Double pulley arrangement, window and door

Abstract

The present application relates to the technical field of pulley device, and particularly relates to a double-row pulley device, a window and a door. The double-row pulley device comprises a pulley device main body and a swing piece. The pulley device main body comprises a shell and two pulley assemblies arranged on the shell. The two pulley assemblies are arranged in the width direction of the shell. The swing piece is swingably arranged on the shell, and the swing axis of the swing piece is arranged along the length direction of the shell. In the width direction of the shell, the swing axis is located between the two pulley assemblies. The swing piece is used for being connected with or integrally formed with the window main body and the door main body. In this way, the size deviation caused by the machining tolerance and the assembly cumulative error can be compensated by the self-adaptive swing of the swing piece, the unilateral load and uneven force of the two pulley assemblies can be avoided, the excessive wear of the unilateral pulley assembly can be effectively reduced, the overall service life of the double-row pulley device can be prolonged, and the device failure rate and the later maintenance cost can be reduced.

Description

Technical Field

[0001] This invention relates to the field of pulley device technology, and in particular to a double-row pulley device, window and door. Background Technology

[0002] Due to the influence of product processing tolerances and cumulative assembly errors, the pulley assemblies on both sides of the existing double-row pulley system are difficult to achieve uniform force distribution. Long-term use can easily lead to excessive wear of the pulleys on one side, resulting in a short service life, high failure rate, and high maintenance costs for the existing double-row pulley system. Summary of the Invention

[0003] This invention provides a double-row pulley device to solve the problem that it is difficult to achieve uniform force distribution on the pulley assemblies on both sides of the double-row pulley device.

[0004] In a first aspect, embodiments of the present invention provide a double-row pulley device, including a pulley device body and a swing member. The pulley device body includes a housing and two pulley assemblies disposed on the housing. The two pulley assemblies are arranged in the width direction of the housing. The swing member is swingably disposed on the housing, and the swing axis of the swing member is disposed along the length direction of the housing. In the width direction of the housing, the swing axis is located between the two pulley assemblies. The swing member is used to connect with or integrally form with a window body or a door body.

[0005] Optionally, the swing member has one of a protrusion structure and a groove structure, and the housing has the other of a protrusion structure and a groove structure. The protrusion structure is used to cooperate with the groove structure so that the swing member can be swingably disposed on the housing. A limiting surface is provided next to one of the protrusion structure and the groove structure, and a shoulder is provided next to the other of the protrusion structure and the groove structure. There is a swing amplitude gap between the limiting surface and the shoulder. The limiting surface is used to cooperate with the shoulder to limit the maximum swing amplitude of the swing member.

[0006] Optionally, the protrusion structure is an arc-shaped swing block, and the groove structure is an arc-shaped groove.

[0007] Optionally, the arc-shaped groove is a constricted arc-shaped groove to restrict the arc-shaped swing block from disengaging from the opening of the arc-shaped groove.

[0008] Optionally, the length of the groove structure is greater than the length of the protrusion structure.

[0009] Optionally, the length of the groove structure is not less than the length of the protrusion structure, and the ratio of the length of the protrusion structure to the length of the shell is greater than or equal to 4:5.

[0010] Optionally, the protrusion structure is a triangular pendulum block, and the groove structure is a triangular groove.

[0011] Optionally, the swing member further includes a connecting block, the protrusion structure is connected to the bottom of the connecting block in the central region of the width direction of the housing, and the limiting surface is disposed at the bottom of the connecting block; a protrusion is provided on the top side of the housing, and the groove structure and the shoulder are disposed on the protrusion.

[0012] In a second aspect, the present invention also discloses a window that includes the double-row pulley device shown in the first aspect above.

[0013] Thirdly, the present invention also discloses a door that includes the double-row pulley device shown in the first aspect above.

[0014] The beneficial effects of the double-row pulley device provided in this embodiment of the invention are as follows: This embodiment of the invention provides a swingable component on the housing of the pulley device body. The swing component is used to connect to or integrally form with the window body or door body. The swing axis of the swing component is arranged along the length direction of the housing, and in the width direction of the housing, the swing axis is located between the two pulley assemblies. This allows the double-row pulley device to compensate for dimensional deviations caused by machining tolerances and accumulated assembly errors during assembly and use, by utilizing the adaptive swing of the swing component. This avoids uneven loading and stress on one side of the two pulley assemblies, thereby effectively reducing excessive wear on one side of the pulley assembly, extending the overall service life of the double-row pulley device, and reducing the device failure rate and subsequent maintenance costs. Attached Figure Description

[0015] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0016] Figure 1 This is a schematic diagram of the double-row pulley device provided in an embodiment of the present invention; Figure 2 yes Figure 1 A schematic diagram of the double-row pulley device from another angle; Figure 3 yes Figure 1 Side view of the double-row pulley system shown; Figure 4 This is a schematic diagram of the structure of the connecting block and the sliding groove on the door / window body provided in the embodiment of the present invention; Figure 5 yes Figure 1 The diagram shows the structure of the double-row pulley device after omitting some parts of the structure. Figure 6 yes Figure 5 Enlarged view of a portion of position A in the middle; Figure 7 This is an exploded view of the first extrusion member, screw, and slider provided in an embodiment of the present invention; Figure 8 yes Figure 1 A cross-sectional view of the double-row wheel assembly shown; Figure 9 This is a schematic diagram of the shell structure provided in an embodiment of the present invention; Figure 10 yes Figure 5 Enlarged view of a portion of position B in the middle; Figure 11 yes Figure 5 Enlarged view of the middle C position; Figure 12 This is a simplified structural diagram of the protrusion structure being a triangular pendulum block and the groove structure being a triangular groove, provided in an embodiment of the present invention.

[0017] The labels for the attached figures are as follows: 1000. Double-row pulley system; 100. Main body of pulley device; 110. Housing; 111. Groove structure; 112. Top side; 1121. Receiving groove; 1122. Protrusion; 11221. Shoulder; 113. Bottom side; 114. Receiving space; 120. Pulley assembly; 121. First inclined surface; 122. Pulley module; 1221. Second inclined surface; 1222. Second extrusion piece; 1223. Connecting seat; 1224. Roller; 123. Third inclined surface; 130. First extrusion piece; 140. Adjustment structure; 141. Screw; 142. Slider; 1421. Threaded hole; 140. Third extrusion piece; 200. Swinging component; 210. Protruding structure; 220. Connecting block; 221. Central area; 222. Limiting surface; 2000, Slide. Detailed Implementation

[0018] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0019] This invention provides a double-row pulley device 1000, such as... Figures 1-4 As shown, the double-row pulley device 1000 includes a pulley device body 100 and a swing member 200. The pulley device body 100 includes a housing 110 and two pulley assemblies 120 disposed on the housing 110. The two pulley assemblies 120 are positioned in the width direction of the housing 110 (see reference). Figure 1 Arranged along the X direction, the swing member 200 is oscillatingly disposed on the housing 110, and the swing axis of the swing member 200 is along the length direction of the housing 110 (refer to the X direction). Figure 1In the Y direction of the housing 110, the swing axis is located between two pulley assemblies 120 in the width direction of the housing 110, and the swing member 200 is used to connect with the window body and the door body or be integrally formed.

[0020] In this embodiment, a swinging member 200 is provided on the housing 110 of the pulley device body 100. The swinging member 200 is used to connect with or be integrally formed with the window body or door body. The swinging axis of the swinging member 200 is arranged along the length direction of the housing 110, and in the width direction of the housing 110, the swinging axis is located between the two pulley assemblies 120. This allows the double-row pulley device 1000 to compensate for dimensional deviations caused by machining tolerances and cumulative assembly errors during assembly and use by means of the adaptive swinging of the swinging member 200. This avoids the situation of one-sided load and uneven force on the two pulley assemblies 120, thereby effectively reducing excessive wear of the pulley assembly 120 on one side, extending the overall service life of the double-row pulley device 1000, and reducing the device failure rate and subsequent maintenance costs.

[0021] refer to Figures 1-3 In a specific embodiment, the swing member 200 is provided with one of a groove structure 111 and a protrusion structure 210, and the housing 110 is provided with the other of the groove structure 111 and the protrusion structure 210. That is, the swing member 200 can be configured to have its own protrusion structure 210 and the housing 110 to have a corresponding groove structure 111, or the swing member 200 can be configured to have its own groove structure 111 and the housing 110 to have a corresponding protrusion structure 210. The protrusion structure 210 and the groove structure 111 cooperate to allow the swing member 200 to be swingably disposed on the housing 110. A limiting surface 222 is provided next to one of the protrusion structure 210 and the groove structure 111, and a shoulder 11221 is provided next to the other of the protrusion structure 210 and the groove structure 111. There is a swing amplitude gap between the limiting surface 222 and the shoulder 11221. The limiting surface 222 is used to cooperate with the shoulder 11221 to limit the maximum swing amplitude of the swing member 200.

[0022] This embodiment demonstrates a specific implementation of a swing member 200 that is swingably disposed on a housing 110. Specifically, the swing member 200 and the housing 110 are connected by a groove structure 111 and a protrusion structure 210, and the maximum swing amplitude of the swing member 200 is limited by the cooperation of the limiting surface 222 and the shoulder 11221.

[0023] refer to Figures 1-3 In a specific embodiment, the protrusion structure 210 is an arc-shaped swing block, and the groove structure 111 is an arc-shaped groove.

[0024] Specifically, this embodiment relies on the guide of the contact between the arc-shaped groove and the arc-shaped swing block to achieve the swing motion. The swing process is smooth and stable, and it is not easy to encounter problems such as jamming or shaking. The arc-shaped fit structure has a mature processing technology, which can stably realize the swing function of the swing component 200 relative to the housing 110, further ensuring that the two pulley assemblies 120 are subjected to uniform force and improving the operational stability of the device.

[0025] refer to Figures 1-3 In a specific embodiment, the arc groove is a constricted arc groove to prevent the arc-shaped swing block from detaching from the opening of the arc groove.

[0026] Specifically, the narrowed arc groove, where the width of the opening is smaller than the diameter, allows the smaller diameter opening to constrain the arc-shaped swing block, effectively preventing it from detaching from the opening of the arc groove. This ensures the reliability of the swing connection between the swinging component 200 and the housing 110, avoids the failure of the double-row pulley device 1000 due to the arc-shaped swing block detaching from the arc groove, and further improves the overall structural stability and safety of the device.

[0027] refer to Figure 1 In some embodiments, the length of the groove structure 111 is greater than the length of the protrusion structure 210.

[0028] Specifically, setting the length of the groove structure 111 to be greater than the length of the protrusion structure 210 effectively compensates for length tolerances and cumulative assembly errors generated during part processing, completely avoiding the problem of the protrusion structure 210 protruding from the end face of the groove structure 111 due to processing deviations. If the protrusion structure 210 protrudes from the groove structure 111, the actual contact area between the two will be smaller than the designed contact area, leading to increased local stress, decreased load-bearing capacity, and accelerated abnormal wear of the mating surfaces. This structure, by reserving a length allowance, ensures that the protrusion structure 210 is always fully contained within the groove structure 111, maintaining the designed load-bearing performance and oscillation stability.

[0029] refer to Figure 1 In some embodiments, the length of the groove structure 111 is not less than the length of the protrusion structure 210, and the ratio of the length of the protrusion structure 210 to the length of the housing 110 is greater than or equal to 4:5.

[0030] Specifically, the weight of the door and window bodies is transferred to the pulley device body 100 through the contact between the protruding structure 210 and the groove structure 111. If the lengths of the protruding structure 210 and the groove structure 111 are insufficient, the load will be concentrated, easily causing plastic deformation or even cracking, reducing the load-bearing capacity and service life of the double-row pulley device. In this embodiment, the length of the groove structure 111 is limited to be no less than the length of the protruding structure 210, and the ratio of the length of the protruding structure 210 to the length of the shell 110 is limited to be no less than 4:5. This ensures sufficient load-bearing length, evenly transferring the weight from the door and window bodies to the shell 110, further enhancing the overall structural strength and operational stability of the double-row pulley device 1000.

[0031] refer to Figure 12 In some embodiments, the protrusion structure 210 is a triangular swing block, and the groove structure 111 is a triangular groove. This arrangement also allows the protrusion structure 210 and the groove structure 111 to cooperate, so that the swing member 200 can be swingably disposed on the housing 110.

[0032] refer to Figures 1-3 In some embodiments, the housing 110 includes, in its height direction (reference 2), Figure 1 The top side 112 and bottom side 113 are arranged opposite to each other in the Z direction (as shown), two pulley assemblies 120 extend out of the bottom side 113, and the swing member 200 is swingably connected to the top side 112.

[0033] Two pulley assemblies 120 extend from the bottom side 113 of the housing 110 to facilitate rolling with the guide rails on the door frame and window frame. Since the door body and window body are located on the top of the double-row pulley device 1000, the swing member 200 is located on the top side 112 of the housing 110 to facilitate connection with the body and window body.

[0034] refer to Figures 1-3 In a specific embodiment, the top side 112 is provided with a receiving groove 1121, and the swing member 200 is disposed in the receiving groove 1121.

[0035] Specifically, a receiving groove 1121 is provided on the top side 112 of the housing 110 and the swing member 200 is placed therein, which can shield and protect the swing member 200, reduce the entry of external dust and debris into the swing mating parts and affect the smoothness of the swing, and at the same time make the overall appearance of the device more flat and beautiful. Therefore, implementing this embodiment can improve the overall texture and durability of the double row pulley device 1000.

[0036] refer to Figures 1-4In some embodiments, the swing member 200 further includes a connecting block 220, a protrusion structure 210 connected to the bottom of the connecting block 220 in the central region 221 of the housing 110 in the width direction, and a limiting surface 222 disposed at the bottom of the connecting block 220; a protrusion 1122 is provided on the top side 112 of the housing 110, and a groove structure 111 and a shoulder 11221 are disposed on the protrusion 1122.

[0037] Specifically, the connecting block 220 is used to connect to or integrally form with the door body or window body.

[0038] For example, refer to Figure 4 The window body and door body are provided with a sliding groove 2000 that is compatible with the connecting block 220. The connecting block 220 can be connected to the window body and door body by sliding into the sliding groove 2000.

[0039] In another example, the window body and the door body have metal sash frames, and the connecting block 220 can be integrally formed into the metal sash frames of the window body and the door body.

[0040] refer to Figures 5-7 In some embodiments, the pulley device body 100 further includes a first pressing member 130 and an adjusting structure 140. Two pulley assemblies 120 are movable relative to the housing 110 in the height direction; each pulley assembly 120 has a first inclined surface 121 at one end in the length direction of the housing 110. The first pressing member 130 is movably disposed on the housing 110 in the length direction of the housing 110, and abuts against the two first inclined surfaces 121. The adjusting structure 140 is disposed at one end in the length direction of the housing 110, and can act on the first pressing member 130 to move the first pressing member 130 toward the first inclined surface 121, increasing the distance the two pulley assemblies 120 extend beyond the housing 110.

[0041] Specifically, during the actual installation of doors and windows, installers typically leave a certain gap between the door / window body and the frame to facilitate loading, positioning, and initial adjustment. However, this gap can easily lead to loosening of the pulley system during long-term use, severely compromising the user experience and the overall reliability of the product.

[0042] By implementing this embodiment, the distance between the two pulley assemblies 120 extending out of the housing 110 can be adjusted, thereby effectively eliminating clearance.

[0043] Furthermore, in this embodiment, by employing a first pressing member 130 to simultaneously abut against the first inclined surfaces 121 of the two pulley assemblies 120, when the adjusting structure 140 drives the first pressing member 130 to move along the length direction of the housing 110, the first pressing member 130 will simultaneously apply pressing force to the two first inclined surfaces 121, forcing the two pulley assemblies 120 to move synchronously. Therefore, it can effectively improve the consistency of the adjustment amount of the two pulley assemblies 120, reduce asymmetrical loads, and improve the stability and service life of the double-row pulley device 1000.

[0044] refer to Figures 5-7 In a specific embodiment, the adjustment structure 140 includes a screw 141 and a slider 142. The screw 141 is rotatably disposed at one end of the housing 110. The slider 142 is slidably disposed on the housing 110 along the length of the housing 110. The slider 142 is provided with a threaded hole 1421. The screw 141 passes through the threaded hole 1421. The slider 142 acts on the first pressing member 130.

[0045] By providing a rotatable screw 141 at one end of the housing 110 and having it pass through the threaded hole 1421 of the slider 142, the rotational motion of the screw 141 can be precisely converted into the linear sliding of the slider 142 along the length of the housing 110 when the screw 141 is rotated. Since the slider 142 acts on the first pressing member 130, the linear motion of the slider 142 directly drives the first pressing member 130 to move synchronously. The first pressing member 130 abuts against the first inclined surface 121 of the two pulley assemblies 120. Therefore, when the first pressing member 130 moves, it can simultaneously and uniformly act on the first inclined surface 121 of the two pulley assemblies 120, forcing the two pulley assemblies 120 to move synchronously in the height direction of the housing 110, thereby achieving synchronous and precise adjustment of the distance of the two pulley assemblies 120 extending out of the housing 110. This adjustment method effectively improves the consistency of the adjustment amount of the pulley assembly 120, reduces asymmetrical load, and improves the stability and service life of the double-row pulley device 1000.

[0046] It is worth mentioning that when the pulley assembly 120 extends excessively beyond the housing 110, or when it is necessary to disassemble the door body or window body, the screw 141 can be rotated in the opposite direction. At this time, the slider 142 will retract in a direction away from the first inclined surface 121. The first pressing member 130 is subjected to the gravity of the door body or window body and retracts along with the slider 142, thereby achieving the technical effect of reducing the distance of the pulley assembly 120 extending beyond the housing 110, so as to facilitate the disassembly of the door body or window body.

[0047] refer to Figure 10In some embodiments, each pulley assembly 120 includes a plurality of separately arranged pulley modules 122. The plurality of pulley modules 122 are distributed along the length of the housing 110 and are all movable relative to the housing 110 in the height direction. Each pulley module 122 has a second inclined surface 1221 on one side facing the adjacent pulley module 122. A second pressing member 1222 is provided between any two adjacent second inclined surfaces 1221 and abuts against the two second inclined surfaces 1221.

[0048] Multiple pulley modules 122 form multiple contact points with the guide rail, which can evenly distribute the weight of the door and window to each contact point, significantly reducing the pressure on a single pulley module 122 and effectively extending the service life of the pulleys. The pulley assembly 120 includes multiple pulley modules 122 distributed along the length direction, thus improving the load-bearing capacity and operational stability of the double-row pulley device 1000. All pulley modules 122 can move relative to the housing 110 in both the height and width directions. Adjacent pulley modules 122 cooperate with each other through a second pressing member 1222 and a second inclined surface 1221. Therefore, when the first pressing member 130 pushes one pulley assembly 120, the other pulley assemblies 120 can move synchronously by cooperating with the second pressing member 1222, ensuring the consistency of the extension distance of each pulley module 122 on the same pulley assembly 120 and avoiding uneven force and abnormal operating noise caused by a single pulley module 122 being suspended.

[0049] It is worth mentioning that by implementing this embodiment, the extension amount of the pulley assembly 120 can be adjusted more precisely. Specifically, if multiple pulley modules 122 are fixed to each other, the pulley modules 122 can only move in the height direction of the housing 110. However, in this embodiment, the multiple pulley modules 122 are independent of each other. When the first pulley module 122 is subjected to pressure from the first pressing member 130, all pulley modules 122 will not only move in the height direction of the housing 110, but also in the length direction of the housing 110. This also makes the distance that the pulley module 122 moves in the height direction smaller when the first pressing member 130 moves the same distance. Therefore, by implementing this embodiment, the extension amount of the pulley assembly 120 can be adjusted more precisely.

[0050] For example, the number of pulley modules 122 can be two, four, six, seven, eight, etc., and this embodiment does not limit it.

[0051] refer to Figures 5-10Furthermore, the pulley module 122 includes a connecting seat 1223 and a roller 1224 rotatably disposed on the connecting seat 1223. A second inclined surface 1221 is disposed on the connecting seat 1223. The housing 110 has an accommodating space 114 inside to accommodate the connecting seat 1223 and the roller 1224. After the pulley module 122 is placed into the accommodating space 114, the roller 1224 partially protrudes out of the accommodating space 114. The accommodating space 114 has a certain margin in the height and length directions so that the pulley module 122 can move in the accommodating space 114. That is, the pulley module 122 can move relative to the housing 110 in both the height direction and the width direction of the housing 110.

[0052] Furthermore, the housing 110 has openings at both ends along its length, which connect to the receiving space 114, allowing the assembler to insert the pulley module 122 into the receiving space 114 through the openings.

[0053] refer to Figure 11 In some embodiments, the two pulley assemblies 120 have a third inclined surface 123 at the other end of the housing 110 along its length, and the pulley device body 100 also includes a third pressing member 140, which abuts against the two third inclined surfaces 123.

[0054] This design adds a third inclined surface 123 and a third pressing member 140 to the other end of the pulley assembly 120. Both ends of the pulley assembly 120 are subjected to pressing force simultaneously, which can effectively prevent the pulley assembly 120 from warping and make the force on the pulley assembly 120 more balanced.

[0055] This invention also provides a window, such as Figures 1-4 As shown, the window includes the double-row pulley device 1000 illustrated in the above embodiments.

[0056] Furthermore, the window also includes a window frame and a window body. The swing member 200 is connected to the bottom of the window body or integrally formed on the bottom of the window body. The pulley assembly 120 is slidably disposed on the slide rail at the bottom of the window frame so that the window body can be slidably disposed on the window frame.

[0057] The specific connection method and integral molding method of the window body and the swing component 200 can be referred to the specific embodiment of the double-row pulley device 1000 mentioned above, and will not be repeated here.

[0058] This invention also provides a gate, such as Figures 1-4 As shown, the door includes the double-row pulley device 1000 illustrated in the above embodiments.

[0059] Furthermore, the door also includes a door frame and a door body. The swing member 200 is connected to the bottom of the door body or integrally formed on the bottom of the door body. The pulley assembly 120 is slidably disposed on the slide rail at the bottom of the door frame, so that the door body can be slidably disposed on the door frame.

[0060] The specific connection method and integral molding method of the door body and the swing component 200 can be referred to the specific embodiment of the double-row pulley device 1000 mentioned above, and will not be repeated here.

[0061] It should be understood that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Those skilled in the art can modify the technical solutions described in the above embodiments, or make equivalent substitutions for some of the technical features; and all such modifications and substitutions should fall within the protection scope of the appended claims of the present invention.

[0062] It should be understood that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Those skilled in the art can modify the technical solutions described in the above embodiments, or make equivalent substitutions for some of the technical features; and all such modifications and substitutions should fall within the protection scope of the appended claims of the present invention.

Claims

1. A double-row pulley device, characterized in that, The device includes a pulley device body and a swinging component. The pulley device body includes a housing and two pulley assemblies disposed on the housing. The two pulley assemblies are arranged in the width direction of the housing. The swinging component is oscillatingly disposed on the housing, and the swinging axis of the swinging component is disposed along the length direction of the housing. In the width direction of the housing, the swinging axis is located between the two pulley assemblies. The swinging component is used to connect with or integrally form with a window body or a door body.

2. The double-row pulley device according to claim 1, characterized in that, The swing member has one of a protrusion structure and a groove structure, and the housing has the other of a protrusion structure and a groove structure. The protrusion structure is used to cooperate with the groove structure so that the swing member can be swingably disposed on the housing. A limiting surface is provided next to one of the protrusion structure and the groove structure, and a shoulder is provided next to the other of the protrusion structure and the groove structure. There is a swing amplitude gap between the limiting surface and the shoulder. The limiting surface is used to cooperate with the shoulder to limit the maximum swing amplitude of the swing member.

3. The double-row pulley device according to claim 2, characterized in that, The protruding structure is an arc-shaped swing block, and the groove structure is an arc-shaped groove.

4. The double-row pulley device according to claim 3, characterized in that, The arc-shaped groove is a tapered arc-shaped groove to prevent the arc-shaped swing block from disengaging from the opening of the arc-shaped groove.

5. The double-row pulley device according to claim 2, characterized in that, The length of the groove structure is greater than the length of the protrusion structure.

6. The double-row pulley device according to claim 2, characterized in that, The length of the groove structure is not less than the length of the protrusion structure, and the ratio of the length of the protrusion structure to the length of the shell is greater than or equal to 4:

5.

7. The double-row pulley device according to claim 2, characterized in that, The protruding structure is a triangular pendulum block, and the groove structure is a triangular groove.

8. The double-row pulley device according to any one of claims 2-6, characterized in that, The swinging component also includes a connecting block, the protruding structure is connected to the bottom of the connecting block in the central region of the width direction of the housing, and the limiting surface is disposed at the bottom of the connecting block; the top side of the housing is provided with a protrusion, and the groove structure and the shoulder are disposed on the protrusion.

9. A window, characterized in that, include: The double-row pulley device shown in any one of claims 1-8 above.

10. A door, characterized in that, include: The double-row pulley device shown in any one of claims 1-8 above.

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