A seedling raising device for rice cultivation

Abstract

This invention discloses a seedling raising device for rice cultivation, relating to the field of rice cultivation technology. It includes a support frame with seedling boards fixedly connected at equal intervals on the frame, and a seedling film on the seedling boards. It also includes a flexible film-winding drive mechanism and a positional adjustment mechanism. A drive motor drives the film-winding roller to rotate forward and backward to achieve unwinding and film covering, and rewinding and film removal. The connecting head slides within a moving groove and simultaneously compresses the first spring and the elastic telescopic sleeve to form an elastic energy storage structure. During film covering, the elastic element is compressed and stores energy, providing buffering damping during unwinding to ensure the film unfolds smoothly. During film removal, the elastic restoring force and the drive motor's winding force are superimposed in the same direction and automatically decrease with the stroke. Combined with the inner support roller's full-length rolling support and the elastic clamping of the film by the abutment plate, it achieves a fully automatic effect of controllable film covering and adaptive film removal force without damaging seedlings or tearing the film. This completely solves the problems of inaccurate alignment during manual film covering and uneven film removal force leading to seedling damage and film waste.

Description

Technical Field

[0001] This invention relates to the field of rice cultivation technology, specifically to a seedling raising device for rice cultivation. Background Technology

[0002] In the process of rice seedling cultivation, in order to create a greenhouse-like growing environment for the seedlings, seedling trays, seedling racks and other equipment are usually used, and a plastic film is covered on top to keep warm and moist, promote seed germination and seedling growth. After the seedlings grow to a certain height, the film needs to be removed to allow the seedlings to receive light and avoid excessive growth.

[0003] Currently, the mulching and unwrapping processes mostly rely on manual operation. During mulching, the film is laid flat on the seedling trays manually, and during unwrapping, the film is manually peeled off tray by tray. While some semi-automatic equipment can assist with mulching, the unwrapping process still requires manual completion, resulting in low overall automation and often the following problems: First, manual mulching is inefficient and prone to misalignment, causing wrinkles or misalignment of the film and affecting the uniformity of heat preservation. Second, manual unwrapping is labor-intensive and slow, and the timing is difficult to control uniformly; unwrapping too early can lead to seedling frost damage, while unwrapping too late can cause excessive seedling growth and decreased seedling quality. Third, uneven manual operation can easily tear the film or lift seedlings, causing seedling damage and wasting seedling trays, severely restricting the standardization and large-scale production of seedlings.

[0004] Therefore, in view of this, the present invention proposes a seedling raising device for rice cultivation to make up for and improve the deficiencies of the prior art. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a seedling raising device for rice cultivation, thereby resolving the corresponding technical issues raised in the background section.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a seedling raising device for rice planting, including a support frame, on which seedling raising boards are fixedly connected at equal intervals, and seedling raising films are provided on the seedling raising boards. It also includes: a flexible film winding mechanism and a position distance adaptation and adjustment mechanism, and the flexible film winding mechanism and the position distance adaptation and adjustment mechanism are both arranged between the seedling raising board and the seedling raising film. The flexible film winding mechanism includes a first base plate, a film winding roller, a second base plate, a connector, a first spring, and a traction film. The first base plate is symmetrically arranged on both sides of the seedling board. The film winding roller is arranged between the left ends of the first base plate. The second base plate is arranged above the first base plate. The connector is arranged at the left end of the first base plate. The first spring is arranged on the connector. The traction film is arranged between the seedling film and the connector. The position adjustment mechanism includes a sleeve, an electric push rod, and a top rod. The sleeve is symmetrically arranged on the first base plate, the electric push rod is disposed inside the sleeve, and the top rod is disposed between the second base plate and the electric push rod.

[0007] Preferably, the flexible film winding mechanism further includes a drive motor fixedly connected to the first base plate, the film winding roller is rotatably connected between the first base plates, and the film winding roller is fixedly connected to the output end of the drive motor. Inner support rollers are rotatably connected to the right end of the first base plate and both ends of the second base plate, and the inner support rollers are fitted onto the inner surface of the seedling film.

[0008] Preferably, the first base plate has a movable groove on each side facing each other, and the connectors are fixedly connected to movable blocks on the opposite side, with the movable blocks slidably connected to the movable grooves.

[0009] Preferably, a fixing head is fixedly connected to the right end of the first base plate on the opposite side, the first spring is fixedly connected between the fixing head and the connecting head, and an elastic telescopic sleeve is also fixedly connected between the fixing head and the connecting head, and the elastic telescopic sleeve is sleeved on the outside of the first spring.

[0010] Preferably, the left end of the seedling film is wound around the outer surface of the film-winding roller, the lead film is symmetrically and fixedly connected to the end of the seedling film away from the film-winding roller, and the end of the lead film away from the seedling film is fixedly connected to the connector.

[0011] Preferably, each of the left ends of the first base plate on opposite sides is fixedly connected to a bending plate, and a scraper is fixedly connected between the bending plates. The scraper is positioned above the film rolling roller and is in contact with the seedling film.

[0012] Preferably, mounting plates are fixedly connected at equal intervals to the inner walls on both sides of the support frame, and elastic telescopic columns are fixedly connected symmetrically to the mounting plates. A backing plate is fixedly connected to the end of the elastic telescopic columns away from the mounting plate. The seedling film is placed between the backing plate and the scraper, and the backing plate is in contact with the seedling film.

[0013] Preferably, the position adjustment mechanism further includes a second spring symmetrically fixedly connected between the first base plate and the second base plate, the sleeve is vertically fixedly connected to the first base plate, and the electric push rod is fixedly connected to the inner bottom wall of the sleeve.

[0014] Preferably, the inner walls of both sides of the sleeve are symmetrically provided with sliding grooves, and the top rod is symmetrically fixedly connected with sliders on both sides, and the sliders are slidably connected in the sliding grooves.

[0015] Preferably, the upper end of the push rod is fixedly connected to the second base plate, and the lower end of the push rod is fixedly connected to the electric push rod.

[0016] Compared with the prior art, the beneficial effects of the present invention are: (1) By using the flexible film winding drive mechanism, the drive motor drives the film winding roller to rotate in both directions to achieve unwinding and film covering, and unwinding and film removal. The connector slides in the moving groove and simultaneously squeezes the first spring and the elastic telescopic sleeve to form an elastic energy storage structure. During film covering, the elastic element is compressed and stored, providing buffer damping for the unwinding process so that the film unfolds smoothly. During film removal, the elastic recovery force and the winding force of the drive motor are superimposed in the same direction and automatically decrease with the stroke. With the support roller rolling support throughout the process and the elastic clamping of the film by the backing plate, the fully automatic effect of smooth and controllable film covering and adaptive film removal force without damaging the seedlings or tearing the film is achieved. This completely solves the problems of seedling damage and film waste caused by inaccurate alignment during manual film covering and uneven force during manual film removal.

[0017] (2) By setting up a positional distance adaptation and control mechanism, the electric push rod drives the top rod to drive the second base plate and inner support roller to rise and fall vertically. With the elastic balance of the second spring and the vertical guidance of the slider groove, the inner support roller presses down on the film to enhance the heat preservation and sealing when covering the film, and the inner support roller rises to avoid the seedlings when removing the film, creating space for the film to be removed. This achieves the effect of real-time adaptive adjustment of the distance between the film and the seedlings according to the actual height of the seedlings, and completely solves the problem that the fixed structure cannot adapt to different seedling heights, causing the film to damage the seedlings or the film to scrape the top of the seedlings when removing the film. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of a preferred embodiment of the present invention; Figure 2 This is a schematic diagram of the connection structure of the seedling film as shown in this invention; Figure 3 As shown in this invention Figure 2 Enlarged structural diagram at point A in the middle; Figure 4 This is a schematic diagram of the connection structure of the seedling board shown in this invention; Figure 5 As shown in this invention Figure 4 Enlarged structural diagram at point B; Figure 6 This is a schematic diagram of the structure of the abutment connection point shown in this invention.

[0019] The numbers on the map are: 1. Support frame; 2. Seedling tray; 3. Seedling film; 4. Flexible film winding drive mechanism; 401. First base plate; 402. Drive motor; 403. Film winding roller; 404. Second base plate; 405. Inner support roller; 406. Moving groove; 407. Connector; 408. Moving block; 409. First spring; 410. Elastic telescopic sleeve; 411. Leading film; 412. Mounting plate; 413. Elastic telescopic column; 414. Support plate; 415. Bending plate; 416. Scraper; 417. Fixed head; 5. Position distance adaptation and adjustment mechanism; 501. Sleeve; 502. Slide groove; 503. Electric push rod; 504. Push rod; 505. Slider; 506. Second spring. Detailed Implementation

[0020] 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.

[0021] Embodiment 1 of the present invention: Please refer to Figures 1 to 6 As shown, a seedling raising device for rice cultivation includes a support frame 1, on which seedling boards 2 are fixedly connected at equal intervals, and seedling film 3 is provided on the seedling boards 2. It also includes a flexible film winding mechanism 4 and a distance adaptation and control mechanism 5, and the flexible film winding mechanism 4 and the distance adaptation and control mechanism 5 are both provided between the seedling boards 2 and the seedling film 3. The flexible film winding mechanism 4 includes a first base plate 401, a film winding roller 403, a second base plate 404, a connector 407, a first spring 409, and a traction film 411. The first base plate 401 is symmetrically arranged on both sides of the seedling plate 2. The film winding roller 403 is arranged between the left ends of the first base plate 401. The second base plate 404 is arranged above the first base plate 401. The connector 407 is arranged at the left end of the first base plate 401. The first spring 409 is arranged on the connector 407. The traction film 411 is arranged between the seedling film 3 and the connector 407. The flexible film winding mechanism 4 also includes a drive motor 402 fixedly connected to the first base plate 401, a film winding roller 403 rotatably connected between the first base plates 401, and the film winding roller 403 is fixedly connected to the output end of the drive motor 402. The right end of the first base plate 401 and both ends of the second base plate 404 are rotatably connected to inner support rollers 405, and the inner support rollers 405 are attached to the inner surface of the seedling film 3. The first base plate 401 has a moving groove 406 on each side facing each other, and the connector 407 has a moving block 408 fixedly connected on the opposite side, and the moving block 408 is slidably connected to the moving groove 406. A fixing head 417 is fixedly connected to the right end of the first base plate 401 on the opposite side. A first spring 409 is fixedly connected between the fixing head 417 and the connecting head 407. An elastic telescopic sleeve 410 is also fixedly connected between the fixing head 417 and the connecting head 407, and the elastic telescopic sleeve 410 is sleeved on the outside of the first spring 409. The left end of the seedling film 3 is wound around the outer surface of the film rolling roller 403, and the traction film 411 is symmetrically and fixedly connected to the end of the seedling film 3 away from the film rolling roller 403, and the end of the traction film 411 away from the seedling film 3 is fixedly connected to the connector 407. The first base plate 401 is fixedly connected to the left end of the opposite side of each of the bending plates 415. The bending plates 415 are fixedly connected to each other and the scraper 416 is set above the film rolling roller 403 and is in contact with the seedling film 3. Mounting plates 412 are fixedly connected at equal intervals on both sides of the inner wall of the support frame 1. Elastic telescopic columns 413 are symmetrically fixedly connected on the mounting plates 412. A backing plate 414 is fixedly connected between the ends of the elastic telescopic columns 413 away from the mounting plates 412. The seedling film 3 is placed between the backing plate 414 and the scraper 416, and the backing plate 414 is in contact with the seedling film 3.

[0022] Please refer to Figures 1 to 6 Even better: the seedling film 3 is set above the seedling plate 2, the starting end of the seedling film 3 is already wound on the surface of the film rolling roller 403, the two ends of the leading film 411 are respectively connected between the end of the seedling film 3 away from the film rolling roller 403 and the connecting head 407, the first spring 409 is in a naturally extended state, the elastic telescopic sleeve 410 is sleeved on the outside of the first spring 409 and is simultaneously in its natural length, the connecting head 407 is located at the left end of the moving groove 406 under the drive of the moving block 408, the scraper 416 is in contact with the seedling film 3, and the abutment plate 414 pushes the seedling film 3 to be in contact with the scraper 416 and the abutment plate 414 under the elastic force of the elastic telescopic column 413.

[0023] The effects achieved by this embodiment are as follows: Compared with the prior art, the flexible film winding drive mechanism 4 is set up, and the drive motor 402 drives the film winding roller 403 to rotate in both directions to realize the unwinding and film covering and the winding and film unwinding. The connector 407 slides in the moving groove 406 and simultaneously squeezes the first spring 409 and the elastic telescopic sleeve 410 to form an elastic energy storage structure. During film covering, the elastic element is compressed and stored, and provides buffer damping for the unwinding process so that the film unfolds smoothly. During film unwinding, the elastic restoring force and the winding force of the drive motor 402 are superimposed in the same direction and automatically decrease with the stroke. With the inner support roller 405 rolling support throughout the entire process and the abutment plate 414 elastically clamping the film, the fully automatic effect of smooth and controllable film covering and adaptive film unwinding force without damaging the seedlings or tearing the film is achieved. It completely solves the problems of seedling damage and film waste caused by inaccurate alignment during manual film covering and uneven force during manual film unwinding.

[0024] Embodiment 2 of the present invention: Please refer to Figures 1 to 6 As shown, the position distance adaptation and adjustment mechanism 5 includes a sleeve 501, an electric push rod 503 and a top rod 504. The sleeve 501 is symmetrically arranged on the first base plate 401, the electric push rod 503 is arranged inside the sleeve 501, and the top rod 504 is arranged between the second base plate 404 and the electric push rod 503. The position distance adaptation and adjustment mechanism 5 also includes a second spring 506 symmetrically fixedly connected between the first base plate 401 and the second base plate 404, a sleeve 501 vertically fixedly connected to the first base plate 401, and an electric push rod 503 fixedly connected to the inner bottom wall of the sleeve 501. The inner walls of both sides of the sleeve 501 are symmetrically provided with sliding grooves 502, and the push rod 504 is symmetrically fixedly connected with sliders 505 on both sides, and the sliders 505 are slidably connected in the sliding grooves 502.

[0025] The upper end of the push rod 504 is fixedly connected to the second base plate 404, and the lower end of the push rod 504 is fixedly connected to the electric push rod 503.

[0026] Please refer to Figures 1 to 6 Even better: the sleeve 501 is symmetrically and fixedly connected to the first base plate 401, and is vertically and fixedly connected to the first base plate 401. Its position cannot be moved. The electric push rod 503 is fixed to the inner bottom wall of the sleeve 501 and is in a retracted state. The lower end of the push rod 504 is fixedly connected to the extended end of the electric push rod 503, and the upper end is fixedly connected to the second base plate 404. The sliders 505 on both sides of the push rod 504 are embedded in the grooves 502 on the inner wall of the sleeve 501. The sliders 505 are slidably connected to the grooves 502 to ensure that the push rod 504 can only move in the vertical direction. The second spring 506 is symmetrically and fixedly connected between the first base plate 401 and the second base plate 404 in a natural state. A film-winding roller 403 is rotatably arranged between the left ends of the first base plate 401, and an inner support roller 405 is rotatably arranged between the right ends of the first base plate 401. Two inner support rollers 405 are symmetrically rotatably arranged between the two ends of the second base plate 404. The inner support rollers 405 have the same structure, and the positions of the two upper inner support rollers 405, the lower film-winding roller 403, and the inner support rollers 405 correspond vertically to each other, forming a four-cornered... The cloth, since two of the inner support rollers 405 are set on the second base plate 404, and the seedling film 3 starts from the film rolling roller 403, passes through the two upper inner support rollers 405, then passes through the lower inner support roller 405, and is connected to the connector 407 through the lead film 411, and is slidably set on the first base plate 401. At this time, the height of the upper inner support roller 405 is determined by the position of the second base plate 404. That is, when covering the film, the distance between the seedling film 3 and the lead film 411 can be determined by the height of the second base plate 404.

[0027] The effects achieved by this embodiment are as follows: Compared with the prior art, by setting the positional distance adaptation and adjustment mechanism 5, the electric push rod 503 drives the top rod 504 to drive the second base plate 404 and the inner support roller 405 to rise and fall vertically. With the elastic balance of the second spring 506 and the vertical guidance of the slider 505 and the slide groove 502, the inner support roller 405 presses down on the film to enhance the heat preservation and sealing when covering the film, and the inner support roller 405 rises to avoid the seedlings and create space for the film to be removed when removing the film. This achieves the effect of real-time adaptive adjustment of the distance between the film and the seedlings according to the actual height of the seedlings, and completely solves the problem that the fixed structure cannot adapt to different seedling heights, resulting in the film covering damaging the seedlings or the film removing scraping the top of the seedlings.

[0028] The complete usage steps and working principle of the above embodiments are as follows: The following describes the working process of the flexible film winding mechanism 4 on the seedling film 3: The use of the equipment includes a film-coating stage and a film-uncoating stage. The film removal stage is as follows: Initial state: The seedling film 3 is placed above the seedling plate 2. The starting end of the seedling film 3 is already wound on the surface of the film rolling roller 403. The two ends of the lead film 411 are respectively connected between the end of the seedling film 3 away from the film rolling roller 403 and the connector 407. The first spring 409 is in a naturally extended state. The elastic telescopic sleeve 410 is sleeved on the outside of the first spring 409 and is simultaneously in its natural length. The connector 407 is located at the left end of the moving groove 406 under the drive of the moving block 408. The scraper 416 is in contact with the seedling film 3. The abutment 414 pushes the seedling film 3 to be in contact with the scraper 416 and the abutment 414 under the elastic force of the elastic telescopic column 413.

[0029] During the film removal process: the start-up of the drive motor 402 can drive the film-rolling roller 403 connected to its output end to rotate synchronously between the left ends of the two opposing first base plates 401. Since the starting end of the seedling film 3 is wound around the outer surface of the film-rolling roller 403, when the film-rolling roller 403 rotates, it can drive the seedling film 3 to roll up to the left synchronously. At this time, the lead film 411 symmetrically connected to the end of the seedling film 3 away from the film-rolling roller 403 will be pulled and moved by the rolling action of the film-rolling roller 403, and will move synchronously on the first base plate 401 in conjunction with the connecting head 407 set at the other end of the seedling film 3. It will move through the sliding cooperation of the moving block 408 and the moving groove 406. When the connecting head 407 moves, it will be synchronously squeezed by the first spring 409 and the elastic telescopic sleeve 410 set between it and the fixed head 417. In this embodiment, the first spring 409 is originally in its natural state. As the connector 407 moves to the right, the two ends of the first spring 409 are gradually brought closer together. The first spring 409 is gradually compressed from its natural length. During the compression process, the first spring 409 stores elastic potential energy inside and applies a leftward restoring force to the connector 407 (that is, the first spring 409 always has a tendency to return to its original length, thus generating a leftward thrust on the connector 407). The elastic telescopic sleeve 410 is fitted around the outside of the first spring 409, with one end fixed to the fixed head 417 and the other end fixed to the connecting head 407. As the connecting head 407 moves to the right, the elastic telescopic sleeve 410 is also gradually compressed and shortened. The elastic telescopic sleeve 410 has two functions: First, it limits the maximum compression of the first spring 409. When the first spring 409 is compressed to the limit length of the elastic telescopic sleeve 410, the elastic telescopic sleeve 410 itself provides rigid resistance to prevent the first spring 409 from being over-compressed, causing the spring coil to die or be permanently deformed. Second, the elastic telescopic sleeve 410 itself is also elastic. During the compression process, it also stores elastic potential energy and applies an auxiliary leftward elastic force to the connecting head 407, making the entire retraction force more gentle and uniform, avoiding the sudden impact when the pure spring is released, and thus reducing damage to the seedling film 3. As the film-winding roller 403 continues to wind up, since the lead film 411 is symmetrically arranged at the ends of the seedling film 3, that is, there is a gap between the two lead films 411, the seedling film 3 is finally wound up on the outer surface of the film-winding roller 403 during the winding process of the film-winding roller 403. During the winding process, the lead film 411 maintains the connection relationship of the connector 407 on the first base plate 401. The side strip design of the lead film 411 allows it to move on the side, avoiding interference with the seedlings on the seedling plate 2. When the seedling film 3 is rolled up, the inner support roller 405 remains attached to the inner surface of the seedling film 3 and rotates with the movement of the seedling film 3, ensuring that the seedling film 3 remains flat during the removal process and will not wrinkle or tear due to uneven local stress. Among them, the inner support roller 405 rotatably connected to the right end of the first base plate 401 and the inner support roller 405 rotatably connected to both ends of the second base plate 404 are attached to the inner surface of the seedling film 3. The inner support roller 405 rotates synchronously with the unfolding of the film, which serves two purposes: first, to provide support for the released film and prevent the film from wrinkling due to gravity; second, to reduce the frictional resistance to the film through rolling contact, making the unfolding of the film smoother. The left end of the first base plate 401 is equipped with a scraper 416 and a corresponding abutment plate 414. The seedling film 3 passes between the two. Through the elastic action of the elastic telescopic column 413, the abutment plate 414 can push the seedling film 3 onto the scraper 416. The scraper 416 continuously presses the film surface as the seedling film 3 passes through. This not only effectively prevents the film from lifting up and hooking the seedlings during the removal process, but also effectively removes impurities attached to the inner surface of the seedling film 3 through the design of the scraper 416 on the inner side.

[0030] The coating process is as follows: Driven in the reverse direction by the drive motor 402, the film rolling roller 403 rotates in the opposite direction between the first base plate 401. At this time, the compressive force on the first spring 409 and the elastic telescopic sleeve 410 during the unwinding and winding of the film gradually weakens. The elastic action can push the connector 407 towards the left end of the first base plate 401, causing the moving block 408 to slide to the left along the moving groove 406, so that the connector 407 is reset and moves synchronously with the traction film 411 connected to the seedling film 3. Finally, the seedling film 3 is reset, so that the seedling film 3 covers the top of the seedling board 2 again, covering the seedlings on the seedling board 2.

[0031] In the above process, through the flexible film winding drive mechanism 4, the drive motor 402 drives the film winding roller 403 to switch between forward and reverse rotation to realize the unwinding and film covering, and the rewinding and unwinding of the film. The starting end of the seedling film 3 is wound around the outer surface of the film winding roller 403. When unwinding and rewinding, the end of the seedling film 3 away from the film winding roller 403 is fixedly connected to the connecting head 407 through the lead film 411. The connecting head 407 moves synchronously with the film body as it is wound under the sliding cooperation of the moving block 408 and the moving groove 406, and squeezes the first spring 409 and the elastic telescopic sleeve 410 between the fixed head 417 and the connecting head 407, so that the two gradually compress from their natural state and store elastic potential energy. When the film is unwound, the compression and restoring force of the first spring 409 and the elastic telescopic sleeve 410 plays a buffering and damping role on the unwinding speed, ensuring that the tension of the film body is uniform and controllable, flat and wrinkle-free when it is unfolded. When unwinding and rewinding, the elastic restoring force and the drive motor 402 play a buffering and damping role on the film covering and unwinding. The two rolls of film are pulled together in the same direction and automatically decrease as the compression decreases. This provides a strong pulling force at the beginning of the film removal process to overcome the adhesion between the film and the seedling tray 2. At the end of the process, the pulling force automatically decreases to avoid tearing the film or pulling up the seedlings. Meanwhile, the elastic telescopic sleeve 410 is fitted outside the first spring 409 to limit the movement, prevent jamming, and provide auxiliary buffering. In conjunction with the inner support roller 405, which is distributed at multiple points on the inner surface of the seedling film 3 and rotates synchronously with the film movement, it provides rolling support throughout the process. The elastic telescopic column 413 drives the abutment plate 414 to apply adaptive elastic downward pressure to the lower surface of the film, so that the film remains in a stable peeling state throughout the process. This achieves a fully automatic effect of flat and accurate alignment of the film during film covering and adaptive force throughout the film removal process to avoid damaging the seedlings or tearing the film. It completely solves the problems of low efficiency and inaccurate alignment leading to uneven heat preservation in existing technologies, and uneven force in manual film removal leading to seedling damage and waste of seedling trays.

[0032] Please refer to the above work process. Figures 1 to 6 .

[0033] The following is the working process of the positional distance adaptation control mechanism 5: Initial state: Sleeve 501 is symmetrically and fixedly connected to the first base plate 401, and is vertically fixed to the first base plate 401. Its position cannot be moved. Electric push rod 503 is fixed to the inner bottom wall of sleeve 501 and is in a retracted state. The lower end of push rod 504 is fixedly connected to the extended end of electric push rod 503, and the upper end is fixedly connected to the second base plate 404. The sliders 505 on both sides of push rod 504 are embedded in the grooves 502 on the inner wall of sleeve 501. The sliders 505 are slidably connected to the grooves 502 to ensure that push rod 504 can only move in the vertical direction. The second spring 506 is symmetrically and fixedly connected between the first base plate 401 and the second base plate 404 in a natural state. A film-winding roller 403 is rotatably arranged between the left ends of the first base plate 401, and an inner support roller 405 is rotatably arranged between the right ends of the first base plate 401. Two inner support rollers 405 are symmetrically rotatably arranged between the two ends of the second base plate 404. The inner support rollers 405 have the same structure, and the positions of the two upper inner support rollers 405, the lower film-winding roller 403, and the inner support rollers 405 correspond vertically to each other, forming a four-cornered... The cloth, since two of the inner support rollers 405 are set on the second base plate 404, and the seedling film 3 starts from the film rolling roller 403, passes through the two upper inner support rollers 405, then passes through the lower inner support roller 405, and is connected to the connector 407 through the lead film 411, and is slidably set on the first base plate 401. At this time, the height of the upper inner support roller 405 is determined by the position of the second base plate 404. That is, when covering the film, the distance between the seedling film 3 and the lead film 411 can be determined by the height of the second base plate 404.

[0034] When the height of the second base plate 404 needs to be adjusted to accommodate different seedling heights, it extends (or retracts) by starting the electric push rod 503, as follows: When the electric push rod 503 extends: the piston rod of the electric push rod 503 pushes the push rod 504 upward, and the push rod 504 moves upward in the vertical direction. Since the sliders 505 on both sides of the push rod 504 are embedded in the slide groove 502, the sliders 505 slide upward synchronously along the slide groove 502, which guides and limits the movement of the push rod 504, preventing the push rod 504 from tilting or rotating during the rising process. The upper end of the push rod 504 is fixedly connected to the second base plate 404, so the second base plate 404 rises synchronously with the push rod 504. When the second base plate 404 rises, the distance between the second base plate 404 and the first base plate 401 increases. At this time, the second spring 506 fixed between the two is stretched. After being stretched, the second spring 506 generates a downward restoring force. This force acts on the second base plate 404 and forms a force balance with the upward pushing force of the electric push rod 503. When the electric push rod 503 stops extending, the second base plate 404 stabilizes at a new height. At this time, the inner support roller 405 is rotatably connected to both ends of the second base plate 404. The height change of the second base plate 404 directly drives the height change of the inner support roller 405. Since the inner support roller 405 is attached to the inner surface of the seedling film 3, the height adjustment of the inner support roller 405 allows the distance between the seedling film 3 and the seedling board 2 to be precisely controlled. When the seedlings are short, the height of the second base plate 404 is lowered so that the film is closer to the seedlings, resulting in better heat preservation. When the seedlings grow taller and the film needs to be removed, the second base plate 404 is raised so that the inner support roller 405 rises, providing enough space for the film to be removed and preventing the film from scratching the top of the seedlings.

[0035] When the electric push rod 503 retracts: the piston rod of the electric push rod 503 retracts downward, the push rod 504 moves downward under the combined action of its own weight and the restoring force of the second spring 506, the slider 505 slides downward along the slide groove 502, the second base plate 404 descends accordingly, the tension of the second spring 506 decreases, and the restoring force also decreases accordingly. When the electric push rod 503 is fully retracted to its initial length, the second base plate 404 returns to its initial height, and the entire position distance adaptation control mechanism 5 resets.

[0036] Because different batches of seedlings have different heights, traditional fixed structures cannot adapt to these changes, resulting in the film either damaging the seedlings or lifting them up when the film is removed. This mechanism, however, uses an electric push rod 503 to precisely control the height of the second base plate 404. Combined with the elastic buffer of the second spring 506 and the guiding and limiting functions of the slider 505 and the groove 502, it achieves real-time adaptive adjustment of the distance between the film and the seedlings. This ensures both heat preservation and sealing during film covering and prevents damage to the seedlings when the film is removed.

[0037] In the above process, through the setting of the position adjustment mechanism 5, the electric push rod 503 is fixed to the inner bottom wall of the sleeve 501 to drive the top rod 504 to rise and fall vertically. The upper end of the top rod 504 is fixedly connected to the second base plate 404, and the lower end is fixedly connected to the protruding end of the electric push rod 503. The sliders 505 on both sides of the top rod 504 are embedded in the sliding grooves 502 on the inner wall of the sleeve 501 to ensure that the top rod 504 moves strictly in the vertical direction without tilting or rotating. When the second base plate 404 rises and falls, it drives the inner support rollers 405 connected to its two ends to rise and fall synchronously. The inner support rollers 405 are attached to the inner surface of the seedling film 3, and their height directly determines the spatial distance between the seedling film 3 and the seedling board 2. In conjunction with the second spring 506 fixed between the first base plate 401 and the second base plate 404, it is stretched when the second base plate 404 rises, resulting in downward return. The balance between the elastic force and the thrust of the electric push rod 503 keeps the second base plate 404 stably suspended at the target height. When covering the seedlings, the electric push rod 503 retracts, causing the second base plate 404 to descend, and the inner support roller 405 presses down on the inner surface of the seedling film 3, bringing the film closer to the seedlings to enhance the heat preservation and sealing effect. When removing the film, the electric push rod 503 extends, causing the second base plate 404 to rise, and the inner support roller 405 is lifted away from the inner surface of the seedling film 3, creating sufficient clearance for film removal. This achieves the effect of real-time adaptive and precise adjustment of the distance between the film and the seedlings according to the actual growth height of the seedlings, and the same equipment can be directly adapted to different batches of seedlings of different heights without changing the tooling. This completely solves the problem in the existing technology that the fixed structure cannot adapt to changes in seedling height, causing the film to damage the seedlings during covering or the film to scrape the top of the seedlings during removal, resulting in a decline in seedling quality.

[0038] Please refer to the above work process. Figures 1 to 6 .

[0039] The circuits and controls involved in this invention are all existing technologies and will not be described in detail here.

[0040] 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 seedling raising device for rice cultivation, comprising a support frame (1), wherein seedling boards (2) are fixedly connected at equal intervals on the support frame (1), and seedling films (3) are provided on the seedling boards (2), characterized in that, It also includes: a flexible winding film drive mechanism (4) and a position distance adaptation and control mechanism (5), and the flexible winding film drive mechanism (4) and the position distance adaptation and control mechanism (5) are both located between the seedling board (2) and the seedling film (3); The flexible film winding mechanism (4) includes a first base plate (401), a film winding roller (403), a second base plate (404), a connector (407), a first spring (409), and a traction film (411). The first base plate (401) is symmetrically arranged on both sides of the seedling board (2). The film winding roller (403) is arranged between the left ends of the first base plate (401). The second base plate (404) is arranged above the first base plate (401). The connector (407) is arranged at the left end of the first base plate (401). The first spring (409) is arranged on the connector (407). The traction film (411) is arranged between the seedling film (3) and the connector (407). The positional adjustment mechanism (5) includes a sleeve (501), an electric push rod (503), and a top rod (504). The sleeve (501) is symmetrically arranged on the first base plate (401), the electric push rod (503) is arranged inside the sleeve (501), and the top rod (504) is arranged between the second base plate (404) and the electric push rod (503).

2. The seedling raising equipment for rice cultivation according to claim 1, characterized in that, The flexible film winding drive mechanism (4) also includes a drive motor (402) fixedly connected to the first base plate (401), the film winding roller (403) is rotatably connected between the first base plates (401), and the film winding roller (403) is fixedly connected to the output end of the drive motor (402). The right end of the first base plate (401) and both ends of the second base plate (404) are rotatably connected to inner support rollers (405), and the inner support rollers (405) are attached to the inner surface of the seedling film (3).

3. The seedling raising equipment for rice cultivation according to claim 1, characterized in that, The first base plate (401) has a moving groove (406) on one side facing each other, and the connector (407) has a moving block (408) fixedly connected to the opposite side, and the moving block (408) is slidably connected to the moving groove (406).

4. The seedling raising equipment for rice cultivation according to claim 1, characterized in that, The first base plate (401) has a fixed head (417) fixedly connected to the right end of the opposite side. The first spring (409) is fixedly connected between the fixed head (417) and the connecting head (407). An elastic telescopic sleeve (410) is also fixedly connected between the fixed head (417) and the connecting head (407), and the elastic telescopic sleeve (410) is sleeved on the outside of the first spring (409).

5. The seedling raising equipment for rice cultivation according to claim 1, characterized in that, The left end of the seedling film (3) is wound around the outer surface of the film rolling roller (403), and the lead film (411) is symmetrically fixedly connected to the end of the seedling film (3) away from the film rolling roller (403), and the end of the lead film (411) away from the seedling film (3) is fixedly connected to the connector (407).

6. The seedling raising equipment for rice cultivation according to claim 1, characterized in that, The first base plate (401) has a bending plate (415) fixedly connected to the left end of the opposite side. A scraper (416) is fixedly connected between the bending plates (415), and the scraper (416) is set above the film rolling roller (403) and is in contact with the seedling film (3).

7. A seedling raising device for rice cultivation according to claim 6, characterized in that, The support frame (1) has mounting plates (412) fixedly connected at equal intervals on both sides of its inner wall. Elastic telescopic columns (413) are symmetrically fixedly connected on the mounting plates (412). A stop plate (414) is fixedly connected between the ends of the elastic telescopic columns (413) away from the mounting plates (412). The seedling film (3) is placed between the stop plate (414) and the scraper (416), and the stop plate (414) is in contact with the seedling film (3).

8. The seedling raising equipment for rice cultivation according to claim 1, characterized in that, The positional adjustment mechanism (5) further includes a second spring (506) symmetrically fixed between the first base plate (401) and the second base plate (404), the sleeve (501) is vertically fixedly connected to the first base plate (401), and the electric push rod (503) is fixedly connected to the inner bottom wall of the sleeve (501).

9. A seedling raising device for rice cultivation according to claim 1, characterized in that, The sleeve (501) has symmetrical grooves (502) on both sides of its inner wall. The top rod (504) has sliders (505) symmetrically fixedly connected to both sides, and the sliders (505) are slidably connected in the grooves (502).

10. A seedling raising device for rice cultivation according to claim 1, characterized in that, The upper end of the top rod (504) is fixedly connected to the second base plate (404), and the lower end of the top rod (504) is fixedly connected to the electric push rod (503).

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