Portable automobile tire changing device

Abstract

The utility model discloses a portable automobile tire changing device, which belongs to the field of automobile tire changing and comprises a distance adjusting mechanism, and a first pushing and pressing mechanism and a second pushing and pressing mechanism are annularly arranged on the peripheral side of the distance adjusting mechanism. The distance adjusting mechanism comprises a conical distance adjusting part capable of axially moving, an outer gear ring is rotationally mounted outside the conical distance adjusting part, and a double-gear transmission part meshed with the outer gear ring is annularly arranged on the outer side of the outer gear ring; the first pushing and pressing mechanism and the second pushing and pressing mechanism are arranged on the peripheral side of the conical distance adjusting part and are in sliding fit with the outer wall of the conical distance adjusting part. The first pushing and pressing mechanism and the second pushing and pressing mechanism each comprise a pushing and pressing control part meshed with the corresponding double-gear transmission part, an arc-shaped pushing and pressing plate controlled by the pushing and pressing control part to move is arranged on one side of the pushing and pressing control part, and the arc-shaped pushing and pressing plates arranged in the annular direction synchronously and axially move. According to the tire replacement device, the tire replacement efficiency can be improved through the synchronous extrusion effect of the arc-shaped pushing and pressing plates which are annularly arranged.

Description

Technical Field

[0001] This utility model relates to the field of car tire changing, and more specifically, to a portable car tire changing device. Background Technology

[0002] Car tires are one of the most important components of a car. They come into direct contact with the road surface and, together with the car's suspension, work to absorb the impacts the car experiences while driving, ensuring good ride comfort and smooth driving, good adhesion between the wheels and the road surface, and improving the car's traction, braking, and passability. During driving, car tires can burst or leak air due to various factors, thus requiring tire replacement.

[0003] Chinese patent CN210970538U discloses a portable tire removal device, including a bracket and two lead screws. The bracket has a support beam and two support rods. The two support rods are arranged in parallel and perpendicular to the support beam. The two support rods are respectively installed at both ends of the support beam. One end of the support rod is fixedly connected to the support beam, and the other end of the support rod is provided with a pressure-bearing part for pressing against the tire. The support beam also has two through holes arranged at intervals, which are opened in a direction parallel to the support rods. The two lead screws pass through the two through holes respectively. The end of the lead screw near the pressure-bearing part is a fixed end, and the other end of the lead screw is a threaded end. A locking nut is sleeved on the threaded end. The locking nut and the lead screw are threaded together and press against the support beam.

[0004] While the aforementioned tire removal device solves the problem of low efficiency in traditional tire changing methods, it primarily relies on two pressure-bearing parts at diagonal positions to compress and remove the tire. Furthermore, it requires synchronized rotation of the two sleeves to ensure uniform pressure on the tire, further contributing to the low efficiency of the tire changing process. Therefore, we provide a portable car tire changing device to address these issues. Utility Model Content

[0005] 1. Technical problems to be solved

[0006] In view of the problems existing in the prior art, the purpose of this utility model is to provide a portable car tire changing device that can achieve the uniformity of the compression force on various parts of the tire, thereby ensuring the efficiency of tire changing work.

[0007] 2. Technical Solution

[0008] To solve the above problems, the present invention adopts the following technical solution.

[0009] A portable car tire changing device includes a tire adjustment mechanism. The tire adjustment mechanism has a first pushing mechanism and a second pushing mechanism arranged circumferentially around its periphery, which slide radially with the adjustment mechanism. The tire adjustment mechanism includes an axially movable conical adjusting section. An external gear ring, coaxial with the conical adjusting section, is rotatably mounted on the outside of the conical adjusting section. A double gear transmission section, meshing with the external gear ring, is arranged circumferentially on the outer side of the external gear ring. The first and second pushing mechanisms are arranged around the periphery of the conical adjusting section, and both slide with the outer wall of the conical adjusting section. Each of the first and second pushing mechanisms includes a pushing control section that meshes with a corresponding double gear transmission section. An arc-shaped pushing plate, controlled by the pushing control section, is located on one side of the pushing control section, and the circumferentially arranged arc-shaped pushing plates move synchronously axially.

[0010] Furthermore, the adjusting mechanism also includes an adjusting base plate, one side of which is connected to a first mounting ring via several axial fixing members, and the circumferential side of the first mounting ring is connected to a second mounting ring via several radial fixing members. The external gear ring and the double gear transmission part are both rotatably mounted on the second mounting ring.

[0011] Furthermore, the tapered adjusting part is disposed inside the first mounting ring and the two are coaxially arranged. An adjusting screw is rotatably mounted on the surface of the adjusting base plate. The tapered adjusting part is sleeved on the adjusting screw and the two are threaded together. Several oblique channels are arranged in a circumferential array on the outer wall of the tapered adjusting part. A radial channel corresponding to the oblique channel is opened on the side of the adjusting base plate near the tapered adjusting part.

[0012] Furthermore, the first mounting ring has a plurality of radial ports arranged in a circumferential array on its circumferential side, and a plurality of first eccentric ports arranged in a circumferential array on its circumferential side. The first eccentric ports are arranged in a one-to-one correspondence with the radial ports. The tapered adjusting part has a plurality of second eccentric ports arranged in a circumferential array on its circumferential side, and the positions of the second eccentric ports are adapted to those of the first eccentric ports.

[0013] Furthermore, both the first and second pressing mechanisms also include a radial support frame, which is slidably engaged with the corresponding radial through-hole. A support rod is fixedly provided on the side of the radial support frame near the tapered adjusting part. A guide ball that is slidably engaged inside the corresponding inclined channel is fixedly installed at the end of the support rod. A movable seat that is slidably connected to the corresponding radial channel is fixedly provided on the periphery of the support rod. An elastic element is connected between the movable seat and the corresponding axial fixing member.

[0014] Furthermore, the pressing control unit includes a pressing control toothed plate, which is adapted to the first eccentric through-hole and the second eccentric through-hole. The pressing control toothed plate is slidably connected to the corresponding radial support frame. A limit plate is fixedly provided on one side of the pressing control toothed plate. The limit plate is connected to the pressing control toothed plate by fasteners. A pressing control rod is slidably provided on the radial support frame. The arc-shaped pressing plate is fixedly installed on the end of the pressing control rod.

[0015] Furthermore, a rotating sleeve sleeved on the push control rod is rotatably mounted on the side of the radial support frame away from the arc-shaped push plate. A transmission gear meshing with the push control toothed plate is fixedly mounted on the circumferential side of the rotating sleeve. A spiral groove is formed on the inner wall of the rotating sleeve. A guide member that slides with the spiral groove is fixed to the end of the push control rod away from the arc-shaped push plate. A rotating force-bearing part is fixedly mounted on the circumferential side of the rotating sleeve on the first push mechanism. A first fixed rod is fixedly mounted on the surface of the radial support frame on the first push mechanism. An internally threaded pipe fitting is rotatably mounted on the end of the first fixed rod. A rotating part is fixedly mounted on the circumferential side of the internally threaded pipe fitting. A linkage plate fixed to the corresponding push control rod is slidably mounted on the first fixed rod. A second fixed rod is fixedly mounted on the surface of the radial support frame on the second push mechanism. A linkage plate fixed to the corresponding push control rod is slidably mounted on the second fixed rod.

[0016] 3. Beneficial effects

[0017] Compared with existing technologies, the advantages of this utility model are:

[0018] (1) In this solution, after adjusting the spacing between the two first fixing rods according to the spacing between the diagonal bolts on the wheel hub corresponding to the tire to be replaced, the two internally threaded pipe fittings are respectively abutted against the diagonal bolts on the wheel hub, and the internally threaded pipe fittings are fixed to the bolts by rotating the rotating part. This fixes the position of the two first pushing mechanisms on the wheel hub. Then, a wrench is used to drive the rotating force part, causing the rotating sleeve on the first pushing mechanism to rotate. The transmission gear on the rotating sleeve rotates, driving the corresponding pushing control tooth plate to move closer to the conical adjusting part. The pushing control tooth plate drives the corresponding double gear transmission part to rotate, and the double gear transmission part drives the entire outer gear ring to rotate. Thus, the outer gear ring drives each double gear transmission part to rotate synchronously, thereby achieving... Under the meshing action of each double gear transmission unit and the corresponding push control tooth plate, each push control tooth plate moves synchronously towards the conical adjustment part, thereby achieving synchronous rotation of each rotating sleeve. During the rotation of the rotating sleeve, the cooperation between the spiral channel and the guide component drives each push control rod to move synchronously towards the tire, thereby driving each arc-shaped push plate to synchronously abut against the tire bead on both sides of the wheel hub. As each push control rod continues to approach the tire, each arc-shaped push plate begins to squeeze the tire bead on both sides of the wheel hub until the tire rubber is concave inward to a certain depth, which can drive the tire rubber to circumferentially separate from the rim, thereby achieving the purpose of simple and quick tire removal. Through the synchronous squeezing action of each circumferentially arranged arc-shaped push plate, the efficiency of tire replacement can be improved.

[0019] (2) By rotating the adjusting screw, since each of the circumferentially arranged guide balls is slidably fitted in the inclined groove on the outer wall of the tapered adjusting part, the tapered adjusting part is driven to move along the axial direction of the first mounting ring under the threaded engagement of the adjusting screw and the tapered adjusting part. In this process, the guide balls slide along the inclined groove, and then the tapered adjusting part squeezes each radial support frame to move radially synchronously. Thus, the distance between the two first pressing mechanisms and the distance between the two second pressing mechanisms can be adjusted to meet the tire replacement needs of different tire models.

[0020] (3) During the process of adjusting the distance between the two first pressing mechanisms and the distance between the two second pressing mechanisms by rotating the adjusting screw, each limiting plate is connected to the corresponding pressing control tooth plate by fasteners, thereby ensuring that each pressing control tooth plate and the corresponding transmission gear will not rotate relative to each other, but will only drive the corresponding double gear transmission part to rotate through each pressing control tooth plate. After the distance adjustment is completed, each fastener is removed to release the fixed position relationship between the limiting plate and the corresponding pressing control tooth plate. Attached Figure Description

[0021] Figure 1This is a schematic diagram of the portable car tire changing device of this utility model.

[0022] Figure 2 for Figure 1 Structural side view;

[0023] Figure 3 This is a schematic diagram of the adjusting mechanism of this utility model;

[0024] Figure 4 for Figure 3 A structural diagram from another angle;

[0025] Figure 5 This is a schematic diagram of the second pushing mechanism of this utility model;

[0026] Figure 6 This is a schematic diagram of the structure of the first pushing mechanism of this utility model;

[0027] Figure 7 for Figure 6 Top view of the structure.

[0028] Explanation of the labels in the diagram:

[0029] 1. Adjusting mechanism; 2. First pressing mechanism; 3. Second pressing mechanism; 4. Conical adjusting part; 5. External gear ring; 6. Double gear transmission part; 7. Arc-shaped pressing plate; 8. Adjusting base plate; 9. Axial fixing component; 10. First mounting ring; 11. Radial fixing component; 12. Second mounting ring; 13. Adjusting screw; 14. Inclined channel; 15. Radial channel; 16. Radial port; 17. First eccentric port; 18. Second eccentric port; 19. Radial support frame; 20. Support rod; 21. Guide ball; 22. Moving seat; 23. Elastic element; 24. Pressing control toothed plate; 25. Limiting plate; 26. Pressing control rod; 27. Rotating sleeve; 28. Transmission gear; 29. ​​Rotating force-bearing part; 30. First fixing rod; 31. Internal threaded pipe fitting; 32. Rotating part; 33. Linkage plate; 34. Second fixing rod. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0031] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" 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 an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] Example 1:

[0034] Please see Figure 1-7 A portable car tire changing device includes a tire adjusting mechanism 1. A first pushing mechanism 2 and a second pushing mechanism 3 are circumferentially arranged around the tire adjusting mechanism 1 and slide radially therewith. The tire adjusting mechanism 1 includes an axially movable conical adjusting section 4. An external gear ring 5, coaxial with the conical adjusting section 4, is rotatably mounted on the outside of the conical adjusting section 4. A double gear transmission section 6, meshing with the external gear ring 5, is arranged in a circumferential array on the outer side of the external gear ring 5. The first pushing mechanism 2 and the second pushing mechanism 3 are arranged around the conical adjusting section 4, and both the first pushing mechanism 2 and the second pushing mechanism 3 slide with the outer wall of the conical adjusting section 4. Each of the first pushing mechanism 2 and the second pushing mechanism 3 includes a pushing control section that meshes with the corresponding double gear transmission section 6. An arc-shaped pushing plate 7, controlled by the pushing control section, is provided on one side of the pushing control section, and the circumferentially arranged arc-shaped pushing plates 7 move synchronously axially.

[0035] In this embodiment of the present invention, the adjusting mechanism 1 further includes an adjusting base plate 8. A first mounting ring 10 is connected to one side of the adjusting base plate 8 by a plurality of axial fixing members 9. A second mounting ring 12 is connected to the circumferential side of the first mounting ring 10 by a plurality of radial fixing members 11. The external toothed ring 5 and the double gear transmission part 6 are both rotatably mounted on the second mounting ring 12. The conical adjusting part 4 is disposed inside the first mounting ring 10 and the two are coaxially arranged. An adjusting screw 13 is rotatably mounted on the surface of the adjusting base plate 8. The conical adjusting part 4 is sleeved on the adjusting screw 13 and the two are threaded together. A plurality of oblique channels 14 are arranged in a circumferential array on the outer wall of the conical adjusting part 4. A radial channel 15 corresponding to the oblique channel 14 is opened on the side of the adjusting base plate 8 near the conical adjusting part 4.

[0036] In this embodiment of the present invention, the first mounting ring 10 is provided with a plurality of radial through-holes 16 arranged in a circumferential array on its circumferential side, and the first mounting ring 10 is provided with a plurality of first eccentric through-holes 17 arranged in a circumferential array on its circumferential side, with the first eccentric through-holes 17 corresponding to the radial through-holes 16 one by one. The tapered adjusting part 4 is provided with a plurality of second eccentric through-holes 18 arranged in a circumferential array on its circumferential side, with the second eccentric through-holes 18 being adapted to the positions of the first eccentric through-holes 17.

[0037] Both the first pressing mechanism 2 and the second pressing mechanism 3 further include a radial support frame 19, which is slidably engaged with the corresponding radial opening 16. A support rod 20 is fixedly installed on the side of the radial support frame 19 near the tapered adjusting part 4. A guide ball 21 that is slidably engaged inside the corresponding inclined channel 14 is fixedly installed at the end of the support rod 20. A movable seat 22 that is slidably connected to the corresponding radial channel 15 is fixedly installed on the circumferential side of the support rod 20. An elastic element 23 is connected between the movable seat 22 and the corresponding axial fixing member 9. By rotating the adjusting screw 13, due to the ring Each of the guide balls 21 arranged in the direction of ...

[0038] Example 2:

[0039] Please see Figure 5-7The pressing control unit includes a pressing control toothed plate 24, which is adapted to the first eccentric through-hole 17 and the second eccentric through-hole 18. The pressing control toothed plate 24 is slidably connected to the corresponding radial support frame 19. A limit plate 25 is fixedly provided on one side of the pressing control toothed plate 24. The limit plate 25 is connected to the pressing control toothed plate 24 by fasteners. A pressing control rod 26 is slidably provided on the radial support frame 19. An arc-shaped pressing plate 7 is fixedly installed on the end of the pressing control rod 26. The pressing control control unit is adjusted by rotating the adjusting screw 13. During the adjustment of the distance between the two first pressing mechanisms 2 and the distance between the two second pressing mechanisms 3, each limiting plate 25 is connected to the corresponding pressing control tooth plate 24 by fasteners, thereby ensuring that each pressing control tooth plate 24 and the corresponding transmission gear 28 will not rotate relative to each other, but will only drive the corresponding double gear transmission part 6 to rotate through each pressing control tooth plate 24. After the distance adjustment is completed, each fastener is removed to release the fixed position relationship between the limiting plate 25 and the corresponding pressing control tooth plate 24.

[0040] In this embodiment of the present invention, a rotating sleeve 27 sleeved on the push control rod 26 is rotatably installed on the side of the radial support frame 19 away from the arc-shaped push plate 7. A transmission gear 28 that meshes with the push control tooth plate 24 is fixedly installed on the circumferential side of the rotating sleeve 27. A spiral groove is opened on the inner wall of the rotating sleeve 27. A guide member that slides with the spiral groove is fixed at the end of the push control rod 26 away from the arc-shaped push plate 7. A rotating force-bearing part 29 is fixedly installed on the circumferential side of the rotating sleeve 27 on a first push mechanism 2.

[0041] A first fixed rod 30 is fixedly mounted on the surface of the radial support frame 19 on the first pressing mechanism 2. An internally threaded pipe fitting 31 is rotatably mounted on the end of the first fixed rod 30. A rotating part 32 is fixedly mounted on the circumferential side of the internally threaded pipe fitting 31. A linkage plate 33, which is fixed to the corresponding pressing control rod 26, is slidably sleeved on the first fixed rod 30. A second fixed rod 34 is fixedly mounted on the surface of the radial support frame 19 on the second pressing mechanism 3. A linkage plate 33, which is fixed to the corresponding pressing control rod 26, is slidably sleeved on the second fixed rod 34. The two first fixed rods are then aligned according to the spacing between the diagonal bolts on the corresponding wheel hub of the tire to be replaced. After the spacing between the fixed rods 30 is adjusted, the two internally threaded pipe fittings 31 are respectively abutted against the diagonal bolts of the wheel hub, and the internally threaded pipe fittings 31 are fixed to the bolts by rotating the rotating part 32. This fixes the position of the two first pushing mechanisms 2 on the wheel hub (i.e., the entire tire changing device is fixed on the wheel hub). Then, a wrench is used to drive the rotating force-bearing part 29, causing the rotating sleeve 27 on the first pushing mechanism 2 to rotate. The transmission gear 28 on the rotating sleeve 27 rotates, driving the corresponding pushing control tooth plate 24 to move closer to the conical adjusting part 4 (in During this process, the push control tooth plate 24 may pass through the first eccentric through-hole 17 and the second eccentric through-hole 18. The push control tooth plate 24 drives the corresponding double gear transmission part 6 to rotate, which in turn drives the entire outer gear ring 5 to rotate. Thus, the outer gear ring 5 drives each double gear transmission part 6 to rotate synchronously. Furthermore, under the meshing action of each double gear transmission part 6 and the corresponding push control tooth plate 24, each push control tooth plate 24 moves synchronously towards the conical adjusting part 4, thereby achieving synchronous rotation of each rotating sleeve 27. As the rotating sleeve 27 rotates... During the process, the spiral channel and the guide component work together to drive each push control rod 26 to move synchronously towards the tire. This causes each arc-shaped push plate 7 to simultaneously come into contact with the tire bead on both sides of the wheel hub. As each push control rod 26 continues to approach the tire, each arc-shaped push plate 7 begins to squeeze the tire bead on both sides of the wheel hub until the tire rubber is concave to a certain depth. This allows the tire rubber to circumferentially separate from the wheel rim, thus achieving the purpose of simple and quick tire removal. The synchronous squeezing action of each circumferentially arranged arc-shaped push plate 7 can improve the efficiency of tire replacement.

[0042] The above description is merely a preferred embodiment of this utility model; however, the protection scope of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and its improved concept, should be included within the protection scope of this utility model.

Claims

1. A portable car tire changing device, characterized in that: It includes a distance adjustment mechanism (1), and the distance adjustment mechanism (1) is provided with a first pushing mechanism (2) and a second pushing mechanism (3) that slide in a radial direction around it; The adjusting mechanism (1) includes a tapered adjusting part (4) that can move axially. An external gear ring (5) coaxial with the tapered adjusting part (4) is rotatably mounted on the outside of the tapered adjusting part (4). A double gear transmission part (6) meshing with the external gear ring (5) is arranged in a circumferential array on the outside of the external gear ring (5). The first pressing mechanism (2) and the second pressing mechanism (3) are arranged on the periphery of the tapered adjusting part (4), and both the first pressing mechanism (2) and the second pressing mechanism (3) slide in cooperation with the outer wall of the tapered adjusting part (4); The first pressing mechanism (2) and the second pressing mechanism (3) both include a pressing control unit that meshes with the corresponding double gear transmission unit (6). An arc-shaped pressing plate (7) is provided on one side of the pressing control unit and moves under its control. Each arc-shaped pressing plate (7) arranged in a circumferential direction moves axially synchronously.

2. The portable car tire changing device according to claim 1, characterized in that: The adjusting mechanism (1) further includes an adjusting base plate (8). A first mounting ring (10) is connected to one side of the adjusting base plate (8) through several axial fixing parts (9). A second mounting ring (12) is connected to the circumferential side of the first mounting ring (10) through several radial fixing parts (11). The external toothed ring (5) and the double gear transmission part (6) are both rotatably mounted on the second mounting ring (12).

3. A portable car tire changing device according to claim 2, characterized in that: The conical adjusting part (4) is disposed inside the first mounting ring (10) and the two are coaxially arranged. The adjusting base plate (8) is rotatably mounted with an adjusting screw (13). The conical adjusting part (4) is sleeved on the adjusting screw (13) and the two are threaded together. The outer wall of the conical adjusting part (4) is provided with a plurality of oblique channels (14) arranged in a circumferential array. The adjusting base plate (8) is provided with radial channels (15) on the side near the conical adjusting part (4) that correspond one-to-one with the oblique channels (14).

4. A portable car tire changing device according to claim 3, characterized in that: The first mounting ring (10) has a plurality of radial ports (16) arranged in a circumferential array on its circumferential side. The first mounting ring (10) has a plurality of first eccentric ports (17) arranged in a circumferential array on its circumferential side. The first eccentric ports (17) are arranged in a one-to-one correspondence with the radial ports (16). The tapered adjusting part (4) has a plurality of second eccentric ports (18) arranged in a circumferential array on its circumferential side. The second eccentric ports (18) are adapted to the positions of the first eccentric ports (17).

5. A portable car tire changing device according to claim 4, characterized in that: Both the first pressing mechanism (2) and the second pressing mechanism (3) further include a radial support frame (19). The radial support frame (19) is slidably engaged with the corresponding radial through-hole (16). A support rod (20) is fixedly provided on the side of the radial support frame (19) near the tapered adjusting part (4). A guide ball (21) that is slidably engaged in the corresponding inclined channel (14) is fixedly installed at the end of the support rod (20). A movable seat (22) that is slidably connected to the corresponding radial channel (15) is fixedly provided on the periphery of the support rod (20). An elastic element (23) is connected between the movable seat (22) and the corresponding axial fixing member (9).

6. A portable car tire changing device according to claim 5, characterized in that: The push control unit includes a push control toothed plate (24), which is adapted to the first eccentric through-hole (17) and the second eccentric through-hole (18). The push control toothed plate (24) is slidably connected to the corresponding radial support frame (19). A limit plate (25) is fixedly provided on one side of the push control toothed plate (24). The limit plate (25) is connected to the push control toothed plate (24) by fasteners. A push control rod (26) is slidably provided on the radial support frame (19). The arc-shaped push plate (7) is fixedly installed on the end of the push control rod (26).

7. A portable car tire changing device according to claim 6, characterized in that: The radial support frame (19) is rotatably mounted on the side away from the arc-shaped push plate (7) with a rotating sleeve (27) sleeved on the push control rod (26). The rotating sleeve (27) is fixedly mounted on the circumferential side with a transmission gear (28) meshing with the push control tooth plate (24). A spiral groove is opened on the inner wall of the rotating sleeve (27). The end of the push control rod (26) away from the arc-shaped push plate (7) is fixed with a guide that slides with the spiral groove. A rotating force-bearing part (29) is fixedly mounted on the circumferential side of the rotating sleeve (27) on the first push mechanism (2). A first fixed rod (30) is fixedly installed on the surface of the radial support frame (19) on the first pressing mechanism (2). An internal threaded pipe fitting (31) is rotatably installed at the end of the first fixed rod (30). A rotating part (32) is fixedly installed on the circumferential side of the internal threaded pipe fitting (31). A linkage plate (33) fixed to the corresponding pressing control rod (26) is slidably sleeved on the first fixed rod (30). A second fixed rod (34) is fixedly installed on the surface of the radial support frame (19) on the second pressing mechanism (3). A linkage plate (33) fixed to the corresponding pressing control rod (26) is slidably sleeved on the second fixed rod (34).

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