Expansion shaft

Abstract

The utility model discloses an expansion shaft which comprises a shaft body frame and an expansion assembly which is borne in the shaft body frame. The tensioning assembly comprises a core shaft lead screw located in the shaft body frame, a plurality of wedge-shaped tensioning blocks embedded into the shaft body frame and evenly distributed in the circumferential direction of the axis of the core shaft lead screw, a rotating wheel arranged on the core shaft lead screw in a sleeving mode, and reset pieces restrained on the wedge-shaped tensioning blocks and promoting the wedge-shaped tensioning blocks to automatically reset when the wedge-shaped tensioning blocks fall back. The shaft body frame comprises shaft seat mechanisms arranged at the two ends of the shaft body frame and a plurality of supporting rods connected with the shaft seat mechanisms at the two ends and evenly distributed in the circumferential direction of the axis of the mandrel lead screw, and a plurality of conical blocks matched with the wedge-shaped tensioning blocks are arranged on the mandrel lead screw. By means of the technical scheme, the simple expansion shaft can adjust the shaft diameter in a rotating mode, the shaft diameter adjusting range is large, self-locking can be achieved, and the manufacturing process is simple.

Description

Technical Field

[0001] The utility model relates to a tensioning shaft, belonging to the technical field of winding and unwinding. Background Art

[0002] A tensioning shaft is a mechanical component used to connect and fix objects, which realizes connection through expansion or tensioning; it is usually installed on a certain machine tool, and through the controllable increase and decrease of the shaft diameter, the fixation of the material roll is realized, the fixed state of the material roll is maintained, and the material roll can be easily unloaded when needed, so as to realize the structure of fixing and rotating the material roll on the machine tool. Because it can provide fast and accurate coil control, as well as the characteristics of easy operation and maintenance, it can improve production efficiency and reduce material waste, and has a wide range of applications in industrial production.

[0003] According to different working principles and structures, tensioning shafts can be divided into different types, including mechanical expansion shafts and air expansion shafts; among them, mechanical expansion shafts realize connection through tensioning or expansion, and have the characteristics of simple connection and convenient disassembly and assembly; they have specific structural forms for different application scenarios. An air expansion shaft uses the expansion and contraction of gas to realize power transmission. When the gas expands due to heat, a certain pressure will be generated, and this pressure can be used to drive other mechanical equipment; when the gas cools and contracts, the original pressure will also decrease, so as to realize the control and adjustment of power.

[0004] At present, the traditional air expansion shaft provides a constant tension and cannot adjust the tension according to the actual needs of the coil, which will lead to uneven coiling of the material, uneven end faces, and waste of raw materials; moreover, the manufacturing process is relatively complex. Limited by its structure and principle, problems such as eccentricity, insufficient roundness, airbag damage, and high noise are likely to occur. In addition, the traditional air expansion shaft requires a gas source during use, and if there is any air leakage anywhere, the air expansion shaft cannot work properly.

[0005] At present, when the traditional air expansion shaft is used to wind the strip material during production for rewinding, the inner wall of the material winding core barrel is fixed and clamped by the air expansion shaft to support and squeeze it. Specifically, there is an air chamber inside the air expansion shaft, and compressed air is filled into the air chamber through an external gas source, so that the air pressure in the air chamber increases, resulting in the expansion of the shaft body of the air expansion shaft, contacting the coil and providing sufficient friction to fix the coil; when the coil needs to be released, the air pressure in the air chamber is reduced, and the shaft body contracts, so as to realize the release of the coil. This not only requires an additional gas source and cylinder components, increasing the equipment cost and volume, but also has a relatively complex structure and is not easy to disassemble and repair. Content of the Utility Model

[0006] In order to solve the above problems and deficiencies existing in the prior art, the purpose of the utility model is to provide a simple tensioning shaft that can rotate and adjust the shaft diameter, has a large shaft diameter adjustment range, can realize self-locking, and has a simple manufacturing process.

[0007] To achieve the above object, the present utility model provides the following solution: A tensioning shaft 1, comprising a shaft body frame 2 and a tensioning assembly 3. The tensioning assembly 3 is carried within the shaft body frame 2. The tensioning assembly 3 includes a core shaft screw 31 located inside the shaft body frame 2, a plurality of wedge-shaped tensioning blocks 32 embedded in the shaft body frame 2 and circumferentially distributed along the axis of the core shaft screw 31, a rotating knurled nut 33 sleeved on the core shaft screw 31, and a reset member 34 that is constrained on the wedge-shaped tensioning blocks 32 and urges them to automatically return to their original positions when the wedge-shaped tensioning blocks 32 fall back. The shaft body frame 2 includes shaft seat mechanisms arranged at both ends of the shaft body frame 2 and a plurality of support rods 21 that connect the shaft seat mechanisms at both ends and are circumferentially distributed along the axis of the core shaft screw 31. A plurality of conical blocks 35 that cooperate with the wedge-shaped tensioning blocks 32 are provided on the core shaft screw 31.

[0008] With the above technical solution, when the rotating knurled nut 33 rotates clockwise, the movement of the axis of the core shaft screw 31 drives the conical surface 351 of the conical block 35 to cooperate with the wedge-shaped tensioning block 32 to push the wedge-shaped tensioning block 32 outwards, thereby realizing an increase in the shaft diameter. At this time, the reset member 34 that is constrained on the wedge-shaped tensioning block 32 will exert a reverse force on the wedge-shaped tensioning block 32; when the rotating knurled nut 33 rotates counterclockwise, the core shaft screw 31 drives the conical block 35 to move back, and the wedge-shaped tensioning block 32 begins to fall back and will automatically contract and return to its original position under the reverse force of the reset member 34. In this solution, the reset member 34 is constrained around the wedge-shaped tensioning block 32, so the wedge-shaped tensioning block 32 can obtain a larger reset space and achieve a larger shaft diameter adjustment range.

[0009] The further setting of the above technical solution is: The reset member 34 is an elastic annular belt.

[0010] With the above technical solution, when the wedge-shaped tensioning block 32 is pushed up by the conical block 35, the reset member 34 is in a stretched state. When the core shaft screw 31 drives the conical block 35 to move back, the wedge-shaped tensioning block 32 will automatically fall back and contract under the pulling force of the reset member 34 that is constrained on its surface.

[0011] The further setting of the above solution is: The wedge-shaped tensioning block 32 is an integral body and the conical block 35 cooperates with it.

[0012] With the above technical solution, when the wedge-shaped tensioning block 32 is pushed up by the conical block 35, the force acting on the wedge-shaped tensioning block 32 will be relatively balanced, making the process of the wedge-shaped tensioning block 32 expanding more stable.

[0013] The further setting of the above solution is: The reset members 34 are evenly distributed on the axis of the core shaft screw 31.

[0014] By adopting the above technical solution, after a plurality of reset members 34 are evenly arranged in the axial direction of the mandrel screw rod 31, the tension acting on the wedge-shaped tightening block 32 will be more balanced, so the contraction process of the wedge-shaped tightening block 32 will be more stable. The above solution is further configured as follows: the wedge-shaped tightening block 32 is provided with a side wall slot 321 matching the reset member 34.

[0015] By adopting the above technical solution, the reset member 34 generates reduced tension due to deformation so that it can tightly clamp the wedge-shaped tightening block 32. This method has good stability and is convenient for installation and disassembly.

[0016] The above scheme is further configured as follows: the shaft seat mechanism includes an adjusting shaft seat 22 and a fixed shaft seat 23 fixedly connected to both ends of the support rod, the adjusting shaft seat 22 cooperates with the rotating knurled nut 33, and the fixed shaft seat 23 is provided with a coupling mechanism.

[0017] By adopting the above technical solution, when the knurled nut is rotated, the core shaft screw rod can be driven to move back and forth along its axial direction.

[0018] Advantages of the utility model:

[0019] The expansion shaft 1 provided by the utility model includes an axis frame 2 and a tensioning assembly 3. By constraining the reset member 34 on the periphery of the wedge-shaped tensioning block 32, the wedge-shaped tensioning block 32 obtains a larger reset space and realizes a larger adjustment range of the shaft diameter; further, when the wedge-shaped tensioning block 32 is lifted up by the conical block 35, the reset member 34 is in a stretched state. When the core shaft screw 31 drives the conical block 35 to move back, the wedge-shaped tensioning block 32 automatically falls back and contracts under the tension of the reset member 34 constrained on its surface; further, by arranging multiple reset members 34 in the axial direction of the core shaft screw 31, the tension acting on the wedge-shaped tensioning block 32 is more balanced, thereby ensuring the stability of the expansion and contraction process of the wedge-shaped tensioning block 32. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the utility model;

[0021] Figure 2 It is a structural schematic diagram of the shaft frame of the utility model;

[0022] Figure 3 It is a structural schematic diagram of the tensioning assembly of the utility model;

[0023] Figure 4 It is a schematic diagram of the cross-sectional structure of the utility model;

[0024] Figure 5 It is a schematic diagram of the structure explosion of the utility model;

[0025] Among them, 1- expansion shaft, 2- shaft frame, 3- tensioning assembly, 21- support rod, 22- adjusting shaft seat, 23- fixed shaft seat, 31- spindle screw, 32- wedge-shaped tensioning block, 33- rotating knurled nut, 34- reset piece, 35- cone block, 211- expansion gap, 221- friction surface, 321- side wall slot, 351- cone surface. DETAILED DESCRIPTION

[0026] The utility model is further described below in conjunction with embodiments:

[0027] Embodiment 1:

[0028] like Figure 1 As shown, the expansion shaft 1 of the utility model includes an axis frame 2 and a tensioning assembly 3.

[0029] like Figure 2 As shown, the shaft frame 2 includes a shaft seat mechanism and a plurality of support rods 21 which are arranged circumferentially along the axis of the expansion shaft 1 and connected to the shaft seat mechanisms at both ends. The shaft seat mechanism includes an adjustable shaft seat 22 and a fixed shaft seat 23 which are fixedly connected to the two ends of the plurality of support rods 21 by bolts. The shaft frame 2 also includes an expansion gap 211 which is formed by the cooperation between the shaft seat mechanism and the support rods 21 and cooperates with the wedge-shaped tensioning block 32.

[0030] It should be noted that the specific position referred to by the expansion gap 211 is the gap formed between the plurality of support rods 21, and the wedge-shaped tensioning block 32 is placed in the gap to complete the expansion and contraction process by cooperating with the clamped object, the reset member 34 and the conical block 35.

[0031] like Figure 3 As shown, the tensioning assembly 3 includes a core shaft screw 31 arranged on the internal axis of the shaft frame 2, a plurality of wedge-shaped tensioning blocks 32 embedded in the shaft frame and arranged circumferentially along the axis of the core shaft screw, a rotating knurled nut 33 sleeved on the core shaft screw, a reset member 34 constrained on the wedge-shaped tensioning block, a plurality of conical blocks 35 arranged on the core shaft screw 31 and cooperating with the wedge-shaped tensioning block 32, a side wall groove 321 arranged on the wedge-shaped tensioning block 32, and a conical surface 351 arranged on the conical block and cooperating with the wedge-shaped tensioning block 32.

[0032] It should be noted that a plurality of conical blocks 35 can be provided according to actual needs, and the plurality of conical blocks 35 are evenly distributed on the axis of the core shaft screw 31, so that the force acting on the wedge-shaped tensioning block 32 is relatively balanced, thereby avoiding the overturning moment causing the wedge-shaped tensioning block to become stuck, broken, or unilaterally lifted and out of the expansion gap 211, thereby making the expansion process of the wedge-shaped tensioning block 32 more stable (the situation of providing multiple conical blocks 35 is not shown in the figure).

[0033] like Figure 4As shown, the reset member 34 is two annular belts constrained in the side wall slot 321 of the wedge-shaped tensioning block 32, and the conical block 35 is fixedly connected to the mandrel screw 31 through a nut. The annular belt can be made of elastic materials, such as polyurethane rubber (TPU), synthetic rubber (TPE), thermoplastic vulcanized rubber (TPV), styrene-butadiene rubber (SBR) and other elastic materials can be used as the annular belt.

[0034] It should be noted that a plurality of reset members 34 can be provided according to actual needs, and the plurality of reset members 34 are evenly distributed on the axis of the core shaft screw 31, so that the tension acting on the wedge-shaped tensioning block 32 is more balanced, thereby avoiding the overturning moment causing the wedge-shaped tensioning block to get stuck, break, or unilaterally tilted out of the expansion gap 211, thereby making the expansion and contraction process of the wedge-shaped tensioning block 32 more stable (the situation of providing multiple reset members 34 is not shown in the figure).

[0035] like Figure 5 As shown, the rotating knurled nut 33 is always subjected to the axial force from the deformation of the annular belt transmitted by the core shaft screw 31 and is in contact with the friction surface 221 of the adjustment shaft seat 22.

[0036] When the utility model is implemented, more support rods and wedge-shaped tightening blocks can be added as needed, so that they are evenly distributed on the shaft frame in the circumferential direction, thereby increasing the contact area between the tightening shaft and the material roll.

[0037] The working principle of this utility model:

[0038] When the knurled nut 33 rotates clockwise, the axial movement of the core shaft screw 31 drives the conical surface 351 of the conical block 35 to cooperate with the wedge-shaped tensioning block 32 to push the wedge-shaped tensioning block 32 outward, and the reset member 34 is in a stretched state, thereby increasing the shaft diameter. At this time, the reset member 34 constrained by the wedge-shaped tensioning block 32 will generate a reverse force on the wedge-shaped tensioning block 32; when the knurled nut 33 rotates counterclockwise, the core shaft screw 31 drives the conical block 35 to move back, rotates counterclockwise and starts to fall back, and will automatically shrink and reset under the reverse force of the reset member 34.

[0039] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention falls within the protection scope of the present invention.

[0040] Although the present invention has been disclosed as above in terms of preferred embodiments, it is not intended to limit the present invention. Anyone familiar with the technology may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the definition of the claims.

Claims

1. A clamping shaft, characterized in that, The expansion shaft (1) includes a shaft body frame (2) and an expansion assembly (3); The shaft body frame (2) includes a shaft seat mechanism and a number of support rods (21), and the shaft seat mechanism includes an adjusting shaft seat (22) and a fixed shaft seat (23); The expansion assembly (3) includes a mandrel screw rod (31), a number of wedge-shaped expansion blocks (32), a rotating knurled nut (33), a reset member (34), and two conical blocks (35); The support rod (21) is provided with an expansion gap (211), the adjusting shaft seat (22) is provided with a friction surface (221), the wedge-shaped expansion block (32) is provided with a side wall slot (321), and the conical block is provided with a conical surface (351).

2. The expansion shaft according to claim 1, wherein, The number of support rods (21) is circumferentially arranged along the axis of the expansion shaft 1 and connects the adjusting shaft seat (22) and the fixed shaft seat (23) at both ends. The adjusting shaft seat (22) and the fixed shaft seat (23) are fixedly connected to both ends of the number of support rods (21) by bolts; the wedge-shaped expansion blocks (32) are embedded in the shaft body frame and are evenly distributed circumferentially along the axis of the mandrel screw rod (31). The reset member (34) is constrained in the side wall slot (321) of the wedge-shaped expansion block (32). The conical blocks (35) are arranged on the axis of the mandrel screw rod (31) and are fixedly connected to the mandrel screw rod (31) by nuts.

3. The expansion shaft according to claim 2, characterized in that, The reset member (34) is two annular bands constrained in the side wall slot (321) of the wedge-shaped expansion block (32).

4. The expansion shaft according to claim 3, characterized in that, The number of wedge-shaped expansion blocks (32) is six.

5. The expansion shaft according to claim 4, wherein The number of support rods (21) is six.

6. The expansion shaft according to claim 5, wherein, The expansion gap (211) is a structure formed by the cooperation of the shaft body frame (2) with the shaft seat mechanism and the six support rods (21) that matches the wedge-shaped expansion blocks (32).

7. The expansion shaft according to claim 6, characterized in that, The friction surface (221) is the contact surface between the adjusting shaft seat (22) and the rotating knurled nut (33) that receives the axial force from the deformation of the annular band transmitted by the mandrel screw rod (31).

8. The expansion shaft according to claim 7, characterized in that, The shaft seat mechanism includes an adjusting shaft seat (22) and a fixed shaft seat (23) fixedly connected to both ends of the support rod (21). The adjusting shaft seat (22) cooperates with the rotating knurled nut (33), and the fixed shaft seat (23) is provided with a coupling mechanism.

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