A mechanical expansion shaft

Abstract

This utility model discloses a mechanical expansion shaft, including a fixed base, a take-up shaft, two sets of expansion components, a spacer, and a drive assembly mounted on the take-up shaft. The fixed base is mounted on a frame, and the take-up shaft is rotatably mounted on the fixed base. The two sets of expansion components are respectively located on both sides of the spacer. One set of expansion components is fixedly connected to the take-up shaft, and the other set is slidably connected to the take-up shaft. The drive assembly controls the radial expansion of the expansion components. This utility model uses two sets of expansion components in conjunction with the drive assembly. The expansion components have an inclined surface fit, allowing the expansion member to expand radially. The drive assembly provides driving force, converting the axial driving force into a radial expansion force, thus expanding the expansion member to fix the core. The operation is simple and convenient. The adjusting sleeve and the inner ring of the adjusting sleeve are threaded together, converting the rotational force into an axial driving force, further simplifying the operation. Moreover, the inner ring of the adjusting sleeve is fixed by a tightening screw, which can be fixed at any position on the take-up shaft, making operation convenient.

Description

Technical Field

[0001] This utility model relates to the field of winding technology, and in particular to a mechanical expansion shaft. Background Technology

[0002] A slitting machine (or slitting machine) is a device that cuts a roll of material into multiple rolls, and its applications are very wide. Mechanical tensioners are typically used on the take-up shaft of a slitting machine. Currently, there are various types of mechanical tensioners on the market for use in take-up operations. Existing mechanical tensioners have two clamps on the left and right sides of the take-up shaft, with a top block fixed to the shaft. A spring is placed between the top block and one of the clamps, and the spring force clamps the core between the two clamps. However, this method requires manual pushing of the top block to fix it, and the clamping force on the core cannot be controlled, and installation is inconvenient. Utility Model Content

[0003] To address the shortcomings of the existing technology, the main objective of this utility model is to overcome these deficiencies by disclosing a mechanical expansion shaft, comprising a fixed base, a take-up shaft, two sets of expansion components, a spacer, and a drive assembly disposed on the take-up shaft. The fixed base is mounted on a frame, and the take-up shaft is rotatably disposed on the fixed base. The two sets of expansion components are disposed on both sides of the spacer. One set of expansion components is fixedly connected to the take-up shaft, and the other set of expansion components is slidably connected to the take-up shaft. The drive assembly controls the radial expansion of the expansion components.

[0004] Furthermore, the expansion assembly includes a first chuck, a second chuck, and an expansion member. The first chuck and the second chuck are provided with shaft holes that mate with the take-up shaft. The first chuck is provided with a driving part, and the second chuck is provided with an oblique guide part that guides the expansion member to expand radially.

[0005] Furthermore, a limiting part is provided at the end of the inclined guide with a smaller diameter.

[0006] Furthermore, the expansion member is a ring spring.

[0007] Furthermore, the drive assembly includes an adjusting sleeve inner ring and an adjusting sleeve. The adjusting sleeve inner ring is sleeved on the take-up shaft, and the adjusting sleeve is disposed on the adjusting sleeve inner ring, with the adjusting sleeve threadedly engaging with the adjusting sleeve inner ring.

[0008] Furthermore, the inner ring of the adjusting sleeve is fixed to the winding shaft by a tightening screw.

[0009] Furthermore, the drive assembly also includes a front limiting sleeve and a rear limiting sleeve, which limit the axial movement range of the adjusting sleeve.

[0010] Furthermore, a slot is provided on the take-up shaft, and a first retaining spring is provided in the slot to limit the front limiting sleeve.

[0011] Furthermore, the rear limiting sleeve is fitted onto the inner ring of the adjusting sleeve, and the rear limiting sleeve is fixed to the inner ring of the adjusting sleeve by a tightening screw.

[0012] Furthermore, the mounting base includes a flange, a bearing, a second snap ring, and a nut. The second snap ring is fixed on the winding shaft, the flange is mounted on the winding shaft via the bearing, the nut is threaded into the winding shaft, the nut acts on the bearing, and provides axial thrust to the bearing.

[0013] The beneficial effects achieved by this utility model are as follows:

[0014] This invention utilizes two sets of expansion components in conjunction with a drive component. The expansion components feature an inclined surface, allowing the expansion element to expand radially. The drive component provides driving force, converting axial driving force into radial expansion force, thus expanding the expansion element to secure the core. Operation is simple and convenient. The adjusting sleeve and its inner ring are threaded together, converting rotational force into axial driving force, further simplifying operation. Furthermore, the inner ring of the adjusting sleeve is secured by a tightening screw, allowing it to be fixed at any position on the winding shaft, ensuring convenient operation. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of a mechanical expansion shaft according to the present invention;

[0016] Figure 2 This is a cross-sectional view of a mechanical expansion shaft according to the present invention;

[0017] Figure 3 for Figure 2 Enlarged view of A in the middle;

[0018] The attached figures are labeled as follows:

[0019] 1. Fixed base, 2. Rewinding shaft, 3. Expansion assembly, 4. Spacer, 5. Drive assembly, 6. Third snap ring, 9. Core tube, 11. Flange, 12. Bearing, 13. Second snap ring, 14. Nut, 21. Slot, 22. First snap ring, 31. First chuck, 32. Second chuck, 33. Expansion piece, 311. Drive unit, 312. Third screw hole, 321. Inclined guide unit, 322. Limiting unit, 51. Inner ring of adjusting sleeve, 52. Adjusting sleeve, 53. Front limiting sleeve, 54. Rear limiting sleeve, 511. First screw hole, 541. Second screw hole. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0021] A type of mechanical expansion shaft, such as Figures 1-3 As shown, it includes a fixed base 1, a take-up shaft 2, and two sets of expansion components 3, a spacer 4, and a drive assembly 5 disposed on the take-up shaft 2. The fixed base 1 is mounted on the frame, and the take-up shaft 2 is rotatably mounted on the fixed base 1. The two sets of expansion components 3 are disposed on both sides of the spacer 4. One set of expansion components 3 is fixedly connected to the take-up shaft 2, and the other set of expansion components 3 is slidably connected to the take-up shaft 2. The drive assembly 5 controls the radial expansion of the expansion components 3.

[0022] In one embodiment, such as Figures 1-3 As shown, the expansion assembly 3 includes a first chuck 31, a second chuck 32, and an expansion member 33. The first chuck 31 and the second chuck 32 have shaft holes that mate with the winding shaft 2. The first chuck 31 has a drive unit 311, and the second chuck 32 has a guide unit 321 that guides the expansion member 33 to expand radially. The drive unit 311 acts on the expansion member 33. When the expansion member 33 is pushed by the first chuck 31, it moves axially on the guide unit 321, thereby guiding the expansion member 33 to expand radially and press against the inner wall of the core 9, thus fixing the core 9 to the mechanical expansion shaft. The guide unit 321 has a frustum-shaped structure.

[0023] In the above embodiments, such as Figures 1-3 As shown, a limiting part 322 is provided at the end of the inclined guide portion 321 with a smaller diameter. The limiting part 322 prevents the expansion member 33 from slipping off the second chuck 32; even when there is no axial driving force from the first chuck 31, the expansion member 33 is blocked by the limiting part 322 and is always assembled at the second chuck 32. Preferably, the limiting part 322 has a chamfer at the end near the first chuck.

[0024] In one embodiment, such as Figures 1-3 As shown, the expansion member 33 is a circular spring, which is formed by spirally winding steel wire.

[0025] In one embodiment, such as Figures 1-3 As shown, the drive assembly 5 includes an adjusting sleeve inner ring 51 and an adjusting sleeve 52. The adjusting sleeve inner ring 51 is sleeved on the take-up shaft 2, and the adjusting sleeve 52 is disposed on the adjusting sleeve inner ring 51, with the adjusting sleeve 52 threadedly engaging with the adjusting sleeve inner ring 51. The adjusting sleeve inner ring 51 can be fixedly installed at any position on the take-up shaft 2 as required, and the axial movement of the adjusting sleeve 52 can be achieved by rotating the adjusting sleeve 52.

[0026] In the above embodiments, such as Figures 1-3As shown, the inner ring 51 of the adjusting sleeve is fixed to the take-up shaft 2 by a tightening screw. The inner ring 51 of the adjusting sleeve is provided with a first screw hole 511 in the radial direction. The tightening screw is threaded into the first screw hole 511, and the tightening screw is pressed tightly against the take-up shaft 2 to fix the inner ring 51 of the adjusting sleeve to the take-up shaft 2.

[0027] In the above embodiments, such as Figures 1-3 As shown, the drive assembly 5 also includes a front limiting sleeve 53 and a rear limiting sleeve 54, which limit the axial movement range of the adjusting sleeve 52. This prevents the adjusting sleeve 52 from rotating excessively and causing separation between the adjusting sleeve 52 and the adjusting sleeve 51.

[0028] In one embodiment, such as Figures 1-3 As shown, a slot 21 is provided on the take-up shaft 2, and a first retaining spring 22 is provided in the slot 21. The first retaining spring 22 is used to limit the front limiting sleeve 53. After the first retaining spring 22 is engaged in the corresponding slot 21, its position is fixed. The front limiting position can be adjusted by replacing the front limiting sleeve 53 with a different obstruction. Multiple slots 21 can be provided at intervals on the take-up shaft to adjust the front limiting position according to the length of the tube.

[0029] In one embodiment, such as Figures 1-3 As shown, the rear limiting sleeve 54 is fitted onto the inner ring 51 of the adjusting sleeve, and the rear limiting sleeve 54 is fixed to the inner ring 51 of the adjusting sleeve by a tightening screw. The rear limiting sleeve 54 is provided with a second screw hole 541 in the radial direction. The tightening screw is threaded into the second screw hole, thereby using the tightening screw to press tightly against the inner ring 51 of the adjusting sleeve, thus fixing the rear limiting sleeve 54.

[0030] In one embodiment, such as Figures 1-3 As shown, the mounting base 1 includes a flange 11, a bearing 12, a second retaining ring 13, and a nut 14. The second retaining ring 13 is fixed to the take-up shaft 2. The flange 11 is mounted on the take-up shaft 2 via the bearing 12. The nut 14 is threaded into the take-up shaft 2 and acts on the bearing 12, providing axial thrust. In this embodiment, two bearings 12 are provided, spaced apart. One bearing is pressed against the second retaining ring 13, and the nut 14 acts on the other bearing, thus axially fixing the bearing 12. The flange 11 is rotatably connected to the take-up shaft 2 via the bearing 12. The flange is fixed to the frame.

[0031] In one embodiment, such as Figures 1-3 As shown, the spacer 4 is made of nylon tubing, iron tubing, or stainless steel tubing; preferably, the spacer is made of nylon tubing. The function of the spacer 4 is to limit the distance between the two sets of expansion components 3 to accommodate cores 9 of different lengths. Nylon tubing is used to facilitate the cutting of the spacer 4.

[0032] In one embodiment, such as Figures 1-3As shown, a set of expansion components 3 is fixedly installed, with a third screw hole 312 provided on the first chuck 31. The first chuck 31 is fixed to the winding shaft 2 by a tightening screw. Preferably, a third retaining spring 6 is also provided to limit the first chuck 31 on the fixed side, so as to prevent the core 9 from loosening due to the tightening screw.

[0033] When using the mechanical expansion shaft of this utility model, such as Figures 1-3 As shown, the drive assembly 5 is installed in the position on the take-up shaft 2. Then, the core 9 is fitted onto the expansion assembly 3. Rotating the adjusting sleeve 52 converts the rotational motion into an axial motion. The adjusting sleeve 52 pushes the movable first chuck 31 towards the second chuck 32. During this process, the expansion member 33 expands radially. Simultaneously, the second chuck 32 on the fixed side moves towards the first chuck 31 on the fixed side under the action of the spacer 4, causing the expansion member 33 on the fixed side to expand radially. This continues until the adjusting sleeve 52 contacts the front limit sleeve 53, at which point the adjusting sleeve 52 can no longer move forward axially. The expansion member 33 presses against the inner wall of the core 9, thereby fixing the core 9.

[0034] Once the mandrel 9 is wound, simply rotate the adjusting sleeve 52 in the opposite direction. The adjusting sleeve 52 moves axially in the opposite direction, and the expansion assembly 3 is no longer subject to axial driving force. At this point, the expansion member 33 loosens from the inner wall of the mandrel 9, and the mandrel 9 can be pulled out axially. In addition, the expansion member 33 has its own restoring force, which will assist in the separation of the first chuck 31 and the second chuck 32.

[0035] The number of rotations of the adjusting sleeve 52 is related to the thread pitch of the adjusting sleeve 52 and the inner ring 51 of the adjusting sleeve. Typically, the adjusting sleeve 52 is set to rotate half a turn or one turn to fix the core 9 of the mechanical expansion shaft.

[0036] The above are merely preferred embodiments of the present utility model and are not intended to limit the scope of implementation of the present utility model. Any modifications or equivalent substitutions to the present utility model without departing from the spirit and scope thereof should be covered within the protection scope of the claims of the present utility model.

Claims

1. A mechanical riser, characterized in that, The device includes a fixed base, a take-up shaft, two sets of expansion components, a spacer, and a drive assembly mounted on the take-up shaft. The fixed base is mounted on a frame, and the take-up shaft is rotatably mounted on the fixed base. The two sets of expansion components are respectively located on both sides of the spacer. One set of expansion components is fixedly connected to the take-up shaft, and the other set of expansion components is slidably connected to the take-up shaft. The drive assembly controls the radial expansion of the expansion components.

2. A mechanical riser according to claim 1, wherein, The expansion assembly includes a first chuck, a second chuck, and an expansion member. The first chuck and the second chuck are provided with shaft holes that mate with the take-up shaft. The first chuck is provided with a driving part, and the second chuck is provided with an oblique guide part that guides the expansion member to expand radially.

3. A mechanical expansion shaft according to claim 2, characterized in that, A limiting part is provided at the end of the inclined guide with a smaller diameter.

4. A mechanical riser according to claim 3, wherein, The expansion component is a ring spring.

5. A mechanical riser as defined in claim 1, wherein, The drive assembly includes an adjusting inner ring and an adjusting sleeve. The adjusting inner ring is sleeved on the take-up shaft, and the adjusting sleeve is disposed on the adjusting inner ring, with the adjusting sleeve threadedly engaging with the adjusting inner ring.

6. A mechanical hinge according to claim 5, wherein, The inner ring of the adjusting sleeve is fixed to the winding shaft by a tightening screw.

7. A mechanical hinge according to claim 5, wherein, The drive assembly also includes a front limiting sleeve and a rear limiting sleeve, which limit the axial movement range of the adjusting sleeve.

8. A mechanical riser according to claim 7, wherein, The take-up shaft is provided with a slot, and a first retaining spring is provided in the slot to limit the front limiting sleeve.

9. A mechanical riser as defined in claim 7, wherein, The rear limiting sleeve is fitted onto the inner ring of the adjusting sleeve, and the rear limiting sleeve is fixed to the inner ring of the adjusting sleeve by a tightening screw.

10. A mechanical hinge according to claim 1, wherein, The mounting base includes a flange, a bearing, a second retaining ring, and a nut. The second retaining ring is fixed on the winding shaft. The flange is mounted on the winding shaft via the bearing. The nut is threaded into the winding shaft and acts on the bearing, providing axial thrust to the bearing.

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