Adjustable pulley module

Abstract

The utility model relates to sliding door and window accessory technology field, concretely is a kind of adjustable pulley module, including bearing seat, bearing wheel subassembly, adjusting drive component, first limiting component, second limiting component and adjusting component, non-connecting drive mode is used between adjusting component and first limiting component, compared with the drive mode of connection of prior art, the structure between component can be simplified, the assembly of component is facilitated, and when adjusting component moves away from first limiting component direction, directly drive first limiting component to move, avoid each bearing wheel subassembly to adjust immediately and make the height of pulley module jump change, therefore, the above-mentioned non-connecting drive mode can let bearing wheel subassembly be adjusted to suitable height adaptively after separating adjusting component and first limiting component or second limiting component.

Description

Technical Field

[0001] This utility model relates to the technical field of sliding door and window accessories, specifically an adjustable pulley module. Background Technology

[0002] A pulley module is a sliding device that allows doors and windows to slide on a load-bearing structure. These pulley modules typically include a load-bearing base and multiple pulleys mounted on the load-bearing base. To enable the pulleys to adapt to the undulations of the load-bearing structure and ensure that each pulley can contact the load-bearing structure, some pulley modules make the pulleys movable, set an adjusting drive component coupled to the load-bearing guide between each pulley, and configure a limiting structure to limit the pulleys at both ends. This allows the pulleys to adaptively adjust up and down according to the undulations of the load-bearing structure through the mutual pushing action between the load-bearing guide and the adjusting drive component. For example, when a pulley is pushed upward, the load-bearing guide of that pulley pushes the adjusting drive component to move laterally, while the corresponding adjusting drive component pushes the load-bearing guide of the adjacent pulley, and so on, so that each pulley reaches a state of force balance and abuts against the load-bearing structure.

[0003] However, since the existing limiting structure is fixedly installed on the support, it limits the lateral distance that the pulley can move, which in turn limits the adjustable height of the pulley module. In order to control the installation height of doors and windows, the existing pulley module is also equipped with an adjustment component that drives the limiting structure to move laterally. The adjustment component is usually a screw that is threadedly connected to the limiting structure. By rotating the screw, the limiting structure can be moved laterally in sync, thereby adjusting the lateral distance between the two limiting structures, which is to adjust the range of vertical adjustment of the pulley, thereby realizing the adjustment of the installation height of doors and windows. However, since the above-mentioned adjustment component is connected to the limiting structure, when the adjustment component rotates, it will drive the limiting structure to move laterally in sync, causing the pulley to respond immediately and its height to change abruptly, which is not conducive to the adjustment of the height of doors and windows. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of existing adjustable pulley modules, where the pulley height changes abruptly due to the rotation of the adjusting component when adjusting the pulley height, which is not conducive to adjusting the height of doors and windows. This invention provides a pulley module that can adaptively adjust the pulley to a suitable height when adjusting the installation height.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] An adjustable pulley module includes a support base, a support wheel assembly, an adjustment drive component, a first limiting component, a second limiting component, and an adjustment component. Multiple support wheel assemblies are movably arranged linearly along the support base. Each support wheel assembly includes a pulley and a support guide portion disposed on the pulley end. An adjustment drive component is provided for every two adjacent support wheel assemblies. The adjustment drive component is configured with an adjustment drive portion at least partially coupled to the corresponding support guide portion and can move relative to the support base in a linear direction in response to the force of the support guide portion. The first limiting component and the second limiting component are disposed spaced apart on the support base to limit the support wheel assemblies on their sides. They are respectively constructed with a first limiting coupling portion and a second limiting coupling portion at least partially coupled to the corresponding support guide portion. The adjustment component is disposed on the side of the first limiting component and can movably push the first limiting component away from the support wheel assembly in a linear direction, causing the first limiting component to move and reduce the distance between two adjacent support wheel assemblies, or move towards the side away from the support wheel assembly and separate from the first limiting component.

[0007] In response to changes in the flatness of the load-bearing part, the load-bearing guide part interacts with the adjustment drive part, the first limit coupling part, and the second limit coupling part to maintain load-bearing contact between the entire pulley and the load-bearing part.

[0008] Furthermore, it also includes a fixing seat disposed on the side of the first limiting member. The fixing seat is constructed with a threaded through hole extending along the linear direction. The adjusting member is configured as a screw that can pass through the threaded through hole and abut against the surface of the first limiting member. The connection method of the screw and the threaded through hole is simple in structure and convenient and quick to operate and adjust.

[0009] Furthermore, the first limiting member has a limiting groove extending along the linear direction on its upper side, and the bearing seat is equipped with a limiting structure extending longitudinally into the limiting groove. The above arrangement can limit the range of movement of the first limiting member.

[0010] Furthermore, the support base includes a top plate and two side plates, which together form an internal space for accommodating the support wheel assembly, the adjustment drive component, the first limiting component, the second limiting component, the adjustment component, and the fixed base. The top plate and the fixed base are fastened together by screws. The connection between the support base and the fixed base is simple in structure and the connection is stable.

[0011] Furthermore, the first limiting member is constructed with a mounting groove extending longitudinally from its bottom to the limiting groove. The limiting structure is configured to be threadedly connected to a limiting screw on the lower side of the top plate through the mounting groove. By providing the mounting groove, it is convenient to assemble the limiting screw with the bearing seat.

[0012] Furthermore, the first limiting member is configured to match the width of the internal space. The first limiting member can move along the two side plates. This arrangement allows the first limiting member to slide more smoothly. The two side plates not only serve as limiting elements but also as guides for the first limiting member. During assembly, the first limiting member can be directly inserted through the openings formed at the ends of the two side plates and slid into place, which is very convenient.

[0013] Furthermore, the pulley is provided with the bearing guide portion on both ends, and the first limiting coupling portion, the adjustment drive portion and the second limiting coupling portion are arranged in two sets at intervals. The above arrangement can improve the bearing capacity of the pulley module, improve the stress on the bearing wheel assembly and improve stability.

[0014] Furthermore, the first limiting component includes two limiting blocks arranged opposite each other, a trigger part connected between the two limiting blocks for abutting against the adjusting component, a pulley part corresponding to the bearing wheel assembly placed between the two limiting blocks, and the first limiting coupling part respectively constructed on one side of the two limiting blocks opposite to the trigger part. A reinforcing rib is connected to the top of the two limiting blocks, and the limiting groove is configured to penetrate the trigger part from the reinforcing rib. The arrangement of the first limiting component and the fit structure between it and the bearing wheel assembly are compact, and it has high strength and effectively plays a limiting role.

[0015] Compared with the prior art, the adjustment component and the first limiting component of this utility model adopt a non-connected driving method. Compared with the existing connected driving method, it can simplify the structure between components, facilitate the assembly of components, and avoid the adjustment component moving away from the first limiting component and directly driving the first limiting component to move. It also avoids the immediate adjustment of each load-bearing wheel assembly and the resulting jump change in the height of the pulley module. Therefore, the above-mentioned non-connected driving method allows the load-bearing wheel assembly to adaptively adjust to a suitable height after the adjustment component is separated from the first or second limiting component. Attached Figure Description

[0016] Figure 1 A 3D view of the pulley module;

[0017] Figure 2 This is an exploded view of the pulley module;

[0018] Figure 3 This is a cross-sectional view of the pulley module;

[0019] Figure 4 A structural diagram showing the support structure for the guide component;

[0020] Figure 5 A schematic diagram of the structure of the adjusting component and the first limiting component;

[0021] Figure 6A schematic diagram of the structure when adjusting the first limiting component;

[0022] Figure 7 This is a structural schematic diagram of the first limiting component;

[0023] Figure 8 This is an exploded view of the load-bearing wheel assembly;

[0024] Figure 9 A schematic diagram of the load-bearing wheel assembly using two pulleys in a pulley module;

[0025] Figure 10 A schematic diagram of the structure of the load-bearing guide and the adjusting drive component when the load-bearing wheel assembly uses two pulleys. Detailed Implementation

[0026] The following describes a preferred embodiment of the present invention in conjunction with the accompanying drawings.

[0027] See Figures 1 to 3 This embodiment provides an adjustable pulley module that can be mounted on the bottom of doors and windows to slide on a support 100 such as a track. The pulley module includes a support base 1, a support wheel assembly 2, an adjustment drive component 5, a first limiting component 3, a second limiting component 4, and an adjustment component 6. Multiple support wheel assemblies 2 are movably arranged linearly along the support base 1. Each support wheel assembly 2 includes a pulley 22 and a support guide 21' disposed on the end side of the pulley 22. Each pair of adjacent support wheel assemblies 2 is provided with an adjustment drive component 5. The adjustment drive component 5 is configured with an adjustment drive 51 that is at least partially coupled to the corresponding support guide 21' and is responsive to the support guide. The first limiting member 3 and the second limiting member 4 are arranged on the bearing seat 1 at intervals to limit the bearing wheel assembly 2 on the side. They are respectively constructed with a first limiting coupling part 31 and a second limiting coupling part 41 that are at least partially coupled to the corresponding bearing guide part 21'. The adjusting member 6 is arranged on the side of the first limiting member 3. It can move along the linear direction to push the first limiting member 3 away from the bearing wheel assembly 2, so that the first limiting member 3 can move to reduce the distance between the two adjacent bearing wheel assemblies 2, or it can move along the linear direction to the side away from the bearing wheel assembly 2 to separate from the first limiting member 3.

[0028] In response to changes in the flatness of the bearing portion 100, the bearing guide portion 21' interacts with the adjustment drive portion 51, the first limiting coupling portion 31, and the second limiting coupling portion 41 respectively, so that each pulley 22 maintains bearing contact with the bearing portion 100. The bearing contact described in this utility model means that the pulley 22, while in contact with the bearing portion 100, also bears the load of the bearing seat 1.

[0029] See Figure 2In one specific embodiment, the bearing guide 21' is configured to be constructed from the outer periphery of the bearing guide 21 provided on the end side of the pulley 22.

[0030] The first limiting component 3, the second limiting component 4, the adjusting drive component 5, and the load-bearing guide component 21 of this utility model can be made of metal or other existing technical materials that meet mechanical requirements. The load-bearing wheel assembly 2 of this application is configured with at least two units. When the load-bearing wheel assembly 2 is configured with two units, the adjusting drive component 5 is configured with one unit. Figure 2 The load-bearing wheel assembly 2 shown has six units, the adjustment drive member 5 has five units, and the first limiting member 3 and the second limiting member 4 are respectively disposed on the side of the load-bearing seat 1 to limit the load-bearing wheel assembly 2 located at the side end.

[0031] The working principle of this application is as follows: When the pulley module moves to an uneven support section 100, such as an inclined track, the undulating part of the support section 100 will push the corresponding pulley 22 upward, thus generating longitudinal and lateral forces. This causes the pulley 22 to drive its corresponding support guide 21 to move obliquely upward. The lateral force acts on the adjacent adjusting drive member 5, causing the adjusting drive member 5 to push its adjacent support guide 21, so that the support guide 21 drives the pulley 22 to move and adjust to press against the corresponding position on the support section 100, and continues to move downward. Each adjusting drive component 5 transmits a lateral force, causing the next load-bearing guide component 21 to move its pulley 22 to adjust and press against the corresponding position on the load-bearing part 100. This process continues until the force is transmitted to the first limiting component 3 and the second limiting component 4. This ensures that each pulley 22 can achieve a state of force balance under the interaction of the load-bearing guide component 21, the adjusting drive component 5, the first limiting component 3, and the second limiting component 4, according to the undulating state of the load-bearing part 100. This ensures that each pulley 22 can press down on the load-bearing part 100, achieving load-bearing contact and uniform force distribution. The load-bearing contact described in this invention means that the pulley 22, while in contact with the load-bearing part 100, also bears the load of the load-bearing seat 1.

[0032] See Figures 2 to 6The support base 1 also has a fixing base 7 located on the side of the first limiting member 3. The fixing base 7 has a threaded through hole 71 extending in a linear direction. The adjusting member 6 is configured as a screw that can pass through the threaded through hole 71 and abut against the first limiting member 3. The reduction in the distance between two adjacent support wheel assemblies 2 is responded to by the screw rotating clockwise in a first direction, pushing the first limiting member 3 towards the support wheel assembly 2. The separation of the screw from the first limiting member 3 is responded to by the screw rotating counterclockwise in a second direction. For example, by rotating the adjusting member 6 clockwise, the adjusting member 6 is driven to move towards the first limiting member 3, thereby pushing the surface of the first limiting member 3 towards the support wheel assembly 2, compressing the distance between the first limiting member 3 and the second limiting member 4, thereby reducing the distance between each pair of support wheel assemblies 2.

[0033] It should be noted that there is no connection between the adjusting member 6 and the first limiting member 3 in this application. The adjusting member 6 only contacts the side surface of the first limiting member 3. When the adjusting member 6 is rotated in the opposite direction, it can be driven to move in a linear direction away from the bearing wheel assembly 2, thereby separating from the first limiting member 3. It will not directly drive the first limiting member 3 to move away from the bearing wheel assembly 2. After the adjusting member 6 is separated from the first limiting member 3, the upward pushing of the pulley 22 can drive the bearing guide 21 to move upward and push the adjacent adjusting drive member 5, the first limiting member 3 and the second limiting member 4 until the first limiting member 3 re-abuts against the adjusting member 6 or the fixed seat 7, thereby increasing the distance between the two adjacent bearing wheel assemblies 2. The balance is achieved through the interaction between the bearing guide 21, the adjusting drive member 5, the first limiting member 3, the second limiting member 4, the adjusting member 6 or the fixed seat 7.

[0034] Compared with the prior art, the above-mentioned adjustment component 6 and the first limiting component 3 adopt a non-connected driving method. Compared with the existing connected driving method, it can simplify the structure between components, facilitate the assembly of components, and avoid the adjustment component 6 moving away from the first limiting component 3 and directly driving the first limiting component 3 to move. It also avoids the immediate adjustment of each load-bearing wheel assembly 2, which would cause a jump change in the height of the pulley module. Therefore, the above-mentioned non-connected driving method allows the load-bearing wheel assembly 2 to adaptively adjust to a suitable height after the adjustment component 6 is separated from the first limiting component 3 or the second limiting component 4.

[0035] See Figure 6 The first limiting member 3 has a limiting groove 32 extending along the linear direction on its upper side, and the bearing seat 1 is equipped with a limiting structure 11 extending longitudinally into the limiting groove 32. By setting the limiting groove 32 and the limiting structure 11, the movement distance of the first limiting member 3 can be limited.

[0036] See Figures 1 to 3 , Figure 5 The bearing seat 1 includes a top plate 12 and two side plates 13. The top plate 12 and the two side plates 13 enclose an internal space 10 for accommodating the bearing wheel assembly 2, the adjusting drive component 5, the first limiting component 3, the second limiting component 4, the adjusting component 6, and the fixed seat 7. The top plate 12 and the fixed seat 7 are fastened together by screws 102. The connection between the bearing seat 1 and the fixed seat 7 is simple in structure and the connection is stable.

[0037] See Figures 5 to 7 The first limiting member 3 is constructed with a mounting groove 33 extending longitudinally from its bottom to the limiting groove 32. The limiting structure 11 is configured to be threadedly connected to the limiting screw on the lower side of the top plate 12 through the mounting groove 33. By providing the mounting groove 33, it is convenient to assemble the limiting screw with the bearing seat 1.

[0038] See Figure 2 The first limiting member 3 is configured to adapt to the width of the internal space 10. The first limiting member 3 can move along the two side plates 13. The adaptation of the width of the first limiting member 3 to the width of the internal space 10 is understood as the first limiting member 3 being able to move linearly relative to the two side walls of the internal space 10. Specifically, the first limiting member 3 can slide in contact with the two side plates 13, or there can be a certain gap between the first limiting member 3 and the two side plates 13. However, this gap needs to ensure that when the first limiting member 3 contacts either side of the two side plates 13, the first limiting coupling part 31 always maintains load-bearing contact with the load-bearing guide part 21'. Of course, the smaller the gap, the better, so as to avoid collision between the first limiting member 3 and the two side plates 13 during actual use or transportation. The width refers to Figure 3 The distance in the vertical direction shown at the angle. This setting allows the first limiting member 3 to slide more smoothly. The two side plates 13 not only serve as limiting elements, but also as guides for the first limiting member 3. The bearing seat 1 has openings 103 at both ends that connect to the internal space 10. During assembly, the first limiting member 3 can be directly inserted through the openings 103 formed at the ends of the two side plates 13 and slid into place, which is very convenient.

[0039] See Figure 2 In one embodiment, each load-bearing wheel assembly 2 is equipped with a pulley 22, and the load-bearing guide part 21' is constructed on both ends of the pulley 22. Two sets of first limiting member 3, adjusting drive member 5 and second limiting member 4 are assembled alternately. By adopting the above scheme, the force on the load-bearing wheel assembly 2 is improved and the stability is enhanced. At the same time, the first limiting member 3, one or more adjusting drive members 5 and the second limiting member 4 are located on both ends of the pulley 22, which reduces the volume in the linear direction and makes the structure more compact.

[0040] See Figure 9 and Figure 10 In another embodiment, each load-bearing wheel assembly 2 is equipped with two pulleys 22, and the load-bearing guide 21' is constructed from the outer periphery of a load-bearing guide 21' disposed between the inner ends of the two pulleys 22. The adjustment drive member 5 is located between the two pulleys 22 and coupled to the load-bearing guide 21' through the adjustment drive 51. Of course, as some extended solutions, more pulleys 22 can be provided on both sides of the load-bearing guide 21 along its width direction.

[0041] See Figure 9 and Figure 10 As an improved solution, in order to reduce weight and optimize the structure of the adjustment drive component 5, hollowed-out grooves 52 extending inward are constructed on both ends of the adjustment drive component 5.

[0042] See Figures 5 to 7 The first limiting member 3 includes limiting blocks 34 arranged opposite to each other and a trigger part 35 connected between the two limiting blocks 34 for abutting against the adjusting member 6. The pulley 22 of the corresponding bearing wheel assembly 2 is placed between the two limiting blocks 34. The first limiting coupling part 31 is respectively constructed on the side of the two limiting blocks 34 opposite to the trigger part 35. The top of the two limiting blocks 34 is connected to a reinforcing rib 36. The limiting groove 32 is configured to pass through the trigger part 35 from the reinforcing rib 36. The arrangement of the first limiting member 3 and the cooperation structure between it and the bearing wheel assembly 2 are compact. It has high strength and effectively plays a limiting role.

[0043] See Figure 2 , Figure 3 , Figure 6The first limiting coupling part 31 is equipped with a vertical limiting part 37 that limits the vertical degree of freedom of the load-bearing guide part 21' coupled thereto. Since the pulley module of this application is provided with pulleys 22 that can be adaptively adjusted according to the load-bearing part 100, in actual use, the load-bearing seat 1 may tilt due to the change in the height of each pulley 22, causing the door leaf to tilt. In order to prevent the door leaf from tilting excessively, a first limiting member 3 is provided at the edge of the load-bearing seat 1. When the load-bearing seat 1 tilts to the point that the load-bearing guide part 21' presses against the vertical limiting part 37, the maximum tilting amount is reached. At this time, the load-bearing wheel assembly 2 and the load-bearing part 100 are in load-bearing contact and bear the load of the load-bearing seat 1. Therefore, even if the load-bearing seat 1 tilts towards the first limiting member 3, it will not tilt excessively, thereby preventing the door leaf from tilting excessively. In addition, the first limiting member 3 also limits the adjustment range of the load-bearing wheel assembly 2 to avoid excessive adjustment of the pulley 22. Specifically, when the door leaf tilts towards the first limiting member 3, the bearing guide part 21' of the adjacent bearing wheel assembly 2 is subjected to force and pushes against the first limiting coupling part 31 and the adjacent adjusting drive member 5. At this time, the pulley 22 will move upward to the side of the adjacent adjusting drive member 5 for adjustment. When the bearing guide part 21' contacts the vertical limiting part 37, it restricts the movement of the adjacent bearing wheel assembly 2, thereby allowing only other bearing wheel assemblies 2 to make adjustments, thus realizing the control of the tilt of the door leaf.

[0044] See Figure 6 The vertical limiting part 37 is configured as a linear structure extending along the linear direction above the bearing guide part 21'.

[0045] See Figure 3 and Figure 4 The bottom of the support base 1 is provided with a support member 14. The support guide 21 is maintained in the internal space 10 of the support base 1 by the support member 14. The adjustment drive member 5 is maintained in the internal space 10 by the interaction between the support guide 21 and the support member 14 in a non-contact manner. Figure 4 As shown, after the pulley module detaches from the support part 100, the support guide 21 and the adjusting drive member 5 will move downward under the action of gravity. The support guide 21 will be supported on the support member 14, and the adjusting drive member 5 will abut against the support guide 21 on both sides, maintaining a non-contact state with the support member 14. Figure 3As shown, when the pulley module comes into contact with the support part 100, the pulley 22 is pushed upward by the support part 100, which will drive the support guide 21 and the adjustment drive component 5 to move upward away from the support component 14. Therefore, the adjustment drive component 5 and the support component 14 remain in a non-contact state whether the pulley module is working or not. This design avoids the jamming problem caused by contact, improves the smoothness of the operation of the pulley module, and avoids the friction caused by contact of the adjustment drive component 5, thus extending its service life.

[0046] As some specific implementations, the bearing guide 21' is configured as an arc surface or an inclined surface; the adjustment drive 51 is configured as an arc surface or an inclined surface coupled to the bearing guide 21'; and / or, the first limiting coupling part 31 is configured as an arc surface or an inclined surface coupled to the bearing guide 21'; the second limiting coupling part 41 is configured as an arc surface or an inclined surface coupled to the bearing guide 21'.

[0047] See Figure 8 The bearing wheel assembly 2 is equipped with a rotating shaft 24, which passes through the pulley 22, and the bearing guides 21 on both sides are connected to the two ends of the rotating shaft 24.

[0048] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to this utility model should also fall within the protection scope of the claims of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.

Claims

1. An adjustable pulley (22) module, characterized in that, include: Support (1); Multiple load-bearing wheel assemblies (2) are movably arranged linearly along the load-bearing seat (1). The load-bearing wheel assembly (2) includes a pulley (22) and a load-bearing guide (21') disposed on the end side of the pulley (22). An adjustment drive member (5) is provided between adjacent bearing wheel assemblies (2), which is configured with an adjustment drive (51) that is at least partially coupled to the corresponding bearing guide (21'), and can move relative to the bearing seat (1) in a linear direction in response to the force of the bearing guide (21'); The first limiting member (3) and the second limiting member (4) are disposed at intervals on the bearing seat (1) for limiting the bearing wheel assembly (2) on the side, and are respectively constructed with a first limiting coupling part (31) and a second limiting coupling part (41) that are at least partially coupled to the corresponding bearing guide part (21'). An adjusting member (6) is provided on the side of the first limiting member (3). The adjusting member (6) can move along the linear direction to push the first limiting member (3) away from the bearing wheel assembly (2), so that the first limiting member (3) moves to reduce the distance between the two adjacent bearing wheel assemblies (2), or moves to the side away from the bearing wheel assembly (2) and separates from the first limiting member (3). In response to the change in the flatness of the bearing part (100), the bearing guide part (21') interacts with the adjustment drive part (51), the first limiting coupling part (31), and the second limiting coupling part (41) respectively to keep each pulley (22) in bearing contact with the bearing part (100).

2. The adjustable pulley (22) module according to claim 1, characterized in that, It also includes a fixing seat (7) disposed on the side of the first limiting member (3), the fixing seat (7) having a threaded through hole (71) extending along the linear direction, and the adjusting member (6) being configured as a screw that can pass through the threaded through hole (71) and abut against the surface of the first limiting member (3).

3. The adjustable pulley (22) module according to claim 2, characterized in that, The first limiting member (3) has a limiting groove (32) extending along the linear direction on its upper side, and the bearing seat (1) is provided with a limiting structure (11) extending longitudinally into the limiting groove (32).

4. The adjustable pulley (22) module according to claim 3, characterized in that, The support base (1) includes a top plate (12) and two side plates (13). The top plate (12) and the two side plates (13) enclose an internal space (10) for accommodating the support wheel assembly (2), the adjustment drive component (5), the first limiting component (3), the second limiting component (4), the adjustment component (6), and the fixed seat (7). The top plate (12) and the fixed seat (7) are fastened together by screws (102).

5. The adjustable pulley (22) module according to claim 4, characterized in that, The first limiting member (3) is constructed with a mounting groove (33) extending longitudinally from its bottom to the limiting groove (32), and the limiting structure (11) is configured to be threaded to a limiting screw on the underside of the top plate (12) through the mounting groove (33).

6. The adjustable pulley (22) module according to claim 4, characterized in that, The first limiting member (3) is configured to fit the width of the internal space (10) and the first limiting member (3) can slide along the two side plates (13).

7. The adjustable pulley (22) module according to claim 3, characterized in that, The pulley (22) has a bearing guide (21') on both ends, and the first limiting coupling part (31), the adjustment drive part (51) and the second limiting coupling part (41) are arranged in two sets at intervals.

8. The adjustable pulley (22) module according to claim 7, characterized in that, The first limiting member (3) includes a limiting block (34) arranged opposite to each other, and a trigger part (35) connected between the two limiting blocks (34) for abutting against the adjusting member (6). The pulley (22) of the corresponding bearing wheel assembly (2) is placed between the two limiting blocks (34). The first limiting coupling part (31) is respectively constructed on one side of the two limiting blocks (34) opposite to the trigger part (35). The top of the two limiting blocks (34) is connected with a reinforcing rib (36). The limiting groove (32) is configured to penetrate the trigger part (35) from the reinforcing rib (36).

9. The adjustable pulley (22) module according to claim 1, characterized in that, The first limiting coupling part (31) is provided with a vertical limiting part (37) that limits the vertical degree of freedom of the bearing guide part (21') coupled thereto.

10. The adjustable pulley (22) module according to claim 1, characterized in that, The pulley (22) has a bearing guide (21) on its end side. The bearing guide (21') is constructed from the outer periphery of the bearing guide (21). The bearing seat (1) has a support member (14) at its bottom. The bearing guide (21) is maintained in the internal space (10) of the bearing seat (1) by the support member (14). The adjustment drive member (5) and the support member (14) are maintained in the internal space (10) in a non-contact manner by the interaction between the bearing guide (21) and the support member (14).

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