A slitting machine air expansion head

Abstract

This application relates to the field of slitting machine technology, and provides a slitting machine air expansion head, including a rotating shaft. The rotating shaft has a first assembly cavity and a second assembly cavity distributed radially. The first assembly cavity is sleeved on a bearing outside a fixed shaft. An inner expansion plate and an expansion block are inserted into the second assembly cavity and abutted by inclined surfaces. The inner expansion plate is fixed on a moving shaft inside the fixed shaft. The moving shaft is configured to move axially under the push of pressurized gas and push the expansion block radially out through the inner expansion plate. Based on the above structure, the rotating shaft is fixed by a combination of a bearing with a larger support surface and an inner expansion plate. Compared with the single bearing fixing method in the prior art, this reduces the probability of radial runout of the rotating shaft and improves the stability of the paper tube.

Description

Technical Field

[0001] This application relates to the field of slitting machine technology, and in particular provides a slitting machine air expansion head. Background Technology

[0002] The air inflator is a core component of the slitting machine, used to fix and support the rolled material. The air inflator's shaft is typically rotatably mounted on the outside of the fixed shaft using bearings. During winding, the shaft passes inside the paper tube and fixes it, while the shaft drives the paper tube to rotate, completing the winding process. However, due to the small support surface of the bearings and shaft, radial jump of the shaft is prone to occur, leading to poor paper tube stability and affecting winding quality. Utility Model Content

[0003] This application provides an air expansion head for a slitting machine, which aims to solve the problem of poor paper tube stability caused by the small contact area between the shaft and the bearing in the existing air expansion head.

[0004] To achieve the above objectives, this application adopts the following technical solution: A slitting machine pneumatic expansion head is provided, including a rotating shaft. The rotating shaft has a first assembly cavity and a second assembly cavity distributed radially. The first assembly cavity is sleeved on a bearing outside a fixed shaft. An inner expansion plate and an expansion block are inserted into the second assembly cavity and abutted by an inclined surface. The inner expansion plate is fixed on a moving shaft inside the fixed shaft. The moving shaft is configured to move axially under the push of pressurized gas and push the expansion block radially out through the inner expansion plate.

[0005] The air expansion head of the slitting machine provided in this application uses a combination of a bearing with a larger support surface and an inner expansion plate to fix the rotating shaft. Compared with the single bearing fixing method in the prior art, it can reduce the probability of radial runout of the rotating shaft and improve the stability of the paper tube.

[0006] In some embodiments, a compression spring is fitted onto the moving shaft inside the fixed shaft.

[0007] In some embodiments, the rotating shaft is fixedly connected to the belt shaft abutting against the inner end face of the bearing.

[0008] In some embodiments, an oil seal spring for tightening the expansion block is sleeved on the outer side of the rotating shaft.

[0009] In some embodiments, a rubber pad is provided on the outer side of the expansion block.

[0010] In some embodiments, a retaining washer is provided between the bearing and the nut on the fixed shaft.

[0011] In some embodiments, the inner expansion plate is fixedly connected to a retaining ring rotatably connected to the moving shaft.

[0012] In some embodiments, the height of the ramp decreases from the belt shaft toward the retaining ring.

[0013] In some embodiments, the inclined surfaces are spaced apart along a fixed axis.

[0014] In some embodiments, the second assembly cavities are uniformly distributed circumferentially along the axis of rotation. Attached Figure Description

[0015] Exemplary embodiments of this application will now be described in detail with reference to the accompanying drawings. It should be understood that the embodiments described below are for illustrative purposes only and are not intended to limit the scope of this application. In the accompanying drawings: Figure 1 A cross-sectional view of the air expansion head of the slitting machine provided in an embodiment of this application; Figure 2 Right view of the air expansion head of the slitting machine provided in an embodiment of this application; Figure 3 A cross-sectional view of the rotating shaft provided in an embodiment of this application; The following are the labeling elements in the figure: 10. Rotating shaft; 11. First assembly cavity; 12. Second assembly cavity; 13. Slot; 14. Inner expansion plate; 15. Inclined surface; 16. Expansion block; 17. Rubber pad; 18. Oil seal spring; 19. Belt shaft; 20. Fixed shaft; 21. Bearing; 22. Locking washer; 23. Nut; 24. Air chamber; 30. Moving shaft; 31. Sealing ring; 32. Compression spring; 33. Shaft sleeve; 34. Angular contact bearing; 35. Retaining ring; 36. Retaining ring; 37. Screw; 40. Support plate. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description of this application is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining this application and are not intended to limit this application.

[0017] The air inflator is a core component of the slitting machine, used to fix and support the rolled material. The air inflator's shaft is typically rotatably mounted on the outside of the fixed shaft using bearings. During winding, the shaft passes inside the paper tube and fixes it, while the shaft drives the paper tube to rotate, completing the winding process. However, due to the small support surface of the bearings and shaft, radial jump of the shaft is prone to occur, leading to poor paper tube stability and affecting winding quality.

[0018] Based on the above considerations, this application provides a slitting machine air expansion head, which can solve the problem of poor paper tube stability caused by the small contact area between the rotating shaft and the bearing in the prior art.

[0019] The specific implementation of this application will be described in detail below with reference to specific embodiments.

[0020] Please see Figures 1-3 An embodiment of this application provides a slitting machine air expansion head, including a rotating shaft 10. The rotating shaft 10 has a first assembly cavity 11 and a second assembly cavity 12 distributed radially. The first assembly cavity 11 is sleeved on a bearing 21 outside a fixed shaft 20. An inner expansion plate 14 and an expansion block 16 are inserted into the second assembly cavity 12 and abutted by an inclined surface 15. The inner expansion plate 14 is fixed on a moving shaft 30 inside the fixed shaft 20. The moving shaft 30 is configured to move axially under the push of pressurized gas and push the expansion block 15 radially out through the inner expansion plate 14.

[0021] The rotating shaft 10 refers to the structure used to support and fix the paper tube. The rotating shaft 10 drives the paper tube to rotate, which can rewind the slit material onto the paper tube.

[0022] The rotating shaft 10 is constructed as a hollow cylinder. The first assembly cavity 11 is a circular cavity structure arranged coaxially with the rotating shaft 10. The second assembly cavity 12 is an arc-shaped cavity structure arranged coaxially with the rotating shaft 10. The second assembly cavities 12 are evenly distributed along the circumference of the rotating shaft 10. The second assembly cavities 12 are arranged on the outer periphery of the first assembly cavity 11 and penetrate the circumferential surface of the rotating shaft 10.

[0023] The first assembly cavity 11 is fitted outside the bearing 21 and is interference-fitted with the bearing 21, so that the rotating shaft 10 as a whole can rotate relative to the fixed shaft 20.

[0024] The second assembly cavity 12 is equipped with an inner expansion plate 14 and an expansion block 16. The outer wall of the inner expansion plate 14 and the inner wall of the expansion block 16 are connected by a sliding fit through an inclined surface 15. The height of the inclined surface 15 decreases from the belt shaft 19 toward the retaining ring 35. The inclined surfaces 15 are distributed at intervals along the axial direction of the fixed shaft 20. The inner expansion plate 14 can only follow the moving shaft 30 to move axially along the rotating shaft 10, and the expansion block 16 can only move radially along the rotating shaft 10.

[0025] When the inner expansion plate 14 moves outward along the axial direction under the drive of the moving shaft 30, the expansion block 16 can be pushed outward along the radial direction by the inclined surface 15, thereby tightening it inside the paper tube and fixing the paper tube.

[0026] A groove 13 is provided on the outer wall of the expansion block 16. An oil seal spring 18 is engaged inside the groove 13. The oil seal spring 18 is circular and is sleeved on the outside of the rotating shaft 10. The oil seal spring 18 is used to clamp the expansion block 16 inside the second assembly cavity 12 and can make the expansion block 16 automatically retract into the second assembly cavity 12 after losing the push of the inner expansion plate 14, thereby releasing the paper tube.

[0027] To avoid damage to the paper tube from rigid contact, a rubber pad 17 can be fitted over the outside of the expansion block 16, which acts as a buffer.

[0028] The fixed shaft 20 refers to the structure used to fix and support the rotating shaft 10. The fixed shaft 20 is a hollow cylinder. The left end of the fixed shaft 20 is bolted to the bracket 40, and the left end face of the fixed shaft 20 is sealed to the bracket 40.

[0029] The bearing 21 is sleeved on the outside of the fixed shaft 20 and is interference-fitted with the fixed shaft 20. In order to ensure the stability of the installation position of the bearing 21, a nut 23 is screwed on the fixed shaft 20 on the right side of the bearing 21. At the same time, a retaining washer 22 is clamped between the right end face of the bearing 21 and the left end of the nut 23.

[0030] A belt shaft 19 is also fitted on the outside of the fixed shaft 20, and the right end face of the belt shaft 19 abuts against the left end face of the bearing 21. That is, the belt shaft 19 is restricted on the fixed shaft 20 by the bearing 21, and the right end face of the belt shaft 19 is bolted to the left end face of the rotating shaft 10, thereby restricting the rotating shaft 10 to the outside of the fixed shaft 20.

[0031] It should be noted that the first assembly cavity 11 of the rotating shaft 10 is provided with a step, which abuts against the right end face of the bearing 21. By using the step and the belt shaft 19 to abut against the two end faces of the bearing 20 respectively, the rotating shaft 10 can be prevented from moving axially.

[0032] The moving shaft 30 refers to the drive mechanism used to move the inner expansion plate 14. The moving shaft 30 passes through the interior of the fixed shaft 20 and is arranged coaxially with the fixed shaft 20. The left end of the moving shaft 30 is sealed to the inner wall of the fixed shaft 20 through the sealing ring 31, thereby forming an air chamber 24 at the left end face of the moving shaft 30. The air chamber 24 is connected to an external air source. After pressurized gas enters the air chamber 24, it can push the moving shaft 30 to move axially to the right.

[0033] A compression spring 32 is sleeved on the outside of the moving shaft 30. The compression spring 32 is arranged between the step inside the moving shaft 30 and the step at the left end of the moving shaft 30. The compression spring 32 is in a compressed state and is used to make the moving shaft 30 move to the left.

[0034] A bushing 33 is fitted on the right end of the moving shaft 30. An angular contact bearing 34 is fitted on the outside of the bushing 33. A retaining ring 35 is fitted on the outside of the angular contact bearing 34. The angular contact bearing 34 is restricted between the step on the left end of the outer wall of the bushing 33 and the step on the right end of the inner wall of the angular contact bearing 34. A screw 37 is screwed on the right end face of the moving shaft 30. A retaining ring 36 is fitted on the screw 37. The retaining ring 36 is pressed against the right end face of the angular contact bearing 34 by the screw 37.

[0035] The retaining ring 35 is arranged inside the rotating shaft 10. Specifically, the retaining ring 35 is arranged on the right side of the first assembly cavity 11. The left end face of the retaining ring 35 is bolted to the inner expansion plate 14. The retaining ring 35 is used to drive the inner expansion plate 14 to move axially.

[0036] When pressurized gas enters the gas chamber 14, the moving shaft 30 will move axially to the right under the push of the pressurized gas, which will further compress the compression spring 32 and drive the bushing 33, angular contact bearing 34, retaining ring 35, retaining ring 36, screw 37 and inner expansion plate 14 to move synchronously to the right. At this time, the inclined plane 15 can be used to push the expansion block 16 to move radially outward, thereby completing the fixation of the paper tube.

[0037] The air expansion head of the slitting machine provided in this application uses a combination of a bearing 21 with a larger support surface and an inner expansion plate 15 to fix the rotating shaft 10. Compared with the single bearing fixing method in the prior art, it can reduce the probability of radial runout of the rotating shaft and improve the stability of the paper tube.

[0038] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A slitting machine air expansion head, characterized in that, The device includes a rotating shaft having a first assembly cavity and a second assembly cavity distributed radially. The first assembly cavity is fitted onto a bearing outside a fixed shaft. An inner expansion plate and an expansion block are inserted into the second assembly cavity and abutted by an inclined surface. The inner expansion plate is fixed to a moving shaft inside the fixed shaft. The moving shaft is configured to move axially under the push of pressurized gas and push the expansion block radially out through the inner expansion plate.

2. The air expansion head of the slitting machine according to claim 1, characterized in that, A compression spring is fitted onto the moving shaft inside the fixed shaft.

3. The air expansion head of the slitting machine according to claim 2, characterized in that, The rotating shaft is fixedly connected to the belt shaft that abuts against the inner end face of the bearing.

4. The air expansion head of the slitting machine according to claim 3, characterized in that, An oil seal spring for tightening the expansion block is fitted on the outer side of the rotating shaft.

5. The air expansion head of the slitting machine according to claim 4, characterized in that, A rubber pad is fitted on the outside of the expansion block.

6. The air expansion head of the slitting machine according to claim 5, characterized in that, A retaining washer is provided between the bearing and the nut on the fixed shaft.

7. The air expansion head of the slitting machine according to claim 6, characterized in that, The inner expansion plate is fixedly connected to the retaining ring rotatably connected to the moving shaft.

8. The air expansion head of the slitting machine according to claim 7, characterized in that, The height of the inclined plane decreases from the belt shaft toward the retaining ring.

9. The air expansion head of the slitting machine according to claim 8, characterized in that, The inclined surfaces are spaced apart along the axial direction of the fixed axis.

10. The air expansion head of the slitting machine according to claim 9, characterized in that, The second assembly cavity is evenly distributed circumferentially along the axis of rotation.

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