Winding and unwinding expansion shaft device

Abstract

The utility model provides a winding and unwinding expansion shaft device which comprises a main shaft, a special-shaped shaft, a plurality of expansion blocks and a connecting piece, the special-shaped shaft is arranged on the main shaft in a sleeved mode and connected with the main shaft in a rotation stopping mode, the special-shaped shaft can slide relative to the main shaft in the axial direction of the main shaft, and the special-shaped shaft is provided with a contraction position and an expansion position in the axial direction of the main shaft. The expansion blocks are arranged on the peripheral side of the special-shaped shaft and can move in the radial direction of the main shaft, the expansion blocks are connected with the special-shaped shaft, the multiple expansion blocks are arranged at intervals along the peripheral side of the main shaft, the number of the expansion blocks is at least three, the connecting pieces are used for connecting the expansion blocks and the special-shaped shaft, the expansion blocks are attached to the special-shaped shaft at the contraction position, and the expansion blocks are attached to the special-shaped shaft at the expansion position. The expansion blocks and the special-shaped shafts are arranged at intervals in the radial direction of the main shaft. According to the winding and unwinding expansion shaft device, under the condition that an external air source is not needed, contraction and expansion of the expansion block are controlled by switching the position of the special-shaped shaft on the main shaft, the overall structure of the winding and unwinding expansion shaft device is simplified, and operation efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of winding and unwinding equipment, in particular to a winding and unwinding expansion shaft device. Background Art

[0002] In the sodium and lithium battery industries, pneumatic shafts and pneumatic chucks are commonly used. However, in actual production, these devices have some inherent drawbacks. First, the pneumatic shaft uses an internal airbag structure. After long-term use, the airbag may wear or even rupture, causing gas leakage, which in turn affects the normal operation of the equipment. Second, to ensure the normal operation of the pneumatic shaft, a stable air source system is required, which not only increases the complexity of the equipment but also increases the overall operation and maintenance costs. Utility Model Content

[0003] The utility model provides a winding and unwinding expansion shaft device, which is used to solve the defects of the airbag structure in the prior art and can realize winding and unwinding without the need for the airbag.

[0004] The utility model provides a device for retracting and unretracting a winding shaft, comprising:

[0005] spindle;

[0006] A special-shaped shaft, the special-shaped shaft is sleeved on the main shaft and is connected to the main shaft in a rotationally fixed manner. The special-shaped shaft can slide relative to the main shaft along the axial direction of the main shaft, and the special-shaped shaft has a retracted position and an expanded position in the axial direction of the main shaft;

[0007] A plurality of expansion blocks, each of which is disposed on the outer circumference of the special-shaped shaft and is movable along the radial direction of the main shaft, each of which is connected to the special-shaped shaft, and the plurality of expansion blocks are spaced apart along the outer circumference of the main shaft, and at least three expansion blocks are provided;

[0008] A connecting piece, the connecting piece is used to connect the expansion block and the special-shaped shaft;

[0009] In the contracted position, the expansion block fits the special-shaped shaft, and in the expanded position, the expansion block and the special-shaped shaft are spaced apart in the radial direction of the main shaft.

[0010] The retractable and expanding shaft device implemented by the utility model controls the contraction and expansion of the expansion block by switching the position of the special-shaped shaft on the main shaft without the need for an external air source, which not only simplifies the overall structure of the retractable and expanding shaft device, but also improves operating efficiency.

[0011] In some embodiments, a fitting portion is provided on the special-shaped shaft, and the fitting portion is connected to the expansion block. There are multiple fitting portions, and the multiple fitting portions are arranged at intervals along the circumference of the special-shaped shaft. The multiple fitting portions are arranged in a one-to-one correspondence with the multiple expansion blocks.

[0012] In some embodiments, one end of the connecting member is rotatably connected to the matching portion, and the other end of the connecting member is rotatably connected to the expansion block;

[0013] At least one connecting member is provided between the matching portion and the expansion block.

[0014] In some embodiments, the connecting member rotates around a first axis relative to the special-shaped shaft, and the connecting member rotates around a second axis relative to the expansion block. The axial distance between the first axis and the second axis is L, wherein in the contracted position, L is greater than zero.

[0015] In some embodiments, the retractable and winding shaft device includes a guide member, the guide member is sleeved on the main shaft, the expansion block is provided with a first guide portion, the guide member is provided with a second guide portion, and the first guide portion is movable relative to the second guide portion along the radial direction of the main shaft;

[0016] One of the first guide portion and the second guide portion is a guide rod extending in a radial direction of the main shaft, and the other of the first guide portion and the second guide portion is a through hole.

[0017] In some embodiments, there are multiple second guide portions, and the multiple second guide portions are arranged at intervals along the circumference of the main shaft. The multiple second guide portions are arranged in a one-to-one correspondence with the multiple first guide portions on the expansion blocks.

[0018] In some embodiments, the retractable and expanding shaft device includes a drive assembly configured to switch the profiled shaft between the retracted position and the expanded position;

[0019] The drive assembly includes:

[0020] A rotating shaft, wherein one end of the rotating shaft is provided with a threaded section, and one end of the main shaft is provided with a threaded hole, wherein the threaded section cooperates with the threaded hole;

[0021] A support, the rotating shaft is rotatably arranged on the support, and the support is fixedly connected to the special-shaped shaft.

[0022] In some embodiments, the driving assembly includes a driving member connected to the other end of the rotating shaft, and the driving member is used to drive the rotating shaft to rotate.

[0023] In some embodiments, the retractable and retractable winding shaft device includes a locking assembly, and the locking assembly includes:

[0024] A flange, the flange being sleeved on the rotating shaft and fixedly connected to the support;

[0025] A locking member is provided on a side of the flange member away from the support, the locking member comprises a locking hole matched with the rotating shaft, and the size of the locking hole is adjustable.

[0026] In some embodiments, one of the main shaft and the special-shaped shaft is provided with a strip groove extending along the axial direction of the main shaft, and the other of the main shaft and the special-shaped shaft is provided with a slider, which is slidable along the axial direction of the main shaft to cooperate with the strip groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 It is a structural schematic diagram of a retractable and winding shaft device provided in an embodiment of the utility model.

[0029] Figure 2 It is a schematic diagram of the assembly of the special-shaped shaft, expansion block and connecting piece of the retractable and winding expansion shaft device provided by an embodiment of the present utility model.

[0030] Figure 3 It is a schematic diagram of a special-shaped shaft of the retractable and winding shaft device provided in an embodiment of the present utility model.

[0031] Figure 4 This is a cross-sectional view of the special-shaped shaft of the retractable and expanding shaft device provided by the embodiment of the utility model.

[0032] Figure 5 It is a structural schematic diagram of the expansion block of the retractable and winding expansion shaft device provided by an embodiment of the utility model.

[0033] Figure 6 It is a structural schematic diagram of the guide member of the retractable and winding shaft device provided in an embodiment of the utility model.

[0034] Figure 7 It is a schematic diagram of the assembly of the guide member and the expansion block of the retractable and winding shaft device provided in an embodiment of the utility model.

[0035] Figure 8It is a cross-sectional schematic diagram of a guide member of a retractable and winding shaft device provided in an embodiment of the present utility model.

[0036] Figure 9 It is a structural schematic diagram of the locking assembly of the retractable and winding shaft device provided in an embodiment of the utility model.

[0037] Figure 10 This is a structural schematic diagram from another perspective of the locking assembly of the retractable and winding shaft device provided by an embodiment of the present invention.

[0038] Reference numerals:

[0039] 100. Retracting and unretracting winding shaft device;

[0040] 1. Spindle; 11. Threaded hole; 12. Slider;

[0041] 2. Special-shaped shaft; 20. First axis; 21. Matching portion; 22. Strip groove;

[0042] 3. Expansion block; 30. Second axis; 31. First guide portion; 32. Matching groove;

[0043] 4. Connecting member; 5. Guide member; 51. Second guide portion;

[0044] 6. Driving assembly; 61. Rotating shaft; 62. Threaded segment support; 63. Driving member;

[0045] 7. Locking assembly; 71. Flange; 72. Locking member; 720. Locking hole; 721. First locking portion; 722. Second locking portion; 723. Connecting portion; 724. First spacer; 725. Second spacer. DETAILED DESCRIPTION

[0046] To make the purpose, technical solutions, and advantages of the present invention more clear, the following will be combined with the accompanying drawings to clearly and completely describe the technical solutions of the present invention. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. 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.

[0047] like Figures 1 to 10 As shown, an embodiment of the present invention discloses a device 100 for retracting and expanding a shaft, comprising a main shaft 1, a special-shaped shaft 2, a plurality of expansion blocks 3 and a connecting member 4.

[0048] The special-shaped shaft 2 is sleeved on the main shaft 1 and is non-rotatably connected to the main shaft 1. The special-shaped shaft 2 can slide relative to the main shaft 1 along the axial direction of the main shaft 1. The special-shaped shaft 2 has a contracted position and an expanded position in the axial direction of the main shaft 1.

[0049] Each expansion block 3 is arranged on the outer peripheral side of the special-shaped shaft 2 and can move radially along the main shaft 1. Each expansion block 3 is connected to the special-shaped shaft 2. Multiple expansion blocks 3 are arranged at intervals along the outer peripheral side of the main shaft 1, and at least three expansion blocks 3 are provided.

[0050] The connecting piece 4 is used to connect the expansion block 3 and the special-shaped shaft 2.

[0051] In the contracted position, the expansion block 3 fits against the special-shaped shaft 2 , and in the expanded position, the expansion block 3 and the special-shaped shaft 2 are spaced apart in the radial direction of the main shaft 1 .

[0052] In order to make the technical solution of the present application easier to understand, the following further describes the technical solution of the present application by taking the axial direction of the main shaft 1 and the left and right directions as an example. Figure 1 shown.

[0053] The special-shaped shaft 2 is sleeved on the main shaft 1, and there is no relative rotation between the special-shaped shaft 2 and the main shaft 1. The special-shaped shaft 2 can slide on the main shaft 1 in the left and right directions. When the special-shaped shaft 2 slides to the left side of its travel, the special-shaped shaft 2 is in the retracted position. When the special-shaped shaft 2 slides to the right side of its travel, the special-shaped shaft 2 is in the expanded position.

[0054] There are at least three expansion blocks 3, for example, there are three, four or five expansion blocks 3.

[0055] Each expansion block 3 is movably connected to the special-shaped shaft 2 through a connecting piece 4.

[0056] When the winding and unwinding shaft device 100 is in operation, winding and unwinding can be achieved by switching the position of the special-shaped shaft 2 .

[0057] During the winding process, when greater tension is required to ensure smooth winding, the profiled shaft 2 is moved to the expanded position. At this point, the expansion block 3 moves radially outward from the main shaft 1, increasing the contact area and friction with the material, thereby increasing the tension on the material and helping to ensure winding quality.

[0058] During the unwinding process, to reduce the tension on the material and facilitate unloading, the profiled shaft 2 is moved from the expanded position to the retracted position. At this point, the expansion block 3 fits tightly against the profiled shaft 2, reducing the contact area between the expansion block 3 and the material, thereby reducing the force between them and the tension on the material, facilitating smooth unloading.

[0059] The retractable and expandable shaft device 100 implemented in the present invention controls the contraction and expansion of the expansion block 3 by switching the position of the special-shaped shaft 2 on the main shaft 1 without the need for an external air source, which not only simplifies the overall structure of the retractable and expandable shaft device 100, but also improves operating efficiency and reduces maintenance costs.

[0060] In some embodiments, a fitting portion 21 is provided on the special-shaped shaft 2, and the fitting portion 21 is connected to the expansion block 3. There are multiple fitting portions 21, and the multiple fitting portions 21 are arranged at intervals along the circumference of the special-shaped shaft 2. The multiple fitting portions 21 are arranged in a one-to-one correspondence with the multiple expansion blocks 3.

[0061] For example, the outer circumference of the profiled shaft 2 is designed with multiple mating portions 21. These mating portions 21 can be protrusions, grooves, or other types of structures, and are evenly distributed along the circumference of the profiled shaft 2. Each mating portion 21 is connected to a swelling block 3, and radial movement of the swelling block 3 is achieved through a connector 4. When the profiled shaft 2 slides on the main shaft 1, these mating portions 21 drive the corresponding swelling block 3 to move radially along the main shaft 1, thereby achieving winding and unwinding.

[0062] The number of the matching parts 21 is consistent with the number of the expansion blocks 3 , and there are at least three matching parts 21 , for example, there are three, four or five matching parts 21 .

[0063] The winding and expanding shaft device 100 implemented in the present invention ensures that the material can be evenly stressed when the expansion blocks 3 expand or contract, making the winding and expanding process smoother by providing multiple matching parts 21 and multiple expansion blocks 3.

[0064] In some embodiments, one end of the connector 4 is rotatably connected to the fitting portion 21, and the other end of the connector 4 is rotatably connected to the expansion block 3. At least one connector 4 is provided between the fitting portion 21 and the expansion block 3.

[0065] For example, Figure 1 and Figure 2 As shown, the connecting member 4 is a connecting rod, and a matching groove 32 is provided on the matching portion 21 and the expansion block 3, and a hinge shaft is provided in the matching groove 32. Both ends of the connecting member 4 are provided with a hinge hole, and the two ends of the connecting member 4 extend into the matching groove 32 on the matching portion 21 or the expansion block 3, and then the hinge hole cooperates with the hinge shaft.

[0066] A connector 4 is provided between the fitting portion 21 and the expansion block 3 , or a plurality of connectors 4 are provided. For example, 2-4 connectors 4 are provided between the fitting portion 21 and the expansion block 3 , and the plurality of connectors 4 are sequentially spaced apart along the left-right direction.

[0067] The shaft retracting and unreeling device 100 implemented in the present invention utilizes the connector 4 to achieve relative sliding between the expansion block 3 and the mating portion 21, so that the axial movement of the special-shaped shaft 2 can be converted into the radial movement of the expansion block 3, thereby facilitating reeling and unreeling.

[0068] In some embodiments, the connecting member 4 rotates around the first axis 20 relative to the special-shaped shaft 2, and the connecting member 4 rotates around the second axis 30 relative to the expansion block 3. The axial distance between the first axis 20 and the second axis 30 on the main shaft 1 is L, wherein in the retracted position, L is greater than zero.

[0069] For example, Figure 1 and Figure 2 As shown, the connecting member 4 is hingedly connected to the matching portion 21, and the center line of the hinge axis at the hinge between the connecting member 4 and the matching portion 21 is the first axis 20. The connecting member 4 is hingedly connected to the expansion block 3, and the center line of the hinge axis at the hinge between the connecting member 4 and the expansion block 3 is the second axis 30.

[0070] In the retracted position, the distance L between the first axis 20 and the second axis 30 in the left-right direction is greater than zero. This arrangement ensures that the connecting member 4 can provide the necessary space for the radial movement of the expansion block 3 in different positions.

[0071] If the distance L is zero, it means that in the retracted position, the distance between the connector 4 is exactly equal to the distance between the two hinge points. In this case, the connector 4 has almost no additional room to move, and the expansion block 3 will fit tightly against the profiled shaft 2, which may cause it to get stuck or not be able to deploy smoothly during expansion.

[0072] It is understandable that designers can design the value of L according to actual needs, thereby adjusting the radial movement range of the expansion block 3 in the main shaft 1 to adapt to different inner diameters of the reel.

[0073] In some embodiments, the winding and expansion shaft device 100 includes a guide member 5, which is sleeved on the main shaft 1, a first guide portion 31 is provided on the expansion block 3, and a second guide portion 51 is provided on the guide member 5. The first guide portion 31 can move radially along the main shaft 1 relative to the second guide portion 51.

[0074] One of the first guide portion 31 and the second guide portion 51 is a guide rod extending in the radial direction of the main shaft 1 , and the other of the first guide portion 31 and the second guide portion 51 is a through hole.

[0075] For example, Figure 1 、 Figure 6 and Figure 7 As shown, the guide member 5 is sleeved on the main shaft 1, and its main function is to guide the expansion block 3 to move radially along the main shaft 1. The first guide portion 31 cooperates with the second guide portion 51. When the expansion block 3 moves, the second guide portion 51 can move relative to the first guide portion 31.

[0076] The first guide portion 31 is a guide rod, and the second guide portion 51 is a through hole, or the second guide portion 51 is a guide rod, and the first guide portion 31 is a through hole. The cross-sectional shape of the guide rod is adapted to the shape of the through hole.

[0077] The retractable and winding shaft device 100 implemented by the present invention utilizes the guide member 5 to not only guide the expansion block 3, but also to limit the movement of the expansion block 3, so that the expansion block 3 can only move along the radial direction of the main shaft 1, thereby making the movement of the expansion block 3 smoother, thereby reducing the friction or jamming caused by uneven radial movement, and enhancing the stability and reliability of the retractable and winding shaft device 100.

[0078] In some embodiments, a plurality of second guide portions 51 are provided, and the plurality of second guide portions 51 are arranged at intervals along the circumference of the main shaft 1 , and the plurality of second guide portions 51 are arranged in a one-to-one correspondence with the plurality of first guide portions 31 on the expansion blocks 3 .

[0079] For example, Figures 6 to 8 As shown, the guide member 5 is provided with a plurality of second guide portions 51 spaced apart along the circumference of the main shaft 1 . The number of the second guide portions 51 is the same as the number of the first guide portions 31 , and there are at least three second guide portions 51 .

[0080] The retractable and expandable shaft winding device 100 implemented in the present invention utilizes multiple first guide portions 31 and multiple second guide portions 51 to enable each expansion block 3 to move smoothly in the radial direction of the main shaft 1, thereby improving the stability of the retractable and expandable shaft winding device 100.

[0081] In some embodiments, the expanding shaft device 100 includes a drive assembly 6 configured to switch the profiled shaft 2 between a retracted position and an expanded position.

[0082] The driving assembly 6 includes a rotating shaft 61 and a support 62 . A threaded section is provided at one end of the rotating shaft 61 . A threaded hole 11 is provided at one end of the main shaft 1 . The threaded section cooperates with the threaded hole 11 .

[0083] The rotating shaft 61 is rotatably disposed on the support 62 , and the support 62 is fixedly connected to the special-shaped shaft 2 .

[0084] For example, Figure 1 As shown, the right end of the rotating shaft 61 is provided with a threaded section, and the end surface of the left end of the main shaft 1 is provided with a threaded hole 11. The support 62 is provided with a bearing hole, and the bearing is installed in the bearing hole. The rotating shaft 61 and the bearing are matched, and the support 62 and the special-shaped shaft 2 are connected by bolts.

[0085] The retractable and winding shaft device 100 of the embodiment of the utility model, when the special-shaped shaft 2 needs to be switched to the retracted position, rotates the rotating shaft 61 so that the rotating shaft 61 moves to the left relative to the main shaft 1. At this time, the bearing and the support 62 mounted on the rotating shaft 61 move to the left, thereby driving the special-shaped shaft 2 to slide to the left. As the special-shaped shaft 2 slides to the left, the special-shaped shaft 2 returns to the retracted position. During the movement of the special-shaped shaft 2, the expansion block 3 moves along the radial direction of the main shaft 1 toward the surface of the special-shaped shaft 2 under the joint action of the connecting member 4 and the guide member 5 until the expansion block 3 is completely in contact with the surface of the special-shaped shaft 2.

[0086] To shift the profiled shaft 2 to the expanded position, the rotating shaft 61 is rotated in the opposite direction, causing it to move rightward relative to the main shaft 1. The bearing and support 62 mounted on the rotating shaft 61 then move rightward, driving the profiled shaft 2 to slide rightward. As the profiled shaft 2 slides rightward, it returns to the expanded position. During this movement, the expansion block 3, working in concert with the connector 4 and guide 5, moves radially along the main shaft 1, away from the surface of the profiled shaft 2.

[0087] It should be noted that a bearing seat is also provided at the right end of the main shaft 1 to assist the main shaft 1 in rotating.

[0088] In some embodiments, the drive assembly 6 includes a drive member 63 connected to the other end of the rotating shaft 61 and configured to rotate the rotating shaft 61. For example, the drive member 63 is a motor connected to the rotating shaft 61 via a coupling or a gearbox. Alternatively, the drive member 63 is a handle, and an operator rotates the handle to rotate the rotating shaft 61.

[0089] In some embodiments, the expansion shaft retracting and unretracting device 100 includes a locking assembly 7, which includes a flange 71 and a locking member 72. The flange 71 is sleeved on the rotating shaft 61 and fixedly connected to the support 62. The locking member 72 is located on the side of the flange 71 facing away from the support 62. The locking member 72 includes a locking hole 720 that cooperates with the rotating shaft 61, and the size of the locking hole 720 is adjustable.

[0090] For example, Figure 1 and Figure 9 As shown, the flange 71 is provided on the left side of the support 62 , and the flange 71 is fixedly connected to the support 62 by bolts. The flange 71 can also serve as an end cover to seal the bearing hole on the support 62 .

[0091] The locking member 72 is disposed on the left side of the flange member 71 . The locking member 72 is provided with a locking hole 720 . The diameter of the locking hole 720 is adjustable.

[0092] When the special-shaped shaft 2 needs to be switched to the retracted or expanded position, the drive assembly 6 rotates the rotating shaft 61 to the desired position, and then the diameter of the locking hole 720 is reduced so that the locking hole 720 fits tightly with the rotating shaft 61, thereby locking the rotating shaft 61 in the current position. When the position of the special-shaped shaft 2 needs to be readjusted, the operator increases the diameter of the locking hole 720 to release the locking hole 720 from the rotating shaft 61, and then moves the special-shaped shaft 2 to the new position via the rotating shaft 61.

[0093] The retractable and expandable shaft device 100 implemented in the present invention utilizes a locking assembly, which not only improves the stability and reliability of the retractable and expandable shaft device 100 , but also ensures ease of operation and convenience of maintenance.

[0094] In other embodiments, Figure 10 As shown, the locking member 72 includes a connecting portion 723, a first locking portion 721 and a second locking portion 722. The connecting portion 723 is fixedly connected to the flange member 71. The first locking portion 721 and the second locking portion 722 are both spaced apart from the flange member 71. The first locking portion 721, the second locking portion 722 and the connecting portion 723 are sequentially connected along the circumference of the rotating shaft 61. The inner circumferential wall of the first locking portion 721, the inner circumferential wall of the second locking portion 722 and the inner circumferential wall of the connecting portion 723 define a locking hole 720.

[0095] A first spacer 724 communicating with the locking hole 720 is provided between the first locking portion 721 and the second locking portion 722 , and the spacing of the first spacer 724 is adjustable.

[0096] For example, Figure 10 As shown, the first locking portion 721 and the second locking portion 722 are both connected to the connecting portion 723, and a second spacer 725 is provided between the right end surface of the first locking portion 721 and the left end surface of the flange member 71, and a second spacer 725 is provided between the right end surface of the second locking portion 722 and the left end surface of the flange member 71. Therefore, when the first locking portion 721 and the second locking portion 722 approach or move away from each other to adjust the spacing between the first spacer, the flange member 71 will not affect the movement of the first locking portion 721 and the second locking portion 722.

[0097] The expansion shaft retracting and unretracting device 100 implemented in the present invention can change the size of the locking hole 720 by adjusting the spacing of the first intervals 724, thereby adjusting the tightening degree of the rotating shaft 61.

[0098] In other embodiments, the locking assembly 7 includes a bolt (not shown in the figure), a first threaded hole 11 is provided on the side of the first locking portion 721 forming the first interval 724, and a second threaded hole 11 is provided on the side of the second locking portion 722 forming the first interval 724. The center line of the first threaded hole 11 and the center line of the second threaded hole 11 are collinear, and the bolt cooperates with the first threaded hole 11 and the second threaded hole 11 to adjust the spacing of the first interval 724.

[0099] For example, Figure 10 As shown, the bolt is used to adjust the spacing of the first interval 724 , and the spacing of the first interval 724 is adjusted by cooperating with the first threaded hole 11 and the second threaded hole 11 .

[0100] The center lines of the first threaded hole 11 and the second threaded hole 11 are collinear, ensuring that the bolt can be engaged with both threaded holes 11. The operator adjusts the spacing of the first gap 724 by rotating the bolt, thereby locking or releasing the rotating shaft 61.

[0101] Optionally, a nut is further provided on the first locking portion 721 or the second locking portion 722 , and the bolt is connected to the nut after passing through the first threaded hole 11 and the second threaded hole 11 .

[0102] Optionally, a handle is connected to one side of the bolt, and the size of the first interval 724 can be adjusted by turning the handle.

[0103] In some embodiments, one of the main shaft 1 and the special-shaped shaft 2 is provided with a strip groove 22 extending along the axial direction of the main shaft 1, and the other of the main shaft 1 and the special-shaped shaft 2 is provided with a slider 12, which can be slidably matched with the strip groove 22 along the axial direction of the main shaft 1.

[0104] For example, Figure 1 and Figure 4 As shown, the strip groove 22 extends in the left-right direction, and the slider 12 can move in the left-right direction in the strip groove 22. The main shaft 1 is provided with a strip groove 22, and the slider 12 is fixed on the special-shaped shaft 2, or the special-shaped shaft 2 is provided with a strip groove 22, and the slider 12 is fixed on the main shaft 1.

[0105] The retractable and expanding shaft device 100 implemented in the present invention can ensure the smooth sliding of the special-shaped shaft 2 on the main shaft 1 by using the strip groove 22 and the slider 12, thereby realizing the switching of the special-shaped shaft 2 between the retracted position and the expanded position.

[0106] Optionally, the slider 12 is a key, and the strip groove 22 is a keyway. In the left-right direction, the size of the strip groove 22 is larger than the size of the key. A keyway is provided on the special-shaped shaft 2, and the key is fixed to the main shaft 1 by bolts.

[0107] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A device for retracting and unretracting a winding shaft, characterized in that: include: spindle; A special-shaped shaft, the special-shaped shaft is sleeved on the main shaft and is connected to the main shaft in a rotationally fixed manner. The special-shaped shaft can slide relative to the main shaft along the axial direction of the main shaft, and the special-shaped shaft has a retracted position and an expanded position in the axial direction of the main shaft; A plurality of expansion blocks, each of which is disposed on the outer circumference of the special-shaped shaft and is movable along the radial direction of the main shaft, each of which is connected to the special-shaped shaft, and the plurality of expansion blocks are spaced apart along the outer circumference of the main shaft, and at least three expansion blocks are provided; A connecting piece, the connecting piece is used to connect the expansion block and the special-shaped shaft; In the contracted position, the expansion block fits the special-shaped shaft, and in the expanded position, the expansion block and the special-shaped shaft are spaced apart in the radial direction of the main shaft.

2. The device for retracting and unretracting a winding shaft according to claim 1, characterized in that: The special-shaped shaft is provided with a matching portion, which is connected to the expansion block. There are multiple matching portions, which are arranged at intervals along the circumference of the special-shaped shaft, and the matching portions are arranged in a one-to-one correspondence with the expansion blocks.

3. The device for retracting and unretracting a winding shaft according to claim 2, characterized in that: One end of the connecting member is rotatably connected to the matching portion, and the other end of the connecting member is rotatably connected to the expansion block; At least one connecting member is provided between the matching portion and the expansion block.

4. The device for retracting and unretracting a winding shaft according to claim 1, characterized in that: The connecting member rotates around a first axis relative to the special-shaped shaft, and the connecting member rotates around a second axis relative to the expansion block. The first axis and the second axis are spaced apart by L in the axial direction of the main shaft, wherein L is greater than zero in the contracted position.

5. The device for retracting and unretracting a winding shaft according to claim 1, characterized in that: The retractable and winding shaft device includes a guide member, which is sleeved on the main shaft. The expansion block is provided with a first guide portion, and the guide member is provided with a second guide portion. The first guide portion can move relative to the second guide portion along the radial direction of the main shaft. One of the first guide portion and the second guide portion is a guide rod extending in a radial direction of the main shaft, and the other of the first guide portion and the second guide portion is a through hole.

6. The device for retracting and unretracting a winding shaft according to claim 5, characterized in that: There are multiple second guide parts, and the multiple second guide parts are arranged at intervals along the circumference of the main shaft. The multiple second guide parts are arranged in a one-to-one correspondence with the multiple first guide parts on the expansion blocks.

7. The device for retracting and unretracting a winding shaft according to claim 1, characterized in that: The retractable and expanding shaft device includes a drive assembly configured to switch the profiled shaft between the retracted position and the expanded position; The drive assembly includes: A rotating shaft, wherein one end of the rotating shaft is provided with a threaded section, and one end of the main shaft is provided with a threaded hole, wherein the threaded section cooperates with the threaded hole; A support, the rotating shaft is rotatably arranged on the support, and the support is fixedly connected to the special-shaped shaft.

8. The device for retracting and unretracting a winding shaft according to claim 7, characterized in that: The driving assembly includes a driving member connected to the other end of the rotating shaft, and the driving member is used to drive the rotating shaft to rotate.

9. The device for retracting and unretracting an expansion shaft according to claim 7, characterized in that: The retractable and winding shaft device includes a locking assembly, and the locking assembly includes: A flange, the flange being sleeved on the rotating shaft and fixedly connected to the support; A locking member is provided on a side of the flange member away from the support, the locking member comprises a locking hole matched with the rotating shaft, and the size of the locking hole is adjustable.

10. The device for retracting and unretracting a winding shaft according to claim 1, characterized in that: One of the main shaft and the special-shaped shaft is provided with a strip groove extending along the axial direction of the main shaft, and the other of the main shaft and the special-shaped shaft is provided with a slider, which is slidably matched with the strip groove along the axial direction of the main shaft.

Images