Belt pulley structure with adjustable diameter

Abstract

The invention relates to the technical field of mechanical transmission, and provides a diameter-adjustable belt pulley structure which comprises a fixed wheel disc, an adjusting wheel disc and a belt, and the belt is wound between the fixed wheel disc and the adjusting wheel disc; the adjusting wheel disc comprises a rotating seat and a plurality of adjusting blocks, the adjusting blocks are slidably mounted on the surface of the rotating seat and are arranged around the central axis of the rotating seat, an adjusting area is defined by the adjusting blocks, and an embedding groove allowing a belt to be embedded is formed in the peripheral wall, away from the adjusting area, of each adjusting block; an adjusting seat is rotatably mounted in the center of the adjusting area, a driving assembly is arranged between the adjusting block and the adjusting seat, and when the adjusting seat is driven to rotate, the driving assembly drives the adjusting block to move in the radial direction of the adjusting seat so as to enlarge or reduce the adjusting area. According to the diameter-adjustable belt pulley structure, the transmission ratio of the belt pulley can be conveniently adjusted.

Description

Technical Field

[0001] The present application relates to the technical field of mechanical transmission, and in particular to a pulley structure with adjustable diameter. Background Art

[0002] "Pulley" is a mechanical component that uses friction to transmit power. Pulleys are usually used in various mechanical transmission systems, such as industrial machinery, automobiles, motorcycles, etc., to achieve power transmission between different components. Pulleys have the advantages of simple structure, smooth transmission, and low noise, so they have been widely used in many fields.

[0003] In the prior art, the pulley includes a wheel and a belt. Two wheels are arranged at intervals. The belt is wound around the outer circumference of the two wheels. One of the wheels is driven, and the power can be transmitted to the other wheel through the belt, so that the two wheels rotate synchronously to realize power transmission.

[0004] However, in this type of pulley, the size of the wheel is generally fixed. When the transmission ratio between the two wheels needs to be adjusted, only one of the wheels can be removed and replaced with a wheel of a different diameter, which is time-consuming and labor-intensive. Moreover, when the pulley is located in a small space, it is even more inconvenient to disassemble and assemble the wheel, so further improvement is needed. Summary of the invention

[0005] In order to facilitate the adjustment of the transmission ratio of the pulley, the present application provides a pulley structure with adjustable diameter.

[0006] The present application provides a pulley structure with adjustable diameter, which adopts the following technical solution: A pulley structure with adjustable diameter comprises a fixed wheel disc, an adjusting wheel disc and a belt, wherein the belt is wound between the fixed wheel disc and the adjusting wheel disc; the adjusting wheel disc comprises a rotating seat and an adjusting block, wherein the adjusting block is slidably mounted on the surface of the rotating seat and a plurality of adjusting blocks are arranged around the central axis of the rotating seat, wherein an adjusting area is enclosed by the plurality of adjusting blocks, and a peripheral wall of each adjusting block away from the adjusting area is provided with an embedding groove for embedding the belt; an adjusting seat is rotatably mounted at the center position of the adjusting area, and a driving assembly is arranged between the adjusting block and the adjusting seat, and when the adjusting seat is driven to rotate, the driving assembly drives the adjusting block to move radially along the adjusting seat to expand or reduce the adjusting area.

[0007] By adopting the above technical solution, through the arrangement of the adjustment blocks and the driving assembly, the embedding grooves of the multiple adjustment blocks are used for embedding the belts, so that the fixed wheel disc and the rotating seat are connected in series through the belt. When the external driving source drives the fixed wheel disc or the rotating seat to rotate, the belt can drive the fixed wheel disc and the rotating seat to rotate synchronously to realize power transmission; by driving all the adjustment blocks to move by the driving assembly, the size of the adjustment area can be expanded or reduced, and the transmission ratio of the pulley can be adjusted without disassembling and replacing the wheel disc, thereby improving the working efficiency of the transmission ratio adjustment.

[0008] Optionally, the driving assembly includes a sliding block, an abutment spring, a pushing block and a pushing piece. The sliding block is slidably connected to the rotating seat and can be displaced radially along the adjusting seat. The sliding block is located between the adjusting block and the adjusting seat. The abutment spring is arranged between the sliding block and the rotating seat. The abutment spring normally causes the sliding block to abut against the peripheral wall of the adjusting seat. The pushing block is arranged on the peripheral wall of the adjusting seat. The pushing block has a pushing surface for pushing the sliding block. There are multiple groups of pushing pieces, and each group of pushing pieces is arranged between the sliding block and the adjusting block to drive the sliding block and the adjusting block to displace synchronously.

[0009] By adopting the above-mentioned technical scheme, when the pulley transmission ratio is adjusted through the sliding block, the abutting spring, the pushing block and the pushing piece, the adjusting seat is driven to rotate, and the adjusting seat pushes the sliding block through the pushing surface of the pushing block. The adjusting block moves following the sliding block under the action of the pushing piece, thereby expanding the adjustment area; when the adjustment area is reduced, it is only necessary to drive the adjusting seat to reverse, so that the pushing surface of the pushing block gradually separates from the sliding block, and the sliding block moves in the opposite direction under the action of the abutting spring, thereby reducing the adjustment area and improving the operational convenience of adjusting the pulley transmission ratio.

[0010] Optionally, the pushing member includes a first pushing rod, a second pushing rod and a third pushing rod, wherein one end of the first pushing rod is hinged to the adjusting block, and the other end is hinged to the second pushing rod, and one end of the second pushing rod away from the first pushing rod is hinged to the rotating seat; one end of the third pushing rod is hinged to the sliding block, and the other end is hinged to the end of the first pushing rod away from the adjusting block.

[0011] By adopting the above technical scheme, through the arrangement of the first push rod, the second push rod and the third push rod, the first push rod and the second push rod are hinged to each other. When the adjusting seat rotates to drive the sliding block to move, the third push rod can push or pull the hinge between the first push rod and the second push rod, forcing the first push rod and the second push rod to swing at the same time, changing the distance between the first push rod and the second push rod away from each other at one end, thereby allowing the adjusting block to approach or move away from the adjusting area to change the size of the adjusting area and improve the convenience of adjusting the position of the adjusting block; in addition, the adjusting block is subjected to the reaction force from the belt, and the second push rod and the third push rod can share this reaction force, thereby improving the support effect on the adjusting block and thereby improving the stability of the overall structure.

[0012] Optionally, a plurality of first limit holes are provided on the side wall of the adjustment seat away from the rotating seat, and the plurality of first limit holes are arranged at intervals around the central axis of the adjustment seat, and a second limit hole is provided on the surface of the rotating seat; the adjustment seat is connected with a limit bolt, and the limit bolt is sequentially passed through the first limit hole and the second limit hole and is threadedly connected to the second limit hole.

[0013] By adopting the above-mentioned technical solution and setting the limit bolt, after the pulley transmission ratio is adjusted (that is, after the adjustment of the adjustment area size is completed), the limit bolt is sequentially passed through the first limit hole and the second limit hole, so as to fix the adjustment seat, limit the free rotation of the adjustment seat, and then fix the diameter of the adjustment wheel formed by the combination of multiple adjustment blocks.

[0014] Optionally, an adjustment gap connecting the adjustment areas is formed between two adjacent adjustment blocks, and a support component is provided in the adjustment gap, and the support component is used to support the inner wall of the belt.

[0015] By adopting the above-mentioned technical solution and setting up the support assembly, the support assembly can support the inner wall of the belt to "make up" the gap between two adjacent adjustment blocks, reduce the possibility of the belt having too large a corner at the adjustment gap, and maximize the roundness of the belt at the position of the adjustment wheel.

[0016] Optionally, the support assembly includes a support bar and a driving rod, the support bar is slidably mounted on a rotating seat and is located in an adjustment gap, one end of the driving rod is hinged to the support bar, and the other end is hinged to the adjustment seat; when the adjustment seat drives the adjustment block close to the adjustment area, the driving rod drives the support bar close to the adjustment area, and when the adjustment seat drives the adjustment block away from the adjustment area, the driving rod drives the support bar away from the adjustment area.

[0017] By adopting the above-mentioned technical solution, the adjustment seat is driven to rotate through the setting of the support bar and the driving rod, so that the adjustment block can be displaced to adjust the size of the adjustment area; when the adjustment seat rotates, the adjustment seat can pull or push the support bar through the driving rod, so that the support bar and the adjustment block can be displaced synchronously to support the inner wall of the belt, thereby improving the operational convenience of the overall structure.

[0018] Optionally, the support assembly includes a support bar, a drive ring and a drive rod, the support bar is slidably installed on the rotating seat and displaced within the adjustment gap, the drive ring is rotatably connected to the rotating seat and is coaxially arranged with the adjustment seat, one end of the drive rod is hinged to the support bar, and the other end is hinged to the outer peripheral wall of the drive ring.

[0019] By adopting the above-mentioned technical solution, through the arrangement of the support bar, the drive ring and the drive rod, when the adjustment seat rotates and the adjustment block is displaced (that is, the size of the adjustment area is changed), the drive ring is driven to rotate, and the drive ring can pull or push the support bar through the drive rod. The support bar is adaptively adjusted according to the position change of the adjustment block, so that the support bar can be supported on the inner wall of the belt, thereby reducing the possibility of the belt having too large a corner at the adjustment gap.

[0020] Optionally, when the adjustment block and the support bar are driven away from the adjustment area, the rotation directions of the drive ring and the adjustment seat are opposite; a limiting member is provided between the drive ring and the adjustment seat, and the drive ring and the adjustment seat are limited to each other by the limiting member.

[0021] By adopting the above-mentioned technical scheme and setting the limiting member, when the adjusting block and the support bar are driven away from the adjusting area, the limiting member is used to limit the mutual position of the adjusting block and the support bar, so as to limit the free rotation of the driving ring and the free rotation of the adjusting seat, thereby maintaining the position of the support bar and the adjusting block, and improving the operational convenience of the overall structure; when the adjusting block and the support bar are driven away from the adjusting area, the rotation directions of the driving ring and the adjusting seat are opposite, so that the reaction force from the belt on the driving ring and the reaction force from the belt on the adjusting seat can offset each other, thereby reducing the possibility of the adjusting block or the support bar moving toward the adjusting area under the tightening force of the belt, and improving the stability of the overall structure.

[0022] Optionally, the limiting member includes a limiting ratchet, a limiting pawl and a torsion spring, the limiting ratchet is coaxially arranged on the outer peripheral wall of the adjusting seat, and the outer peripheral wall of the limiting ratchet has a plurality of ratchet positions; one end of the limiting pawl is hinged to the inner peripheral wall of the driving ring, and the torsion spring is arranged between the limiting pawl and the driving ring, and the torsion spring normally causes the free end of the limiting pawl to engage with the ratchet position of the limiting ratchet.

[0023] By adopting the above technical scheme, through the setting of the limiting ratchet, the limiting pawl and the torsion spring, the one-way rotation characteristic of the ratchet and pawl is utilized to limit the rotation direction of the adjustment seat and the driving ring, forcing the adjustment seat to rotate only in one direction so that the adjustment block can only be away from the adjustment area, and forcing the driving ring to rotate only in one direction so that the support bar can only be away from the adjustment area, that is, the effect that can be achieved is: the reverse rotation force formed by the reaction force of the belt on the driving ring and the reverse rotation force formed by the reaction force of the belt on the adjusting seat can be offset by the limiting ratchet and the limiting pawl, thereby limiting the free rotation of the driving ring and the adjusting seat (that is, the support bar and the adjusting block can be fixed after the position adjustment is completed); when it is necessary to reduce the adjustment area, it is only necessary to turn the limiting pawl to force the limiting pawl to disengage from the ratchet position of the limiting ratchet, so that the driving ring and the adjusting seat can be driven to reverse respectively, thereby greatly improving the operational convenience and stability of the overall structure.

[0024] Optionally, a plurality of the limiting pawls are arranged at intervals around the central axis of the driving ring, the number of the torsion springs is arranged corresponding to the number of the limiting pawls, and each of the torsion springs is used to force the free end of the corresponding limiting pawl to engage with the ratchet position of the limiting ratchet wheel.

[0025] By adopting the above technical solution and providing a plurality of limit pawls, the contact point between the drive ring and the adjustment seat is increased, thereby improving the limit effect.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. Through the arrangement of the adjustment block and the driving assembly, the embedding grooves of the multiple adjustment blocks are used for embedding the belt, so that the fixed wheel disc and the rotating seat are connected in series through the belt. When the external driving source drives the fixed wheel disc or the rotating seat to rotate, the belt can drive the fixed wheel disc and the rotating seat to rotate synchronously to realize power transmission; the driving assembly drives all the adjustment blocks to move, which can expand or reduce the size of the adjustment area. The transmission ratio of the pulley can be adjusted without disassembling and replacing the wheel disc, thereby improving the working efficiency of the transmission ratio adjustment; 2. Through the arrangement of the first push rod, the second push rod and the third push rod, the first push rod and the second push rod are hinged to each other. When the adjusting seat rotates to drive the sliding block to move, the third push rod can push or pull the hinge between the first push rod and the second push rod, forcing the first push rod and the second push rod to swing at the same time, changing the distance between the first push rod and the second push rod at one end away from each other, thereby enabling the adjusting block to approach or move away from the adjusting area, so as to change the size of the adjusting area and improve the convenience of adjusting the position of the adjusting block; in addition, the adjusting block is subjected to the reaction force from the belt, and the second push rod and the third push rod can share this reaction force, thereby improving the support effect on the adjusting block and thus improving the stability of the overall structure; 3. By setting the limiting ratchet, limiting pawl and torsion spring, the one-way rotation characteristic of the ratchet and pawl is utilized to limit the rotation direction of the adjustment seat and the driving ring, forcing the adjustment seat to rotate only in one direction so that the adjustment block can only be away from the adjustment area, and forcing the driving ring to rotate only in one direction so that the support bar can only be away from the adjustment area. That is, the effect that can be achieved is: the reverse rotation force formed by the reaction force of the belt on the driving ring and the reverse rotation force formed by the reaction force of the belt on the adjusting seat can be offset by the limiting ratchet and the limiting pawl, thereby limiting the free rotation of the driving ring and the adjusting seat (that is, the support bar and the adjusting block can be fixed after the position adjustment is completed); when it is necessary to reduce the adjustment area, it is only necessary to turn the limiting pawl to force the limiting pawl to disengage from the ratchet position of the limiting ratchet, so as to drive the driving ring and the adjusting seat to reverse respectively, thereby greatly improving the operational convenience and stability of the overall structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic diagram of the overall structure of Example 1; Figure 2 is a schematic diagram of the structure of the adjusting wheel in Embodiment 1; Figure 3 is a schematic diagram of the structure of the drive assembly embodied in Example 1; Figure 4 is a schematic diagram of the structure of the support assembly embodied in Example 2; Figure 5 is a schematic diagram of the structure of the support assembly embodied in Example 3; Figure 6 is a partial cross-sectional view of a rotating block embodied in Embodiment 3; Figure 7 It is a schematic diagram of the structure of the limiter according to the third embodiment.

[0028] Explanation of the accompanying drawings: 1. Fixed wheel disc; 2. Adjusting wheel disc; 21. Rotating seat; 211. First sliding groove; 212. Second sliding groove; 213. Mounting rod; 214. Rotating block; 22. Adjusting block; 221. Embedded groove; 23. Adjusting area; 24. Adjusting seat; 241. First limiting hole; 242. Limiting bolt; 25. Adjusting gap; 3. Belt; 4. Driving assembly; 41. Sliding block; 42. Abutting spring; 43. Pushing block; 431. Pushing surface; 44. First push rod; 45. Second push rod; 46. Third push rod; 5. Support assembly; 51. Support bar; 52. Driving rod; 53. Driving ring; 531. Rotating ring groove; 6. Limiting member; 61. Limiting ratchet; 611. Ratchet position; 62. Limiting pawl; 7. Tensioning wheel disc. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1 -Attached Figure 7 This application is described in further detail.

[0030] Embodiment 1: The embodiment of the present application discloses a pulley structure with adjustable diameter.

[0031] Reference Figure 1 A pulley structure with adjustable diameter includes a fixed wheel disc 1, an adjusting wheel disc 2 and a belt 3, wherein the belt 3 is wound between the fixed wheel disc 1 and the adjusting wheel disc 2, and the fixed wheel disc 1 and the adjusting wheel disc 2 are connected in series through the belt 3; in this embodiment, the fixed wheel disc 1 is used to be connected to an external driving source (such as a motor); a tensioning wheel disc 7 is installed between the fixed wheel disc 1 and the adjusting wheel disc 2, and the peripheral wall of the tensioning wheel disc 7 is pressed against the belt 3 to adjust the tightness of the belt 3.

[0032] Reference Figure 2 , Figure 3 The adjusting wheel 2 includes a rotating seat 21 and an adjusting block 22. In this embodiment, the rotating seat 21 is configured as a circular plate structure, and the adjusting block 22 is installed on the surface of the rotating seat 21. There are multiple adjusting blocks 22, and the multiple adjusting blocks 22 are arranged at intervals around the central axis of the rotating seat 21; the surface of the rotating seat 21 is provided with a plurality of first sliding grooves 211, and the multiple first sliding grooves 211 are correspondingly arranged with the multiple adjusting blocks 22, and both ends of each first sliding groove 211 are extended along the radial direction of the rotating seat 21, and the adjusting block 22 is slidably installed in the corresponding first sliding groove 211, and the adjusting block 22 is slidably installed on the rotating seat 21 through the first sliding groove 211 and can be displaced along the radial direction of the rotating seat 21.

[0033] Reference Figure 2 , Figure 3 For the convenience of description, the area enclosed by multiple adjustment blocks 22 is defined as an adjustment area 23 below. Each adjustment block 22 is provided with an embedding groove 221 for the belt 3 to be embedded in the peripheral wall away from the adjustment area 23; an adjustment seat 24 is rotatably installed on the surface of the mounting seat, and the adjustment seat 24 is located at the center of the adjustment area 23. The adjustment seat 24 is a cylindrical structure, and the adjustment seat 24 is coaxially arranged with the rotating seat 21; a driving component 4 is arranged between each adjustment block 22 and the adjustment seat 24. When the adjustment seat 24 is driven to rotate, the driving component 4 drives the adjustment block 22 to move radially along the adjustment seat 24 to expand or reduce the adjustment area 23.

[0034] Reference Figure 2 , Figure 3The driving assembly 4 includes a sliding block 41, an abutting spring 42, a pushing block 43 and a pushing member. The sliding block 41 is located between the adjusting block 22 and the adjusting seat 24. The sliding block 41 is slidably installed in the first sliding groove 211. The sliding block 41 is slidably installed in the rotating seat 21 through the first sliding groove 211 and can be displaced along the radial direction of the adjusting seat 24; one end of the abutting spring 42 is fixedly connected to the sliding block 41, and the other end is connected to the surface of the rotating seat 21. The abutting spring 42 normally makes the sliding block 41 away from the side wall of the adjusting block 22 and abut against the peripheral wall of the adjusting seat 24; the pushing block 43 is fixedly installed on the peripheral wall of the adjusting seat 24, and the pushing block 43 has a pushing surface 431 for pushing the sliding block 41.

[0035] Reference Figure 2 , Figure 3 The pushing member is arranged between the sliding block 41 and the adjusting block 22 to drive the sliding block 41 and the adjusting block 22 to move synchronously. In this embodiment, there are two groups of pushing members between the sliding block 41 and the adjusting block 22; the pushing member includes a first pushing rod 44, a second pushing rod 45 and a third pushing rod 46, one end of the first pushing rod 44 is hinged to the side wall of the adjusting block 22 close to the sliding block 41, and the other end is hinged to the second pushing rod 45, and the end of the second pushing rod 45 away from the first pushing rod 44 is hinged to the surface of the rotating seat 21, and one end of the third pushing rod 46 is hinged to the sliding block 41, and the other end is hinged to the end of the first pushing rod 44 away from the adjusting block 22.

[0036] Reference Figure 2 A plurality of first limiting holes 241 are provided on the side wall of the adjusting seat 24 away from the rotating seat 21, and the plurality of first limiting holes 241 are arranged at intervals around the central axis of the adjusting seat 24, and a second limiting hole (not shown in the figure) is provided on the surface of the rotating seat 21; a limiting bolt 242 is installed on the adjusting seat 24, and the limiting bolt 242 is sequentially passed through the first limiting hole 241 and the second limiting hole and is threadedly connected with the second limiting hole.

[0037] The implementation principle of the embodiment 1 of the present application is as follows: when adjusting the pulley transmission ratio, the adjustment seat 24 is driven to rotate, and the adjustment seat 24 pushes the sliding block 41 through the pushing surface 431 of the pushing block 43, and the third push rod 46 can push or pull the hinge between the first push rod 44 and the second push rod 45, forcing the first push rod 44 and the second push rod 45 to swing at the same time, changing the distance between the first push rod 44 and the second push rod 45 that are away from each other, so that the adjustment block 22 can be close to or away from the adjustment area 23, so as to change the size of the adjustment area 23, improve the convenience of adjusting the position of the adjustment block 22, and adjust the pulley transmission ratio without disassembling and replacing the wheel disc, thereby improving the working efficiency of the transmission ratio adjustment. In addition, the adjustment block 22 is subjected to the reaction force from the belt 3, and the second push rod 45 and the third push rod 46 can share this reaction force, thereby improving the support effect on the adjustment block 22, and thereby improving the stability of the overall structure.

[0038] Embodiment 2: The embodiment of the present application discloses a pulley structure with adjustable diameter.

[0039] Reference Figure 4 The difference between the diameter-adjustable pulley structure disclosed in the embodiment of the present application and the embodiment 1 is that: In this embodiment, for ease of description, the gap between two adjacent adjustment blocks 22 is defined as an adjustment gap 25, and the adjustment gap 25 is connected to the adjustment area 23; multiple adjustment blocks 22 form multiple adjustment gaps 25, and a support component 5 is provided in each adjustment gap 25, and the support component 5 is used to support the inner wall of the belt 3.

[0040] Reference Figure 4 In this embodiment, the support assembly 5 includes a support bar 51 and a driving rod 52. A second sliding groove 212 located in the adjustment gap 25 is opened on the surface of the rotating seat 21. The two ends of the second sliding groove 212 are extended along the radial direction of the rotating disk. The support bar 51 is slidably installed in the second sliding groove 212 so as to be able to move along the radial direction of the rotating seat 21; the side wall of the support bar 51 away from the adjusting seat 24 is used to support the inner wall of the belt 3, one end of the driving rod 52 is hinged to the side wall of the support bar 51, and the other end is hinged to the peripheral wall of the adjusting seat 24; when the adjusting seat 24 drives the adjusting block 22 to approach the adjusting area 23, the driving rod 52 drives the support bar 51 to approach the adjusting area 23, and when the adjusting seat 24 drives the adjusting block 22 away from the adjusting area 23, the driving rod 52 drives the support bar 51 away from the adjusting area 23.

[0041] It should be noted that the adjustment block 22 and the driving rod 52 are staggered along the axial direction of the adjustment seat 24 so as to avoid collision between the driving rod 52 and the adjustment block 22 when the driving rod 52 swings.

[0042] The implementation principle of Example 2 of the present application is as follows: the support assembly 5 can support the inner wall of the belt 3 to "make up" the gap between two adjacent adjustment blocks 22, reduce the possibility of the belt 3 being located at the adjustment gap 25 with a corner that is too large, and maximize the roundness of the belt 3 at the position of the adjustment wheel 2; drive the adjustment seat 24 to rotate so that the adjustment block 22 can be displaced to adjust the size of the adjustment area 23; when the adjustment seat 24 rotates, the adjustment seat 24 can pull or push the support bar 51 through the driving rod 52, thereby achieving the synchronous displacement of the support bar 51 and the adjustment block 22 to support the inner wall of the belt 3, thereby improving the operational convenience of the overall structure.

[0043] Embodiment 3: The embodiment of the present application discloses a pulley structure with adjustable diameter.

[0044] Reference Figure 5 , Figure 6 The difference between the diameter-adjustable pulley structure disclosed in the embodiment of the present application and the embodiment 2 is that: In this embodiment, the support assembly 5 includes a support bar 51, a drive ring 53 and a drive rod 52. The structure and installation method of the support bar 51 are the same as the support bar 51 of Example 2, and will not be repeated here; the drive ring 53 is rotatably connected to the rotating seat 21, and the drive ring 53 is sleeved on the outer peripheral side of the adjustment seat 24 and is coaxially arranged with the adjustment seat 24; a mounting rod 213 is fixedly installed on the surface of the rotating seat 21, and a rotating block 214 is fixedly installed on the end of the mounting rod 213 away from the rotating seat 21, and a rotating groove 531 is provided on the end surface of the drive ring 53 close to the rotating seat 21, and the rotating groove 531 is arranged in a ring shape around the central axis of the drive ring 53, and the rotating block 214 is slidably installed in the rotating groove 531 of the drive ring 53, and the drive ring 53 is rotatably installed on the rotating seat 21 through the rotating block 214 so that it can rotate around its own central axis.

[0045] Reference Figure 5 One end of the driving rod 52 is hinged to the side wall of the supporting bar 51, and the other end is hinged to the outer peripheral wall of the driving ring 53; for the convenience of description, the following defines the rotation direction in which the adjusting seat 24 drives the adjusting block 22 to move away from the adjusting seat 24 as the positive rotation of the adjusting seat 24 (that is, when the adjusting seat 24 rotates forward, the adjusting block 22 moves outward), and the rotation direction in which the driving ring 53 drives the supporting bar 51 to move away from the adjusting seat 24 is defined as the positive rotation of the driving ring 53 (that is, when the driving ring 53 rotates forward, the supporting bar 51 moves outward); in this embodiment, the positive rotation direction of the driving ring 53 is opposite to the positive rotation direction of the adjusting seat 24, that is, when the adjusting block 22 and the supporting bar 51 are driven away from the adjusting area 23, the rotation directions of the driving ring 53 and the adjusting seat 24 are opposite.

[0046] Reference Figure 6 , Figure 7A limiting member 6 is arranged between the driving ring 53 and the adjusting seat 24, and the driving ring 53 and the adjusting seat 24 are limited to each other by the limiting member 6. The limiting member 6 includes a limiting ratchet 61, a limiting pawl 62 and a torsion spring. The limiting ratchet 61 is coaxially fixed to the outer peripheral wall of the adjusting seat 24, and the outer peripheral wall of the limiting ratchet 61 has a plurality of ratchet positions 611; one end of the limiting pawl 62 is hinged to the inner peripheral wall of the driving ring 53, and for the convenience of description, the other end of the limiting pawl 62 is defined as the free end of the limiting pawl 62 below, and a torsion spring (not shown in the figure) is installed between the limiting pawl 62 and the driving ring 53. The torsion spring normally causes the free end of the limiting pawl 62 to engage with the ratchet position 611 of the limiting ratchet 61.

[0047] In this embodiment, a plurality of limit pawls 62 are arranged at intervals around the central axis of the driving ring 53, and the number of torsion springs is set corresponding to the number of limit pawls 62. Each torsion spring is used to force the free end of the corresponding limit pawl 62 to engage with the ratchet position 611 of the limit ratchet wheel 61.

[0048] The implementation principle of the third embodiment of the present application is: utilizing the one-way rotation characteristic of the ratchet pawl, the reverse rotation of the adjustment seat 24 (i.e., the inward displacement of the adjustment block 22) and the reverse rotation of the drive ring 53 (i.e., the inward displacement of the support strip 51) are limited. When the adjustment block 22 or the support strip 51 is driven to move inward, it is only necessary to open the limit pawl 62. The effect that can be achieved by such a design is that the reverse rotation force formed by the reaction force of the belt 3 on the drive ring 53 and the reverse rotation force formed by the reaction force of the belt 3 on the adjustment seat 24 can be offset by the limit ratchet 61 and the limit pawl 62, thereby limiting the free rotation of the drive ring 53 and the adjustment seat 24 (i.e., the support strip 51 and the adjustment block 22 can be fixed after the position adjustment is completed), reducing the possibility that the adjustment block 22 or the support strip 51 moves toward the adjustment area 23 under the tightening force of the belt 3, and improving the stability of the overall structure.

[0049] The above are preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A pulley structure with adjustable diameter, characterized in that: The invention comprises a fixed wheel disc (1), an adjusting wheel disc (2) and a belt (3), wherein the belt (3) is wound between the fixed wheel disc (1) and the adjusting wheel disc (2); the adjusting wheel disc (2) comprises a rotating seat (21) and an adjusting block (22), wherein the adjusting block (22) is slidably mounted on the surface of the rotating seat (21) and a plurality of adjusting blocks (22) are arranged around the central axis of the rotating seat (21), wherein the plurality of adjusting blocks (22) are arranged to form an adjusting area (23), wherein a peripheral wall of each adjusting block (22) away from the adjusting area (23) is provided with an embedding groove (221) for embedding the belt (3); an adjusting seat (24) is rotatably mounted at the center of the adjusting area (23), wherein a driving assembly (4) is arranged between the adjusting block (22) and the adjusting seat (24), wherein when the adjusting seat (24) is driven to rotate, the driving assembly (4) drives the adjusting block (22) to move radially along the adjusting seat (24) to expand or reduce the adjusting area (23).

2. A pulley structure with adjustable diameter according to claim 1, characterized in that: The driving assembly (4) comprises a sliding block (41), an abutting spring (42), a pushing block (43) and a pushing piece. The sliding block (41) is slidably connected to the rotating seat (21) and can be displaced along the radial direction of the adjusting seat (24). The sliding block (41) is located between the adjusting block (22) and the adjusting seat (24). The abutting spring (42) is arranged between the sliding block (41) and the rotating seat (21). The abutting spring (42) normally makes the sliding block (41) abut against the peripheral wall of the adjusting seat (24); the pushing block (43) is arranged on the peripheral wall of the adjusting seat (24), and the pushing block (43) has a pushing surface (431) for pushing the sliding block (41); and the pushing pieces are provided in a plurality of groups, and each group of the pushing pieces is arranged between the sliding block (41) and the adjusting block (22) so as to drive the sliding block (41) and the adjusting block (22) to displace synchronously.

3. A pulley structure with adjustable diameter according to claim 2, characterized in that: The pushing member comprises a first pushing rod (44), a second pushing rod (45) and a third pushing rod (46); one end of the first pushing rod (44) is hinged to the adjusting block (22), and the other end is hinged to the second pushing rod (45); one end of the second pushing rod (45) away from the first pushing rod (44) is hinged to the rotating seat (21); one end of the third pushing rod (46) is hinged to the sliding block (41), and the other end is hinged to the end of the first pushing rod (44) away from the adjusting block (22).

4. The diameter-adjustable pulley structure according to claim 1, characterized in that: A plurality of first limiting holes (241) are provided on a side wall of the adjustment seat (24) away from the rotating seat (21), and the plurality of first limiting holes (241) are arranged at intervals around the central axis of the adjustment seat (24), and a second limiting hole is provided on the surface of the rotating seat (21); the adjustment seat (24) is connected with a limiting bolt (242), and the limiting bolt (242) is sequentially passed through the first limiting hole (241) and the second limiting hole and is threadedly connected to the second limiting hole.

5. The diameter-adjustable pulley structure according to claim 1, characterized in that: An adjustment gap (25) communicating with the adjustment area (23) is formed between two adjacent adjustment blocks (22), and a support component (5) is provided in the adjustment gap (25), and the support component (5) is used to support the inner wall of the belt (3).

6. A pulley structure with adjustable diameter according to claim 5, characterized in that: The support assembly (5) comprises a support bar (51) and a driving rod (52); the support bar (51) is slidably mounted on the rotating seat (21) and is located in the adjustment gap (25); one end of the driving rod (52) is hinged to the support bar (51), and the other end is hinged to the adjustment seat (24); when the adjustment seat (24) drives the adjustment block (22) to approach the adjustment area (23), the driving rod (52) drives the support bar (51) to approach the adjustment area (23); when the adjustment seat (24) drives the adjustment block (22) to move away from the adjustment area (23), the driving rod (52) drives the support bar (51) to move away from the adjustment area (23).

7. The diameter-adjustable pulley structure according to claim 5, characterized in that: The support assembly (5) comprises a support bar (51), a drive ring (53) and a drive rod (52); the support bar (51) is slidably mounted on the rotating seat (21) and is displaced within the adjustment gap (25); the drive ring (53) is rotatably connected to the rotating seat (21) and is coaxially arranged with the adjustment seat (24); one end of the drive rod (52) is hinged to the support bar (51), and the other end is hinged to the outer peripheral wall of the drive ring (53).

8. The diameter-adjustable pulley structure according to claim 7, characterized in that: When the adjustment block (22) and the support bar (51) are driven away from the adjustment area (23), the rotation directions of the drive ring (53) and the adjustment seat (24) are opposite; a limiting member (6) is provided between the drive ring (53) and the adjustment seat (24), and the drive ring (53) and the adjustment seat (24) are mutually limited by the limiting member (6).

9. The diameter-adjustable pulley structure according to claim 8, characterized in that: The limiting member (6) comprises a limiting ratchet (61), a limiting pawl (62) and a torsion spring. The limiting ratchet (61) is coaxially arranged on the outer peripheral wall of the adjustment seat (24). The outer peripheral wall of the limiting ratchet (61) has a plurality of ratchet tooth positions (611). One end of the limiting pawl (62) is hinged to the inner peripheral wall of the driving ring (53). The torsion spring is arranged between the limiting pawl (62) and the driving ring (53). The torsion spring normally causes the free end of the limiting pawl (62) to engage with the ratchet tooth position (611) of the limiting ratchet (61).

10. The diameter-adjustable pulley structure according to claim 9, characterized in that: A plurality of the limiting pawls (62) are arranged at intervals around the central axis of the driving ring (53), the number of the torsion springs is arranged corresponding to the number of the limiting pawls (62), and each of the torsion springs is used to force the free end of the corresponding limiting pawl (62) to engage with the ratchet position (611) of the limiting ratchet wheel (61).

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