Curtain track, splicing method, driving device and electric curtain

Abstract

The invention discloses a curtain track, a splicing method, a driving device and an electric curtain. The curtain track comprises a track body formed by butting at least two track units that can be folded mutually. The annular track groove of the track body is used to embed an annular conveyor belt. An operation window for facilitating the cutting and splicing of the annular conveyor belt is arranged on the side wall of the track body. The track units can be folded mutually to shorten the length for convenient transportation. After the track units are butted, the user can adjust the length of the annular conveyor belt through the operation window and fix it with a splicing piece to complete the installation of the entire curtain track. The operation is simple and convenient, and the installation time of the user is reduced.

Description

Technical Field

[0001] The invention relates to an indoor electric curtain, in particular to a curtain track in the electric curtain and a splicing method. Background Art

[0002] Curtains are divided into manual curtains and electric curtains. Electric curtains include curtain tracks, motors, controllers and curtain bodies. The curtain bodies are arranged on the curtain tracks through pulleys, and the motor drives the curtain bodies to move on the curtain tracks through belts to realize the opening and closing of the curtain bodies.

[0003] As an important component of electric curtains, the track plays a very important role in daily use as a sliding carrier for the opening and closing of curtains. The belt is the carrier for the pulley to run, ensuring that the pulley runs on the track to achieve the purpose of opening and closing the curtain. In actual applications, some users need to install longer electric curtains, but the long curtain track is extremely inconvenient for transportation in the middle. Therefore, the usual practice is to divide the track into several shorter sub-tracks, and connect the sub-tracks when using them, which not only facilitates the transportation of the track, but also meets the needs of users.

[0004] The easy-to-install curtain track with application publication number CN104814650A is achieved by adding a filling piece at the joint of two sub-tracks, thereby lengthening the belt. When the sub-tracks are joined, the filling piece can be directly inserted between the sub-tracks and fixed with splicing pieces to complete the installation of the entire curtain track. The operation is simple and convenient, and the disassembly and assembly of sliding parts is eliminated, which greatly facilitates the user's use.

[0005] The inventor provides a technical approach of cutting the excess length of the belt and then splicing it to fit the curtain track. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a curtain track for cutting and splicing a conveyor belt after the track units are docked, and further provide a driving device and an electric curtain having the above-mentioned curtain track.

[0007] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a curtain track for electric curtains includes a track body formed by connecting at least two mutually foldable track units, the annular track groove of the track body is used to embed an annular conveyor belt; an operating window is provided on the side wall of the track body for facilitating the cutting and splicing of the annular conveyor belt.

[0008] A further optimized solution of the present invention is that part of the endless conveyor belt can be pulled out from the operating window.

[0009] A further optimized solution of the present invention is: it also includes a cover for sealing the operating window.

[0010] A further optimized solution of the present invention is: the track body includes a straight rail in the middle and transmission boxes at both ends, the straight rail and the transmission box are hollow structures interconnected, and the annular track groove is arranged inside the straight rail and the transmission box.

[0011] A further optimization scheme of the present invention is: synchronous transmission wheels are provided at both ends of the track body, the annular conveyor belt is wound around the synchronous transmission wheels, the annular track groove includes a straight section and a curved section, and the synchronous transmission wheel is located on the inner side of the curved section.

[0012] A further optimized solution of the present invention is that the synchronous transmission wheel is located in the transmission box, and the operation window is opened on the side wall of the transmission box.

[0013] A further optimized solution of the present invention is: the annular conveyor belt includes a splicing portion, the splicing portion is formed by two free ends being butted and fixed together. The splicing portion also includes a splicing piece, the splicing piece butts and fixes the two free ends together, the splicing piece can be inserted and removed from the window, and the splicing portion is limited to move in the straight section of the annular track groove.

[0014] Another subject of the present invention is: a method for splicing curtain tracks, comprising the following steps: docking mutually folded track units; pulling out an annular conveyor belt from a window on a side wall of a track body; cutting the annular conveyor belt to match the length of an annular track groove in the track body; docking and fixing two free ends to form a splicing portion; and inserting the pulled-out portion of the annular conveyor belt into the annular track groove from the operating window.

[0015] Another subject of the present invention is: a driving device, including the curtain track, an annular conveyor belt, a motor for driving the annular conveyor belt to move, and a pulley assembly for hanging the curtain body, wherein the annular conveyor belt drives the pulley assembly to move to realize the opening and closing of the curtain body.

[0016] Another subject of the present invention is: an electric curtain, comprising a curtain body and the driving device.

[0017] Compared with the prior art, the advantage of the present invention is that the track units are flexibly connected by an annular conveyor belt, so they can be folded together to shorten the length and facilitate transportation. After the track units are docked, the user can adjust the length of the annular conveyor belt through the operation window and fix it with splicing parts to complete the installation of the entire curtain track. The operation is simple and convenient, which reduces the user's installation time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described in detail below in conjunction with the accompanying drawings and preferred embodiments, but those skilled in the art will appreciate that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be used as a limitation on the scope of the present invention. In addition, unless otherwise specified, the drawings are only schematically representing the composition or structure of the described objects and may contain exaggerated displays, and the drawings are not necessarily drawn to scale.

[0019] Figure 1 A schematic diagram of an electric curtain according to a preferred embodiment of the present invention;

[0020] Figure 2 A schematic diagram of a driving device according to a preferred embodiment of the present invention;

[0021] Figure 3 A schematic diagram of a curtain track according to a preferred embodiment of the present invention Figure 1 ;

[0022] Figure 4 A schematic diagram of a curtain track according to a preferred embodiment of the present invention Figure 2 ;

[0023] Figure 5 A schematic diagram of a transmission box of a preferred embodiment of the present invention Figure 1 ;

[0024] Figure 6 A schematic diagram of a transmission box of a preferred embodiment of the present invention Figure 2 ;

[0025] Figure 7 An exploded view of a transmission case according to a preferred embodiment of the present invention;

[0026] Figure 8 A schematic diagram of one end of a curtain track according to a preferred embodiment of the present invention;

[0027] Fig. 9 An exploded view of one end of a curtain track according to a preferred embodiment of the present invention;

[0028] Fig.10 A schematic diagram of one end of a track body according to a preferred embodiment of the present invention;

[0029] Fig.11 A schematic diagram of one end of an endless conveyor belt according to a preferred embodiment of the present invention;

[0030] Fig.12 A partial schematic diagram of an endless conveyor belt according to a preferred embodiment of the present invention;

[0031] Fig.13 A schematic diagram of a splicing piece according to a preferred embodiment of the present invention Figure 1 ;

[0032] Fig.14 A schematic diagram of a splicing piece according to a preferred embodiment of the present invention Figure 2 ;

[0033] Fig.15 It is a schematic diagram of the installation of a splicing piece and an endless conveyor belt according to a preferred embodiment of the present invention;

[0034] Fig.16 A schematic diagram of the first step of installing a curtain track according to a preferred embodiment of the present invention;

[0035] Fig.17 A schematic diagram of the second step of installing a curtain track according to a preferred embodiment of the present invention;

[0036] Fig.18 A schematic diagram of the third step of installing a curtain track according to a preferred embodiment of the present invention;

[0037] Fig.19 This is a schematic diagram of the fourth step of installing a curtain track according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0038] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It will be appreciated by those skilled in the art that these descriptions are only illustrative and exemplary and should not be construed as limiting the scope of protection of the present invention.

[0039] It should be noted that like reference numerals denote similar items in the following drawings, and thus, once an item is defined in one drawing, it may not be further defined or explained in subsequent drawings.

[0040] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0041] like Figure 1 , 2As shown, the electric curtain comprises a curtain body 100 and a driving device 200. The driving device 200 comprises a curtain track 01, an annular conveyor belt 02 wound in the curtain track, and a motor 03 for driving the annular conveyor belt 02 to move. A pulley assembly 04 for hanging the curtain body 100 is provided on the annular conveyor belt 02. When the motor 03 is running, the annular conveyor belt 02 is driven to drive the pulley assembly 04 to move on the curtain track 01 to realize the opening and closing of the curtain body 100.

[0042] like Figure 3-4 As shown, the curtain track 01 includes a track body 01A formed by connecting at least two mutually foldable track units 001, and a circular track groove 01B for embedding the circular conveyor belt 02 is provided in the track body 01A. An operation window 01C is provided on the side wall of the track body 01A for cutting and splicing the circular conveyor belt 02. Part of the circular conveyor belt 02 can be pulled out from the operation window 01C for cutting and splicing.

[0043] Further, such as Figure 3-9 As shown, the track body 01A includes a straight track A1 in the middle and a transmission box A2 at both ends. The housing K of the straight track A1 and the transmission box A2 are hollow structures interconnected with each other, and the annular track groove 01B is arranged inside the two. The annular track groove 01B includes a straight section B1 and a curved section B2. Synchronous transmission wheels 1 are arranged at both ends of the track body 01A, and the annular conveyor belt 02 is wound around the synchronous transmission wheel 1.

[0044] like Figure 7 As shown, the transmission box A2 includes a box body 2 and a box cover 3, and the synchronous transmission wheel 1 is located in the cavity of the box body 2 of the transmission box A2. It should be noted that the openable transmission box A2 structure is convenient for subsequent maintenance, and secondly, when assembling the track provided by the present invention, the excess length of the endless conveyor belt 02 can be determined by opening the transmission box A2, thereby ensuring the accuracy of subsequent cutting.

[0045] Preferably, if Figure 4 As shown, the transmission box A2 includes a main transmission box A21 and an auxiliary transmission box A22, and the corresponding synchronous transmission wheel 1 in the transmission box A2 is the main transmission wheel and the auxiliary transmission wheel. Among them, the main transmission box A21 is fixedly connected to the motor 03, and the output shaft of the motor 03 passes through the main transmission box A21 and is fixedly connected to the main transmission wheel inside it. The operation of the motor 03 causes the main transmission wheel to rotate and drives the annular transmission belt to move, thereby transmitting the power of the main transmission wheel to the auxiliary transmission wheel, so that the main transmission wheel and the auxiliary transmission wheel can achieve synchronous rotation.

[0046] like Figure 5-10As shown, preferably, an operation window 01C is provided on the side wall of the transmission box A2. Further, in the double opening state, the main transmission box A21 and the auxiliary transmission box A22 are each provided with an operation window 01C, and the two are located on two sides of the track body away from each other.

[0047] Preferably, if Figure 5 , 7 As shown, a cover 4 is provided outside the operating window 01C for sealing the operating window 01C, which can prevent dust and water vapor from entering the track body 01A and affecting the internal accessories, and can also keep the integrity and aesthetics of the entire curtain track 01.

[0048] like Figure 3 As shown, preferably, the pulley assembly 04 includes a first pulley 04A and a second pulley 04B, wherein the first pulley 04A is fixedly connected to the inner side of the circular conveyor belt 02 on the straight section B1 of the circular track groove 01B on one side; and the second pulley 04B is fixedly connected to the circular conveyor belt 02 on the opposite side. The circular conveyor belt 02 rotates forward or reversely under the drive of the motor 03, so that the first pulley 04A and the second pulley 04B move relative to or oppositely with the movement of the circular conveyor belt 02, thereby realizing the synchronous opening and closing displacement between the first pulley 04A and the second pulley 04B: in the first state, the first pulley 04A and the second pulley 04B are located at the two ends of the track body 01A away from each other; in the second state, the first pulley 04A and the second pulley 04B are located close to each other in the middle of the track body 01A.

[0049] It should be understood that the curtain body 100 may include a first curtain body and a second curtain body respectively suspended on a first pulley 04A and a second pulley 04B, and the first pulley 04A and the second pulley 04B are synchronously opened and closed, thereby realizing the opening and closing of the curtain body 100 suspended on the pulley assembly 04.

[0050] like Figure 4 , 16 As shown in Figure 17, multiple track units 001 are independent from each other, and a track groove with at least one end open is set inside, and an annular conveyor belt 02 with a total length greater than the total length of the annular track groove 01B is embedded in the track groove of the track unit 001, thereby flexibly connecting multiple track units 001. During transportation, the rigid connection between the track units 001 is separated, and they are flexibly connected to each other by the annular conveyor belt 02, so that they can be folded together to shorten the length for convenient transportation.

[0051] like Figure 3-10As shown in 18-19, after multiple track units 001 are docked, a track body 01A is formed, and each track groove is interconnected. The track groove at the end of the outermost track unit 001 is bent, so that the track grooves of multiple track units 001 are combined to form an annular track groove 01B, and the annular conveyor belt 02 embedded in the annular track groove 01B fits in the track groove. The excess length of the annular conveyor belt 02 can be pulled out from the operating window 01C for cutting to match the length of the annular conveyor belt 02 with the annular track groove 01B.

[0052] The cut endless conveyor belt 02 forms two free ends, which are butt-jointed and fixed to close the conveyor belt into a loop again, and form a joint 02B at the butt-jointed position. After the butt-joint is completed, the joint 02B is inserted into the operation window 01C. Preferably, the butt-joint fixing method can be glue bonding, thread sewing, hot pressing connection or splicing piece connection.

[0053] Preferably, the operation window 01C is arranged near the straight section B1 of the annular track groove 01B, thereby reducing the limitation of the docking and fixing method of the cut conveyor belt and avoiding obstacles for the splicing piece 02C of the docked and fixed annular conveyor belt 02 to pass around the synchronous transmission wheel 1.

[0054] Preferably, through reasonable assembly mode and motor 03 operation setting, such as Fig.19 As shown, the splicing portion 02B is limited to move within the straight line segment B1 during the movement of the endless conveyor belt 02, so that the free end of the cut endless conveyor belt 02 can be docked with the splicing piece 02C.

[0055] Preferably, the two free ends of the splicing piece 02C are butt-jointed and fixed together, and the splicing piece 02C can be inserted and removed from the operation window 01C, and the two free ends after butt-jointing and fixing are close to or at a distance from each other, so as to realize the quick butt-jointing and fixing of the free ends of the cut endless conveyor belt to re-form into an annular shape, making the installation process more convenient, labor-saving and quick.

[0056] like Figure 12-15 As shown, preferably, the splicing piece 02C includes a mother buckle C1 and a child buckle C2 that engage with each other, and the mother buckle C1 and the child buckle C2 enclose a belt groove 5 for installing two free ends, and the belt groove 5 has open free ends at both ends extending outward from the opening.

[0057] Furthermore, the annular conveyor belt 02 includes a belt body 021 and belt teeth 022 on one side, and the belt groove 5 includes a groove body 51 for accommodating the belt body 021 and a tooth groove 52 that matches the belt teeth 022 at the free end, and the belt teeth 022 are engaged with the tooth groove 52 to laterally fix the free end.

[0058] Preferably, the mother buckle C1 and the child buckle C2 are engaged along the width direction of the endless conveyor belt 02, the mother buckle C1 is provided with a longitudinal slot 6, the child buckle C2 is provided with a clamping portion 7 matching the slot 6, and the clamping portion 7 is inserted into the slot 6 to engage the mother buckle C1 and the child buckle C2.

[0059] Specifically, the mother buckle C1 is provided with a first belt groove section 5a, one side of the first belt groove section 5a is a first assembly port 51A, and the two free ends of the endless conveyor belt 02 are inserted into the first belt groove section 5a from the first assembly port 51A and are respectively led out from the openings at both ends. Correspondingly, the child buckle C2 is provided with a second belt groove section 5b, and the second belt groove section 5b matches the first belt groove section 5a in structure, and the two together enclose the belt groove 5.

[0060] The first belt groove section 5a includes a first groove body and a first tooth groove. A longitudinal clamping groove 6 connected to the first groove body is provided on one side of the first belt groove section 5a. The cross section of the longitudinal clamping groove 6 is a rectangle extending along the length direction of the free end. The sub-clip C2 is provided with a clamping portion 7 that matches the clamping groove 6 and protrudes to one side. The clamping portion 7 is inserted into the clamping groove 6 to engage the mother clamp C1 with the sub-clip C2.

[0061] A locking hole 6A is provided on the outer wall of the card slot 6, and a locking buckle 7A is provided on the card portion 7. Preferably, the locking hole 6A is a plurality of square holes arranged in parallel along the length direction, and the locking buckle 7A is a square boss, and the position, shape and size match the locking hole 6A. When the card portion 7 is inserted into the card slot 6, the locking buckle 7A extends into the locking hole 6A to lock the mother buckle C1 and the child buckle C2, so that the mother buckle C1 and the child buckle C2 are firmly connected to firmly connect the two free ends of the endless conveyor belt 02 to the splicing piece 02C.

[0062] In order to further improve the positioning accuracy when the mother buckle C1 and the child buckle C2 are engaged, and facilitate the lock buckle 7A to smoothly extend into the lock hole 6A, the child buckle C2 is provided with a plurality of longitudinally extending positioning pins 8, preferably, the positioning pins 8 are parallelly distributed square columns located on the side of the second grooved section 5b away from the clamping portion 7. The mother buckle C1 is provided with a plurality of positioning grooves 9 that match the positioning pins 8, and the positioning pins 8 are inserted into the positioning grooves 9 to position the mother buckle C1 and the child buckle C2.

[0063] During the actual installation process, Fig.16 As shown, in the first step, the user first takes the folded curtain track 01 out of the packaging box and unfolds it into a straight line; then each track unit 001 of the unfolded curtain track 01 is closely connected with each other; in the second step, as shown in FIG. Fig.17 As shown, slide the pulley assembly to the end position on the transmission box side. If it is a double-opening situation, move the pulley assembly 04 to the end points on both sides of the main transmission box A21 and the auxiliary transmission box A22.

[0064] The third step is Fig.18As shown, in the single-opening case, open the box cover 3, confirm the excess length of the circular conveyor belt 02 that needs to be cut, for example, it is 0.2m longer, pull the circular conveyor belt 02 to make the circular conveyor belt 02 taut and close to the circular track groove 01B and the synchronous transmission wheel 1; pull the circular conveyor belt 02 out of the operating window 01C on the side wall of the track body 01A; cut the circular conveyor belt 02 and cut off the excess part to match the length of the circular track groove 01B in the track body 01A.

[0065] In the double opening situation, after opening the box cover 3 of the main transmission box A21 and the cover 4 of the operating window 01C, cut off half of the excess length of the circular conveyor belt 02, if it is 0.2m more, cut off 0.1m; then after splicing this section of the circular conveyor belt 02, open the box cover 3 of the auxiliary transmission box A22 and the cover 4 of the operating window 01C, and cut off the other half of the excess length of the circular conveyor belt 02, that is, cut off another 0.1m.

[0066] The fourth step is Fig.19 As shown, the cut circular conveyor belt 02 forms two free ends, which are fixed by gluing, sewing, hot pressing or splicing, and then the splicing part is inserted into the circular track groove 01B from the operation window 01C. When the splicing part 02C is used, the user first embeds the two free ends on both sides of the first belt groove section 5a of the female buckle C1 of the splicing part 02C; the sub-buckle C2 is engaged with the female buckle C1, and the two free ends of the circular transmission belt are firmly connected; the pulled-out part of the circular conveyor belt 02, including the splicing part 02C, is inserted into the circular track groove 01B from the operation window 01C.

[0067] Step 5: Replace the box cover 3 and the cover 4 of the operating window 01C, and the installation of the curtain track 01 is completed.

[0068] When using such a curtain track, when the track units are connected, the user fixes each track unit with fasteners, adjusts the length of the circular conveyor belt through the operation window, and fixes it with splicing parts to complete the installation of the entire curtain track. The operation is simple and convenient, which reduces the user's installation time and facilitates the user's use.

[0069] It should be understood that when the length of the endless conveyor belt is too short, the same method can be used to cut the endless conveyor belt through the operating window and then connect another end to achieve a lengthening effect.

[0070] After the curtain track provided in this embodiment is installed, the length of the circular conveyor belt can be conveniently shortened or extended to cope with the situation where the original circular conveyor belt is too long or too short, so as to achieve the best transmission effect and meet user needs.

[0071] The above is a detailed introduction to the curtain track, splicing method, driving device and electric curtain provided by the present invention. The principle and implementation method of the present invention are described in detail using specific examples. The description of the above embodiments is only used to help understand the present invention and its core ideas. It should be pointed out that for ordinary technicians in this technical field, the present invention can also be improved and modified without departing from the principle of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. Curtain track, used for electric curtains, characterized by It includes at least two mutually foldable track units connected together The track body is formed, and the annular track groove of the track body is used to embed the annular conveyor belt; the side wall of the track body is provided with an operation window for cutting and splicing the annular conveyor belt; The track body comprises a straight track in the middle and transmission boxes at both ends. The straight track and the transmission box are hollow structures interconnected with each other, and the annular track groove is arranged inside the straight track and the transmission box. Synchronous transmission wheels are arranged at both ends of the track body, the annular conveyor belt is wound around the synchronous transmission wheels, the annular track groove includes a straight section and a curved section, and the synchronous transmission wheel is located inside the curved section; The synchronous transmission wheel is located in the transmission box, and the operation window is opened on the side wall of the transmission box; The endless conveyor belt comprises a splicing portion, and the splicing portion is formed by two free ends being butted and fixed; The splicing part further comprises a splicing piece, the splicing piece butts and fixes the two free ends together, the splicing piece can be moved in and out of the window, and the splicing part is limited to move in the straight line section of the annular track groove; The multiple track units are independent of each other, and a track groove with at least one end open is set inside the track units, and an annular conveyor belt with a total length greater than the total length of the annular track groove is embedded in the track groove of the track unit, thereby flexibly connecting the multiple track units; During transportation, the rigid connections between the track units are separated and they are flexibly connected to each other via an endless conveyor belt; After multiple track units are docked, the track grooves are interconnected, and the track groove at the end of the outermost track unit is bent, so that the track grooves of multiple track units together form an annular track groove, and the annular conveyor belt embedded in the annular track groove fits snugly in the track groove.

2. The curtain track according to claim 1, characterized in that: After a plurality of track units are docked, the excess length of the endless conveyor belt can be pulled out from the operation window and cut to match the length of the endless conveyor belt with that of the endless track groove.

3. The curtain track according to claim 1, characterized in that: Also includes a cover for sealing the operation window; The cut circular conveyor belt forms two free ends, which are butted and fixed to close the conveyor belt into a circular shape again, and a joint is formed at the butted and fixed position; after the butt joint is completed, the joint is inserted into the operation window; The butt-jointing fixing method is one or more of glue bonding, thread sewing, heat pressing connection or splicing piece connection.

4. The curtain track according to claim 3, characterized in that: The operation window is arranged adjacent to the straight section of the annular track groove.

5. The curtain track according to claim 1, characterized in that: The splicing piece includes a mother buckle and a child buckle that engage with each other; the mother buckle and the child buckle enclose to form a belt groove for installing two free ends; The open free ends at both ends of the belt groove extend outwardly from the opening; The endless conveyor belt comprises a belt body and belt teeth on one side, the belt groove comprises a groove body for accommodating the belt body and a tooth groove matched with the belt teeth at the free end, and the belt teeth are engaged with the tooth groove to fix the free end laterally.

6. The curtain track according to claim 5, characterized in that: The mother buckle and the child buckle are engaged along the width direction of the endless conveyor belt. The mother buckle is provided with a longitudinal slot, and the child buckle is provided with a clamping part matching the slot. The clamping part is inserted into the slot to engage the mother buckle and the child buckle.

7. A method for splicing curtain rails according to any one of claims 1 to 6, characterized in that The method comprises the following steps: docking the folded track units; pulling the annular conveyor belt out of the window on the side wall of the track body; cutting the annular conveyor belt to match the length of the annular track groove in the track body; docking and fixing the two free ends to form a splicing part; and inserting the pulled-out part of the annular conveyor belt into the annular track groove from the operation window.

8. A driving device, comprising a curtain track as claimed in any one of claims 1 to 6, an endless conveyor belt, a motor for driving the endless conveyor belt to move, and a pulley assembly for hanging a curtain body, wherein the endless conveyor belt drives the pulley assembly to move to realize the opening and closing of the curtain body; The pulley assembly includes a first pulley and a second pulley, wherein the first pulley is fixedly connected to the inner side of the annular conveyor belt on the straight section of the annular track groove on one side; the second pulley is fixedly connected to the annular conveyor belt on the opposite side; the annular conveyor belt rotates forward or reversely under the drive of the motor, so that the first pulley and the second pulley move relative to or oppositely with the movement of the annular conveyor belt, thereby realizing the synchronous opening and closing displacement between the first pulley and the second pulley: In the first state, the first pulley and the second pulley are located at two ends of the track body away from each other; In the second state, the first pulley and the second pulley are close to each other and located in the middle of the track body; The curtain body comprises a first curtain body and a second curtain body respectively suspended on a first pulley and a second pulley. The first pulley and the second pulley are synchronously opened and closed, thereby realizing the opening and closing of the curtain body suspended on the pulley assembly.

9. Electric curtains, characterized by It comprises a curtain body and the driving device as claimed in claim 8.

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