Opening and closing curtain double-track device and opening and closing curtain

Abstract

The utility model relates to an opening and closing curtain double-track device and an opening and closing curtain, and the opening and closing curtain double-track device comprises a track assembly which is provided with an upper transmission cavity and a lower transmission cavity; the main transmission box assembly comprises a main box body, an upper transmission wheel and a lower transmission wheel, the upper transmission wheel and the lower transmission wheel are rotatably installed in the main box body, the upper transmission wheel corresponds to the upper transmission cavity, and the lower transmission wheel corresponds to the lower transmission cavity. The auxiliary transmission case assembly is provided with an upper belt pulley and a lower belt pulley. The upper belt assembly is connected with the upper transmission wheel and the upper belt wheel in a tensioning mode. The lower belt assembly is connected with the lower transmission wheel and the lower belt wheel in a tensioning mode, and the main transmission box assembly drives the upper belt assembly and the lower belt assembly to independently open and close. The upper transmission cavity and the lower transmission cavity are arranged in the height direction of the rail assembly so that the upper belt assembly and the lower belt assembly can be installed in an up-down partitioned mode, and the installation space of the rail assembly in the width direction is small.

Description

Technical Field

[0001] The utility model relates to the technical field of shading, in particular to an opening and closing curtain, and more particularly to an opening and closing curtain double-track device and the opening and closing curtain. Background Art

[0002] The opening and closing curtain includes a power device and a track device, and a belt assembly is arranged in the track device to control the opening and closing of the curtain, wherein the opening and closing of the curtain is synchronous or unilateral, and it is difficult to adjust the opening and closing of the curtain in sections and steps. In order to solve the problem of opening and closing distribution adjustment, the prior art adopts a dual-track structure for separate control. For example, Chinese public document CN215304864U discloses a single motor controlling dual tracks intelligent curtain device.

[0003] However, the spatial layout of the double-track structure is horizontal parallel arrangement, which requires a large installation space and is not suitable for narrow space installation. Therefore, improvement is needed. Utility Model Content

[0004] In order to overcome the problems existing in the related art, the embodiment of the utility model provides a double-track device for opening and closing curtains and an opening and closing curtain.

[0005] According to a first aspect of an embodiment of the utility model, a double-track device for opening and closing curtains is provided, comprising:

[0006] The track assembly is provided with an upper transmission cavity and a lower transmission cavity;

[0007] A main transmission box assembly installed at one end of the track assembly, the main transmission box assembly comprising a main box body, an upper transmission wheel and a lower transmission wheel rotatably installed in the main box body, the upper transmission wheel corresponds to the upper transmission cavity, and the lower transmission wheel corresponds to the lower transmission cavity;

[0008] A secondary transmission box assembly installed at the other end of the track assembly, wherein the secondary transmission box assembly is provided with an upper pulley and a lower pulley;

[0009] An upper belt assembly is arranged in the upper transmission cavity, and the upper belt assembly is tensionedly connected to the upper transmission wheel and the upper belt wheel;

[0010] A lower belt assembly is arranged in the lower transmission cavity, and the lower belt assembly is tensionedly connected to the lower transmission wheel and the lower belt pulley, and the main transmission box assembly drives the upper belt assembly and the lower belt assembly to open and close and move independently.

[0011] In one embodiment, the main box body is provided with an upper guide groove and a lower guide groove, the upper belt assembly is connected to the upper transmission wheel along the upper guide groove, the lower belt assembly is connected to the lower transmission wheel along the lower guide groove, and the upper transmission wheel and the lower transmission wheel have a height difference in the direction of the rotation axis.

[0012] In one embodiment, the upper transmission wheel and the lower transmission wheel are staggered in the length direction of the track assembly.

[0013] In one embodiment, the main transmission box assembly is provided with a locking mechanism, and the locking mechanism is plugged into the power device and locked by twisting.

[0014] In one embodiment, the main transmission box assembly includes an upper transmission shaft connected to the upper transmission wheel and a lower transmission shaft connected to the lower transmission wheel, the locking mechanism includes a locking frame rotatably connected to the lower transmission shaft or the upper transmission shaft, and the ends of the upper transmission shaft and the lower transmission shaft are both provided with transmission parts, the transmission parts are used to be plugged and connected to the power device, and the locking frame is used to lock the main transmission box assembly to the power device.

[0015] In one embodiment, the locking frame includes a rotating part, a locking protrusion protruding from the rotating part, and a lever connected to the rotating part, the locking protrusion protruding from the surface of the main case and rotating after being inserted into the power device, the locking protrusion forms an intersection with the hole wall of the power device, and the end of the lever protrudes from the side of the main case.

[0016] In one embodiment, the rotating part is provided with a limiting groove and limiting protrusions distributed in the limiting groove, and the main box body is provided with a positioning rib extending into the limiting groove, and the positioning rib is limited to a preset area of ​​the limiting groove after passing over the limiting protrusion.

[0017] In one embodiment, the upper belt assembly includes an upper transmission belt located in the upper transmission cavity and an upper suspension arm connected to the upper transmission belt, and the lower belt assembly includes a lower transmission belt located in the lower transmission cavity and a lower suspension arm connected to the lower transmission belt, and the upper suspension arm and the lower suspension arm extend beyond the lower surface of the track assembly.

[0018] In one embodiment, the auxiliary transmission box assembly includes an auxiliary box body and a partition frame installed on the auxiliary box body, the auxiliary box body is provided with a gear shaft, the upper pulley and the lower pulley are rotatably connected to the gear shaft, and the partition frame separates the upper pulley and the lower pulley.

[0019] According to a second aspect of an embodiment of the utility model, there is provided an opening and closing curtain, comprising a power device, the opening and closing curtain also comprising the opening and closing curtain double track device as described above, the power device comprising a first power assembly and a second power assembly, the first power assembly being drivingly connected to an upper transmission wheel, the second power assembly being drivingly connected to a lower transmission wheel.

[0020] The technical solution provided by the embodiment of the utility model can include the following beneficial effects: the upper transmission cavity and the lower transmission cavity are arranged along the height direction of the track assembly to realize the upper belt assembly and the lower belt assembly to be installed in the upper and lower partitions, and the installation space in the width direction of the track assembly is small. The upper transmission wheel and the lower transmission wheel in the main transmission box assembly are arranged at intervals and staggered in the height direction, and the main transmission box assembly drives the upper belt assembly and the lower belt assembly to open and close independently, and the opening and closing control of the opening and closing curtain is convenient.

[0021] It should be understood that the above general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings herein are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present utility model, and together with the description, are used to explain the principles of the present utility model.

[0023] Figure 1 It is a schematic structural diagram of an opening and closing curtain according to an exemplary embodiment.

[0024] Figure 2 It is a schematic structural diagram of a main transmission box assembly according to an exemplary embodiment.

[0025] Figure 3 The figure is a schematic diagram of an exploded structure of a main transmission case assembly according to an exemplary embodiment.

[0026] Figure 4 It is a schematic cross-sectional structural diagram of a main transmission box assembly according to an exemplary embodiment.

[0027] Figure 5 is a schematic cross-sectional structure diagram of a track assembly according to an exemplary embodiment.

[0028] Figure 6 It is a schematic cross-sectional structural diagram of an auxiliary transmission case assembly according to an exemplary embodiment.

[0029] Figure 7 It is a schematic diagram of the exploded structure of an auxiliary transmission case assembly according to an exemplary embodiment.

[0030] In the figure, the track assembly 10; the upper transmission cavity 11; the lower transmission cavity 12; the main transmission box assembly 20; the main box body 21; the upper guide groove 211; the lower guide groove 212; the hook groove 213; the upper transmission wheel 22; the lower transmission wheel 23; the upper transmission shaft 24; the transmission part 241; the lower transmission shaft 25; the locking frame 26; the rotating part 261; the locking convex plate 262; the lever 263; the limiting groove 264; the limiting convex point 265; the movable hook 27; the guide frame 28; the middle dividing plate 281; the upper guide part 282; the inner convex plate 2821; the outer convex plate 2822; the lower guide part 283; the auxiliary transmission box assembly 30; the auxiliary box body 31; the gear shaft 311; the partition frame 32; the upper pulley 33; the lower pulley 34; the upper belt assembly 40; the upper transmission belt 41; the lower belt assembly 50; the lower transmission belt 51; the lower boom 52; the power device 60. DETAILED DESCRIPTION

[0031] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on this patent; in order to better illustrate the embodiments of the utility model, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0032] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0033] In the description of the present invention, unless otherwise clearly specified and limited, if the term "connection" or the like appears to indicate the connection relationship between components, the term should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two components or the interaction relationship between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] like Figures 1 to 5As shown, the utility model provides a double track device for opening and closing curtains, which includes a track assembly 10, an upper belt assembly 40, a lower belt assembly 50, a main transmission box assembly 20 and a secondary transmission box assembly 30 respectively installed at both ends of the track assembly 10. The main transmission box assembly 20 is used to connect a power device 60, and the opening and closing curtain includes the power device 60, which includes a first power assembly and a second power assembly, and the first power assembly and the second power assembly respectively perform independent power output.

[0035] The track assembly 10 is provided with an upper transmission cavity 11 and a lower transmission cavity 12, and the upper transmission cavity 11 and the lower transmission cavity 12 are arranged along the height direction of the track assembly 10. The main transmission box assembly 20 includes a main box body 21, an upper transmission wheel 22 and a lower transmission wheel 23 rotatably mounted in the main box body 21, the upper transmission wheel 22 corresponds to the upper transmission cavity 11, and the lower transmission wheel 23 corresponds to the lower transmission cavity 12. The auxiliary transmission box assembly 30 is provided with an upper pulley 33 and a lower pulley 34, the upper pulley 33 corresponds to the upper transmission cavity 11, and the lower pulley 34 corresponds to the lower transmission cavity 12.

[0036] The upper belt assembly 40 is arranged in the upper transmission cavity 11, and the upper belt assembly 40 is tensionedly connected to the upper transmission wheel 22 and the upper belt pulley 33. The lower belt assembly 50 is arranged in the lower transmission cavity 12, and the lower belt assembly 50 is tensionedly connected to the lower transmission wheel 23 and the lower belt pulley 34. The first power assembly is drivingly connected to the upper transmission wheel 22, the second power assembly is drivingly connected to the lower transmission wheel 23, and the main transmission box assembly 20 drives the upper belt assembly 40 and the lower belt assembly 50 to open and close independently.

[0037] The track assembly 10 realizes the installation of the upper belt assembly 40 and the lower belt assembly 50 in the upper and lower partitions, and the installation space in the width direction of the track assembly 10 is small. The upper transmission wheel 22 and the lower transmission wheel 23 in the main transmission box assembly 20 are arranged at intervals and staggered in the height direction. The main transmission box assembly 20 drives the upper belt assembly 40 and the lower belt assembly 50 to open and close independently, and the opening and closing control of the opening and closing curtain is convenient.

[0038] In one embodiment, the upper transmission wheel 22 and the lower transmission wheel 23 have a height difference in the direction of the rotation axis, so that they can be misaligned in the height direction and drive the curtain to move from different heights.

[0039] like Figures 3 to 5As shown, the main housing 21 is a shell structure, and the main housing 21 is detachably connected to the end of the track assembly 10 by fasteners. The main housing 21 is provided with an upper guide groove 211 and a lower guide groove 212. The upper guide groove 211 is communicated with the upper transmission cavity 11, and the lower guide groove 212 is communicated with the lower transmission cavity 12. The upper belt assembly 40 is connected to the upper transmission wheel 22 along the upper guide groove 211, and the lower belt assembly 50 is connected to the lower transmission wheel 23 along the lower guide groove 212. The upper guide groove 211 is used to limit the range of movement of the upper belt assembly 40, and to guide and adjust the movement direction of the upper belt assembly 40. Based on the same principle, the lower guide groove 212 is used to limit the range of movement of the lower belt assembly 50.

[0040] Optionally, the main housing 21 is partially plate-shaped protruded to form a guide groove structure, and the upper guide groove 211 and the lower guide groove 212 are distributed on both sides of the main housing 21. In one embodiment, the main transmission housing assembly 20 includes a guide frame 28 installed on the main housing 21, the guide frame 28 includes a middle dividing plate 281, an upper guide portion 282 and a lower guide portion 283 protruding from both sides of the middle dividing plate 281, the upper guide portion 282 is formed by an outer convex plate 2822 and an inner convex plate 2821 protruding at intervals, and the upper guide groove 211 is the space between the outer convex plate 2822 and the inner convex plate 2821. Preferably, the width of the inner convex plate 2821 gradually increases from the upper transmission wheel 22 to the track assembly 10, the outer convex plate 2822 has an arc-shaped end face, and the two sides are parallel plate-shaped structures, and the space of the upper guide groove 211 gradually decreases from the upper transmission wheel 22 to the track assembly 10 to limit the range of motion of the upper belt assembly 40. Based on the same principle, the lower guide groove 212 is disposed opposite to the middle dividing plate 281 and is separated by a raised plate-like structure, which can be understood by referring to the structure and composition of the upper guide groove 211 .

[0041] Optionally, the upper transmission wheel 22 and the lower transmission wheel 23 are coaxially arranged, such as the upper transmission wheel 22 and the lower transmission wheel 23 are respectively installed on two concentric shafts that are interlaced and connected to form a coaxial arrangement and can be driven independently. In one embodiment, the upper transmission wheel 22 and the lower transmission wheel 23 are staggered in the length direction of the track assembly 10, so as to construct a partitioned drive layout with a gradient. Optionally, the distance between the rotation centerline of the upper transmission wheel 22 and the track assembly 10 is greater than the distance between the rotation centerline of the lower transmission wheel 23 and the track assembly 10, so as to form a parallel distribution structure.

[0042] In one embodiment, the main transmission case assembly 20 is provided with a locking mechanism, which is plugged into the power device 60 and locked by twisting. The locking mechanism is used to lock the main transmission case assembly 20 to the power device 60, so that the main transmission case assembly 20 and the power device 60 can be quickly disassembled and fixed, and the connection is convenient.

[0043] In one embodiment, the main transmission case assembly 20 includes an upper transmission shaft 24 connected to the upper transmission wheel 22 and a lower transmission shaft 25 connected to the lower transmission wheel 23, the locking mechanism includes a locking frame 26 rotatably connected to the upper transmission shaft 24 or the lower transmission shaft 25, and the ends of the upper transmission shaft 24 and the lower transmission shaft 25 are both provided with a transmission part 241. The upper transmission shaft 24 and the lower transmission shaft 25 are arranged in parallel, and after the main transmission case assembly 20 is assembled to the power device 60, the transmission part 241 is correspondingly plugged and connected to the power device 60, so that the transmission part 241 and the power device 60 are drivingly connected, wherein the transmission part 241 can be set as a spline groove or a spline shaft, and the power device 60 is provided with a transmission structure matched with the transmission part 241 to transmit power. Preferably, the main transmission case assembly 20 is provided with an upper boss, and the upper boss is plugged into the upper transmission shaft 24 to form a coaxial rotation arrangement. Furthermore, the guide frame 28 is provided with a lower boss, which is plugged into the lower transmission shaft 25 to form a coaxial rotation arrangement. The upper boss and the lower boss are arranged in parallel to improve assembly accuracy.

[0044] Preferably, the locking frame 26 includes a rotating portion 261, a locking convex plate 262 protruding from the rotating portion 261, and a lever 263 connected to the rotating portion 261. The rotating portion 261 and the main housing 21 are rotatably connected, and the locking convex plate 262 exceeds the surface of the main housing 21 and is inclined relative to the rotating portion 261. The locking convex plate 262 rotates after being inserted into the power device 60, and the locking convex plate 262 and the hole wall of the power device 60 form an intersection, so that the locking convex plate 262 is screwed and locked to the power device 60. The end of the lever 263 extends out of the side of the main housing 21 to facilitate the user to turn and rotate, thereby improving the convenience of disassembly and assembly of the locking frame 26 and the power device 60.

[0045] The locking frame 26 needs to be locked after rotating into position to avoid loosening. Preferably, the rotating part 261 is provided with a limiting groove 264 and a limiting convex point 265 distributed in the limiting groove 264, and the main box body 21 is provided with a positioning convex rib extending into the limiting groove 264, and the positioning convex rib is limited to the preset area of ​​the limiting groove 264 after passing over the limiting convex point 265. The limiting groove 264 is an arc-shaped groove structure, which can limit the range of motion of the locking frame 26. The limiting convex point 265 is located in the limiting groove 264, and forms a locking position with the groove wall of the limiting groove 264. The main box body 21 is a thin-walled structural member, and the positioning convex rib is distributed on the thin wall of the main box body 21 and penetrates into the limiting groove 264. After the locking frame 26 rotates, the limiting convex point 265 can squeeze the positioning convex rib, and the wall body connected to the positioning convex rib is elastically bent. The wall body is elastically reset after the positioning convex rib passes over the limiting convex point 265, thereby preventing the locking frame 26 from reversing and loosening.

[0046] In one embodiment, the main housing 21 is provided with at least one hook groove 213, and the main transmission housing assembly 20 includes a movable hook 27 detachably connected to the hook groove 213. The hook groove 213 is distributed on the top of the main housing 21, and is used to hang and connect the movable hook 27, and the movable hook 27 can be used to connect the end hook of the curtain. Preferably, three hook grooves 213 are provided, and the three hook grooves 213 are respectively distributed on the three sides of the top of the main housing 21.

[0047] like Figure 1 , Figures 5 to 7 As shown, in one embodiment, the upper belt assembly 40 includes an upper transmission belt 41 located in the upper transmission cavity 11 and an upper suspension arm connected to the upper transmission belt 41, and the lower belt assembly 50 includes a lower transmission belt 51 located in the lower transmission cavity 12 and a lower suspension arm 52 connected to the lower transmission belt 51, and the upper suspension arm and the lower suspension arm 52 exceed the lower surface of the track assembly 10. The upper transmission belt 41 and the lower transmission belt 51 are belt structures, and a slide groove is provided at the lower part of the track assembly 10, and the upper suspension arm and the lower suspension arm 52 slide along the slide groove to drive the curtain to move. Preferably, the bottom height positions of the upper suspension arm and the lower suspension arm 52 are equal, so that the height positions of the hanging curtains are consistent.

[0048] The auxiliary transmission box assembly 30 is connected to the end of the track assembly 10 and provides support for the upper transmission belt 41 and the lower transmission belt 51. The auxiliary transmission box assembly 30 includes an auxiliary box body 31 and a partition frame 32 installed on the auxiliary box body 31, the auxiliary box body 31 is provided with a gear shaft 311, the upper pulley 33 and the lower pulley 34 are rotatably connected to the gear shaft 311, and the partition frame 32 separates the upper pulley 33 and the lower pulley 34. The gear shaft 311 is formed on the partition frame 32 to form an integral structure. The upper pulley 33 and the lower pulley 34 are rotatably installed on the partition frame 32 to form a coaxial rotation structure with high installation stability. The auxiliary box body 31 is sleeved on the track assembly 10 and locked to the track assembly 10 by fasteners to form a detachable connection structure. Preferably, the auxiliary box body 31 is provided with a protruding end hook for connecting another curtain.

[0049] like Figure 1 and Figure 4As shown, the double track device for opening and closing curtains disclosed in the above embodiment is applied to the opening and closing curtains, and the opening and closing curtains include a power device 60, and the power device 60 includes a first power assembly and a second power assembly, the first power assembly is drivingly connected to the upper transmission wheel 22, and the second power assembly is drivingly connected to the lower transmission wheel 23. The first power assembly and the second power assembly output power independently, wherein the first power assembly can drive the upper belt assembly 40 to move, and the corresponding curtain connected to the upper belt assembly 40 can move back and forth. The second power assembly can drive the lower belt assembly 50 to move, and the corresponding curtain connected to the lower belt assembly 50 can move back and forth. The curtains can realize independent opening and closing control, and the upper belt assembly 40 and the lower belt assembly 50 in the track assembly 10 are arranged in a vertical interval in the height direction, and the internal space layout is reasonable, which can facilitate the installation of the opening and closing curtains in a narrow space.

[0050] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present invention, which follow the general principles of the present invention and include common knowledge or customary technical means in the art that are not disclosed in the present invention. The specification and examples are to be regarded as exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0051] It should be understood that the present invention is not limited to the precise structure described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A double-track device for opening and closing curtains, characterized in that: include: The track assembly (10) is provided with an upper transmission cavity (11) and a lower transmission cavity (12); a main transmission box assembly (20) mounted at one end of the track assembly (10), the main transmission box assembly (20) comprising a main box body (21), an upper transmission wheel (22) and a lower transmission wheel (23) rotatably mounted in the main box body (21), the upper transmission wheel (22) corresponding to the upper transmission cavity (11), and the lower transmission wheel (23) corresponding to the lower transmission cavity (12); A secondary transmission box assembly (30) installed at the other end of the track assembly (10), the secondary transmission box assembly (30) being provided with an upper belt pulley (33) and a lower belt pulley (34); An upper belt assembly (40) disposed in the upper transmission chamber (11), the upper belt assembly (40) being tensionedly connected to the upper transmission wheel (22) and the upper belt wheel (33); A lower belt assembly (50) is disposed in the lower transmission chamber (12), wherein the lower belt assembly (50) is tensionedly connected to the lower transmission wheel (23) and the lower belt wheel (34), and the main transmission box assembly (20) drives the upper belt assembly (40) and the lower belt assembly (50) to open and close independently.

2. The double-track device for opening and closing curtains according to claim 1, characterized in that: The main box body (21) is provided with an upper guide groove (211) and a lower guide groove (212); the upper belt assembly (40) is connected to the upper transmission wheel (22) along the upper guide groove (211); the lower belt assembly (50) is connected to the lower transmission wheel (23) along the lower guide groove (212); and the upper transmission wheel (22) and the lower transmission wheel (23) have a height difference in the direction of the rotation axis.

3. The double-track device for opening and closing curtains according to claim 2, characterized in that: The upper transmission wheel (22) and the lower transmission wheel (23) are arranged in a staggered manner in the length direction of the track assembly (10).

4. The double-track device for opening and closing curtains according to claim 2, characterized in that: The main transmission box assembly (20) is provided with a locking mechanism, which is plugged into the power device (60) and locked by twisting.

5. The double-track device for opening and closing curtains according to claim 4, characterized in that: The main transmission box assembly (20) comprises an upper transmission shaft (24) connected to the upper transmission wheel (22) and a lower transmission shaft (25) connected to the lower transmission wheel (23); the locking mechanism comprises a locking frame (26) rotatably connected to the lower transmission shaft (25) or the upper transmission shaft (24); the ends of the upper transmission shaft (24) and the lower transmission shaft (25) are both provided with a transmission part (241); the transmission part (241) is used for plugging and connecting to a power device (60); and the locking frame (26) is used for locking the main transmission box assembly (20) to the power device (60).

6. The double-track device for opening and closing curtains according to claim 5, characterized in that: The locking frame (26) comprises a rotating portion (261), a locking convex plate (262) protruding from the rotating portion (261), and a lever (263) connected to the rotating portion (261); the locking convex plate (262) protrudes from the surface of the main housing (21) and rotates after being inserted into the power device (60); the locking convex plate (262) and the hole wall of the power device (60) form an intersection; and the end of the lever (263) protrudes from the side of the main housing (21).

7. The double-track device for opening and closing curtains according to claim 6, characterized in that: The rotating part (261) is provided with a limiting groove (264) and limiting convex points (265) distributed in the limiting groove (264); the main box body (21) is provided with a positioning convex rib extending into the limiting groove (264); the positioning convex rib is limited to a preset area of ​​the limiting groove (264) after passing over the limiting convex point (265).

8. The double-track device for opening and closing curtains according to claim 1, characterized in that: The upper belt assembly (40) comprises an upper transmission belt (41) located in the upper transmission cavity (11) and an upper suspension arm connected to the upper transmission belt (41); the lower belt assembly (50) comprises a lower transmission belt (51) located in the lower transmission cavity (12) and a lower suspension arm (52) connected to the lower transmission belt (51); the upper suspension arm and the lower suspension arm (52) extend beyond the lower surface of the track assembly (10).

9. The double-track device for opening and closing curtains according to claim 1, characterized in that: The auxiliary transmission box assembly (30) comprises an auxiliary box body (31) and a partition frame (32) mounted on the auxiliary box body (31); the auxiliary box body (31) is provided with a gear shaft (311); the upper belt pulley (33) and the lower belt pulley (34) are rotatably connected to the gear shaft (311); and the partition frame (32) separates the upper belt pulley (33) and the lower belt pulley (34).

10. An opening and closing curtain, comprising a power device (60), characterized in that: The opening and closing curtain also includes the opening and closing curtain double track device according to any one of claims 1 to 9, and the power device (60) includes a first power assembly and a second power assembly, the first power assembly is drivingly connected to the upper transmission wheel (22), and the second power assembly is drivingly connected to the lower transmission wheel (23).

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