A novel double-film covering device for multi-span greenhouses

Abstract

This invention discloses a novel double-film covering device for multi-span greenhouses, relating to the field of double-film covering technology for multi-span greenhouses. It includes three greenhouse structures, each with a covering structure on its inner wall. The covering structure includes two connecting plates, both sides of which are fixedly connected to the greenhouse structure. A motor is fixedly connected to the upper surface of each connecting plate, and a winding rod is fixedly connected to the output end of the motor. A rope is wound around the arc surface of the winding rod. Two strips are fixedly connected to the side of the two connecting plates closest to each other. A sliding frame is slidably connected to the surface of each strip, and both sides of the sliding frame are fixedly connected to two ropes. A double-film body is slidably connected to one side of the sliding frame. This invention achieves the effect of conveniently covering the double-film body inside the greenhouse, solving the problems of increased labor intensity due to the need for personnel to walk around inside the greenhouse to cover the double-film body, and the tendency of conventional double-film covering to cause shading.

Description

Technical Field

[0001] This invention relates to the field of double-layer film covering technology for multi-span greenhouses, specifically a novel double-layer film covering device for multi-span greenhouses. Background Technology

[0002] A multi-span greenhouse is generally constructed with load-bearing poles and cement pillars, with an arched top covered by a plastic film. When growing vegetables in weather with large temperature differences, it is necessary to cover the multi-span greenhouse with another layer of film, also known as a double film, to further maintain the temperature of the multi-span greenhouse, which can generally lock in the temperature by five to six degrees.

[0003] Regarding the aforementioned and existing related technologies, the inventors believe that the following defects often exist: When covering the double-layer film, personnel typically pull the film from one side of the multi-span plastic greenhouse to the other before securing it. During this process, multi-span plastic greenhouses are generally large, and personnel expend considerable effort pulling the film. Furthermore, it is necessary to walk inside the multi-span plastic greenhouse to confirm the film coverage deviation, thus increasing the time and steps required for the double-layer film covering operation. In addition, existing double-layer film covering technologies generally use a roll-up method from both sides of the greenhouse. When the film is rolled up, it can cause large-area shading inside the greenhouse.

[0004] Therefore, we propose a novel double-film covering device for multi-span greenhouses. Summary of the Invention

[0005] The purpose of this invention is to provide a novel double-film covering device for multi-span greenhouses to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a novel double-film covering device for a multi-span greenhouse, comprising three greenhouse bodies. The inner walls of each greenhouse body are provided with a covering structure, which includes two connecting plates. Both sides of the two connecting plates are fixedly connected to the greenhouse bodies. A motor is fixedly connected to the upper surface of each connecting plate, and a winding rod is fixedly connected to the output end of the motor. A rope is wound around the arc surface of the winding rod. Two strips are fixedly connected to the side of the two connecting plates that are close to each other. A sliding frame is slidably connected to the surface of each strip. Both sides of the sliding frame are fixedly connected to two ropes. A double-film body is slidably connected to one side of the sliding frame, and the other side of the double-film body is slidably connected to the connecting plate. Sliding rods are fixedly connected to both sides of each greenhouse body. Several circular rings are slidably connected to the arc surface of each sliding rod. Skirt films are slidably connected to both sides of each greenhouse body. A circular hole is opened on one side of the skirt film relative to the position of the circular rings, and the inner wall of the circular hole is slidably connected to the circular ring.

[0007] The aforementioned components achieve the following effect: they facilitate the covering of the secondary membrane body inside the shed, thereby minimizing the need for personnel to walk around inside the shed to cover the secondary membrane body, which increases labor intensity, and avoids problems such as shading that can easily occur with conventional secondary membrane covering.

[0008] Preferably, the arc surface of the winding rod is fixedly connected to two side plates, and the side of the two side plates that are close to each other is slidably connected to the rope.

[0009] The effect achieved by the above components is that the rope slides and wraps around the arc surface of the winding rod between the two side plates, and the side plates prevent the rope from detaching from the winding rod when it is wrapped.

[0010] Preferably, the surface of the sliding frame has two inner grooves, and the inner wall of the inner groove is rotatably connected to a pulley, the arc surface of the pulley being slidably connected to the strip.

[0011] The effect achieved by the above components is that the movement of the sliding frame causes the pulley to slide from the upper surface of the strip, thereby reducing the friction between the sliding frame and the strip.

[0012] Preferably, a bottom frame is fixedly connected to one side of the two connecting plates that are close to each other, and the surface of the two membrane bodies is slidably connected to the bottom frame.

[0013] The effect achieved by the above components is that the second membrane body slides from the upper surface of the bottom frame through the sliding frame, and the bottom frame serves to temporarily support the second membrane body to reduce the placement space.

[0014] Preferably, one side of the connecting plate is provided with a disassembly structure, the disassembly structure including a base plate, one side of the base plate is fixedly connected to the connecting plate, the upper surface of the base plate abuts against the second membrane body, a drive rod is threaded through the upper surface of the strip, the lower ends of the two drive rods are rotatably connected to a pressure plate, the pressure plate is located above the second membrane body, a plurality of hooks are evenly fixedly connected to the lower surface of the sliding frame, the surface of the hooks is fixedly connected with a perforation, and the upper surface of the second membrane body is provided with perforations at positions relative to the plurality of hooks, the surfaces of the hooks and the perforations are slidably connected to the inner wall of the perforations.

[0015] The aforementioned components achieve the following effects: they allow for the disassembly and replacement of the second membrane body, enabling it to be replaced individually after prolonged use, thereby significantly reducing the operating cost of the device and improving its mobility. Furthermore, the perforations facilitate quick and easy insertion of hooks into the holes.

[0016] Preferably, a plurality of spikes are uniformly fixedly connected to the lower surface of the pressure plate, and one side of the spikes abuts against the second membrane body.

[0017] The effect achieved by the above components is that the pressure plate drives the spikes to fit and squeeze against the second membrane body, and the spikes further limit the position of the second membrane body.

[0018] Preferably, each of the hooks has a spike fixedly connected to its upper end, and a reinforcing rod is fixedly connected to one side of the two membrane bodies.

[0019] The effect achieved by the above-mentioned components is to increase the hardness of one side of the second membrane body and prevent bending by means of the reinforcing rod.

[0020] Preferably, each of the two connecting plates has a wire structure on one side close to each other. The wire structure includes a telescopic rod, one side of which is fixedly connected to the connecting plate. A connecting rod is fixedly connected to the output end of the telescopic rod. A U-shaped plate is fixedly connected to the upper surface of the connecting rod. The arc surface of the wire is slidably connected to the inner wall of the U-shaped plate.

[0021] The aforementioned components achieve the following effect: they act as auxiliary guides for the rope, thereby minimizing the need for multiple swings by personnel when the rope cannot be moved to the edge during winding. This not only improves the winding quality of the rope but also greatly enhances the practicality of the device.

[0022] Preferably, a cover plate is slidably connected to the upper surface of the U-shaped plate, a screw is threaded through the upper surface of the cover plate, a frame is fixedly connected to one side of the U-shaped plate, and the arc surface of the screw is slidably connected to the inner wall of the frame.

[0023] The effect achieved by the above components is that rotating the screw causes the cover plate to insert into the inner wall of the card frame, and the cover plate prevents the rope from detaching from the inner wall of the U-shaped plate.

[0024] Preferably, a clamping plate is fixedly connected to one side of the cover plate, and one side of the clamping plate is threadedly connected to the U-shaped plate.

[0025] The effect achieved by the above components is that after the cover plate and the U-shaped plate are attached, the clamping plate is also attached to the U-shaped plate, and the clamping plate prevents the cover plate from rotating due to the limit of the screw.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] 1. This invention, through its covering structure, achieves the effect of conveniently covering the secondary film body inside the greenhouse. The secondary film body can be covered and rolled up using two motors for unwinding and rewinding, which not only reduces the labor intensity of manual covering but also improves the automation level of the device, thereby shortening the overall covering time. This eliminates the need for personnel to repeatedly move around to cover the secondary film body, effectively reducing the number of operational steps. Furthermore, the overall structure of the device is simple, facilitating quick operation. Secondary film covering is a commonly used insulation method for overwintering cultivation in low-temperature seasons in multi-span greenhouses. Covering with the secondary film body can significantly increase the temperature inside the greenhouse, increase crop rotation, promote earlier maturity, and increase yield and economic benefits.

[0028] 2. By setting up a disassembly structure, the present invention achieves the effect of disassembling and replacing the second membrane body, so that the second membrane body can be replaced separately after long-term use, thereby greatly reducing the use cost of the device and improving the mobility of the device. In addition, the perforation allows personnel to quickly insert the hook into the perforation.

[0029] 3. By setting up a guide wire structure, this invention achieves the effect of assisting the guide wire for the rope, thereby minimizing the need for multiple swings by personnel when the rope cannot be moved to the edge position during winding. This not only improves the winding quality of the rope but also greatly enhances the practicality of the device. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0031] Figure 2 This is a partial structural diagram of the present invention.

[0032] Figure 3 For the present invention Figure 1 A schematic diagram of a partial structure;

[0033] Figure 4 For the present invention Figure 3 A schematic diagram of a partial structure;

[0034] Figure 5 This is a partial structural diagram of the winding rod of the covering structure of the present invention;

[0035] Figure 6 This is a partial structural diagram of the bottom frame of the covering structure of the present invention;

[0036] Figure 7 This is a partial structural diagram of the screw section of the conductor structure of the present invention;

[0037] Figure 8 This is a partial structural diagram of the spikes in the disassembly structure of the present invention;

[0038] Figure 9This is a partial structural diagram of the hook part of the disassembly structure of the present invention;

[0039] Figure 10 This is a partial structural diagram of the perforation point in the disassembly structure of the present invention;

[0040] Figure 11 This is a partial structural schematic diagram of the cover structure slide bar of the present invention;

[0041] Figure 12 This is a partial structural schematic diagram of the covering structure skirt membrane of the present invention.

[0042] In the diagram: 1-Shelter body; 2-Covering structure; 201-Connecting plate; 202-Motor; 203-Winding rod; 204-Rope; 205-Strip plate; 206-Sliding frame; 207-Side plate; 208-Inner groove; 209-Pulley; 210-Bottom frame; 211-Second membrane body; 212-Sliding rod; 213-Ring; 214-Round hole; 215-Skirt membrane; 3-Disassembly structure; 31-Bottom plate; 32-Drive rod; 33-Pressure plate; 34-Hook; 35-Perforation; 36-Spike; 37-Prickle; 38-Reinforcing rod; 4-Wire structure; 41-Telescopic rod; 42-Connecting rod; 43-U-shaped plate; 44-Cover plate; 45-Screw; 46-Frame; 47-Frame. Detailed Implementation

[0043] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] Please see Figures 1-3This invention provides a technical solution: a novel double-film covering device for a multi-span greenhouse, comprising three greenhouse bodies 1, connecting plates 201, ropes 204, and double-film bodies 211. The inner wall of each greenhouse body 1 is provided with a covering structure 2, which facilitates the covering of the double-film bodies 211 inside the greenhouse body 1. This minimizes the need for personnel to walk around inside the greenhouse body 1 to cover the double-film bodies 211, thus reducing labor intensity and avoiding the problems of shading caused by conventional double-film covering. One side of the connecting plate 201 is provided with a disassembly structure 3, which allows for the disassembly and replacement of the double-film bodies 211. This enables the double-film bodies 211 to be replaced individually after long-term use, thereby greatly reducing the operating cost of the device and improving its mobility. The two connecting plates 201 are each provided with a guide wire structure 4 on the side closest to each other, which serves as an auxiliary guide for the ropes 204. This minimizes the need for personnel to swing the ropes 204 multiple times when they cannot be moved to the edge during winding, improving the winding quality of the ropes 204 and greatly enhancing the practicality of the device.

[0045] The following section will explain the specific setup and function of its covering structure 2, disassembly structure 3, and wire structure 4.

[0046] like Figures 2-12 As shown, both sides of the two connecting plates 201 are fixedly connected to the shed body 1. A motor 202 is fixedly connected to the upper surface of the connecting plate 201. A winding rod 203 is fixedly connected to the output end of the motor 202. The arc surface of the rope 204 is wound and connected to the winding rod 203. Two strips 205 are fixedly connected to the side of the two connecting plates 201 that are close to each other. A sliding frame 206 is slidably connected to the surface of the strips 205. Both sides of the sliding frame 206 are fixedly connected to the two ropes 204. One side of the membrane body 211 is slidably connected to the sliding frame 206, and the other side of the membrane body 211 is slidably connected to the connecting plate 201. Both sides of the shed body 1 are fixedly connected to the connecting plate 201. A sliding rod 212 is connected, and several circular rings 213 are slidably connected to the arc surface of the sliding rod 212. Skirt membranes 215 are slidably connected to both sides of the shed body 1. Circular holes 214 are opened on one side of the skirt membrane 215 at the position of several circular rings 213. The inner wall of the circular hole 214 is slidably connected to the circular ring 213. Two side plates 207 are fixedly connected to the arc surface of the winding rod 203. The side of the two side plates 207 that are close to each other are slidably connected to the rope 204. The rope 204 slides and winds around the arc surface of the winding rod 203 between the two side plates 207. The side plates 207 play the role of preventing the rope 204 from detaching from the winding rod 203 when it is wound.

[0047] Two inner grooves 208 are formed on the surface of the sliding frame 206. A pulley 209 is rotatably connected to the inner wall of the inner groove 208. The arc surface of the pulley 209 is slidably connected to the strip 205. The movement of the sliding frame 206 causes the pulley 209 to slide from the upper surface of the strip 205. The pulley 209 reduces the friction between the sliding frame 206 and the strip 205. A bottom frame 210 is fixedly connected to one side of the two connecting plates 201 that are close to each other. The surface of the second membrane body 211 is slidably connected to the bottom frame 210. The second membrane body 211 slides from the upper surface of the bottom frame 210 through the sliding frame 206. The bottom frame 210 serves to temporarily support the second membrane body 211 and reduce the placement space.

[0048] like Figure 8 and Figure 9 as well as Figure 10 As shown, the disassembly structure 3 includes a base plate 31, one side of which is fixedly connected to a connecting plate 201. The upper surface of the base plate 31 abuts against the second membrane body 211. A drive rod 32 is threaded through the upper surface of the strip plate 205. A pressure plate 33 is rotatably connected to the lower ends of the two drive rods 32. The pressure plate 33 is located above the second membrane body 211. Several hooks 34 are evenly fixedly connected to the lower surface of the slide frame 206. The surface of the hooks 34 is fixedly connected with perforations 37. Perforations 35 are opened on the upper surface of the second membrane body 211 at positions corresponding to the hooks 34. The surfaces of hooks 34 and piercings 37 are slidably connected to the inner wall of perforations 35. Several spikes 36 are evenly fixedly connected to the lower surface of pressure plate 33. One side of the spikes 36 abuts against the second membrane body 211. Pressure plate 33 drives spikes 36 to fit and press against the second membrane body 211. The spikes 36 further limit the second membrane body 211. The upper ends of several hooks 34 are fixedly connected to spikes 36. A reinforcing rod 38 is fixedly connected to one side of the second membrane body 211. The reinforcing rod 38 is used to increase the hardness of one side of the second membrane body 211 to prevent bending.

[0049] like Figure 5 and Figure 7As shown, the conductor structure 4 includes a telescopic rod 41, one side of which is fixedly connected to a connecting plate 201. A connecting rod 42 is fixedly connected to the output end of the telescopic rod 41. A U-shaped plate 43 is fixedly connected to the upper surface of the connecting rod 42. The arc surface of the wire 204 is slidably connected to the inner wall of the U-shaped plate 43. A cover plate 44 is slidably connected to the upper surface of the U-shaped plate 43. A screw 45 is threaded through the upper surface of the cover plate 44. A retaining frame 46 is fixedly connected to one side of the U-shaped plate 43. The arc surface of 5 slides in connection with the inner wall of the frame 46. Rotating the screw 45 causes the cover plate 44 to be inserted into the inner wall of the frame 46. The cover plate 44 prevents the rope 204 from detaching from the inner wall of the U-shaped plate 43. A card plate 47 is fixedly connected to one side of the cover plate 44. One side of the card plate 47 is threadedly connected to the U-shaped plate 43. After the cover plate 44 and the U-shaped plate 43 are in contact, the card plate 47 is in contact with the U-shaped plate 43. The card plate 47 achieves the effect of preventing the cover plate 44 from rotating due to the limitation of the screw 45.

[0050] Working principle: When it is necessary to cover the double membrane body 211 inside the shed 1, the double membrane body 211 is first connected to the sliding frame 206 and the connecting plate 201 through the disassembly structure 3. After the connection is completed, the motor 202 is started. The output end of the motor 202 drives the winding rod 203 to rotate, so that the rope 204 rotates on one side of the side plate 207 and pulls the sliding frame 206. The side plate 207 plays a role in preventing the rope 204 from detaching from the winding rod 203 when it is tangled. Then, the wire structure 4 guides and winds the rope 204. The sliding frame 206 drives the double membrane body 211 to slide from the upper surface of the bottom frame 210 through the movement of the rope. The bottom frame 210 plays a role in temporarily supporting the double membrane body 211 and reducing the placement space. The pulley 209 slides from the upper surface of the strip plate 205 through the sliding frame 206, and the pulley 209 achieves the function of lowering. The friction between the low sliding frame 206 and the strip 205 causes the second film body 211 to be unfolded by the movement of the sliding frame 206. After the sliding frame 206 moves to a suitable position on one side of the greenhouse 1, the motor 202 is turned off. At this time, the unfolded second film body 211 covers the inside of the greenhouse 1. When the temperature is low, the second film body 211 is unfolded. When the temperature rises and the sunlight increases in the morning, the sliding frame 206 drives the second film body 211 to roll up, so that the crops can receive sunlight and increase the temperature inside the greenhouse 1. The skirt films 215 on both sides of the greenhouse 1 can be moved according to the temperature. The circular holes 214 allow the rings 213 to slide on the arc surface of the sliding rod 212, so that the skirt films 215 can be rolled up or unfolded. This can protect the crops from low temperature damage and avoid the second film body 211 from blocking sunlight and causing the adverse effect of shadows.

[0051] When it is necessary to install and connect the second membrane body 211 with the slide frame 206 and the connecting plate 201, first place one side of the second membrane body 211 on the upper surface of the base plate 31. Then, rotate the drive rod 32 towards the side closer to the pressure plate 33 through the strip plate 205. The pressure plate 33 drives the spikes 36 to press against the second membrane body 211 through the drive rod 32. The spikes 36 further limit the second membrane body 211. At this time, one side of the second membrane body 211 is pressed against the base plate 31 by the spikes 36 and cannot move. Then, move the reinforcing rod 38 to move the second membrane body 211 towards the side closer to the slide frame 206. With the help of the reinforcing rod 38, the hardness of one side of the second membrane body 211 is increased to prevent bending. Finally, move the second membrane body 211 so that the perforation 35 is fitted onto the surface of the hook 34 with the help of the piercing 37, thus completing the installation of the second membrane body 211.

[0052] When it is necessary to guide the wound rope 204, first activate the telescopic rod 41. The output end of the telescopic rod 41 drives the connecting rod 42 to move horizontally. The U-shaped plate 43 drives the wound rope 204 to move horizontally through the connecting rod 42. Through the continuous extension and retraction of the telescopic rod 41, the rope 204 can be wound and wound at a uniform speed on the arc surface of the winding rod 203. When it is necessary to replace the rope 204, rotate the screw 45 away from the clamping frame 46. The screw 45 disengages from the inner wall of the clamping frame 46 through the cover plate 44. Finally, move the cover plate 44 to disengage from the U-shaped plate 43. The cover plate 44 prevents the rope 204 from disengaging from the inner wall of the U-shaped plate 43. The clamping plate 47 disengages from one side of the U-shaped plate 43 through the cover plate 44. The clamping plate 47 prevents the cover plate 44 from rotating due to the limitation of the screw 45. At this time, the top of the U-shaped plate 43 is exposed, and the rope 204 inside the U-shaped plate 43 can be removed for replacement.

[0053] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0054] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A novel double-film covering device for a multi-span greenhouse, comprising three greenhouse structures (1), characterized in that: The inner wall of the shed (1) is provided with a covering structure (2), which includes two connecting plates (201). Both sides of the two connecting plates (201) are fixedly connected to the shed (1). A motor (202) is fixedly connected to the upper surface of the connecting plate (201). A winding rod (203) is fixedly connected to the output end of the motor (202). A rope (204) is wound around the arc surface of the winding rod (203). Two strips (205) are fixedly connected to the side of the two connecting plates (201) that are close to each other. A sliding frame (206) is slidably connected to the surface of the strips (205). Both sides of the frame (206) are fixedly connected to two ropes (204). One side of the sliding frame (206) is slidably connected to a two-membrane body (211). The other side of the two-membrane body (211) is slidably connected to a connecting plate (201). Both sides of the shed (1) are fixedly connected to sliding rods (212). Several circular rings (213) are slidably connected to the arc surface of the sliding rods (212). Both sides of the shed (1) are slidably connected to skirt membranes (215). A circular hole (214) is opened on one side of the skirt membrane (215) relative to the position of several circular rings (213). The inner wall of the circular hole (214) is slidably connected to the circular ring (213).

2. The novel double-film covering device for a multi-span greenhouse according to claim 1, characterized in that: The arc surface of the winding rod (203) is fixedly connected to two side plates (207), and the two side plates (207) that are close to each other are slidably connected to the rope (204).

3. The novel double-film covering device for a multi-span greenhouse according to claim 1, characterized in that: The surface of the sliding frame (206) has two inner grooves (208), and the inner wall of the inner groove (208) is rotatably connected to a pulley (209). The arc surface of the pulley (209) is slidably connected to the strip (205).

4. The novel double-film covering device for a multi-span greenhouse according to claim 1, characterized in that: The two connecting plates (201) are fixedly connected to a bottom frame (210) on the side close to each other, and the surface of the two membrane bodies (211) is slidably connected to the bottom frame (210).

5. A novel double-film covering device for a multi-span greenhouse according to claim 1, characterized in that: The connecting plate (201) has a disassembly structure (3) on one side. The disassembly structure (3) includes a base plate (31). One side of the base plate (31) is fixedly connected to the connecting plate (201). The upper surface of the base plate (31) abuts against the second membrane body (211). The upper surface of the strip plate (205) is threaded with a drive rod (32). The lower ends of the two drive rods (32) are rotatably connected to a pressure plate (33). The pressure plate (33) is located above the second membrane body (211). The lower surface of the sliding frame (206) is uniformly fixedly connected with several hooks (34). The surface of the hooks (34) is fixedly connected with a perforation (37). The upper surface of the second membrane body (211) is provided with perforations (35) at positions relative to the several hooks (34). The surfaces of the hooks (34) and the perforations (37) are slidably connected to the inner wall of the perforations (35).

6. A novel double-film covering device for a multi-span greenhouse according to claim 5, characterized in that: The lower surface of the pressure plate (33) is uniformly fixed with a number of spikes (36), one side of which abuts against the second membrane body (211).

7. A novel double-film covering device for a multi-span greenhouse according to claim 5, characterized in that: Each of the hooks (34) has a spike (36) fixedly connected to its upper end, and a reinforcing rod (38) is fixedly connected to one side of the two-membrane body (211).

8. A novel double-film covering device for a multi-span greenhouse according to claim 1, characterized in that: Both connecting plates (201) are provided with a wire structure (4) on the side close to each other. The wire structure (4) includes a telescopic rod (41). One side of the telescopic rod (41) is fixedly connected to the connecting plate (201). A connecting rod (42) is fixedly connected to the output end of the telescopic rod (41). A U-shaped plate (43) is fixedly connected to the upper surface of the connecting rod (42). The arc surface of the rope (204) is slidably connected to the inner wall of the U-shaped plate (43).

9. A novel double-film covering device for a multi-span greenhouse according to claim 8, characterized in that: A cover plate (44) is slidably connected to the upper surface of the U-shaped plate (43), and a screw (45) is threaded through the upper surface of the cover plate (44). A frame (46) is fixedly connected to one side of the U-shaped plate (43), and the arc surface of the screw (45) is slidably connected to the inner wall of the frame (46).

10. A novel double-film covering device for a multi-span greenhouse according to claim 9, characterized in that: A clamping plate (47) is fixedly connected to one side of the cover plate (44), and one side of the clamping plate (47) is threadedly connected to the U-shaped plate (43).

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