Hydraulic forming machine for U-shaped pipe

Abstract

The utility model provides a U-shaped pipe hydraulic forming machine. The U-shaped pipe hydraulic forming machine comprises a machine base, a pushing assembly, two limiting assemblies and a clamping and positioning assembly. The pushing assembly is arranged on the machine base and provided with a first mold used for pushing a pipe. The two limiting assemblies are connected to the machine base and symmetrically distributed on the two sides of the first mold, each limiting assembly is provided with a second mold which is rotationally arranged, and the two second molds are used for being matched with the first mold to form a U-shaped contour; the clamping and positioning assembly is arranged on the machine base and provided with a clamping piece for fixing the middle of the pipe, and the clamping piece is in sliding fit with the machine base in the pushing direction of the pushing assembly. According to the hydraulic forming machine for the U-shaped pipe, the pushing assembly with the first die is arranged, the pipe is pushed to pass through the two rotating second dies, and the pipe can be restrained and guided more evenly. The position of the pipe is fixed through the clamping and positioning assembly, so that dislocation of the pipe in the pipe bending process is avoided, and the yield is increased.

Description

Technical Field

[0001] This utility model belongs to the field of hydraulic pipe bending technology, specifically relating to a U-shaped pipe hydraulic forming machine. Background Technology

[0002] In the industrial field, U-shaped tubes, with their unique structure, are widely used in piping systems, heat exchangers and other equipment, playing a key role in realizing functions such as fluid transmission and heat exchange.

[0003] In existing technologies, hydraulic pipe bending is a common process for manufacturing U-shaped tubes. Its core operating principle is to use the powerful thrust generated by a hydraulic pusher to gradually push the tube into a pre-set mold. Under the continuous action of the pusher, the tube is forced to bend along the contour of the mold, thus achieving the desired shape.

[0004] In conventional pipe bending processes, the stress distribution on the pipe is uneven. When the pipe is pushed into the pre-set mold, the bent section is a stress concentration area, which easily produces wrinkles, resulting in an uneven surface and frequent ellipticization, severely affecting the quality and subsequent performance of the pipe. Furthermore, when the pipe is bent within the pre-set template, uneven friction between the pipe and the template often causes misalignment and slippage. This not only leads to inconsistent bending lengths at both ends of the pipe but also severely impacts the dimensional accuracy of the U-shaped pipe, ultimately reducing the yield rate, causing material waste, and increasing production costs. Utility Model Content

[0005] This utility model provides a U-shaped tube hydraulic forming machine, which aims to enhance the positioning ability of U-shaped tubes during bending and improve the quality of finished products.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a U-shaped tube hydraulic forming machine is provided, including a machine base, a pushing assembly, two limiting assemblies, and a clamping and positioning assembly; the pushing assembly is disposed on the machine base and has a first mold for pushing the tube; the two limiting assemblies are respectively connected to the machine base and symmetrically distributed on both sides of the first mold, and the limiting assemblies have a second mold that is rotatably disposed, and the two second molds are used to cooperate with the first mold to form a U-shaped profile; the clamping and positioning assembly is disposed on the machine base and has a clamping member that fixes the middle part of the tube, and the clamping member slides in cooperation with the machine base along the pushing direction of the pushing assembly.

[0007] In one possible implementation, the push assembly includes a hydraulic push rod, a mounting frame, a pressure plate, and a first mold; the hydraulic push rod is mounted on the machine base; the mounting frame is connected to the push end of the hydraulic push rod, and a mounting shaft is vertically mounted on the mounting frame; the pressure plate is mounted on the mounting frame and located above the first mold; the first mold is located between the mounting frame and the pressure plate, and the first mold has mounting holes that are inserted into the mounting shaft.

[0008] In some embodiments, a bushing is provided laterally on the mounting bracket, and a rotating shaft is provided on the pressure plate to rotate with the bushing; a first positioning hole is provided on the first mold, and a second positioning hole is provided on the pressure plate to be aligned with the first positioning hole, and a rod is inserted into the first positioning hole and the second positioning hole.

[0009] For example, the base is provided with a first slide groove, which is perpendicular to the pushing direction of the push assembly, and the limiting assembly slides in cooperation with the first slide groove.

[0010] For example, the machine base is provided with a top plate; the limiting component includes a telescopic rod, a first telescopic drive component and a second mold, one end of the telescopic rod abuts against the lower surface of the top plate; the first telescopic drive component is slidably disposed in the first slide groove and its output end is connected to the telescopic rod; the second mold is rotatably disposed on the telescopic rod.

[0011] In one possible implementation, the base is further provided with a second slide groove and a third slide groove, and the clamping and positioning component is slidably connected to the second slide groove and the third slide groove; the second slide groove is arranged along the pushing direction of the push component and is located between the two limiting components; the third slide groove is perpendicular to the second slide groove and is located at the end of the second slide groove near the push component.

[0012] In some embodiments, the clamping member includes a first clamp and a second clamp, the first clamp is slidably connected to a second slide groove, and the first clamp is provided with a second telescopic drive member, the output end of the second telescopic drive member being connected to the second clamp.

[0013] For example, the clamping and positioning assembly further includes a positioning structure having two positioning ends, both of which are slidably connected to a third groove, and the positioning ends are used to fix the ends of the pipe.

[0014] For example, the positioning structure includes a threaded rod, two sliders, two bearing members, and a rotary drive member; the threaded rod is rotatably disposed within a third slide groove; both sliders are sleeved on the threaded rod and slidably connected to the third slide groove, and the two sliders are used to move synchronously relative to each other under the drive of the threaded rod; the two bearing members are respectively disposed on the two sliders and form positioning ends; the rotary drive member is disposed on the machine base, and its output end is connected to one end of the threaded rod.

[0015] In one possible implementation, two sliders are located on either side of the push assembly and have internal threads that engage with the threaded rod in opposite directions.

[0016] The beneficial effects of the U-shaped tube hydraulic forming machine provided by this utility model are as follows: Compared with the prior art, this utility model, by setting a pushing assembly with a first mold, pushes the tube through two limiting assemblies. The limiting assemblies have a rotatably set second mold, which cooperates with the first mold to form a U-shaped profile. During the bending and forming process of the tube between the first and second molds, the tube can be more uniformly constrained and guided under the pushing action of the first mold and the rotating extrusion action of the second mold. During the pushing process of the pushing assembly, the force on each part of the tube is more balanced, thereby effectively reducing quality problems caused by uneven stress, such as wrinkles and ellipticization in the bent section of the tube, and improving the forming quality of the U-shaped tube. The clamping component can fix the middle part of the tube and slides in cooperation with the machine base along the pushing direction of the hydraulic push rod. During the tube bending process, the middle part of the tube is fixed to prevent the tube from slipping and ensure the consistency of the bending length at both ends of the tube, thereby improving the yield of U-shaped tubes. Attached Figure Description

[0017] Figure 1 A three-dimensional structural schematic diagram of the U-shaped tube hydraulic forming machine provided for an embodiment of this utility model;

[0018] Figure 2 A three-dimensional structural diagram of the jacking assembly and limiting assembly provided in this embodiment of the utility model when bending pipes;

[0019] Figure 3 This is a right-view structural diagram of the first and second molds used in this embodiment of the utility model when bending pipes.

[0020] Figure 4 This is an exploded structural diagram of the jacking assembly used in an embodiment of the present utility model;

[0021] Figure 5 A front view of the U-shaped tube hydraulic forming machine provided in this embodiment of the utility model;

[0022] Figure 6 This is a three-dimensional structural diagram of the clamping and positioning component used in the embodiments of this utility model;

[0023] Figure 7 for Figure 6 Enlarged view of region A in the middle;

[0024] Figure 8 for Figure 6 A magnified view of region B in the middle.

[0025] In the diagram: 10. Base; 11. First slide groove; 12. Top plate; 13. Second slide groove; 14. Third slide groove; 20. Pushing assembly; 21. First mold; 211. Mounting hole; 212. First positioning hole; 22. Hydraulic push rod; 23. Mounting bracket; 231. Mounting shaft; 232. Bushing; 24. Pressure plate; 241. Rotating shaft; 242. Second positioning hole; 25. Insert rod; 30. Limiting assembly; 31. Second mold; 32. Telescopic rod; 33. First telescopic drive component; 40. Clamping and positioning assembly; 41. Clamping component; 411. First gripper; 412. Second telescopic drive component; 413. Second gripper; 42. Positioning structure; 421. Threaded rod; 422. Slider; 423. Bearing component; 424. Rotation drive component; 50. Pipe. Detailed Implementation

[0026] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0027] It should be noted that when an element is referred to as being "set on" another element, it can be directly on or indirectly on the other element. It should be understood that the terms "upper," "lower," "front," "rear," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] Please refer to the following: Figures 1 to 8The U-shaped tube hydraulic forming machine provided by this utility model will now be described. The U-shaped tube hydraulic forming machine includes a base 10, a pushing assembly 20, two limiting assemblies 30, and a clamping and positioning assembly 40; the pushing assembly 20 is disposed on the base 10 and has a first mold 21 for pushing the tube 50; the two limiting assemblies 30 are respectively connected to the base 10 and symmetrically distributed on both sides of the first mold 21, and the limiting assemblies 30 have a second mold 31 that is rotatably disposed, and the two second molds 31 are used to cooperate with the first mold 21 to form a U-shaped profile; the clamping and positioning assembly 40 is disposed on the base 10 and has a clamping member 41 that fixes the middle part of the tube 50, and the clamping member 41 slides in cooperation with the base 10 along the pushing direction of the pushing assembly 20.

[0029] It should be noted that you should refer to [link / reference]. Figure 2 and Figure 3 After the pipe 50 is bent and shaped into a U-shape, it has two curved sections and three straight sections. The outline of the first mold 21 also has two curved sections and three straight sections. The second mold 31 can rotate and its middle part can fit against the side wall of the pipe 50, thus forming a U-shaped outline with the first mold 21. The clamping and positioning component 40 clamps and fixes the middle part of the pipe 50, and the pushing component 20 pushes the pipe 50 through the first mold 21. When the pipe 50 abuts against the limiting component 30, the pushing component 20 pushes the pipe 50 through the limiting component 30. The pipe 50 passes through the U-shaped outline between the first mold 21 and the second mold 31, causing both ends of the pipe 50 to bend towards the pushing component 20. Under the continuous pushing of the pusher assembly 20, the middle section of the tube 50 remains in contact with the first mold 21, forming a straight section in the middle. The two ends of the tube 50 are limited by the second mold 31 and bent to fit against the sides of the first mold 21, forming two more straight sections. A curved section is formed between the straight sections at both ends of the tube 50 and the straight section in the middle. Compared to the existing forming method of directly pushing the tube 50 into a preset mold, pushing the tube 50 through the rotating second mold 31 via the first mold 21 allows the curved section of the tube 50 to be uniformly compressed and constrained, improving the forming quality of the U-shaped tube. The clamping and positioning assembly 40's fixation of the tube 50 prevents axial misalignment during bending, improving the quality of the finished product.

[0030] Compared with existing technologies, the U-shaped tube hydraulic forming machine provided by this utility model, by setting a pushing assembly 20 with a first mold 21, pushes the tube 50 through two limiting assemblies 30. The limiting assembly 30 has a rotatably set second mold 31, which cooperates with the first mold 21 to form a U-shaped profile. When the tube 50 is bent and formed between the first mold 21 and the second mold 31, the tube 50 can be more uniformly constrained and guided under the pushing action of the first mold 21 and the rotating extrusion action of the second mold 31. During the pushing process of the pushing assembly 20, the force on each part of the tube 50 is more balanced, thereby effectively reducing quality problems caused by uneven stress such as wrinkles and ellipticization in the bent section of the tube 50, and improving the forming quality of the U-shaped tube. The clamping member 41 can fix the middle part of the tube 50 and slides in cooperation with the machine base 10 along the pushing direction of the hydraulic push rod 22. During the bending process of pipe 50, the middle part of pipe 50 is fixed to prevent misalignment and slippage of pipe 50, ensuring the consistency of bending length at both ends of pipe 50, thereby improving the yield of U-shaped pipes.

[0031] In one possible implementation, please refer to Figure 4 The push assembly 20 includes a hydraulic push rod 22, a mounting frame 23, a pressure plate 24, and a first mold 21. The hydraulic push rod 22 is mounted on the base 10. The mounting frame 23 is connected to the push end of the hydraulic push rod 22, and a mounting shaft 231 is vertically mounted on the mounting frame 23. The pressure plate 24 is mounted on the mounting frame 23 and located above the first mold 21. The first mold 21 is located between the mounting frame 23 and the pressure plate 24, and a mounting hole 211 is provided on the first mold 21, which is inserted into the mounting shaft 231.

[0032] It should be noted that the hydraulic push rod 22, as a power source, transmits thrust to the first mold 21 through the mounting bracket 23, providing a stable and large pushing force to ensure that the pipe 50 can smoothly pass through the U-shaped contour between the first mold 21 and the second mold 31, thus achieving the bending and forming of the pipe 50. The hydraulic push rod 22 is relatively precisely controlled, and the pushing speed and force can be flexibly adjusted according to factors such as the material and specifications of the pipe 50, which is beneficial to improving the adaptability and processing efficiency of the forming machine to different pipes 50. The mounting shaft 231 on the mounting bracket 23 is inserted and engaged with the mounting hole 211 on the first mold 21, which can accurately position the first mold 21 and keep it stable when pushing the pipe 50, ensuring that the pipe 50 moves in a predetermined direction during the pushing process, which is beneficial to improving the accuracy and consistency of the pipe 50 forming. The pressure plate 24 is placed on the mounting frame 23 and located above the first mold 21, fixing the first mold 21 between the mounting frame 23 and the pressure plate 24. This effectively prevents the first mold 21 from shaking or shifting during the pushing process, further enhancing the stability of the pushing assembly 20. This ensures that the pipe 50 is subjected to uniform force during the bending and forming process, which is beneficial to improving the forming quality of the U-shaped pipe.

[0033] The first mold 21 is modularly installed, and the shape inside the first mold 21 can be changed according to production needs to adapt to the production needs of U-shaped pipes of different diameters, reduce production costs, and significantly improve the versatility and utilization of the equipment.

[0034] In some embodiments, please refer to Figure 4 The mounting bracket 23 is provided with a bushing 232 in the horizontal direction, and the pressure plate 24 is provided with a rotating shaft 241 that rotates with the bushing 232; the first mold 21 is provided with a first positioning hole 212, and the pressure plate 24 is provided with a second positioning hole 242 that is aligned with the first positioning hole 212, and is inserted into the first positioning hole 212 and the second positioning hole 242 through the insertion rod 25.

[0035] It should be noted that the insert rod 25 is simultaneously inserted into the first positioning hole 212 and the second positioning hole 242, tightly connecting the pressure plate 24 and the first mold 21 together. Working in conjunction with the mounting shaft 231, it restricts the movement and rotation of the first mold 21 in all directions, ensuring that the first mold 21 is fixed in position during the pushing of the tube 50, and guaranteeing that the force applied to the tube 50 during the forming process is stable and accurate. The rotational engagement between the bushing 232 and the rotating shaft 241 not only facilitates operation but also ensures that after each rotation of the pressure plate 24, the second positioning hole 242 accurately aligns with the first positioning hole 212, thereby ensuring that the insert rod 25 can be smoothly inserted, achieving precise positioning of the first mold 21, and contributing to improving the forming accuracy and quality of the U-shaped tube.

[0036] The pressure plate 24 is rotatably engaged with the bushing 232 on the mounting bracket 23 via the rotating shaft 241, allowing the pressure plate 24 to rotate freely. When installing the first mold 21, the pressure plate 24 is rotated open, and the first mold 21 is installed on the mounting bracket 23, aligning the mounting hole 211 with the mounting shaft 231. Then, the pressure plate 24 is rotated to the appropriate position, aligning the first positioning hole 212 and the second positioning hole 242, and the insert rod 25 is inserted to complete the fixation. Disassembly is performed in reverse, allowing for quick removal of the first mold 21. This improves the efficiency of changing the first mold 21 and facilitates faster conversion to meet the production needs of U-shaped tubes of different diameters.

[0037] For example, please refer to Figure 5 and Figure 6 The base 10 is provided with a first slide groove 11, which is perpendicular to the pushing direction of the push assembly 20, and the limiting assembly 30 slides in cooperation with the first slide groove 11.

[0038] It should be noted that the required spacing between the two limiting components 30 differs when bending pipes 50 into U-shaped tubes of different diameters. By sliding the limiting components 30 within the first groove 11, the distance between the two limiting components 30 can be flexibly adjusted to accommodate the processing requirements of pipes 50 with different diameters. For pipes 50 with larger diameters, the two limiting components 30 can be slid outwards to increase the spacing; for pipes 50 with smaller diameters, the two limiting components 30 can be slid inwards to decrease the spacing. This allows the pipe bending equipment to process various pipes 50 with different diameters, improving the equipment's versatility and applicability.

[0039] For examples, please refer to Figure 5 The base 10 is provided with a top plate 12; the limiting component 30 includes a telescopic rod 32, a first telescopic drive component 33 and a second mold 31. One end of the telescopic rod 32 abuts against the lower surface of the top plate 12; the first telescopic drive component 33 is slidably disposed in the first slide groove 11 and its output end is connected to the telescopic rod 32; the second mold 31 is rotatably disposed on the telescopic rod 32.

[0040] It should be noted that the first telescopic drive component 33 can be a jack, which can drive the telescopic rod 32 to lift and abut against the lower surface of the top plate 12 for fixation, providing stable support for the second mold 31. During the bending and forming process of the pipe 50, when the pipe 50 contacts the second mold 31 and is pushed by the pushing component 20, the reaction force of the second mold 31 is transmitted to the top plate 12 through the telescopic rod 32. The top plate 12 can withstand and disperse these forces, ensuring that the second mold 31 is stable in position during the bending process of the pipe 50, without shaking or displacement, so that the pipe 50 can be smoothly formed along the preset U-shaped contour when bending, improving the stability and accuracy of the bending and forming of the pipe 50. For pipes 50 of different diameters, the first telescopic drive component 33 slides within the first slide groove 11 to adjust the lateral distance between the two limiting components 30. Then, in conjunction with the telescopic rod 32, it abuts against the top plate 12 to fix the position, so that the second mold 31 and the first mold 21 can better cooperate to form a U-shaped profile suitable for the pipe diameter of the pipe 50. This ensures that the pipe 50 is subjected to uniform and appropriate constraints during the bending and forming process, effectively avoiding quality problems such as surface wrinkles and ellipticization of the pipe 50 caused by improper constraints, and improving the equipment's adaptability to pipes 50 of different diameters and the forming quality of the U-shaped pipe.

[0041] The telescopic rod 32 can retract below the first slide groove 11, separating it from the second mold 31. The second mold 31 can be replaced according to production needs to change its size and adapt to the first mold 21, forming U-shaped profiles with different inner diameters to meet the production needs of U-shaped pipes of different diameters. Both the second mold 31 and the first mold 21 are modularly installed, enabling the pipe bending equipment to process various pipes 50 of different diameters, improving the equipment's versatility and applicability.

[0042] In one possible implementation, please refer to Figure 6 The base 10 is also provided with a second slide groove 13 and a third slide groove 14, and the clamping and positioning component 40 is slidably connected to the second slide groove 13 and the third slide groove 14; the second slide groove 13 is set along the pushing direction of the push component 20 and is located between the two limiting components 30; the third slide groove 14 is perpendicular to the second slide groove 13 and is located at the end of the second slide groove 13 near the push component 20.

[0043] It should be noted that the second slide groove 13 is set along the pushing direction of the hydraulic push rod 22 and is located between the two limiting components 30. The clamping and positioning component 40 is slidably connected to the second slide groove 13 and can move along the direction in which the pipe 50 is pushed, accurately fixing the middle position of the pipe 50. At the same time, the third slide groove 14 is perpendicular to the second slide groove 13 and close to one end of the pushing component 20. In conjunction with the second slide groove 13, the clamping and positioning component 40 can be flexibly adjusted in two mutually perpendicular directions. According to the different lengths of the pipe 50, the middle of the pipe 50 can be accurately positioned and fixed, ensuring that the pipe 50 is always in the right position during the bending and forming process, thereby improving the forming accuracy and quality of the U-shaped tube. Due to the setting of the second slide groove 13 and the third slide groove 14, the clamping and positioning component 40 can be flexibly adjusted within a certain range. For pipes 50 of different lengths and diameters, by sliding the clamping and positioning component 40 within the second slide groove 13 and the third slide groove 14, the processing requirements of various specifications of pipes 50 can be met. For longer pipes 50, the clamping and positioning assembly 40 can be slid away from the pushing assembly 20 on the second slide groove 13 to better fix the middle of the pipe 50. For pipes 50 with different diameters, the position of the clamping and positioning assembly 40 can be finely adjusted to ensure a tight fit with the pipe 50, guaranteeing the stability of the pipe 50 during bending. This improves the versatility and applicability of the equipment, reducing the need to replace equipment or make complex adjustments due to different pipe 50 specifications.

[0044] In some embodiments, please refer to Figure 7 The clamping member 41 includes a first clamping jaw 411 and a second clamping jaw 413. The first clamping jaw 411 is slidably connected to the second sliding groove 13, and a second telescopic drive member 412 is provided on the first clamping jaw 411. The output end of the second telescopic drive member 412 is connected to the second clamping jaw 413.

[0045] It should be noted that the first gripper 411 and the second gripper 413 cooperate to clamp and fix the pipe 50 from both sides. The second telescopic drive component 412 can be a cylinder. By driving the second gripper 413 closer to or further away from the first gripper 411, the clamping force can be flexibly adjusted according to the diameter of the pipe 50, ensuring that the pipe 50 is firmly fixed in the middle and preventing movement or shaking due to insecure fixing during the bending and forming process of the pipe 50, thus ensuring the accuracy and quality of the bending of the pipe 50. The presence of the second telescopic drive component 412 allows the clamping component 41 to adapt to pipes 50 of different diameters. For pipes 50 of different specifications, simply adjusting the position of the second gripper 413 through the second telescopic drive component 412 can make the first gripper 411 and the second gripper 413 fit tightly against the surface of the pipe 50, achieving effective fixing of pipes 50 of different diameters. Improve the equipment's versatility for different pipe materials 50, reduce the hassle of replacing different clamping devices due to changes in pipe material 50 specifications, and lower production costs.

[0046] For example, please refer to Figure 6 The clamping and positioning assembly 40 also includes a positioning structure 42, which has two positioning ends. Both positioning ends are slidably connected to the third slide groove 14. The positioning ends are used to fix the end of the tube 50.

[0047] It should be noted that the two positioning ends can flexibly slide and adjust their positions along the third slide groove 14 according to the length of the pipe 50, thereby precisely fixing the ends of the pipe 50. After the two positioning ends position the pipe 50, the middle of the pipe 50 is clamped by the clamping member 41. At this time, the two positioning ends are separated from the ends of the pipe 50 to avoid affecting the pushing assembly 20 in pushing the pipe 50 for bending operations. Before the pushing assembly 20 pushes the pipe 50 for bending operations, the positioning ends can ensure that the two ends of the pipe 50 are symmetrical about the pushing assembly 20, avoiding bending position deviations caused by end position deviations of the pipe 50, thereby effectively improving the dimensional accuracy of the bent parts at both ends of the U-shaped pipe and reducing the scrap rate.

[0048] For examples, please refer to Figure 8 The positioning structure 42 includes a threaded rod 421, two sliders 422, two bearing members 423, and a rotary drive member 424. The threaded rod 421 is rotatably disposed within the third slide groove 14. The two sliders 422 are both sleeved on the threaded rod 421 and slidably connected to the third slide groove 14. The two sliders 422 are used to move synchronously relative to each other under the drive of the threaded rod 421. The two bearing members 423 are respectively disposed on the two sliders 422 and form positioning ends. The rotary drive member 424 is disposed on the base 10, and its output end is connected to one end of the threaded rod 421.

[0049] It should be noted that the rotary drive component 424 can be a motor. Driving the threaded rod 421 to rotate via the rotary drive component 424 enables position adjustment of the two positioning ends, eliminating the need for manual adjustment of the slider 422, simplifying the operation process and reducing labor intensity. The two bearing components 423 can be precisely adjusted to the appropriate position to fix the ends of the tube 50, ensuring consistency and accuracy in positioning both ends of the tube 50. During the U-tube forming process, this ensures that the two ends of the tube 50 are subjected to uniform force during bending, thereby improving the dimensional accuracy and forming quality of the U-tube and reducing problems such as bending deviation or deformation of the tube 50 caused by inaccurate positioning.

[0050] In one possible implementation, two sliders 422 are located on both sides of the push assembly 20 and have internal threads that are threaded into the threaded rod 421 and rotate in opposite directions.

[0051] It should be noted that when the threaded rod 421 rotates, because the internal threads of the two sliders 422 rotate in opposite directions, the two sliders 422 will move synchronously relative to each other under the drive of the threaded rod 421. This allows the two bearing members 423 mounted on the sliders 422 to move closer or further away simultaneously and symmetrically, thereby accurately positioning both ends of the tube 50. During the U-tube forming process, the constraint and positioning at both ends of the tube 50 are more uniform, ensuring the consistency of the bending at both ends of the tube 50, effectively improving the dimensional accuracy and forming quality of the U-tube, and avoiding problems such as bending deviation of the tube 50 caused by inconsistent positioning at both ends.

[0052] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A U-tube hydraulic forming machine, characterized by The utility model relates to a pipe pushing device, including: A base; A pushing assembly arranged on the base, the pushing assembly having a first die for pushing a pipe; Two limiting assemblies respectively connected to the base and symmetrically distributed on both sides of the first die, the limiting assemblies having second dies rotatably arranged, the two second dies being used to form a U-shaped profile in cooperation with the first die; A clamping and positioning assembly arranged on the base, the clamping and positioning assembly having a clamping piece for fixing a middle part of the pipe, the clamping piece being in sliding cooperation with the base along a pushing direction of the pushing assembly.

2. The U- tube hydroformer as claimed in claim 1, wherein, The pushing assembly includes a hydraulic push rod, a mounting frame, a pressing plate and the first die; the hydraulic push rod is arranged on the base; the mounting frame is connected to a pushing end of the hydraulic push rod, and a mounting shaft is vertically arranged on the mounting frame; the pressing plate is arranged on the mounting frame and located above the first die; the first die is located between the mounting frame and the pressing plate, and a mounting hole is arranged on the first die and in plug-in cooperation with the mounting shaft.

3. The U- tube hydroformer as claimed in claim 2, wherein, A shaft sleeve is transversely arranged on the mounting frame, and a rotating shaft in rotating cooperation with the shaft sleeve is arranged on the pressing plate; a first positioning hole is arranged on the first die, a second positioning hole aligned with the first positioning hole is arranged on the pressing plate, and a plug rod is in plug-in cooperation with the first positioning hole and the second positioning hole.

4. The U- tube hydroformer of claim 1 wherein, A first sliding groove is arranged on the base and perpendicular to the pushing direction of the pushing assembly, and the limiting assemblies are in sliding cooperation with the first sliding groove.

5. The U- tube hydroformer as set forth in claim 4, wherein A top plate is arranged on the base; the limiting assembly includes an extension rod, a first extension driving piece and the second die, one end of the extension rod is abutted against a lower surface of the top plate, the first extension driving piece is slidingly arranged in the first sliding groove and has an output end connected to the extension rod, and the second die is rotatably arranged on the extension rod.

6. The U- tube hydroformer of claim 1 wherein, A second sliding groove and a third sliding groove are further arranged on the base, and the clamping and positioning assembly is in sliding connection with the second sliding groove and the third sliding groove; the second sliding groove is arranged along the pushing direction of the pushing assembly and located between the two limiting assemblies; the third sliding groove is perpendicular to the second sliding groove and located at one end of the second sliding groove close to the pushing assembly.

7. The U- tube hydroformer as set forth in claim 6, wherein The clamping piece includes a first clamping jaw and a second clamping jaw, the first clamping jaw is in sliding connection with the second sliding groove, a second extension driving piece is arranged on the first clamping jaw, and an output end of the second extension driving piece is connected to the second clamping jaw.

8. The U- tube hydroformer as set forth in claim 6 wherein, The clamping and positioning assembly further includes a positioning structure having two positioning ends, the two positioning ends are in sliding connection with the third sliding groove, and the positioning ends are used to fix end parts of the pipe.

9. The U- tube hydroformer as set forth in claim 8 wherein, The positioning structure includes: A threaded rod rotatably arranged in the third sliding groove; Two sliding blocks sleeved on the threaded rod and in sliding connection with the third sliding groove, the two sliding blocks are used to synchronously move relative to each other under the driving of the threaded rod; Two bearing pieces respectively arranged on the two sliding blocks and forming the positioning ends; A rotary driving piece arranged on the base and having an output end connected to one end of the threaded rod.

10. The U- tube hydroformer of claim 9 wherein, Two said sliders are respectively located on both sides of said pusher assembly, and have inner threads threadedly matched with said threaded rod and in opposite rotation directions.

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