Turning apparatus for metal bellows

Abstract

This invention relates to the field of turning technology, and more particularly to a turning equipment for metal corrugated pipe blanks, including a machine tool body. The machine tool body is equipped with a turning mechanism for turning the end of the corrugated pipe. A fixed frame is fixedly connected to the top of the machine tool body. This invention, by inserting the upper rod, middle rod, and lower rod into the corrugated pipe and fixing the blank after the upper and lower air bladders are inflated, can provide full support for the long metal corrugated pipe from the inside during the turning process. This effectively suppresses the deflection and vibration of the overhanging section under its own weight and cutting force, avoids tool deflection, and ensures the turning accuracy of the end face. At the same time, after the turning is completed, the upper and lower air bladders can be controlled to release air in sequence, so that the blank slides relative to the upper rod, middle rod, and lower rod and makes way for the end of the lower rod. Then, by changing the direction and fixing through the top clamping mechanism and removing the moving seat, the finished product can be directly pulled out from the other end and a new blank can be loaded, realizing the integrated operation of support and unloading.

Description

Technical Field

[0001] This invention relates to the field of turning technology, and in particular to a turning device for metal corrugated pipe blanks. Background Technology

[0002] Metal corrugated pipe blanks are corrugated tubular semi-finished products made from metal strips through forming processes. The quality of the end cut directly affects the subsequent welding performance. To ensure the mechanical strength and sealing reliability of the corrugated pipe after welding, the end of the blank needs to be precisely machined. The machining equipment mainly consists of a lathe body, a rotary chuck, cutting tools, and a control system. During use, the blank is fixed on the chuck, which drives the blank to rotate. The cutting tool feeds along a set trajectory to precisely cut the end face or weld joint of the blank, removing excess material and obtaining a smooth cut, thus ensuring high-quality welding in the future.

[0003] Metal corrugated pipe blanks are semi-finished products in the corrugated pipe manufacturing process. Their end faces need to be machined to meet welding accuracy requirements. Existing machining equipment usually uses a chuck to hold one end of the blank for machining. When the blank is long, the overhanging section lacks effective internal support under its own weight and cutting force, resulting in significant deflection and vibration of the pipe wall. During the cutting process, tool deflection occurs, making it difficult to guarantee the flatness and perpendicularity of the end face, which affects the subsequent welding quality and product sealing performance.

[0004] Therefore, a turning machine for metal corrugated pipe blanks is proposed to solve the above problems. Summary of the Invention

[0005] To address the technical problem of insufficient internal support for the tube blank during the machining of long metal corrugated pipes, this invention provides a machining equipment for metal corrugated pipe blanks.

[0006] The technical solutions provided by the embodiments of the present invention are as follows: This invention provides a turning device for a metal corrugated pipe blank, comprising a machine tool body, a turning mechanism for turning the end of the corrugated pipe on the machine tool body, a fixed frame fixedly connected to the top of the machine tool body, a lower clamp for placing the corrugated pipe fixedly connected to the side of the fixed frame near the turning mechanism, a clamping mechanism for clamping the corrugated pipe provided on the side wall of the fixed frame relative to the upper position of the lower clamp, a support frame fixedly connected to the side wall of the machine tool body, a sliding seat slidably connected to the inner side of the support frame, a movable seat provided above the sliding seat, an upper electric telescopic cylinder fixedly connected inside the sliding seat, the output end of the upper electric telescopic cylinder passing through the top of the sliding seat and fixedly connected to the bottom end of the movable seat, a vertical groove penetrating the side wall of the movable seat, an upper rod provided in the vertical groove, and a fixing mechanism for clamping and fixing the upper rod provided in the vertical groove; The upper rod is provided with a middle rod and a lower rod in sequence on the side near the turning mechanism. The upper rod and the lower rod are both fixedly connected with threaded heads on the side close to each other. A top frame is fixedly connected between the fixed frame and the machine cover of the machine tool body. The top frame is provided with a top clamping mechanism for clamping the end of the lower rod.

[0007] In the above technical solution, the top clamping mechanism further includes a lower electric telescopic cylinder, an L-shaped plate, and a U-shaped seat. The L-shaped plate is laterally slidably connected to the inner side of the top frame. The lower electric telescopic cylinder is fixedly connected to the top of the top frame, and its output end is fixedly connected to the side wall of the top frame. The U-shaped seat is located below the top frame and is fixedly connected to the side wall of the L-shaped plate. A groove is formed through the inner side of the U-shaped seat, and an upper clamping plate is provided in the groove. The rear side of the U-shaped seat is fixedly connected to the top electric telescopic cylinder, and the output end of the top electric telescopic cylinder passes through the groove and is fixedly connected to the rear side of the upper clamping plate. The bottom end of the upper clamping plate is inclined, and both sides of the bottom end of the U-shaped seat are inclined. The top clamping mechanism can clamp and fix the lower rod when it protrudes from the rod end. Then, the moving seat can be withdrawn, and the finished product can be directly pulled out from the other end and a new tube blank can be installed.

[0008] In the above technical solution, the fixing mechanism further includes a bottom electric telescopic cylinder and a lower clamping plate. A side groove is opened inside the vertical groove, and the lower clamping plate is disposed inside the side groove. The bottom electric telescopic cylinder is fixedly connected to the front side of the moving seat. The output end of the bottom electric telescopic cylinder passes through the side groove and is fixedly connected to the front side of the lower clamping plate. The bottom end of the lower clamping plate is inclined, and both sides of the top end of the vertical groove are inclined. Through the fixing mechanism, the upper pipe can be firmly clamped inside the moving seat, ensuring the support effect for the long corrugated pipe.

[0009] In the above technical solution, the top of the upper rod is further provided with a transverse groove, a transverse block is slidably connected to the inner side of the transverse groove, an upper airbag is fixedly connected to the outer wall of the transverse block, a guide rod is fixedly connected to the side wall of the transverse block, and the guide rod is provided through the side wall of the upper rod. A return spring is fixedly connected between the side wall of the transverse block and the inner side of the transverse groove, and the side end of the guide rod is provided with a smooth arc surface. A vertical block is fixedly connected to the side of the sliding seat away from the turning mechanism. The top of the vertical block is inclined. The side end of the guide rod abuts against the side wall of the vertical block. An air pump is fixedly connected to the rear side of the sliding seat. A lower air bladder is fixedly connected through the outer wall of the lower rod. A middle tube is fixedly connected to the inner side of the middle rod. A pair of two-position three-way solenoid valves are fixedly connected to the bottom end of the vertical groove. An air inlet pipe is fixedly connected between the two-position three-way solenoid valves and the air outlet of the air pump. The two-position three-way solenoid valves are respectively connected to the air pump and the upper and lower air bladders. The inflation, pressure holding and deflation of the air bladders are controlled by electromagnetic switching. The two solenoid valves independently control the upper and lower air bladders, which can realize differential control. After turning, the upper air bladder deflates and the lower air bladder holds pressure, so that the tube blank can slide controllably relative to the rod body, providing pneumatic execution conditions for reversing fixation and pulling out the tube at the rear end. Each of the two three-way solenoid valves has an upper conical connector fixedly connected to its top. The upper conical connector is made of rubber. An upper hose is fixedly connected to the side of the upper airbag. The other end of the upper hose is fixedly connected to the bottom of the outer wall of the upper rod. The other end of the upper hose is positioned above one of the upper conical connectors. The upper airbag and the lower airbag are respectively located at the top of the upper rod and the outer wall of the lower rod. After inflation, they expand radially from the inside of the tube and fit against the inner wall. The friction force is used to fix the tube blank to the rod body. During turning, the two airbags provide internal support together to suppress deflection and vibration. During unloading, differential air release allows the tube blank to slide relative to the rod body, making it easier to change direction and fix the rod end and pull out the tube at the rear end.

[0010] In the above technical solution, the lower airbag side end is further fixedly connected to an upper tube, the upper rod is internally fixedly connected to a lower tube, both the upper tube and the lower tube are set through the threaded head side wall, the lower tube is set through the transverse block, the other end of the lower tube is fixedly connected to the bottom end of the outer wall of the upper rod, the other end of the lower tube is set above another upper conical connector, both ends of the middle tube are fixedly connected to lower conical connectors that seal and connect with the lower tube and the upper tube, and the lower conical connectors are made of rubber.

[0011] In the above technical solution, threaded grooves are provided at both ends of the middle rod, and the two threaded heads are threadedly connected to the threaded grooves at both ends of the middle rod. The upper rod, middle rod and lower rod are connected by threaded engagement to form a detachable and modular rod body. The operator can steplessly change the overall length of the rod body and the front end extension distance by rotating the middle rod, so that the internal airbag support position can be changed accordingly with the change of tube blank specifications, always accurately aligned with the weak bending area of ​​the tube body, and ensuring that corrugated tube blanks of various lengths can obtain reliable internal support and vibration reduction during the overhang processing. A threaded rod is rotatably connected to the inner side of the support frame. The threaded rod is threaded through and connected to the inner side wall of the sliding seat. A drive motor is fixedly connected to the side wall of the support frame. The output end of the drive motor passes through the inner side of the support frame and is fixedly connected to the side wall of the threaded rod. The drive motor drives the threaded rod to rotate, which in turn drives the threaded sliding block to move. This allows the moving seat to be flexibly adjusted according to processing requirements, improving the production line changeover efficiency and equipment utilization.

[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention, by inserting the upper, middle, and lower rods into the bellows and fixing the tube blank after the upper and lower air bladders are inflated, can provide full internal support for the long metal bellows during the turning process. This effectively suppresses the deflection and vibration of the overhanging section under its own weight and cutting force, avoids tool deflection, and ensures the turning accuracy of the end face. At the same time, after the turning is completed, the upper and lower air bladders can be controlled to release air in sequence, causing the tube blank to slide relative to the upper, middle, and lower rods and give way to the end of the lower rod. Then, the top clamping mechanism reverses the direction and fixes the tube blank, and the moving seat is removed. The finished product can then be directly pulled out from the other end and a new tube blank can be loaded. This achieves integrated operation of support and unloading, eliminating the need for external grippers, avoiding damage to the machined end face, and improving processing efficiency and automation.

[0013] 2. This invention makes the connection positions of the upper rod, middle rod, and lower rod to the movable seat adjustable, and designs the upper rod, lower rod, and middle rod as a combined structure with threaded connections. This allows the middle rod to be rotated and adjusted to fit the length of the metal bellows, thereby flexibly changing the total length and overhang of the upper rod, middle rod, and lower rod. This design ensures that the internal support points are always in the deflection-sensitive area of ​​the tube blank, guaranteeing effective support for tube blanks of different lengths. This significantly improves the versatility and applicability of the equipment and reduces tooling costs. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the front of the turning equipment of the present invention; Figure 2 This is a partial three-dimensional structural diagram of the front of the machine tool frame and turning mechanism of the present invention; Figure 3 This is a side perspective view of the fixing frame, middle rod, lower rod, and support frame of the present invention; Figure 4 This is a partial cross-sectional three-dimensional structural diagram of the top frame, L-shaped plate, and U-shaped seat of the present invention; Figure 5 This is a bottom-view perspective view of the initial state of the fixing frame, middle rod, lower rod, and support frame of the present invention. Figure 6 This is a frontal perspective view of the initial state of the fixing frame, middle rod, lower rod, and support frame of the present invention. Figure 7 This is a frontal perspective view of the upper rod, middle rod, lower rod, and support frame of the present invention. Figure 8 This is a partial cross-sectional three-dimensional structural diagram of the movable seat, upper rod, and vertical block of the present invention. Figure 9 This is a rear-view partial cross-sectional three-dimensional structural diagram of the upper rod and middle tube of the present invention; Figure 10 This is a three-dimensional side view of the movable seat and bottom electric telescopic cylinder of the present invention; Figure 11 This is a schematic diagram of the three-dimensional structure of the middle rod, upper rod, and upper airbag of the present invention, which is partially cut apart. Figure 12 This is a schematic diagram of the three-dimensional structure of the middle rod and lower rod of the present invention, which is partially cut and separated.

[0015] In the diagram: 1. Machine tool body; 2. Fixed frame; 3. Lower clamp; 4. Clamping mechanism; 5. Turning mechanism; 6. Support frame; 7. Sliding seat; 8. Moving seat; 9. Upper electric telescopic cylinder; 10. Vertical slot; 11. Upper rod; 12. Middle rod; 13. Lower rod; 14. Top frame; 15. Threaded head; 16. Lower electric telescopic cylinder; 17. L-shaped plate; 18. U-shaped seat; 19. Upper clamping plate; 20. Top electric telescopic cylinder; 21. 21. Bottom electric telescopic cylinder; 22. Lower clamping plate; 23. Horizontal groove; 24. Horizontal block; 25. Upper airbag; 26. Guide rod; 27. Return spring; 28. Vertical block; 29. ​​Air pump; 30. Lower airbag; 31. Middle tube; 32. Two-position three-way solenoid valve; 33. Upper conical connector; 34. Upper hose; 35. Upper tube; 36. Lower tube; 37. Lower conical connector; 38. Threaded rod; 39. Drive motor; 40. Air inlet pipe. Detailed Implementation

[0016] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the invention is not limited to the specific embodiments disclosed below.

[0018] In practical use, it has been found that the metal corrugated pipe blank is a semi-finished product in the corrugated pipe manufacturing process. Its end face needs to be machined to meet the welding accuracy requirements. Existing machining equipment usually uses a chuck to hold one end of the blank for processing. When the blank is long, the overhanging section lacks effective internal support under its own weight and cutting force, which causes obvious deflection and vibration of the pipe wall. During the cutting process, the tool deflection phenomenon occurs, making it difficult to guarantee the flatness and perpendicularity of the end face, which affects the subsequent welding quality and product sealing performance. To solve the above problems, the following structure was invented.

[0019] like Figures 1-12 The machine tool shown is a turning device for a metal corrugated pipe blank, including a machine body 1. The machine body 1 is equipped with a turning mechanism 5 for turning the ends of the corrugated pipe. A fixed frame 2 is fixedly connected to the top of the machine body 1. A lower clamp 3 for placing the corrugated pipe is fixedly connected to the side of the fixed frame 2 near the turning mechanism 5. A clamping mechanism 4 for holding the corrugated pipe is located on the side wall of the fixed frame 2 above the lower clamp 3. The clamping mechanism 4 consists of an upper clamp and a hydraulic telescopic cylinder. The hydraulic telescopic cylinder drives the upper clamp to move vertically upwards and downwards. During loading... The upper clamp is raised, and the bellows is positioned in the lower clamp 3. During processing, the hydraulic telescopic cylinder pushes the upper clamp down, which cooperates with the lower clamp 3 to clamp the bellows from the outer wall, keeping it stable during rotary turning and preventing displacement or vibration. After the bellows is clamped and fixed by the clamping mechanism 4, the spindle drives the tube blank to rotate around the axis, and the cutting tool on the tool holder feeds towards the end face according to the set trajectory. The excess material at the end of the tube blank is removed by rotary cutting, thereby obtaining a flat and perpendicular welding end face that meets the requirements, providing quality assurance for subsequent welding processes. A support frame 6 is fixedly connected to the side wall of the machine tool body 1. A sliding seat 7 is slidably connected to the inner side of the support frame 6. A movable seat 8 is provided above the sliding seat 7. An upper electric telescopic cylinder 9 is fixedly connected inside the sliding seat 7. The output end of the upper electric telescopic cylinder 9 passes through the top of the sliding seat 7 and is fixedly connected to the bottom of the movable seat 8. A vertical groove 10 is provided through the side wall of the movable seat 8. An upper rod 11 is provided in the vertical groove 10. A fixing mechanism for clamping and fixing the upper rod 11 is provided in the vertical groove 10. The upper rod 11 is provided with a middle rod 12 and a lower rod 13 on the side near the turning mechanism 5. Threaded heads 15 are fixedly connected to the sides of the upper rod 11 and the lower rod 13. A top frame 14 is fixedly connected between the fixed frame 2 and the machine cover of the machine body 1. The top frame 14 is provided with a top clamping mechanism for clamping the end of the lower rod 13. Threaded grooves are opened at both ends of the middle rod 12, and two threaded heads 15 are threadedly connected to the threaded grooves at both ends of the middle rod 12.

[0020] The top clamping mechanism includes a lower electric telescopic cylinder 16, an L-shaped plate 17, and a U-shaped seat 18. The L-shaped plate 17 is laterally slidably connected to the inner side of the top frame 14. The lower electric telescopic cylinder 16 is fixedly connected to the top of the top frame 14, and its output end is fixedly connected to the side wall of the top frame 14. The U-shaped seat 18 is located below the top frame 14 and is fixedly connected to the side wall of the L-shaped plate 17. A groove is formed through the inner side of the U-shaped seat 18, and an upper clamping plate 19 is provided in the groove. The rear side of the U-shaped seat 18 is fixedly connected to the top electric telescopic cylinder 20. The output end of the electric telescopic cylinder 20 is fixedly connected to the rear side of the upper clamping plate 19 through the groove. The bottom end of the upper clamping plate 19 is inclined. With the inclined surface, the movement of the upper clamping plate 19 can drive the inclined surface to move, pressing the lower rod 13 tightly into the U-shaped seat 18. Both sides of the bottom end of the U-shaped seat 18 are inclined. With the inclined surface, when there is a deviation between the lower rod 13 and the inside of the U-shaped seat 18, the lower rod 13 can be pressed into the inside of the U-shaped seat 18 by the inclined surface, ensuring the stable operation of subsequent clamping work.

[0021] The fixing mechanism includes a bottom electric telescopic cylinder 21 and a lower clamping plate 22. A side groove is opened inside the vertical groove 10, and the lower clamping plate 22 is set inside the side groove. The bottom electric telescopic cylinder 21 is fixedly connected to the front side of the movable seat 8. The output end of the bottom electric telescopic cylinder 21 passes through the side groove and is fixedly connected to the front side of the lower clamping plate 22. The bottom end of the lower clamping plate 22 is inclined. Through the setting of the inclined surface, the bottom electric telescopic cylinder 21 can drive the lower clamping plate 22 to move, thereby driving the inclined surface to move, thereby gradually squeezing the upper rod 11 into the vertical groove 10. The top two sides of the vertical groove 10 are inclined. When the vertical groove 10 moves upward and the position of the vertical groove 10 and the upper rod 11 deviates, the upper rod 11 can be squeezed by the inclined surfaces on both sides of the top of the vertical groove 10 to ensure that the upper rod 11 is accurately inserted into the vertical groove 10.

[0022] A transverse groove 23 is provided through the top of the upper rod 11. A transverse block 24 is slidably connected to the inner side of the transverse groove 23. An upper airbag 25 is fixedly connected to the outer wall of the transverse block 24. A guide rod 26 is fixedly connected to the side wall of the transverse block 24 and is provided through the side wall of the upper rod 11. A return spring 27 is fixedly connected between the side wall of the transverse block 24 and the inner side of the transverse groove 23. The side end of the guide rod 26 is set as a smooth arc surface. A vertical block 28 is fixedly connected to the side of the sliding seat 7 away from the turning mechanism 5. The top of the vertical block 28 is inclined. The side end of the guide rod 26 abuts against the side wall of the vertical block 28. An air pump 29 is fixedly connected to the rear side of the sliding seat 7. A lower air bladder 30 is fixedly connected through the outer wall of the lower rod 13. A middle tube 31 is fixedly connected to the inner side of the middle rod 12. A pair of two-position three-way solenoid valves 32 are fixedly connected to the bottom end of the vertical groove 10. An air inlet pipe 40 is fixedly connected between the two-position three-way solenoid valves 32 and the air outlet of the air pump 29. The two-position three-way solenoid valve 32 has three channels: an air inlet, a working port, and an exhaust port. When energized, the air inlet and the working port are connected, and the compressed air output by the air pump 29 enters the upper airbag 25 or the lower airbag 30 through the air inlet pipe 40 to achieve inflation. When de-energized, the air inlet is closed, and the working port and the exhaust port are connected, and the gas in the airbag is discharged to the atmosphere through the exhaust port to achieve deflation. By switching the on and off of the solenoid coil, the inflation, pressure holding, and deflation states of the upper airbag 25 or the lower airbag 30 can be controlled.

[0023] Both three-way solenoid valves 32 are fixedly connected to the top of an upper conical connector 33. The upper conical connector 33 is made of rubber. The upper airbag 25 is fixedly connected to the side of an upper hose 34. The other end of the upper hose 34 is fixedly connected to the bottom of the outer wall of the upper rod 11, and the other end of the upper hose 34 is positioned above one of the upper conical connectors 33.

[0024] The lower airbag 30 is fixedly connected to the side end of the upper tube 35. The upper rod 11 is fixedly connected to the lower tube 36 through the inside. Both the upper tube 35 and the lower tube 36 are set through the side wall of the threaded head 15. The lower tube 36 is set through the inside of the horizontal block 24. The other end of the lower tube 36 is fixedly connected to the bottom end of the outer wall of the upper rod 11. The other end of the lower tube 36 is set above another upper conical connector 33. Both ends of the middle tube 31 are fixedly connected to the lower conical connector 37 that seals and connects with the lower tube 36 and the upper tube 35. The lower conical connector 37 is made of rubber.

[0025] When machining the long corrugated pipe (in the initial state, the upper rod 11, middle rod 12 and lower rod 13 are clamped and fixed in the U-shaped seat 18, and the upper rod 11 is in the open state), first insert the corrugated pipe through the upper rod 11, and then pull the corrugated pipe onto the lower rod 13. Then, control the upper electric telescopic cylinder 9 to drive the moving seat 8 to move upward. Then, insert the upper rod 11 into the vertical groove 10. Then, control the bottom electric telescopic cylinder 21 to start and drive the lower clamping plate 22 to move. Thus, the upper rod 11 is tightly squeezed into the inside of the vertical groove 10 by the inclined surface of the lower clamping plate 22. At the same time, the upper conical connector 33 is tightly inserted into the inside of the upper hose 34 and the lower pipe 36, thereby realizing the connection of the air passage. Then, the top electric telescopic cylinder 20 can be controlled to drive the upper clamping plate 19 to reset, releasing the clamping and fixing of the lower rod 13. Then, the lower electric telescopic cylinder 16 can be controlled to drive the L-shaped plate 17 and the U-shaped seat 18 to reset (during this process, the guide rod 26 will move downwards, moving to the inclined surface of the vertical block 28. Since the horizontal block 24 and the guide rod 26 can only slide laterally in the horizontal groove 23, under the pressure of the inclined surface at the top of the vertical groove 10, the guide rod 26 and the horizontal block 24 will slide in the horizontal groove 23, driving the upper airbag 25 to move, while simultaneously stretching the reset spring 27, until the guide rod 26 moves to the side wall of the vertical block 28, at which point the upper airbag 25 is fully reset), thereby removing the U-shaped seat 18 from the lower rod 13. At this point, the top electric telescopic cylinder 9 can be controlled to drive the upper rod 11, middle... Rod 12, lower rod 13, and bellows move downwards until the bellows moves onto the lower clamp 3. At the same time, the operator adjusts the position of the bellows on the lower clamp 3, which controls the air pump 29 to start and opens two two-position three-way solenoid valves 32. At this time, the gas output by the air pump 29 enters the two-position three-way solenoid valve 32 through the air inlet pipe 40, and then enters the upper air bag 25 through the upper hose 34, causing the upper air bag 25 to inflate and tighten the bellows. At the same time, the gas in the other two-position three-way solenoid valve 32 is transmitted into the lower air bag 30 through the lower pipe 36, middle pipe 31, and upper pipe 35, thereby lifting the lower air bag 30 and tightening the other end of the bellows. Then, the force clamping mechanism 4 can be started to clamp and fix the bellows, and the turning mechanism 5 can be started to perform turning processing on the bellows. After machining is completed, the clamping mechanism 4 and turning mechanism 5 are reset. Then, the lower electric telescopic cylinder 16 moves the U-shaped seat 18 to a position above the lower rod 13. Next, the upper electric telescopic cylinder 9 moves the upper rod 11, middle rod 12, lower rod 13, and bellows out of the lower clamp 3. After removal, one of the two-position three-way solenoid valves 32 releases air from the lower airbag 30, simultaneously moving the guide rod 26 upwards. The guide rod 26 then moves to the inclined surface of the vertical block 28, gradually relieving pressure on it. Subsequently, under the elastic force of the return spring 27, the guide rod 26 and horizontal block 24 are reset, simultaneously moving the upper airbag 25 and bellows (due to the lower airbag 3...). The upper airbag 25 is inflated, allowing the bellows to move. This frees up the end of the lower rod 13, which is then inserted into the U-shaped seat 18. Finally, the top electric telescopic cylinder 20 moves the upper clamping plate 19, which clamps the lower rod 13 tightly within the U-shaped seat 18. Then, another two-position three-way solenoid valve 32 is used to deflate the upper airbag 25. The bottom electric telescopic cylinder 21 is then used to reset the lower clamping plate 22, releasing the clamp on the upper rod 11. The top electric telescopic cylinder 9 is then used to move the moving seat 8 down to reset, allowing the finished bellows to be removed. The above operation is then repeated to insert a new bellows.

[0026] In summary, through the design of the above structure, the upper rod 11, middle rod 12, and lower rod 13 are inserted into the corrugated pipe, and the tube blank is fixed after the upper air bladder 25 and lower air bladder 30 are inflated. This allows for full internal support of the long metal corrugated pipe during the turning process, effectively suppressing the deflection and vibration of the overhanging section under its own weight and cutting force, avoiding tool deflection, and ensuring the turning accuracy of the end face. At the same time, after the turning is completed, the upper air bladder 25 and lower air bladder 30 can be controlled to release air in sequence, causing the tube blank to slide relative to the upper rod 11, middle rod 12, and lower rod 13 and give way to the rod end of the lower rod 13. Then, the top clamping mechanism reverses the direction and fixes the tube blank, and the moving seat 8 is removed. The finished product can then be directly pulled out from the other end and a new tube blank can be loaded. This achieves integrated operation of support and unloading, eliminating the need for external grippers, avoiding damage to the machined end face, and improving processing efficiency and automation.

[0027] Based on the above embodiments, it was found during use that although the above solution can achieve internal support and automatic transfer and unloading of long corrugated pipes, the length and connection position of the long rod are fixed and cannot be flexibly adjusted according to the length of the long corrugated pipe. When processing long corrugated pipes, the support point deviates from the deflection area, resulting in insufficient support. Therefore, when changing the type, the upper rod 11, middle rod 12 and lower rod 13 need to be replaced as a whole, resulting in low versatility and changing efficiency. In order to solve the above problems, further improvements were made to the above structure.

[0028] A threaded rod 38 is rotatably connected to the inner side of the support frame 6. The threaded rod 38 is threaded through and connected to the inner wall of the sliding seat 7. A drive motor 39 is fixedly connected to the side wall of the support frame 6. The output end of the drive motor 39 passes through the inner side of the support frame 6 and is fixedly connected to the side wall of the threaded rod 38.

[0029] When producing corrugated pipes of different lengths, first control the top electric telescopic cylinder 20 to drive the upper clamping plate 19 to reset, releasing the clamping and fixing of the lower rod 13, so that the upper rod 11, middle rod 12 and lower rod 13 can be taken out. The operator unscrews the middle rod 12 from between the threaded head 15 of the upper rod 11 and the lower rod 13 and takes it off. Then, select a new middle rod 12 that matches the length of the corrugated pipe to be processed. First, screw one end of the new middle rod 12 onto the threaded head 15 of the upper rod 11 (at this time, the lower tube 36 will be sealed and connected with the lower tapered joint 37 on the middle rod 12). Thread the other end of the middle rod 12 onto the threaded head 15 of the lower rod 13 (at this time, the upper tube 35 will be sealed and connected with the lower tapered joint 37 on the middle rod 12). Then clamp the lower rod 13 in the U-shaped seat 18 (during installation, it is necessary to ensure that the upper hose 34 on the upper rod 11 and the lower tube 36 are in a vertical downward position). Then, start the drive motor 39 to rotate the threaded rod 38, which in turn moves the threaded sliding seat 7 and the movable seat 8, so that the movable seat 8 moves to the position below the upper rod 11 (ensuring that the upper tapered connector 33 is aligned with the upper hose 34 and the lower tube 36), thus completing the adjustment.

[0030] In summary, through the above structural design, the connection positions of the upper rod 11, middle rod 12, and lower rod 13 with the movable seat 8 are set to be adjustable. The upper rod 11, lower rod 13, and middle rod 12 are designed as a combined structure with threaded connections, allowing the middle rod 12 to be rotated and adjusted to fit the length of the metal bellows. This allows for flexible changes in the total length and overhang of the upper rod 11, middle rod 12, and lower rod 13. This design ensures that the internal support points are always in the deflection-sensitive area of ​​the tube blank, guaranteeing effective support for tube blanks of different lengths. This significantly improves the versatility and applicability of the equipment and reduces tooling costs.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of the present invention.

[0032] Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of the present invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed.

Claims

1. A turning device for a metal corrugated pipe blank, comprising a machine tool body (1), wherein the machine tool body (1) is provided with a turning mechanism (5) for turning the end of the corrugated pipe, a fixed frame (2) is fixedly connected to the top of the machine tool body (1), a lower clamp (3) for placing the corrugated pipe is fixedly connected to the side of the fixed frame (2) near the turning mechanism (5), and a clamping mechanism (4) for clamping the corrugated pipe is provided on the side wall of the fixed frame (2) above the lower clamp (3), characterized in that, The machine tool body (1) is fixedly connected to a support frame (6) on its side wall. A sliding seat (7) is slidably connected to the inner side of the support frame (6). A movable seat (8) is provided above the sliding seat (7). An upper electric telescopic cylinder (9) is fixedly connected inside the sliding seat (7). The output end of the upper electric telescopic cylinder (9) passes through the top of the sliding seat (7) and is fixedly connected to the bottom of the movable seat (8). A vertical groove (10) is provided through the side wall of the movable seat (8). An upper rod (11) is provided in the vertical groove (10). A fixing mechanism for clamping and fixing the upper rod (11) is provided in the vertical groove (10). The upper rod (11) is provided with a middle rod (12) and a lower rod (13) on the side near the turning mechanism (5). The upper rod (11) and the lower rod (13) are both fixedly connected with threaded heads (15) on the side close to each other. The fixed frame (2) is fixedly connected with the machine cover of the machine tool body (1) with a top frame (14). The top frame (14) is provided with a top clamping mechanism for clamping the end of the lower rod (13).

2. The turning equipment for metal corrugated pipe blanks according to claim 1, characterized in that, Both ends of the middle rod (12) are provided with threaded grooves, and the two threaded heads (15) are threadedly connected to the threaded grooves at both ends of the middle rod (12).

3. The turning equipment for metal corrugated pipe blanks according to claim 1, characterized in that, The top clamping mechanism includes a lower electric telescopic cylinder (16), an L-shaped plate (17), and a U-shaped seat (18). The L-shaped plate (17) is laterally slidably connected to the inner side of the top frame (14). The lower electric telescopic cylinder (16) is fixedly connected to the top of the top frame (14). The output end of the lower electric telescopic cylinder (16) is fixedly connected to the side wall of the top frame (14). The U-shaped seat (18) is located below the top frame (14). The U-shaped seat (18) is fixedly connected to the side wall of the L-shaped plate (17). A groove is provided through the inner side of the U-shaped seat (18). An upper clamping plate (19) is provided in the groove. The rear side of the U-shaped seat (18) is fixedly connected to the top electric telescopic cylinder (20). The output end of the top electric telescopic cylinder (20) passes through the groove and is fixedly connected to the rear side of the upper clamping plate (19). The bottom end of the upper clamping plate (19) is inclined. Both sides of the bottom end of the U-shaped seat (18) are inclined.

4. The turning equipment for metal corrugated pipe blanks according to claim 1, characterized in that, The fixing mechanism includes a bottom electric telescopic cylinder (21) and a lower clamping plate (22). A side groove is opened inside the vertical groove (10). The lower clamping plate (22) is set inside the side groove. The bottom electric telescopic cylinder (21) is fixedly connected to the front side of the movable seat (8). The output end of the bottom electric telescopic cylinder (21) passes through the side groove and is fixedly connected to the front side of the lower clamping plate (22). The bottom end of the lower clamping plate (22) is inclined. Both sides of the top end of the vertical groove (10) are inclined.

5. The turning equipment for metal corrugated pipe blanks according to claim 1, characterized in that, The top of the upper rod (11) is provided with a transverse groove (23), and a transverse block (24) is slidably connected to the inner side of the transverse groove (23). An upper airbag (25) is fixedly connected to the outer wall of the transverse block (24). A guide rod (26) is fixedly connected to the side wall of the transverse block (24), and the guide rod (26) is provided through the side wall of the upper rod (11). A return spring (27) is fixedly connected between the side wall of the transverse block (24) and the inner side of the transverse groove (23). The side end of the guide rod (26) is provided with a smooth arc surface. A vertical block (28) is fixedly connected to the side of the sliding seat (7) away from the turning mechanism (5). The top of the vertical block (28) is inclined. The side end of the guide rod (26) abuts against the side wall of the vertical block (28). An air pump (29) is fixedly connected to the rear side of the sliding seat (7). A lower air bag (30) is fixedly connected through the outer wall of the lower rod (13). A middle tube (31) is fixedly connected to the inner side of the middle rod (12). A pair of two-position three-way solenoid valves (32) are fixedly connected to the bottom end of the vertical groove (10). An air inlet pipe (40) is fixedly connected between the two-position three-way solenoid valves (32) and the air outlet of the air pump (29).

6. The turning equipment for metal corrugated pipe blanks according to claim 5, characterized in that, The top of each of the two three-way solenoid valves (32) is fixedly connected to an upper conical connector (33). The upper conical connector (33) is made of rubber. The upper airbag (25) is fixedly connected to an upper hose (34) on its side. The other end of the upper hose (34) is fixedly connected to the bottom of the outer wall of the upper rod (11), and the other end of the upper hose (34) is located above one of the upper conical connectors (33).

7. The turning equipment for metal corrugated pipe blanks according to claim 5, characterized in that, The lower airbag (30) is fixedly connected to the side end of the upper tube (35), and the upper rod (11) is fixedly connected to the lower tube (36) through the inside. The upper tube (35) and the lower tube (36) are both set through the side wall of the threaded head (15). The lower tube (36) is set through the inside of the horizontal block (24). The other end of the lower tube (36) is fixedly connected to the bottom end of the outer wall of the upper rod (11). The other end of the lower tube (36) is set above another upper conical connector (33). The two ends of the middle tube (31) are fixedly connected to the lower conical connector (37) that seals and connects with the lower tube (36) and the upper tube (35). The lower conical connector (37) is made of rubber.

8. The turning equipment for metal corrugated pipe blanks according to claim 1, characterized in that, The support frame (6) is rotatably connected to a threaded rod (38), which is threaded through and connected to the inner wall of the sliding seat (7). The support frame (6) is fixedly connected to a drive motor (39), and the output end of the drive motor (39) passes through the inner side of the support frame (6) and is fixedly connected to the side wall of the threaded rod (38).

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