Expansion shaft

Abstract

The utility model discloses an expansion shaft which comprises a shaft barrel, a transmission connecting part, a sliding control part, an axial sliding block and an expansion sliding block, the transmission connecting part and the sliding control part are installed at the two ends of the shaft barrel respectively, the axial sliding block and the expansion sliding block are installed in the shaft barrel in a sliding mode, the shaft barrel is provided with an open hole for the expansion sliding block to be exposed on the outer surface of the shaft barrel in a sliding mode, and the expansion sliding block is axially limited and clamped in the open hole. A plurality of first inclined faces are arranged on the axial sliding block, a plurality of second inclined faces corresponding to the first inclined faces are arranged on the expansion sliding block, the first inclined faces and the second inclined faces are matched with each other, and one end of the axial sliding block is connected with a sliding control part. The inner core is clamped and fixed to the shaft barrel, through precise matching of the multiple first inclined faces and the multiple second inclined faces, the expansion sliding blocks have uniform and stable force exerting strength at any positions, abutting against the inner core, of the expansion sliding blocks, the situations of shaking, deviation and the like caused by uneven force exerting are avoided, and the production efficiency and the product quality are guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of expansion shaft, specifically a kind of expansion shaft. BACKGROUND

[0002] Expansion shaft is the tool used to store flexible band-shaped material in factory, and corresponding specification circular paper tube or rubber tube is also needed as the inner core of material when using, but expansion shaft is separated from circular paper tube or rubber tube before use, so paper or rubber inner core needs to be placed and fixed on expansion shaft in advance when using, and the effort intensity of existing expansion shaft is not uniform when clamping inner core and material, leading to instability in the process of rotating storage, for example, when loading multiple rolls of material, it may shake and deviate due to uneven effort, affecting the neatness and safety of material storage;When loading single roll of material, it may not be able to fix material well due to unstable effort, so that it loosens in the process of rotating, and then affects production efficiency and product quality. SUMMARY

[0003] (1) technical problem to be solved

[0004] In order to solve the above problems, the utility model provides an expansion shaft with uniform effort and good use stability.

[0005] (2) technical scheme

[0006] The utility model discloses a kind of expansion shaft, including shaft cylinder, respectively installed transmission connecting part and sliding control part in the both ends of shaft cylinder and slidingly installed axial slider and expansion slider in shaft cylinder, the opening for expansion slider sliding exposure is opened in the outer surface of shaft cylinder, the expansion slider is limitedly connected in the opening by axial, the axial slider is equipped with several first inclined surfaces, the expansion slider is equipped with several second inclined surfaces corresponding to first inclined surface, the first inclined surface and second inclined surface mutually fit, one end of the axial slider is connected sliding control part.

[0007] Further scheme is, the sliding control part includes adjusting screw being screwed in one end of shaft cylinder and abutting block being movably installed between adjusting screw and one end of axial slider, the other end of axial slider away from abutting block is equipped with compression spring.

[0008] Further scheme is, the inner surface of shaft cylinder is equipped with guiding groove extending along axial direction, and the axial slider is slidingly installed in the guiding groove.

[0009] Further scheme is, several second inclined surfaces on the axial slider are evenly arranged along straight line interval, and several first inclined surfaces on the expansion slider are evenly arranged along relatively parallel straight line interval.

[0010] A further solution is that the transmission connection part includes a first limiting sleeve threadedly connected to the end of the shaft tube away from the sliding control part and a connecting part fixed on the first limiting sleeve for connecting a fixed motor or a reducer, and the end of the shaft tube away from the first sleeve is threadedly connected to a second limiting sleeve, and both ends of the expansion slider are extended to both sides with stop blocks, and the first limiting sleeve and the second limiting sleeve respectively limit the stop blocks at both ends of the expansion slider.

[0011] A further solution is that the connecting member is a shaft rod.

[0012] A further solution is that the connecting piece is a shaft sleeve.

[0013] A further solution is that three groups of axial sliders and expansion sliders are correspondingly provided in the shaft sleeve, three openings are evenly opened on the shaft sleeve, and the angle between adjacent axial sliders is 120 degrees.

[0014] A further solution is that four groups of axial sliders and expansion sliders are correspondingly provided in the shaft sleeve, four openings are evenly opened on the shaft sleeve, and the angle between adjacent axial sliders is 90 degrees.

[0015] (3) Beneficial effects

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] When the sliding control part drives the axial slider to move along the axial direction of the shaft cylinder, since the expansion slider is limited in the axial direction by the opening, the first inclined surface on the axial slider and the second inclined surface on the expansion slider gradually displace and separate from the state of fitting and contacting. At the same time, the expansion slider slides along the opening toward the outer surface of the shaft cylinder and extends from the outer surface of the shaft cylinder until the first inclined surface and the second inclined surface are completely separated and the expansion slider reaches the maximum extension length. Conversely, when the sliding control part drives the axial slider to move in the opposite direction, the expansion slider gradually retracts into the shaft cylinder.

[0018] During use, the operator first puts the inner core for winding materials on the shaft cylinder, and adjusts the expansion slider to extend out of the shaft cylinder through the sliding control part, so that the inner core is clamped and fixed on the shaft cylinder. Since the utility model is achieved through the precise fit of several first inclined surfaces and second inclined surfaces, the expansion slider on the shaft cylinder can have uniform and stable force strength when it abuts against any position of the inner core. Therefore, after the transmission connection part is installed and connected to the output end of the motor, it can remain stable during the process of rotating the material to the inner core, and will not shake or deflect due to uneven force, thereby ensuring production efficiency and product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional structure diagram.

[0020] Figure 2 This is an exploded view of part of the structure.

[0021] Figure 3 A schematic diagram of part of the structure.

[0022] Figure 4 A perspective view in the main view state.

[0023] Figure 5 A structural diagram showing three groups of axial sliders and expansion sliders.

[0024] Figure 6 A structural diagram showing four groups of axial sliders and expansion sliders.

[0025] The components in the accompanying drawings are marked as follows: 1. Shaft cylinder; 11. Opening; 12. Guide groove; 2. Transmission connection part; 21. First limiting sleeve; 211. Connecting piece; 22. Second limiting sleeve; 3. Sliding control part; 31. Adjusting screw; 32. Abutment block; 4. Axial slider; 41. First inclined surface; 42. Compression spring; 5. Expansion slider; 51. Second inclined surface; 52. Stop block. DETAILED DESCRIPTION

[0026] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] like Figures 1-6The utility model discloses an expansion shaft, including shaft cylinder 1, respectively install transmission connecting portion 2 and sliding control portion 3 of shaft cylinder 1 both ends and slide and install axial slider 4 and expansion slider 5 in shaft cylinder 1, the opening 11 that is set up on shaft cylinder 1 is exposed on the outer surface of shaft cylinder 1 for expansion slider 5 sliding, expansion slider 5 is axially limited and is clamped in the opening 11, be equipped with a plurality of first inclined plane 41 on axial slider 4, be equipped with a plurality of second inclined plane 51 of corresponding first inclined plane 41 on expansion slider 5, first inclined plane 41 and second inclined plane 51 mutually fit, one end of axial slider 4 is connected sliding control portion 3, when sliding control portion 3 drive axial slider 4 moves along the axial direction of shaft cylinder 1, because expansion slider 5 is limited and moves in the axial direction by opening 11, therefore the first inclined plane 41 on axial slider 4 and the second inclined plane 51 on expansion slider 5 gradually dislocate and separate from the state of mutual fit, and expansion slider 5 slides along the opening 11 to the outer surface direction of shaft cylinder 1 and extends on the outer surface of shaft cylinder 1, until first inclined plane 41 and second inclined plane 51 completely separate, expansion slider 5 reaches limit extension length, conversely when sliding control portion 3 drive axial slider 4 reversely moves, expansion slider 5 gradually retracts into shaft cylinder 1,

[0028] When using, the operator first puts the inner core for winding material on the shaft cylinder 1, adjusts the expansion slider 5 to extend out of the shaft cylinder 1 through the sliding control portion 3, so that the inner core is clamped and fixed on the shaft cylinder 1, and because the utility model is precisely fitted through the first inclined plane 41 and the second inclined plane 51, the expansion slider 5 on the shaft cylinder 1 has uniform and stable force intensity at any position abutting the inner core, so that the transmission connecting portion 2 can keep stable during the process of rotating and storing the material into the inner core after being connected to the motor output end, and the production efficiency and product quality are ensured.

[0029] The sliding control portion 3 in the utility model embodiment comprises an adjusting screw 31 screw-connected to one end of the shaft cylinder 1 and an abutting block 32 movably installed between the adjusting screw 31 and one end of the axial slider 4, and the other end of the axial slider 4 away from the abutting block 32 is provided with a compression spring 42, when the operator rotates the adjusting screw 31, the adjusting screw 31 is screw-connected to the shaft cylinder 1 and moves along the axial direction and pushes the abutting block 32, the abutting block 32 further applies an axial force to the axial slider 4, so that the axial slider 4 moves along the axial direction of the shaft cylinder 1 to push the expansion slider 5 to slide and extend out of the outer surface of the shaft cylinder 1 along the opening 11, and when the adjusting screw 31 is reversely rotated, the compression spring 42 at the other end of the axial slider 4 away from the abutting block 32 releases the elastic potential energy to reversely move the axial slider 4, so that the first inclined plane 41 and the second inclined plane 51 are fitted again, and the expansion slider 5 retracts into the shaft cylinder 1 under the limitation of the opening 11 of the shaft cylinder 1.

[0030] In order to provide a guiding effect for the sliding of the axial slider 4, the inner surface of the shaft tube 1 is provided with a guide groove 12 extending along the axial direction. The axial slider 4 is slidably installed in the guide groove 12, ensuring the accuracy and stability of the sliding of the axial slider 4. With the guiding effect of the guide groove 12, the axial slider 4 can evenly bear the force from the adjusting screw 31 and the compression spring 42 when it moves under force, reducing local wear and damage caused by uneven force. At the same time, it also reduces the risk of impact and damage to the shaft tube 1 and other components caused by unstable slider movement, thereby extending the service life of the expansion shaft.

[0031] The several second inclined surfaces 51 on the axial slider 4 in the embodiment of the present invention are evenly arranged along a straight line, and the several first inclined surfaces 41 on the expansion slider 5 are evenly arranged along a relatively parallel straight line. When the axial slider 4 is driven to move by the sliding control part 3, the evenly spaced first inclined surfaces 41 and the second inclined surfaces 51 can ensure that when the expansion slider 5 is extended out of the shaft tube 1, the force applied by the axial slider 4 to each expansion slider 5 is uniform. Because the inclined surfaces are evenly spaced, the force transmission is balanced in the circumferential direction, so that when the expansion slider 5 extends out of the outer surface of the shaft tube 1 and abuts against the inner core, the pressure applied to the inner core is evenly distributed in the circumferential direction, ensuring that the inner core is stably and evenly clamped, and avoiding the deformation or loose fixation of the inner core due to excessive or insufficient local pressure.

[0032] The transmission connection part 2 in the embodiment of the present utility model includes a first limiting sleeve 21 threadedly connected to the end of the shaft tube 1 away from the sliding control part 3 and a connecting part 211 fixed on the first limiting sleeve 21 for connecting and fixing the motor or the reducer. The end of the shaft tube 1 away from the first sleeve is threadedly connected to the second limiting sleeve 22, and the two ends of the expansion slider 5 are extended to both sides with a stop block 52. The first limiting sleeve 21 and the second limiting sleeve 22 respectively limit the stop blocks 52 at both ends of the expansion slider 5 to prevent the expansion slider 5 from accidentally extending too long and completely falling out of the shaft tube 1 during operation. At the same time, the limiting structure can also ensure that the expansion slider 5 has moderate force when clamping the inner core, and will not cause excessive squeezing of the inner core to damage the inner core or affect the quality of the material.

[0033] The above-mentioned connecting member 211 can be selected according to the output shaft size of the motor or reducer to select a suitable connecting member 211 so as to be suitable for motors or reducers of different specifications. In some embodiments, the connecting member 211 is a shaft rod. The shaft rod as the connecting member 211 has high strength and stability. Driven by the motor or reducer, the shaft rod can withstand large torque and axial force to ensure the stable operation of the expansion shaft. At the same time, the rigid connection of the shaft rod can reduce energy loss and vibration during the transmission process, and improve transmission efficiency and working accuracy.

[0034] In other embodiments, the connecting member 211 is a bushing (not shown in the figure), which can protect the output shaft of the motor or reducer. During the connection process, the bushing can reduce the direct friction and wear between the output shaft and the expansion shaft, thereby extending the service life of the output shaft. At the same time, the bushing can also prevent the output shaft from being corroded and damaged by the external environment, thereby improving the reliability and durability of the equipment.

[0035] It should be noted that the connection member 211 may be other components that can be adaptively connected to the output end of the motor or reducer in addition to the shaft and sleeve mentioned above, and no further examples will be given here.

[0036] In order to further enhance the stability of the shaft cylinder 1 during use, the combination of the axial slider 4 and the expansion slider 5 can be provided in multiple groups. The key point is that they are evenly distributed in the shaft cylinder 1. When in use, the inner core can be subjected to evenly distributed forces from multiple directions. This multi-directional force method can ensure that the inner core is more evenly stressed in the axial direction, avoiding deformation or loosening of the inner core due to single-point force or uneven force. In the process of storing materials, the inner core can maintain a stable state, thereby improving the quality and accuracy of material winding.

[0037] One of the embodiments is specific that three groups of axial sliders 4 and expansion sliders 5 are correspondingly provided in the sleeve, three openings 11 are evenly opened on the sleeve, and the angle between adjacent axial sliders 4 is 120 degrees. Compared with the design of a single group of sliders, the three groups of sliders can work together to increase the friction and clamping force on the inner core, ensuring that the inner core will not loosen or slip when rotating at high speed and bearing large tension. This is especially important for storing heavier or thicker materials, and can ensure that the equipment can operate safely and reliably under various working conditions.

[0038] Another embodiment is specific in that four groups of axial sliders 4 and expansion sliders 5 are correspondingly provided in the sleeve, and four openings 11 are evenly opened on the sleeve. The angle between adjacent axial sliders 4 is 90 degrees. The design of the four openings 11 enables the sleeve to adapt to more inner cores of different sizes and shapes. By adjusting the position and clamping force of the sliders, the sleeve can be easily adapted to inner cores of various diameters and lengths, thereby improving the versatility and flexibility of the equipment. Whether the inner core is round, square or other special shapes, it can be effectively clamped and fixed to meet the needs of different users.

[0039] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the present invention as claimed.

Claims

1. An expansion shaft, characterized in that: The invention comprises a shaft cylinder (1), a transmission connection part (2) and a sliding control part (3) respectively installed at both ends of the shaft cylinder (1), and an axial slider (4) and an expansion slider (5) slidably installed in the shaft cylinder (1); the shaft cylinder (1) is provided with an opening (11) for the expansion slider (5) to slide and expose on the outer surface of the shaft cylinder (1); the expansion slider (5) is axially limited and clamped in the opening (11); the axial slider (4) is provided with a plurality of first inclined surfaces (41); the expansion slider (5) is provided with a plurality of second inclined surfaces (51) corresponding to the first inclined surfaces (41); the first inclined surfaces (41) and the second inclined surfaces (51) are fitted with each other; one end of the axial slider (4) is connected to the sliding control part (3).

2. The expansion shaft according to claim 1, characterized in that: The sliding control portion (3) comprises an adjusting screw (31) threadedly connected to one end of the shaft cylinder (1) and an abutment block (32) movably mounted between the adjusting screw (31) and one end of the axial slider (4); a compression spring (42) is provided at the other end of the axial slider (4) away from the abutment block (32).

3. The expansion shaft according to claim 2, characterized in that: The inner surface of the shaft cylinder (1) is provided with a guide groove (12) extending in the axial direction, and the axial sliding block (4) is slidably installed in the guide groove (12).

4. The expansion shaft according to claim 1, characterized in that: The plurality of second inclined surfaces (51) on the axial slider (4) are evenly spaced along a straight line, and the plurality of first inclined surfaces (41) on the expansion slider (5) are evenly spaced along relatively parallel straight lines.

5. The expansion shaft according to claim 1, characterized in that: The transmission connection part (2) comprises a first limiting sleeve (21) threadedly connected to the end of the shaft cylinder (1) away from the sliding control part (3) and a connecting piece (211) fixed on the first limiting sleeve (21) for connecting and fixing a motor or a reducer. The end of the shaft cylinder (1) away from the first sleeve is threadedly connected to a second limiting sleeve (22). The two ends of the expansion slider (5) are provided with stop blocks (52) extending to both sides. The first limiting sleeve (21) and the second limiting sleeve (22) respectively limit the stop blocks (52) at both ends of the expansion slider (5).

6. The expansion shaft according to claim 5, characterized in that: The connecting member (211) is a shaft.

7. The expansion shaft according to claim 5, characterized in that: The connecting piece (211) is a shaft sleeve.

8. The expansion shaft according to claim 1, characterized in that: The axial sliders (4) and expansion sliders (5) are correspondingly provided in three groups in the shaft sleeve. Three openings (11) are evenly provided on the shaft sleeve. The angle between adjacent axial sliders (4) is 120 degrees.

9. The expansion shaft according to claim 1, characterized in that: Four groups of axial sliders (4) and expansion sliders (5) are correspondingly provided in the shaft sleeve. Four openings (11) are evenly provided on the shaft sleeve. The angle between adjacent axial sliders (4) is 90 degrees.

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