Mechanical expansion shaft

Abstract

The utility model belongs to the technical field of scooters, and particularly relates to a mechanical expansion shaft which comprises a transmission rod, a first sliding block, a second sliding block, a plurality of key bars and an expansion cylinder with an inner space. A plurality of first through holes communicated with the internal space are formed in the outer wall of the expansion cylinder, and the key bars are installed in the first through holes in a one-to-one correspondence mode; the transmission rod is rotationally installed in the inner space, a left-hand thread section and a right-hand thread section which are distributed at intervals are arranged on the transmission rod, a left-hand thread hole in threaded connection with the left-hand thread section is formed in the first sliding block, and a right-hand thread hole in threaded connection with the right-hand thread section is formed in the second sliding block; the key bar is provided with a first inclined face and a second inclined face, the first sliding block is further provided with a third inclined face connected with the first inclined face in an abutting mode, and the second sliding block is further provided with a fourth inclined face connected with the second inclined face in an abutting mode. The mechanical expansion shaft is simple in structure, low in manufacturing cost, easy and convenient to adjust and high in adjusting precision.

Description

Technical Field

[0001] The utility model belongs to the technical field of shafts, and particularly relates to a mechanical expansion shaft. Background Art

[0002] The film is an important component in the battery. During the battery manufacturing process, an expansion shaft is required to install the film roll. The expansion shaft can tighten the film roll from the inside to avoid the accident of the film roll idling. In the prior art, the expansion shaft has problems such as complex structure and low precision. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is: aiming at the technical problems of complex structure and low precision of the expansion shaft in the prior art, a mechanical expansion shaft is provided.

[0004] To solve the above technical problem, an embodiment of the utility model provides a mechanical expansion shaft, which includes a transmission rod, a first slider, a second slider, a plurality of key bars, and a cylinder with an internal space; a plurality of first through holes communicating with the internal space are arranged on the outer wall of the cylinder, and the key bars are correspondingly installed in the first through holes one by one;

[0005] The transmission rod is rotatably installed in the internal space, and a left-handed thread section and a right-handed thread section are arranged on the transmission rod at intervals. A left-handed thread hole threadedly connected with the left-handed thread section is arranged on the first slider, and a right-handed thread hole threadedly connected with the right-handed thread section is arranged on the second slider;

[0006] The key bar is provided with a first inclined surface and a second inclined surface. A third inclined surface abutted against the first inclined surface is further arranged on the first slider, and a fourth inclined surface abutted against the second inclined surface is further arranged on the second slider.

[0007] Optionally, the first slider includes a left-handed nut and a plurality of first inclined blocks. The left-handed nut is provided with the left-handed thread hole and a plurality of first sliding grooves distributed at intervals in a ring shape; the first inclined blocks are correspondingly slidably installed in the first sliding grooves one by one, and each first inclined block is provided with the third inclined surface;

[0008] The mechanical expansion shaft further includes a plurality of adjusting components installed on the left-handed nut; the adjusting components are correspondingly connected with the first inclined blocks and are used for driving the first inclined blocks to move along the first sliding grooves.

[0009] Optionally, the left-handed nut is provided with a set of mounting holes distributed at intervals in a ring shape. The set of mounting holes includes a first threaded hole and a second through hole; a second threaded hole is further arranged on the first inclined block;

[0010] The adjusting assembly includes a first adjusting member provided with a first screw rod and a second adjusting member provided with a second screw rod; the first screw rod passes through the first threaded hole and abuts against the first inclined block, and the first screw rod is threadedly connected to the first threaded hole; the second screw rod passes through the second through hole and is threadedly connected to the second threaded hole.

[0011] Optionally, the mechanical expansion shaft further includes a plurality of third adjusting members and at least two positioning rings detachably sleeved on the expansion cylinder and distributed at intervals; the third adjusting members are installed on the positioning rings and connected to the key strips, and are used for adjusting the flatness of the key strips.

[0012] Optionally, a first notch is provided on the inner wall of the positioning ring, and the key strip is inserted into the first notch.

[0013] Optionally, the mechanical expansion shaft further includes an elastic member sleeved on the transmission rod, and the elastic member abuts against all the key strips.

[0014] Optionally, the mechanical expansion shaft further includes a plurality of positioning members installed on the expansion cylinder; the positioning members abut against the key strips and are used for positioning the key strips.

[0015] Optionally, the mechanical expansion shaft further includes a plurality of pressing blocks all installed on the expansion cylinder, and the positioning members are installed on the pressing blocks one by one;

[0016] A second notch is provided on the key strip, and the positioning member abuts against the bottom wall of the notch.

[0017] Optionally, the mechanical expansion shaft further includes a cylinder cover detachably installed on the expansion cylinder, and the cylinder cover is used for covering the internal space.

[0018] Optionally, the mechanical expansion shaft further includes an expansion seat, and the expansion cylinder is installed on the expansion seat; the cylinder cover and the expansion seat are used for covering the internal space from opposite ends.

[0019] In the present utility model, when the transmission rod is rotated in the first direction, the transmission rod will drive the first slider and the second slider to approach each other. The first slider will drive the key strip to move outwards along the first through hole through the first inclined surface and the third inclined surface that are in mutual contact, and the second slider will drive the key strip to move outwards through the fourth inclined surface and the second inclined surface that are in mutual contact. The first key strip that moves outwards is equivalent to increasing the outer diameter of the mechanical expansion shaft. When the transmission rod is rotated in the second direction opposite to the first direction, the transmission rod will drive the first slider and the second slider to move away from each other. The first inclined block and the second slider will release the restriction on the key strip, and the key strip will move inwards along the first through hole. The first key strip that moves outwards is equivalent to reducing the outer diameter of the mechanical expansion shaft. The mechanical expansion shaft has a simple structure, low manufacturing cost, simple adjustment, and high adjustment accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present utility model will be further described below in conjunction with the drawings and embodiments.

[0021] Figure 1 is a schematic structural diagram of a mechanical expansion shaft provided by an embodiment of the present utility model;

[0022] Figure 2 is an axial sectional view of a mechanical expansion shaft provided by an embodiment of the present utility model;

[0023] Figure 3 is a radial sectional view of a mechanical expansion shaft provided by an embodiment of the present utility model;

[0024] Figure 4 is a side view of a mechanical expansion shaft provided by an embodiment of the present utility model when the cylinder cover is opened;

[0025] Figure 5 is a schematic structural diagram of the first slider of a mechanical expansion shaft provided by an embodiment of the present utility model;

[0026] Figure 6 is a front view of the positioning member and the pressing block installed on the key strip in the present utility model.

[0027] The reference numerals in the specification are as follows:

[0028] 1. Drive rod; 2. First slider; 21. Third inclined surface; 22. Left-handed nut; 23. First inclined block; 24. Left-handed threaded hole; 25. First chute; 3. Second slider; 4. Key strip; 41. First inclined surface; 42. Second inclined surface; 43. Second notch; 5. Expansion cylinder; 51. Internal space; 52. First through hole; 6. Adjustment assembly; 61. First adjustment member; 62. Second adjustment member; 7. Third adjustment member; 8. Positioning ring; 81. First notch; 9. Elastic member; 91. Positioning member; 92. Pressing block; 93. Cylinder cover; 94. Expansion seat. Detailed implementation manners

[0029] In order to make the technical problems, technical solutions and beneficial effects solved by the present 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 the present utility model and are not used to limit the present utility model.

[0030] It should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", "middle", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present utility model.

[0031] As Figure 1 and Figure 2 shown, a mechanical expansion shaft provided by an embodiment of the present utility model includes a drive rod 1, a first slider 2, a second slider 3, a plurality of key strips 4, and an expansion cylinder 5 provided with an internal space 51; a plurality of first through holes 52 communicating with the internal space 51 are provided on the outer wall of the expansion cylinder 5, and the key strips 4 are correspondingly installed in the first through holes 52; it can be understood that the key strips 4 are strip-shaped, correspondingly, the first through holes 52 are strip-shaped through holes, and the key strips 4 are parallel to the axis of the expansion cylinder 5. It should be noted that at least 3 key strips 4 are provided, a part of the key strips 4 is located outside the expansion cylinder 5, and another part of the key strips 4 extends into the internal space 51 through the first through holes 52. The movement of the key strips 4 along the first through holes 52 is equivalent to increasing or decreasing the outer diameter of the expansion cylinder 5.

[0032] The transmission rod 1 is rotatably installed in the internal space 51. The transmission rod 1 is provided with a left-handed thread section and a right-handed thread section that are spaced apart. The first slider 2 is provided with a left-handed thread hole 24 that is threadedly connected to the left-handed thread section. The second slider 3 is provided with a right-handed thread hole (not shown in the figure) that is threadedly connected to the right-handed thread section. It can be understood that both the first slider 2 and the second slider 3 are located in the internal space 51.

[0033] The key strip 4 is provided with a first inclined surface 41 and a second inclined surface 42. The first slider 2 is further provided with a third inclined surface 21 that abuts against the first inclined surface 41. The second slider 3 is further provided with a fourth inclined surface (not shown in the figure) that abuts against the second inclined surface 42.

[0034] Specifically, when the transmission rod 1 is rotated in the first direction, the transmission rod 1 will drive the first slider 2 and the second slider 3 to approach each other. The first slider 2 will drive the key strip 4 to move outward along the first through hole 52 through the mutually abutting first inclined surface 41 and the third inclined surface 21. And the second slider 3 will drive the key strip 4 to move outward through the mutually abutting fourth inclined surface and the second inclined surface 42. The outward-moving first key strip 4 is equivalent to increasing the outer diameter of the mechanical expansion shaft. When the transmission rod 1 is rotated in the second direction opposite to the first direction, the transmission rod 1 will drive the first slider 2 and the second slider 3 to move away from each other. The first inclined block 23 and the second slider 3 will release the restriction on the key strip 4, and the key strip 4 will move inward along the first through hole 52. The outward-moving first key strip 4 is equivalent to reducing the outer diameter of the mechanical expansion shaft. The structure of this mechanical expansion shaft is simple, the manufacturing cost is low, the adjustment is simple, and it has a high adjustment accuracy.

[0035] In one embodiment, as Figure 2 and Figure 5 shown, the first slider 2 includes a left-handed nut 22 and a plurality of first inclined blocks 23. The left-handed nut 22 is provided with the left-handed thread hole 24 and a plurality of first sliding grooves 25 that are annularly spaced apart. The first inclined blocks 23 are slidably installed in the first sliding grooves 25 one by one, and each of the first inclined blocks 23 is provided with the third inclined surface 21. It can be understood that the moving direction of the first inclined block 23 in the first sliding groove 25 is parallel to the axial direction of the left-handed thread hole 24.

[0036] The mechanical expansion shaft further includes a plurality of adjusting components 6 installed on the left-handed nut 22. The adjusting components 6 are connected to the first inclined blocks 23 one by one and are used to drive the first inclined blocks 23 to move along the first sliding grooves 25.

[0037] Specifically, after the transmission rod 1 drives the third inclined surface 21 of the first inclined block 23 to abut against the first inclined surface 41 of the key strip 4 and drives the fourth inclined surface of the second slider 3 to abut against the second inclined surface 42 of the key strip 4, the adjusting assembly 6 drives the first inclined block 23 to move along the first chute 25, so that the third inclined surface 21 of the first inclined block 23 further presses the first inclined surface 41 on the first key strip 4. In this embodiment, the transmission rod 1 can achieve coarse adjustment of the key strip 4, and the adjusting assembly 6 can achieve fine adjustment of the key strip 4, further ensuring the accuracy of installing multiple key strips 4 on the expansion cylinder 5.

[0038] In one embodiment, as Figure 3 and Figure 4 shown, the left-handed nut 22 is provided with an installation hole group (not shown in the figure) distributed at intervals in a ring shape, and the installation hole group includes a first threaded hole and a second through hole; the first inclined block 23 is further provided with a second threaded hole; it can be understood that the number of the installation hole group, the second threaded hole, the adjusting assembly 6 and the key strip 4 is equal.

[0039] The adjusting assembly 6 includes a first adjusting member 61 provided with a first screw rod and a second adjusting member 62 provided with a second screw rod; the first screw rod passes through the first threaded hole and abuts against the first inclined block 23, and the first screw rod is in threaded connection with the first threaded hole; the second screw rod passes through the second through hole and is in threaded connection with the second threaded hole. It can be understood that both the first adjusting member 61 and the second adjusting member 62 include but are not limited to adjusting bolts, etc., and the first end of the first adjusting member 61 and the second end of the second adjusting member 62 both abut against the left-handed nut 22.

[0040] In this embodiment, the first adjusting member 61 is in threaded connection with the first inclined block 23, so that the first adjusting member 61 can push the first inclined block 23 forward; the second slider 3 is in threaded connection with the left-handed nut 22, so that the second adjusting member 62 can pull the first inclined block 23 backward; by rotating the first adjusting member 61 and the second adjusting member 62, the first inclined block 23 can be driven to move back and forth in the first chute 25; in addition, the first adjusting member 61 applies a forward thrust to the first inclined block 23, and the second adjusting member 62 applies a backward pulling force to the first inclined block 23, ensuring the stability of the first inclined block 23 installed in the first chute 25.

[0041] In one embodiment, the second slider 3 includes a right-handed nut and a plurality of second inclined blocks. The right-handed nut is provided with the right-handed threaded hole and a plurality of second chutes that are annularly and spaced apart. Each of the second inclined blocks is slidably mounted in a corresponding one of the second chutes, and each of the second inclined blocks is provided with a fourth inclined surface. Understandably, the moving direction of the second inclined block in the second chute is parallel to the axial direction of the right-handed threaded hole.

[0042] In one embodiment, as Figure 1 and Figure 3 shown, the mechanical expansion shaft further includes a plurality of third adjusting members 7 and at least two positioning rings 8 that are detachably sleeved on the expansion cylinder 5 and are spaced apart. The third adjusting member 7 is mounted on the positioning ring 8 and is connected to the key strip 4, and is used to adjust the flatness of the key strip 4. Understandably, each of the key strips 4 is connected to all the positioning rings 8 through the third adjusting member 7, and each of the positioning rings 8 is connected to the key strip 4 through the third adjusting member 7; and the third adjusting member 7 includes, but is not limited to, bolts and the like.

[0043] Understandably, by applying a pulling force to the key strip 4 through the third adjusting member 7, the third adjusting member 7 flattens the key strip 4, ensuring the circular runout accuracy of the key strip 4 bulged on the expansion cylinder 5.

[0044] In a specific embodiment, the positioning ring 8 is provided with a third through hole, the inclined block is provided with a third threaded hole, and the third screw on the third adjusting member 7 passes through the third through hole and is threadedly connected to the third threaded hole.

[0045] In one embodiment, as Figure 3 and Figure 4 shown, a first notch 81 is provided on the inner wall of the positioning ring 8, and the key strip 4 is inserted into the first notch 81. Understandably, when the third adjusting member 7 drives the key strip 4, after the key strip 4 is flush with the inner wall of the first notch 81, it indicates that the third adjusting member 4 has flattened the key strip 4.

[0046] In one embodiment, as Figure 2 shown, the mechanical expansion shaft further includes an elastic member 9 sleeved on the transmission rod 1, and the elastic member 9 abuts against all the key strips 4. Understandably, the elastic member 9 includes, but is not limited to, springs and the like.

[0047] Specifically, when the transmission rod 1 is rotated in the first direction, the transmission rod 1 will drive the first slider 2 and the second slider 3 to approach each other. The first slider 2 will drive the key strip 4 to move outward along the first through hole 52 through the mutually abutting first inclined surface 41 and the third inclined surface 21, and the key strip 4 will compress the elastic member 9. When the transmission rod 1 is rotated in the second direction opposite to the first direction, the transmission rod 1 will drive the first slider 2 and the second slider 3 to move away from each other. The first inclined block 23 and the second slider 3 will release the restriction on the key strip 4, and the elastic member 9 will drive the key strip 4 to move inward along the first through hole 52 (the key strip 4 is reset). In this embodiment, the design of the elastic member 9 ensures the stability of the movement of the key strip 4 on the expansion cylinder 5.

[0048] In one embodiment, as Figure 1 and Figure 6 shown, the mechanical expansion shaft further includes a plurality of positioning members 91 installed on the expansion cylinder 5; the positioning members 91 are in contact with the key strip 4 and are used to position the key strip 4. It can be understood that the positioning members 91 include but are not limited to positioning ball beads, positioning pins, etc. In this embodiment, the positioning members 91 are in contact with the key strip 4, and the positioning members 91 can effectively prevent the key strip 4 from being misaligned during repeated expansion and reset.

[0049] In one embodiment, as Figure 1 and Figure 6 shown, the mechanical expansion shaft further includes a plurality of pressing blocks 92 all installed on the expansion cylinder 5, and the positioning members 91 are installed on the pressing blocks 92 in a one-to-one correspondence; a second notch 43 is provided on the key strip 4, and the positioning members 91 are in contact with the bottom wall of the second notch 43. It can be understood that the positioning members 91 can slide on the pressing blocks 92, and the positioning members 91 are always in contact with the key strip 4, so that the positioning members 91 can effectively prevent the key strip 4 from being misaligned during repeated expansion and reset.

[0050] In one embodiment, as Figure 1 and Figure 2 shown, the mechanical expansion shaft further includes a cylinder cover 93 detachably installed on the expansion cylinder 5, and the cylinder cover 93 is used to cover the internal space 51. Further, the cylinder cover 93 is also connected to the transmission rod 1, and the transmission rod 1 can be driven to rotate through the cylinder cover 93. After the cylinder cover 93 is removed from the expansion cylinder 5, the first adjusting member 61 and the second adjusting member 62 can be driven.

[0051] In one embodiment, as Figure 1 and Figure 2As shown, the mechanical expansion shaft further includes a swelling seat 94, and the swelling cylinder 5 is installed on the swelling seat 94; the cylinder cover 93 and the swelling seat 94 are used to cover the internal space 51 from opposite ends. It can be understood that the swelling cylinder 5 is also a shaft body, and the swelling seat 94 can play a role in supporting the swelling cylinder 5 and the transmission rod 1; and the cylinder cover 93 can play a role in covering the internal space 51 from the left end, and the swelling seat 94 can play a role in sealing the internal space 51 from the right end.

[0052] In summary, the precision adjustment steps of the mechanical expansion shaft are as follows: First, after sleeving at least two of the positioning rings 8 on the swelling cylinder 5, drive the key strip 4 to move through the third adjusting member 7 until the third adjusting member 7 flattens the key strip 4; then, after removing the positioning ring 8 from the swelling cylinder 5, rotate the transmission rod 1 in the first direction, and the transmission rod 1 will drive the first slider 2 and the second slider 3 to approach each other. The third inclined surface 21 of the first slider 2 abuts against the first inclined surface 41 of the key strip 4, and the fourth inclined surface of the second slider 3 abuts against the second inclined surface 42 of the key strip 4; thereafter, by rotating the first adjusting member 61 and the second adjusting member 62, the first adjusting member 61 and the second adjusting member 62 can drive the first inclined block 23 to move in the first sliding groove 25 until the third inclined surface 21 on the first inclined block 23 presses against the first inclined surface 41 on the key strip 4.

[0053] The above are only the embodiments of the mechanical expansion shaft of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A mechanical expansion shaft, characterized in that, It includes a transmission rod, a first slider, a second slider, a plurality of key bars, and a expansion cylinder provided with an internal space; a plurality of first through holes communicating with the internal space are provided on the outer wall of the expansion cylinder, and the key bars are respectively installed in the first through holes; The transmission rod is rotatably installed in the internal space, and left-handed threaded sections and right-handed threaded sections are provided on the transmission rod at intervals. A left-handed threaded hole threadedly connected to the left-handed threaded section is provided on the first slider, and a right-handed threaded hole threadedly connected to the right-handed threaded section is provided on the second slider; The key bar is provided with a first inclined surface and a second inclined surface. A third inclined surface abutted against the first inclined surface is further provided on the first slider, and a fourth inclined surface abutted against the second inclined surface is further provided on the second slider.

2. The mechanical expansion shaft according to claim 1, wherein The first slider includes a left-handed nut and a plurality of first inclined blocks. The left-handed nut is provided with the left-handed threaded hole and a plurality of first sliding grooves distributed at intervals in a ring shape; the first inclined blocks are respectively slidably installed in the first sliding grooves, and each first inclined block is provided with the third inclined surface; The mechanical expansion shaft further includes a plurality of adjusting components installed on the left-handed nut; the adjusting components are respectively connected to the first inclined blocks and are used to drive the first inclined blocks to move along the first sliding grooves.

3. The mechanical expansion shaft according to claim 2, wherein The left-handed nut is provided with a set of mounting holes distributed at intervals in a ring shape. The set of mounting holes includes a first threaded hole and a second through hole; a second threaded hole is further provided on the first inclined block; The adjusting component includes a first adjusting member provided with a first screw rod and a second adjusting member provided with a second screw rod; the first screw rod passes through the first threaded hole and abuts against the first inclined block, and the first screw rod is threadedly connected to the first threaded hole; the second screw rod passes through the second through hole and is threadedly connected to the second threaded hole.

4. The mechanical expansion shaft according to claim 1, characterized in that, The mechanical expansion shaft further includes a plurality of third adjusting members and at least two positioning rings detachably sleeved on the expansion cylinder and distributed at intervals; the third adjusting members are installed on the positioning rings and are connected to the key bars and are used to adjust the flatness of the key bars.

5. The mechanical expansion shaft according to claim 4, characterized in that, A first notch is provided on the inner wall of the positioning ring, and the key bar is inserted into the first notch.

6. The mechanical expansion shaft according to claim 1, wherein The mechanical expansion shaft further includes an elastic member sleeved on the transmission rod, and the elastic member abuts against all the key bars.

7. The mechanical expansion shaft according to claim 1, characterized in that, The mechanical expansion shaft further includes a plurality of positioning members installed on the expansion cylinder; the positioning members abut against the key bars and are used to position the key bars.

8. The mechanical expansion shaft according to claim 7, characterized in that, The mechanical expansion shaft further includes a plurality of pressing blocks all installed on the expansion cylinder; the positioning members are respectively installed on the pressing blocks; A second notch is provided on the key bar, and the positioning member abuts against the bottom wall of the second notch.

9. The mechanical expansion shaft according to claim 1, characterized in that, The mechanical expansion shaft further includes a cylinder cover detachably installed on the expansion cylinder, and the cylinder cover is used to cover the internal space.

10. The mechanical expansion shaft according to claim 9, characterized in that, The mechanical expansion shaft further includes an expansion seat, and the expansion cylinder is installed on the expansion seat; the cylinder cover and the expansion seat are used to cover the internal space from opposite ends.

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