Hollow pipe bending tool

Abstract

The utility model relates to the technical field of hollow pipe machining, in particular to a hollow pipe bending tool which comprises a supporting frame used for containing the two ends of a hollow pipe, a pressing block used for pushing part of the area of the hollow pipe to be bent towards the supporting frame and a supporting spring arranged in the hollow pipe in a penetrating mode. The supporting spring provides supporting force for the hollow pipe in the hollow pipe, so that the hollow pipe is kept in a stable shape in the bending process, and the stability of the hollow pipe in the bending process is improved.

Description

Technical Field

[0001] This application relates to the field of hollow tube processing technology, and in particular to a hollow tube bending tool. Background Technology

[0002] Hollow tubes are steel materials with a hollow cross-section and a length much greater than the diameter or circumference of the cross-section. They are widely used as support frames for furniture. In the structure of some furniture, hollow tubes often need to be bent.

[0003] Reference Figure 1 The hollow tube 1 has a cavity 11 to reduce its weight while maintaining the same structural strength. In related technologies, the bending technology of hollow tubes is usually as follows: the hollow tube is fixed on a bending machine, and then a torque is applied to the position where the hollow tube needs to be bent, thereby causing the hollow tube to undergo plastic deformation.

[0004] Regarding the aforementioned technologies, the inventors believe that when using the above-mentioned methods to bend hollow tubes, the tube wall of the hollow tube has a weak ability to withstand the stress generated during the bending process, and the hollow tube is prone to deformation or even cracks, thereby affecting the performance of the furniture. There is still room for improvement. Utility Model Content

[0005] In order to improve the problem that the hollow tube wall has a weak ability to withstand the stress generated during the bending process, and the hollow tube is prone to deformation and even cracks, thus affecting the performance of the furniture, this application provides a hollow tube bending fixture.

[0006] The hollow tube bending fixture provided in this application adopts the following technical solution:

[0007] A hollow tube bending fixture includes support frames for placing both ends of the hollow tube, pressure blocks for pushing a portion of the hollow tube towards the support frames, and support springs inserted inside the hollow tube.

[0008] By adopting the above technical solution, a support spring is inserted inside the hollow tube. When the pressure block applies pressure to the hollow tube on the side closest to the support frame, causing the hollow tube to bend towards the support frame, the support spring provides a supporting force to the hollow tube towards the pressure block, allowing the hollow tube to maintain a stable shape during the bending process and improving the shape stability of the hollow tube during bending. On the other hand, during the bending process of the hollow tube, the support spring can adjust the pressure difference between the inside and outside of the steel tube, thereby reducing the stress concentration caused by uneven pressure, thus alleviating and dispersing the generated stress and improving the stability of the hollow tube during bending.

[0009] Optionally, the support frame is rotatably connected to two support blocks that abut against both ends of the hollow tube.

[0010] By adopting the above technical solution, during the bending process, both ends of the hollow tube will tilt towards the side where the hollow tube is bent. The rotation setting of the support block causes the support block to rotate with the rotation of both ends of the hollow tube. The side wall of the support block abutting against the hollow tube is always in close contact with the hollow tube, which avoids the area of ​​the support surface from decreasing as the two ends of the hollow tube rotate. This effectively disperses the pressure between the hollow tube and the support frame and reduces the loss generated by the hollow tube and the support frame during the bending process.

[0011] Optionally, the support block has a first limiting groove for embedding the hollow tube on the side near the pressure block, and the pressure block has a second limiting groove on the side near the support frame where the bottom of the groove abuts against the hollow tube.

[0012] By adopting the above technical solution, the hollow tube is embedded in the first limiting groove and the second limiting groove for bending treatment, so as to restrict the movement of the hollow tube along the length direction perpendicular to itself during the bending process, and prevent the hollow tube from flying off the support frame to the side perpendicular to its length direction when it is under pressure, thereby improving the stability and safety of the hollow tube bending process.

[0013] Optionally, the support block is provided with a return spring, one end of which is located on the side of the support block away from the pressure block, and the other end of which is located on the side of the support frame away from the pressure block. The return spring is in a stretched state.

[0014] By adopting the above technical solution, when the support block rotates with the rotation of both ends of the hollow tube, the return spring is gradually stretched with the rotation of the support block. The return spring applies a return force to the support block. When the support block loses the force applied by the hollow tube to drive the support block to rotate, the support block is pulled by the return spring and rotates to the angle before it was driven by the hollow tube to rotate, which improves the convenience of rotating the support block to the initial angle.

[0015] Optionally, the support block is provided with a mounting groove, a through hole is provided on one side of the groove wall, and a threaded hole is provided on the side of the groove wall away from the groove wall with the through hole. The threaded hole and the through hole are coaxially arranged. The support block is provided with a mounting post, which passes through the through hole and the mounting groove and is threaded into the threaded hole. One end of the return spring is hooked onto the mounting post.

[0016] By adopting the above technical solution, the setting of the mounting groove provides space for the reset spring to be hooked onto the mounting post, improving the convenience of hooking the reset spring onto the mounting post; on the other hand, with the reset spring hooked onto the mounting post, it is only necessary to stretch the reset spring to shift it to one side of the mounting post to install the reset spring onto the support block or remove it from the support block, improving the convenience of installing and removing the reset spring.

[0017] Optionally, the support frame is further provided with an embedded post, and the side of the support frame away from the support block is provided with an embedded groove. The embedded post is embedded in the embedded groove. The support frame is also provided with an installation hole. The embedded groove and the installation hole are connected. Both ends of the embedded post abut against the bottom of the embedded groove. One end of the reset spring passes through the installation hole and is hooked onto the embedded post.

[0018] By adopting the above technical solution, the setting of the mounting hole provides space for the reset spring to be hooked onto the embedded post, improving the convenience of hooking the reset spring onto the embedded post; on the other hand, with the reset spring hooked onto the embedded post, it is only necessary to stretch the reset spring to shift it to one side of the embedded post to install the reset spring onto the support frame or remove it from the support frame, thus improving the convenience of installing and removing the reset spring.

[0019] Optionally, the support frame includes an adjustable distance assembly, two moving parts, and two guide rails. Both moving parts are slidably connected to the guide rails along their length. The adjustable distance assembly includes two first connecting rods and two second connecting rods. One end of each of the two first connecting rods is hinged to the opposite side of the two moving parts, and the other ends of the two first connecting rods are rotatably connected to each other. One end of each of the two second connecting rods is hinged to the opposite side of the two moving parts, and the other ends of the two second connecting rods are rotatably connected to each other.

[0020] By adopting the above technical solution, since the lengths of the first connecting rod and the second connecting rod are fixed, the closer the included angle between the two first connecting rods is to a flat angle, the farther the distance between the two moving parts becomes, and the longer the length of the hollow tube that the support frame can support becomes, thus improving the versatility of the hollow tube bending fixture. On the other hand, the setting of the guide rail restricts the movement direction of the two moving parts, preventing the moving parts from moving in directions other than the length direction of the guide rail, thereby improving the stability of adjusting the distance between the moving parts.

[0021] Optionally, the adjusting assembly further includes a first connecting block, a second connecting block, and a screw. The first connecting block is hinged to one end of each of the two first connecting rods that are close to each other. The second connecting block is hinged to one end of each of the two second connecting rods that are close to each other. The screw is threadedly connected to the first connecting block and the second connecting block in sequence. The threads on both sides of the screw have opposite directions of rotation.

[0022] By adopting the above technical solution, the first connecting block and the second connecting block are driven to move along the length of the screw by rotating the screw. Since the threads on both sides of the screw have opposite directions of rotation, when the screw rotates, the first connecting block and the second connecting block driven by the screw move in opposite directions, and the distance between the first connecting block and the second connecting block changes, which improves the convenience of adjusting the distance between the two moving parts. On the other hand, the moving directions of the first connecting block and the second connecting block are not in the same direction as the rotation direction of the screw. Therefore, the pressure of the pressure block cannot drive the screw to rotate. When the screw stops rotating, the distance between the first connecting block and the second connecting block no longer changes. At this time, the distance between the two moving parts is fixed, which improves the stability of adjusting the distance between the two moving parts.

[0023] Optionally, an adjustment handle is fixedly connected to one end of the screw.

[0024] By adopting the above technical solution, compared with directly rotating the screw to adjust the distance between the moving parts, the adjustment handle allows the radius of rotation required to rotate the screw to be larger, reducing the force required to rotate the screw and improving the convenience of adjusting the distance by rotating the screw.

[0025] Optionally, the guide rail is provided with connecting posts, and the two ends of the connecting posts are respectively fixedly connected to the two guide rails.

[0026] By adopting the above technical solution, the relative distance between the two guide rails is fixed by the connecting column, which prevents the two guide rails from moving away from each other and causing the moving part to detach from the guide rail, thus improving the stability of the moving part slidingly connected to the guide rail.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. The support spring provides support force to the hollow tube inside the hollow tube, so that the hollow tube maintains a stable shape during the bending process, thus improving the stability of the hollow tube during the bending process;

[0029] 2. The hollow tube is embedded in the first limiting groove and the second limiting groove for bending, which prevents the hollow tube from flying in the direction perpendicular to its own length, thus improving the stability and safety of the bending process.

[0030] 3. The return spring applies a return force to the support block, and the support block rotates to the angle before the rotation due to the return spring force, which improves the convenience of rotating the support block to the initial position. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of a hollow tube in related technologies.

[0032] Figure 2This is a schematic diagram of the structure of a hollow tube bending tool in an embodiment of this application.

[0033] Figure 3 This is an exploded partial view of the guide rail and connecting column in the embodiments of this application.

[0034] Figure 4 This is an exploded partial view of the reset assembly and support frame in the embodiments of this application.

[0035] Explanation of reference numerals in the attached drawings: 1. Hollow tube; 11. Cavity; 2. Support frame; 21. Guide rail; 211. Guide groove; 212. Connecting column; 22. Moving part; 221. Sliding part; 23. Adjustment assembly; 231. First connecting rod; 232. First connecting block; 233. Second connecting rod; 234. Second connecting block; 235. Screw; 2351. Adjustment handle; 24. Support block; 241. First limiting groove; 242. Reset assembly; 2421. Mounting column; 2422. Embedding column; 2423. Reset spring; 243. Mounting groove; 2431. Through hole; 2432. Threaded hole; 25. Embedding groove; 26. Mounting hole; 3. Pressure block; 31. Second limiting groove; 4. Support spring. Detailed Implementation

[0036] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0037] Reference Figure 1 The hollow tube 1 has a cavity 11 to reduce its weight while maintaining the same structural strength.

[0038] This application discloses a hollow tube bending fixture.

[0039] Reference Figure 2 The hollow tube 1 bending fixture includes a support frame 2, a pressure block 3, and a support spring 4. Both ends of the hollow tube 1 are placed on the support frame 2, and the pressure block 3 abuts against the side of the hollow tube 1 away from the support frame 2. The support frame 2 and the pressure block 3 work together to bend the hollow tube 1. The support spring 4 passes through the hollow tube 1 to relieve the stress generated on the tube wall during the bending process.

[0040] Reference Figure 2 and Figure 3The support frame 2 includes guide rails 21, moving parts 22, and adjusting components 23. There are two guide rails 21, each with a guide groove 211 on its opposite side, arranged along the length of the guide rails 21. There are also two moving parts 22, each integrally connected to two sliding parts 221. The sliding parts 221 on both sides of the same moving part 22 are slidably connected to the two guide grooves 211, allowing the moving part 22 to slide along the length of the guide rails 21. To prevent the moving parts 22 from detaching from the guide rails 21 by moving away from each other, connecting posts 212 are fixedly connected to both ends of each guide rail 21. The two ends of the same connecting post 212 are fixedly connected to the two guide rails 21 respectively.

[0041] Reference Figure 2 The adjusting assembly 23 includes a first connecting rod 231, a first connecting block 232, a second connecting rod 233, a second connecting block 234, and a screw 235. There are two first connecting rods 231, one end of which is hinged to one side of each of the two moving parts 22, and the other end of each is hinged to the first connecting block 232. There are also two second connecting rods 233, one end of which is hinged to one side of each of the two moving parts 22, and the other end of each is hinged to the second connecting block 234. The screw 235 passes sequentially through the first connecting block 232 and the second connecting block 234, with the first connecting block 232 and the second connecting block 234 threadedly connected to both sides of the screw 235. The threads on both sides of the screw 235 rotate in opposite directions. Rotating the screw 235 drives the first connecting block 232 and the second connecting block 234 to move closer together, increasing the included angle between the two first connecting rods 231 and the distance between the two moving parts 22. To facilitate the rotation of the screw 235, an adjusting handle 2351 is fixedly connected to one end of the screw 235.

[0042] Reference Figure 2Each support frame 2 has two support blocks 24 rotatably connected to the side away from the guide rail 21. The two ends of the hollow tube 1 abut against the two support blocks 24 respectively, so that when the hollow tube 1 is subjected to pressure from the pressure block 3 and its ends rotate, the contact surfaces between the support blocks 24 and the hollow tube 1 rotate with the rotation of the hollow tube 1's ends. The side of the support block 24 away from the guide rail 21 has a first limiting groove 241, and the two ends of the hollow tube 1 are respectively embedded in the two first limiting grooves 241, with the hollow tube 1 abutting against the bottom of the first limiting groove 241 to prevent the hollow tube 1 from moving along its length perpendicular to itself and falling off the support block 24. The pressure block 3 has a second limiting groove 31. When the pressure block 3 moves toward the side closer to the hollow tube 1, the part of the hollow tube 1 that needs to be bent is embedded in the second limiting groove 31, and the side of the hollow tube 1 away from the support frame 2 abuts against the bottom of the second limiting groove 31, so as to cooperate with the first limiting groove 241 to restrict the movement of the hollow tube 1 along the length direction perpendicular to itself.

[0043] Reference Figure 4 To facilitate the rotation of the support block 24 back to its initial angle, the support block 24 has a reset assembly 242. The reset assembly 242 includes a mounting post 2421, an insert post 2422, and a reset spring 2423. The support block 24 has a mounting groove 243 on the side near the guide rail 21, and a through hole 2431 on one side wall of the mounting groove 243. A threaded hole 2432 is located on the side wall of the mounting groove 243 away from the side wall with the through hole 2431. The threaded hole 2432 and the through hole 2431 are coaxially arranged. The mounting post 2421 passes through the through hole 2431 and the mounting groove 243 and is threaded into the threaded hole 2432 for the reset spring 2423 to engage. The support frame 2 has an insert groove 25 on the side away from the support block 24, and the support frame 2 also has a mounting hole 26, which communicates with the insert groove 25. The embedding post 2422 is embedded in the embedding groove 25, with both ends of the embedding post 2422 abutting the bottom of the groove 25 for the return spring 2423 to hook onto. One end of the return spring 2423 is hooked onto the mounting post 2421, and the other end is hooked onto the embedding post 2422, and the return spring 2423 is in a stretched state. When the support block 24 rotates, the return spring 2423 is stretched along with the rotation of the support block 24, and the return spring 2423 always applies a restoring force to the support block 24. When the support block 24 loses the force driving its own rotation, the return spring 2423 pulls the support block 24 to rotate back to the initial angle.

[0044] The implementation principle of a hollow tube bending fixture according to an embodiment of this application is as follows: rotating the adjusting handle 2351 drives two moving parts 22 to slide along the guide rail 21, so that the distance between the two moving parts 22 matches the length of the hollow tube 1 that needs to be bent; then the support spring 4 is inserted into the hollow tube 1, and the hollow tube 1 is placed on the support block 24, at which time both ends of the hollow tube 1 are embedded in the first limiting groove 241; after aligning the pressure block 3 with the position where the hollow tube 1 needs to be bent, the pressure block 3 is moved to the side closer to the support frame 2, so that the part of the hollow tube 1 that needs to be bent is embedded in the second limiting groove 31; then the pressure block 3 continues to move to the side closer to the support frame 2, pushing the hollow tube 1 to bend to the side closer to the support frame 2.

[0045] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A hollow tube bending fixture, characterized in that: It includes support frames (2) for placing the two ends of the hollow tube (1), pressure blocks (3) for pushing a portion of the hollow tube (1) towards the support frames (2), and support springs (4) inserted inside the hollow tube (1).

2. The hollow tube bending fixture according to claim 1, characterized in that: The support frame (2) is rotatably connected to two support blocks (24) that abut against both ends of the hollow tube (1).

3. The hollow tube bending fixture according to claim 2, characterized in that: The support block (24) has a first limiting groove (241) for the hollow tube (1) to be embedded on the side near the pressure block (3), and the pressure block (3) has a second limiting groove (31) whose bottom abuts against the hollow tube (1) on the side near the support frame (2).

4. The hollow tube bending fixture according to claim 3, characterized in that: The support block (24) is provided with a reset spring (2423). One end of the reset spring (2423) is located on the side of the support block (24) away from the pressure block (3), and the other end of the reset spring (2423) is located on the side of the support frame (2) away from the pressure block (3). The reset spring (2423) is in a stretched state.

5. The hollow tube bending fixture according to claim 4, characterized in that: The support block (24) is provided with an installation groove (243), and a through hole (2431) is provided on one side of the groove wall of the installation groove (243). A threaded hole (2432) is provided on the side of the groove wall away from the groove wall with the through hole (2431). The threaded hole (2432) and the through hole (2431) are coaxially arranged. The support block (24) is provided with an installation post (2421). The installation post (2421) passes through the through hole (2431) and the installation groove (243) and is threaded into the threaded hole (2432). One end of the return spring (2423) is hooked onto the installation post (2421).

6. The hollow tube bending fixture according to claim 4, characterized in that: The support frame (2) is also provided with an embedded post (2422). The support frame (2) is provided with an embedded groove (25) on the side away from the support block (24). The embedded post (2422) is embedded in the embedded groove (25). The support frame (2) is also provided with an installation hole (26). The embedded groove (25) and the installation hole (26) are connected. The two ends of the embedded post (2422) abut against the bottom of the embedded groove (25). One end of the reset spring (2423) passes through the installation hole (26) and hooks onto the embedded post (2422).

7. The hollow tube bending fixture according to claim 1, characterized in that: The support frame (2) includes an adjustment component (23), two moving parts (22) and two guide rails (21). The two moving parts (22) are slidably connected to the guide rails (21) along the length direction of the guide rails (21). The adjustment component (23) includes two first connecting rods (231) and two second connecting rods (233). One end of each of the two first connecting rods (231) is hinged to the opposite side of the two moving parts (22), and the other end of each of the two first connecting rods (231) is rotatably connected to each other. One end of each of the two second connecting rods (233) is hinged to the opposite side of the two moving parts (22), and the other end of each of the two second connecting rods (233) is rotatably connected to each other.

8. The hollow tube bending fixture according to claim 7, characterized in that: The adjustable distance assembly (23) further includes a first connecting block (232), a second connecting block (234), and a screw (235). The first connecting block (232) is hinged to the two first connecting rods (231) at their respective close ends. The second connecting block (234) is hinged to the two second connecting rods (233) at their respective close ends. The screw (235) is threaded onto the first connecting block (232) and the second connecting block (234) in sequence. The threads on both sides of the screw (235) have opposite directions of rotation.

9. A hollow tube bending fixture according to claim 8, characterized in that: An adjusting handle (2351) is fixedly connected to one end of the screw (235).

10. A hollow tube bending fixture according to claim 7, characterized in that: The guide rail (21) is provided with a connecting post (212), and the two ends of the connecting post (212) are respectively fixedly connected to the two guide rails (21).

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