Die casting cleaning device with self-cleaning function

Abstract

The invention discloses a die casting cleaning device with a self-cleaning function, and relates to the technical field of casting, the die casting cleaning device comprises a processing body, the processing body is composed of two cylindrical cavities, the bottom of each cylindrical cavity is provided with a slide way, a clamping assembly is arranged between the two cylindrical cavities, and a cleaning assembly is arranged in each cylindrical cavity; the die casting is placed in the clamping assembly, then the clamping assembly drives the die casting to move towards the side close to the cylindrical cavities, when the axis of the clamping assembly and the axis of the cylindrical cavities are in a coincident state, the axis of the die casting is also coincident with the axis of the cylindrical cavities at the moment, and then the two cylindrical cavities move towards the side close to the die casting; and finally, the controller controls the cleaning assembly to be started, the cleaning assembly cleans the surface of the die casting immediately, burrs on the surface of the die casting are cleaned up, the surface of the die casting is smooth, and then the cleanliness of the surface of the die casting is improved.

Description

Technical Field

[0001] The invention relates to the technical field of casting, in particular to a die casting cleaning device with a self-cleaning function. Background Art

[0002] Die casting is a kind of pressure casting part. It uses a pressure casting mechanical die casting machine with a casting mold installed. The heated liquid copper, zinc, aluminum or aluminum alloy metal is poured into the feed port of the die casting machine. The die casting machine is die-cast to cast copper, zinc, aluminum or aluminum alloy parts of the shape and size limited by the mold. Such parts are usually called die castings. In the stamping process, there is a gap between the punch on the die and the lower die, or there is a gap between the cutters at the cut, and burrs are easily generated due to mold wear. The shape of the stamping burr varies according to the material of the plate, the thickness of the plate, the gap between the upper and lower dies, the shape of the stamping parts, etc., and the burrs of die castings are usually difficult to avoid, so die castings need to be deburred;

[0003] The cleaning of die casting blanks is still done manually using files, which makes cleaning difficult, labor-intensive, and low in production efficiency. In addition, manual cleaning can easily damage the surface of the blank and affect the appearance quality. Summary of the invention

[0004] The object of the present invention is to provide a die casting cleaning device with a self-cleaning function to solve the problems raised in the prior art.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A die casting cleaning device with a self-cleaning function, comprising: a processing body, the processing body is composed of two cylindrical cavities, an input port is arranged on the opposite side of the two cylindrical cavities, a slideway is arranged at the bottom of the cylindrical cavity, the cylindrical cavity slides on the slideway, a clamping component is arranged between the two cylindrical cavities, and a cleaning component is arranged in the cylindrical cavity;

[0007] The die-casting is placed in the clamping assembly, and then the clamping assembly drives the die-casting to move, and the clamping assembly moves to the side close to the cylindrical cavity. When the axis of the clamping assembly coincides with the axis of the cylindrical cavity, the axis of the die-casting also coincides with the axis of the cylindrical cavity. Then the two cylindrical cavities move to the side close to the die-casting, so that the die-casting is surrounded by the two cylindrical cavities and the clamping assembly. Finally, the controller controls the cleaning assembly to start, and the cleaning assembly immediately cleans the surface of the die-casting, cleans the burrs on the surface of the die-casting, makes the surface of the die-casting smooth, and thereby improves the cleanliness of the surface of the die-casting.

[0008] Preferably, the clamping assembly consists of a fixed body and a rotating body, the fixed body is rotatably connected to the rotating body, the fixed body is arranged on one side of the slideway, a rotating motor is arranged in the fixed body, and a driving shaft of the rotating motor is connected to the rotating body.

[0009] Preferably, a clamping ring is provided on the side of the rotating body away from the fixed body, a plurality of auxiliary plates are provided inside the clamping ring, a push cylinder is provided in the inner wall of the clamping ring, a push rod of the push cylinder is connected to the auxiliary plate, and the auxiliary plate is arc-shaped.

[0010] Preferably, a rotating groove is provided at the center of the auxiliary plate, a plurality of conveying wheels are rotatably connected in the rotating groove, the conveying wheels are rotatably connected to the rotating groove, a No. 1 motor is provided in the rotating groove, and a driving shaft of the No. 1 motor is connected to the conveying wheels.

[0011] Before the die casting is clamped, the clamping ring is separated from the two cylindrical cavities; then, after the staff puts the die casting into the clamping ring, the controller controls the push cylinder to start, and the push rod of the push cylinder then drives the auxiliary plate to move, and several auxiliary plates move to the side close to the die casting. During the movement of the auxiliary plate, the auxiliary plate drives the conveying wheel to move, so that the conveying wheel contacts the surface of the die casting during the movement, thereby clamping the surface of the die casting;

[0012] Then the controller controls the driving of the rotating motor in the fixed body, and the driving shaft in the rotating motor drives the rotating body to rotate, and the rotating body rotates toward the processing body, and the clamping ring then drives the die-casting to rotate toward the cylindrical cavity, so that the die-casting rotates between the two cylindrical cavities. When the axis of the clamping assembly is in a coincidence state with the axis of the cylindrical cavity, the axis of the die-casting also coincides with the axis of the cylindrical cavity. Then the controller controls the cylindrical cavity to move along the slide, and the two cylindrical cavities then move toward each other. Finally, the two cylindrical cavities are respectively in contact with the surfaces of the two air supply rings, and then the two cylindrical cavities and the clamping ring cooperate with each other to surround the die-casting, thereby preventing debris from overflowing during the surface cleaning of the die-casting, thereby affecting the environment during the cleaning of the die-casting, causing physical and mental damage to the staff.

[0013] Preferably, the cleaning assembly comprises: a cleaning hole, the number of the cleaning holes is several, the several cleaning holes are arranged around the axis of the cylindrical cavity, an air suction pipe is arranged in the cleaning hole, a storage box is arranged outside the circular cavity, the air suction pipe is connected to the storage box through a pipeline, the storage box is provided with filter holes, a sliding ring is also arranged in the cleaning hole, a rotating block is arranged on the side of the sliding ring close to the cleaning hole, a plurality of springs are arranged between the sliding ring and the rotating block, one side of the spring is connected to the sliding ring, and the other side of the spring is connected to the rotating block, the sliding ring is a magnetic conductor, an electromagnet is arranged on the side of the cleaning hole away from the spring, and an electromagnetic coil is arranged in the inner wall of the cleaning hole.

[0014] Preferably, the sliding ring is slidably connected to the cleaning hole, and a plurality of cleaning brushes are provided on a side of the sliding ring away from the cleaning hole, and the plurality of cleaning brushes are arranged around the axis of the sliding ring.

[0015] Preferably, a plurality of extension strips are provided on a side of the suction pipe close to the cleaning brush, and a diameter of the extension strips is larger than a diameter of the suction pipe.

[0016] Preferably, an air supply ring is provided on one side of the clamping ring close to the cylindrical cavity, an air supply port is provided on the air supply ring, and the air supply port is connected to an air pump through a pipeline.

[0017] When the die casting is surrounded by the cylindrical cavity and the clamping ring, the controller controls the electromagnet in the cleaning hole to be powered off, and then the electromagnet loses its magnetic force after being powered off, and the sliding ring immediately loses its magnetic attraction, and then the sliding ring moves under the action of the spring elastic force, and the sliding ring moves to the side away from the cleaning hole. When the sliding ring moves, it drives the cleaning brush to move, and the cleaning brush extends from the cleaning hole to the inside of the cylindrical cavity, and the extended cleaning brush contacts the surface of the die casting;

[0018] Then the controller controls the electromagnetic coil in the inner wall of the cleaning hole to be energized. Since the sliding ring is a magnetic conductor, the sliding ring generates a rotational force under the influence of the magnetic force of the electromagnetic coil. The sliding ring then rotates around the axis of the cleaning hole. When the sliding ring rotates, it drives the cleaning brush to rotate. When the cleaning brush rotates, the burrs on the surface of the die casting are polished and cleaned.

[0019] During the grinding process of the die casting, the controller controls the No. 1 motor to start, and the driving shaft of the No. 1 motor drives the conveying wheel to rotate. When the conveying wheel rotates, it contacts the surface of the die casting with friction, and then the die casting moves along the axis of the cylindrical cavity under the action of friction. During this process, the controller controls the No. 1 motor to move back and forth, so that the die casting moves back and forth in the two cylindrical cavities along the axis of the cylindrical cavity. During the movement of the die casting, the area clamped by the auxiliary plate will also enter the cylindrical cavity for cleaning, so that the die casting can be cleaned without dead angles, thereby improving the cleaning effect of the die casting;

[0020] During the cleaning process of the die casting, the controller controls the air pump to start the cabinet, the air pump extracts the outside air, and transmits it to the air supply ring through the pipeline, and finally transmits it to the input port through the air supply port. The air is transmitted to the cylindrical cavity through the input port, and the air flows in the gap between the cylindrical cavity and the die casting. Since the rotation of the electromagnetic coil and the cleaning of the cleaning brush will generate a lot of heat, the heat is output after the gas is input, so as to realize the cooling treatment of the die casting and the cylindrical cavity, and the output air carries the heat and the debris generated by the cleaning to the suction pipe, and is transported to the storage box through the suction pipe, and the debris is filtered by the filter, and the debris is stored in the storage box;

[0021] When the cleaning is completed, the controller controls the electromagnet in the cleaning hole to be energized, and then the electromagnet attracts the sliding ring, and the sliding ring moves to the side close to the cleaning hole. When the sliding ring moves, it drives the cleaning brush to move. In the process of the cleaning brush shrinking toward the cleaning hole, the cleaning brush encounters the expansion bar, so that the cleaning brush is separated under the action of the expansion bar, and then the debris remaining between the cleaning brushes falls, thereby achieving the self-cleaning effect of the cleaning brush, avoiding the accumulation of debris in the cylindrical cavity or the cleaning hole, and then affecting the normal operation of the equipment, thereby improving the cleanliness inside the cylindrical cavity and improving the stability of the equipment operation;

[0022] After self-cleaning, the cylindrical cavity moves to the opposite side, thereby causing the die-casting to separate from the two cylindrical cavities, and finally the rotating body drives the die-casting to separate from between the two cylindrical cavities.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The two cylindrical cavities then move toward each other, and finally the two cylindrical cavities contact the surfaces of the two air supply rings respectively, and then the two cylindrical cavities and the clamping ring cooperate with each other to surround the die-casting, thereby preventing debris from overflowing during the surface cleaning of the die-casting, thereby affecting the environment during the cleaning of the die-casting and causing physical and mental damage to the staff.

[0025] 2. When the cleaning is completed, the controller controls the electromagnet in the cleaning hole to be energized, and then the electromagnet attracts the sliding ring, and the sliding ring moves to the side close to the cleaning hole. When the sliding ring moves, it drives the cleaning brush to move. In the process of the cleaning brush shrinking toward the cleaning hole, the cleaning brush encounters the extension bar, so that the cleaning brush separates under the action of the extension bar, and then the debris remaining between the cleaning brushes falls, thereby achieving the self-cleaning effect of the cleaning brush, avoiding the accumulation of debris in the cylindrical cavity or the cleaning hole, and then affecting the normal operation of the equipment, thereby improving the cleanliness inside the cylindrical cavity and improving the stability of the equipment operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A perspective view of the present invention;

[0027] Figure 2 is a schematic diagram of the structure of the clamping assembly;

[0028] Figure 3 is a front view of the clamping assembly;

[0029] Figure 4 It is a structural schematic diagram of a cylindrical cavity;

[0030] Figure 5 It is a cross-sectional structural schematic diagram of the present invention;

[0031] Figure 6 It is an internal front view of the present invention;

[0032] Figure 7 It is a schematic diagram of the structure of the cleaning hole, the air suction pipe and the sliding ring of the present invention;

[0033] Figure 8 Schematic diagram of the structure of the sliding ring and the cleaning brush.

[0034] In the figure: 1, processing body; 11, cylindrical cavity; 12, input port; 13, slideway;

[0035] 2. Clamping assembly; 21. Fixed body; 22. Rotating body; 23. Clamping ring; 24. Auxiliary plate; 25. Rotating groove; 26. Conveying wheel; 27. Air conveying ring;

[0036] 3. Cleaning assembly; 31. Cleaning hole; 32. Air suction pipe; 321. Extension strip; 33. Sliding ring; 331. Rotating block. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] Example: Figure 1-Figure 8 As shown, the present invention provides a technical solution for a die-casting cleaning device with a self-cleaning function, comprising: a processing body 1, the processing body 1 is composed of two cylindrical cavities 11, an input port 12 is arranged on the opposite side of the two cylindrical cavities 11, a slideway 13 is arranged at the bottom of the cylindrical cavity 11, the cylindrical cavity 11 slides on the slideway 13, a clamping component 2 is arranged between the two cylindrical cavities 11, and a cleaning component 3 is arranged in the cylindrical cavity 11.

[0039] As a specific embodiment of the present invention, the clamping assembly 2 is composed of a fixed body 21 and a rotating body 22, the fixed body 21 is rotatably connected to the rotating body 22, the fixed body 21 is arranged on one side of the slide 13, a rotating motor is arranged in the fixed body 21, and the driving shaft of the rotating motor is connected to the rotating body 22.

[0040] As a specific embodiment of the present invention, a clamping ring 23 is provided on the side of the rotating body 22 away from the fixed body 21, and a plurality of auxiliary plates 24 are provided inside the clamping ring 23. A push cylinder is provided in the inner wall of the clamping ring 23, and the push rod of the push cylinder is connected to the auxiliary plate 24, and the auxiliary plate 24 is arc-shaped.

[0041] As a specific embodiment of the present invention, a rotating groove 25 is provided at the center of the auxiliary plate 24, and a plurality of conveying wheels 26 are rotatably connected in the rotating groove 25. The conveying wheels 26 are rotatably connected to the rotating groove 25. A No. 1 motor is provided in the rotating groove 25, and the driving shaft of the No. 1 motor is connected to the conveying wheels 26.

[0042] As a specific embodiment of the present invention, the cleaning component 3 includes: a cleaning hole 31, the number of the cleaning holes 31 is several, and the several cleaning holes 31 are arranged around the axis of the cylindrical cavity 11, a suction pipe 32 is arranged in the cleaning hole 31, a storage box is arranged outside the circular cavity 11, the suction pipe 32 is connected to the storage box through a pipeline, and the storage box is provided with filter holes, and a sliding ring 33 is also arranged in the cleaning hole 31, and a rotating block 331 is arranged on the side of the sliding ring 33 close to the cleaning hole 31, and several springs are arranged between the sliding ring 33 and the rotating block 331, one side of the spring is connected to the sliding ring 33, and the other side of the spring is connected to the rotating block 331, the sliding ring 33 is a magnetic conductor, an electromagnet is arranged on the side of the cleaning hole 31 away from the spring, and an electromagnetic coil is arranged on the inner wall of the cleaning hole 31.

[0043] As a specific embodiment of the present invention, the sliding ring 33 is slidably connected to the cleaning hole 31 , and a plurality of cleaning brushes are arranged on a side of the sliding ring 33 away from the cleaning hole 31 , and the plurality of cleaning brushes are arranged around the axis of the sliding ring 33 .

[0044] As a specific implementation of the present invention, a plurality of extension strips 321 are provided on a side of the suction pipe 32 close to the cleaning brush, and a diameter of the extension strips 321 is greater than a diameter of the suction pipe 32 .

[0045] As a specific embodiment of the present invention, an air supply ring 27 is provided on one side of the clamping ring 23 close to the cylindrical cavity 11 , and an air supply port is provided on the air supply ring 27 , and the air supply port is connected to an air pump through a pipeline.

[0046] Working principle of the present invention:

[0047] Before the die casting is clamped, the clamping ring 23 is separated from the two cylindrical cavities 11; then, after the staff puts the die casting into the clamping ring 23, the controller controls the push cylinder to start, and the push rod of the push cylinder immediately drives the auxiliary plate 24 to move, and several auxiliary plates 24 move to the side close to the die casting. During the movement of the auxiliary plate 24, the auxiliary plate 24 drives the conveying wheel 26 to move, so that the conveying wheel 26 contacts the surface of the die casting during the movement, thereby clamping the surface of the die casting;

[0048] Then the controller controls the driving of the rotating motor in the fixed body 21, and the driving shaft in the rotating motor drives the rotating body 22 to rotate, and the rotating body 22 rotates toward the processing body 1, and the clamping ring 23 then drives the die casting to rotate toward the cylindrical cavity 11, so that the die casting rotates to between the two cylindrical cavities 11. When the axis of the clamping assembly 2 and the axis of the cylindrical cavity 11 are in a coincident state, the axis of the die casting also coincides with the axis of the cylindrical cavity 11 at this time, and then the controller controls the cylindrical cavity 11 to move along the slide 13, and the two cylindrical cavities 11 then move toward each other, and finally the two cylindrical cavities 11 are respectively in contact with the surfaces of the two air supply rings 27, and then the two cylindrical cavities 11 and the clamping ring 23 cooperate with each other to surround the die casting, thereby preventing debris from overflowing during the surface cleaning of the die casting, thereby affecting the environment during the cleaning of the die casting, causing physical and mental damage to the staff;

[0049] When the die casting is surrounded by the cylindrical cavity 11 and the clamping ring 23, the controller controls the electromagnet in the cleaning hole 31 to be powered off, and then the electromagnet loses its magnetic force after being powered off, and the sliding ring 33 immediately loses its magnetic attraction, and then the sliding ring 33 moves under the action of the spring elastic force, and the sliding ring 33 moves to the side away from the cleaning hole 31. When the sliding ring 33 moves, it drives the cleaning brush to move, and the cleaning brush extends from the cleaning hole 31 to the inside of the cylindrical cavity 11, and the extended cleaning brush contacts the surface of the die casting;

[0050] Then, the controller controls the electromagnetic coil in the inner wall of the cleaning hole 31 to be energized. Since the sliding ring 33 is a magnetic conductor, the sliding ring 33 generates a rotational force under the influence of the magnetic force of the electromagnetic coil. The sliding ring 33 then rotates around the axis of the cleaning hole 31. When the sliding ring 33 rotates, the cleaning brush is driven to rotate. When the cleaning brush rotates, the burrs on the surface of the die casting are polished and cleaned.

[0051] During the grinding process of the die casting, the controller controls the No. 1 motor to start, and the driving shaft of the No. 1 motor drives the conveying wheel 26 to rotate. When the conveying wheel 26 rotates, it contacts the surface of the die casting with friction, and then the die casting moves along the axis of the cylindrical cavity 11 under the action of friction. During this process, the controller controls the No. 1 motor to move back and forth, so that the die casting moves back and forth in the two cylindrical cavities 11 along the axis of the cylindrical cavity 11. During the movement of the die casting, the area clamped by the auxiliary plate 24 will also enter the cylindrical cavity 11 for cleaning, so that the die casting is cleaned without dead angles, thereby improving the cleaning effect of the die casting;

[0052] During the cleaning process of the die casting, the controller controls the air pump to start the cabinet, the air pump extracts the outside air, and delivers it to the air delivery ring 27 through the pipeline, and finally delivers it to the input port 12 through the air delivery port. The air is delivered to the cylindrical cavity 11 through the input port 12, and the air flows in the gap between the cylindrical cavity 11 and the die casting. Since the rotation of the electromagnetic coil and the cleaning of the cleaning brush will generate a large amount of heat, the heat is output after the gas is input, so that the die casting and the cylindrical cavity 11 are cooled, and the output air carries the heat and the debris generated by the cleaning to the suction pipe 32, and is delivered to the storage box through the suction pipe 32. After being filtered by the filter, the debris is stored in the storage box;

[0053] When the cleaning is completed, the controller controls the electromagnet in the cleaning hole 31 to be energized, and then the electromagnet attracts the sliding ring 33, and the sliding ring 33 moves to the side close to the cleaning hole 31. When the sliding ring 33 moves, it drives the cleaning brush to move. During the process of the cleaning brush shrinking toward the cleaning hole 31, the cleaning brush encounters the extension bar 321, so that the cleaning brush is separated under the action of the extension bar 321, and then the debris remaining between the cleaning brushes falls, thereby achieving the self-cleaning effect of the cleaning brush, avoiding the accumulation of debris in the cylindrical cavity 11 or the cleaning hole 31, thereby affecting the normal operation of the equipment;

[0054] After self-cleaning, the cylindrical cavity 11 moves to the opposite side, so that the die-casting part is separated from the two cylindrical cavities 11 , and finally the rotating body 22 drives the die-casting part to separate from between the two cylindrical cavities 11 .

[0055] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A die casting cleaning device with self-cleaning function, characterized in that: A processing body (1), the processing body (1) is composed of two cylindrical cavities (11), an input port (12) is arranged on the opposite side of the two cylindrical cavities (11), a slideway (13) is arranged at the bottom of the cylindrical cavity (11), the cylindrical cavity (11) slides on the slideway (13), a clamping component (2) is arranged between the two cylindrical cavities (11), and a cleaning component (3) is arranged in the cylindrical cavity (11).

2. The die casting cleaning device with self-cleaning function according to claim 1, characterized in that: The clamping assembly (2) is composed of a fixed body (21) and a rotating body (22), wherein the fixed body (21) is rotatably connected to the rotating body (22), the fixed body (21) is arranged on one side of the slideway (13), a rotating motor is arranged in the fixed body (21), and a driving shaft of the rotating motor is connected to the rotating body (22).

3. The die casting cleaning device with self-cleaning function according to claim 2, characterized in that: A clamping ring (23) is arranged on the side of the rotating body (22) away from the fixed body (21), a plurality of auxiliary plates (24) are arranged inside the clamping ring (23), a push cylinder is arranged in the inner wall of the clamping ring (23), a push rod of the push cylinder is connected to the auxiliary plate (24), and the auxiliary plate (24) is arc-shaped.

4. The die casting cleaning device with self-cleaning function according to claim 3, characterized in that: A rotating groove (25) is arranged at the center of the auxiliary plate (24), a plurality of conveying wheels (26) are rotatably connected in the rotating groove (25), the conveying wheels (26) are rotatably connected to the rotating groove (25), a No. 1 motor is arranged in the rotating groove (25), and a driving shaft of the No. 1 motor is connected to the conveying wheels (26).

5. The die casting cleaning device with self-cleaning function according to claim 1, characterized in that: The cleaning assembly (3) comprises: a cleaning hole (31), the number of the cleaning holes (31) is several, the several cleaning holes (31) are arranged around the axis of the cylindrical cavity (11), an air suction pipe (32) is arranged in the cleaning hole (31), a storage box is arranged outside the circular cavity (11), the air suction pipe (32) is connected to the storage box through a pipeline, the storage box is provided with filter holes, a sliding ring (33) is also arranged in the cleaning hole (31), a rotating block (331) is arranged on the side of the sliding ring (33) close to the cleaning hole (31), a plurality of springs are arranged between the sliding ring (33) and the rotating block (331), one side of the spring is connected to the sliding ring (33), and the other side of the spring is connected to the rotating block (331), the sliding ring (33) is a magnetic conductor, an electromagnet is arranged on the side of the cleaning hole (31) away from the spring, and an electromagnetic coil is arranged in the inner wall of the cleaning hole (31).

6. The die casting cleaning device with self-cleaning function according to claim 5, characterized in that: The sliding ring (33) is slidably connected to the cleaning hole (31); a plurality of cleaning brushes are arranged on a side of the sliding ring (33) away from the cleaning hole (31); and the plurality of cleaning brushes are arranged around the axis of the sliding ring (33).

7. The die casting cleaning device with self-cleaning function according to claim 5, characterized in that: A plurality of extension strips (321) are arranged on one side of the air suction pipe (32) close to the cleaning brush, and the diameter of the extension strips (321) is greater than the diameter of the air suction pipe (32).

8. The die casting cleaning device with self-cleaning function according to claim 3, characterized in that: An air delivery ring (27) is provided on one side of the clamping ring (23) close to the cylindrical cavity (11), and an air delivery port is provided on the air delivery ring (27), and the air delivery port is connected to an air pump via a pipeline.

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