A bellows door panel turning device with high sealing performance

Abstract

The present invention discloses a bellows door panel flipping device with high sealing performance, wherein the flipping plate is arranged on the side of the isolation plate located in the high pressure area, the edge of the connecting port is provided with a limiter, the limiter is used to limit the flipping plate in the high pressure area, the driving mechanism and the flipping connection mechanism are arranged on the other side of the isolation plate located in the low pressure area; the driving mechanism comprises a cylinder, a chain and a connecting block, the output shaft of the cylinder is connected to the chain through the connecting block; the flipping connection mechanism comprises a first rotating shaft and a flipping connection part, the chain is connected to the first rotating shaft by transmission, one end of the flipping connection part is fixedly connected to the first rotating shaft and rotates with the first rotating shaft, and the other end of the flipping connection part is fixedly connected to the side of the flipping plate located in the low pressure area. The bellows door panel flipping device with high sealing performance can make the flipping plate fit more closely on the isolation plate due to the pressure difference, thereby ensuring the sealing performance of the connecting port and improving the quality of the finished tempered glass.

Description

Technical Field

[0001] The invention relates to the technical field of glass tempering, in particular to a bellows door panel turning device with high sealing performance. Background Art

[0002] In the glass tempering process, the heated glass needs to be cooled quickly. Depending on the cooling wind pressure, the tempered glass formed after cooling will also be different, thus forming a variety of tempered glass.

[0003] The existing structure for adjusting wind pressure is to set an adjusting cover between the high-pressure area and the low-pressure area of ​​the wind collecting box. However, since the adjusting cover and the driving mechanism are arranged on the low-pressure side, when the cover is closed, the gas on the high-pressure side can easily push the cover open, resulting in poor sealing and air leakage. The sealing is poor, resulting in low quality of the finished tempered glass. Summary of the invention

[0004] In view of the above-mentioned defects, the purpose of the present invention is to propose a bellows door panel flipping device with high sealing performance, in which the flip plate is located in the high-pressure area, and the driving mechanism and the flip connecting mechanism are located in the low-pressure area. Due to the pressure difference, the flip plate will fit more closely to the isolation plate, thereby ensuring the sealing performance of the connecting port and improving the quality of the finished tempered glass.

[0005] To achieve this purpose, the present invention adopts the following technical solutions: a highly sealed bellows door panel flipping device, comprising a flip plate arranged between a high-pressure area and a low-pressure area of ​​a bellows collecting box body, a driving mechanism and a flip connection mechanism;

[0006] An isolation plate is provided between the high-pressure area and the low-pressure area of ​​the air collecting box body, the isolation plate is provided with a communication port, and the flip plate is used to open or close the communication port;

[0007] The flip plate is arranged on one side of the isolation plate located in the high pressure area, a limiter is arranged on the edge of the communication port, and the limiter is used to limit the flip plate in the high pressure area, and the driving mechanism and the flip connection mechanism are arranged on the other side of the isolation plate located in the low pressure area;

[0008] The driving mechanism comprises a cylinder, a chain and a connecting block, and the output shaft of the cylinder is connected to the chain through the connecting block;

[0009] The flip connection mechanism includes a first rotating shaft and a flip connection part, the chain is drivingly connected to the first rotating shaft, one end of the flip connection part is fixedly connected to the first rotating shaft and rotates with the first rotating shaft, and the other end of the flip connection part is fixedly connected to one side of the flip plate located in the low-pressure area;

[0010] The cylinder drives the flip connection part to swing, thereby driving the flip plate to perform flipping motion around the first rotating shaft.

[0011] For example, the driving mechanism also includes a chain tensioner, which includes a tensioning screw and a connecting head. Both ends of the tensioning screw are provided with threaded openings, and each end of the tensioning screw is connected to a connecting head. One end of the connecting head is threadedly connected to the tensioning screw through the corresponding threaded opening, and the other end of the connecting head is hinged to the chain.

[0012] It is worth noting that the driving mechanism further includes an adjusting part, which includes a nut, an adjusting rod and an adjusting plate, the adjusting plate is slidably arranged on the adjusting rod, and both ends of the adjusting rod are threadedly connected to the nut;

[0013] The adjusting rod is arranged at the end of the output shaft of the cylinder, and the adjusting plate is fixedly connected to the connecting block.

[0014] Optionally, the connecting block includes a first clamping portion and a second clamping portion that cooperate with each other, the first clamping portion and the second clamping portion are respectively arranged on both sides of the chain perpendicular to its own movement direction, and the first clamping portion and the second clamping portion are both fixedly connected to the chain.

[0015] Specifically, the flip connection mechanism further includes a second rotating shaft parallel to the first rotating shaft, the chain is arranged between the first rotating shaft and the second rotating shaft, and the chain is transmission-connected to the second rotating shaft.

[0016] Preferably, the first rotating shaft and the second rotating shaft are both arranged on the other side of the isolation plate located in the low-pressure area through seat bearings.

[0017] For example, the limiting member is arranged around the edge of the communicating port, and the limiting member is wrapped with a sealing strip.

[0018] It is worth noting that the flip connection mechanism includes a first limiting pad and a second limiting pad;

[0019] The first limiting pad is arranged on one side of the flip connection portion, and when the flip plate is completely closed, the first limiting pad abuts against the inner wall of the air collecting box body;

[0020] The second limiting pad is arranged on the other side of the flip connection portion, and when the flip plate is fully opened, the second limiting pad abuts against the isolation plate.

[0021] Optionally, the flip connection part includes a support plate and a plurality of U-shaped connecting rods, two adjacent U-shaped connecting rods are connected by the support plate, one end of the U-shaped connecting rod is fixedly connected to the first rotating shaft, and the other end of the U-shaped connecting rod is fixedly connected to a side of the flip plate away from the high-pressure zone, and the opening of the U-shaped connecting rod faces the isolation plate.

[0022] Specifically, the cylinder body of the cylinder is arranged on the outer wall of the air collecting box body, and the air collecting box body is provided with a mounting through hole for the output shaft of the cylinder to extend into, and the output shaft of the cylinder extends into the air collecting box body through the mounting through hole, and a sealing ring is provided between the mounting through hole and the output shaft of the cylinder

[0023] The beneficial effects of the present invention are as follows: the flip plate and the isolation plate of the bellows door panel flip device with high sealing performance are in a cross-matching form, the flip plate is located in the high-pressure area, and the rotation center of the flip plate, namely the driving mechanism and the flip connection mechanism, is located in the low-pressure area. When the flip plate is closed, high-pressure gas exists on the side of the flip plate that is not connected to the flip connection mechanism, and low-pressure gas exists on the other side of the flip plate that is connected to the flip connection mechanism. Due to the pressure difference, the flip plate will be more closely attached to the isolation plate, ensuring the sealing of the connecting port and improving the quality of the finished tempered glass. The driving mechanism is arranged in the low-pressure area, so that there will be no protruding structure in the high-pressure area, ensuring smooth gas flow in the high-pressure area. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a front view of a flip device in one embodiment of the present invention;

[0025] Figure 2 is a left side view of a turning device in one embodiment of the present invention;

[0026] Figure 3 is a schematic structural diagram of a driving mechanism and a flip connection mechanism in one embodiment of the present invention;

[0027] Figure 4 yes Figure 1 An enlarged schematic diagram of the structure of the portion circled by the dotted circle A in the illustrated embodiment;

[0028] Figure 5 yes Figure 2 An enlarged schematic diagram of the structure of the portion circled by the dotted circle B in the illustrated embodiment;

[0029] Figure 6 is a schematic structural diagram of a chain tensioner in one embodiment of the present invention;

[0030] Figure 7 is a schematic structural diagram of a turning device in one embodiment of the present invention;

[0031] Among them: 11 high pressure area; 12 low pressure area; 13 connecting port; 14 isolation plate; 15 sealing strip; 2 flip plate; 3 driving mechanism; 31 cylinder; 311 output shaft; 312 cylinder body; 32 connecting block; 321 first clamping part; 322 second clamping part; 33 adjusting part; 331 nut; 332 adjusting rod; 333 adjusting plate; 34 chain; 35 chain tensioner; 351 tensioning screw; 352 threaded opening; 353 connector; 4 flip connecting mechanism; 41 first rotating shaft; 42 second rotating shaft; 43 seat bearing; 44 flip connecting part; 441 support plate; 442 U-shaped connecting rod; 45 first limiting pad; 46 second limiting pad. DETAILED DESCRIPTION

[0032] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0033] In the description of the present invention, it is necessary to understand that the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" or "second" may explicitly or implicitly include one or more of the features, and are used to distinguish and describe features, without distinction of order or importance.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Combine the following Figures 1 to 7 , describes a high-sealing bellows door panel flipping device according to an embodiment of the present invention, comprising a flip plate 2 disposed between a high-pressure area 11 and a low-pressure area 12 of a bellows collecting box body, a driving mechanism 3 and a flip connection mechanism 4;

[0036] An isolation plate 14 is provided between the high pressure area 11 and the low pressure area 12 of the air collecting box body, and the isolation plate 14 is provided with a communication port 13, and the flip plate 2 is used to open or close the communication port 13;

[0037] The flip plate 2 is arranged on one side of the isolation plate 14 located in the high pressure area 11, and a limiter is arranged on the edge of the communication port 13, and the limiter is used to limit the flip plate 2 in the high pressure area 11, and the driving mechanism 3 and the flip connection mechanism 4 are arranged on the other side of the isolation plate 14 located in the low pressure area 12;

[0038] The driving mechanism 3 includes a cylinder 31, a chain 34 and a connecting block 32, and the output shaft 311 of the cylinder 31 is connected to the chain 34 through the connecting block 32;

[0039] The flip connection mechanism 4 includes a first rotating shaft 41 and a flip connection part 44, the chain 34 is transmission-connected to the first rotating shaft 41, one end of the flip connection part 44 is fixedly connected to the first rotating shaft 41 and rotates with the first rotating shaft 41, and the other end of the flip connection part 44 is fixedly connected to one side of the flip plate 2 located in the low-pressure area 12;

[0040] The cylinder 31 drives the flip connection portion 43 to swing, thereby driving the flip plate 2 to flip around the first rotating shaft 41 .

[0041] The flip plate 2 of the bellows door panel flip device with high sealing performance is cross-matched with the isolation plate 14. The flip plate 2 is located in the high-pressure area 11, and the rotation center of the flip plate 2, namely the drive mechanism 3 and the flip connection mechanism 4, is located in the low-pressure area 12. When the flip plate 2 is closed, there is high-pressure gas on the side of the flip plate 2 that is not connected to the flip connection mechanism 4, and there is low-pressure gas on the other side of the flip plate 2 that is connected to the flip connection mechanism 4. Due to the pressure difference, the flip plate 2 will fit more closely on the isolation plate 14, ensuring the sealing of the connecting port 13 and improving the quality of the finished tempered glass. The drive mechanism 3 is set in the low-pressure area 12, so that there will be no protruding structure in the high-pressure area 11, ensuring smooth gas flow in the high-pressure area 11.

[0042] like Figure 1 and 2As shown, when the air pressure needs to be adjusted, the output shaft 311 of the cylinder 31 pushes the connecting block 32 to move downward, the connecting block 32 drives the chain 34 to rotate, the chain 34 drives the first rotating shaft 41 to rotate, the first rotating shaft 41 drives the flip connection part 44 to rotate, the flip connection part 44 pushes the flip plate 2 to flip toward the high pressure area 11, the high pressure area 11 and the low pressure area 12 are connected through the connecting port 13, the high pressure wind in the high pressure area 11 will flow to the low pressure area 12, thereby changing the air pressure in the low pressure area 12, and achieving the effect of adjusting the wind pressure. By adjusting the flipping degree of the flip plate 2, the opening of the connecting port 13 can be adjusted, thereby adjusting the wind pressure in the low pressure area 12. When the wind pressure does not need to be adjusted, the output shaft 311 of the cylinder 31 moves upward, drives the flip plate 2 to flip toward the low pressure area 12, and finally covers the connecting port 13. In addition, when the flip plate 2 is closed, the cylinder 31 no longer needs to provide a force, and the flip plate 2 can cover the communication port 13 by using the air pressure difference, thereby reducing energy consumption.

[0043] like Figure 7 As shown, the cylinder 31 drives the flip connection part 43 to swing left and right, thereby driving the flip plate 2 to flip left and right around the first rotating shaft 41, thereby realizing the opening and closing of the communication port 13.

[0044] In some embodiments, Figure 3 and 6 As shown, the driving mechanism 3 also includes a chain tensioner 35, and the chain tensioner 35 includes a tensioning screw 351 and a connecting head 353. Both ends of the tensioning screw 351 are provided with threaded openings 352, and both ends of the tensioning screw 351 are connected to a connecting head 353. One end of the connecting head 353 is threadedly connected to the tensioning screw 351 through the corresponding threaded opening 352, and the other end of the connecting head 353 is hinged to the chain 34.

[0045] By rotating the connector 353, the connector 353 can be extended and retracted in the threaded opening 352 of the tensioning screw 351, so that the chain tensioner 35 can be extended or shortened. When installing the chain 34, the chain tensioner 35 is first extended to make it easier to install the chain 34 on the sprocket of the first rotating shaft 41, and then the chain tensioner 35 is shortened to shorten the chain 34, so that the chain 34 is fully in contact with the sprocket on the first rotating shaft 41, and the chain is not easily dropped during operation. The chain tensioner 35 facilitates the installation and maintenance of the chain 34 by the staff.

[0046] For example, Figure 4As shown, the driving mechanism 3 further includes an adjusting portion 33, the adjusting portion 33 includes a nut 331, an adjusting rod 332 and an adjusting plate 333, the adjusting plate 333 is slidably disposed on the adjusting rod 332, and both ends of the adjusting rod 332 are threadedly connected to the nut 331;

[0047] The adjusting rod 332 is disposed at the end of the output shaft 311 of the cylinder 31 , and the adjusting plate 333 is fixedly connected to the connecting block 32 .

[0048] The adjusting portion 33 has the function of adjusting the positional relationship between the output shaft 311 of the cylinder 31 and the chain 34. By loosening the nut 331, the adjusting plate 333 can slide freely on the adjusting rod 332. After adjusting the adjusting plate 333 so that the chain 34 and the output shaft 311 of the cylinder 31 are located at appropriate positions, the nut 331 is locked so that the chain 34 and the output shaft 311 of the cylinder 31 can be fixed to each other.

[0049] It is worth noting that if Figure 5 As shown, the connecting block 32 includes a first clamping portion 321 and a second clamping portion 322 that cooperate with each other. The first clamping portion 321 and the second clamping portion 322 are respectively arranged on both sides of the chain 34 that are perpendicular to its own movement direction, and the first clamping portion 321 and the second clamping portion 322 are both fixedly connected to the chain 34.

[0050] The above structure facilitates the staff to install the connecting block 32. During installation, the chain 34 only needs to be placed between the first clamping portion 321 and the second clamping portion 322, and then the first clamping portion 321 and the second clamping portion 322 are fixed to clamp the chain 34, so that the connecting block 32 can move synchronously with the chain 34.

[0051] Alternatively, if Figure 1 As shown, the flip connection mechanism 4 further includes a second rotating shaft 42 parallel to the first rotating shaft 41 , the chain 34 is disposed between the first rotating shaft 41 and the second rotating shaft 42 , and the chain 34 is drivingly connected to the second rotating shaft 42 .

[0052] The second rotating shaft 42 is provided with a sprocket, and the chain 34 is connected to the second rotating shaft 42 through the sprocket. The second rotating shaft 42 is used to support the chain 34 so that the chain 34 is in a taut state and will not fall off during operation.

[0053] Specifically, the first rotating shaft 41 and the second rotating shaft 42 are both disposed on the other side of the isolation plate 14 located in the low-pressure area 12 through a seat bearing 43 .

[0054] During operation, the first rotating shaft 41 and the second rotating shaft 42 rotate synchronously in the seat bearing 43. When the first rotating shaft 41 and the second rotating shaft 42 are both arranged on the other side of the isolation plate 14 located in the low-pressure area 12, the protruding structure of the high-pressure area 11 is further reduced, and the smoothness of gas flow in the high-pressure area 11 is improved.

[0055] Preferably, the limiting member is arranged around the edge of the communication port 13 , and the limiting member is wrapped with a sealing strip 15 .

[0056] The sealing strip 15 is preferably a bubble sealing strip 15. When the flip plate 2 is closed, the flip plate 2 and the sealing strip 15 fit tightly together to ensure a tight closure and prevent air leakage from the connecting opening 13.

[0057] In some embodiments, the flip connection mechanism 4 includes a first limiting pad 45 and a second limiting pad 46;

[0058] The first limiting pad 45 is disposed on one side of the flip connection portion 44, and when the flip plate 2 is completely closed, the first limiting pad 45 abuts against the inner wall of the air collecting box body;

[0059] The second limiting pad 46 is disposed at the other side of the flip connection portion 44 . When the flip plate 2 is fully opened, the second limiting pad 46 abuts against the isolation plate 14 .

[0060] When the flip plate 2 is closed, the second limiting pad 46 ensures that the flip plate 2 will not excessively squeeze the sealing strip 15, thereby extending the service life of the sealing strip 15; when the flip plate 2 is opened, the first limiting pad 45 ensures that the flip plate 2 will not hit the inner wall of the air collecting box body and cause deformation of the flip plate 2, thereby extending the service life of the flip plate 2 and ensuring the sealing.

[0061] For example, Figure 3 As shown, the flip connection part 44 includes a support plate 441 and a plurality of U-shaped connecting rods 442, and two adjacent U-shaped connecting rods 442 are connected by the support plate 441, one end of the U-shaped connecting rod 442 is fixedly connected to the first rotating shaft 41, and the other end of the U-shaped connecting rod 442 is fixedly connected to the side of the flip plate 2 away from the high-pressure area 11, and the opening of the U-shaped connecting rod 442 faces the isolation plate 14.

[0062] The structure of the U-shaped connecting rod 442 can connect the first rotating shaft 41 and the flip plate 2, and the U-shaped concave structure can avoid the edge of the isolation plate 14. When the U-shaped connecting rod 442 passes through the connecting port 13, it will not collide with the edge of the isolation plate 14, ensuring the smoothness of flipping. The structure in which multiple U-shaped connecting rods 442 are connected through the support plate 441 ensures that the first rotating shaft 41 and the flip plate 2 can be firmly connected, avoiding the breakage of the flip connection part 44 during flipping.

[0063] It is worth mentioning that the cylinder body 312 of the cylinder 31 is arranged on the outer wall of the air collecting box body, and the air collecting box body is provided with a mounting hole for the output shaft of the cylinder 31 to extend into, and the output shaft of the cylinder 31 extends into the air collecting box body through the mounting hole, and a sealing ring is provided between the mounting hole and the output shaft of the cylinder 31.

[0064] The above structure places the cylinder body 312 of the cylinder 31 outside the blowing workspace, which is convenient for the staff to maintain the cylinder body 312 of the cylinder 31, and is also convenient for the installation and connection of the air pipe of the cylinder 31. The sealing ring arranged between the installation through hole and the output shaft of the cylinder 31 can prevent the air collecting box from leaking and prevent the wind pressure from decreasing.

[0065] Other structures and operations of a bellows door panel flipping device with high sealing performance according to an embodiment of the present invention are well known to ordinary technicians in the field and will not be described in detail here.

[0066] In the description of this specification, the description with reference to the terms "embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0067] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A bellows door panel turning device with high sealing performance, characterized in that: It includes a flip plate, a driving mechanism and a flip connection mechanism arranged between the high-pressure area and the low-pressure area of ​​the air collecting box body; An isolation plate is provided between the high-pressure area and the low-pressure area of ​​the air collecting box body, the isolation plate is provided with a communication port, and the flip plate is used to open or close the communication port; The flip plate is arranged on one side of the isolation plate located in the high pressure area, a limiter is arranged on the edge of the communication port, and the limiter is used to limit the flip plate in the high pressure area, and the driving mechanism and the flip connection mechanism are arranged on the other side of the isolation plate located in the low pressure area; The driving mechanism comprises a cylinder, a chain and a connecting block, and the output shaft of the cylinder is connected to the chain through the connecting block; The flip connection mechanism includes a first rotating shaft and a flip connection part, the chain is drivingly connected to the first rotating shaft, one end of the flip connection part is fixedly connected to the first rotating shaft and rotates with the first rotating shaft, and the other end of the flip connection part is fixedly connected to one side of the flip plate located in the low-pressure area; The cylinder drives the flip connection part to swing, thereby driving the flip plate to flip around the first rotating shaft; The connecting block comprises a first clamping portion and a second clamping portion that cooperate with each other, the first clamping portion and the second clamping portion are respectively arranged on two sides of the chain that are perpendicular to the direction of movement of the chain, and the first clamping portion and the second clamping portion are both fixedly connected to the chain; The flip connection mechanism further includes a second rotating shaft parallel to the first rotating shaft, the chain is arranged between the first rotating shaft and the second rotating shaft, and the chain is drivingly connected to the second rotating shaft; The first rotating shaft and the second rotating shaft are both arranged on the other side of the isolation plate located in the low-pressure area through seat bearings.

2. The bellows door panel turning device with high sealing performance according to claim 1, characterized in that: The driving mechanism also includes a chain tensioner, which includes a tensioning screw and a connecting head. Both ends of the tensioning screw are provided with threaded openings, and each end of the tensioning screw is connected to a connecting head. One end of the connecting head is threadedly connected to the tensioning screw through the corresponding threaded opening, and the other end of the connecting head is hinged to the chain.

3. The bellows door panel turning device with high sealing performance according to claim 2, characterized in that: The driving mechanism further comprises an adjusting part, which comprises a nut, an adjusting rod and an adjusting plate, wherein the adjusting plate is slidably arranged on the adjusting rod, and both ends of the adjusting rod are threadedly connected to the nut; The adjusting rod is arranged at the end of the output shaft of the cylinder, and the adjusting plate is fixedly connected to the connecting block; The flip connection mechanism includes a first limiting pad and a second limiting pad; The first limiting pad is arranged on one side of the flip connection portion, and when the flip plate is completely closed, the first limiting pad abuts against the inner wall of the air collecting box body; The second limiting pad is arranged on the other side of the flip connection portion, and when the flip plate is fully opened, the second limiting pad abuts against the isolation plate.

4. The bellows door panel turning device with high sealing performance according to claim 1, characterized in that: The limiting member is arranged around the edge of the communicating port, and the limiting member is wrapped with a sealing strip.

5. The bellows door panel turning device with high sealing performance according to claim 3, characterized in that: The flip connection part includes a support plate and a plurality of U-shaped connecting rods, and two adjacent U-shaped connecting rods are connected by the support plate. One end of the U-shaped connecting rod is fixedly connected to the first rotating shaft, and the other end of the U-shaped connecting rod is fixedly connected to a side of the flip plate away from the high-pressure area, and the opening of the U-shaped connecting rod faces the isolation plate.

6. A bellows door panel turning device with high sealing performance according to claim 5, characterized in that: The cylinder body of the cylinder is arranged on the outer wall of the air collecting box body, and the air collecting box body is provided with a mounting hole for the output shaft of the cylinder to extend into. The output shaft of the cylinder extends into the air collecting box body through the mounting hole, and a sealing ring is provided between the mounting hole and the output shaft of the cylinder.

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