Expansion shaft

Abstract

The utility model belongs to the technical field of coiled material winding and unwinding, and particularly relates to an expansion shaft. According to the expansion shaft, by means of the design of the rigid telescopic mechanism and the expansion piece matched with the deformation ring groove of the telescopic mechanism, the pressure applied to the inner wall of the coiled material barrel core by the expansion piece is annularly and uniformly distributed; the problems of uneven pressure, aggravated abrasion, coiled material deformation, unstable expansion and the like possibly existing in the coiled material fixing process of a traditional air expansion shaft are successfully solved, efficient, balanced and moderate expansion of a coiled material cylinder core is achieved, and the service life of equipment, the coiled material quality and operation safety and stability are effectively guaranteed.

Description

Technical Field

[0001] The present application belongs to the technical field of coiled material winding and unwinding, and specifically relates to an expansion shaft. Background Art

[0002] Coil refers to the material that is wound into a roll on a winding core for storage. In the operation of winding and unwinding coils, air shafts are widely used as a key device. Air shafts, also known as inflatable shafts or pneumatic shafts, are devices that expand the shaft radially by inflating the inside, thereby generating a strong tightening force on the coil core.

[0003] Taking the patent with announcement number CN209143400U as an example, the patent discloses a design for automated loading and unloading of an inflatable shaft. This inflatable shaft mainly includes a cylinder, a built-in expansion tube, and a telescopic boss structure arranged on the cylinder. Among them, the telescopic boss is specially designed with an arc-shaped plate connected to the surface of the expansion tube. This structure enables the telescopic boss to be effectively driven to extend outward in the radial direction synchronously when the expansion tube expands under the action of high-pressure gas. The extended boss fits precisely with the inner wall of the coil core, which enhances the expansion effect on the coil core. In actual use, once the coil needs to be released or the core needs to be replaced, it is only necessary to deflate the air through the air nozzle on the inflatable shaft. As the internal pressure of the expansion tube drops, the expansion tube quickly shrinks to its original size. At the same time, the telescopic boss linked to it will also quickly retract after losing the air pressure support, thereby releasing the expansion state of the coil core.

[0004] In the above patent, the expansion tube is a key component of the inflatable shaft, and the uniformity of the gas distribution inside it directly affects the expansion effect of the shaft. When the gas distribution inside the expansion tube is uneven, it may cause the expansion degree of each part of the expansion tube to be different, and then the telescopic boss connected to it cannot protrude evenly. This uneven protrusion will not only weaken the effective expansion and positioning ability of the inflatable shaft on the coil core, but may also cause uneven pressure distribution on the contact surface between the shaft and the core, causing local overpressure or underpressure, and increasing the risk of equipment operation, such as coil slippage, core wear, shaft fatigue and other problems. Utility Model Content

[0005] The purpose of this application is to provide a tightening shaft with good coil tightening effect, which is specifically achieved through the following technical solutions:

[0006] A tensioning shaft comprises: a central shaft, one end of which is sleeved with a telescopic mechanism for telescoping along the axial direction of the central shaft, the outer periphery of the telescopic mechanism being provided with a deformation ring groove which changes in width as the telescopic mechanism telescopes; the tensioning shaft also comprises a tensioning member which cooperates with the deformation ring groove to thereby expand the core of the coil, and a power mechanism for driving the telescopic mechanism to telescope.

[0007] When the telescopic mechanism undergoes telescopic movement driven by the power mechanism, the width of the deformation ring groove on the telescopic mechanism changes accordingly. When the width of the deformation ring groove becomes narrower, the tensioning member abuts against the inner wall of the coil core, increasing the friction between the two, thereby achieving expansion of the coil core. At this time, the pressure applied by the tensioning member to the inner wall of the coil core is evenly distributed in a ring shape, thereby avoiding damage to the coil core or unstable expansion caused by excessive or insufficient local pressure. When the width of the deformation ring groove becomes wider, the tensioning member moves away from the inner wall of the core, and there is no contact between the two, thereby achieving relaxation of the coil core.

[0008] Preferably, the expansion member is a component with elastic deformation capability, which can be exemplified by a tension spring or annular elastic rubber connected end to end. When the deformation ring groove changes in width, the expansion member cooperates with it to expand or retract. When the expansion member expands out of the deformation ring groove and abuts against the inner wall of the core, the coil core can be expanded; when the expansion member retracts to expand and relax the coil core. When the expansion member retracts into the deformation ring groove, the coil core can be relaxed.

[0009] Preferably, the telescopic mechanism comprises a plurality of bearings which are sequentially sleeved on the central axis, and the deformation annular groove is formed between two adjacent bearings.

[0010] Preferably, the telescopic mechanism further comprises an adjusting member for cooperating with the power mechanism to adjust the width of the deformation ring groove.

[0011] Preferably, the power mechanism includes a cylinder arranged on a bearing end surface close to the other end of the central axis.

[0012] Preferably, one end of the adjusting member passes through the bearing and is connected to the piston of the cylinder, and the other end of the adjusting member is provided with a limit chuck for preventing the bearing away from the cylinder from falling off. Therefore, the adjusting member can connect the bearings in series to form the telescopic main part of the telescopic mechanism, and can adjust the width of the deformation ring groove between the bearings by the power of the cylinder after being connected to the cylinder piston.

[0013] Preferably, a connecting air pipe which is connected to the cylinder is provided inside the central shaft, and the air pipe is used to inflate and deflate the cylinder.

[0014] Preferably, the bearing comprises end bearings arranged at both axial ends of the telescopic mechanism, and a connecting bearing arranged between the end bearings.

[0015] Preferably, the end bearing is recessed on one side close to the connecting bearing to form a connecting surface for connecting with the tightening member, and the connecting bearing is provided with a limiting surface partially connected to the connecting surface.

[0016] Preferably, the connection surface includes an arc segment, and a smooth segment arranged near one end of the connection bearing and connected to the arc segment; the limiting surface is in sliding connection with the smooth segment.

[0017] The matching structure of the end bearing and the connecting bearing can make the width adjustment smoother and more stable.

[0018] Compared with the prior art, this application has the following beneficial effects:

[0019] The expansion shaft of the present application, by virtue of its rigid telescopic mechanism and the design of the expansion piece that cooperates with the deformation ring groove of the telescopic mechanism, makes the pressure applied by the expansion piece to the inner wall of the coil core be evenly distributed in a ring shape, successfully solving the problems of uneven pressure, increased wear, coil deformation and unstable fixation that may exist in the traditional expansion tube air shaft in the coil fixation, achieving efficient, balanced and moderate expansion of the coil core, and effectively ensuring the equipment life, coil quality, and operation safety and stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to clearly illustrate the embodiments, the following is a brief introduction to the accompanying drawings:

[0021] Figure 1 It is a schematic diagram of the structure of the expansion shaft in the embodiment;

[0022] Figure 2 is a cross-sectional view of the expansion shaft in the embodiment;

[0023] Figure numbers: 100, center axis, 101, connecting air pipe, 200, telescopic mechanism, 210, deformation ring groove, 220, expansion piece, 230, adjusting piece, 231, limit chuck, 240 end bearing, 241, connecting surface, 250, connecting bearing, 251, limit surface, 300, power mechanism. DETAILED DESCRIPTION

[0024] The utility model is further described below in conjunction with the drawings and specific embodiments of the specification. A person of ordinary skill in the art will be able to implement the utility model based on these descriptions. In addition, the embodiments of the utility model involved in the following description are usually only embodiments of a part of the utility model, rather than all of the embodiments. Therefore, based on the embodiments in the utility model, all other embodiments obtained by a person of ordinary skill in the art without making creative work should fall within the scope of protection of the utility model. Example

[0025] See also Figure 1 , 2 , this embodiment discloses a tensioning shaft, comprising:

[0026] The central shaft 100, one end of which is sleeved with a telescopic mechanism 200 for telescoping along the axial direction of the central shaft 100. The telescopic mechanism 200 includes an end bearing 240, a connecting bearing 250 and another end bearing 240 which are sleeved on one end of the central shaft 100 in sequence. The deformation annular groove 210 is formed between two adjacent bearings, and a tightening member 220 for tightening the inner wall of the coiled material cylinder is arranged in the deformation annular groove 210. In principle, the tightening member 220 can be any component with elastic deformation ability, such as a tension spring or annular rubber connected end to end, but the tightening member 220 in this embodiment is a tension spring connected end to end. Different from the previous method of tightening the coil core by the fluctuation of air pressure inside the airbag, this embodiment provides a rigid coil core tightening shaft, which uses the telescopic movement of the telescopic mechanism 200 to change the width of the deformation ring groove 210, and then adjusts the expansion or retraction state of the tightening member 220 in the deformation ring groove 210 to achieve the expansion and relaxation of the coil core. This scheme can make the pressure applied by the tightening member 220 to the inner wall of the coil core uniformly distributed in an annular shape, avoiding damage to the coil core or unstable expansion caused by excessive or insufficient local pressure. In addition, by adjusting the expansion amount of the telescopic mechanism 200, the width of the deformation ring groove 210 can be changed, thereby changing the degree of expansion of the tightening member 220 to adapt to coils of different thicknesses, materials, and weights, which greatly improves the versatility of the equipment and reduces production costs.

[0027] The power mechanism 300 is used to drive the telescopic mechanism 200 to extend and retract. In this embodiment, the power mechanism 300 is a cylinder, which is installed on the end face of the end bearing 240 near the other end of the central axis 100. In order to ensure that the expansion shaft has sufficient power, the cylinders are arranged in two groups in this embodiment and are symmetrically distributed relative to the central axis 100. A connecting air pipe 101 is provided inside the central axis 100 and is connected to the cylinder. This embodiment uses a cylinder as a power source because it has the advantages of fast response speed, large output force, and convenient control. It can quickly and accurately drive the telescopic mechanism 200 to perform telescopic movement, ensuring a fast response and stable control of the expansion or relaxation of the coil core.

[0028] The telescopic mechanism 200 also includes an adjusting member 230 for connecting the three bearings in series. In this embodiment, the adjusting member 230 is a semi-fixed screw, one end of which passes through the three bearings in sequence, and the threaded portion of the semi-fixed screw is connected to the piston of the cylinder; the other end is provided with a limit chuck 231 for preventing the end bearing 240 from falling off. In this embodiment, the adjusting member 230 is used to connect the bearings in series to form the telescopic main body of the telescopic mechanism 200, and is connected to the cylinder piston to adjust the width of the deformation ring groove 210 between the bearings. Specifically, when the cylinder drives the adjusting member 230 to move away from the cylinder, the fixing constraint force of the adjusting member 230 on the three bearings gradually decreases. At this time, the width of the deformation ring groove 210 between the bearings becomes larger, and the expansion member 220 can be fully or mostly retracted into the deformation ring groove 210 to achieve relaxation of the coil core; on the contrary, when the cylinder drives the adjusting member 230 to move closer to the cylinder, the fixing constraint force of the adjusting member 230 on the three bearings gradually increases. At this time, the width of the deformation ring groove 210 between the bearings becomes narrower, and the expansion member 220 is squeezed and expanded out of the deformation ring groove 210, thereby expanding and fixing the inner wall of the coil tube.

[0029] In addition, considering the smoothness and stability of the width adjustment of the deformation ring groove 210, in this embodiment, the two end bearings 240 are indented near the connecting bearing 250 to form a connecting surface 241 for connecting with the expansion member 220; accordingly, the connecting bearing 250 is provided with a limiting surface 251 partially connected with the connecting surface 241. Further, the connecting surface 241 includes an arc segment and a smooth segment arranged near one end of the connecting bearing 250 and connected with the arc segment; the limiting surface 251 is slidably connected with the smooth segment. By providing the connecting surface 241 (including the arc segment and the smooth segment) and the limiting surface 251 between the end bearing 240 and the connecting bearing 250, the smoothness and stability of the width adjustment of the deformation ring groove 210 are achieved, the friction and wear are reduced, the structure is simplified, and the reliability of the equipment is improved, which is of great significance for improving the working performance and service life of the expansion shaft.

Claims

1. A tensioning shaft, characterized in that: include: A central shaft (100), one end of the central shaft (100) being sleeved with a telescopic mechanism (200) for telescoping along the axial direction of the central shaft (100), the outer periphery of the telescopic mechanism (200) being provided with a deformation annular groove (210) which changes in width as the telescopic mechanism (200) telescopes; the expansion shaft further comprising an expansion member (220) which cooperates with the deformation annular groove (210) to thereby expand and tighten the coil core, and a power mechanism (300) for driving the telescopic mechanism (200) to telescope.

2. A tensioning shaft according to claim 1, characterized in that: The expansion member (220) is a component having elastic deformation capability.

3. The expansion shaft according to claim 1, characterized in that: The telescopic mechanism (200) comprises a plurality of bearings which are sequentially sleeved on the central shaft (100), and the deformation annular groove (210) is formed between two adjacent bearings.

4. A tensioning shaft according to claim 3, characterized in that: The telescopic mechanism (200) further comprises an adjusting member (230) for cooperating with the power mechanism (300) to adjust the width of the deformation ring groove (210).

5. The expansion shaft according to claim 4, characterized in that: The power mechanism (300) comprises a cylinder arranged on a bearing end surface close to the other end of the central shaft (100).

6. The expansion shaft according to claim 5, characterized in that: One end of the adjusting member (230) passes through the bearing and is connected to the piston of the cylinder, and the other end of the adjusting member (230) is provided with a limiting chuck (231) for preventing the bearing on the side away from the cylinder from falling off.

7. The expansion shaft according to claim 5, characterized in that: A connecting air pipe (101) which is connected to the cylinder is provided inside the central shaft (100).

8. The expansion shaft according to claim 3, characterized in that: The bearing comprises end bearings (240) arranged at two axial ends of the telescopic mechanism (200), and a connecting bearing (250) arranged between the end bearings.

9. The expansion shaft according to claim 8, characterized in that: A connecting surface (241) for connecting with the tightening member (220) is formed inwardly on one side of the end bearing (240) close to the connecting bearing (250), and the connecting bearing (250) is provided with a limiting surface (251) partially connected to the connecting surface (241).

10. The expansion shaft according to claim 9, characterized in that: The connection surface (241) comprises an arc segment and a smooth segment arranged near one end of the connection bearing (250) and connected to the arc segment; the limiting surface (251) is in sliding connection with the smooth segment.

Images