WO2023125037A1

WO2023125037A1 - Louver turnover linkage structure and louver structure

Info

Publication number: WO2023125037A1
Application number: PCT/CN2022/139264
Authority: WO
Inventors: 区应绍
Original assignee: 佛山市磁家有导科技有限公司
Priority date: 2021-12-31
Filing date: 2022-12-15
Publication date: 2023-07-06
Also published as: CN114016888A; CN114016888B

Abstract

Provided by the present invention are a louver turnover linkage structure and a louver structure, belonging to the field of sunshade equipment; the linkage structure comprises a position-limiting structure and an inclined rail, said louver structure being equipped with the position-limiting structure and the inclined rail, and also comprises a frame and blades rotationally mounted on the frame, the blades being driven by a power assembly mounted on the frame in a sliding manner; the position-limiting structure limits the synchronous overturning of all of the blades, while the position-limiting structure also is mounted on the inclined rail in a sliding manner; the driving force of a drive structure is dispersed by the fitting of the position-limiting structure and the inclined rail, such that one motor can drive the blades to be stacked and pulled open, and when the blades are completely pulled open, the blades continue to be pulled to achieve overturning and closing, so that one motor can control the overturning and stacking of the blades; the manufacturing cost is reduced and various problems caused by uncoordinated multiple motors are avoided; the linkage structure and the louver structure provided by the present invention have the advantages of being reasonable in structure and low in manufacturing cost and being unlikely to be damaged.

Description

A louver flip linkage structure and louver structure

technical field

The invention belongs to the field of sunshade equipment, and in particular relates to a louver turning linkage structure, and also relates to a louver structure which adopts the linkage structure and can realize stacking and turning.

Background technique

The sun room, the skylight of some buildings, the patio or the roof scaffolding will be applied to the louver structure for sunshade and water protection, but the current louver structure is mostly fixed blades, or the blades can only be turned over for ventilation, and all the blades cannot be stacked. On the one hand, a better viewing effect and ventilation effect are formed, and at the same time, the blades of the existing flip louvers are turned asynchronously, which may easily cause blade collisions to generate noise and accelerate damage to the blades. Some louver structures that can simultaneously flip and stack blades require at least two motors to control, which is expensive to manufacture and difficult to control. During use, many problems are often caused by the incoordination between the two motors , or even damage, which affects the use experience and restricts the development of the louver structure.

technical solution

Based on the above-mentioned problems in the prior art, the present invention provides a louver flip linkage structure, which includes a ramp that is fixedly installed on the frame of the louver and is inclined relative to the extension direction of the frame. The limit structure of the synchronous limit connection of the blade in the direction perpendicular to the extension of the frame.

Wherein, when the blades turn over, the position-limiting structure forms a position-limiting connection with at least one of the blades in the forward direction of the blades.

Wherein, the position-limiting structure is a slide bar or a U-shaped rail, and the blade is slidably connected to the slide bar through a rod sleeve or slidably connected to the U-shaped rail through parallel wheels; the described slide bar or U-shaped The rails are then slidably connected to the ramps by lifting trolleys.

Wherein, the lifting tackle includes a mounting base plate that is mounted to both ends of the slide bar or the back of the U-shaped rail for rotation, and at least three lifting pulleys are installed for rotation on the mounting base plate, and all lifting pulleys are divided into two groups, and the two groups of lifting pulleys are mutual dislocation installation; the inclined rail includes a track seat, a rail groove is opened on one side of the track seat, and a steel rail is fixedly installed on the side walls of both sides of the rail groove, and the diameter of the lifting pulley is smaller than that of the rail The width of the slot, two sets of lifting pulleys are slidingly connected with two steel rails respectively, and at least one lifting pulley in the two sets of lifting pulleys is set alternately.

Wherein, the lifting tackle includes a trolley seat that is installed on both ends of the slide bar or on the back of the U-shaped rail for rotation. A pulley cavity is arranged in the trolley seat, and a plurality of lifting pulleys are arranged on both sides of the pulley cavity. A space matching the width of the ramp is left between the lifting pulleys; a steel rail slidingly matched with the lifting pulley is provided on both sides of the ramp.

The present invention also provides a louver structure, which is equipped with the above-mentioned louver turning linkage structure, which includes a frame in detail, and a slide rail is arranged on the frame along the extending direction of the frame, and a plurality of blades are installed on the slide rail, and the blades are connected by transmission. To the power assembly and driven by the power assembly to slide and install on the slide rail, the frame is fixedly installed with the inclined rail at one side of the slide rail, and the blade slides and is perpendicular to the extending direction of the frame The synchronous limit is connected to the limit structure.

Wherein, a plurality of leaf blocks are provided on the slide rail corresponding to the blades one by one; the blades are provided with a power shaft, and the power shaft is connected to the leaf block by rotation, and the leaf block is then connected to the power assembly by transmission; The blades are also provided with parallel shafts, and one side of the parallel shafts in the same direction of all the blades is slidably connected to the same stop structure, and the stop structure restricts each parallel shaft from extending in a direction perpendicular to the frame. in the same position.

Wherein, the position-limiting structure is a U-shaped rail with a "U"-shaped cross-section, the two ends of the U-shaped rail are sealed, and the ends of the parallel shafts are provided with parallel wheels matching the U-shaped rail. The parallel wheels on the same side of all blades are inserted into the same U-shaped rail, and the parallel wheels can slide in the U-shaped rail.

Wherein, the frame is provided with a sliding area, and a plurality of slide rails are arranged in the sliding area, and translation pulleys matching the slide rails are provided on the leaf block; the frame is provided with a In the transmission area, a chain rubber sleeve is fixedly installed in the transmission area, and a chain groove is arranged on the chain rubber sleeve, and a part of a closed-loop chain is arranged in the chain groove. The closed-loop chain starts from one end of the frame and passes through the chain groove. Protrude from the other end of the chain groove and go around to the upper surface of the frame, and then return to the starting point after passing through the upper surface of the frame to form a closed loop; both ends of the frame are provided with reversing gears that mesh with the closed-loop chain, one of which is reversing The gear transmission is connected to the drive motor; one of the leaf blocks at the far end is fixedly connected to one of the closed-loop chains and serves as the active block, and the rest of the leaf blocks are passive blocks. The end with the active block is the starting end and the other end is the end. , all the leaf tackles are connected with steel cables, and the steel cables at the most end of the end are fixedly connected to the frame, and the driving motor drives the active tackle to move and cooperates with the steel cables to pull the passive tackle in turn; the parallel shaft of the most end blade Non-slidable rotary connection to the U-shaped rail, or the parallel wheel at the starting end moves to the extreme end of the starting end of the U-shaped rail when the last passive block is pulled, or the parallel shaft of the final blade. Non-slidable rotary connection When the U-shaped rail is pulled and the passive block at the end is pulled, the parallel wheels at the starting end move to the extreme end of the starting end of the U-shaped rail.

Beneficial effect

The beneficial effect that the present invention has:

1. The invention uses a limiting structure to limit the turning of the blades, so that all the blades can be turned synchronously, avoiding blade collisions caused by asynchronous turning, avoiding the formation of collision noise and damage to the blades.

2. The present invention disperses the driving force of the drive structure to the blades through the cooperation of the limit structure and the inclined rail, so that a motor can drive the blades to perform translational stacking, and when the blades are completely pulled apart, the blades can be continuously pulled to make The blades are flipped and closed, so that one motor can control the flipping and stacking of the blades, reducing production costs and avoiding various problems caused by incoordination between multiple motors.

3. The design of two sets of misplaced lifting pulleys makes the connection between the lifting block and the inclined rail more stable and firm, which can avoid the swing of the limit structure and improve the stability of the entire louver structure.

Description of drawings

Fig. 1 is a three-dimensional structural schematic diagram of a louver flip linkage structure in Embodiment 1.

Fig. 2 is an enlarged view of A in Fig. 1 .

Fig. 3 is an exploded schematic view of the part shown in Fig. 2 .

Fig. 4 is an exploded schematic diagram of another angle of the part shown in Fig. 2 .

Fig. 5 is a front plan view of the part shown in Fig. 2 .

Fig. 6 is a schematic diagram of the installation of a louver flip linkage structure in the first embodiment.

Fig. 7 is a schematic diagram of a partial three-dimensional structure of a louver flip linkage structure in the second embodiment.

Fig. 8 is a schematic perspective view of a louver flip linkage structure in Embodiment 3.

Fig. 9 is a schematic perspective view of the louver structure in Embodiment 4.

FIG. 10 is an enlarged view of B in FIG. 9 .

Fig. 11 is a side cross-sectional plan view of the louver structure in Embodiment 4.

Fig. 12 is a schematic diagram of the structure in the frame and the connection between the frame and the blades.

Fig. 13 is a schematic diagram of a partial three-dimensional structure of the louver structure in Embodiment 4, which hides part of the frame structure.

BEST MODE FOR CARRYING OUT THE INVENTION

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Embodiment 1: A louver flip linkage structure.

As shown in Figures 1-6, a louver flip linkage structure includes three inclined rails 1 fixedly installed on the frame 4 of the louver. In practical applications, it is necessary to set an appropriate number of inclined rails 1 according to the length of the louver structure. , taking the direction shown in Figure 6 as a reference, the frame 4 extends horizontally, the right end of the ramp 1 is inclined upward relative to the extension direction of the frame 4, and the three ramps 1 are respectively installed with the same limit structure that slides simultaneously through a lifting block 3 2. The limiting structure 2 is a U-shaped rail. When in use, the parallel shafts 52 of all the blades 5 of the entire louver structure extend into the U-shaped rail and slide on the U-shaped rail through the parallel wheels 22, and the U-shaped rail The parallel shafts 52 capable of constraining all blades 5 move synchronously in the vertical direction. During installation and application, the length of the limiting structure 2 should be appropriate, so that when the blades 5 are overturned, the limiting structure 2 and at least one of the blades 5 form a limiting connection in the forward direction of the blade 5, such as a U-shaped rail. It is closed at both ends. When the blades 5 of the louver structure are fully pulled apart, the parallel wheel 22 of the first blade 5 just reaches the side end of the U-shaped rail, or the parallel wheel 22 of the last blade 5 is fixed on the U-shaped rail. on the rail, so that the parallel shaft 52 of the last blade 5 can only rotate relative to the U-shaped rail and cannot slide, so that the blade 5 will drive the U-shaped rail to move together and move along the inclined rail when the blade 5 is completely pulled apart and then continues to be pulled. 1 rises, thereby realizing the turning over of blade 5.

As a preferred embodiment, the lifting block 3 includes a rotating mounting base 31 installed on the back of the U-shaped rail. As shown in Figure 4, a U-shaped clip 33 is welded on the back of the U-shaped rail, and then the mounting base 31 is riveted. On the U-shaped clip 33, the rivets can be prevented from affecting the sliding of the parallel wheels 22 in the U-shaped rail. Four lifting pulleys 32 are installed on the installation base plate 31, and all lifting pulleys 32 are divided into two groups, and each group contains two Lifting pulley 32, two groups of lifting pulleys 32 are misplaced and installed apart from each other; described inclined rail 1 includes track seat 11, and one side of described track seat 11 is provided with rail groove, and the two side walls of the rail groove are respectively fixed. A steel rail 12 is installed, and the lifting pulley 32 is provided with a groove matching the steel rail 12. The diameter of the lifting pulley 32 is smaller than the width of the rail groove, and two groups of lifting pulleys 32 are respectively slidingly connected with two steel rails 12, namely One set of lifting pulleys 32 is fitted and slidably connected to the left rail 12, and the other set of lifting pulleys 32 is fitted and slidably connected to the right rail 12. At least one lifting pulley 32 in the two sets of lifting pulleys 32 is arranged alternately. . In this embodiment, the lifting pulleys 32 are set at misaligned intervals, and the two sets of lifting pulleys 32 limit the lifting tackle 3 to avoid shaking of the lifting tackle 3 and improve the stability and smoothness of the entire structure.

Embodiment 2: A louver flip linkage structure.

The difference between this embodiment and Embodiment 1 is that the specific structure of the lifting trolley 3 and the inclined rail 1 is different. As shown in Figure 7, the lifting trolley 3 includes rotating parts mounted on both ends of the slide bar or U The pulley seat 34 on the back side of the shaped rail is provided with a pulley cavity in the pulley seat 34, and two lifting pulleys 32 are arranged on both sides of the pulley cavity, and four lifting pulleys 32 are arranged symmetrically on both sides. The lifting pulleys 32 on both sides A space matching the width of the ramp 1 is left between them; both sides of the ramp 1 are provided with a ramp 1 that is slidingly matched with the lifting pulley 32, and the lifting block 3 together with the limiting structure 2 passes through the lifting pulley 32 and the cooperating sliding of steel rail 12 are installed on the inclined rail 1.

Embodiment 3: A louver flip linkage structure.

The difference between this embodiment and Embodiment 1 is that the limit structure 2 uses a slide bar instead of a U-shaped rail. As shown in Figure 8, the limit structure 2 is a slide bar, and the parallel shaft 52 of the blade 5 The rotating part is connected with the rod sleeve 21, and is then slidably connected to the slide rod through the rod sleeve 21. In order not to affect the sliding of the rod sleeve 21, only the two ends of the slide rod are rotated to connect the above-mentioned installation base plate 31, and then slide by lifting the tackle 3 Connect to ramp 1. Both the slide bar and the U-shaped rail can allow the blades 5 to slide on it, so that the stacking translation of the blades 5 can be realized, and then the upper and lower positions of the blades 5 can be limited when the blades 5 are turned over, so as to ensure that the blades 5 rotate synchronously and avoid mutual collision. At the same time, the linkage structure cooperates with the corresponding limit setting to convert and reverse the driving force of the motor, so as to realize the translational stacking and flipping and closing of a motor-driven blade.

Embodiment 4: A louver structure.

A louver structure as shown in accompanying drawings 1-13, includes a frame 4 symmetrically arranged on both sides, and a horizontal material is arranged at both ends of the frame 4 to form a rectangular frame, and each frame 4 is arranged along the extending direction of the frame 4 There are four slide rails 41, two horizontal slide rails and two vertical slide rails, and fourteen leaf tackles 42 are installed slidingly on the slide rails 41 of each frame 4, and each leaf tackle 42 slides with four slide rails 41 at the same time connection, the corresponding leaf tackle 42 on the frame 4 on both sides is connected with the same blade 5 for rotation, that is, a total of fourteen blades 5, each of the two ends of each blade 5 is connected with a leaf tackle 42, and the blade 5 passes through the blade. The trolley 42 is slidably installed on the slide rail 41; the frame 4 is fixedly installed with the louver turning linkage structure described in Embodiment 1 on the outer surface of the side close to the blade 5, and the limiting structure 2 is a section U-shaped rail in the shape of "U", the two ends of the U-shaped rail are sealed, and the three inclined rails 1 are fixedly installed on the frame 4, as shown in Figure 11, the frame 4 can be provided with nut grooves 47, and the two nut grooves 47 Nuts are fixed in advance, and then the ramp 1 is fixedly installed on the frame 4 through the cooperation of the bolts 48 and the nuts; the blade 5 is provided with a power shaft 51, and the power shaft 51 is connected to the leaf block 42 for rotation, and the blade The pulley 42 is connected to the power assembly by transmission, and the blade pulley 42 is driven by the power assembly to move and drives the blade 5 to move; the blade 5 is also provided with a parallel shaft 52 below the power shaft 51, and the ends of the parallel shaft 52 are provided with There are parallel wheels 22 compatible with U-shaped rails. The parallel wheels 22 can be directly replaced by bearings. The parallel wheels 22 on the same side of all blades 5 are inserted into the same U-shaped rail, and the parallel wheels 22 can be placed in the U-shaped rail. Sliding, each parallel shaft 52 is restricted to be in the same position in the direction perpendicular to the extension direction of the frame 4 through the U-shaped rail, so that the blades can be turned over synchronously.

As a preferred embodiment, the frame 4 is provided with a sliding area, the sliding area is provided with the slide rail 41, and the leaf block 42 is provided with translation pulleys matching the slide rail 41; The frame 4 is provided with a transmission area on one side of the sliding area. A chain rubber sleeve 43 is fixedly installed in the transmission area. The chain rubber sleeve 43 can be made of smooth nylon, which can ensure the smooth and quiet movement of the closed-loop chain 44. The chain rubber sleeve 43 is provided with a chain groove, and a part of the closed-loop chain 44 is arranged in the chain groove. The closed-loop chain 44 starts from one end of the frame 4, stretches out from the other end of the chain groove after passing through the chain groove and winds around the frame 4, and then go back to the starting point to form a closed loop after passing through the upper surface of the frame 4. The upper surface of the frame 4 can also be provided with a chain cover made of smooth nylon to improve the mute performance; both ends of the frame 4 are provided with a closed loop The reversing gear 45 meshed with the chain 44, one of the reversing gears 45 is connected to the driving motor, the driving motor can be a double-headed motor and placed in the horizontal profile on one side, and the two output ends of the driving motor extend respectively On one of the reversing gears 45 of the two frames 4, the drive force is provided synchronously to the two frames 4, and the two closed-loop chains 44 are synchronously driven to rotate; one of the leaf pulleys 42 located at the farthest end is fixedly connected to the closed-loop chain 44 One of them is used as the driving block 42a, and the remaining leaf blocks 42 are passive blocks. One end provided with the active block 42a is the starting end, and the other end is the end. All leaf blocks 42 are connected with steel cables 46 each other. The steel cable 46 at the end is fixedly connected to the frame 4, drives the active block 42a to move through the driving motor and pulls the passive block sequentially with the steel cable 46; For example, the outer ring of the bearing as the parallel wheel 22 is fixedly connected to the U-shaped rail, and the inner ring is connected to the parallel shaft 52. At the same time, as shown in Figure 10, the parallel wheel 22 at the starting end moves to U when the passive block at the end is pulled The edge end of the starting end of the shaped rail, that is, the length of the U-shaped rail matches the maximum stroke of the parallel wheel 22 of the blade 5 corresponding to the active block 42a. Wheel 22 comes to the limit end of U-shaped rail, and the continuation of running of driving block 42a will drive U-shaped rail to move by parallel wheel 22.

The operating process of the louver structure provided in this embodiment is as follows. When the blades 5 are in a stacked state (that is, all the blades are turned down and stacked close to one side of the window opening), the other side of the window opening is fully opened, allowing for ventilation and enjoyment. Sunlight. When it needs to be closed, start the driving motor, and the driving motor drives the closed-loop chain 44 to rotate, and the driving block 42a follows and moves and drives the first blade 5 to move. When the steel cable 46 between a blade 5 and the second blade 5 was tensioned, the driving block 42a continued to move and would drive the second blade 5 to move simultaneously. In the same way, when the driving block 42a continues to move, all the blades 5 will be gradually pulled apart due to the action of the steel cable 46, forming the effect of shutters. At this time, the drive motor can be selected to be turned off.

If the driving motor continues to run, it will drive the driving block 42a to continue moving. At this moment, all blades 5 will have a tendency to continue moving forward. The rail is fixed, that is, the continued movement of the active block 42a will pull the U-shaped rail to slide along the inclined rail 1 through the blade 5, and the sliding of the U-shaped rail will lift the lower part of the blade 5 upwards to realize the effect of flipping and closing the blade 5. At this time, due to the last One end of a section of steel cable 46 is fixedly connected to the frame material profile or the frame 4, so that the blade 5 will not move excessively with inertia and affect the use effect.

In the same way, when it needs to be opened, drive the driving block 42a to move in reverse, and the blade 5 swings downward under the action of its own gravity and the thrust of the driving block 42a, so as to realize the effect of flipping and opening to form a louver. If further open, then continue to drive driving block 42a to move, make driving block 42a push all leaf blocks 42 to move successively, and drive blade 5 to stack to one side, realize the effect that stacking is opened.

The above-mentioned embodiments only express several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but should not be construed as limiting the patent scope of the present invention. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims

A louver flip linkage structure, characterized in that it includes a ramp (1) fixedly installed on the frame (4) of the louver and inclined relative to the extension direction of the frame (4), and a sliding track (1) is installed on the ramp (1) Simultaneously, the limiting structure (2) is connected with all the blades (5) of the louvers in a synchronous limiting connection in the direction perpendicular to the extension of the frame (4).
The louver flip linkage structure according to claim 1, characterized in that, when the blades (5) flip, the limiting structure (2) advances with at least one of the blades (5) on the blade (5) direction to form a limit connection.
The louver turning linkage structure according to claim 2, characterized in that, the limiting structure (2) is a sliding rod or a U-shaped rail, and the blade (5) slides through the rod sleeve (21) Connected to the sliding rod or slidingly connected to the U-shaped rail through parallel wheels (22); said sliding rod or U-shaped rail is then slidingly connected to the inclined rail (1) through the lifting block (3).
According to claim 3, a louver turning linkage structure, characterized in that, the lifting trolley (3) includes a mounting base plate (31) that is rotated and mounted to both ends of the slide bar or the back of the U-shaped rail, and the mounting base plate ( 31) There are at least three lifting pulleys (32) installed on the upper rotation, and all lifting pulleys (32) are divided into two groups, and the two groups of lifting pulleys (32) are mutually misplaced and installed; the inclined rail (1) includes a track seat ( 11), one side of the track seat (11) is provided with a rail groove, and a steel rail (12) is fixedly installed on the side walls of both sides of the rail groove, and the diameter of the lifting pulley (32) is smaller than that of the rail groove The two sets of lifting pulleys (32) are slidingly connected to the two steel rails (12) respectively, and at least one lifting pulley (32) in the two sets of lifting pulleys (32) is arranged alternately in two groups.
The louver turning linkage structure according to claim 3, characterized in that, the lifting trolley (3) includes a trolley seat (34) that is rotatably installed on both ends of the slide bar or on the back of the U-shaped rail, and the trolley seat ( 34) There is a pulley cavity inside, and a number of lifting pulleys (32) are installed on both sides of the pulley cavity, and there is a space between the lifting pulleys (32) on both sides to match the width of the inclined rail (1); Both sides of the inclined rail (1) are provided with a steel rail (12) slidingly matched with the lifting pulley (32).
A louver structure, characterized in that it is equipped with the louver turning linkage structure according to any one of claims 1-5.
A louver structure according to claim 6, characterized in that it comprises a frame (4), on which a slide rail (41) is arranged along the extending direction of the frame (4), and the slide rail (41) rotates There are several blades (5) installed, the blades (5) are connected to the power assembly and driven by the power assembly to slide and installed on the slide rail (41), and the frame (4) is on the side of the slide rail (41) The inclined rail (1) is fixedly installed at the position, and the blade (5) is connected to the limiting structure (2) for sliding and synchronously limiting in a direction perpendicular to the extending direction of the frame (4).
A louver structure according to claim 7, characterized in that, a number of leaf pulleys (42) are provided on the slide rail (41) corresponding to the blades (5) one by one; the blades (5) ) is provided with a power shaft (51), and the power shaft (51) is connected to the leaf block (42) after rotation, and the leaf block (42) is connected to the power assembly by transmission; the blade (5) is also provided with a parallel shaft (52), one side of the parallel shafts (52) of all blades (5) is slidingly connected to the same limiting structure (2), and the limiting structure (2) limits each parallel shaft (52) ) are in the same position perpendicular to the extension direction of the frame (4).
The louver structure according to claim 8, characterized in that, the limiting structure (2) is a U-shaped rail with a "U"-shaped cross-section, and the two ends of the U-shaped rail are sealed, and the parallel The end of the shaft (52) is provided with a parallel wheel (22) matching the U-shaped rail, and the parallel wheels (22) on the same side of all the blades (5) are inserted into the same U-shaped rail, and the parallel wheel (22) ) can slide in the U-shaped rail.
The louver structure according to claim 9, characterized in that, a sliding area is provided in the frame (4), and a plurality of sliding rails (41) are arranged in the sliding area, and the leaf block (42) is A translation pulley matching the slide rail (41) is provided; the frame (4) is provided with a transmission area on one side of the sliding area, and a chain rubber sleeve (43) is fixedly installed in the transmission area, and the chain rubber The sleeve (43) is provided with a chain groove, and a part of the closed-loop chain (44) is arranged in the chain groove. The closed-loop chain (44) starts from one end of the frame (4), and passes through the chain groove from the other end of the chain groove. Stretch out and go around to the upper surface of the frame (4), and then return to the starting point after passing through the upper surface of the frame (4) to form a closed loop; both ends of the frame (4) are provided with reversing gears that engage with the closed-loop chain (44) gear (45), wherein a reversing gear (45) transmission is connected to the drive motor; one of the leaf blocks (42) located at the extreme end is fixedly connected to one of the closed-loop chains (44) and acts as a driving block (42a), The rest of the leaf tackles (42) are passive tackles, the end provided with the active tackle (42a) is the starting end, and the other end is the end, and all the leaf tackles (42) are connected with steel cables (46) between each other, and the most edge end of the end is The steel cable (46) is fixedly connected to the frame (4), drives the active block (42a) to move through the driving motor and cooperates with the steel cable (46) to pull the passive block in sequence; the parallel shaft (52a) of the most end blade (5) ) non-slidable rotating connection to the U-shaped rail, or the parallel wheel (22) at the starting end moves to the extreme end of the starting end of the U-shaped rail when the passive block at the end is pulled, or the blade (5) at the end The parallel shaft (52) is non-slidably rotatably connected to the U-shaped rail and the parallel wheel (22) at the starting end moves to the extreme end of the starting end of the U-shaped rail when the most end passive tackle is pulled.