CN221060348U - Rail device and curtain device - Google Patents

Abstract

The utility model is suitable for the field of electric curtains and discloses a track device and a curtain device. The first track assembly is in sliding fit with the second track assembly, the driving wheel assembly is arranged on the first track assembly, the driven wheel assembly is arranged on the second track assembly, the movable pulley assembly is arranged on the second track assembly and is in sliding connection with the second track assembly, the fixed pulley assembly is arranged on the second track assembly and is respectively connected with the first track assembly and the movable pulley assembly, and the driving wheel assembly, the driven wheel assembly and the movable pulley assembly are wound on the driving belt. In the utility model, the track device is convenient to install and adjust, and is compatible with the storage of the transmission belt when the track device is lengthened or shortened; when the synchronous belt is installed, the synchronous belt does not need to be cut, so that waste of waste materials is reduced; the track device is small in width and size, an additional driving belt storage box is not needed, and the structure is smooth.

Description

Rail device and curtain device

Technical Field

The utility model relates to the field of electric curtains, in particular to a track device and a curtain device.

Background

In the conventional electric curtain rail, a synchronous belt for driving is usually in a form of a single line with a round runway. The length and shape of this form are fixed at the time of production or after installation and cannot be adjusted any more. In the telescopic track, when the length of the track is changed, the length of the synchronous belt is also changed, and specific structural treatment is required for the change of the synchronous belt, so that the technical scheme commonly used at present is as follows:

In the scheme 1, the synchronous belt is designed into a tailorable material, and redundant parts are directly cut off after the synchronous belt is fixed. In addition, the synchronous belt has the cutting property, so that the selection and the manufacturing process of materials are limited;

In the scheme 2, on the premise of not cutting the synchronous belt, the length of the track is adjusted, and an redundant synchronous belt accommodating structure, such as a fishing reel, needs to be designed in the curtain track structure to wind the synchronous belt. Because hold-in range is glued thick and product width is limited, will satisfy longer flexible adjustment scope generally, needs great accommodation space, and product storage part needs the protrusion, influences the outward appearance. Under the condition that the containing structure is not protruded, the telescopic adjusting range is generally smaller due to space limitation.

Disclosure of utility model

An object of the present utility model is to provide a track device, which aims to solve the technical problem that the length of the track device is difficult to adjust.

In order to achieve the above purpose, the utility model provides a scheme that: a track set comprising:

A first track assembly;

A second track assembly in sliding engagement with the first track assembly;

the driving wheel assembly is arranged on the first track assembly;

the driven wheel assembly is arranged on the second track assembly;

The movable pulley assembly is arranged on the second track assembly and is in sliding connection with the second track assembly;

The fixed pulley assembly is arranged on the second track assembly and is respectively connected with the first track assembly and the movable pulley assembly;

The driving wheel assembly, the driven wheel assembly and the movable pulley assembly are wound by the driving belt;

The fixed pulley assembly is used for pulling the movable pulley assembly in a direction away from the driven pulley assembly, so that the transmission belt is in a tight state.

As one implementation mode, the number of the driven wheel assemblies is at least two, the driving wheel assemblies, the at least two driven wheel assemblies and the movable pulley assemblies are wound on the driving belt, the driving belt is alternately connected with the driven wheel assemblies and the movable pulley assemblies, and the driving belt, the movable pulley assemblies and the at least two driven wheel assemblies form a wave-shaped structure.

As an implementation mode, the fixed pulley assembly comprises a fixed pulley and a traction rope, the fixed pulley is rotationally connected with the second track assembly, one end of the traction rope is connected with the first track assembly, the other end of the traction rope is connected with the movable pulley assembly, and the traction rope winds the fixed pulley.

As an implementation mode, both ends of the haulage rope are provided with block structures, the first track assembly is provided with a first limit groove, the movable pulley assembly is provided with a second limit groove, and the block structures are respectively inserted into the first limit groove and the second limit groove, so that the haulage rope is respectively detachably connected with the first track assembly and the movable pulley assembly.

As an implementation mode, the movable pulley assembly comprises a sliding structure and a first bearing, the sliding structure is in sliding connection with the second track assembly, the fixed pulley assembly is connected with the sliding structure, the first bearing is in rotary connection with the sliding structure, and the transmission belt winds around the first bearing.

As an embodiment, the second rail assembly is provided with a chute, and the sliding structure is in sliding fit with the chute.

As an embodiment, the movable pulley assembly further comprises a fastener for connecting the sliding structure with the second rail assembly.

As an implementation mode, the sliding structure comprises a sliding part, a first protruding part and a second protruding part, wherein the first protruding part and the second protruding part are arranged on the sliding part at intervals, the sliding part is in sliding connection with the second track assembly, the fixed pulley assembly is connected with the first protruding part, the first bearing is in rotating connection with the second protruding part, and the transmission belt penetrates through the gap between the first protruding part and the second protruding part.

As an embodiment, the movable pulley assembly further includes a cap connected to the first protrusion and the second protrusion, respectively, and the cap covers a gap between the first protrusion and the second protrusion to limit the belt.

As an embodiment, the driven wheel assembly comprises a second bearing and a toothed belt wheel, the second bearing is connected with the second track assembly, the toothed belt wheel is connected with the second bearing, a plurality of toothed grooves are arranged on the transmission belt, and the toothed belt wheel is meshed with the toothed grooves.

As an embodiment, the driven wheel assembly further comprises a rotating shaft, a mounting groove is formed in the second track assembly, one end of the rotating shaft is inserted into the mounting groove, and the other end of the rotating shaft is connected with the second bearing.

As one embodiment, the track device comprises an auxiliary component which abuts against the driving belt so as to limit the outward protrusion of the driving belt;

The auxiliary assembly comprises a fixed shaft and a shaft sleeve, the fixed shaft is arranged on the second track assembly, the shaft sleeve is rotationally connected with the fixed shaft, and the shaft sleeve abuts against the transmission belt.

A second object of the present utility model is to provide a window covering apparatus, comprising the track apparatus described above.

The track device comprises a first track assembly, a second track assembly, a driving wheel assembly, a driven wheel assembly, a movable pulley assembly, a fixed pulley assembly and a transmission belt. The first track assembly is in sliding fit with the second track assembly, the driving wheel assembly is arranged on the first track assembly, the driven wheel assembly is arranged on the second track assembly, the movable pulley assembly is arranged on the second track assembly and is in sliding connection with the second track assembly, the fixed pulley assembly is arranged on the second track assembly and is respectively connected with the first track assembly and the movable pulley assembly, and the driving wheel assembly, the driven wheel assembly and the movable pulley assembly are wound on the driving belt.

When the first track assembly and the second track assembly slide relatively to extend or retract the track device, the transmission belt correspondingly extends or contracts together, after the length of the track device is adjusted, the fixed pulley assembly moves in a direction away from the driven pulley assembly and drives the movable pulley assembly and the transmission belt together, and the movable pulley assembly enables the transmission belt to be in a tight state, so that the length adjustment of the track device is completed.

Therefore, compared with the prior art, the technical scheme has at least the following technical effects: 1, when in installation, a synchronous belt does not need to be cut, so that waste of waste materials is reduced; 2. the installation and adjustment are convenient, and the storage compatibility of the transmission belt is realized when the track device is lengthened or shortened; 3. the rail device has small width and size and flat structure.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a front view of a track set provided by an embodiment of the present utility model;

FIG. 2 is a top view of a track set provided by an embodiment of the present utility model;

FIG. 3 is a cross-sectional view taken along line III-III of FIG. 1;

FIG. 4 is a partial enlarged view at B in FIG. 3;

FIG. 5 is a schematic perspective view of a driven wheel assembly according to an embodiment of the present utility model;

FIG. 6 is an enlarged view of a portion of FIG. 3 at A;

FIG. 7 is a cross-sectional view taken along the direction IV-IV in FIG. 2;

FIG. 8 is an enlarged view of a portion of FIG. 7 at C;

fig. 9 is an exploded perspective view of the traveling block assembly.

Reference numerals illustrate: 10. a first track assembly; 101. a first limit groove; 20. a second track assembly; 201. a chute; 203. a mounting groove; 30. a drive wheel assembly; 40. a driven wheel assembly; 401. a first driven wheel; 402. a second driven wheel; 41. a second bearing; 43. toothed belt wheel; 45. a rotating shaft; 50. a movable pulley assembly; 501. the second limit groove; 51. a sliding structure; 52. a first bearing; 53. a fastener; 54. capping; 511. a slide part; 512. a first projection; 513. a second projection; 60. a fixed pulley assembly; 61. a fixed pulley; 62. a traction rope; 621. a block structure; 70. a transmission belt; 80. an auxiliary component; 81. a fixed shaft; 82. a shaft sleeve.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present utility model are merely used to explain the relative positional relationship between the components, the movement condition, etc. in a specific posture, and if the specific posture is changed, the directional indicators are correspondingly changed.

It will also be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or be indirectly connected to the other element through intervening elements.

Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

Referring to fig. 1 to 9, the track device provided by the utility model is shown.

The track device comprises a first track assembly 10, a second track assembly 20, a driving wheel assembly 30, a driven wheel assembly 40, a movable pulley assembly 50, a fixed pulley assembly 60 and a transmission belt 70; the second rail assembly 20 is in sliding fit with the first rail assembly 10, the driving wheel assembly 30 is arranged on the first rail assembly 10, and the driven wheel assembly 40 is arranged on the second rail assembly 20; the movable pulley assembly 50 is arranged on the second track assembly 20 and is in sliding connection with the second track assembly 20, and the fixed pulley assembly 60 is arranged on the second track assembly 20 and is respectively connected with the first track assembly 10 and the movable pulley assembly 50; the driving belt 70 is wound around the driving wheel assembly 30, the driven wheel assembly 40 and the movable pulley assembly 50, wherein the fixed pulley assembly 60 is used for pulling the movable pulley assembly 50 away from the driven wheel assembly 40 so as to keep the driving belt 70 in a tight state.

The first rail assembly 10 is in sliding fit with the second rail assembly 20, and the second rail assembly 20 is sleeved outside the first rail assembly 10. The first track assembly 10 includes a first track and the second track assembly 20 includes a second track. The purpose of adjusting the length of the track device is achieved by adjusting the relative positions of the first track assembly 10 and the second track assembly 20 so as to be suitable for various scenes;

The length of the transmission belt 70 wound between the driving wheel assembly 30 and the driven wheel assembly 40 is adjusted by adjusting the relative positions of the movable pulley assembly 50 and the driven wheel assembly 40, and the redundant transmission belt 70 is stored; the fixed pulley assembly 60 is used for pulling the movable pulley assembly 50 away from the driven pulley assembly 40, and the first pulling force F1 of the fixed pulley assembly 60 pulling the movable pulley assembly 50 is balanced with the second pulling force F2 of the driving belt 70 pulling around the movable pulley assembly 50, so that the driving belt 70 is in a tight state. That is, the transmission belt 70 can be adapted to rail devices with different lengths and is always in a tight state, and the redundant transmission belt 70 is accommodated by adjusting the relative position of the movable pulley assembly 50, and the accommodation space occupied by the transmission belt 70 is smaller.

As an embodiment, the number of driven wheel assemblies 40 is at least two, the driving wheel assembly 30, at least two driven wheel assemblies 40 and the movable pulley assembly 50 are wound by the driving belt 70, the driving belt 70 is alternately connected with the driven wheel assemblies 40 and the movable pulley assemblies 50, and the driving belt 70, the movable pulley assemblies 50 and the at least two driven wheel assemblies 40 form a wave structure.

Referring to fig. 4, in the present embodiment, the driven wheel assembly 40 includes a first driven wheel 401 and a second driven wheel 402, the belt 70 sequentially winds around the driving wheel assembly 30, the first driven wheel 401, the movable pulley assembly 50 and the second driven wheel 402, and finally winds back to the driving wheel assembly 30, so as to form a ring-shaped closure, and the belt 70 winds around in a wave-shaped structure.

The track device is lengthened, namely the relative positions of the driving wheel assembly 30 and the first driven wheel 401 and the second driven wheel 402 are lengthened, the relative positions of the movable pulley assembly 50 are adjusted, the movable pulley assembly 50 moves towards the first driven wheel 401 and the second driven wheel 402, the transmission belt 70 between the movable pulley assembly 50 and the first driven wheel 401 and the second driven wheel 402 is shortened, the transmission belt 70 between the driving wheel assembly 30 and the first driven wheel 401 and the second driven wheel 402 is lengthened, and the transmission belt 70 is matched with the lengthened track device; the track device becomes shorter, that is, the relative positions of the driving wheel assembly 30 and the first driven wheel 401 and the second driven wheel 402 become closer, the relative positions of the movable pulley assembly 50 are adjusted, the movable pulley assembly 50 moves towards the driving wheel assembly 30, the transmission belt 70 between the movable pulley assembly 50 and the first driven wheel 401 and the second driven wheel 402 is lengthened, the transmission belt 70 between the driving wheel assembly 30 and the first driven wheel 401 and the second driven wheel 402 is shortened, and the transmission belt 70 is matched with the shortened track device.

By adjusting the relative positions of the movable pulley assembly 50 and the first driven pulley 401 and the second driven pulley 402 to adjust the transmission belt 70, the redundant transmission belt 70 is stored and stretched, so that the transmission belt 70 is matched with track devices with various lengths. And the transmission belt 70 forms a wave-shaped structure, which has the advantage of occupying a small storage space.

In a specific application, for example, the driven wheel assembly further includes a third driven wheel, even a fourth driven wheel or more driven wheels, the conveyor belt 70 sequentially winds around the driving wheel assembly 30, the first driven wheel 401, the movable pulley assembly 50, the second driven wheel 402, the third driven wheel, the fourth driven wheel … … and finally winds back to the driving wheel assembly 30, so as to form an annular closed state, and the conveyor belt 70 winds around in a wave-shaped structure. The length of the transmission belt 70 is more flexible through the multiple driven wheel assemblies, multiple contact points are arranged between the multiple driven wheel assemblies and the transmission belt 70, transmission force can be shared, friction loss is reduced, load is shared, the bearing capacity of the system is improved, and therefore transmission efficiency is improved, and abrasion and fatigue risks are reduced.

As an embodiment, the fixed pulley assembly 60 includes a fixed pulley 61 and a traction rope 62, the fixed pulley 61 is rotatably connected to the second rail assembly 20, one end of the traction rope 62 is connected to the first rail assembly 10, the other end of the traction rope 62 is connected to the movable pulley assembly 50, and the traction rope 62 is wound around the fixed pulley 61.

In this embodiment, the traction rope 62 has one end fixed to the first rail assembly 10 and the other end wound around the fixed pulley 61 and connected to the movable pulley assembly 50; the traction rope 62 pulls the movable pulley assembly 50 to provide a first pulling force F1 towards one side of the movable pulley assembly 50, which is directed to the fixed pulley assembly 60, and the first pulling force F1 is balanced with a second pulling force F2, which is pulled by the driving belt 70 around the movable pulley assembly 50, so that the driving belt 70 is always in a tight state.

As an embodiment, two ends of the traction rope 62 are provided with block structures 621, the first track assembly 10 is provided with a first limiting groove 101, the movable pulley assembly 50 is provided with a second limiting groove 501, and the block structures 621 are respectively inserted into the first limiting groove 101 and the second limiting groove 501, so that the traction rope 62 is detachably connected with the first track assembly 10 and the movable pulley assembly 50 respectively.

In this embodiment, the traction rope 62 is detachably mounted on the first rail assembly 10 and the movable pulley assembly 50 through the block structures 621 at both ends, so that the traction rope 62 can be conveniently assembled and quickly replaced after being damaged. The traction rope 62 pulls the first pulling force F1 of the movable pulley assembly 50, and the first pulling force F1 and the second pulling force F2 of the driving belt 70 pulled around the movable pulley assembly 50 are balanced, so that the driving belt 70 is always in a tight state.

As an embodiment, the movable pulley assembly 50 includes a sliding structure 51 and a first bearing 52, the sliding structure 51 is slidably connected with the second track assembly 20, the fixed pulley assembly 60 is connected with the sliding structure 51, the first bearing 52 is rotatably connected with the sliding structure 51, and the driving belt 70 is wound around the first bearing 52; the second track assembly 20 is provided with a chute 201, and the sliding structure 51 is in sliding engagement with the chute 201.

In this embodiment, the transmission belt 70 is wound around the first bearing 52, the sliding structure 51 is in sliding fit with the sliding groove 201 of the second track assembly 20, the relative position of the first bearing 52 and the driven wheel assembly 40 is adjusted by the sliding structure 51, and thus the length of the transmission belt 70 between the driving wheel assembly 30 and the driven wheel assembly 40 is adjusted, the redundant transmission belt 70 is accommodated, and the transmission belt 70 is adapted to track devices with various lengths.

The fixed pulley assembly 60 is connected with the sliding structure 51 through the traction rope 62, and the sliding structure 51 is pulled to provide a first pulling force F1 for the movable pulley assembly 50, and the first pulling force F1 and a second pulling force F2 pulled by the driving belt 70 on the first bearing 52 are balanced, so that the driving belt 70 is in a tight state.

As an embodiment, the movable sheave assembly 50 further includes a fastener 53, the fastener 53 being configured to attach to the second rail assembly 20 through the sliding structure 51.

In this embodiment, after the track device is adjusted in length, the movable pulley assembly 50 correspondingly adjusts the relative position with the driven pulley assembly 40, so as to adjust the length of the transmission belt 70 between the driving pulley assembly 30 and the driven pulley assembly 40; the fastener 53 is penetrated through the sliding structure 51 and connected with the second track assembly 20, so that the relative positions of the movable pulley assembly 50 and the driven wheel assembly 40 are fixed, and the movable pulley assembly 50 is prevented from sliding to move in the use process of the track device, and the use of the transmission belt 70 is prevented from being influenced; in a specific application, the traction rope 62 is inevitably broken in long-term use, after the traction rope 62 is broken, the movable pulley assembly 50 is fixed by the fastener 53, so that the movable pulley assembly 50 is still in a stress balance state under the condition of lacking the first tensile force F1, the movable pulley assembly 50 is still in a fixed position after the traction rope 62 is worn and broken in long-term use, the transmission belt 70 is in a tight state, and the rail device can still be normally used.

As an embodiment, the sliding structure 51 includes a sliding portion 511, a first protruding portion 512 and a second protruding portion 513, the first protruding portion and the second protruding portion 513 are disposed on the sliding portion 511 at intervals, the sliding portion 511 is slidably connected with the second track assembly 20, the fixed pulley assembly 60 is connected with the first protruding portion 512, the first bearing 52 is rotatably connected with the second protruding portion 513, and the driving belt 70 is inserted through a gap between the first protruding portion 512 and the second protruding portion 513.

In the present embodiment, the first protruding portion 512 is disposed at an end of the sliding portion 511 near the fixed pulley assembly 60, and the second protruding portion 513 is disposed at an end of the sliding portion 511 near the driven pulley assembly 40; the second limiting groove 501 is formed in the first protruding portion 512; a block structure 621 at one end of the traction rope 62 is disposed in the second limiting groove 501. The traction rope 62 applies a first tensile force F1 to the first protruding portion 512, and the first tensile force F1 is balanced with a second tensile force F2 at which the belt 70 is pulled around the second protruding portion 513, so that the belt 70 is in a tight state.

As an embodiment, the movable pulley assembly 50 further includes a cap 54, the cap 54 is connected to the first and second protrusions 512 and 513, respectively, and the cap 54 covers the gap between the first and second protrusions 512 and 513 to limit the driving belt 70.

In this embodiment, the cap 54 is fixed to the sliding portion 511 by the fastener 53 and covers the gap between the first protruding portion 512 and the second protruding portion 513, which plays a role in limiting the belt 70, and prevents the belt 70 from coming out of the first bearing 52 after use, resulting in slackening of the belt 70 and affecting use.

As an embodiment, the driven wheel assembly 40 includes a second bearing 41 and a toothed pulley 43, the second bearing 41 is connected with the second track assembly 20, the toothed pulley 43 is connected with the second bearing 41, a plurality of toothed grooves are arranged on the transmission belt 70, and the toothed pulley 43 is meshed with the toothed grooves;

The driven wheel assembly 40 further includes a rotation shaft 45, a mounting groove 203 is provided on the second rail assembly 20, one end of the rotation shaft 45 is inserted into the mounting groove 203, and the other end of the rotation shaft 45 is connected with the second bearing 41.

In this embodiment, the toothed pulley 43 is sleeved on the outer ring of the second bearing 41 and rotates around the rotation shaft 45, so that the service lives of the toothed pulley 43, the second bearing 41 and the rotation shaft 45 can be prolonged with less rotation friction. The mounting groove 203 is used for fixing the driven wheel assembly 40 in the second track assembly 20 without moving, so that the running stability of the transmission belt 70 is improved; the side of the transmission belt 70, which contacts with the toothed belt wheel 43, is provided with a plurality of toothed grooves, and the toothed belt wheel and the transmission belt 70 realize non-slip synchronous movement through the engagement of the toothed grooves.

As one embodiment, the track arrangement includes an auxiliary assembly 80 that abuts the belt 70 to limit outward bulging of the belt 70; the auxiliary assembly 80 includes a fixed shaft 81 and a sleeve 82, the fixed shaft 81 is disposed on the second track assembly 20, the sleeve 82 is rotatably connected with the fixed shaft 81, and the sleeve 82 abuts against the driving belt 70.

In the present embodiment, the auxiliary assembly 80 includes at least two fixing shafts 81 and at least two bushings 82, and the at least two fixing shafts 81 and the at least two bushings 82 are disposed at both sides of the driven wheel assembly 40, respectively, for limiting the transmission belt 70 at both sides of the driven wheel assembly 40 to protrude outward. The shaft sleeve 82 abuts against the driving belt 70, so that the gap between the driven wheel assembly 40 and the second track assembly 20 is prevented from shaking when the driving belt 70 moves, the driving belt 70 is prevented from touching and wearing other structural parts, and the abrasion of the driving belt 70 is reduced.

The present embodiment also provides a window covering apparatus including a track apparatus. The driving belt 70 is provided with curtain hanging lugs which synchronously move along with the driving belt 70 and are used for installing curtains and realizing curtain opening and closing along with the movement of the driving belt 70.

The first track assembly 10 and the second track assembly 20 are in sliding fit, and the length of the track device is adjusted by adjusting the relative positions of the first track assembly 10 and the second track assembly 20, so that the track device is suitable for various scenes; by adjusting the relative positions of the movable pulley assembly 50 and the driven pulley assembly 40 to adjust the belt 70, the redundant belt 70 is received and tensioned, so that the belt 70 is adapted to track arrangements of various lengths.

The driving wheel assembly 30 is driven by a motor, the transmission belt 70 slides under the cooperation of the driving assembly 30, the driven wheel assembly 40 and the movable pulley assembly 50, and drives the curtain suspension lugs to move, so that the curtain is opened and closed.

The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the description of the present utility model and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the utility model.

Claims (13)

1. A track set, comprising:

A first track assembly;

A second track assembly in sliding engagement with the first track assembly;

the driving wheel assembly is arranged on the first track assembly;

the driven wheel assembly is arranged on the second track assembly;

The movable pulley assembly is arranged on the second track assembly and is in sliding connection with the second track assembly;

The fixed pulley assembly is arranged on the second track assembly and is respectively connected with the first track assembly and the movable pulley assembly;

The driving wheel assembly, the driven wheel assembly and the movable pulley assembly are wound by the driving belt;

The fixed pulley assembly is used for pulling the movable pulley assembly in a direction away from the driven pulley assembly, so that the transmission belt is in a tight state.

2. The track set as claimed in claim 1, wherein,

The number of the driven wheel assemblies is at least two, the driving wheel assemblies, the at least two driven wheel assemblies and the movable pulley assemblies are wound on the driving belt, the driving belt is alternately connected with the driven wheel assemblies and the movable pulley assemblies, and the driving belt, the movable pulley assemblies and the at least two driven wheel assemblies form a wave-shaped structure.

3. The track set of claim 1 wherein said fixed pulley assembly includes a fixed pulley and a pull rope, said fixed pulley and said second track assembly being rotatably connected, one end of said pull rope being connected to said first track assembly, the other end of said pull rope being connected to said movable pulley assembly, said pull rope being wound around said fixed pulley.

4. A track set as claimed in claim 3, wherein block structures are provided at both ends of the traction rope, the first track assembly is provided with a first limit groove, the movable pulley assembly is provided with a second limit groove, and the block structures are respectively inserted into the first limit groove and the second limit groove, so that the traction rope is detachably connected with the first track assembly and the movable pulley assembly, respectively.

5. The track set of claim 1 wherein said traveling block assembly includes a sliding structure and a first bearing, said sliding structure being slidably coupled to said second track assembly, said fixed block assembly being coupled to said sliding structure, said first bearing being rotatably coupled to said sliding structure, said belt being wound around said first bearing.

6. The track set of claim 5 wherein said second track assembly is provided with a chute and said slide structure is in sliding engagement with said chute.

7. The track set of claim 5 wherein the traveling block assembly further comprises a fastener for threading the sliding structure in connection with the second track assembly.

8. The track set of claim 5 wherein said sliding structure includes a slide, a first projection and a second projection, said first projection and said second projection being spaced apart on said slide, said slide being slidably coupled to said second track assembly, said fixed sheave assembly being coupled to said first projection, said first bearing being rotatably coupled to said second projection, said belt passing through the gap between said first projection and said second projection.

9. The track set of claim 8 wherein the traveling block assembly further includes a cap coupled to the first and second projections, respectively, the cap covering the gap of the first and second projections to limit the drive belt.

10. The track set as in claim 1, wherein the driven wheel assembly includes a second bearing and a toothed pulley, the second bearing being coupled to the second track assembly, the toothed pulley being coupled to the second bearing, the drive belt being provided with a plurality of toothed grooves, the toothed pulley being engaged with the toothed grooves.

11. The track set as in claim 10, wherein the driven wheel assembly further comprises a rotating shaft, wherein the second track assembly is provided with a mounting groove, wherein one end of the rotating shaft is inserted into the mounting groove, and wherein the other end of the rotating shaft is connected to the second bearing.

12. The track set of claim 1 including an auxiliary assembly to bear against the belt to limit outward bulging of the belt;

The auxiliary assembly comprises a fixed shaft and a shaft sleeve, the fixed shaft is arranged on the second track assembly, the shaft sleeve is rotationally connected with the fixed shaft, and the shaft sleeve abuts against the transmission belt.

13. A window covering apparatus, comprising: a track set as claimed in any one of claims 1 to 12.