Rotary suction cup

Abstract

The utility model provides a rotary suction cup which comprises an attaching piece, the attaching piece is made of flexible materials, and the two sides of the attaching piece are the attaching side and the back side respectively. The traction column is connected to the middle of the back side of the attaching piece. The pressing ring is attached to the back side of the attaching piece, and the traction column movably penetrates through the center of the pressing ring. The outer shell abuts against the side, away from the attaching piece, of the pressing ring, and a driving mechanism used for driving the traction column to move is arranged on the outer shell. According to the utility model, an annular sealing part is further arranged on the periphery of the attaching side of the attaching piece. The rotary suction cup provided by the utility model can improve the use stability.

Description

Technical Field

[0001] The utility model belongs to the technical field of suction cups and relates to a rotary suction cup. Background Art

[0002] The suction cup uses negative pressure to stick to a flat surface, such as tiles, glass, stainless steel, etc., and then the corresponding object can be hung or suspended or supported on the outside.

[0003] Currently, a Chinese patent application with the publication number CN206626078U discloses a new type of suction cup. By configuring the suction cup as a separate component, it prevents displacement during operation and provides excellent position stability. However, in actual use, it was found that this type of suction cup was prone to air ingress at the edges during subsequent use, causing the suction cup to separate from the surface it was attached to, resulting in poor stability. Utility Model Content

[0004] The purpose of the utility model is to provide a rotary suction cup, aiming to solve the problem of poor stability in use.

[0005] In order to solve the above technical problems, the utility model provides a rotary suction cup, comprising:

[0006] A fitting piece, wherein the fitting piece is made of a flexible material, and the two sides of the fitting piece are respectively a fitting side and a back side;

[0007] A traction post connected to the middle portion of the back side of the fitting;

[0008] An annular pressing ring is attached to the back side of the fitting, and the traction column moves through the center of the pressing ring;

[0009] The outer shell is in contact with the side of the pressing ring facing away from the fitting member, and the outer shell is provided with a driving mechanism for driving the traction column to move.

[0010] The present invention is further configured such that an annular sealing portion is provided on the periphery of the bonding side of the bonding piece.

[0011] The utility model is further configured to include a connecting piece, one side of which is fixedly connected to the middle part of the fitting, and the other side is provided with a cylindrical connecting tube, and the end of the traction column is provided with a threaded column threadedly connected to the inner wall of the connecting tube.

[0012] The utility model is further configured such that an annular connecting ring is provided in the middle of the back side of the fitting, an anti-slip ring is provided on the inner side of the free end of the connecting ring, the outer wall of the connecting member is respectively fitted to the middle of the back side, the inner wall of the connecting ring and the inner side of the anti-slip ring, and the outer wall of the connecting ring is separated from the pressing ring.

[0013] The present invention is further configured such that a plurality of anti-rotation holes are opened through the connecting piece, an anti-rotation portion cooperating with the anti-rotation holes is provided on the back side of the fitting, and the free end of the anti-rotation portion is connected to the anti-slip ring.

[0014] The present invention is further configured such that a fitting ring is provided on the outer wall of the connecting tube, and the outer wall of the fitting ring is fitted to the anti-slip ring.

[0015] The utility model is further configured such that the driving mechanism includes a driving disk, an extension tube is provided in the middle of the driving disk, a clearance hole is provided through the extension tube and the middle of the driving disk, an anti-rotation protrusion is provided on the inner wall of the clearance hole, an anti-rotation groove is provided at the end of the connecting tube to cooperate with the anti-rotation protrusion, and the end of the traction column abuts against the end of the extension tube away from the fitting member;

[0016] The inner wall of the outer shell is provided with a driving part, and the edge of the driving disk is provided with a through opening for the driving part to pass through. The side of the driving disk close to the fitting is provided with a driving groove and a clamping groove, one end of the driving groove is communicated with the through opening, and the other end is communicated with the clamping groove, and the depth of the driving groove decreases with increasing distance from the corresponding through opening. When the driving part acts on the inner wall of the driving groove, the driving disk, the traction column, the connecting part and the middle part of the fitting all move outward. When the driving part is engaged with the clamping groove, both sides of the driving part away from one end of the fitting are engaged with the inner wall of the clamping groove.

[0017] The present invention is further configured such that a stop portion is further provided on the edge of the driving disk, and when the driving portion is engaged with the engaging groove, the side portion of the driving portion contacts the stop portion.

[0018] The present invention is further configured as follows: an elastic clip is provided in the through-port, the free end of the elastic clip faces in a direction away from the fitting, and an elastic clip portion is provided on the outer side of the free end of the elastic clip, and the outer side of the elastic clip portion away from one end of the fitting is an inclined driving slope. When the outer shell moves toward the fitting, the driving portion can act on the driving slope and drive the elastic clip to undergo elastic deformation toward the middle of the outer shell. When the outer shell contacts the pressing ring, the side of the elastic clip portion close to the fitting is used to limit the driving portion.

[0019] The present invention is further configured as follows: a plurality of unlocking holes are opened through the outer shell, each of the unlocking holes is directly opposite to one of the elastic clamping parts, an operating disk with a diameter larger than that of the traction column is provided at one end of the traction column away from the fitting, a cylindrical concentric cylinder is provided on the side of the middle part of the pressing ring away from the fitting, all the driving parts are movably fitted to the outer wall of the concentric cylinder, and an air intake operating part is provided at the edge of the fitting.

[0020] Compared with the prior art, the present invention provides a rotary suction cup. When in use, the bonding piece (which is preferably made of a flexible material, such as nitrile rubber, silicone, flexible plastic sheet, etc., which can be used as conventional materials for suction cups) is first bonded to the plane to be bonded (such as glass, ceramic tile, metal surface), and at the same time, the outer shell squeezes the pressing ring inward, and the pressing ring presses the periphery of the bonding piece inward, and there is no air inside the bonding piece (for example, water is sprinkled on the surface of the plane to be bonded, and the bonding piece is gradually bonded to the plane to be bonded); then the traction column is driven outward by the driving mechanism (the driving distance is not large, and the periphery of the bonding piece remains in a state of bonding to the plane to be bonded after the driving is completed), at this time the traction column pulls the middle part of the bonding piece outward, and after the bonding piece undergoes elastic deformation, a large negative pressure is generated between the bonding piece and the plane to be bonded, so that under the action of the external atmospheric pressure, the bonding piece is tightly bonded to the plane to be bonded. The periphery of the outer shell presses the periphery of the bonding piece against the surface to be bonded through a rigid pressing ring, which effectively prevents the outside air from entering between the surface to be bonded and the bonding piece through the periphery of the bonding piece. At the same time, the bonding piece can maintain a bonded state with the surface to be bonded for a long time, and the connection stability is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural diagram of an embodiment of a rotary suction cup of the present utility model;

[0022] Figure 2 This is a cross-sectional view of an embodiment of a rotary suction cup of the present invention;

[0023] Figure 3 yes Figure 2Enlarged view of part A;

[0024] Figure 4 This is an explosion-proof embodiment of a rotary suction cup of the utility model. Figure 1 ;

[0025] Figure 5 This is an explosion-proof embodiment of a rotary suction cup of the utility model. Figure 2 ;

[0026] Figure 6 This is a schematic diagram of an embodiment of a fitting member in a rotary suction cup of the present invention;

[0027] Figure 7 This is a schematic diagram of an embodiment of a connecting piece in a rotary suction cup of the present invention;

[0028] Figure 8 This is a schematic diagram of an embodiment of an outer shell of a rotary suction cup of the present invention;

[0029] Figure 9 This is a schematic diagram of an embodiment of a driving disk in a rotary suction cup of the utility model. Figure 1 ;

[0030] Figure 10 This is a schematic diagram of an embodiment of a driving disk in a rotary suction cup of the utility model. Figure 2 ;

[0031] Figure 11 yes Figure 10 Magnified view of part B.

[0032] Among them, 1. fitting part; 2. traction column; 3. pressing ring; 4. outer shell; 5. sealing part; 6. connecting part; 7. connecting cylinder; 8. threaded column; 9. connecting ring; 10. anti-slip ring; 11. anti-rotation hole; 12. anti-rotation part; 13. matching ring; 14. driving disk; 15. extension cylinder; 16. clearance hole; 17. anti-rotation protrusion; 18. anti-rotation groove; 19. driving part; 20. through-mouth; 21. driving groove; 22. engaging groove; 23. termination part; 24. elastic clip strip; 25. elastic clip part; 26. driving inclined surface; 27. unlocking hole; 28. operating disk; 29. ​​concentric cylinder; 30. air intake operating part. DETAILED DESCRIPTION

[0033] The following is a detailed description of the rotary suction cup proposed by the present invention, with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are greatly simplified and not to exact scale, and are intended solely to facilitate and clearly illustrate the embodiments of the present invention. Identical or similar reference numerals in the drawings represent identical or similar components.

[0034] A rotating suction cup, such as Figures 1 to 11 As shown, including:

[0035] A fitting member 1 is made of a flexible material, and has two sides, namely, a fitting side and a back-facing side;

[0036] A traction post 2 connected to the middle portion of the back side of the fitting 1;

[0037] An annular pressing ring 3 is attached to the back side of the fitting 1, and the traction column 2 moves through the center of the pressing ring 3;

[0038] The outer shell 4 is in contact with the side of the pressing ring 3 facing away from the fitting 1 , and a driving mechanism for driving the traction column 2 to move is provided on the outer shell 4 .

[0039] An annular sealing portion 5 is provided on the periphery of the bonding side of the bonding piece 1 .

[0040] It also includes a connecting piece 6, one side of which is fixedly connected to the middle of the fitting 1, and the other side is provided with a cylindrical connecting tube 7, and the end of the traction column 2 is provided with a threaded column 8 threadedly connected to the inner wall of the connecting tube 7.

[0041] An annular connecting ring 9 is provided in the middle of the back side of the fitting 1, and an anti-slip ring 10 is provided on the inner side of the free end of the connecting ring 9. The outer wall of the connecting member 6 is respectively fitted to the middle of the back side, the inner wall of the connecting ring 9 and the inner side of the anti-slip ring 10, and the outer wall of the connecting ring 9 is separated from the pressing ring 3.

[0042] A plurality of anti-rotation holes 11 are formed through the connecting member 6 , and an anti-rotation portion 12 cooperating with the anti-rotation holes 11 is provided on the back side of the fitting 1 , and the free end of the anti-rotation portion 12 is connected to the anti-slip ring 10 .

[0043] The outer wall of the connecting tube 7 is provided with a matching ring 13 , and the outer wall of the matching ring 13 is in contact with the anti-slip ring 10 .

[0044] The driving mechanism includes a driving disc 14, an extension tube 15 is provided in the middle of the driving disc 14, a clearance hole 16 is provided through the extension tube 15 and the middle of the driving disc 14, an anti-rotation protrusion 17 is provided on the inner wall of the clearance hole 16, and an anti-rotation groove 18 is provided at the end of the connecting tube 7 to cooperate with the anti-rotation protrusion 17. The end of the traction column 2 contacts the end of the extension tube 15 away from the fitting member 1;

[0045] A driving portion 19 is provided on the inner wall of the outer shell 4, and a through-hole 20 is provided on the edge of the driving disk 14 for the driving portion 19 to pass through. A driving groove 21 and a clamping groove 22 are provided on the side of the driving disk 14 close to the fitting 1. One end of the driving groove 21 is communicated with the through-hole 20, and the other end is communicated with the clamping groove 22, and the depth of the driving groove 21 decreases with increasing distance from the corresponding through-hole 20. When the driving portion 19 acts on the inner wall of the driving groove 21, the driving disk 14, the traction column 2, the connecting member 6 and the middle part of the fitting 1 all move outward. When the driving portion 19 is engaged with the clamping groove 22, both sides of the driving portion 19 away from the fitting 1 end are engaged with the inner wall of the clamping groove 22.

[0046] The edge of the driving disk 14 is further provided with a stop portion 23 . When the driving portion 19 is engaged with the engagement groove 22 , the side of the driving portion 19 abuts against the stop portion 23 .

[0047] An elastic clip 24 is provided in the through-portion 20, and the free end of the elastic clip 24 faces in a direction away from the fitting 1, and an elastic clip portion 25 is provided on the outer side of the free end of the elastic clip 24, and the outer side of the elastic clip portion 25 away from one end of the fitting 1 is an inclined driving slope 26. When the outer shell 4 moves toward the fitting 1, the driving portion 19 can act on the driving slope 26 and drive the elastic clip 24 to undergo elastic deformation toward the middle of the outer shell 4. When the outer shell 4 contacts the pressing ring 3, the elastic clip portion 25 is close to the side of the fitting 1 for limiting the driving portion 19.

[0048] A plurality of unlocking holes 27 are provided through the outer shell 4, and each of the unlocking holes 27 is directly opposite to one of the elastic clamping parts 25. An operating disk 28 with a diameter larger than that of the traction column 2 is provided at the end of the traction column 2 away from the fitting 1. A cylindrical concentric cylinder 29 is provided on the side of the middle part of the pressing ring 3 away from the fitting 1. All the driving parts are movably fitted to the outer wall of the concentric cylinder 29, and an air intake operating part 30 is provided at the edge of the fitting 1.

[0049] The utility model provides a rotary suction cup. When in use, the bonding member 1 (which is preferably made of a flexible material, such as nitrile rubber, silicone, flexible plastic sheet, etc., which can be used as conventional materials for suction cups) is first bonded to the surface to be bonded (such as glass, ceramic tile, metal surface), and at the same time, the outer shell 4 squeezes the pressing ring 3 inward, and the pressing ring 3 presses the periphery of the bonding member 1 inward, and there is no air inside the bonding member 1 (for example, water is sprinkled on the surface of the surface to be bonded, and the bonding member 1 is gradually bonded to the surface to be bonded); then the traction column 2 is driven outward by the driving mechanism (the driving distance is not large, and the periphery of the bonding member 1 remains in a state of bonding to the surface to be bonded after the driving is completed), at this time, the traction column 2 pulls the middle part of the bonding member 1 outward, and after the bonding member 1 undergoes elastic deformation, a large negative pressure is generated between the bonding member 1 and the surface to be bonded, so that under the action of the external atmospheric pressure, the bonding member 1 is tightly bonded to the surface to be bonded. The periphery of the outer shell 4 presses the periphery of the bonding piece 1 against the surface to be bonded through the rigid pressing ring 3, which effectively prevents the outside air from entering between the surface to be bonded and the bonding piece 1 through the periphery of the bonding piece 1. At the same time, the bonding piece 1 can maintain a bonded state with the surface to be bonded for a long time, and the connection stability is high.

[0050] When producing the parts in this application, it is necessary to first produce the connector 6, and then produce the fitting 1 and the sealing portion 5, connecting ring 9 and other structures that are integral with the fitting 1 on the basis of the connector 6 (for example, the fitting 1 is extruded after the connector 6 is fixed in a mold; it should also be understood that how the fitting 1 is produced and molded with the connector 6 is an existing feasible technology, and its production process or equipment is not the object of protection claimed in this application). In this way, the connecting ring 9, the anti-slip ring 10, the anti-rotation portion 12 can be formed with the connector 6 and the anti-rotation hole 11. The other parts are produced separately and then assembled.

[0051] During assembly, first fit the pressing ring 3 to the back side of the fitting 1, then sleeve the driving disc 14 and the extension tube 15 (the two are integrated) onto the connecting tube 7, and make the anti-rotation protrusion 17 engage with the anti-rotation groove 18; then, after passing the end of the traction column 2 through the pre-opening in the middle of the outer shell 4, pass the threaded column 8 on the traction column 2 through the extension tube 15 and threadedly connect it to the connecting tube 7 until the end of the driving column finally hits the end of the extension tube 15, so that the traction column 2, the driving disc 14 and the fitting 1 become one through the threaded column 8 and the extension tube 15, and at the same time, the pressing ring 3 is also limited; finally, move the outer shell 4 toward the driving disc 14 (align the driving part 19 with the through-hole 20), and continue to move the outer shell 4; At a certain node, the outer end of the driving part 19 abuts against the driving inclined surface 26 of the elastic clamping part 25, and the driving part 19 causes the elastic clamping part 25 to move toward the middle direction of the outer shell 4 through the action of the driving inclined surface 26, and at the same time causes the elastic clamping strip 24 to undergo elastic deformation; until the driving part 19 just passes over the elastic clamping part 25, at this time, the elastic clamping strip 24 rebounds outward under the action of the elastic restoring force, and at the same time, the elastic clamping part 25 limits the outer side of the driving part 19; at the same time, there are several elastic clamping parts 25, elastic clamping strips 24 and driving parts 19, so through these multiple groups of elastic clamping strips 24, elastic clamping parts 25 and driving parts 19, the outer shell 4 can be prevented from separating from the driving disk 14 (but the outer shell 4 has a certain mobility when not adsorbed).

[0052] Then, when in use, after the bonding piece 1 is bonded to the plane to be bonded, the user squeezes the operating disk 28 with one hand and rotates the outer shell 4 with the other hand, and rotates the driving part 19 toward the engaging groove 22; in this rotation direction, since the depth of the driving groove 21 gradually decreases, and at the same time, the side of the outer shell 4 close to the bonding piece 1 abuts against the pressing ring 3, and the pressing ring 3 abuts against the periphery of the bonding piece 1, the outer shell 4 will not move toward the plane to be bonded (or move a very small distance, such as the distance for the bonding piece 1 to undergo elastic deformation, but this distance can be ignored), and the solid driving part 19 drives the driving disk 14 outward to move; at the same time, the driving disk 14 drives the connecting piece 6 and the middle part of the bonding piece 1 outward through the traction column 2, so that a negative pressure space can be generated between the bonding piece 1 and the plane to be bonded, so that the bonding piece 1 can be tightly bonded to the plane to be bonded.

[0053] The cross-section of the driving portion 19 on one side of the driving groove 21 is arc-shaped, and the cross-section of the engaging groove 22 is also arc-shaped. In this way, when the driving portion 19 is engaged in the engaging groove 22, both sides of the end of the driving portion 19 can be limited by the inner wall of the engaging groove 22, so that the stability of the position of the driving portion 19 can be ensured; and when the outer shell 4 is rotated, when the driving portion 19 contacts the end portion 23, it indicates that the outer shell 4 has been rotated to the maximum angle, making it easier to judge whether the suction cup has completed the operation.

[0054] When rotating the outer shell 4, the worker holds the operating disk 28, so that the traction column 2 does not rotate. At the same time, the connecting tube 7, the connecting member 6 and the fitting member 1 threadedly connected to the threaded column 8 do not rotate at an angle. In addition, under the action of the anti-rotation protrusion 17 and the anti-rotation groove 18, the driving disk 14 and the extension tube 15 do not rotate. In this way, the relative rotation between the outer shell 4 and the driving disk 14 can be stably achieved, that is, the outer shell 4 can stably drive the middle part of the fitting member 1 outward to move.

[0055] At the same time, the inner wall of the pre-opening in the middle of the outer shell 4 is limited by the outer wall of the traction column 2, so that the outer shell 4 can only rotate; at the same time, the inner sides of several driving parts 19 are movably in contact with the outer wall of the concentric cylinder 29, so that the position stability of the pressing ring 3 is guaranteed, and the pressing ring 3 is stably kept concentric with the fitting 1.

[0056] The edge of the adhesive member 1 is provided with a sealing portion 5 (relatively thin, shown in the figure for illustration only). This allows the adhesive member 1 to maintain a good contact with the surface even if a small amount of air is trapped between the adhesive member 1 and the surface being applied, preventing air from entering the space between the adhesive member 1 and the surface being applied. To unlock the suction cup, the worker simply pulls outward on the air intake control portion 30 on the edge of the adhesive member 1, making this operation simple and convenient.

[0057] If the suction cup has structural damage and needs to be replaced or repaired, first insert a conventional tool such as a screwdriver through the unlocking hole 27 and push the elastic clamping portion 25 toward the middle. This will allow the outer shell 4 to be directly separated from the drive disk 14 outward, and finally rotate the traction column 2 to separate it from the connecting tube 7.

[0058] The above description is only a description of the preferred embodiment of the present invention and does not limit the scope of the present invention. Any changes and modifications made by ordinary technicians in the field of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. A rotary suction cup, characterized in that: include: A fitting member (1), wherein the fitting member (1) is made of a flexible material, and the two sides of the fitting member (1) are a fitting side and a back side respectively; A traction column (2), the traction column (2) being connected to the middle portion of the back side of the fitting (1); An annular pressing ring (3) is attached to the back side of the fitting member (1), and the traction column (2) moves through the center of the pressing ring (3); An outer shell (4) is in contact with a side of the pressing ring (3) facing away from the fitting member (1), and a driving mechanism for driving the traction column (2) to move is provided on the outer shell (4).

2. A rotary suction cup according to claim 1, characterized in that: An annular sealing portion (5) is provided on the periphery of the bonding side of the bonding piece (1).

3. A rotary suction cup according to claim 1 or 2, characterized in that: The invention also includes a connecting piece (6), one side of which is fixedly connected to the middle part of the fitting piece (1), and the other side of which is provided with a cylindrical connecting tube (7), and the end of the traction column (2) is provided with a threaded column (8) threadedly connected to the inner wall of the connecting tube (7).

4. A rotary suction cup according to claim 3, characterized in that: An annular connecting ring (9) is provided in the middle of the back side of the fitting (1), and an anti-slip ring (10) is provided on the inner side of the free end of the connecting ring (9). The outer wall of the connecting member (6) is respectively fitted to the middle of the back side, the inner wall of the connecting ring (9) and the inner side of the anti-slip ring (10), and the outer wall of the connecting ring (9) is separated from the pressing ring (3).

5. The rotary suction cup according to claim 4, characterized in that: A plurality of anti-rotation holes (11) are provided through the connecting member (6), and an anti-rotation portion (12) matching the anti-rotation holes (11) is provided on the back side of the fitting member (1), and the free end of the anti-rotation portion (12) is connected to the anti-slip ring (10).

6. The rotary suction cup according to claim 4, characterized in that: The outer wall of the connecting tube (7) is provided with a matching ring (13), and the outer wall of the matching ring (13) is fitted to the anti-slip ring (10).

7. The rotary suction cup according to claim 3, characterized in that: The driving mechanism comprises a driving disc (14), an extension tube (15) is provided in the middle of the driving disc (14), a clearance hole (16) is provided through the extension tube (15) and the middle of the driving disc (14), an anti-rotation protrusion (17) is provided on the inner wall of the clearance hole (16), an anti-rotation groove (18) matched with the anti-rotation protrusion (17) is provided at the end of the connecting tube (7), and the end of the traction column (2) contacts the end of the extension tube (15) away from the fitting member (1); The inner wall of the outer shell (4) is provided with a driving portion (19), the edge of the driving disk (14) is provided with a through opening (20) for the driving portion (19) to pass through, and the driving disk (14) is provided with a driving groove (21) and a snap-fit ​​groove (22) on one side close to the fitting (1), one end of the driving groove (21) is communicated with the through opening (20), and the other end is communicated with the snap-fit ​​groove (22), and the depth of the driving groove (21) increases with the contact with the fitting (1). The distance of the corresponding through opening (20) increases and decreases. When the driving portion (19) acts on the inner wall of the driving groove (21), the driving disc (14), the traction column (2), the connecting member (6) and the middle part of the fitting member (1) all move outward. When the driving portion (19) is engaged with the engaging groove (22), both sides of the driving portion (19) away from one end of the fitting member (1) are engaged with the inner wall of the engaging groove (22).

8. The rotary suction cup according to claim 7, characterized in that: The edge of the driving disk (14) is further provided with a terminating portion (23). When the driving portion (19) is engaged with the engaging groove (22), the side of the driving portion (19) contacts the terminating portion (23).

9. The rotary suction cup according to claim 7, characterized in that: An elastic clip (24) is provided in the through opening (20), the free end of the elastic clip (24) faces away from the fitting (1), and an elastic clip portion (25) is provided on the outer side of the free end of the elastic clip (24), and the outer side of the elastic clip portion (25) away from one end of the fitting (1) is an inclined driving slope (26). When the outer shell (4) moves toward the fitting (1), the driving portion (19) can act on the driving slope (26) and drive the elastic clip (24) to elastically deform toward the middle of the outer shell (4). When the outer shell (4) contacts the pressing ring (3), the side of the elastic clip portion (25) close to the fitting (1) is used to limit the driving portion (19).

10. The rotary suction cup according to claim 9, characterized in that: A plurality of unlocking holes (27) are provided through the outer shell (4), and each of the unlocking holes (27) is directly opposite to one of the elastic clamping parts (25). An operating disk (28) having a diameter larger than that of the traction column (2) is provided at one end of the traction column (2) away from the fitting (1). A cylindrical concentric cylinder (29) is provided at the middle of the pressing ring (3) away from the fitting (1). All the driving parts (19) are movably fitted to the outer wall of the concentric cylinder (29), and an air intake operating part (30) is provided at the edge of the fitting (1).

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