Bidirectional pipe bending machine for special pipe

Abstract

The utility model provides a two-way pipe bending machine for a special-shaped pipe. The two-way pipe bending machine comprises a base, a forming part, an ejector block and two bending assemblies. The base is used for being installed on the horizontal plane, and a limiting component used for supporting the straight pipe is arranged on the base. The forming pieces are arranged on one side of the limiting component in parallel in the front-back direction. The forming piece is slidably connected with the base in the front-back direction and is in transmission connection with a first linear driving component. The left side and the right side of the forming piece are both provided with special-shaped faces matched with the bent parts. The ejector block is connected with the base through an elastic reset piece, and the elastic reset piece can drive the ejector block to move to abut against the straight pipe. The two bending assemblies are arranged above the base and located on the left side and the right side of the ejector block correspondingly. The bending assembly is used for abutting against the straight pipe so that the straight pipe can be bent to be attached to the special-shaped face. According to the bidirectional pipe bending machine for the special-shaped pipe, machining of two bent parts can be completed at a time, the number of times of measurement is reduced, and the product quality and the machining efficiency are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of pipe bending equipment, and more specifically relates to a bidirectional pipe bending machine for special-shaped pipes. Background Art

[0002] A pipe bender is a mechanical equipment used to process metal pipes. It can bend straight pipes into various shapes of bends. It is often used to manufacture pipelines, automobile exhaust pipes, bicycle frames, etc. The working principle of a pipe bender is to put straight pipes into the pipe bender and bend the straight pipes into the desired angle and shape by applying force to the processing part of the straight pipes.

[0003] Figure 1 The figure shows a special-shaped tube having two bends, and the two bends face the same side. During the processing of this type of special-shaped tube, the worker needs to measure and process it twice by a tube bending machine to complete the preparation.

[0004] The inventors have found that the two measurement processes will reduce the processing efficiency, and the two processing processes will lead to increased errors and reduced product quality. Utility Model Content

[0005] The purpose of the present application is to provide a bidirectional pipe bending machine for special-shaped pipes, so as to solve the technical problems in the prior art that during the bending of special-shaped pipes, two measurement processes will reduce the processing efficiency, and two processing processes will lead to increased errors and reduced product quality.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted in the present application is: to provide a bidirectional pipe bending machine for a special-shaped pipe, wherein the special-shaped pipe has two bending parts facing the same side, and is characterized in that it includes:

[0007] A base, which is used to be installed on a horizontal plane and has a limiting member thereon for supporting the straight pipe so that the axial direction of the straight pipe is parallel to the left-right direction;

[0008] A forming member is arranged in parallel on one side of the limiting member along the front-to-back direction; the forming member is slidably connected to the base along the front-to-back direction, and is transmission-connected with a first linear driving member; and both left and right sides of the forming member adopt profiled surfaces adapted to the curved portion; a side of the forming member close to the limiting member has a limiting groove, and left and right ends of the limiting groove extend to the two profiled surfaces respectively;

[0009] A top block is arranged in parallel on the other side of the limiting member along the front-back direction; the top block is connected to the base through an elastic reset member, and the elastic reset member can drive the top block to move to abut against the straight pipe; and

[0010] Two sets of bending components are both arranged above the base, and the two sets of bending components are respectively located on the left and right sides of the top block;

[0011] Wherein, the bending assembly is used to abut against the straight tube so that the straight tube is bent to fit the special-shaped surface.

[0012] Preferably, the first linear drive component is a first cylinder; the first cylinder is fixedly disposed on the base, and an output end thereof is fixedly connected to the molded part.

[0013] Preferably, the bending assembly comprises:

[0014] a fixed roller, which is arranged on the base, has an axis direction parallel to the up-down direction, and is rotatably connected to the base; and

[0015] A movable roller is arranged on the base, the axis direction of which is parallel to the up-down direction, and the movable roller is connected to the base through a second linear driving member; the second linear driving member can drive the movable roller to move toward the forming part;

[0016] When the straight tube is embedded in the limiting groove, the fixed roller is suitable for abutting the straight tube; at the same time, the second linear driving member can drive the movable roller to move to abut the straight tube, so that the end of the straight tube is bent to fit the special-shaped surface.

[0017] Preferably, the second linear driving member is a second cylinder; the second cylinder is fixedly arranged on the base, and an output end thereof is fixedly connected to the movable roller.

[0018] Preferably, the outer walls of the fixed roller and the movable roller are provided with grooves for the straight tube part to be embedded.

[0019] Preferably, the elastic return member comprises two compression springs arranged in parallel along the left-right direction, and two ends of the two compression springs are respectively connected to the top block and the base;

[0020] When the forming member abuts against the top block, the two compression springs are both in an elastically compressed state.

[0021] Preferably, the limiting member comprises:

[0022] Two limiting members are arranged in parallel on the left and right sides of the forming member, and the two limiting members are respectively used to abut against the two ends of the straight tube to limit the left and right movement of the straight tube.

[0023] Preferably, the limiting member comprises:

[0024] A mounting plate fixedly disposed on the upper side of the base; and

[0025] A baffle plate is used to abut against the end of the straight pipe, is located above the mounting plate, and is hinged to the mounting plate; the baffle plate has a boss on one side close to the molding;

[0026] When the baffle plate swings toward the forming member, the boss is adapted to abut against the base so that the baffle plate is perpendicular to the base.

[0027] Preferably, the bidirectional pipe bender further comprises:

[0028] Two positioning members are arranged in parallel on the left and right sides of the forming member; the positioning members are used to abut against the outer wall of the straight pipe material to limit the straight pipe material from leaving the limiting groove.

[0029] Preferably, the positioning member comprises:

[0030] The positioning sleeve adopts a tubular structure, the interior of which is used for the straight pipe to be inserted; the axis of the positioning sleeve coincides with the axis of the limiting groove; the positioning sleeve has a notch on the side facing the forming part for the straight pipe to pass through in the radial direction; and

[0031] A bracket, which is arranged on the base and connected to the bottom surface of the positioning sleeve;

[0032] When the straight tube is embedded in the limiting groove, the positioning sleeve can limit the straight tube from escaping from the limiting groove; when the forming member drives the straight tube to move toward the top block, the straight tube can escaping from the positioning sleeve through the notch.

[0033] In the embodiment of the present application, the staff installs the cut straight pipe on the base through the limiting component, and the straight pipe is embedded in the limiting groove on the forming part; when bending, the first linear driving component drives the forming part to move toward the top block, at this time, the top block and the forming part cooperate to clamp the straight pipe; during the movement of the straight pipe, the two groups of bending components are respectively suitable for abutting the two ends of the straight pipe, so that the straight pipe is bent until it fits into the two special-shaped surfaces on the forming part; after the bending is completed, the first linear driving component drives the forming part to return to the initial position, at this time, the top block is reset under the drive of the elastic reset member, and then the staff removes the special-shaped pipe on the forming part to complete the processing.

[0034] Compared with the prior art, the bidirectional pipe bending machine for special-shaped pipes provided in the embodiment of the present application can complete the processing of two bending parts at one time, reduce the number of measurements, improve the quality of special-shaped pipe products, and also improve the bending processing efficiency of special-shaped pipes. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0036] Figure 1 It is a schematic diagram of the main structure of a special-shaped tube in the prior art;

[0037] Figure 2 A schematic diagram of the three-dimensional structure of a bidirectional pipe bender for special-shaped pipes provided in an embodiment of the present application;

[0038] Figure 3 The main structure diagram of the bidirectional pipe bending machine for special-shaped pipes provided in the embodiment of the present application Figure 1 ;

[0039] Figure 4 The main structure diagram of the bidirectional pipe bending machine for special-shaped pipes provided in the embodiment of the present application Figure 2 ;

[0040] Figure 5 The main structure diagram of the bidirectional pipe bending machine for special-shaped pipes provided in the embodiment of the present application Figure 3 ;

[0041] Figure 6 for Figure 2 Schematic diagram of the enlarged structure of the A area in the middle;

[0042] Among them, the reference numerals in the figure are:

[0043] 1. Base; 2. Forming part; 21. Limiting groove; 22. Special-shaped surface; 23. First linear drive component; 3. Top block; 4. Elastic reset member; 5. Bending assembly; 51. Fixed roller; 52. Movable roller; 53. Groove; 54. Second linear drive component; 6. Limiting member; 61. Mounting plate; 62. Baffle; 621. Boss; 7. Positioning member; 71. Positioning sleeve; 72. Bracket; 8. Straight pipe; 9. Special-shaped pipe; 91. Bending part. DETAILED DESCRIPTION

[0044] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0045] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0046] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0047] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0048] Please also read Figures 1 to 6 The bidirectional pipe bending machine for special-shaped pipes provided in the present application is now described. The bidirectional pipe bending machine for special-shaped pipes comprises a base 1, a forming part 2, a top block 3 and two sets of bending components 5.

[0049] Figure 1 The figure shows a special-shaped tube 9 having two bending parts 91, and the two bending parts 91 face the same side. In the processing of such special-shaped tube 9, the staff needs to measure and process it through the tube bending machine twice to complete the preparation. The two measurement processes will reduce the processing efficiency, and the two processing processes will lead to increased errors and reduced product quality. Based on the technical problems in the bending process of the above-mentioned special-shaped tube 9, the following technical solutions are proposed:

[0050] The base 1 is used for installation on a horizontal plane, and has a limiting component thereon for supporting the straight pipe 8 so that the axial direction of the straight pipe 8 is parallel to the left-right direction.

[0051] The forming part 2 is arranged in parallel on one side of the limiting member along the front-to-back direction; the forming part 2 is slidably connected to the base 1 along the front-to-back direction, and is transmission-connected with a first linear driving member 23; and the left and right sides of the forming part 2 both adopt special-shaped surfaces 22 that are compatible with the bending portion 91; the forming part 2 has a limiting groove 21 on one side close to the limiting member, and the left and right ends of the limiting groove 21 extend to the two special-shaped surfaces 22 respectively.

[0052] By adopting the above technical solution, the limiting groove 21 can limit the up and down movement of the straight tube 8, thereby preventing the straight tube 8 from being separated from the molded part 2 during the bending process.

[0053] The top block 3 is arranged in parallel along the front-to-back direction on the other side of the limiting component; the top block 3 is connected to the base 1 through an elastic reset member 4, and the elastic reset member 4 can drive the top block 3 to move to abut the straight pipe 8. After the bending is completed, the elastic reset member 4 can also drive the top block 3 to reset.

[0054] The two sets of bending components 5 are both arranged above the base 1 , and the two sets of bending components 5 are respectively located on the left and right sides of the top block 3 ; wherein the bending components 5 are used to abut against the straight pipe 8 so that the straight pipe 8 is bent to fit the profiled surface 22 .

[0055] In the embodiment of the present application, the staff installs the cut straight pipe 8 on the base 1 through the limiting component, and the straight pipe 8 is embedded in the limiting groove 21 on the forming part 2; when bending, the first linear driving component 23 drives the forming part 2 to move toward the top block 3, at this time, the top block 3 and the forming part 2 cooperate to clamp the straight pipe 8; during the movement of the straight pipe 8, the two groups of bending components 5 are respectively suitable for abutting the two ends of the straight pipe 8, so that the straight pipe 8 is bent until it fits into the two special-shaped surfaces 22 on the forming part 2; after the bending is completed, the first linear driving component 23 drives the forming part 2 to return to the initial position, at this time, the top block 3 is reset under the drive of the elastic reset member 4, and then the staff removes the special-shaped tube 9 on the forming part 2 to complete the processing.

[0056] Compared with the prior art, the bidirectional pipe bending machine for special-shaped pipes provided in the embodiment of the present application can complete the processing of two bending parts 91 at one time, reduce the number of measurements, improve the quality of the special-shaped pipe 9 product, and also improve the bending processing efficiency of the special-shaped pipe 9.

[0057] In some embodiments, please refer to Figures 2 to 5 As a specific embodiment of the bidirectional pipe bending machine for special-shaped pipes provided in the present application, the first linear driving component 23 is a first cylinder; the first cylinder is fixedly arranged on the base 1, and its output end is fixedly connected to the forming part 2.

[0058] The first cylinder is a linear cylinder. After the compressed gas is introduced, its output end can be extended or shortened along a straight line. It has the advantages of simple use and maintenance and low cost. By adopting the above technical solution, the linear movement of the molded part 2 can be achieved.

[0059] In some embodiments, please refer to Figures 2 to 5 As a specific embodiment of the bidirectional pipe bender for special-shaped pipes provided in the present application, the bending assembly 5 includes a fixed roller 51 and a movable roller 52 .

[0060] The fixed roller 51 is disposed on the base 1 , with its axis direction parallel to the up-down direction, and is rotatably connected to the base 1 .

[0061] The movable roller 52 is disposed on the base 1 , with its axis direction parallel to the up-down direction, and is connected to the base 1 via a second linear drive member 54 ; the second linear drive member 54 can drive the movable roller 52 to move toward the molded part 2 .

[0062] When the straight tube 8 is embedded in the limiting groove 21 , the fixed roller 51 is suitable for abutting the straight tube 8 ; at the same time, the second linear driving member 54 can drive the movable roller 52 to move to abut the straight tube 8 so that the end of the straight tube 8 is bent to fit the special-shaped surface 22 .

[0063] When the first linear driving member 23 drives the formed part 2 to abut against the top block 3 and continue to move forward, the fixed roller 51 is suitable for first abutting against the straight tube 8 to cause the straight tube 8 to undergo initial bending; then the second linear driving member 54 is suitable for driving the movable roller 52 to move toward the formed part 2 until it abuts against the straight tube 8, so that the straight tube 8 undergoes further bending until it fits with the formed part 2.

[0064] By adopting the above technical solutions, please refer to Figures 3 to 5 , that is, the action flow of the technical solution of this application during the bending operation, which is divided into three steps: loading, preliminary bending and final bending; dividing the bending process into two steps can make the straight pipe 8 more gentle during bending, avoid excessive bending impact, and cause deformation and damage of the bent portion 91 of the straight pipe 8.

[0065] In some embodiments, see Figures 2 to 5 As a specific embodiment of the bidirectional pipe bending machine for special-shaped pipes provided in the present application, the second linear driving member 54 is a second cylinder; the second cylinder is fixedly arranged on the base 1, and its output end is fixedly connected to the movable roller 52.

[0066] The second cylinder is a linear cylinder. After the compressed gas is introduced, its output end can be extended or shortened along a straight line. It has the advantages of simple use and maintenance and low cost. By adopting the above technical solution, the linear movement of the movable roller 52 can be achieved.

[0067] In some embodiments, please refer to Figures 2 to 5 As a specific embodiment of the bidirectional pipe bending machine for special-shaped pipes provided in the present application, the outer walls of the fixed roller 51 and the movable roller 52 are provided with grooves 53 for partially embedding the straight pipe 8.

[0068] By adopting the above technical solution, when the fixed roller 51 and the movable roller 52 abut against the straight tube 8, the grooves 53 thereon can prevent the contact parts of the straight tube 8 with the fixed roller 51 and the movable roller 52 from shifting up and down, thereby improving the bending quality of the straight tube 8.

[0069] In some embodiments, please refer to Figures 1 to 5 As a specific embodiment of the bidirectional pipe bending machine for special-shaped pipes provided in the present application, the elastic reset member 4 includes two compression springs arranged in parallel along the left-right direction, and the two ends of the two compression springs are respectively connected to the top block 3 and the base 1; when the forming member 2 abuts against the top block 3, the two compression springs are in an elastic compression state.

[0070] The compression spring has the advantages of low cost, easy installation, safe use and high durability. By adopting the above technical solution, when the first linear drive component 23 drives the forming part 2 to abut against the top block 3 and continue to move forward, the two compression springs can ensure that the top block 3 is always in contact with the forming part 2, thereby preventing the straight pipe 8 from shifting during the bending process. After the bending is completed, the two compression springs can also realize the automatic resetting of the top block 3.

[0071] In some embodiments, please refer to Figures 2 to 6 As a specific embodiment of the bidirectional pipe bender for special-shaped pipes provided in the present application, the limiting member includes two limiting members 6

[0072] Two limit members 6 are arranged side by side on the left and right sides of the forming member 2 . The two limit members 6 are respectively used to abut against the two ends of the straight tube 8 to limit the left and right movement of the straight tube 8 .

[0073] By adopting the above technical solution, before bending, the staff first cuts the long tube into multiple straight tubes 8 of the required size; when bending the special-shaped tube 9, the staff places the straight tube 8 on the limiting components. The two limiting components 6 can ensure that each time the straight tube 8 is placed, the positions of the left and right ends of the straight tube 8 relative to the molded part 2 are uniform, which eliminates the measurement step in the bending process and improves efficiency.

[0074] In some embodiments, please refer to Figures 1 to 4 As a specific implementation of the bidirectional pipe bending machine for special-shaped pipes provided in the present application, the limiting member 6 includes a mounting plate 61 and a baffle 62 .

[0075] The mounting plate 61 is fixedly disposed on the upper side of the base 1 .

[0076] The baffle 62 is used to abut against the end of the straight pipe 8, is located above the mounting plate 61, and is hinged to the mounting plate 61; the baffle 62 has a boss 621 on the side close to the molded part 2; when the baffle 62 swings toward the molded part 2, the boss 621 is suitable for abutting against the base 1 to make the baffle 62 perpendicular to the base 1.

[0077] By adopting the above technical solution, when installing the straight pipe 8, the baffle 62 can be rotated toward the mounting plate 61 to avoid the installation space of the straight pipe 8. When bending, the baffle 62 is flipped to be parallel to the up and down direction and abut against the end of the straight pipe 8.

[0078] In some embodiments, please refer to Figures 1 to 5 As a specific embodiment of the bidirectional pipe bending machine for special-shaped pipes provided in the present application, the bidirectional pipe bending machine also includes two positioning members 7.

[0079] Two positioning members 7 are arranged side by side on the left and right sides of the forming member 2 ; the positioning members 7 are used to abut against the outer wall of the straight tube 8 to limit the straight tube 8 from leaving the limiting groove 21 .

[0080] By adopting the above technical solution, the straight pipe 8 can be quickly positioned, saving time and effort.

[0081] In some embodiments, as a specific implementation of the bidirectional pipe bending machine for special-shaped pipes provided in the present application, the positioning member 7 includes a positioning sleeve 71 and a bracket 72 .

[0082] The positioning sleeve 71 is a tubular structure, and the interior thereof is used for inserting the straight pipe 8; the axis of the positioning sleeve 71 coincides with the axis of the limiting groove 21; and the side of the positioning sleeve 71 facing the molded part 2 has a notch for the straight pipe 8 to pass through in the radial direction.

[0083] The bracket 72 is disposed on the base 1 and connected to the bottom surface of the positioning sleeve 71 .

[0084] When the straight tube 8 is embedded in the limiting groove 21 , the positioning sleeve 71 can prevent the straight tube 8 from escaping from the limiting groove 21 ; when the forming part 2 drives the straight tube 8 to move toward the top block 3 , the straight tube 8 can escaping from the positioning sleeve 71 through the notch.

[0085] By adopting the above technical solution, it is possible to achieve rapid positioning of the straight tube 8 while avoiding interference with the straight tube 8 during the bending process, thereby improving the product quality of the special-shaped tube 9.

[0086] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A bidirectional pipe bender for special-shaped pipes, wherein the special-shaped pipe has two bending parts facing the same side; characterized in that: include: A base, which is used to be installed on a horizontal plane and has a limiting member thereon for supporting the straight pipe so that the axial direction of the straight pipe is parallel to the left-right direction; A forming member is arranged in parallel on one side of the limiting member along the front-to-back direction; the forming member is slidably connected to the base along the front-to-back direction, and is transmission-connected with a first linear driving member; and both left and right sides of the forming member adopt profiled surfaces adapted to the curved portion; a side of the forming member close to the limiting member has a limiting groove, and left and right ends of the limiting groove extend to the two profiled surfaces respectively; A top block is arranged in parallel on the other side of the limiting member along the front-back direction; the top block is connected to the base through an elastic reset member, and the elastic reset member can drive the top block to move to abut against the straight pipe; and Two sets of bending components are both arranged above the base, and the two sets of bending components are respectively located on the left and right sides of the top block; Wherein, the bending assembly is used to abut against the straight tube so that the straight tube is bent to fit the special-shaped surface.

2. The bidirectional pipe bending machine for special-shaped pipes according to claim 1, characterized in that: The first linear driving component is a first cylinder; the first cylinder is fixedly arranged on the base, and an output end thereof is fixedly connected to the forming part.

3. The bidirectional pipe bending machine for special-shaped pipes according to claim 1, characterized in that: The bending assembly comprises: A fixed roller, which is arranged on the base, has an axis direction parallel to the up-down direction, and is rotatably connected to the base; and A movable roller is arranged on the base, the axis direction of which is parallel to the up-down direction, and the movable roller is connected to the base through a second linear driving member; the second linear driving member can drive the movable roller to move toward the forming part; When the straight tube is embedded in the limiting groove, the fixed roller is suitable for abutting the straight tube; at the same time, the second linear driving member can drive the movable roller to move to abut the straight tube, so that the end of the straight tube is bent to fit the special-shaped surface.

4. The bidirectional pipe bending machine for special-shaped pipes according to claim 3, characterized in that: The second linear driving component is a second cylinder; the second cylinder is fixedly arranged on the base, and an output end thereof is fixedly connected to the movable roller.

5. The bidirectional pipe bending machine for special-shaped pipes according to claim 3, characterized in that: The outer walls of the fixed roller and the movable roller are both provided with grooves for the straight pipe part to be embedded.

6. The bidirectional pipe bending machine for special-shaped pipes according to claim 1, characterized in that: The elastic return member comprises two compression springs arranged in parallel along the left-right direction, and the two ends of the two compression springs are respectively connected to the top block and the base; When the forming member abuts against the top block, the two compression springs are both in an elastically compressed state.

7. The bidirectional pipe bending machine for special-shaped pipes according to claim 1, characterized in that: The limiting component comprises: Two limiting members are arranged in parallel on the left and right sides of the forming member, and the two limiting members are respectively used to abut against the two ends of the straight tube to limit the left and right movement of the straight tube.

8. The bidirectional pipe bending machine for special-shaped pipes according to claim 7, characterized in that: The limiting member comprises: A mounting plate fixedly disposed on the upper side of the base; and A baffle plate is used to abut against the end of the straight pipe, is located above the mounting plate, and is hinged to the mounting plate; the baffle plate has a boss on one side close to the molding; When the baffle plate swings toward the forming member, the boss is adapted to abut against the base so that the baffle plate is perpendicular to the base.

9. The bidirectional pipe bending machine for special-shaped pipes according to claim 1, characterized in that: The bidirectional pipe bender also includes: Two positioning members are arranged in parallel on the left and right sides of the forming member; the positioning members are used to abut against the outer wall of the straight pipe material to limit the straight pipe material from leaving the limiting groove.

10. The bidirectional pipe bending machine for special-shaped pipes according to claim 9, characterized in that: The positioning member comprises: The positioning sleeve adopts a tubular structure, the interior of which is used for the straight pipe to be inserted; the axis of the positioning sleeve coincides with the axis of the limiting groove; the positioning sleeve has a notch on the side facing the forming part for the straight pipe to pass through in the radial direction; and A bracket, which is arranged on the base and connected to the bottom surface of the positioning sleeve; When the straight tube is embedded in the limiting groove, the positioning sleeve can limit the straight tube from escaping from the limiting groove; when the forming member drives the straight tube to move toward the top block, the straight tube can escaping from the positioning sleeve through the notch.

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