CN112893558B

CN112893558B - Automatic pipe bending device

Info

Publication number: CN112893558B
Application number: CN202110062497.XA
Authority: CN
Inventors: 代毅波
Original assignee: Tianjin Paipulan Energy Technology Co ltd
Current assignee: Tianjin Paipulan Energy Technology Co ltd
Priority date: 2021-01-18
Filing date: 2021-01-18
Publication date: 2023-05-30
Anticipated expiration: 2041-01-18
Also published as: CN112893558A

Abstract

The invention discloses an 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 top of each support leg is movably connected with the bottom of the support, a hydraulic column is arranged in the upper support frame, the top of each hydraulic column is fixedly connected with the inside of the upper support frame, a connecting block is arranged at the bottom of each hydraulic column, the top of each connecting block is movably connected with the bottom of each hydraulic column, a positioning block is arranged at the bottom of each connecting block, and the top of each positioning block is fixedly connected with the bottom of each connecting block. The automatic pipe bending device solves the problems that the traditional pipe bending device can seriously flatten the arc of a pipeline and present an ellipse, and the inner side of the arc can be wrinkled and bent and rebounded in the processing process.

Description

Automatic pipe bending device

Technical Field

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

Background

As is well known, pipelines are widely used in many industries, and are inevitably used for 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 automotive field as an example, the types of pipelines mainly include two types of rubber pipes and metal pipe fittings, because of space limitation, the pipelines often need complex space angles and accurate positioning and installation, for rubber pipes, required space angles can be formed usually in the rubber pipe forming process, and for metal pipe fittings, bending operation is required to be performed on straight pipes by using a pipe bending device so as to form required bending angles. In the prior art, for an automatic pipe bending device, the pipe bending device may flatten a circular arc part of a pipeline seriously to present an oval shape, and during the processing process, the inner side of the circular arc may wrinkle and bend and rebound phenomenon occurs, so that the automatic pipe bending device is provided.

Disclosure of Invention

The invention aims to provide an automatic pipe bending device which solves the problems in the background technology.

In order to achieve the above purpose, the present invention provides the following technical solutions: an automatic pipe bending device comprises a power device, 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, supporting legs are uniformly arranged at the bottom of the support, the top of the supporting legs are movably connected with the bottom of the support, a hydraulic column is arranged in 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, a matching mechanism is arranged under the pipe bending mechanism, the left end of the matching mechanism is fixedly connected with the left end of the matching mechanism, the 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 bottom of the matching mechanism is provided with a connecting block, the bottom of the lower support frame is fixedly connected with the bottom of the connecting block, the bottom of the connecting block is provided with the connecting block, the two ends of the magnetic ball is fixedly connected with the outer surface of a compression ball, the compression ball is provided with the outer surface of a magnetic ball, the outer surface of the compression ball is fixedly connected with the outer surface of the compression ball, the compression ball is provided with the outer surface of the compression ball is uniformly connected with the compression ball, and the compression ball is provided with the compression ball, the right end of the connecting rod is fixedly connected with the inner ring of the supporting ring.

Preferably, the contact block is symmetrically provided with rollers at two ends, shaft holes are formed in the rollers, a contraction mechanism is arranged on the surface of the contact block, 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, the shrinkage mechanism comprises a contact plate, the bottom symmetry at contact plate both ends is provided with the extrusion piece, the bottom of extrusion piece is provided with shrinkage spring, and the top of shrinkage spring and the bottom fixed connection of extrusion piece, shrinkage spring's bottom is provided with the bottom piece, and the top of bottom piece and shrinkage spring's bottom fixed connection, 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 book pole, and the bottom of book pole and the top fixed connection of bottom piece.

Preferably, the pipe bending mechanism comprises a fixed block, a rotating shaft is arranged in the fixed block, friction blocks are symmetrically arranged on two sides of the rotating shaft, a push rod is arranged at the right end of the friction block, the left end of the push rod is fixedly connected with the right end of the friction block, a fixed column is arranged at the right end of the push rod, the left end of the fixed column is fixedly connected with the right end of the push rod, a connecting spring is arranged at the right end of the fixed column, the left end of the connecting spring is fixedly connected with the right end of the fixed column, the right end of the 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 the pipe bending block, an inner cavity is formed in the inner cavity, and a wrinkle removing mechanism is arranged at the two ends of the inner cavity.

Preferably, the wrinkle removing mechanism comprises a limiting block, a rotary ball is arranged in the limiting block, a connecting column is arranged on the outer surface of the rotary 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 matching mechanism comprises a matching block, mounting holes are formed in two ends of the matching block, a telescopic groove is formed in the matching block, a telescopic rod is arranged in the telescopic groove, a contact ring is arranged at the top of the telescopic rod, and the bottom of the contact ring is fixedly connected with the top of the telescopic rod.

The invention provides an automatic pipe bending device. The beneficial effects are as follows:

(1) The invention can effectively solve the problem that the arc part of the pipeline is seriously flattened and elliptical by the traditional pipe bending device by arranging the magnetic ball, when the automatic pipe bending device is used for processing the pipeline, the magnetic ball can be firstly placed at the part needing bending, when the bending part of the pipeline is gradually extruded to be elliptical, the bending part which is gradually deformed can be gradually restored to be circular by the connecting ball and the compression spring arranged on the outer surface of the magnetic ball, and after the automatic pipe bending device finishes working, the connecting ball is restored to the original position by the compression spring, the magnetic ball can be taken out by the magnetic force carried by the magnetic ball, so that the pipe bending effect of the automatic pipe bending device is greatly improved, and the bending part of the pipeline is prevented from being elliptical when the pipeline is bent.

(2) According to the automatic pipe bending device, the provided wrinkle removing mechanism can solve the problem that the inner side of an arc is wrinkled when a traditional pipe bending device bends a pipe, when the pipe enters an inner cavity, a hydraulic column moves downwards to drive a pipe to move downwards, when a contact surface is contacted with a matching mechanism, a rotating shaft moves left and right, a friction block arranged left and right can reduce the movement of the rotating shaft, and the wrinkle on the inner side of the arc can be removed through the wrinkle removing mechanism, so that the pipe bending effect of the automatic pipe bending device is greatly improved.

(3) According to the invention, the phenomenon of bending rebound can be avoided when the pipeline is bent through the contact ring, when the bent pipe block moves downwards, the bent pipe block continues to move downwards after the contact surface is in close contact with the contact ring, the telescopic rod moves downwards after being extruded by the contact ring, the pipeline placed in the bent pipe block can be bent for a long time to avoid the phenomenon of bending rebound, and when the pipeline is bent, the pipeline can be matched with the wrinkle removing mechanism arranged in the bent pipe block for use, the wrinkle appearing on the inner side of an arc of the pipeline can be removed through the wrinkle removing block arranged on the wrinkle removing mechanism when the pipeline is bent, the wrinkle removing block is in contact with the outer surface of the pipeline, the extrusion force is applied to the wrinkle removing block by the surface of the pipeline, and the wrinkle removing block shakes left and right, so that the wrinkle appearing on the inner side of the arc can be removed.

Drawings

FIG. 1 is a schematic diagram of the structure 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 view of a pipe bending mechanism according to the present invention;

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

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

In the figure: 1. a power device; 2. an upper support frame; 3. a bracket; 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. a positioning block; 11. a connecting block; 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 retraction mechanism; 61. a mounting hole; 62. a contact ring; 63. a telescopic rod; 64. a telescopic slot; 65. a mating block; 91. a connecting spring; 92. a fixed block; 93. a rotating shaft; 94. a push rod; 95. a blocking ball; 96. fixing the column; 97. a friction block; 98. an inner cavity; 99. a wrinkle removing mechanism; 910. a bent pipe block; 911. a contact surface; 541. a contact plate; 542. extruding a block; 543. a rotation shaft; 544. folding the rod; 545. a retraction spring; 546. a bottom block; 991. a limiting block; 992. a spin ball; 993. a connecting column; 994. removing wrinkles.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

As shown in fig. 1-8, the present invention provides a technical solution: the utility model provides an automatic pipe bending device, including power device 1, set up the purpose of power device 1 in order to control the up-and-down motion of hydraulic ram 4, the bottom of power device 1 is provided with support 3, the effect of support 3 is the effect of playing certain firm effect, support 3 can be used for placing power device 1, the central authorities at support 3 top are provided with upper bracket 2, set up the purpose of upper bracket 2 in order to install hydraulic ram 4, can use hydraulic ram 4 in the use steadily, and the top of upper bracket 2 and the bottom swing joint of power device 1, the bottom of support 3 evenly is provided with stabilizer blade 8, the purpose of setting stabilizer blade 8 is in order to play firm effect when making this automatic pipe bending device use, and the top of stabilizer blade 8 and the bottom swing joint of support 3, the inside of upper bracket 2 is provided with hydraulic ram 4, and the inside fixed connection of hydraulic ram 4, the bottom of hydraulic ram 4 is provided with connecting block 11, and the bottom swing joint of connecting block 11's top and hydraulic ram 4, the bottom of locating piece 11 is provided with locating piece 10, and the bottom of 10 and the bottom fixed connection of connecting block 11 is provided with connecting block 9. And the top of return bend mechanism 9 and the bottom fixed connection of locating piece 10, be provided with cooperation mechanism 6 under return bend mechanism 9, and the left end of cooperation mechanism 6 is provided with positioner 12, the purpose that sets up positioner 12 is in order to control the extension length of pipeline, can control the department of buckling of pipeline, the right-hand member of positioner 12 and the left end fixed connection of cooperation mechanism 6, the purpose that sets up cooperation mechanism 6 is in order to return bend piece 910 can place in cooperation mechanism 6, make the pipeline can form the buckling through return bend piece 910 and contact piece 5 cooperation back, the both ends at cooperation mechanism 6 top are provided with contact piece 5, and the quantity of contact piece 5 is two, the bottom of cooperation mechanism 6 is provided with down support frame 7, and the both ends fixed connection of support frame 3 of down support frame 7, the purpose that is provided with supporting ring 17 directly over cooperation mechanism 6, the inside of supporting ring 17 evenly is provided with connecting ball 13, the purpose that is in order to control the length of the flexible ring 16 after the flexible ring 16 of connecting ball 13, the outward appearance symmetry of connecting ball 13 is provided with flexible ring 16, the surface 14 of connecting ball 16 can be compressed ring 15, the outer surface 15 of connecting rod 15 is fixed connection 15 is provided with the connecting rod 15 for the compression ring 15, the outer surface of the connecting rod 15 of the compression ring is fixed connection 15, the outer surface of the connecting rod 15 is fixed connection 15 of the connecting rod 15 with the end of the compression ring 15 of the end of the compression spring, the connecting rod is fixed connection 15.

The contact block 5 is provided with the gyro wheel 52 in both ends symmetry, and shaft hole 51 has been seted up to the inside of gyro wheel 52, and the surface of contact block 5 is provided with shrinkage mechanism 54, and shrinkage mechanism 54's both ends are provided with sleeve 53, and shrinkage mechanism 54's top and sleeve 53's bottom fixed connection set up shrinkage mechanism 54's purpose in order to avoid the pipeline to produce the trace after friction after contact with contact block 5 for the pipeline is out of specification after buckling.

The shrink mechanism 54 includes the 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 piece 546, and the top of bottom piece 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 piece 546, through setting up magnetic ball 18, can effectually solve traditional return bend device and become serious with pipeline circular arc department, present oval problem, when this automatic return bend device is in the processing pipeline, can place magnetic ball 18 in the department of needing bending earlier, when pipeline bending department extrudees gradually and becomes oval, can be recovered round gradually through the connecting ball 13 and the compression spring 14 that the bending department that the magnetic ball 18 surface set up, after this automatic return bend device finishes work, compression spring 14 resumes the original position with connecting ball 13, can take out magnetic ball 18 through magnetic force and take out magnetic ball 18 greatly, the magnetic ball 18 has been improved the magnetic ball 18 when this bending device has avoided bending greatly the bending device.

The pipe bending mechanism 9 comprises a fixed block 92, a rotating shaft 93 is arranged in the fixed block 92, friction blocks 97 are symmetrically arranged on two sides of the rotating shaft 93, a push rod 94 is arranged at the right end of the friction blocks 97, the left end of the push rod 94 is fixedly connected with the right end of the friction blocks 97, a fixed column 96 is arranged at the right end of the push rod 94, the left end of the fixed column 96 is fixedly connected with the right end of the push 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, a blocking ball 95 is 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 in the inner cavity 98, a wrinkle removing mechanism 99 is arranged at two ends of the inner cavity 98, through the contact ring 62 that sets up, can avoid the phenomenon that the bending is kick-backed to appear when pipeline is buckled, when return bend piece 910 moves down, contact surface 911 and contact ring 62 in close contact back, return bend piece 910 continues the downward movement, telescopic link 63 receives the extrusion back from contact ring 62, the downward movement, the pipeline of placing inside return bend piece 910 can avoid bending the phenomenon of kick-backing through bending for a long time, through the cooperation of cooperation mechanism 6 and the wrinkle removal mechanism 99 that the inside setting of return bend piece 910, can be when bending the pipeline, the fold that the circular arc inboard appears when bending is got rid of through the wrinkle removal piece 994 that sets up on the wrinkle removal mechanism 99, wrinkle removal piece 994 contacts with the pipeline surface, the pipeline surface is exerted a extrusion force to wrinkle removal piece 994, wrinkle removal piece 994 rocks about, the fold that the circular arc inboard appears can be got rid of.

The wrinkle removing mechanism 99 comprises a limiting block 991, a rotating ball 992 is arranged in the limiting block 991, a connecting column 993 is arranged on the outer surface of the rotating ball 992, a wrinkle removing block 994 is arranged at the top of the connecting column 993, the bottom of the wrinkle removing block 994 is fixedly connected with the top of the connecting column 993, the wrinkle removing mechanism 99 is arranged to solve the problem that the inner side of an arc is wrinkled when a pipeline is bent by the traditional pipe bending device, when the pipeline enters an inner cavity 98, the hydraulic column 4 moves downwards to drive the pipe bending block 910 to move downwards, when a contact surface 911 contacts with a matching mechanism 6, a rotating shaft 93 moves left and right, a friction block 97 arranged left and right can slow down the movement of the rotating shaft 93, the inner side of the arc can be removed by the wrinkle removing mechanism 99, and the pipe bending effect of the automatic pipe bending device is greatly improved.

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 of flexible groove 64 is provided with telescopic link 63, and telescopic link 63's top is provided with contact ring 62, and contact ring 62's bottom and telescopic link 63's top fixed connection, the purpose that sets up cooperation mechanism 6 can control return bend piece 910 decline degree of depth after in order to control return bend piece 910 and contact ring 62 contact.

Working principle: when the automatic pipe bending device is used, a pipe 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, the rotating shaft 93 shakes left and right after the pipe bending block 910 receives reaction force from the pipe, the rotating shaft 93 receives friction force of the friction block 97, so that the shaking of the rotating shaft 93 is slow, the pipe bending block 910 is internally provided with the wrinkle removing mechanism 99, after the pipe applies force to the wrinkle removing block 994 through the wrinkle removing block 994 which is arranged on the wrinkle removing mechanism 99, the wrinkle removing block 994 shakes left and right through the rotary ball 992, the wrinkle inside an arc can be removed after the wrinkle removing block 994 contacts with the bent part inside the pipe, after the pipe is placed on the contact block 5, the contact plate 541 can press the contact plate 541 downwards, the extrusion block 542 arranged below moves downwards, and scratches on the upper surface of the pipe can be relieved.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein 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. An automatic pipe bending device comprises a power device (1), and is characterized in that: the bottom of power device (1) is provided with support (3), the center at support (3) top is provided with upper bracket (2), and the top of upper bracket (2) and the bottom swing joint of power device (1), the bottom of support (3) evenly is provided with stabilizer blade (8), and the top of stabilizer blade (8) and the bottom swing joint of support (3), the inside of upper bracket (2) is provided with hydraulic ram (4), and the top of hydraulic ram (4) and the inside fixed connection of upper bracket (2), the bottom of hydraulic ram (4) is provided with connecting block (11), and the top of connecting block (11) and the bottom swing joint of hydraulic ram (4), the bottom of connecting block (11) is provided with locating piece (10), and the bottom of locating piece (10) is provided with return bend mechanism (9), and the top of return bend mechanism (9) and the bottom fixed connection of locating piece (10), the below of mechanism (9) is provided with cooperation mechanism (6), and the left end (12) of cooperation mechanism (6) are provided with the left end fixing device (12), the utility model discloses a compression spring, including support ring (17), compression spring (14), support ring (17), connecting rod (15) and inner ring fixed connection of connecting rod (15), connecting ring (17) are provided with contact block (5) at both ends at mating mechanism (6) top, and the quantity of contact block (5) is two, and the bottom of mating mechanism (6) is provided with lower carriage (7), and the both ends fixed connection of lower carriage (7) and support (3), be provided with holding ring (17) directly over mating mechanism (6), the inside of holding ring (17) evenly is provided with connecting ball (13), the surface symmetry of connecting ball (13) is provided with expansion ring (16), compression spring (14) have been cup jointed to the surface of expansion ring (16), and the both ends of compression spring (14) are connected with the surface fixed connection of connecting ball (13), the axle center department of holding 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) is connected with the surface fixed connection of magnetic ball (18).

2. An automated pipe bending apparatus according to claim 1, wherein: the contact block is characterized in that rollers (52) are symmetrically arranged at two ends of the contact block (5), shaft holes (51) are formed in the rollers (52), a shrinkage mechanism (54) is arranged on the surface of the contact block (5), sleeves (53) are arranged at two ends of the shrinkage mechanism (54), and the tops of the shrinkage mechanism (54) are fixedly connected with the bottoms of the sleeves (53).

3. An automated pipe bending apparatus according to claim 2, wherein: the shrinkage mechanism (54) comprises a contact plate (541), extrusion blocks (542) are symmetrically arranged at the bottoms of the two ends of the contact plate (541), shrinkage springs (545) are arranged at the bottoms of the extrusion blocks (542), the top ends of the shrinkage springs (545) are fixedly connected with the bottoms of the extrusion blocks (542), bottom blocks (546) are arranged at the bottom ends of the shrinkage springs (545), the tops of the bottom blocks (546) are fixedly connected with the bottom ends of the shrinkage springs (545), rotating shafts (543) are uniformly arranged in the centers of the bottoms of the contact plate (541), folding rods (544) are symmetrically arranged at the two ends of the rotating shafts (543), and the bottoms of the folding rods (544) are fixedly connected with the tops of the bottom blocks (546).

4. An automated pipe bending apparatus according to claim 1, wherein: the utility model provides a pipe bending mechanism (9) is including fixed block (92), the inside of fixed block (92) is provided with pivot (93), the bilateral symmetry of pivot (93) is provided with friction block (97), the right-hand member of friction block (97) is provided with ejector pin (94), and the left end of ejector pin (94) is provided with fixed column (96) with the right-hand member fixed connection of friction block (97), the left end of fixed column (96) and the right-hand member fixed connection of ejector pin (94), the right-hand member of fixed column (96) is provided with connecting spring (91), the right-hand member fixed connection of left end and fixed column (96) of connecting spring (91), the right-hand member of connecting spring (91) and the inner wall fixed connection of fixed block (92), the top of fixed block (92) evenly is provided with blocking ball (95), the bottom of pivot (93) is provided with bent pipe block (910), the top of bent pipe (910) is provided with contact surface (911), the inside of bent pipe (910) is provided with connecting spring (98), the inside of bent pipe (98) is provided with inner chamber (98), and two ends of bent pipe (99).

5. An automated pipe bending apparatus according to claim 4, wherein: the wrinkle removing mechanism (99) comprises a limiting block (991), a rotary ball (992) is arranged in the limiting block (991), a connecting column (993) is arranged on the outer surface of the rotary ball (992), a wrinkle removing block (994) is arranged at the top of the connecting column (993), and the bottom of the wrinkle removing block (994) is fixedly connected with the top of the connecting column (993).

6. An automated pipe bending apparatus according to claim 1, wherein: the utility model discloses a telescopic device for a car, including cooperation mechanism (6), cooperation mechanism (6) 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 of flexible groove (64) is provided with telescopic link (63), the top of telescopic link (63) is provided with contact ring (62), and the bottom of contact ring (62) and the top fixed connection of telescopic link (63).