Self-centering thin-wall tensioning device
By designing a self-centering thin-walled tensioning device, an air pump is used to drive an airbag to tension the workpiece. Combined with the locking mechanism of the turntable and the insertion rod, the deformation problem of thin-walled workpieces during clamping is solved, achieving stable fixing and rotation adjustment, and improving machining accuracy.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2026-03-10
AI Technical Summary
Existing fixtures often require a large clamping force when holding thin-walled workpieces, which can easily lead to workpiece deformation and clamping failure.
The device employs a self-centering thin-walled tensioning mechanism. It uses a double-ended screw, threaded plate, mounting bracket, support side plate, and turntable in conjunction with a tensioning cylinder. An air pump drives the airbag to inflate, causing the inner top plate to drive the outer tensioning plate outward through a sliding column. This achieves self-centering tensioning and fixing of the workpiece. The rotation adjustment and angle locking of the workpiece are achieved through the cooperation of the turntable and the insert rod.
It achieves stable fixation of the workpiece, avoids deformation during clamping, and allows the workpiece to be rotated and angled during processing, thus improving processing accuracy.
Smart Images
Figure CN223981201U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of thin-walled workpiece clamping technology, specifically relating to a self-centering thin-walled tensioning device. Background Technology
[0002] In the field of machining, workpiece clamping is a very important method. Stable workpiece clamping is essential to ensure good accuracy in subsequent machining operations.
[0003] However, when existing fixtures clamp thin-walled workpieces, the workpiece is easily deformed when the clamping force is large because the fixture clamps the outer wall of the thin-walled workpiece, which is relatively thin. This can lead to clamping failure. To address this, we propose a self-centering thin-walled tensioning device. Utility Model Content
[0004] The purpose of this utility model is to provide a self-centering thin-walled tensioning device to solve the problem mentioned in the background art that when existing clamps clamp thin-walled workpieces, the workpiece is easily deformed when the clamping force is large because the clamp is clamped on the outer wall of the thin-walled workpiece and the wall thickness of the thin-walled workpiece is relatively thin, which leads to clamping failure.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a self-centering thin-walled tensioning device, comprising a mounting frame, mounting plates fixedly mounted at the four corners of the mounting frame, a plurality of mounting bolts passing through the mounting plates, a bidirectional screw rotatably mounted inside the mounting frame, one end of the bidirectional screw extending out of the mounting frame and fixedly mounted with a handwheel, threaded plates threaded onto the outer surfaces of the threads at both ends of the bidirectional screw, mounting brackets fixedly mounted on the left and right sides of the threaded plates, a support side plate fixedly mounted between two mounting brackets, a turntable rotatably mounted on the support side plate, and a handwheel fixedly mounted on the side of the turntable. The device includes a handle and an air pump. A tensioning cylinder is fixedly installed on the other side of the turntable, and the tensioning cylinder and the turntable are arranged coaxially. An air pipe is connected to the air outlet of the air pump. The end of the air pipe away from the air pump passes through the turntable and the tensioning cylinder and extends into the interior of the tensioning cylinder. An air bladder is provided inside the tensioning cylinder. The air bladder is connected to the air pipe. Several inner top plates are attached to the outer surface of the air bladder. Several sliding columns are fixedly installed on the side of the inner top plates away from the air bladder. Several receiving grooves are opened on the outer surface of the tensioning cylinder, and an outer tensioning plate is provided in the receiving groove. The sliding columns are slidably installed on the tensioning cylinder, and the end of the sliding column away from the inner top plate is fixedly connected to the outer tensioning plate.
[0006] The above solution utilizes a bidirectional screw in conjunction with a threaded plate, mounting bracket, supporting side plate, turntable, and tensioning cylinder. The rotation of the bidirectional screw enables relative movement of the two tensioning cylinders, allowing them to penetrate deep into both ends of the workpiece. An air pump inflates the airbags, which in turn drives the inner top plate to move the outer tensioning plate outward via a sliding column. This achieves a self-centering tensioning and fixing effect on the workpiece, providing excellent fixation and avoiding the deformation that can easily occur when traditional clamps are used on the outside of the workpiece. The turntable, in conjunction with a handle and insert rod, locks when the insert rod disengages from the slot. This allows for rotational adjustment of the workpiece after tensioning and clamping. After adjustment, the insert rod is inserted back into the slot for locking, achieving angle adjustment of the workpiece. Furthermore, the tensioning cylinder, used with a long screw, allows the user to select the appropriate position of the outer tensioning plate based on the workpiece's end deformation.
[0007] In the above scheme, it should be noted that the air pump is electrically connected to an external power supply.
[0008] In a preferred embodiment, a plurality of guide bars are fixedly installed on the inner wall of the mounting frame, and a plurality of guide grooves are formed on the surface of the threaded plate, the guide bars and guide grooves being used in conjunction.
[0009] By adopting the above scheme, and by setting guide bars and guide grooves in combination, when the bidirectional screw rotates to drive the threaded plate to move, the threaded plate will slide on the surface of the guide bar through the guide groove, thereby ensuring the smooth movement of the threaded plate.
[0010] In a preferred embodiment, the handle has a cavity inside, and a plug rod is slidably installed on the handle opposite the cavity. One end of the plug rod is fixedly installed with a pull ring, and the side of the support plate has several slots. The other end of the plug rod is used in conjunction with the slots.
[0011] Using the above scheme, the insert rod is used in conjunction with the pull ring. When the insert rod is disengaged from the slot, the turntable is unlocked and can be rotated. After the turntable has rotated, the insert rod is inserted into the slot to lock the turntable.
[0012] In a preferred embodiment, a limiting ring is fixedly installed on the outside of the insertion rod, the limiting ring is located inside the cavity, and a spring is fixedly installed between the limiting ring and the inner wall of the cavity.
[0013] Using the above solution, the limiting ring is used in conjunction with spring one. When the insertion rod is disengaged from the slot, spring one deforms. Therefore, the elastic force of spring one can drive the insertion rod to quickly return to the slot and be inserted into it, thus achieving convenient locking. The setting of the limiting ring can play a limiting role and prevent the insertion rod from disengaging from the handle when it moves.
[0014] In a preferred embodiment, a second spring is provided on the outer surface of the sliding column, and the two ends of the second spring are fixedly connected to the inner top plate and the inner wall of the tensioning cylinder, respectively.
[0015] Using the above scheme, when the airbag inflates and drives the inner top plate to move outward, the inner top plate drives the sliding column to move. At this time, the second spring deforms. Therefore, when the airbag deflates, the elastic force of the second spring can be used to drive the outer tension plate to quickly reset, improving the convenience of structural movement.
[0016] In a preferred embodiment, a long screw is threadedly installed on the side of the tensioning cylinder opposite the receiving groove, and a threaded groove is provided on the outer tensioning plate for the long screw to be screwed into.
[0017] By using the above solution and setting long screws, users can select the number of external tensioning plates to use according to the shape of the workpiece. For example, the long screws at the deformed position of the workpiece can be screwed on. At this time, the external tensioning plate at the position will not move outward due to the inflation of the airbag, thus achieving a good protective effect.
[0018] Compared with the prior art, the beneficial effects of this utility model are:
[0019] This self-centering thin-walled tensioning device uses a bidirectional screw in conjunction with a threaded plate, mounting bracket, support side plate, turntable, and tensioning cylinders. The rotation of the bidirectional screw enables the relative movement of the two tensioning cylinders, allowing them to penetrate deep into the two ends of the workpiece. An air pump inflates the airbags, which in turn drives the inner top plate to move the outer tensioning plate outward through the sliding column, achieving a self-centering tensioning and fixing effect on the workpiece. The fixing effect is good, avoiding the workpiece deformation that is easily caused when traditional clamps are held on the outside of the workpiece.
[0020] This self-centering thin-walled tensioning device uses a turntable in conjunction with a handle and a plug rod. When the plug rod disengages from the slot, the turntable locks, allowing for the rotation adjustment of the workpiece after tensioning and clamping. After adjustment, the plug rod is inserted into the slot to lock, thus achieving the angle adjustment effect of the workpiece. Furthermore, the tensioning cylinder is used in conjunction with a long screw, allowing the user to select the appropriate position of the external tensioning plate based on the deformation of the workpiece end. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the structure of this utility model;
[0022] Figure 2 This is a structural schematic diagram of the cross-section of the mounting frame of this utility model;
[0023] Figure 3 This is a schematic diagram of the supporting side plate of this utility model;
[0024] Figure 4 This is a schematic diagram of the top plate and tensioning cylinder of this utility model;
[0025] Figure 5 This is a structural schematic diagram of the cross-section of the turntable and tensioning cylinder of this utility model.
[0026] In the diagram: 1. Mounting frame; 2. Mounting plate; 3. Mounting bolt; 4. Double-ended screw; 5. Threaded plate; 6. Mounting bracket; 7. Support side plate; 8. Turntable; 9. Handle; 10. Tensioning cylinder; 11. Air pump; 12. Air hose; 13. Airbag; 14. Inner top plate; 15. Sliding column; 16. Outer tensioning plate; 17. Guide bar; 18. Insert rod; 19. Pull ring; 20. Limiting ring; 21. Spring 1; 22. Spring 2; 23. Long screw. Detailed Implementation
[0027] Please see Figure 1-5 This utility model provides a self-centering thin-walled tensioning device, including a mounting frame 1. Mounting plates 2 are fixedly mounted at each of the four corners of the mounting frame 1. Several mounting bolts 3 pass through the mounting plates 2. A bidirectional screw 4 is rotatably mounted inside the mounting frame 1. One end of the bidirectional screw 4 extends out of the mounting frame 1 and is fixedly mounted with a handwheel. Threaded plates 5 are threaded onto the outer surface of the threads at both ends of the bidirectional screw 4. Mounting brackets 6 are fixedly mounted on the left and right sides of the threaded plates 5. A support side plate 7 is fixedly mounted between two mounting brackets 6. A turntable 8 is rotatably mounted on the support side plate 7. A handle 9 and an air pump 11 are fixedly mounted on the side of the turntable 8. A tensioning cylinder 1 is fixedly mounted on the other side of the turntable 8. The tensioning cylinder 10 and the turntable 8 are arranged coaxially. The air outlet of the air pump 11 is connected to the air pipe 12. The end of the air pipe 12 away from the air pump 11 passes through the turntable 8 and the tensioning cylinder 10 and extends into the interior of the tensioning cylinder 10. An air bladder 13 is provided inside the tensioning cylinder 10. The air bladder 13 is connected to the air pipe 12. Several inner top plates 14 are attached to the outer surface of the air bladder 13. Several sliding columns 15 are fixedly installed on the side of the inner top plate 14 away from the air bladder 13. Several receiving grooves are opened on the outer surface of the tensioning cylinder 10, and an outer tensioning plate 16 is provided in the receiving groove. The sliding column 15 is slidably installed on the tensioning cylinder 10, and the end of the sliding column 15 away from the inner top plate 14 is fixedly connected to the outer tensioning plate 16.
[0028] By using a bidirectional screw 4 in conjunction with a threaded plate 5, a mounting bracket 6, a support side plate 7, a turntable 8, and a tensioning cylinder 10, the rotation of the bidirectional screw 4 enables the relative movement of the two tensioning cylinders 10, allowing them to penetrate deep into both ends of the workpiece. The air pump 11 inflates the airbag 13, which in turn drives the inner top plate 14 to move the outer tensioning plate 16 outward via the sliding column 15, achieving a self-centering tensioning and fixing effect on the workpiece. This provides excellent fixing and avoids the deformation that can easily occur when traditional clamps are used on the outside of the workpiece. The turntable 8, in conjunction with a handle 9 and a insertion rod 18, locks when the insertion rod 18 disengages from the slot. This allows for rotational adjustment of the workpiece after tensioning and clamping. After adjustment, the insertion rod 18 is inserted into the slot to lock, achieving angle adjustment of the workpiece. Furthermore, the tensioning cylinder 10, in conjunction with a long screw 23, allows the user to select the appropriate position of the outer tensioning plate 16 based on the workpiece's end deformation.
[0029] Several guide bars 17 are fixedly installed on the inner wall of the mounting frame 1. Several guide grooves are opened on the surface of the threaded plate 5. The guide bars 17 and the guide grooves work together. By setting the guide bars 17 and the guide grooves to work together, when the bidirectional screw 4 rotates to drive the threaded plate 5 to move, the threaded plate 5 will slide on the surface of the guide bars 17 through the guide grooves, thereby ensuring the smooth movement of the threaded plate 5.
[0030] The handle 9 has an internal cavity. A rod 18 is slidably installed on the handle 9 in front of the cavity. A pull ring 19 is fixedly installed on one end of the rod 18. Several slots are opened on the side of the support plate 7. The other end of the rod 18 is used in conjunction with the slot. The rod 18 is used in conjunction with the pull ring 19. When the rod 18 is disengaged from the slot, the turntable 8 is unlocked and can be rotated. After the turntable 8 is rotated, the rod 18 is inserted into the slot to lock the turntable 8.
[0031] A limiting ring 20 is fixedly installed on the outside of the insertion rod 18. The limiting ring 20 is located inside the cavity, and a spring 21 is fixedly installed between the limiting ring 20 and the inner wall of the cavity. The limiting ring 20 works in conjunction with the spring 21. When the insertion rod 18 is disengaged from the slot, the spring 21 deforms. Therefore, the elastic force of the spring 21 can drive the insertion rod 18 to quickly return to the slot and be inserted into it, achieving convenient locking. The setting of the limiting ring 20 can play a limiting role and prevent the insertion rod 18 from disengaging from the handle 9 when it moves.
[0032] A second spring 22 is provided on the outer surface of the sliding column 15. The two ends of the second spring 22 are fixedly connected to the inner top plate 14 and the inner wall of the tensioning cylinder 10, respectively. When the airbag 13 inflates and drives the inner top plate 14 to move outward, the inner top plate 14 drives the sliding column 15 to move. At this time, the second spring 22 deforms. Therefore, when the airbag 13 deflates, the elastic force of the second spring 22 can be used to drive the outer tensioning plate 16 to quickly reset, improving the convenience of structural movement.
[0033] A long screw 23 is threadedly installed on the side of the tensioning cylinder 10, directly opposite the receiving groove. The outer tensioning plate 16 has a threaded groove for the long screw 23 to be screwed in. By setting the long screw 23, the user can select the number of outer tensioning plates 16 to use according to the shape of the workpiece. For example, the long screw 23 at the deformed position of the workpiece can be screwed in. At this time, the outer tensioning plate 16 at the position will not move outward due to the inflation of the airbag 13, thus achieving a good protective effect.
[0034] In use, the mounting frame 1 is installed using the mounting plate 2 and mounting bolts 3. The workpiece is placed between the two supporting side plates 7, and both ends of the workpiece are aligned with the two tensioning cylinders 10. The appropriate number of external tensioning plates 16 is selected based on the workpiece end deformation. For example, the long screws 23 aligned with the tensioning cylinders 10 at the workpiece end deformation location are tightened, preventing the external tensioning plates 16 at this location from moving. Then, the handwheel is turned to drive the double-acting screw 4, which in turn drives the two threaded plates 5 closer together. This, in turn, drives the mounting brackets 6 on both sides to bring the supporting side plates 7 closer together, thus bringing the two tensioning cylinders 10 closer together. Insert the components into both ends of the workpiece. After insertion, stop turning the handwheel and start the air pump 11. When the air pump 11 is working, gas enters the air bag 13. The air bag 13 inflates, which drives the inner top plate 14 to move the sliding column 15 outward, which in turn drives the outer tension plate 16 to move outward, thus achieving tight tension and fixation of the inner wall of the workpiece. During the processing, the fixed workpiece can be rotated and adjusted. When adjusting, pull the pull ring 19. The pull ring 19 drives the insertion rod 18 to disengage from the slot. At this time, the turntable 8 is unlocked. The rotation of the turntable 8 realizes the rotation of the workpiece. After rotation, release the pull ring 19 and use the spring 21 to drive the insertion rod 18 to insert into the slot to complete the locking.
Claims
1. A self-centering thin-walled tensioner characterized by: The utility model provides an installation frame (1) is provided with the installation plate (2) on four corner positions, and the installation plate (2) is provided with the installation bolt (3), and the inside of installation frame (1) is rotatably provided with the two-way screw rod (4), and the one end of two-way screw rod (4) is extended and is fixedly installed with hand wheel, and the both ends of two-way screw rod (4) are rotatably provided with the screw plate (5), and the left and right sides of screw plate (5) are fixedly installed with the mounting bracket (6), and the both ends of two-way screw rod (4) are rotatably provided with the screw plate (5), and the left and right sides of screw plate (5) are fixedly installed with the mounting bracket (6), and the both ends of two-way screw rod (4) are rotatably provided with the screw plate (5), and the left and right sides of screw plate (5) are fixedly installed with the mounting bracket (6), and the both ends of two-way screw rod (4) are rotatably provided with the screw plate (5), and the left and right sides of screw plate (5) are fixedly installed with the mounting bracket (6), and the both ends of two-way screw rod (4) are rotatably provided with the screw plate (5), and the left and right sides of screw plate (5) are fixedly installed with the mounting bracket (6), and the both ends of two-way screw rod (4) are rotatably provided with the screw plate (5), and the left and right sides of screw plate (5) are fixedly installed with the mounting bracket (6), and the both ends of two-way screw rod (4) are rotatably provided with the screw plate (5), and the left and right sides of screw plate (5) are fixedly installed with the mounting bracket (6), and the both ends of two-way screw rod (4) are rotatably provided with the screw plate (5), and the left and right sides of screw plate (5) are fixedly installed with the mounting bracket (6), and the both ends of two-way screw rod (4) are rotatably provided with the screw plate (5), and the left and right sides of screw plate (5) are fixedly installed with the mounting bracket (6), and the both ends of two-way screw rod (4) are rotatably provided with the screw plate (5), and the left and right sides of screw plate (5) are fixedly installed with the mounting bracket (6), and the both ends of two-way screw rod (4) are rotatably provided with the screw plate (5), and the left and right sides of screw plate (5) are fixedly installed with the mounting bracket (6), and the both ends of two-way screw rod (4) are rotatably provided with the screw plate (5), and the left and right sides of screw plate (5) are fixedly installed with the mounting bracket (6), and the both ends of two-way screw rod (4) are rotatably provided with the screw plate (5), and the left and right sides of screw plate (5) are fixedly installed with the mounting bracket (6), and the both ends of two-way screw rod (4) are rotatably provided with the screw plate (5), and the left and right sides of screw plate (5) are fixedly installed with the mounting bracket (6), and the both ends of two-way screw rod (4) are rotatably provided with the screw plate (5), and the left and right sides of screw plate (5) are fixedly installed with the mounting bracket (6), and the both ends of two-way screw rod (4) are rotatably provided with the screw plate (5), and the left and right sides of screw plate (5) are fixedly installed with the mounting bracket (6), and the both ends of two-way screw rod (4) are rotatably provided with the screw plate (5), and the left and right sides of screw plate (5) are fixedly installed with the mounting bracket (6), and the both ends of two-way screw rod (4) are rotatably provided with the screw plate (5), and the left and right sides of screw plate (5) are fixedly installed with the mounting bracket (6), and the both ends of two-way screw rod (4) are rotatably provided with the screw plate (5), and the left and right sides of screw plate (5) are fixedly installed with the mounting bracket (6), and the both ends of two-way screw rod (4) are rotatably provided with the screw plate (5), and the left and right sides of screw plate (5) are fixedly installed with the mounting bracket (6), and the both ends of two-way screw rod (4) are rotatably provided with the screw plate (5), and the left and right sides of screw plate (5) are fixedly installed with the mounting bracket (6), and the both ends of two-way screw rod (4) are rotatably provided with the screw plate (5), and the left and right sides of screw plate (5) are fixedly installed with the mounting bracket (6), and the both ends of two-way screw rod (4) are rotatably provided with the screw plate (5), and the left and right sides of screw plate (5) are fixedly installed with the mounting bracket (6), and the both ends of two-way screw rod (4) are rotatably provided with the screw plate (5), and the left and right sides of screw plate (5) are fixedly installed with the mounting bracket (6), and the both ends of two-way screw rod (4) are rotatably provided with the screw plate (5), and the left and right sides of screw plate (5) are fixedly installed with the mounting bracket (6), and the both ends of two-way screw rod (4) are rotatably provided with the screw plate (5), and the left and right sides of screw plate (5) are fixedly installed with the mounting bracket (6), and the both ends of two-way screw rod (4) are rotatably provided with the screw plate (5), and the left and right sides of screw plate (5) are fixedly installed with the mounting bracket (6), and the both ends of two-way screw rod (4) are rotatably provided with the screw plate (5), and the left and right sides of screw plate (5) are fixedly installed with the mounting bracket (6), and the both ends of two-way screw rod (4) are rotatably provided with the screw plate (5), and the left and right sides of screw plate (5) are fixedly installed with the mounting bracket (6), and the both ends of two-way screw rod (4) are rotatably provided with the screw plate (5), and the left and right sides of screw plate (5) are fixedly installed with the mounting bracket (6), and the both ends of two-way screw rod (4) are rotatably provided with the screw plate (5), and the left and right sides of screw plate (5) are fixedly installed with the mounting bracket (6), and the both ends of two-way screw rod (4) are rotatably provided with the screw plate (5), and the left and right sides of screw plate (5) are fixedly installed with the mounting bracket (6), and the both ends of two-way screw rod (4) are rotatably provided with the screw plate (5), and the left and right sides of screw plate (5) are fixedly installed with the mounting bracket (6), and the both ends of two-way screw rod (4) are rotatably provided with the screw plate (5), and the left and right sides of screw plate (5) are fixedly installed with the mounting bracket (6), and the both ends of two-way screw rod (4) are rotatably provided with the screw plate (5), and the left and right sides of screw plate (5) are fixedly installed with the mounting bracket (6), and the both ends of two-way screw rod (4) are rotatably provided with the screw plate (5), and the left and right sides of screw plate (5) are fixedly installed with the mounting bracket (6), and the both ends of two-way screw rod (4) are rotatably provided with the screw plate (5), and the left and right sides of screw plate (5) are fixedly installed with the mounting bracket (6), and the both ends of two-way screw rod (4) are rotatably provided with the screw plate (5), and the left and right sides of screw plate (5) are fixedly installed with the mounting bracket (6), and the both ends of two-way screw rod (4) are rotatably provided with the screw plate (5), and the left and right sides of screw plate (5) are fixedly installed with the mounting bracket (6), and the both ends of two-way screw rod (4) are rotatably provided with the screw plate (5), and the left and right sides of screw plate (5) are fixedly installed with the mounting bracket (6), and the both ends of two-way screw rod (4) are rotatably provided with the screw plate (5), and the left and right sides of screw plate (5) are fixedly installed with the mounting bracket (6), and the both ends of two-way screw rod (4) are rotatably provided with the screw plate (5), and the left and right sides of screw plate (5 2. The self-centering thin-walled tensioner of claim 1, wherein: 3. The self-centering thin-walled tensioner of claim 1, wherein: 4. The self-centering thin-walled tensioner of claim 3, wherein: 5. The self-centering thin-walled tensioner of claim 1, wherein: 6. The self-centering thin-walled tensioner of claim 1, wherein: