A high-precision pipe bending device for multi-directional bending

Abstract

This utility model discloses a high-precision pipe bending device for multi-directional bending, relating to the field of pipe bending technology. It includes a worktable, a pipe bending device, a pipe feeding device, and a control box. This utility model uses closed-loop feedback control of a servo motor and an absolute encoder, combined with a planetary gear transmission device for torque amplification and deceleration, to ensure that the pipe bending shape matches the preset parameters. Furthermore, the ball screw drive of the longitudinal guide rail is linked with the linear motor of the transverse guide rail, ensuring accurate feeding and positioning, and avoiding processing errors caused by pipe offset. A magnetic locking mechanism allows for the replacement of the bending die and bending mold within 5 seconds, adapting to pipes from Φ5mm to Φ50mm. The first and second rotating disks of the clamping jaw device support 360° horizontal rotation and radial rotation of the pipe. Combined with the coordinated positioning of the transverse and longitudinal guide rails, it can achieve complex spatial bending such as S-shaped, U-shaped, and spiral shapes without the need for secondary clamping.

Description

Technical Field

[0001] This utility model relates to the field of pipe bending technology, specifically a high-precision pipe bending device for multi-directional bending. Background Technology

[0002] Pipe bending equipment is widely used in automobile manufacturing, aerospace, furniture processing, and other fields. Its core function is to plastically deform metal or plastic pipes using molds to form a bent structure at a specific angle. Traditional pipe bending equipment typically includes a fixed mold, a hydraulic or mechanical drive mechanism, and a manual feeding device. For example, CN207593229U describes a pipe bending device including a fixed bending mold, a clamping mold, and a rotating bending arm. The fixed bending mold is fixed to one end of the upper part of the rotating bending arm and has an arc-shaped opening on its front side. The clamping mold is located on the other side of the upper part of the rotating bending arm and can slide back and forth on it. The clamping mold has an arc-shaped opening on its rear side corresponding to that of the fixed bending mold. The arc-shaped openings on the fixed bending mold and the clamping mold cooperate to clamp and fix the pipe. When the clamping mold clamps the pipe, a fixing device is used to secure it. The bending die must be immovable. However, traditional equipment uses hydraulic drive or a combination of a regular motor and mechanical transmission, lacking closed-loop feedback control. The bending angle relies on mechanical limits or manual adjustment based on experience, resulting in significant errors. The contact surface between the material and the die is prone to indentation due to friction, and the low matching degree between the die and the curvature of the pipe leads to deformation of the pipe cross-section after bending. Die replacement requires disassembling bolts or manual calibration, which is time-consuming and complex, making it difficult to quickly switch between processing different pipe specifications. The die surface lacks wear resistance and is prone to wear after long-term use, further exacerbating the problem of decreased accuracy. Existing equipment mostly uses fixed clamping devices, supporting bending actions only in a single plane. Complex spatial angles require multiple clamping or manual adjustment of the pipe direction, resulting in low processing efficiency and significant cumulative errors. The equipment lacks rigidity, and vibration during processing can easily cause positioning deviations, especially noticeable during high-torque bending or high-speed operation. To address these issues, a new type of pipe bending equipment is urgently needed. Utility Model Content

[0003] The purpose of this invention is to provide a high-precision pipe bending device for multi-directional bending, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a high-precision pipe bending device for multi-directional bending, comprising: a worktable, the worktable including a work panel and a support frame, a pipe bending device and a pipe feeding device fixedly connected to the work panel, a control box at the bottom of the work panel, the pipe bending device including a symmetrically arranged fixed end and a movable end, the fixed end being fixed to the work panel and having a bending mold base at the top, the movable end having a built-in servo motor and planetary gear transmission device, and having a bending mold at the top, the movable end being connected to the work panel via a bending slide rail, the pipe feeding device including a longitudinal guide rail, a transverse guide rail and a clamping jaw device, the top of the longitudinal guide rail having a movable slider driven by a ball screw, the transverse guide rail device being located at the top of the movable slider of the longitudinal guide rail, the transverse guide rail including a linear drive motor, the control box including a PLC controller and a touch screen, the PLC controller being electrically connected to the pipe bending device and the pipe feeding device.

[0005] Furthermore, the bending mold base and bending mold are plated with hard chrome, and can be quickly replaced by a magnetic locking mechanism.

[0006] Furthermore, the bending mold base and the bending mold surface are arc-shaped groove structures, and the radius of curvature of the arc-shaped groove matches the diameter of the pipe, with the suitable pipe diameter range being Φ5mm to Φ50mm.

[0007] Furthermore, the planetary gear transmission device includes a coupling and a reduction gear set. The output shaft of the servo motor is coupled to the input shaft of the gearbox through the coupling, and the output end of the gearbox is fixedly connected to the rotating shaft of the bending mold.

[0008] Furthermore, the servo motor output shaft is equipped with an absolute encoder at its end, and the absolute encoder is coaxially connected to the planetary gear transmission device.

[0009] Furthermore, the clamping gripper device includes a first rotating disk connected to the transverse guide rail. The first rotating disk is a horizontal rotating disk that supports 360° continuous rotation. A second rotating disk is provided on the top of the first rotating disk, and a pneumatic gripper is connected to the front end of the second rotating disk.

[0010] Furthermore, the pneumatic gripper has a symmetrical double V-shaped structure, and the inner sides of the two gripping arms are provided with anti-slip textures.

[0011] Furthermore, the curved slide rail is an arc-shaped guide rail structure, embedded in the surface of the working panel, with the radius of curvature of the arc surface matching the axial rotation range of the movable end, and the maximum rotation angle being ±90°.

[0012] Furthermore, the PLC controller of the control box is electrically connected to the servo motor, the linear drive motor, the pneumatic gripper, the first rotary disk, and the second rotary disk.

[0013] Furthermore, the support frame is equipped with shock-absorbing feet at the bottom, adopts a high-strength alloy frame structure, and has pre-drilled bolt holes on the surface.

[0014] Compared with existing technologies, the advantages of this utility model are as follows: This utility model utilizes closed-loop feedback control of a servo motor and an absolute encoder, combined with a planetary gear transmission device for torque amplification and deceleration, ensuring a bending angle error of ≤0.5° and guaranteeing that the pipe bending shape matches the preset parameters. Furthermore, the ball screw drive of the longitudinal guide rail is linked with the linear motor of the transverse guide rail, achieving a feeding positioning accuracy of ±0.1mm, avoiding processing errors caused by pipe offset. A magnetic locking mechanism enables the bending die holder and bending mold to be replaced within 5 seconds, adapting to pipes from Φ5mm to Φ50mm, significantly shortening downtime and improving the efficiency of multi-specification production switching. The mold surface is hard chrome plated, increasing wear resistance by 50%, reducing surface damage caused by friction, and lowering costs. To reduce maintenance costs, the first and second rotating disks of the clamping jaw device support 360° horizontal rotation and radial rotation of the pipe. Combined with the coordinated positioning of the transverse and longitudinal guide rails, it can achieve complex spatial bending such as S-shaped, U-shaped, and spiral shapes without secondary clamping. The PLC controller automatically generates multi-axis linkage trajectory according to preset parameters and synchronously controls the servo motor, rotating disk, and guide rail movements to ensure the continuity and accuracy of complex bending paths. Finally, the shock-absorbing feet and high-strength alloy frame structure of the support frame can absorb more than 80% of the vibration energy during processing, prevent positioning deviation caused by resonance, and ensure long-term processing stability. It is fixed to the ground by the reserved bolt holes at the bottom to avoid equipment displacement and is suitable for high-speed continuous production environments. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a front view of the working state of the active end of this utility model;

[0017] Figure 3 This is a top view of the present invention;

[0018] Figure 4 This is a top view of the fixed end and the movable end of this utility model;

[0019] Figure 5 This is a schematic diagram of the movable end structure of this utility model;

[0020] Figure 6 This is a schematic diagram of the clamping claw device of this utility model;

[0021] In the diagram: 1. Workbench, 2. Pipe bending device, 3. Pipe feeding device, 4. Control box, 101. Work panel, 102. Support frame, 201. Fixed end, 2011. Bending mold base, 202. Movable end, 2021. Servo motor, 2022. Planetary gear transmission device, 2023. Bending mold, 203. Bending slide rail, 301. Longitudinal guide rail, 302. Transverse guide rail, 3021. Linear drive motor, 303. Clamping gripper device, 3031. First rotating disk, 3032. Second rotating disk, 3033. Pneumatic gripper. Detailed Implementation

[0022] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings and specific embodiments.

[0023] Please refer to Figure 1-6 This utility model provides a high-precision pipe bending device for multi-directional bending, comprising: a workbench 1, the workbench 1 including a work panel 101 and a support frame 102, a pipe bending device 2 and a pipe feeding device 3 fixedly connected to the work panel 101, a control box 4 provided at the bottom of the work panel 101, the pipe bending device 2 including a fixed end 201 and a movable end 202 symmetrically arranged, the fixed end 201 being fixed to the work panel 101, a bending die base 2011 provided at the top, and the movable end 202 having a built-in servo motor 2021 and a planetary gear transmission device 2022, the top... A bending die 2023 is provided. The movable end 202 is connected to the working panel 101 through a bending slide rail 203. The pipe feeding device 3 includes a longitudinal guide rail 301, a transverse guide rail 302, and a clamping claw device 303. The top of the longitudinal guide rail 301 is provided with a movable slider, which is driven by a ball screw. The transverse guide rail device 302 is located on top of the movable slider of the longitudinal guide rail 301. The transverse guide rail 302 includes a linear drive motor 3021. The control box 4 includes a PLC controller and a touch screen. The PLC controller is electrically connected to the pipe bending device 2 and the pipe feeding device 3.

[0024] The work panel 101 serves as the basic platform for the equipment, fixing the bending device 2 and the feeding device 3, providing a stable processing reference surface. The support frame 102 supports the entire equipment through a high-strength alloy frame to prevent vibration from affecting accuracy. The fixed end 201 fixes the bending die base 2011 as the reference point for pipe bending. The movable end 202 has a built-in servo motor 2021 that drives the planetary gear transmission device 2022, which drives the bending die 2023 to rotate, realizing dynamic bending. The bending slide rail 204 guides the movable end to move along the arc trajectory, ensuring precise control of the bending angle. The longitudinal guide rail 301 drives the pipe to feed axially through a ball screw, ensuring the accuracy of the feeding position. The transverse guide rail 302 adjusts the horizontal position of the pipe through a linear drive motor 3021 to adapt to the needs of multi-station bending. The clamping jaw device 303 clamps and adjusts the angle of the pipe, supporting multi-directional bending operations. The PLC controller coordinates the actions of the servo motor, drive motor, and clamp to realize a fully automated process. The touch screen provides a human-machine interface for setting parameters and monitoring the operating status.

[0025] The bending die holder 2011 and bending die 2023 are plated with hard chrome to enhance the surface hardness and wear resistance of the die, reduce friction damage to the pipe, reduce maintenance frequency, and quickly adsorb the die by magnetic force without bolt fixation, shortening the die change time to within 5 seconds, improving equipment flexibility, and adapting to the production of multiple specifications of pipes.

[0026] The bending die holder 2011 and bending die 2023 have an arc-shaped groove structure on their surfaces. The radius of curvature of the arc-shaped groove matches the diameter of the pipe, and the pipe diameter range is Φ5mm to Φ50mm. The curvature of the arc-shaped groove matches the pipe diameter to ensure that the pipe is subjected to uniform force during bending, avoid flattening or wrinkling, reduce pipe deformation, ensure smooth arc transition, adapt to different pipe diameters, and expand the application scenarios of the equipment.

[0027] The planetary gear transmission device 2022 includes a coupling and a reduction gear set. The output shaft of the servo motor 2021 is coupled to the input shaft of the gearbox through the coupling. The output end of the gearbox is fixedly connected to the rotating shaft of the bending mold 2023.

[0028] The coupling connects the servo motor 2021 to the gearbox to transmit torque, while the reduction gear set reduces the motor speed and increases the output torque, ensuring the driving force for large-diameter pipe bending.

[0029] The servo motor 2021 has an absolute encoder at the end of its output shaft, and the absolute encoder is coaxially connected to the planetary gear transmission device 2022.

[0030] The absolute encoder monitors the rotation angle of the servo motor 2021 in real time and feeds it back to the PLC controller to form a closed-loop control, reducing the bending angle, avoiding repeated corrections, and can be adjusted in real time during the bending process to improve consistency.

[0031] The clamping gripper device 303 includes a first rotating disk 3031 connected to the transverse guide rail 302. The first rotating disk 3031 is a horizontal rotating disk that supports 360° continuous rotation. A second rotating disk 3032 is provided on the top of the first rotating disk 3031. A pneumatic gripper 3033 is connected to the front end of the second rotating disk 3032.

[0032] The first rotating disk 3031 has a horizontal rotating jaw to adjust the horizontal angle of the pipe, and the second rotating disk 3032 has a radial rotating jaw to make the pipe rotate radially.

[0033] The pneumatic gripper 3033 has a symmetrical double V-shaped structure with two gripping arms that open and close symmetrically to adapt to different pipe diameters. The gripping center is automatically aligned, and the inner sides of the two gripping arms are provided with anti-slip textures to increase the friction between the gripper and the pipe contact surface and prevent slippage. The pneumatic drive provides stable pressure to prevent processing deviation.

[0034] The curved slide rail 203 is an arc-shaped guide rail structure, embedded in the surface of the working panel 101. The radius of curvature of the arc surface matches the axial rotation range of the movable end 2, and the maximum rotation angle is ±90°.

[0035] The curved slide rail 203 guides the movable end 202 to move along a preset arc trajectory, with a maximum rotation angle of ±90°, ensuring that the bending angle is consistent with the preset parameters, and supporting right-angle bending and compound angle processing.

[0036] The PLC controller of the control box 4 is electrically connected to the servo motor 2021, the linear drive motor 3021, the pneumatic gripper 3033, the first rotary disk 3031, and the second rotary disk 3032.

[0037] The support frame 102 is equipped with shock-absorbing feet at the bottom, adopts a high-strength alloy frame structure, and has pre-drilled bolt holes on the surface.

[0038] When using this invention, the pneumatic gripper 3033 first clamps the pipe using a symmetrical double V-shaped structure and anti-slip texture to ensure stability. The transverse guide rail 302 is driven by a linear drive motor 3021 to adjust the horizontal position of the pipe. The longitudinal guide rail 301 is driven by a ball screw to move the slider, sending the pipe to the bending station. The first rotary disk 3031 controls the horizontal angle of the pneumatic gripper 3033, supporting 360° continuous rotation. The second rotary disk 3032 controls the radial rotation of the pneumatic gripper 3033 to achieve multi-directional bending preparation. A matching bending setting is selected based on the pipe diameter (Φ5mm-Φ50mm). The die holder 2011 and bending die 2023 are equipped with an absolute encoder on the output shaft of the servo motor to monitor the rotation angle in real time, ensuring a bending angle accuracy of ±0.1°. The movable end moves along the bending slide rail 204, with a maximum rotation angle of ±90°, realizing multi-directional bending. The PLC controller synchronously controls the servo motor, linear drive motor and rotary disk to coordinate the tube feeding and bending actions. After a single bend, the clamping jaw device 303 adjusts the tube angle through the rotary disk and repositions it with the horizontal and vertical guide rails for the next bending operation. It supports multiple bends of complex shapes such as S-shaped and U-shaped without manual intervention. Operators input parameters such as pipe diameter, bending angle, and number of bends via a touchscreen. The PLC automatically generates the motion trajectory. The PLC controller receives signals from various sensor encoders and position sensors, dynamically adjusting the motor speed and stroke to ensure consistent processing. The high-strength alloy frame and shock-absorbing structure at the bottom of support frame 102 absorb processing vibrations, ensuring high-precision operation. The equipment is fixed to the ground through pre-drilled holes to prevent displacement. The bending mold base and mold surface are plated with hard chrome to reduce wear and extend service life. The planetary gear transmission device and guide rails require regular lubrication to ensure smooth transmission.

[0039] Although embodiments of the present invention have been shown and described, it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, it will be understood by those skilled in the art that all other embodiments obtained by making various changes, modifications, substitutions and alterations to these embodiments without departing from the principles and spirit of the present invention and without creative effort are within the scope of protection of the present invention.

Claims

1. A high-precision pipe bending device for multi-directional bending, comprising: A workbench (1) includes a work panel (101) and a support frame (102). A pipe bending device (2) and a pipe feeding device (3) are fixedly connected to the work panel (101). A control box (4) is provided at the bottom of the work panel (101). The pipe bending device (2) includes a fixed end (201) and a movable end (202) arranged symmetrically. The fixed end (201) is fixed on the work panel (101) and a bending mold base (2011) is provided at the top. The movable end (202) has a built-in servo motor (2021) and a planetary gear transmission device (2022). A bending mold is provided at the top. 2023), the active end (202) is connected to the working panel (101) through the bending slide rail (203), the pipe feeding device (3) includes a longitudinal guide rail (301), a transverse guide rail (302) and a clamping claw device (303), the top of the longitudinal guide rail (301) is provided with a movable slider, which is driven by a ball screw, the transverse guide rail (302) is located on the top of the movable slider of the longitudinal guide rail (301), the transverse guide rail (302) includes a linear drive motor (3021), the control box (4) includes a PLC controller and a touch screen, the PLC controller is electrically connected to the pipe bending device (2) and the pipe feeding device (3).

2. The high-precision pipe bending equipment for multi-directional bending according to claim 1, characterized in that, The bending die holder (2011) and bending die (2023) are plated with hard chrome and can be quickly replaced by a magnetic locking mechanism.

3. The high-precision pipe bending equipment for multi-directional bending according to claim 2, characterized in that, The bending die holder (2011) and bending die (2023) have an arc-shaped groove structure on their surfaces. The radius of curvature of the arc-shaped groove matches the diameter of the pipe, and the pipe diameter range is Φ5mm to Φ50mm.

4. The high-precision pipe bending equipment for multi-directional bending according to claim 1, characterized in that, The planetary gear transmission device (2022) includes a coupling and a reduction gear set. The output shaft of the servo motor (2021) is coupled to the input shaft of the gearbox through the coupling. The output end of the gearbox is fixedly connected to the rotating shaft of the bending mold (2023).

5. The high-precision pipe bending equipment for multi-directional bending according to claim 4, characterized in that, The servo motor (2021) has an absolute encoder at the end of its output shaft, and the absolute encoder is coaxially connected to the planetary gear transmission device (2022).

6. The high-precision pipe bending equipment for multi-directional bending according to claim 1, characterized in that, The clamping gripper device (303) includes a first rotating disk (3031) connected to the transverse guide rail (302). The first rotating disk (3031) is a horizontal rotating disk that supports 360° continuous rotation. A second rotating disk (3032) is provided on the top of the first rotating disk (3031), and a pneumatic gripper (3033) is connected to the front end of the second rotating disk (3032).

7. The high-precision pipe bending equipment for multi-directional bending according to claim 6, characterized in that, The pneumatic gripper (3033) has a symmetrical double V-shaped structure, and the inner sides of the two gripping arms are provided with anti-slip texture.

8. The high-precision pipe bending equipment for multi-directional bending according to claim 1, characterized in that, The curved slide rail (203) is an arc-shaped guide rail structure, embedded in the surface of the working panel (101). The radius of curvature of the arc surface matches the axial rotation range of the movable end (202), and the maximum rotation angle is ±90°.

9. The high-precision pipe bending equipment for multi-directional bending according to claim 6, characterized in that, The PLC controller of the control box (4) is electrically connected to the servo motor (2021), the linear drive motor (3021), the pneumatic gripper (3033), the first rotary disk (3031), and the second rotary disk (3032).

10. The high-precision pipe bending equipment for multi-directional bending according to claim 9, characterized in that, The support frame (102) is equipped with shock-absorbing feet at the bottom, adopts a high-strength alloy frame structure, and has pre-drilled bolt holes on the surface.

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