A bending angle on-line detection device for a pipe bending machine

Abstract

The application discloses a bending angle on-line detection device for a pipe bending machine, which comprises a chassis, a pushing assembly, a cleaning assembly, a bending assembly and a bending detection system are arranged on the top of the chassis, and the bending condition of a pipe rod is judged according to the bending detection system during bending; the bending assembly comprises a mounting frame fixed to one side of the chassis, a first telescopic rod fixed to the bottom of the chassis and a limiting table fixed to the chassis, a sliding seat is slidably connected to the top of the limiting table, a second telescopic motor is fixed to one end of the sliding seat, the second telescopic motor is fixed to the chassis, a limiting block one is fixed to one end of the sliding seat close to a push rod, an arc surface one is formed in one side of the limiting block one close to the push rod, the arc surface one is matched with the surface of the push rod, and a plurality of pressure sensors are fixed in the arc surface one, and the production efficiency of the bent pipe is improved.

Description

Technical Field

[0001] This invention relates to the field of pipe bending technology, specifically to an online detection device for bending angle of a pipe bending machine. Background Technology

[0002] Pipe bending is a key process in modern manufacturing, widely used in automotive exhaust systems, aerospace hydraulic lines, furniture frames, fitness equipment, and many other industries. One of the core quality indicators for pipe bending is the accuracy of the bending angle. This is because the pipe will inevitably undergo elastic recovery after being bent and unloaded.

[0003] In existing technologies, the inspection of pipe bending angles is mostly performed offline after the bending process is completed, which has a significant time lag. Once an angle deviation is detected, the workpiece is often beyond repair, leading to material scrap and reduced production efficiency. This phenomenon has become a problem that urgently needs to be solved by those in the field. Summary of the Invention

[0004] The purpose of this invention is to provide an online bending angle detection device for a pipe bending machine to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an online bending angle detection device for a pipe bending machine, including a base frame, the top of which is provided with a pushing component, a cleaning component, a bending component and a bending detection system. Before bending, the positioning rod on the pushing component is cleaned by the cleaning component. After cleaning, the pipe is bent by the cooperation of the pushing component and the bending component. During bending, the bending condition of the pipe is judged by the bending detection system.

[0006] The bending assembly includes a mounting bracket fixed to one side of the base frame, a first telescopic rod fixed to the bottom of the base frame, and a limiting platform fixed to the base frame. A sliding seat is slidably connected to the top of the limiting platform. A second telescopic motor is fixed to one end of the sliding seat and is fixed to the base frame. A limiting block is fixed to one end of the sliding seat near the push rod. An arc surface is formed on one side of the limiting block near the push rod. The arc surface is adapted to the surface of the push rod. Several pressure sensors are fixed inside the arc surface.

[0007] The cleaning assembly includes a storage box and a fixing sleeve that are slidably connected to the base frame. The storage box is filled with lubricating oil, and a cylinder is fixed to the top of the storage box. A top ring is fixed to the output end of the cylinder.

[0008] According to the above technical solution, the mounting frame is a hollow structure, the output end of the first telescopic rod is fixed with a rack, and a gear is connected to one end of the hollow part inside the mounting frame by a bearing, and the gear meshes with the rack.

[0009] According to the above technical solution, the top bearing of the mounting frame is connected to a support plate, the top of the support plate is provided with a bearing platform, the top of the bearing platform is provided with a shaping block, the side of the shaping block is provided with an arc surface two, the arc surface two is adapted to the tube rod, the middle of the support plate is fixed between the support plate and the mounting frame, the mounting shaft extends into the interior of the gear and is fixed to the gear, the mounting shaft is fixedly connected to the bearing platform and the shaping block, a third telescopic motor is fixed to one side of the bearing platform, a push block is fixed to the output end of the third telescopic motor, a limit block two is fixed to the side of the push block near the push rod, and the side of the limit block two near the push rod is provided with an arc surface three.

[0010] According to the above technical solution, a long plate is fixed to the top of the mounting shaft, and a vision unit is fixed to the bottom of the long plate for capturing the bending angle of the pipe.

[0011] According to the above technical solution, the fixing sleeve is fixed on the push rod, and a sleeve is fixed on the side of the fixing sleeve away from the storage box. Both the fixing sleeve and the sleeve are hollow structures and penetrate each other. Cleaning cotton is provided on both the upper and lower sides of the sleeve. Several oil outlet holes are opened on the upper part of the sleeve. The oil outlet holes are used to connect the inside and outside of the sleeve. Two sets of cleaning cotton are provided inside the sleeve.

[0012] According to the above technical solution, an oil pipe is connected between the fixed sleeve and the storage tank, and an oil pump is fixedly connected to the oil pipe.

[0013] According to the above technical solution, a mounting plate is fixed on the side of the fixed sleeve near the storage box. The mounting plate and the push rod are slidably connected. A second cylinder is fixed above the storage box. The output end of the second cylinder is fixedly connected to the mounting plate.

[0014] According to the above technical solution, the pushing component includes a base fixed on the base frame and a support tube fixed on one side of the base frame. A first telescopic motor is fixed on one side of the base frame, and a push rod is fixed at the output end of the first telescopic motor. A positioning rod is fixed at the end of the push rod near the bending component.

[0015] According to the above technical solution, the support tube is located below the push rod, and the support tube is bent.

[0016] According to the above technical solution, the bending detection system includes an angle analysis module and an adjustment module. The angle analysis module is electrically connected to the vision unit and the pressure sensor, and the adjustment module is electrically connected to cylinder two and cylinder one.

[0017] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: The present invention, by setting a bending component, when the detected pressure is increasing or decreasing within an allowable range, continues the subsequent bending action. At this time, the signal is transmitted to the adjustment module, which can adjust the theoretical angle value, thus overcoming the problem of obvious lag in the detection of bending angle in the prior art and improving the efficiency of bending pipe. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0021] Figure 3 This is the present invention. Figure 1 A magnified view of a portion of region A;

[0022] Figure 4 This is the present invention. Figure 2 A magnified view of a portion of region B;

[0023] Figure 5 This is the present invention. Figure 1 A magnified view of a portion of region C;

[0024] Figure 6 This is a two-dimensional cross-sectional schematic diagram of the limiting block of the present invention;

[0025] Figure 7 This is a two-dimensional schematic diagram of the cleaning component of the present invention;

[0026] In the diagram: 1. Base frame; 2. Support tube; 3. Base; 4. First telescopic motor; 5. Push rod; 6. First telescopic rod; 7. Third telescopic motor; 8. Second telescopic motor; 9. Support platform; 10. Push block; 11. Limiting block two; 12. Sliding seat; 13. Limiting block one; 14. Positioning rod; 15. Limiting platform; 16. Cleaning cotton two; 17. Cleaning cotton one; 18. Shaping block; 19. Support plate; 20. Mounting shaft; 21. Long plate; 22. Gear; 23. Mounting bracket; 24. Rack; 25. Storage box; 26. Cylinder one; 27. Cylinder two; 28. Top ring; 29. ​​Oil pipe; 30. Oil pump; 31. Mounting plate; 32. Fixing sleeve; 33. Sleeve; 34. Arc surface one; 35. Pressure sensor; 36. Oil outlet. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Please see Figure 1-7 The present invention provides a technical solution: an online bending angle detection device for a pipe bending machine, including a base frame 1. The top of the base frame 1 is provided with a pushing component, a cleaning component, a bending component and a bending detection system. Before bending, the positioning rod 14 on the pushing component is cleaned by the cleaning component. After cleaning, the pipe is bent by the cooperation of the pushing component and the bending component. During bending, the bending condition of the pipe is judged by the bending detection system.

[0029] The pushing component includes a base 3 fixed on the base frame 1 and a support tube 2 fixed on one side of the base frame 1. One side of the base 3 is fixed to a first telescopic motor 4. A push rod 5 is fixed to the output end of the first telescopic motor 4. A positioning rod 14 is fixed to the end of the push rod 5 near the bending component. The positioning rod 14 is made of high-precision material. Starting the first telescopic motor 4 can push the push rod 5 to move towards the bending component, extending the positioning rod 14 into the tube, and achieving bending in cooperation with the bending component.

[0030] It should be added that the support tube 2 is located below the push rod 5, and the support tube 2 is bent.

[0031] The bending assembly includes a mounting bracket 23 fixed to one side of the base frame 1, a first telescopic rod 6 fixed to the bottom of the base frame 1, and a limiting platform 15 fixed to the base frame 1. A sliding seat 12 is slidably connected to the top of the limiting platform 15. A second telescopic motor 8 is fixed to one end of the sliding seat 12 and is fixed to the base frame 1. A limiting block 13 is fixed to one end of the sliding seat 12 near the push rod 5. An arc surface 34 is formed on the side of the limiting block 13 near the push rod 5. The arc surface 34 is adapted to the surface of the push rod 5. Several pressure sensors 35 are fixed inside the arc surface 34 (e.g., ...). Figure 6 (As shown).

[0032] The mounting bracket 23 has a hollow structure. A rack 24 is fixed to the output end of the first telescopic rod 6. A gear 22 is connected to a bearing at one end of the hollow part inside the mounting bracket 23. The gear 22 meshes with the rack 24. Activating the first telescopic rod 6 drives the rack 24 to move, thereby controlling the rotation of the gear 22.

[0033] The top bearing of the mounting bracket 23 is connected to a support plate 19. A support platform 9 is provided on the top of the support plate 19, and a shaping block 18 is provided on the top of the support platform 9. The side of the shaping block 18 has a second arc surface, which is adapted to the tube rod. A mounting shaft 20 is fixed between the middle of the support plate 19 and the mounting bracket 23. The mounting shaft 20 extends into the interior of the gear 22 and is fixed to the gear 22. The mounting shaft 20 is fixedly connected to the support platform 9 and the shaping block 18. A third telescopic motor 7 is fixed to one side of the support platform 9. A push block 10 is fixed to the output end of the third telescopic motor 7. A limit block 11 is fixed to the side of the push block 10 near the push rod 5. A third arc surface is provided on the side of the limit block 11 near the push rod 5.

[0034] A long plate 21 is fixed to the top of the mounting shaft 20, and a vision unit is fixed to the bottom of the long plate 21 for capturing the bending angle of the pipe.

[0035] When the tube needs to be bent, the tube is placed on the support platform 9 and aligned with the arc surface 2 on the shaping block 18. The push rod 5 is pushed to move closer to the tube, and the positioning rod 14 is inserted into the center of the tube. The second telescopic motor 8 and the third telescopic motor 7 are started simultaneously, pushing the first limiting block 13 and the second limiting block 11. The first limiting block 13 contacts the surface of the push rod 5, while the second limiting block 11 contacts the surface of the tube and slightly squeezes the tube. At the same time, the first telescopic rod 6 is extended, controlling the gear 22 to rotate, thereby driving the mounting shaft 20 to rotate, which in turn drives the support platform 9 to rotate outward. Since the third telescopic motor 7 is fixed on the support platform 9, it will rotate synchronously, causing the angles of the first limiting block 13 and the second limiting block 11 to change, bending the tube around the shaping block 18 to form a bent tube.

[0036] It should be added that during the bending process of the tube bar, the first telescopic motor 4 synchronously pushes the positioning rod 14 to move closer to the bending assembly, thereby pushing the tube bar to avoid the tube bar being stretched and deformed at the bending point, which would affect the bending quality.

[0037] The cleaning assembly includes a storage box 25 and a fixing sleeve 32 that are slidably connected to the base frame 1. The storage box 25 is filled with lubricating oil. A cylinder 26 is fixed to the top of the storage box 25. A top ring 28 is fixed to the output end of the cylinder 26. The top ring 28 is semi-circular and adapted to the push rod 5 to support the push rod 5.

[0038] The fixing sleeve 32 is fixed to the push rod 5. A sleeve 33 is fixed to the side of the fixing sleeve 32 away from the storage box 25. Both the fixing sleeve 32 and the sleeve 33 are hollow structures and penetrate each other. Cleaning cotton 17 is provided on both the upper and lower sides of the sleeve 33. Several oil outlet holes 36 are opened on the upper part of the sleeve 33 to connect the inside and outside of the sleeve 33. Two sets of cleaning cotton 16 are provided inside the sleeve 33.

[0039] The cleaning cotton is secured with Velcro.

[0040] An oil pipe 29 is connected between the fixed sleeve 32 and the storage tank 25. An oil pump 30 is fixedly connected to the oil pipe 29. When the oil pump 30 is started, the lubricating oil inside the storage tank 25 is pumped into the fixed sleeve 32 and then flows into the sleeve 33. The oil is then distributed to the inner and outer sides of the sleeve 33 through the oil outlet 36, and the lubricating oil flows to the outer surface of the push rod 5 and the inner surface of the tube rod, respectively.

[0041] A mounting plate 31 is fixed to the side of the fixed sleeve 32 near the storage box 25. The mounting plate 31 is slidably connected to the push rod 5. A cylinder 27 is fixed above the storage box 25. The output end of the cylinder 27 is fixedly connected to the mounting plate 31.

[0042] Before bending the tube bar, the surfaces of positioning rod 14, arc surface 34, arc surface 2, and arc surface 3 need to be cleaned to avoid impurities on the surface of positioning rod 14 that could cause indentations. Therefore, first, control arc surface 34, arc surface 2, and arc surface 3 to contact the surface of cleaning cotton 17, and then control cylinder 27 to extend and retract, thereby driving the fixed sleeve 32 to move along the axis of push rod 5, which in turn causes the cleaning cotton 17 on the outer surface of sleeve 33 to move back and forth on arc surface 34, arc surface 2, and arc surface 3. Combined with lubricating oil, the surfaces of arc surface 34, arc surface 2, and arc surface 3 can be cleaned to remove surface impurities.

[0043] While cleaning the impurities on the surfaces of arc surface 1, arc surface 2, and arc surface 3, the cleaning cotton 2 16 inside the sleeve 33 comes into contact with the surface of the positioning rod 14, simultaneously removing the impurities from its surface.

[0044] After the above cleaning process is completed, the tube is placed on the support platform 9, and the cylinder 27 is extended to make the cleaning cotton 17 contact the inner surface of the tube to remove impurities from the inner surface of the tube.

[0045] Through the above process, impurities are removed from the inner wall of the tube and the arc surfaces 34, 2, and 3, ensuring that there are no impurities on the contact surfaces between the tube and the arc surfaces 34, 2, and 3, thus improving the bending quality. Example:

[0046] In this embodiment, the bending angle of the tube needs to be detected during bending to further ensure bending quality and reduce scrap rate.

[0047] Preferably, the bending detection system includes an angle analysis module and an adjustment module. The angle analysis module is electrically connected to the vision unit and the pressure sensor 35, and the adjustment module is electrically connected to cylinder 27 and cylinder 26.

[0048] Before bending, the adjustment module controls the retraction of cylinder 27, causing the cleaning component to retract, facilitating contact between limit block 13 and push rod 5. During the bending process, limit block 13 contacts the surface of push rod 5, and limit block 21 contacts the tube. Therefore, pressure sensor 35 on limit block 13 detects the pressure between push rod 5 and limit block 13 and transmits it to the angle analysis module. The angle analysis module sets a constant pressure between pressure sensor 35 and push rod 5, and then sets the theoretical angle for tube bending.

[0049] Furthermore, when the pressure of several pressure sensors 35 is detected to be equal to the set constant pressure, it indicates that the push rod 5 has not tilted during the bending process. At this time, the bending angle of the tube is captured by the vision unit and the signal is transmitted to the angle analysis module for comparison with the theoretical angle. When the tube is bent to the theoretical angle, the bending is paused, and the limit block 11 is moved away from the bent tube. The bent tube is then left to stand for a period of time, and the vision unit continues to capture the bending angle of the tube and transmits it to the angle analysis module for comparison with the theoretical angle. When the actual bending angle is consistent with the theoretical bending angle, it indicates that there is no springback phenomenon after the tube is bent, and it can be unloaded. When the bending angle is inconsistent with the theoretical angle, it indicates that there is a springback phenomenon after the tube is bent, and the bent tube is marked by the angle analysis module.

[0050] If the pressure value detected by pressure sensor 35 during bending is not equal to the set constant pressure, and the pressure detected by pressure sensors 35 that are close to each other shows an increasing or decreasing trend, it indicates that impurities between the tube and the positioning rod 14 have not been completely cleaned, causing the push rod 5 to tilt during bending. When the detected pressure is within the allowable range of increasing or decreasing, it proves that the amount of internal impurities is small and does not affect the overall quality of the tube, and subsequent bending operations can continue. Because incomplete cleaning will lead to uneven distribution of thermal stress during bending, it will cause springback. At this time, the signal is transmitted to the adjustment module, which can adjust the theoretical angle value, for example, adjusting the theoretical angle from 90° to 92° to compensate for springback and improve bending quality.

[0051] The above steps overcome the problem of significant lag in the detection of bending angle in existing technologies, thereby improving the efficiency of pipe bending.

[0052] Furthermore, during the subsequent bending process, the vision unit monitors the bending angle in real time and dynamically adjusts the working status of the push assembly, bending assembly, and top ring 28 according to pressure changes to ensure bending quality. The top ring 28 is used to support the push rod 5, preventing the push rod 5 from being offset in the upper and lower positions and reducing the bending of the space during tube bending.

[0053] It should be noted that this compensation value is calculated by the system in the adjustment module, which will not be elaborated on further.

[0054] When the test pressure increases or decreases but is outside the allowable range, it indicates a high level of internal impurities, requiring re-cleaning. During cleaning, more lubricating oil should be pumped in to enhance the cleaning process. After cleaning, control cylinder 26 extends so that the top ring 28 contacts the surface of push rod 5, holding push rod 5 in place and limiting its position to prevent displacement from affecting the bending angle.

[0055] If the pressure value detected by the pressure sensor 35 during bending is not equal to the set constant pressure, and the pressure detected by the pressure sensors 35 that are close to each other does not increase or decrease, it proves that the surface of the push rod 5 is not clean. At this time, it is necessary to replace the cleaning cotton with new cleaning cotton to clean the impurities again.

[0056] It should be added that the increasing or decreasing direction described above starts with the direction closer to limit block 2 11 and ends with the direction closer to limit block 1 13.

[0057] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0058] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An online bending angle detection device for a pipe bending machine, comprising a base frame (1), characterized in that: The top of the base frame (1) is provided with a pushing component, a cleaning component, a bending component and a bending detection system; The bending assembly includes a mounting bracket (23) fixed to one side of the base frame (1), a first telescopic rod (6) fixed to the bottom of the base frame (1), and a limiting platform (15) fixed to the base frame (1). A sliding seat (12) is slidably connected to the top of the limiting platform (15). A second telescopic motor (8) is fixed to one end of the sliding seat (12). The second telescopic motor (8) is fixed to the base frame (1). A limiting block (13) is fixed to one end of the sliding seat (12). An arc surface (34) is opened on one side of the limiting block (13). Several pressure sensors (35) are fixed inside the arc surface (34). The cleaning assembly includes a storage box (25) and a fixing sleeve (32) slidably connected to the base frame (1). The storage box (25) is filled with lubricating oil. A cylinder (26) is fixed to the top of the storage box (25). A top ring (28) is fixed to the output end of the cylinder (26). The mounting frame (23) is a hollow structure. A rack (24) is fixed to the output end of the first telescopic rod (6). A gear (22) is connected to one end of the hollow part inside the mounting frame (23) by a bearing. The gear (22) meshes with the rack (24). The top bearing of the mounting frame (23) is connected to a support plate (19). The top of the support plate (19) is provided with a bearing platform (9). The top of the bearing platform (9) is provided with a shaping block (18). The side of the shaping block (18) is provided with an arc surface II. The arc surface II is adapted to the tube rod. The middle of the support plate (19) and the mounting frame (23) are fixed with an installation shaft (20). The installation shaft (20) extends into the interior of the gear (22) and is fixed with the gear (22). The installation shaft (20) is fixedly connected to the bearing platform (9) and the shaping block (18). A third telescopic motor (7) is fixed on one side of the bearing platform (9). A push block (10) is fixed at the output end of the third telescopic motor (7). A limit block II (11) is fixed on one side of the push block (10). An arc surface III is provided on one side of the limit block II (11). The top of the mounting shaft (20) is fixed with a long plate (21), and the bottom of the long plate (21) is fixed with a vision unit for capturing the bending angle of the pipe. A sleeve (33) is fixed on the side of the fixed sleeve (32) away from the storage box (25). Both the fixed sleeve (32) and the sleeve (33) are hollow structures and penetrate each other. Cleaning cotton 1 (17) is provided on both the upper and lower sides of the sleeve (33). Several oil outlet holes (36) are opened on the upper part of the sleeve (33). The oil outlet holes (36) are used to connect the inside and outside of the sleeve (33). Two sets of cleaning cotton 2 (16) are provided inside the sleeve (33). The bending detection system includes an angle analysis module and an adjustment module. The angle analysis module is electrically connected to the vision unit and the pressure sensor (35), and the adjustment module is electrically connected to cylinder two (27) and cylinder one (26).

2. The online bending angle detection device for a pipe bending machine according to claim 1, characterized in that: An oil pipe (29) is connected between the fixed sleeve (32) and the storage tank (25), and an oil pump (30) is fixedly connected to the oil pipe (29).

3. The online bending angle detection device for a pipe bending machine according to claim 1, characterized in that: The mounting plate (31) is fixed on the side of the fixed sleeve (32) near the storage box (25), and the cylinder two (27) is fixed on the top of the storage box (25). The output end of the cylinder two (27) is fixedly connected to the mounting plate (31).

4. The online bending angle detection device for a pipe bending machine according to claim 1, characterized in that: The pushing assembly includes a base (3) fixed on the base frame (1) and a support tube (2) fixed on one side of the base frame (1). A first telescopic motor (4) is fixed on one side of the base (3). A push rod (5) is fixed at the output end of the first telescopic motor (4). A positioning rod (14) is fixed at one end of the push rod (5) near the bending assembly. The fixing sleeve (32) is fixed to the push rod (5).

5. The online bending angle detection device for a pipe bending machine according to claim 1, characterized in that: The support tube (2) is located below the push rod (5), and the support tube (2) is bent.

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