Hardware casting centrifugal machine capable of efficiently moving mold

Abstract

The invention discloses a hardware casting centrifugal machine capable of efficiently moving a mold, and relates to the technical field of metal casting, the hardware casting centrifugal machine comprises a shell, a storage barrel for storing metal liquid is arranged in the upper part of the shell, and a moving bottom plate for placing the mold is arranged below the shell; and a hydraulic telescopic rod is fixedly connected between the upper surface of the movable bottom plate and the upper part of the shell. According to the hardware casting centrifugal machine capable of efficiently moving the mold, when the mold is placed on the rotating disc, gravity drives a pressing plate to slide down along the rotating disc, a rack on the side wall of the pressing plate and a first gear form transmission, a rotating shaft is driven to rotate to wind a traction rope, the traction rope pulls a limiting block to slide in the radial direction of a moving groove, and two sets of clamping plates are driven to oppositely move through wedge surface transmission; rigid centering clamping of the mold is achieved, so that it is ensured that the mold is axially positioned in the upward moving process, casting deviation is avoided, the embedded extrusion air bag is synchronously extruded when the limiting block slides, compressed air is conveyed into the auxiliary air bag through the first hose after the extrusion air bag is pressed, flexible contact with the mold is formed, and hard contact damage is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of metal casting, in particular to a hardware casting centrifuge with high-efficiency mold transfer. Background Art

[0002] The hardware industry covers the production of many metal products, and centrifugal casting machines play an important role in it. They have obvious advantages in producing hardware parts with specific shapes and performance requirements. In the hardware field, there is a large demand for various metal pipes. Centrifugal casting machines can produce copper pipes, stainless steel pipes, etc., using centrifugal force to make the metal liquid crystallize and solidify under pressure. The casting has a dense structure and few defects such as pores and shrinkage.

[0003] Prior art (Chinese patent with announcement number CN213916028U and announcement date 2021-08-10) A novel vertical centrifuge for casting comprises a motor, a rotating shaft, a transverse plate, a casting mould and a trough body, wherein a casting mould is arranged in the trough body, the rotating shaft passes through the through holes opened on the transverse plate and the trough body and is fixedly connected to the bottom of the casting mould, a bearing seat is fixedly installed on the bottom of the transverse plate, and the rotating shaft is rotatably installed in the bearing seat, a cooling jacket is arranged on the periphery of the trough body, the cooling jacket is hollow, and an air inlet and outlet for fixed connection of an air inlet pipe and an air outlet pipe are opened on the outer surface of the cooling jacket, by arranging an air inlet pipe, an air outlet pipe and a cooling jacket, cold air is introduced into the cooling jacket through the air inlet pipe to cool the trough body and the casting mould, thereby accelerating the cooling speed of the casting mould, shortening the cooling time of the casting and improving the production efficiency, and by arranging a fixed foot, the threaded rod is passed through the threaded through hole on the fixed foot, so that the fixed foot is fixedly installed on the ground, thereby realizing the centrifugal The fixation of the centrifuge increases the stability of the device. There is also prior art 2 (Chinese patent with announcement number CN219683902U and announcement date of 2023-09-15) a new type of casting centrifuge, including a base, one side of the base is rotatably connected to the casting centrifuge, one side of the base is fixedly connected to a motor, one side of the casting centrifuge is rotatably connected to a piece removal cover, one side of the casting centrifuge is slidably connected to a top plate, and one side of the casting centrifuge is fixedly connected to a cylinder; one side of the base is fixedly connected to a support platform, one side of the support platform is provided with a rotating rod clamping hole, and the molten steel is poured into the casting centrifuge through the through hole, and the motor drives the casting centrifuge to rotate, thereby completing the casting. After the casting is completed, the piece removal cover is rotated to move above the casting centrifuge, and then the cylinder is started to move forward against the top plate, thereby ejecting the casting out of the casting centrifuge. The device is simple, practical, and effectively improves work efficiency.

[0004] Although the casting centrifuge in the existing technology can eject castings, it can only be used to take castings. When meeting the casting needs of different models and styles of castings, the current reliance on manual alignment and installation of the mold on the centrifugal device has certain limitations. Since the disassembly and assembly process involves many tedious steps, it not only consumes a lot of time and manpower, but also greatly reduces the overall work efficiency.

[0005] Therefore, we proposed a hardware casting centrifuge with high efficiency mold transfer in order to solve the problems raised above. Summary of the Invention

[0006] The purpose of the present invention is to provide a hardware casting centrifuge with efficient mold transfer, so as to solve the problem raised in the above background technology that when meeting the casting needs of different models and styles of castings in the current market, the mold is currently manually aligned and installed on the centrifugal device, which has certain limitations. Since the disassembly and assembly process involves many tedious steps, it not only consumes a lot of time and manpower, but also greatly reduces the overall work efficiency.

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a metal casting centrifuge with high-efficiency mold transfer, comprising a shell, a storage bucket for storing molten metal is provided inside the upper part of the shell, and a movable base plate for placing the mold is provided below the shell, and a hydraulic telescopic rod is fixedly connected between the upper surface of the movable base plate and the upper part of the shell, a rotating turntable is rotatably provided at the center of the movable base plate, and a limiting mechanism is provided on the rotating turntable, the limiting mechanism realizes limited clamping of the processing mold by movement of the pressure plate contained therein, an auxiliary mechanism is provided between the side of the rotating turntable and the upper surface of the shell, the auxiliary mechanism realizes further limiting of the processing mold by indirect expansion of the sealing airbag contained therein.

[0008] Preferably, a motor is fixedly connected to the lower surface of the shell, and a connecting shaft is fixedly connected to the output end of the motor, and the connecting shaft is rotatably connected to the shell.

[0009] Preferably, a second gear is fixedly connected to the outer side of the connecting shaft, and two groups of second gears are symmetrically distributed about the center point of the shell. A linkage gear ring that meshes with the second gear is fixedly connected to the outer side of the rotating turntable.

[0010] Preferably, the limiting mechanism includes a rotating shaft, which is rotatably connected to the inside of the rotating turntable, and the middle section of the rotating shaft is fixedly connected to the first gear, and a traction rope is wound around the side of the rotating shaft.

[0011] Preferably, the pressing plate is arranged on the rotating turntable through sliding, and a first spring is fixedly connected between the upper side lower surface of the pressing plate and the upper surface of the rotating turntable, and the left and right sides of the pressing plate are provided with tooth blocks meshing with the first gear, and the first gear drives the rotating shaft to rotate through the meshing of the tooth blocks.

[0012] Preferably, the upper surface of the rotating turntable is symmetrically provided with two groups of moving grooves, the inside of the moving grooves is slidably connected with a limiting block, the upper end of the limiting block is fixedly connected with a clamping plate, a second spring for driving the limiting block to move and reset is fixedly connected between the inside of the limiting block and the moving groove, and the inside of the limiting block is fixedly connected with the other end of the traction rope.

[0013] Preferably, the clamping plate is arranged in an arc-shaped structure, the inside of the clamping plate is fixedly connected with an auxiliary air bag in flexible contact with the outside of the processing mold, and a squeeze air bag is further fixedly connected between the inside of the limiting block and the moving groove.

[0014] Preferably, the auxiliary mechanism comprises a fixed disc fixedly connected to the upper end of the connecting shaft, and the upper surface of the fixed disc is fixedly connected with two groups of arc-shaped raised plates, and the side of the arc-shaped raised plate is arranged in an inclined structure.

[0015] Preferably, the upper side of the shell is fixedly connected with a gas supply box, the inside of the gas supply box is slidably connected with a moving plate, the lower surface of the moving plate is fixedly connected with a sliding rod slidably and penetratingly connected with the lower side of the gas supply box, the lower end of the sliding rod is rotatably connected with a roller, the roller is in contact with the side of the arc-shaped raised plate, the upper side of the shell is fixedly connected with a fixed ring, the inside of the fixed ring is fixedly connected with a sealing air bag, and the lower side of the sealing air bag is penetratingly provided with a second hose between the upper side of the gas supply box.

[0016] Compared with the prior art, the beneficial effects of the present application are: (1) The processing mold is accurately positioned by the limiting mechanism and stably arranged on the upper surface of the rotating turntable, after the hydraulic telescopic rod is started, the processing mold and the discharge port of the storage barrel form a sealed butt joint, at this time the motor is started, the second gear is engaged with the linkage gear ring fixed on the rotating turntable to drive the rotating turntable to rotate at a set speed, so that the metal liquid in the processing mold is completed under the action of centrifugal force, the transmission mechanism accurately controls the rotating speed through the gear reduction ratio, and cooperates with the displacement accuracy of the hydraulic system, which significantly improves the process stability and production efficiency of centrifugal casting.

[0017] (2) When the mold is placed on the rotating turntable, gravity drives the pressure plate to slide down the turntable. The rack on its side wall and the first gear form a transmission, and drive the rotating shaft to rotate and reel in the traction rope. The traction rope pulls the limit block to slide radially along the moving groove, and drives the two sets of clamping plates to move toward each other through the wedge surface transmission, realizing the rigid centering clamping of the mold, thereby ensuring the axial positioning of the mold during the upward movement process and avoiding casting deviation.

[0018] (3) When the limit block slides, the embedded extrusion airbag is squeezed synchronously. After the extrusion airbag is pressurized, compressed air is transported to the inside of the auxiliary airbag through the first hose, and the mold forms a flexible contact to avoid hard contact damage.

[0019] (4) After the mold is taken out, the pressure plate moves upward under the drive of the first spring and drives the rotating shaft to rotate in the opposite direction, synchronously realizing the unwinding of the traction rope. The limit block moves outward and resets under the action of the second spring. The double springs work together to drive the clamping plate to separate radially, thereby improving the efficiency of mold replacement.

[0020] (5) When the connecting shaft rotates, the fixed disk drives the arc-shaped raised plate to make synchronous circular motion. The arc-shaped raised plate periodically pushes the roller to drive the slide rod to move vertically upward. The slide rod converts the linear motion into the reciprocating extrusion of the moving plate in the air supply box, causing the sealing airbag to expand intermittently, ensuring the stability of the axial positioning accuracy of the mold during centrifugal casting. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of a three-dimensional cross-sectional structure of the present invention; Figure 3 This is a schematic diagram of the three-dimensional structure of the rotating turntable of the present invention; Figure 4 This is a schematic diagram of a three-dimensional cross-sectional structure of a rotating turntable of the present invention; Figure 5 This is a schematic diagram of the three-dimensional structure of the pressing plate of the present invention; Figure 6 This is a schematic diagram of the three-dimensional structure of the clamping plate of the present invention; Figure 7 This is a schematic diagram of the three-dimensional structure of the air supply box of the present invention; Figure 8 This is a schematic diagram of the three-dimensional cross-sectional structure of the air supply box of the present invention; Figure 9 It is a schematic diagram of the three-dimensional structure of the arc-shaped raised plate of the present invention.

[0022] In the figure: 1. Shell; 2. Storage barrel; 3. Moving base plate; 4. Hydraulic telescopic rod; 5. Fixed ring; 6. Sealing airbag; 7. Air supply box; 8. Sliding rod; 9. Rotating turntable; 10. Fixed plate; 11. Arc-shaped raised plate; 12. Pressing plate; 13. Rotating shaft; 14. First gear; 15. Moving groove; 16. Moving plate; 17. Clamping plate; 18. Auxiliary airbag; 19. First spring; 20. Second gear; 21. Linking gear ring; 22. Motor; 23. Connecting shaft; 24. Traction rope; 25. Extrusion airbag; 26. Limit block; 27. Second spring; 28. First hose; 29. ​​Second hose; 30. Roller. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0024] Example 1: A second gear 20 and a linkage gear ring 21 are provided. The rotation of the mold is achieved by meshing the second gear 20 with the linkage gear ring 21 fixed to the rotating turntable 9, so that the molten metal crystallizes and solidifies under pressure, thereby improving the density of the casting structure. Figures 1-3 The technical solution shown discloses that: a storage barrel 2 for storing molten metal is provided inside the upper part of the shell 1, and a movable base plate 3 for placing the mold is provided below the shell 1, and a hydraulic telescopic rod 4 is fixedly connected between the upper surface of the movable base plate 3 and the upper part of the shell 1, and a motor 22 is fixedly connected to the lower surface of the shell 1, and the output end of the motor 22 is fixedly connected to the connecting shaft 23, and the connecting shaft 23 is rotatably connected to the shell 1, and the outer side of the connecting shaft 23 is fixedly connected to the second gear 20, and the second gear 20 is symmetrically distributed in two groups about the center point of the shell 1, and the outer side of the rotating turntable 9 is fixedly connected to a linkage gear ring 21 that meshes with the second gear 20.

[0025] Under the precise limiting action of the limiting mechanism, the processing mold can be firmly placed on the upper surface of the rotating turntable 9 set at the center of the mobile base plate 3. After the processing mold is properly placed, the hydraulic telescopic rod 4 is started. Under the drive of the hydraulic telescopic rod 4, the mobile base plate 3 moves upward smoothly as a whole, so that the processing mold is accurately docked to the bottom of the storage barrel 2, and the motor 22 is started. The output end of the motor 22 is fixedly connected to the connecting shaft 23. When the motor is running, it drives the connecting shaft 23 to rotate, and then drives the second gear 20 to rotate. Since the second gear 20 and the linkage gear ring 21 are engaged with each other, the second gear 20 will drive the linkage gear ring 21 to rotate synchronously when it rotates, and the linkage gear ring 21 is connected to the rotating turntable 9, so it finally drives the turntable 9 to rotate, so that the processing mold placed on the rotating turntable 9 rotates synchronously, realizing the centrifugal casting process and effectively improving the casting efficiency.

[0026] Example 2: In order to reduce the manual process of aligning and installing the mold into the centrifugal device, the disassembly and assembly process involves many tedious steps. A limiting mechanism is disclosed, which realizes the rigid centering and clamping of the mold, thereby ensuring the axial positioning of the mold during the upward movement process and avoiding casting deviation. Figures 3-6 The technical solution shown discloses that: a rotating turntable 9 is rotatably provided at the center of the movable base plate 3, and a limiting mechanism is provided on the rotating turntable 9. The limiting mechanism realizes the limiting clamping of the processing mold by the movement of the pressure plate 12 contained therein. The limiting mechanism includes a rotating shaft 13, which is rotatably connected to the inside of the rotating turntable 9, and the middle section of the rotating shaft 13 is fixedly connected to the first gear 14, and a traction rope 24 is wound around the side of the rotating shaft 13. The pressure plate 12 is slidably provided on the rotating turntable 9, and a first spring 19 is fixedly connected between the upper and lower surfaces of the pressure plate 12 and the upper surface of the rotating turntable 9, and tooth blocks meshing with the first gear 14 are provided on the left and right sides of the pressure plate 12, and the first gear 14 drives the rotating shaft 13 through the meshing action of the tooth blocks. The rotating turntable 9 is symmetrically provided with two groups of movable grooves 15, and the internal sliding connection of the movable groove 15 is connected to the limit block 26, and the upper end of the limit block 26 is fixedly connected to the clamping plate 17, and the inner side of the limit block 26 and the movable groove 15 are fixedly connected with a second spring 27 for driving the limit block 26 to move and reset, and the inner side of the limit block 26 is fixedly connected to the other end of the traction rope 24, the clamping plate 17 is arranged in an arc-shaped structure, and the inner side of the clamping plate 17 is fixedly connected with an auxiliary airbag 18 that is in flexible contact with the outer side of the processing mold, and the inner side of the limit block 26 and the movable groove 15 are also fixedly connected with an extrusion airbag 25, and a first hose 28 that provides a channel for gas exchange is provided between the upper side of the extrusion airbag 25 and the lower side of the auxiliary airbag 18.

[0027] When the user places the mold to be processed on the upper surface of the rotating turntable 9, the processing mold will squeeze the pressure plate 12 under the action of its own gravity, so that the pressure plate 12 slides downward along the inside of the rotating turntable 9. At this time, the straight rack set on the side wall of the pressure plate 12 and the first gear 14 constitute a gear rack transmission mechanism, which drives the rotating shaft 13 to rotate synchronously during the downward movement. At this time, the rotating shaft 13 can reel in the traction rope 24 wrapped around its outside, so that the traction rope 24 pulls the limit block 26 and drives the limit block 26 to slide stably along the inside of the moving groove 15. The sliding limit block 26 can also synchronously drive the two sets of clamping plates 17 to move toward each other, thereby limiting and clamping the mold to be processed, avoiding the deviation and shaking of the mold to be processed when it moves up, and finally achieving precise centering and rigid clamping of the mold, affecting the effect of subsequent centrifugal casting. When the limit block 26 moves During the process, the limit block 26 can also synchronously squeeze the embedded extrusion airbag 25, so that the extrusion airbag 25 can transport the internal gas to the interior of the auxiliary airbag 18 through the first hose 28, so that the auxiliary airbag 18 expands. The expanded auxiliary airbag 18 can flexibly limit the processing mold that needs to be clamped and limited, so as to avoid damage to the mold and affect the product production quality. When the mold is taken out, the pressure plate 12 can be moved up and reset under the drive of the elastic force of the first spring 19, and the transmission pair composed of the spur rack and the first gear 14 drives the rotating shaft 13 to rotate in the opposite direction, and synchronously realizes the unwinding action of the traction rope 24. The limit block 26 is also driven outward and reset by the elastic force of the second spring 27. The mutual cooperation of the first spring 19 and the second spring 27 can realize the movement and reset of the clamping plate 17, thereby facilitating the removal and replacement of the mold.

[0028] Example 3: In order to solve the problem that the upper end of the processing mold falls due to inertia during centrifugal rotation, a sealing airbag 6 is disclosed. The upper end of the processing mold is limited by the indirect expansion of the sealing airbag 6. Figures 7-9The technical solution shown in the figure discloses that: an auxiliary mechanism is provided between the side of the rotating turntable 9 and the upper surface of the shell 1, and the auxiliary mechanism further limits the processing mold by indirectly expanding the sealing airbag 6 contained therein, and the auxiliary mechanism includes a fixed plate 10, which is fixedly connected to the upper end of the connecting shaft 23, and the upper surface of the fixed plate 10 is fixedly connected to two groups of arc-shaped raised plates 11, and the sides of the arc-shaped raised plates 11 are arranged in an inclined structure, and the upper side of the shell 1 is fixedly connected to The air supply box 7 is provided with an air supply box 7, and the interior of the air supply box 7 is slidably connected to a movable plate 16, and the lower surface of the movable plate 16 is fixedly connected to a slide rod 8 that is slidably connected to the lower side of the air supply box 7. At the same time, the lower end of the slide rod 8 is rotatably connected to a roller 30, and the roller 30 is in contact with the side of the arc-shaped raised plate 11. The upper side of the shell 1 is fixedly connected to a fixing ring 5, and the inner side of the fixing ring 5 is fixedly connected to a sealing airbag 6, and a second hose 29 is provided between the lower side of the sealing airbag 6 and the upper side of the air supply box 7.

[0029] During the rotation of the connecting shaft 23, the arc-shaped raised plate 11 is driven to perform synchronous circular motion through the fixed disk 10. The curved surface of the arc-shaped raised plate 11 periodically pushes the roller 30, and the roller 30 drives the slide bar 8 to move upward. After moving upward, the slide bar 8 can drive the movable plate 16 to slide along the inside of the air supply box 7, and convert the linear motion into the reciprocating extrusion of the movable plate 16 in the air supply box 7. The compressed air in the box is injected into the sealing airbag 6 through the second hose 29. At this time, the sealing airbag 6 can expand, thereby further limiting the completed processing mold in position. The intermittent expansion of the sealing airbag 6 is used to limit the upper end of the processing mold to prevent the mold from tipping over during centrifugal rotation.

[0030] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A metal casting centrifuge with high efficiency mold transfer, comprising a housing (1), wherein a storage bucket (2) for storing metal liquid is provided inside the upper part of the housing (1), and a movable bottom plate (3) for placing the mold is provided below the housing (1), and a hydraulic telescopic rod (4) is fixedly connected between the upper surface of the movable bottom plate (3) and the upper part of the housing (1), characterized in that: A rotating turntable (9) is rotatably provided at the center of the movable base plate (3), and a limiting mechanism is provided on the rotating turntable (9). The limiting mechanism realizes limiting clamping of the processing mold by the movement of the pressure plate (12) contained therein. An auxiliary mechanism is provided between the side of the rotating turntable (9) and the upper surface of the shell (1). The auxiliary mechanism realizes further limiting of the processing mold by the indirect expansion of the sealing airbag (6) contained therein.

2. The high-efficiency mold-transferring centrifuge for metal casting according to claim 1, characterized in that: The lower surface of the housing (1) is fixedly connected to a motor (22), and the output end of the motor (22) is fixedly connected to a connecting shaft (23), and the connecting shaft (23) is rotatably connected to the housing (1).

3. The high-efficiency mold-transferring centrifuge for metal casting according to claim 2, characterized in that: The outer side of the connecting shaft (23) is fixedly connected to a second gear (20), and two groups of second gears (20) are symmetrically distributed about the center point of the housing (1). The outer side of the rotating turntable (9) is fixedly connected to a linkage gear ring (21) that meshes with the second gear (20).

4. The high-efficiency mold-transferring centrifuge for metal casting according to claim 1, characterized in that: The limiting mechanism includes a rotating shaft (13), the rotating shaft (13) is rotatably connected to the inside of the rotating turntable (9), the middle section of the rotating shaft (13) is fixedly connected to the first gear (14), and a traction rope (24) is wound around the side of the rotating shaft (13).

5. The high-efficiency mold-transferring centrifuge for metal casting according to claim 4, characterized in that: The pressure plate (12) is slidably arranged on the rotating turntable (9), and a first spring (19) is fixedly connected between the upper lower surface of the pressure plate (12) and the upper surface of the rotating turntable (9), and tooth blocks that mesh with the first gear (14) are provided on the left and right sides of the pressure plate (12), and the first gear (14) drives the rotating shaft (13) to rotate through the meshing action of the tooth blocks.

6. The high-efficiency mold-transferring centrifuge for metal casting according to claim 4, characterized in that: Two groups of movable grooves (15) are symmetrically provided on the upper surface of the rotating turntable (9), and the inner portion of the movable groove (15) is slidably connected to a limit block (26), and the upper end of the limit block (26) is fixedly connected to a clamping plate (17), and a second spring (27) for driving the limit block (26) to move and reset is fixedly connected between the inner side of the limit block (26) and the movable groove (15), and the inner side of the limit block (26) is fixedly connected to the other end of the traction rope (24).

7. The high-efficiency mold-transferring centrifuge for metal casting according to claim 6, characterized in that: The clamping plate (17) is arranged in an arc-shaped structure, and the inner side of the clamping plate (17) is fixedly connected to an auxiliary air bag (18) that is in flexible contact with the outer side of the processing mold. The inner side of the limit block (26) is also fixedly connected to an extrusion air bag (25) between the inner side and the movable groove (15), and a first hose (28) that provides a channel for gas exchange is provided between the upper side of the extrusion air bag (25) and the lower side of the auxiliary air bag (18).

8. The high-efficiency mold-transferring centrifuge for metal casting according to claim 1, characterized in that: The auxiliary mechanism comprises a fixed disk (10), the fixed disk (10) being fixedly connected to the upper end of the connecting shaft (23), and two groups of arc-shaped raised plates (11) being fixedly connected to the upper surface of the fixed disk (10), and the sides of the arc-shaped raised plates (11) are arranged in an inclined structure.

9. The high-efficiency mold-transferring centrifuge for metal casting according to claim 8, characterized in that: The upper side of the shell (1) is fixedly connected to an air supply box (7), and the interior of the air supply box (7) is slidably connected to a movable plate (16), and the lower surface of the movable plate (16) is fixedly connected to a slide rod (8) that is slidably connected to the lower side of the air supply box (7), and the lower end of the slide rod (8) is rotatably connected to a roller (30), and the roller (30) contacts the side of the arc-shaped raised plate (11), the upper side of the shell (1) is fixedly connected to a fixing ring (5), and the inner side of the fixing ring (5) is fixedly connected to a sealing airbag (6), and a second hose (29) is provided between the lower side of the sealing airbag (6) and the upper side of the air supply box (7).

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