinder is connected to the output end of the rotary connector, the air input end of the rotary connector is connected to an external air source, and the inner cavity of the rotating cylinder is provided with a first push rod extending to the outside; The elastic bladder assembly includes a fixed base, a bushing rotatably connected to the fixed base, and an elastic sleeve with an open end connected to the bushing. The bushing is adapted to a rotating cylinder, and the elastic sleeve contains a spring. The outer diameter of the spring gradually decreases from the side wall of the bushing. Rotating component, used to drive the drum to rotate.

[0008] Preferably, the conveyor belt has placement rails evenly arranged on its outer side wall along its conveying track, and the placement rails are provided with clamping components for clamping squid carcasses; The clamping assembly includes a support part with a V-shaped upper surface and a clamping member rotatably connected to the movable frame. The clamping member is divided into a long side end and a short side end at its rotation point. The long side end of the clamping member is located on the side close to the support part, and a counterweight is provided on the short side end of the clamping member.

[0009] Preferably, the movable frame slides linearly on the placement rail, moving closer to or away from the support.

[0010] Preferably, the bushing and the rotating cylinder are respectively provided with a first friction pattern and a second friction pattern on the side where they cooperate with each other.

[0011] Preferably, the outer surface of the elastic sleeve is provided with uniformly distributed protrusions.

[0012] Preferably, the elastic bladder assembly is provided with multiple sets of annular arrays on the turntable, and the axis of the turntable is connected to the transmission teeth through a one-way tooth. The transmission teeth mesh with the first rack, and the first rack is connected to the output end of the telescopic device.

[0013] Preferably, it also includes a water tank containing cleaning fluid.

[0014] Preferably, the first rack includes a toothed portion and a toothless portion.

[0015] Preferably, it further includes a second rack that meshes with the transmission gear, and a second push rod is provided at the lower end of the second rack. The movement of the second push rod is used to push the spring of one of the elastic bladder assemblies that is not engaged with the rotating cylinder to expand or contract.

[0016] Preferably, a third push rod is hinged to the end of the second push rod, the third push rod is provided with a movable part, and also includes a track, the movable part moves along the track trajectory; The track includes a straight section and an arc section. When the movable part moves within the arc section of the track, it satisfies the following condition: the third push rod always faces the corresponding elastic bladder assembly.

[0017] The present invention has the following beneficial technical effects: The present invention uses a telescopic component to drive the elastic capsule component to be inserted into the squid carcass. Then the elastic capsule component is inflated and expands to fit against the inner wall of the squid carcass. The inner membrane of the squid carcass is removed by rotating the inflated elastic capsule component.

[0018] This allows for the removal of the inner membrane of the squid's mantle without gutting it.

[0019] This solution enables automated and continuous removal of the inner membrane from squid carcasses without manual intervention, achieving automated production and improving efficiency. During the membrane removal process, liquid nitrogen is used for cryogenic preservation, ensuring maximum retention of the squid carcass's flavor and nutrients, achieving a freshness-locking effect. Simultaneously, a precise control system adjusts the intensity and speed of membrane removal in real time, ensuring the squid carcass remains undamaged during processing, maintaining its original integrity and texture. The entire production process operates continuously, eliminating frequent downtime and further enhancing production efficiency to meet the automation requirements of large-scale production. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the cooperative structure of the rotating component and the elastic bladder component of the present invention; Figure 3 This is a cross-sectional view of the elastic capsule assembly of the present invention; Figure 4 This is a schematic diagram of the cooperation structure between the telescopic component and the turntable of the present invention; Figure 5 This is a schematic diagram of the clamping component structure on the placement bar of the present invention; Figure 6This is a schematic diagram of the rotating elastic bladder assembly and the third push rod of the present invention being inserted together.

[0021] Figure 7 This is a flowchart of the method of the present invention.

[0022] The attached figures are labeled as follows: 1. Conveyor belt; 2. Placement rack; 3. Turntable; 4. Elastic bladder assembly; 5. Telescopic assembly; 6. Rotating assembly; 7. Water tank; 21. Support unit; 22. Movable frame; 23. Clamping component; 31. Transmission gears; 41. Fixed base; 42. Bushing; 43. Elastic sleeve; 44. Spring; 45. First friction groove; 46. Nozzle; 47. Delivery hose; 61. Slider and slide rail assembly; 62. Rotary motor; 63. Rotary connector; 64. Rotary drum; 65. Second friction groove; 66. First push rod; 81. First rack; 82. Second rack; 83. Second push rod; 84. Third push rod; 85. Moving part; 86. Track.

[0023] 100. Softening tank; 200. Warm water tank; 300. Squid carcass removal device; 400. High-pressure water curtain chamber; 500. Liquid nitrogen freezing tunnel. Detailed Implementation

[0024] 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.

[0025] Example 1: A method for removing the membrane from a squid carcass, such as Figure 7 As shown: A method for removing the membrane from a squid carcass includes the following steps: Low-temperature softening: The squid carcass with its internal organs removed is evenly passed through the softening tank 100 via a conveyor belt. The time spent in the softening tank 100 is controlled at 5 to 10 minutes, and the temperature of the softening tank 100 is controlled at 5℃ to 10℃, which weakens the connection between the squid's epidermal membrane and the carcass muscle. Warm water relaxation: The softened squid carcass is evenly fed into a warm water tank 200 via a conveyor belt, so that it is completely immersed in warm water at 35℃~45℃. The immersion time is 30~60 seconds. The temperature difference effect is used to further promote the contraction of the squid skin and its separation from the carcass. Step 3: Demembranes removal: The squid carcasses processed in Step 2 are transported to the squid carcass demembranes removal device 300. The inner surface of the squid carcasses is gently brushed by the demembranes removal device 300 for 20-40 seconds. Step 4: Hydraulic stripping: The demembrane-removed squid carcass is fed into the high-pressure water curtain chamber 400 via a conveyor belt. Through the fan-shaped nozzles installed in the high-pressure water curtain chamber 400, clean water with a water pressure of 0.1-0.3 MPa and a temperature of 15-25°C is used to sweep the inner and outer surfaces of the squid carcass with a fan-shaped water curtain for 10-20 seconds, using the shearing force of the water flow to thoroughly remove the residual membrane fragments. Step 5: The demembranous squid carcass is conveyed into the liquid nitrogen freezing tunnel 500 via a conveyor belt. It passes through the liquid nitrogen low-temperature environment of -80℃ to -110℃ for 60 to 180 seconds, which rapidly lowers the core temperature of the squid carcass to below -18°C. The surface and internal moisture freeze into fine ice crystals in a very short time, thus preserving the squid's tender texture and quality to the greatest extent.

[0026] A squid carcass membrane removal device, such as Figure 2-3 As shown: It includes an elastic bladder assembly 4, a telescopic assembly 5, and a rotating assembly 6.

[0027] The elastic bladder assembly 4 includes a fixed base 41, a bushing 42, an elastic sleeve 43, and a spring 44. The elastic sleeve 43 may be made of rubber. The fixed base 41 is fixedly installed relative to the fixed base 41. The bushing 42 is rotatably connected to the fixed base 41 and is airtightly fitted. The end of the spring 44 with a larger outer diameter is fixed to the side wall of the bushing 42, and the end of the spring 44 with a smaller outer diameter extends away from the bushing 42. The elastic sleeve 43 has elastic deformation capability and is fitted relative to the outside of the spring 44. The open end of the elastic sleeve 43 is fixed to the side wall of the bushing 42. The outer diameter of the end of the spring 44 with a larger outer diameter is also smaller than the inner diameter of the squid carcass.

[0028] The telescopic component 5 can be a structure that enables linear movement, such as a telescopic cylinder, an electric push rod, or a screw drive structure. The rotating assembly 6 includes a slider-rail assembly 61, a rotary motor 62, a rotary connector 63, a rotating cylinder 64, and a first push rod 66. The rotary motor 62 achieves linear movement through the slider-rail assembly 61, and its output end is connected to the rotating cylinder 64 to drive the rotating cylinder 64 to rotate. One end of the rotating cylinder 64 is coaxially fixedly connected to the output end of the rotary connector 63, and the other end of the rotating cylinder 64 is open. The rotary connector 63 is installed at the output end of the telescopic assembly 5, and its air input end is connected to an external air source. The rotation axes of the rotary connector 63, the rotating cylinder 64, and the bushing 42 are consistent with the telescopic direction of the telescopic assembly 5. The first push rod 66 extends from the inner wall of the rotating cylinder 64 along the telescopic direction of the telescopic assembly 5 to the outer side of the rotating cylinder 64.

[0029] Working principle: The free end with the smaller outer diameter of the elastic bladder assembly 4 (the end with the smaller outer diameter of the spring 44) is inserted into the squid body. The telescopic assembly 5 extends, causing the rotating cylinder 64 to approach and fit against the bushing 42. The sealing between the rotating cylinder 64 and the bushing 42 is improved by a sealing ring. During this process, the rotary motor 62 moves with the help of the slider and slide rail assembly 61. At the same time, the first push rod 66 is inserted into the elastic sleeve 43 and the spring 44. The first push rod 66 contacts the spring 44 and pushes the spring 44 to lengthen, so that the spring 44, which was originally shorter, is lengthened.

[0030] Then, the external air source is sequentially delivered to the inner cavity of the elastic sleeve 43 through the rotary connector 63, the inner cavity of the rotating drum 64, and the bushing 42. The inner cavity of the elastic sleeve 43 is inflated and expands, and the inflated elastic sleeve 43 is adapted to the inner cavity of the squid mantle. Then, the rotary motor 62 drives the rotating drum 64 to rotate. The rotation of the rotating drum 64, through the cooperation of the first friction groove 45 and the second friction groove 65, drives the bushing 42 to rotate as well. The rotation of the bushing 42 drives the inflated elastic sleeve 43 to rotate in the inner cavity of the squid mantle, thereby removing the inner membrane of the squid mantle.

[0031] To improve the effectiveness of the elastic sleeve 43 in removing the inner membrane of the squid's body after inflation, evenly distributed protrusions can be provided on the outer surface of the elastic sleeve 43.

[0032] Example 2 includes all the contents of Example 1, such as... Figure 1 As shown: It includes a horizontally arranged conveyor belt 1, with placement rails 2 evenly arranged along its track on the outer side of the conveyor belt 1. The structure of the placement rails 2 is as follows: Figure 5 As shown, a clamping assembly is installed on the placement bar 2. The clamping assembly includes a support 21, a movable frame 22, and a clamping member 23. The upper surface of the support 21 has a V-shaped structure and is fixed to the end of the placement bar 2 near the elastic capsule assembly 4. The movable frame 22 slides linearly along the length of the placement bar 2 relative to it. After adjusting the position of the movable frame 22, it is fixed by bolts. The clamping member 23 is rotatably connected to the movable frame 22. The clamping member 23 is divided into a long side end and a short side end based on its rotation point. The long side end of the clamping member 23 is located on the side near the support 21. The short side end of the clamping member 23 is provided with a counterweight, so that under normal conditions, the long side end of the clamping member 23 is tilted upward and the short side end is pressed down, which makes it convenient for the staff to place the squid carcass in the placement bar 2 and below the long side end of the clamping member 23. The head (open end) of the squid carcass is placed on the upper surface of the support 21, and the lower half of the head of the squid carcass is placed in the V-shaped structure of the support 21. The squid carcass is a soft tissue. Under normal circumstances, the opening end of the squid carcass is in a closed state. Under the action of the V-shaped support part 21, the opening end of the squid carcass can be opened to a certain extent.

[0033] Working principle: The conveyor belt 1 moves a placement rack 2 carrying squid carcasses forward to the position aligned with the elastic capsule assembly 4; During the process of the telescopic component 5 extending to push the first push rod 66 into the elastic sleeve 43, the first push rod 66 pushes the spring 44 to stretch. The end of the spring 44 with a smaller outer diameter is convenient to be inserted into the opening end of the squid carcass. During this process, the spring 44 applies a pushing force to the squid carcass, so that the head of the squid carcass is pushed away from the support part 21 and the tail of the squid carcass is pushed into the short side end of the clamping member 23. The tail of the squid carcass engages with the short end of the clamping member 23, causing the clamping member 23 to rotate and move at an angle that allows the long end of the clamping member 23 to rotate and press down on the squid carcass, thus fixing the squid carcass.

[0034] Only a small portion of the spring 44 is inserted into the squid's body, and the elastic sleeve 43 inflates to fill the squid's internal cavity.

[0035] After the elastic sleeve 43 is inflated and removes the inner membrane of the squid carcass, the external air source is disconnected, causing the elastic sleeve 43 to deflate and return to its original position. The telescopic component 5 shortens and resets, causing the first push rod 66 to be pulled out of the elastic sleeve 43, which in turn causes the spring 44 to return to its original position and shorten. The above settings achieve the separation of the elastic sleeve component 4 from the squid carcass without affecting the movement of the conveyor belt 1 / placement rack 2.

[0036] Example 3: Includes all the content of Example 2, such as... Figure 1 , 4 As shown: It also includes a turntable 3, and the elastic bladder assembly 4 has multiple sets of ring arrays distributed on the side wall of the turntable 3. The outer wall of the elastic sleeve 43 will have residual squid mantle membrane, which is prone to bacterial growth if not cleaned for a long time.

[0037] The center of rotation of turntable 3 is connected to a transmission gear 31 via a one-way wheel; It also includes a mounting frame (hidden in the attached figure), on which a first rack 81 that slides horizontally and a second rack 82 that slides vertically are slidably connected. One end of the first rack 81 is connected to the output end of the telescopic component 5, and a second push rod 83 is provided at the lower end of the second rack 82. The first rack 81 and the second rack 82 simultaneously mesh with the transmission gear 31.

[0038] like Figure 4 As shown, the first rack 81 includes a toothless portion on the left and a toothed portion on the right, and the toothed portion of the first rack 81 meshes with the transmission gear 31.

[0039] like Figure 6As shown, a track 86 is fixedly installed on the mounting frame, and a third push rod 84 is hinged to the lower end of the second push rod 83. A circular movable part 85 is provided in the middle of the third push rod 84. The movable part 85 moves within the track 86 along the trajectory of the track 86. The track 86 includes a straight segment and an arc segment. The length direction of the straight segment is consistent with the moving direction of the second rack 82.

[0040] It also includes a water tank 7, which contains cleaning fluid, which can be water; an ultrasonic generator is installed on the water tank 7 to drive the cleaning fluid to vibrate.

[0041] A torsion spring can be provided between the second push rod 83 and the third push rod 84, and the torsion spring controls the third push rod 84 to rotate to be parallel with the second push rod 83.

[0042] Working principle: When the telescopic component 5 extends and drives the elastic bladder component 4 to insert into the squid carcass, the turntable 3 remains relatively stationary during this process due to the action of the one-way wheel.

[0043] When the telescopic component 5 extends or retracts, the toothless part of the first rack 81 first engages with the transmission tooth 31, so that the turntable 3 remains stationary while the first push rod 66 is pulled out of the elastic sleeve 43; then the telescopic component 5 continues to retract the toothed part of the first rack 81, which engages with the transmission tooth 31 to drive the turntable 3 to rotate at a set angle, so that the adjacent two sets of elastic bladder components 4 alternate positions.

[0044] During the extension or retraction of the telescopic component 5, the first rack 81 and the transmission gear 31 sequentially drive the second rack 82 to descend vertically. When the movable part 85 moves to the junction of the straight segment and the arc segment, as shown in the image... Figure 6 As shown on the left, at this time, the lower end of the third push rod 84 is located near the opening of the bushing 42 of the elastic bladder assembly 4; then, the telescopic assembly 5 continues to extend or shorten, causing the turntable 3 to rotate, which in turn causes the elastic bladder assembly 4 to rotate. At this time, the movable part 85 moves to the arc section of the track 86. Under the guidance of the arc section, the lower end of the third push rod 84 rotates during its descent, always aligning with the opening of the bushing 42. The third push rod 84 is inserted into the elastic sleeve 43, pushing the spring 44 to stretch, causing the elastic sleeve 43 to deform and expand. At this time, as shown... Figure 6 As shown on the right, the elastic sleeve 43 expands and is immersed in the cleaning fluid in the water tank 7 to clean the outer surface. The water level of the cleaning fluid is lower than that of the bushing 42.

[0045] Example 4: Includes all the content of Example 3: like Figure 3 As shown, a nozzle 46 is provided on the outer wall of the elastic sleeve 43. One end of the delivery hose 47 is connected to the nozzle 46, and the other end passes through the inner cavity of the elastic sleeve 43 and is connected to an external positive pressure water source.

[0046] After the inflated elastic sleeve 43 rotates and removes the membrane from the squid's internal cavity, the elastic sleeve 43 first deflates and shrinks in size. Then, an external positive pressure water source sprays water through the delivery hose 47 from the nozzle 46, thereby achieving a preliminary cleaning of the inner surface of the squid's internal cavity after the membrane is removed. During this process, the elastic sleeve 43 continues to rotate relative to the inside.

[0047] The embodiments described above are merely illustrative of specific implementations of the present invention, and while the descriptions are detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A squid carcass membrane removal device (300), characterized in that, include: Telescopic assembly (5), the output end of the telescopic assembly (5) is connected to a rotating cylinder (64) via a rotary connector (63), the inner cavity of the rotating cylinder (64) is connected to the output end of the rotary connector (63), the air input end of the rotary connector (63) is connected to an external air source, and the inner cavity of the rotating cylinder (64) is provided with a first push rod (66) extending to the outside. The elastic bladder assembly (4) includes a fixed base (41), a bushing (42) rotatably connected to the fixed base (41), and an elastic sleeve (43) with its open end connected to the bushing (42). The bushing (42) is adapted to the rotating cylinder (64), and the elastic sleeve (43) contains a spring (44). The outer diameter of the spring (44) gradually decreases from the side wall of the bushing (42). Rotating component (6) for driving the rotating drum (64) to rotate; It also includes a conveyor belt (1), on the outer side wall of the conveyor belt (1) are evenly provided with placement rails (2) along its conveying track, and the placement rails (2) are provided with clamping components for clamping squid carcasses; The clamping assembly includes a support part (21) with a V-shaped upper surface and a clamping member (23) rotatably connected to the movable frame (22). The clamping member (23) is divided into a long side end and a short side end at its rotation point. The long side end of the clamping member (23) is located on the side close to the support part (21), and a counterweight is provided on the short side end of the clamping member (23).

2. The squid carcass demembranes removal device (300) according to claim 1, characterized in that, The movable frame (22) slides linearly on the placement bar (2) to move closer to or away from the support (21).

3. The squid carcass demembranes removal device (300) according to claim 1, characterized in that, The bushing (42) and the rotating cylinder (64) are respectively provided with a first friction texture (45) and a second friction texture (65) on the side where they cooperate with each other.

4. The squid carcass demembranes removal device (300) according to claim 1, characterized in that, The outer surface of the elastic sleeve (43) is provided with evenly distributed protrusions.

5. The squid carcass demembranes removal device (300) according to claim 1, characterized in that, The elastic bladder assembly (4) is provided with multiple sets of annular arrays on the turntable (3). The axis of the turntable (3) is connected to the transmission teeth (31) through a one-way tooth. The transmission teeth (31) mesh with the first rack (81). The first rack (81) is connected to the output end of the telescopic assembly (5).

6. The squid carcass demembranes removal device (300) according to claim 5, characterized in that, The first rack (81) includes a toothed portion and a toothless portion.

7. The squid carcass demembranes removal device (300) according to claim 5, characterized in that, It also includes a second rack (82) that meshes with the transmission gear (31), and a second push rod (83) is provided at the lower end of the second rack (82). The movement of the second push rod (83) is used to push the spring (44) of one of the elastic bladder assemblies (4) that is not engaged with the rotating cylinder (64) to unfold or shorten.

8. A squid carcass removal device (300) according to claim 7, characterized in that, The end of the second push rod (83) is hinged to a third push rod (84), the third push rod (84) is provided with a movable part (85), and also includes a track (86), the movable part (85) moves along the track (86) on the track (86); The track (86) includes a straight section and an arc section. When the movable part (85) moves within the arc section of the track (86), it satisfies the following: the third push rod (84) always faces the corresponding elastic bladder assembly (4).

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