CN112893558A

CN112893558A - Novel automatic pipe bending device

Info

Publication number: CN112893558A
Application number: CN202110062497.XA
Authority: CN
Inventors: 代毅波
Original assignee: Individual
Current assignee: Tianjin Paipulan Energy Technology Co ltd
Priority date: 2021-01-18
Filing date: 2021-01-18
Publication date: 2021-06-04
Anticipated expiration: 2041-01-18
Also published as: CN112893558B

Abstract

The invention discloses a novel automatic pipe bending device which comprises a power device, wherein a support is arranged at the bottom of the power device, an upper support frame is arranged in the center of the top of the support, the top of the upper support frame is movably connected with the bottom of the power device, support legs are uniformly arranged at the bottom of the support, the tops of the support legs are movably connected with the bottom of the support, a hydraulic column is arranged inside the upper support frame, the top of the hydraulic column is fixedly connected with the inside of the upper support frame, a connecting block is arranged at the bottom of the hydraulic column, the top of the connecting block is movably connected with the bottom of the hydraulic column, a positioning block is arranged at the bottom of the connecting block, and the top of the positioning block is fixedly connected with the. This novel automatic swan neck system has solved traditional swan neck system and probably has become flat serious with pipeline circular arc department, presents the ellipse, and in the course of working, the problem that the phenomenon that the circular arc inboard may corrugate and crooked resilience appears.

Description

Novel automatic pipe bending device

Technical Field

The invention relates to the technical field of machining, in particular to a novel automatic pipe bending device.

Background

As is known, pipelines are widely used in many industries, and are inevitably used in automobiles, ships, airplanes, equipment and the like, and the pipelines are used for conveying water, cooling liquid, fuel oil, hydraulic oil and the like. Taking the automobile field as an example, the types of pipelines mainly include two types, namely a rubber pipe and a metal pipe, due to the limitation of space, the pipelines often need complex space angles and accurate positioning and installation, for the rubber pipe, a required space angle can be formed in the rubber pipe forming process, and for the metal pipe, a bending device is needed to bend the straight pipe to form the required bending angle. Among the prior art, to automatic swan neck system, swan neck system probably becomes flat serious with pipeline circular arc department, presents the ellipse, and in the course of working, the circular arc inboard can corrugate and the phenomenon of crooked resilience appears, provides a novel automatic swan neck system now.

Disclosure of Invention

The invention aims to provide a novel automatic pipe bending device to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: a novel automatic pipe bending device comprises a power device, wherein a support is arranged at the bottom of the power device, an upper support frame is arranged in the center of the top of the support, the top of the upper support frame is movably connected with the bottom of the power device, support legs are uniformly arranged at the bottom of the support, the tops of the support legs are movably connected with the bottom of the support, a hydraulic column is arranged inside the upper support frame, the top of the hydraulic column is fixedly connected with the inside of the upper support frame, a connecting block is arranged at the bottom of the hydraulic column, the top of the connecting block is movably connected with the bottom of the hydraulic column, a positioning block is arranged at the bottom of the connecting block, the top of the positioning block is fixedly connected with the bottom of the connecting block, a pipe bending mechanism is arranged at the bottom of the positioning block, the top of the pipe bending mechanism is fixedly connected with the bottom, and the left end of the matching mechanism is provided with a positioning device, the right end of the positioning device is fixedly connected with the left end of the matching mechanism, two ends of the top of the matching mechanism are provided with contact blocks, the number of the contact blocks is two, the bottom of the matching mechanism is provided with a lower support frame, the two ends of the lower support frame are fixedly connected with the two ends of the support frame, a support ring is arranged right above the matching mechanism, the inside of the support ring is uniformly provided with connecting balls, the outer surface of the connecting balls is symmetrically provided with telescopic rings, the outer surface of each telescopic ring is sleeved with a compression spring, two ends of the compression spring are fixedly connected with the outer surface of the connecting ball, a magnetic ball is arranged at the axis of the supporting ring, the outer surface of the magnetic ball is uniformly provided with a connecting rod, the left end of the connecting rod is fixedly connected with the outer surface of the magnetic ball, and the right end of the connecting rod is fixedly connected with the inner ring of the support ring.

Preferably, the contact block is symmetrically provided with rollers at two ends thereof, a shaft hole is formed in the roller, the surface of the contact block is provided with a contraction mechanism, sleeves are arranged at two ends of the contraction mechanism, and the top of the contraction mechanism is fixedly connected with the bottom of the sleeve.

Preferably, shrink mechanism includes the contact plate, the bottom symmetry at contact plate both ends is provided with the extrusion piece, the bottom of extrusion piece is provided with the shrink spring, and the top of shrink spring and the bottom fixed connection of extrusion piece, the bottom of shrink spring is provided with the bottom block, and the top of bottom block and the bottom fixed connection of shrink spring, the central authorities of contact plate bottom evenly are provided with the rotation axis, and the both ends symmetry of rotation axis is provided with the folding rod, and the bottom of folding rod and the top fixed connection of bottom block.

Preferably, the pipe bending mechanism comprises a fixed block, a rotating shaft is arranged inside the fixed block, friction blocks are symmetrically arranged on two sides of the rotating shaft, an ejector rod is arranged at the right end of each friction block, the left end of the ejector rod is fixedly connected with the right end of each friction block, a fixed column is arranged at the right end of the ejector rod, the left end of each fixed column is fixedly connected with the right end of the ejector rod, a connecting spring is arranged at the right end of each fixed column, the left end of each connecting spring is fixedly connected with the right end of each fixed column, the right end of each connecting spring is fixedly connected with the inner wall of the fixed block, a blocking ball is uniformly arranged at the top of the fixed block, a pipe bending block is arranged at the bottom of the rotating shaft, a contact surface is arranged at the top of each pipe bending.

Preferably, the wrinkle removing mechanism comprises a limiting block, a rotating ball is arranged inside the limiting block, a connecting column is arranged on the outer surface of the rotating ball, a wrinkle removing block is arranged at the top of the connecting column, and the bottom of the wrinkle removing block is fixedly connected with the top of the connecting column.

Preferably, the cooperation mechanism includes the cooperation piece, the mounting hole has been seted up at the both ends of cooperation piece, and flexible groove has been seted up to the inside of cooperation piece, the inside in flexible groove is provided with the telescopic link, the top of telescopic link is provided with the contact ring, and the bottom of contact ring and the top fixed connection of telescopic link.

The invention provides a novel automatic pipe bending device. The method has the following beneficial effects:

(1) according to the novel automatic pipe bending device, the problem that the circular arc position of the pipeline is seriously flattened and appears as an ellipse by the traditional pipe bending device can be effectively solved, when the novel automatic pipe bending device is used for processing the pipeline, the magnetic ball can be firstly placed at the position to be bent, when the bent position of the pipeline is gradually extruded and changed into the ellipse, the gradually deformed bent position can be gradually restored to the circular shape through the connecting ball and the compression spring which are arranged on the outer surface of the magnetic ball, after the novel automatic pipe bending device finishes working, the compression spring restores the connecting ball to the original position, the magnetic ball can be taken out through the magnetic force of the magnetic ball, the pipe bending effect of the novel automatic pipe bending device is greatly improved, and the bent position of the pipeline is prevented from appearing as the ellipse when the pipeline is.

(2) According to the invention, through the arranged wrinkle removing mechanism, the problem that the inner side of the circular arc wrinkles when the traditional pipe bending device bends the pipe can be solved, when the pipe enters the inner cavity, the hydraulic column moves downwards to drive the pipe bending block to move downwards, when the contact surface is in contact with the matching mechanism, the rotating shaft moves left and right, the rotating shaft can be decelerated by the friction block arranged left and right, the wrinkles on the inner side of the circular arc can be removed through the wrinkle removing mechanism, and the pipe bending effect of the novel automatic pipe bending device is greatly improved.

(3) The invention can avoid the phenomenon of bending springback when the pipeline is bent through the arranged contact ring, when the pipe bending block moves downwards, the pipe bending block continues to move downwards after the contact surface is tightly connected with the contact ring, the telescopic rod moves downwards after being extruded by the contact ring, the pipeline placed inside the pipe bending block can avoid the phenomenon of bending springback through long-time bending, when the pipeline is bent, the wrinkle removing mechanism arranged inside the pipe bending block is matched with the matching mechanism, the wrinkle which is generated on the inner side of the circular arc when the pipeline is bent can be removed through the wrinkle removing block arranged on the wrinkle removing mechanism, the wrinkle removing block is contacted with the outer surface of the pipeline, the surface of the pipeline applies an extrusion force to the wrinkle removing block, the wrinkle removing block shakes left and right, and the wrinkle which is generated on the inner side of the circular arc can be removed.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a front view of the present invention;

FIG. 3 is a schematic view of a magnetic ball according to the present invention;

FIG. 4 is a schematic view of a contact block structure according to the present invention;

FIG. 5 is a schematic view of the retracting mechanism of the present invention;

FIG. 6 is a schematic structural diagram of a pipe bending mechanism according to the present invention;

FIG. 7 is a schematic structural diagram of a wrinkle removing mechanism according to the present invention;

FIG. 8 is a schematic view of the structure of the engagement mechanism of the present invention.

In the figure: 1. a power plant; 2. an upper support frame; 3. a support; 4. a hydraulic column; 5. a contact block; 6. a mating mechanism; 7. a lower support frame; 8. a support leg; 9. a pipe bending mechanism; 10. positioning blocks; 11. connecting blocks; 12. a positioning device; 13. a connecting ball; 14. a compression spring; 15. a connecting rod; 16. a telescopic ring; 17. a support ring; 18. a magnetic ball; 51. a shaft hole; 52. a roller; 53. a sleeve; 54. a retracting mechanism; 61. mounting holes; 62. a contact ring; 63. a telescopic rod; 64. a telescopic groove; 65. a matching block; 91. a connecting spring; 92. a fixed block; 93. a rotating shaft; 94. a top rod; 95. a blocking ball; 96. fixing a column; 97. a friction block; 98. an inner cavity; 99. a wrinkle removing mechanism; 910. a pipe bending block; 911. a contact surface; 541. a contact plate; 542. extruding the block; 543. a rotating shaft; 544. folding the rod; 545. a retraction spring; 546. a bottom block; 991. a limiting block; 992. rotating the ball; 993. connecting columns; 994. removing wrinkle blocks.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 to 8, the present invention provides a technical solution: a novel automatic pipe bending device comprises a power device 1, wherein the power device 1 is arranged to control up-and-down movement of a hydraulic column 4, a support 3 is arranged at the bottom of the power device 1, the support 3 plays a certain stabilizing role, the support 3 can be used for placing the power device 1, an upper support frame 2 is arranged in the center of the top of the support 3, the upper support frame 2 is arranged to install the hydraulic column 4, the hydraulic column 4 can be stably used in the using process, the top of the upper support frame 2 is movably connected with the bottom of the power device 1, support legs 8 are uniformly arranged at the bottom of the support 3, the support legs 8 are arranged to play a stabilizing role when the novel automatic pipe bending device is used, the top of the support legs 8 are movably connected with the bottom of the support 3, the hydraulic column 4 is arranged inside the upper support frame 2, and the top of the hydraulic column 4 is fixedly connected with the inside of the upper support frame 2, the bottom of hydraulic pressure post 4 is provided with connecting block 11, and the top of connecting block 11 and the bottom swing joint of hydraulic pressure post 4, and the bottom of connecting block 11 is provided with locating piece 10, and the bottom fixed connection of the top of locating piece 10 and connecting block 11, and the bottom of locating piece 10 is provided with return bend mechanism 9. The top of the pipe bending mechanism 9 is fixedly connected with the bottom of the positioning block 10, a matching mechanism 6 is arranged right below the pipe bending mechanism 9, the left end of the matching mechanism 6 is provided with a positioning device 12, the positioning device 12 is arranged for controlling the extending length of the pipeline and controlling the bending position of the pipeline, the right end of the positioning device 12 is fixedly connected with the left end of the matching mechanism 6, the matching mechanism 6 is arranged for placing the pipe bending block 910 in the matching mechanism 6 so that the pipeline can be bent after being matched with the pipe bending block 910 and the contact block 5, two ends of the top of the matching mechanism 6 are provided with the contact blocks 5, the number of the contact blocks 5 is two, the bottom of the matching mechanism 6 is provided with a lower support frame 7, two ends of the lower support frame 7 are fixedly connected with two ends of the support frame 3, a support ring 17 is arranged right above the matching mechanism 6, and connecting balls 13 are uniformly arranged in the support ring 17, the purpose of connecting ball 13 is in order to control the length of telescopic ring 16 after telescopic ring 16 stretches out and draws back, the surface symmetry of connecting ball 13 is provided with telescopic ring 16, compression spring 14 has been cup jointed to telescopic ring 16's surface, and compression spring 14's both ends and the outer fixed surface who connects ball 13 are connected, the axle center department of support ring 17 is provided with magnetic ball 18, magnetic ball 18's surface evenly is provided with connecting rod 15, the left end of connecting rod 15 and the outer fixed surface of magnetic ball 18 are connected, the right-hand member of connecting rod 15 and the inner ring fixed connection of support ring 17, the purpose of setting up connecting rod 15 is in order to control the contact of magnetic ball 18 and connecting ball 13.

Contact 5's both ends symmetry is provided with gyro wheel 52, and shaft hole 51 has been seted up to the inside of gyro wheel 52, and contact 5's surface is provided with shrink mechanism 54, and shrink mechanism 54's both ends are provided with sleeve 53, and shrink mechanism 54's top and sleeve 53's bottom fixed connection set up shrink mechanism 54's purpose is in order to avoid producing the mark after the friction after pipeline and contact 5 contact for the pipeline is buckled and is not conform to the regulation.

The contracting mechanism 54 comprises a contact plate 541, the bottom of two ends of the contact plate 541 is symmetrically provided with an extrusion block 542, the bottom of the extrusion block 542 is provided with a contracting spring 545, the top end of the contracting spring 545 is fixedly connected with the bottom of the extrusion block 542, the bottom end of the contracting spring 545 is provided with a bottom block 546, the top of the bottom block 546 is fixedly connected with the bottom end of the contracting spring 545, the center of the bottom of the contact plate 541 is uniformly provided with a rotating shaft 543, two ends of the rotating shaft 543 are symmetrically provided with folding rods 544, the bottom of the folding rods 544 is fixedly connected with the top of the bottom block 546, by arranging the magnetic ball 18, the problem that the arc position of a pipeline is seriously flattened by the traditional pipe bending device can be effectively solved, the problem of an oval shape is solved, when the novel automatic pipe bending device is used for processing the pipeline, the magnetic ball 18 can be placed at the position needing to be bent first, when the bending position of the pipeline is gradually extruded to be Resume circularly, after this novel automatic swan neck system finishes work, compression spring 14 will connect ball 13 and resume original position, can take out magnetic ball 18 through the magnetic force that magnetic ball 18 took, has improved this novel automatic swan neck system's return bend effect greatly, avoids the pipeline to bend when bending and locates to present the ellipse.

The pipe bending mechanism 9 comprises a fixed block 92, a rotating shaft 93 is arranged inside the fixed block 92, friction blocks 97 are symmetrically arranged on two sides of the rotating shaft 93, an ejector rod 94 is arranged at the right end of the friction block 97, the left end of the ejector rod 94 is fixedly connected with the right end of the friction block 97, a fixed column 96 is arranged at the right end of the ejector rod 94, the left end of the fixed column 96 is fixedly connected with the right end of the ejector rod 94, a connecting spring 91 is arranged at the right end of the fixed column 96, the left end of the connecting spring 91 is fixedly connected with the right end of the fixed column 96, the right end of the connecting spring 91 is fixedly connected with the inner wall of the fixed block 92, blocking balls 95 are uniformly arranged at the top of the fixed block 92, a pipe bending block 910 is arranged at the bottom of the rotating shaft 93, a contact surface 911 is arranged at the top of the pipe bending block 910, an inner cavity 98 is arranged inside the pipe, when the bent pipe block 910 moves downwards, after the contact surface 911 is in close contact with the contact ring 62, the bent pipe block 910 continues to move downwards, the telescopic rod 63 is extruded by the contact ring 62 and then moves downwards, the pipeline placed inside the bent pipe block 910 can be bent for a long time to avoid the phenomenon of bending resilience, the pipeline is matched with the wrinkle removing mechanism 99 arranged inside the bent pipe block 910 through the matching mechanism 6, the pipeline can be bent, wrinkles on the inner side of an arc of the pipeline can be removed through the wrinkle removing block 994 arranged on the wrinkle removing mechanism 99, the wrinkle removing block 994 is in contact with the outer surface of the pipeline, the surface of the pipeline applies an extrusion force to the wrinkle removing block 994, the wrinkle removing block 994 shakes left and right, and wrinkles on the inner side of the arc can be removed.

Wrinkle removal mechanism 99 is including limiting block 991, limiting block 991's inside is provided with swivel ball 992, swivel ball 992's surface is provided with spliced pole 993, spliced pole 993's top is provided with wrinkle removal piece 994, and wrinkle removal piece 994's bottom and spliced pole 993's top fixed connection, wrinkle removal mechanism 99 through setting up, can solve traditional swan neck system when bending the pipeline, make the inboard condition of wrinkling of circular arc appear, when the pipeline enters into inner chamber 98, hydraulic pressure post 4 downstream, drive pipeline downstream with pipe bending piece 910, when contact surface 911 and cooperation mechanism 6 contact, pivot 93 side-to-side motion, the friction block 97 of controlling the setting can slow down pivot 93 motion, can get rid of the inboard wrinkling of circular arc through wrinkle removal mechanism 99, the return bend effect of this novel automatic swan neck system has been improved greatly.

The cooperation mechanism 6 includes cooperation piece 65, and mounting hole 61 has been seted up at the both ends of cooperation piece 65, and flexible groove 64 has been seted up to the inside of cooperation piece 65, and the inside in flexible groove 64 is provided with telescopic link 63, and the top of telescopic link 63 is provided with contact ring 62, and contact ring 62's bottom and telescopic link 63's top fixed connection, and the purpose that sets up cooperation mechanism 6 can control the descending depth of bent pipe piece 910 after in order to control bent pipe piece 910 and contact ring 62 contact.

The working principle is as follows: when the novel automatic pipe bending device is used, a pipeline is placed in the inner cavity 98, the hydraulic column 4 moves downwards through the power device 1, after the pipe bending block 910 receives extrusion force from the hydraulic column 4, after the pipe bending block 910 receives reaction force from the pipeline, the rotating shaft 93 swings left and right, the rotating shaft 93 receives friction force of the friction block 97, the swinging of the rotating shaft 93 is slow, the wrinkle removing mechanism 99 arranged inside the pipe bending block 910 is enabled to enable the wrinkle removing block 994 arranged on the wrinkle removing mechanism 99 to be in close contact with a bending part on the inner side of the pipeline, after the pipeline applies force to the wrinkle removing block 994, the wrinkle removing block 994 swings left and right through the rotating ball 992, wrinkles on the inner side of an arc can be removed after the wrinkle removing block 994 is in contact with the bending part on the inner side of the pipeline, after the pipeline is placed on the contact block 5, the contact plate 541 can be extruded downwards, the contact plate 541 can move downwards through the extrusion block 542 arranged below, the scratch on the upper surface of the pipeline can be relieved.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a novel automatic swan neck system, includes power device (1), its characterized in that: the bottom of the power device (1) is provided with a support (3), the center of the top of the support (3) is provided with an upper support frame (2), the top of the upper support frame (2) is movably connected with the bottom of the power device (1), the bottom of the support (3) is uniformly provided with support legs (8), the top of the support legs (8) is movably connected with the bottom of the support (3), a hydraulic column (4) is arranged inside the upper support frame (2), the top of the hydraulic column (4) is fixedly connected with the inside of the upper support frame (2), the bottom of the hydraulic column (4) is provided with a connecting block (11), the top of the connecting block (11) is movably connected with the bottom of the hydraulic column (4), the bottom of the connecting block (11) is provided with a positioning block (10), the top of the positioning block (10) is fixedly connected with the bottom of the connecting block (11), the bottom of the positioning block (10) is provided with a pipe, and the top of the pipe bending mechanism (9) is fixedly connected with the bottom of the positioning block (10), a matching mechanism (6) is arranged under the pipe bending mechanism (9), a positioning device (12) is arranged at the left end of the matching mechanism (6), the right end of the positioning device (12) is fixedly connected with the left end of the matching mechanism (6), contact blocks (5) are arranged at the two ends of the top of the matching mechanism (6), the number of the contact blocks (5) is two, a lower support frame (7) is arranged at the bottom of the matching mechanism (6), the two ends of the lower support frame (7) are fixedly connected with the two ends of the support frame (3), a support ring (17) is arranged right above the matching mechanism (6), connecting balls (13) are uniformly arranged in the support ring (17), telescopic rings (16) are symmetrically arranged on the outer surfaces of the connecting balls (13), and compression springs (14) are sleeved on the outer surfaces of the telescopic rings (16), and the both ends of compression spring (14) and the outer fixed surface who is connected ball (13) are connected, the axle center department of support ring (17) is provided with magnetic ball (18), the surface of magnetic ball (18) evenly is provided with connecting rod (15), the left end of connecting rod (15) and the outer fixed surface of magnetic ball (18) are connected, the right-hand member of connecting rod (15) and the inner ring fixed connection of support ring (17).

2. The novel automatic pipe bending device according to claim 1, characterized in that: contact block (5) both ends symmetry are provided with gyro wheel (52), shaft hole (51) have been seted up to the inside of gyro wheel (52), contact block (5) surface is provided with shrink mechanism (54), shrink mechanism's (54) both ends are provided with sleeve (53), and the top of shrink mechanism (54) and the bottom fixed connection of sleeve (53).

3. The novel automatic pipe bending device according to claim 1, characterized in that: shrink mechanism (54) are including contact plate (541), the bottom symmetry at contact plate (541) both ends is provided with extrusion piece (542), the bottom of extrusion piece (542) is provided with shrink spring (545), and the top of shrink spring (545) and the bottom fixed connection of extrusion piece (542), the bottom of shrink spring (545) is provided with bottom block (546), and the top of bottom block (546) and the bottom fixed connection of shrink spring (545), the central authorities of contact plate (541) bottom evenly are provided with rotation axis (543), and the both ends symmetry of rotation axis (543) is provided with folding rod (544), and the bottom of folding rod (544) and the top fixed connection of bottom block (546).

4. The novel automatic pipe bending device according to claim 1, characterized in that: the pipe bending mechanism (9) comprises a fixed block (92), a rotating shaft (93) is arranged inside the fixed block (92), friction blocks (97) are symmetrically arranged on two sides of the rotating shaft (93), an ejector rod (94) is arranged at the right end of each friction block (97), the left end of each ejector rod (94) is fixedly connected with the right end of each friction block (97), a fixed column (96) is arranged at the right end of each ejector rod (94), the left end of each fixed column (96) is fixedly connected with the right end of each ejector rod (94), a connecting spring (91) is arranged at the right end of each fixed column (96), the left end of each connecting spring (91) is fixedly connected with the right end of each fixed column (96), the right end of each connecting spring (91) is fixedly connected with the inner wall of the fixed block (92), blocking balls (95) are uniformly arranged at the top of the fixed block (92), and a pipe bending block (910) is, the top of the bent pipe block (910) is provided with a contact surface (911), an inner cavity (98) is formed in the bent pipe block (910), and two ends of the inner cavity (98) are provided with wrinkle removing mechanisms (99).

5. The novel automatic pipe bending device according to claim 1, characterized in that: remove wrinkle mechanism (99) including restriction piece (991), the inside of restriction piece (991) is provided with spin ball (992), the surface of spin ball (992) is provided with spliced pole (993), the top of spliced pole (993) is provided with removes wrinkle piece (994), and removes the bottom of wrinkle piece (994) and the top fixed connection of spliced pole (993).

6. The novel automatic pipe bending device according to claim 1, characterized in that: cooperation mechanism (6) are including cooperation piece (65), mounting hole (61) have been seted up at the both ends of cooperation piece (65), and flexible groove (64) have been seted up to the inside of cooperation piece (65), the inside in flexible groove (64) is provided with telescopic link (63), the top of telescopic link (63) is provided with contact ring (62), and contacts the bottom of ring (62) and the top fixed connection of telescopic link (63).