Adjustable pulley device and door and window

Abstract

The invention relates to the technical field of door and window accessories, in particular to an adjustable pulley device and a door and window. The adjustable pulley device comprises a shell, at least one pulley module is arranged in the shell, and at least one end of the shell is provided with an adjusting assembly; the pulley module comprises a connecting seat in sliding connection with the shell and a roller in rotating connection with the connecting seat, guide slopes are arranged on the two opposite sides of the connecting seat in the length direction of the shell correspondingly, and guide pieces abutting against the guide slopes are arranged on the two opposite sides of the connecting seat correspondingly; the pulley modules adjacent to the adjusting assembly abut against the adjusting assembly through the corresponding guiding pieces, and when the number of the pulley modules is two or more, the adjacent pulley modules are in linkage through the corresponding guiding pieces. The adjusting assembly is used for adjusting the position of the connecting base relative to the shell so that the pulley module can protrude out of or retract into the shell by a certain distance. The matching degree of the pulley module and the sliding rail at the frame body can be adjusted after the door and window is installed in the frame body, and the smoothness and the safety in the using process are improved.

Description

Technical Field

[0001] The invention relates to the technical field of door and window accessories, in particular to an adjustable pulley device and a door and window. Background Art

[0002] The pulley device is usually fixed at the bottom of the wing of the sliding door and window, and cooperates with the lower guide rail in the door frame or window frame to facilitate the opening and closing of the sliding door and window. As the running part and load-bearing part of the sliding door and window, the pulley device determines the stability and safety of the sliding door and window.

[0003] During the installation of doors and windows, in order to facilitate the loading of doors and windows, there is usually a certain margin between the doors and windows and the frame. If they are too loose during use, it may easily cause uneven force and poor operation of the pulley device, or even derailment of the pulley device, increasing safety hazards. Summary of the invention

[0004] The technical problem to be solved by the embodiments of the present invention is to provide an adjustable pulley device and doors and windows, which can adjust the matching degree between the pulley module and the slide rail at the frame after the doors and windows are installed in the frame, thereby improving the smoothness and safety during use.

[0005] The present invention discloses an adjustable pulley device, comprising: a shell arranged in a long strip shape, at least one pulley module is arranged in the shell along the length direction, and an adjusting component is arranged at at least one end of the shell; the pulley module comprises a connecting seat slidably connected to the shell, and a roller rotatably connected to the connecting seat, the connecting seat is respectively provided with guiding inclined surfaces on opposite sides along the length direction of the shell, and the connecting seat is respectively provided with guiding members abutting against the guiding inclined surfaces on opposite sides; the pulley module adjacent to the adjusting component abuts against the adjusting component through the corresponding guiding members, and when the pulley modules are provided with two or more, the adjacent pulley modules are linked by the corresponding guiding members; the adjusting component is used to adjust the position of the connecting seat relative to the shell, so that the pulley module protrudes or retracts a partial distance of the shell.

[0006] Optionally, the adjustment assembly includes an adjusting member, a limiting member and a sliding block slidably connected to the shell, the sliding block is provided with a through hole and a nut concentrically arranged with the through hole, the adjusting member is threadedly connected to the nut, the limiting member is clamped with the shell, and the limiting member is clamped with the adjusting member, and a first limiting portion for limiting the adjusting member is provided in the shell to limit the axial movement of the adjusting member.

[0007] Optionally, the adjusting member includes a screw rod and a nut arranged at one end of the screw rod, a limiting ring is also arranged on the screw rod, and the limiting ring is clamped between the first limiting portion and the limiting member, and a second limiting portion corresponding to the limiting member is also arranged in the shell so that the limiting member is clamped between the second limiting portion and the limiting ring.

[0008] Optionally, the sliding block is further provided with an arc groove and an arc notch for cooperating with the guide member, the sliding block is further provided with protrusions on opposite sides, the shell is provided with a guide groove arranged along the length direction, and the protrusion is clamped in the guide groove.

[0009] Optionally, sliders and slide grooves are respectively provided on opposite sides of the connecting seat. When the number of the pulley modules is two or more, the sliders of adjacent connecting seats cooperate with the slide grooves.

[0010] Optionally, a brush is also provided on the connecting seat, and the brush is located on opposite sides of the roller. An annular groove is provided on the wheel surface of the roller. The brush corresponds to the annular groove and is inclined toward the side away from the roller so that the direction of the bristles of the brush forms a preset angle with the length direction of the shell.

[0011] Optionally, an inwardly bent edge is provided on one side of the shell opening, and the connecting seat includes a first connecting portion and a second connecting portion which are connected to each other, the first connecting portion is rotatably connected to the roller, and the second connecting portion is connected to the brush, wherein the thickness of the first connecting portion is greater than the thickness of the second connecting portion, the first connecting portion abuts against the inner wall of the shell, and the second connecting portion abuts against the folded edge.

[0012] Optionally, the guide member includes a rectangular block and an arc-shaped top protrusion formed on one side of the rectangular block, wherein the arc-shaped top protrusion is used to abut against the guide slope to form a linear contact with the guide slope, and the side of the rectangular block away from the arc-shaped top protrusion abuts against the bottom of the shell.

[0013] Optionally, when the adjusting assembly is arranged at one end of the shell, a limiting block is arranged at the other end of the shell, the pulley module corresponding to the limiting block is supported against the limiting block through the corresponding guide member, and end caps are arranged on the outer side of the limiting block and the outer side of the adjusting assembly; when the adjusting assemblies are arranged at both ends of the shell, end caps are respectively arranged on the outer sides of the two adjusting assemblies; the end caps are clamped with the shell, and avoidance holes are arranged on the end caps.

[0014] The present invention also discloses a door and window, comprising a frame, sashes of a door or window, and an adjustable pulley device as described in any one of the above, wherein the sashes are connected to the track of the frame through the adjustable pulley device.

[0015] Compared with the prior art, the beneficial effect of the adjustable pulley device and the door and window provided by the embodiment of the present invention is that: through the pulley module set in the shell, the pulley module includes a connection seat slidably connected to the shell, and a roller rotatably connected to the connection seat. When the adjustable pulley device is loaded on the sash of the door or window, it can roll with the frame to reduce the friction when moving the door or window. When it is necessary to adjust the matching distance between the door or window and the corresponding frame, the guide member can be driven to move by the adjustment component. The guide member is located on the opposite sides of the connection seat and is respectively against the guide inclined surface. While pushing the connection seat along the length direction of the shell, the pulley module is driven to protrude or retract the distance of the shell part, thereby meeting the required adjustment requirements. When the pulley module is set to two or more, the adjacent pulley modules are linked by the corresponding guide members to ensure the reliability and synchronization of the pulley module adjustment. With the above form, the matching degree between the pulley module and the slide rail at the frame can be adjusted after the door or window is loaded into the frame, which improves the fluency and safety during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments, in which:

[0017] Figure 1 is a schematic structural diagram of an adjustable pulley device provided by an embodiment of the present invention;

[0018] Figure 2 is an exploded schematic diagram of an adjustable pulley device provided by an embodiment of the present invention;

[0019] Figure 3 is a schematic diagram of the structure of an adjustment component provided by an embodiment of the present invention;

[0020] Figure 4 is a cross-sectional schematic diagram of an adjustable pulley device provided by an embodiment of the present invention;

[0021] Figure 5 is a schematic structural diagram of a housing provided by an embodiment of the present invention;

[0022] Figure 6 It is a schematic diagram of the structure of the coordination of adjacent pulley modules provided by an embodiment of the present invention;

[0023] Figure 7 It is a schematic diagram of the structure of the end cap provided in an embodiment of the present invention.

[0024] The reference numerals in the figures are:

[0025] 100, adjustable pulley device; 110, housing; 112, first limiting portion; 114, second limiting portion; 115, guide groove; 116, folding edge; 117, limiting hole; 118, avoidance groove; 120, pulley module; 122, connecting seat; 1222, guiding inclined surface; 1223, slider; 1224, slide groove; 1225, first connecting portion; 1226, second connecting portion; 124, roller; 126, brush; 130, Adjustment assembly; 132, adjustment member; 1322, screw; 1324, nut; 1326, limit ring; 134, limit member; 136, sliding block; 1362, through hole; 1242, annular groove; 1363, arc groove; 1364, arc notch; 1365, protrusion; 138, nut; 140, guide member; 142, rectangular block; 144, arc-shaped top protrusion; 150, end cap; 152, avoidance hole; 154, buckle. DETAILED DESCRIPTION

[0026] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. Now, in conjunction with the accompanying drawings, the preferred embodiments of the present invention are described in detail.

[0027] like Figure 1 and Figure 2 As shown, an embodiment of the present invention provides an adjustable pulley device 100, comprising: a housing 110 arranged in an elongated strip shape, at least one pulley module 120 arranged in the housing 110 along the length direction, and an adjustment assembly 130 arranged at at least one end of the housing 110; the pulley module 120 comprises a connecting seat 122 slidably connected to the housing 110, and a roller 124 rotatably connected to the connecting seat 122, and the connecting seat 122 is respectively provided with guide inclined surfaces 1222 on opposite sides along the length direction of the housing 110, The connecting seat 122 is provided with guide members 140 on opposite sides thereof, which are respectively supported against the guide slope 1222; the pulley module 120 adjacent to the adjusting assembly 130 is supported against the adjusting assembly 130 through the corresponding guide members 140. When two or more pulley modules 120 are provided, the adjacent pulley modules 120 are linked with each other through the corresponding guide members 140; the adjusting assembly 130 is used to adjust the position of the connecting seat 122 relative to the shell 110, so that the pulley module 120 protrudes or retracts a part of the distance of the shell 110.

[0028] Specifically, by arranging at least one pulley module 120 in the shell 110, and arranging an adjusting component 130 at at least one end of the shell 110, when the adjusting component 130 cooperates with the pulley module 120, in order to ensure the smoothness of pushing the pulley module 120, guide slopes 1222 are respectively arranged on the opposite sides of the connecting seat 122 along the length direction of the shell 110, and guide members 140 that abut against the guide slopes 1222 are respectively arranged on the opposite sides of the connecting seat 122. When the force transmitted to the guide members 140 and then acts on the guide slopes 1222, the connecting seat 122 can receive a separation extending along the length direction of the shell 110 and a component force perpendicular to the length direction of the shell 110, so that while pushing the connecting seat 122 to move along the length direction of the shell 110, the connecting seat 122 can also be moved in a direction perpendicular to the length direction of the shell 110, so that the pulley module 120 protrudes or retracts a part of the distance of the shell 110. It is understandable that when there are two or more pulley modules 120, the adjacent pulley modules 120 are linked by corresponding guide members 140, which can ensure the consistency of force and movement of all pulley modules 120, so as to achieve simultaneous adjustment of all pulley modules 120. In addition, the roller 124 can be a rubber wheel, a metal wheel or a bearing, which can be flexibly set according to actual needs.

[0029] The adjustable pulley device 100 provided in the embodiment of the present application has a pulley module 120 disposed in the housing 110. The pulley module 120 includes a connection seat 122 slidably connected to the housing 110, and a roller 124 rotatably connected to the connection seat 122. When the adjustable pulley device 100 is loaded onto the sash of a door or window, it can roll with the frame to reduce the friction when the door or window is moved. When it is necessary to adjust the matching distance between the door or window and the corresponding frame, the guide member 140 can be driven to move by the adjustment component 130. The guide member 140 is located on opposite sides of the connection seat 122 and respectively abuts against the guide slope 1222. It can push the connection seat 122 along the length direction of the housing 110 while driving the pulley module 120 to protrude or retract a part of the housing 110, thereby meeting the required adjustment requirements. When there are two or more pulley modules 120, adjacent pulley modules 120 are linked by corresponding guide members 140 to ensure the reliability and synchronization of the adjustment of the pulley modules 120. With the above form, the matching degree between the pulley module 120 and the slide rail at the frame can be adjusted after the door and window are installed in the frame, thereby improving the smoothness and safety during use.

[0030] like Figure 1 , Figure 3 and Figure 4As shown, the adjustment assembly 130 includes an adjustment member 132, a limit member 134 and a sliding block 136 slidably connected to the shell 110, the sliding block 136 is provided with a through hole 1362 and a nut 138 concentrically arranged with the through hole 1362, the adjustment member 132 is threadedly connected to the nut 138, the limit member 134 is clamped with the shell 110, and the limit member 134 is clamped with the adjustment member 132, and a first limit portion 112 is provided in the shell 110 to limit the axial movement of the adjustment member 132.

[0031] Specifically, the sliding block 136 is slidably connected to the housing 110, and the adjusting member 132 is threadedly connected to the sliding block 136 through a nut 138, and the sliding block 136 can be slid along the length direction of the housing 110 by rotating the adjusting member 132. In this way, the movement of the sliding block 136 can be adjusted by the adjusting member 132, thereby driving the pulley module 120 to move. It should be noted that when the sliding block 136 is driven to move by the adjusting member 132, it is necessary to ensure that the adjusting member 132 only has rotation and cannot move axially. In this embodiment, the axial movement of the adjusting member 132 is limited by the cooperation of the first limiting portion 112 and the limiting member 134. Among them, the first limiting portion 112 can be formed into a concave convex rib in the form of stamping, and the limiting member 134 is engaged with the housing 110 to ensure stability relative to the housing 110, thereby limiting the axial movement of the adjusting member 132 to ensure stability during adjustment. In addition, the through hole 1362 provided in the sliding block 136 is used to reserve space for the adjusting member 132 to move relative to the sliding block 136 so as to avoid interference when the adjusting member 132 cooperates with the sliding block 136 .

[0032] like Figure 2 and Figure 4 As shown, the adjusting member 132 includes a screw rod 1322 and a nut 1324 arranged at one end of the screw rod 1322. A limiting ring 1326 is also arranged on the screw rod 1322. The limiting ring 1326 is clamped between the first limiting portion 112 and the limiting member 134. A second limiting portion 114 corresponding to the limiting member 134 is also arranged in the shell 110, so that the limiting member 134 is clamped between the second limiting portion 114 and the limiting ring 1326.

[0033] Specifically, by providing a nut 1324 at one end of the screw rod 1322, it is convenient to rotate the adjusting member 132 with the help of a tool when adjusting the adjustable pulley device 100, making the adjustment process more convenient and labor-saving. By providing a limiting ring 1326 on the screw rod 1322, it is convenient to cooperate with the first limiting portion 112 and the limiting member 134 to position. In addition, the second limiting portion 114 can also be formed into a concave convex rib in the form of stamping. Along the length direction of the housing 110, the first limiting portion 112, the limiting ring 1326, the limiting member 134 and the second limiting portion 114 are sequentially provided to form a limit to the limiting ring 1326, thereby limiting the axial movement of the adjusting member 132.

[0034] like Figure 3 As shown, the sliding block 136 is also provided with an arc groove 1363 and an arc notch 1364 for cooperating with the guide member 140, and protrusions 1365 are also provided on the opposite sides of the sliding block 136. The shell 110 is provided with a guide groove 115 arranged along the length direction, and the protrusion 1365 is clamped in the guide groove 115.

[0035] Specifically, the arc groove 1363 provided on the sliding block 136 extends along the length direction of the housing 110, so as to cooperate with the guide rail provided on the frame, so as to avoid excessive pressure on the sliding block 136 by the guide rail, which affects the smoothness of the sliding of the sliding block 136. In addition, the arc notch 1364 provided on the sliding block 136 for cooperating with the guide member 140 can better fit with the guide member 140 to ensure smoothness during movement. The protrusions 1365 provided on the opposite sides of the sliding block 136 are clamped in the guide groove 115 of the housing 110, which is conducive to ensuring the straightness of the sliding block 136 when sliding, and avoiding the problem of increased resistance caused by the deflection of the sliding direction of the sliding block 136.

[0036] like Figure 6 As shown, sliders 1223 and slide grooves 1224 are respectively provided on opposite sides of the connecting seat 122. When two or more pulley modules 120 are provided, the sliders 1223 and slide grooves 1224 of adjacent connecting seats 122 cooperate with each other.

[0037] Specifically, by respectively providing the sliders 1223 and the slide grooves 1224 on the opposite sides of the connecting seat 122, adjacent connecting seats 122 can be engaged with each other through the matching sliders 1223 and the slide grooves 1224 to ensure the correlation between the connecting seats 122, which is beneficial to ensure the synchronization of the movements.

[0038] like Figure 6As shown, a brush 126 is also provided on the connecting seat 122. The brush 126 is located on opposite sides of the roller 124. An annular groove 1242 is provided on the wheel surface of the roller 124. The brush 126 corresponds to the annular groove 1242 and is inclined toward the side away from the roller 124 so that the direction of the bristles of the brush 126 forms a preset angle with the length direction of the shell 110.

[0039] Specifically, by arranging the brush 126 on the connecting seat 122, it is helpful to clean the track arranged on the frame to ensure the stability during sliding. In addition, the brush 126 is located on the opposite sides of the roller 124, which can prevent the debris on the track from accidentally being involved in the interior of the pulley module 120 to ensure the stability during movement. Among them, the brush 126 corresponds to the annular groove 1242, and is inclined to the side away from the roller 124, so that the direction of the bristles of the brush 126 and the length direction of the shell 110 are at a preset angle, which is conducive to the bristles being able to apply a greater force to the track to ensure the cleaning effect. The annular groove 1242 arranged on the wheel surface of the roller 124 is to be stuck into the track when cooperating with the track, to avoid accidental detachment from the track when sliding relative to the track, which is conducive to ensuring safety during use.

[0040] like Figure 5 and Figure 6 As shown, an inwardly bent edge 116 is provided on one side of the opening of the shell 110, and the connecting seat 122 includes a first connecting portion 1225 and a second connecting portion 1226 which are connected to each other, the first connecting portion 1225 is rotatably connected to the roller 124, and the second connecting portion 1226 is connected to the brush 126, wherein the thickness of the first connecting portion 1225 is greater than the thickness of the second connecting portion 1226, the first connecting portion 1225 abuts against the inner wall of the shell 110, and the second connecting portion 1226 abuts against the folded edge 116.

[0041] Specifically, by setting the connecting seat 122 in the form of a first connecting part 1225 and a second connecting part 1226 that are connected to each other, the installation of the roller 124 and the brush 126 is facilitated, and the thickness of the first connecting part 1225 is greater than the thickness of the second connecting part 1226. The first connecting part 1225 abuts against the inner wall of the shell 110, and the second connecting part 1226 abuts against the folded edge 116. The shell 110 can provide a certain damping effect on the connecting seat 122, and before the adjustable pulley device 100 is loaded onto the wing of the door or window, the stability of the current relative position relationship is guaranteed.

[0042] In addition, in order to allow the roller 124 to have a larger diameter, a through hole 1362 may be provided on the first connecting portion 1225 so that a portion of the roller 124 can pass through the top of the first connecting portion 1225. Figure 2As shown, a corresponding avoidance groove 118 may be provided on the housing 110 to avoid friction with the housing 110. It is understandable that the roller 124 cannot pass over the housing 110 to avoid interference with the sash of the door or window during assembly.

[0043] like Figure 6 As shown, the guide member 140 includes a rectangular block 142 and an arc-shaped top protrusion 144 formed on one side of the rectangular block 142. The arc-shaped top protrusion 144 is used to abut against the guide slope 1222 to form a linear contact with the guide slope 1222. The side of the rectangular block 142 away from the arc-shaped top protrusion 144 abuts against the bottom of the shell 110.

[0044] Specifically, the arc-shaped top protrusion 144 formed on one side of the rectangular block 142 facilitates the guide member 140 to abut against the guide inclined surface 1222 through the arc-shaped top protrusion 144. At this time, the arc-shaped top protrusion 144 and the guide inclined surface 1222 can form a line contact form to reduce the friction force at the contact position. In addition, the side of the rectangular block 142 away from the arc-shaped top protrusion 144 abuts against the bottom of the housing 110, which is conducive to ensuring the stability of the guide member 140 when it cooperates with the connecting seat 122, so as to ensure stable support.

[0045] In an optional embodiment of the present application, Figure 4 , Figure 5 and Figure 7 As shown, when an adjusting assembly 130 is provided at one end of the shell 110, a limiting block is provided at the other end of the shell 110, and the pulley module 120 corresponding to the limiting block is supported against the limiting block through the corresponding guide member 140, and end caps 150 are provided on the outer side of the limiting block and the outer side of the adjusting assembly 130; when adjusting assemblies 130 are provided at both ends of the shell 110, end caps 150 are respectively provided on the outer sides of the two adjusting assemblies 130; the end caps 150 are clamped with the shell 110, and avoidance holes 152 are provided on the end caps 150.

[0046] Specifically, when the adjustment assembly 130 is provided at one end of the housing 110, in order to ensure reliable limiting of the pulley module 120, a limiting block needs to be provided at the other end of the housing 110. At this time, the pulley module 120 corresponding to the limiting block abuts against the limiting block through the corresponding guide member 140. End caps 150 are provided on the outer side of the limiting block and the outer side of the adjustment assembly 130 to support the housing 110, thereby ensuring the supporting strength of the housing 110. When the adjustment assembly 130 is provided at both ends of the housing 110, end caps 150 are provided on the outer sides of the two adjustment assemblies 130 respectively. In order to prevent the provided nut 1324 from affecting the adjustment of the adjustment assembly 130, a avoidance hole 152 can be provided on the end cap 150, so that the tool can pass through the end cap 150 to adjust the adjustment assembly 130. The end cap 150 is provided with a buckle 154 , and the shell 110 is correspondingly provided with a limit hole 117 . During assembly, the end cap 150 only needs to be inserted from the end of the shell 110 , and the limit hole 117 and the buckle 154 are locked.

[0047] The present invention also discloses a door and window, comprising a frame, a sash of a door or window, and the adjustable pulley device 100 in the aforementioned embodiment, wherein the sash is connected to the track of the frame through the adjustable pulley device 100. The door and window comprises the same structure and beneficial effects as the adjustable pulley assembly device in the aforementioned embodiment. The structure and beneficial effects of the adjustable pulley device 100 have been described in detail in the aforementioned embodiment, and will not be repeated here.

[0048] It should be understood that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. For those skilled in the art, the technical solutions described in the above embodiments can be modified, or some of the technical features therein can be replaced by equivalents; and all these modifications and replacements should fall within the scope of protection of the claims attached to the present invention.

Claims

1. An adjustable pulley device, characterized in that: include: A housing arranged in an elongated strip shape, wherein at least one pulley module is arranged in the housing along the length direction, and an adjustment component is arranged at at least one end of the housing; The pulley module comprises a connection seat slidably connected to the housing, and a roller rotatably connected to the connection seat, the connection seat is provided with guide inclined surfaces on opposite sides along the length direction of the housing, and the connection seat is provided with guide members abutting against the guide inclined surfaces on opposite sides; The pulley module adjacent to the adjustment component is abutted against the adjustment component through the corresponding guide member. When there are two or more pulley modules, the adjacent pulley modules are linked through the corresponding guide member. The adjusting assembly is used to adjust the position of the connecting seat relative to the housing so that the pulley module protrudes or retracts a partial distance of the housing.

2. The adjustable pulley device according to claim 1, characterized in that: The adjustment assembly includes an adjustment member, a limit member and a sliding block slidably connected to the shell, the sliding block is provided with a through hole and a nut concentrically arranged with the through hole, the adjustment member is threadedly connected to the nut, the limit member is clamped with the shell, and the limit member is clamped with the adjustment member, and a first limit portion for limiting the adjustment member is provided in the shell to limit the axial movement of the adjustment member.

3. The adjustable pulley device according to claim 2, characterized in that: The adjusting member includes a screw rod and a nut arranged at one end of the screw rod. A limiting ring is also arranged on the screw rod, and the limiting ring is clamped between the first limiting portion and the limiting member. A second limiting portion corresponding to the limiting member is also arranged in the shell, so that the limiting member is clamped between the second limiting portion and the limiting ring.

4. The adjustable pulley device according to claim 3, characterized in that: The sliding block is also provided with an arc-shaped groove and an arc-shaped notch for cooperating with the guide member. The sliding block is also provided with protrusions on opposite sides. The shell is provided with a guide groove arranged along the length direction, and the protrusion is clamped in the guide groove.

5. The adjustable pulley device according to any one of claims 2 to 4, characterized in that: Slide blocks and slide grooves are respectively arranged on opposite sides of the connecting seat. When the pulley modules are arranged in two or more, the slide blocks of the adjacent connecting seats are matched with the slide grooves.

6. The adjustable pulley device according to claim 5, characterized in that: A brush is also provided on the connecting seat, and the brush is located on opposite sides of the roller. An annular groove is provided on the wheel surface of the roller. The brush corresponds to the annular groove and is inclined to the side away from the roller so that the direction of the bristles of the brush forms a preset angle with the length direction of the shell.

7. The adjustable pulley device according to claim 6, characterized in that: A folded edge bent inward is provided on one side of the shell opening, and the connecting seat includes a first connecting part and a second connecting part connected to each other, the first connecting part is rotatably connected to the roller, and the second connecting part is connected to the brush, wherein the thickness of the first connecting part is greater than the thickness of the second connecting part, the first connecting part abuts against the inner wall of the shell, and the second connecting part abuts against the folded edge.

8. The adjustable pulley device according to claim 5, characterized in that: The guide member includes a rectangular block and an arc-shaped top protrusion formed on one side of the rectangular block, wherein the arc-shaped top protrusion is used to abut against the guide slope to form a linear contact with the guide slope, and the side of the rectangular block away from the arc-shaped top protrusion abuts against the bottom of the shell.

9. The adjustable pulley device according to any one of claims 1 to 4, characterized in that: When the adjusting assembly is arranged at one end of the shell, a limiting block is arranged at the other end of the shell, and the pulley module corresponding to the limiting block is supported by the limiting block through the corresponding guide member, and end caps are arranged on the outer side of the limiting block and the outer side of the adjusting assembly; when the adjusting assembly is arranged at both ends of the shell, end caps are respectively arranged on the outer sides of the two adjusting assemblies; the end caps are clamped with the shell, and avoidance holes are arranged on the end caps.

10. A door and window, characterized in that: It comprises a frame, a door or a window wing, and the adjustable pulley device according to any one of claims 1 to 9, wherein the wing is connected to the track of the frame through the adjustable pulley device.

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