Layered multi-blocking film unwinding and winding mechanism for mechanical transplanting bare seedling belt production

Abstract

The invention discloses a layered multi-blocking film unwinding and winding mechanism for mechanical transplanting bare seedling belt production. The layered multi-blocking film unwinding and winding mechanism comprises a rack, and a first film unwinding device and a winding device are installed at the front end and the rear end of the rack respectively; a second film releasing device is mounted in the middle of the rack; a fixed-length film feeding device is further mounted at the front end of the rack; the first film releasing device comprises an electromagnetic damper acting on a first rotating shaft of the first film releasing device, and further comprises a first self-adaptive tension adjusting device; a lower film released by the first film releasing device sequentially passes through the first self-adaptive tension adjusting device and the fixed-length film feeding device; the second film releasing device comprises a damping device acting on a second rotating shaft of the second film releasing device and further comprises a second self-adaptive tensioning adjusting device. The machine frame is further provided with a film pressing device located on the rear side of the second film releasing device, and an upper film released by the second film releasing device sequentially passes through the second self-adaptive tensioning adjusting device and the film pressing device. The film unwinding and winding mechanism can fully adapt to the production characteristics of bare seedling belts, and upper and lower films can be effectively managed.

Description

Technical Field

[0001] The invention relates to the technical field of production equipment for bare seedling belts for agricultural transplanting, and in particular to a layered multi-barrier film-releasing and film-rolling mechanism for mechanized production of bare seedling belts for transplanting. Background Art

[0002] Transplanting bare seedlings (seedlings not wrapped in substrate or soil) is an important means of agricultural crop planting, and is often used in the planting of crops such as sweet potatoes, Chinese medicinal materials, rice seedlings, and rapeseed seedlings.

[0003] Taking sweet potato as an example, the applicant's prior application CN113475205A provides a roll-type sweet potato transplanting mechanism, in which the transplanting operation is carried out based on the sweet potato seedling material tray. The sweet potato seedling material tray is formed by winding a long strip of roll-up tape, and the roll-up tape is composed of two belt bodies. The sweet potato seedlings are arranged between the two belt bodies. When in use, the separation mechanism separates the double-layer belt bodies, so that the sweet potato seedlings are separated from the roll-up tape for transplanting operations.

[0004] In order to realize the continuous transplanting operation, the above-mentioned sweet potato seedling tray (also known as bare seedling tray) needs to be continuously produced. To this end, it is necessary to clamp the sweet potato seedlings between two layers of film at equal distances and fix them, and to roll up the two layers of film with the sweet potato seedlings to form a sweet potato seedling tray. During the implementation process, it is necessary to place the two layers of film separately, and to roll up the two layers of film containing the sweet potato seedlings after the sweet potato seedlings are placed and fixed.

[0005] As in the prior art, patent CN118953794A provides an automatic separation, packaging and winding machine for rhizome Chinese medicinal seedlings and its operation method, which provides a frame, a seedling separation device, a seedling retrieval device, a conveying device, a hot-melt packaging device, a pressing device and a winding device, integrating separation, conveying, identification, packaging and winding, and can realize the single separation of rhizome Chinese medicinal seedlings piled into bundles, the release of the upper seedling belt and the lower seedling belt, and the completion of the automatic hot-melt packaging and winding operation of the medicinal seedling belt, wherein the hot melting is carried out by a sheet-like ceramic hot-melt sheet, and two straight-line strip fusion belts are ironed on the seedling belt. This strip fusion belt is easy to break when the seedling belt is subjected to a large pulling force and the subsequent upper and lower seedling belts are not easy to separate. This strip fusion belt is easy to break when the seedling belt is subjected to a large pulling force. Therefore, during the production process, if the film tension is not properly controlled, it is easy to cause damage or breakage of the upper and lower films, affecting the subsequent transplanting operation. It is necessary to effectively control the film retraction and release to ensure the continuous stability of production. Summary of the invention

[0006] Purpose of the invention: In order to overcome the shortcomings of the prior art, the present invention provides a layered multi-barrier film-releasing and film-rolling mechanism for mechanized transplanting bare seedling strip production, which can fully adapt to the production characteristics of bare seedling strips, effectively manage the upper and lower films, and prevent damage or breakage caused by improper tension control of the film.

[0007] Technical solution: To achieve the above-mentioned purpose, the layered multi-barrier film laying and film rolling mechanism for mechanized transplanting bare seedling belt production of the present invention comprises a frame, and the front and rear ends of the frame are respectively equipped with a first film laying device and a winding device; the middle part of the frame is equipped with a second film laying device; the lower film and the upper film respectively released by the first film laying device and the second film laying device can be rolled up by the winding device after being stacked, and the winding device is driven to operate by a winding motor;

[0008] A fixed-length film feeding device is also installed at the front end of the frame; and the first film placing device includes an electromagnetic damper acting on its first rotating shaft, and also includes a first adaptive tensioning adjustment device, and the lower film roll is fixed on the first rotating shaft through a mechanical tensioner; the lower film released by the first film placing device passes through the first adaptive tensioning adjustment device and the fixed-length film feeding device in sequence;

[0009] The second film placing device includes a damping device acting on its second rotating shaft, and also includes a second adaptive tensioning adjustment device, and the upper film roll is fixed to the second rotating shaft by a mechanical tensioner; the frame is also equipped with a film pressing device located on the rear side of the second film placing device, and the upper film released by the second film placing device passes through the second adaptive tensioning adjustment device and the film pressing device in sequence.

[0010] The above-mentioned layered multi-obstruction film releasing and winding mechanism is used in the production of naked seedling belts, aiming to clamp the naked seedlings between the upper film and the lower film, and perform hot sealing operations on both sides of each naked seedling, forming two rows of hot spots on both sides of the naked seedlings. At each hot spot, the upper film and the lower film are heated and bonded together, so that the naked seedlings will not fall off from between the upper film and the lower film.

[0011] In actual use, a conveyor belt is installed on the frame, and bare seedling positioning devices are installed on the conveyor belt at equal intervals. The lower film released by the first film-releasing device is spread on the upper surface of the conveyor belt. Through the coordinated cooperation of the fixed-length film feeding device and the winding device, the conveyor belt and the lower film can move at the same speed. Since there is a long distance between the first film-releasing device and the second film-releasing device, the bare seedlings can be placed on the bare seedling positioning device, and the bare seedlings are located on the upper surface of the lower film; when the bare seedling positioning device passes through the film pressing device driven by the conveyor belt, the upper film covers the top of the bare seedlings. In this way, the bare seedlings can be hot-sealed between the film pressing device and the winding device.

[0012] The above-mentioned layered multi-obstruction film unwinding and film rolling mechanism fully adapts to the characteristics of bare seedling belt production. The fixed-length film feeding device and the winding device can realize the synchronous movement of the lower film and the conveyor belt, and prevent the winding device from pulling over a long distance to cause damage or wrinkling of the lower film. The electromagnetic damper can increase the rotational resistance of the lower film roll installed on the first film unwinding device. Combined with the first adaptive tensioning adjustment device, the lower film can be kept in a taut state to prevent the lower film roller from reversing and causing the lower film to loosen, and prevent the lower film from being broken. The damping device can make the upper film roll on the second rotating shaft in a state of micro-resistance and non-inertial rotation. In conjunction with the second adaptive tensioning adjustment device, the motor between the second adaptive tensioning adjustment device and the winding device can be in a moderately taut state. The resistance of the damping device can be manually adjusted as needed to prevent tearing and hot spots during hot sealing.

[0013] Furthermore, the first film placing device further comprises a first bracket, a first rotating shaft is rotatably mounted on the first bracket, and a first fixed wheel is rotatably mounted on the first bracket; the first adaptive tensioning and adjusting device comprises a first rod rotatably mounted relative to the first bracket, a first moving wheel mounted on the end of the first rod, and a first spring connecting the first rod and the first bracket. The first spring and the first rotating shaft are located on the same side of the first rod, and the first moving wheel is located on the other side of the first rod. The lower film released by the lower film roll passes through the first fixed wheel and the first moving wheel in sequence and then passes through the fixed-length film feeding device, so that the lower film between the lower film roll and the fixed-length film feeding device is S-shaped, so that adaptive tensioning of the lower film can be achieved and the lower film can be prevented from wrinkling.

[0014] Preferably, an angular displacement sensor is provided between the first rod and the first bracket to detect the relative angle between the two. When the relative angle between the two exceeds the maximum value of a preset threshold range, it indicates that the damping of the electromagnetic damper is too large. Therefore, the control system reduces the operating current of the electromagnetic damper to reduce the damping; when the relative angle is less than the minimum value of the preset threshold range, it indicates that the damping of the electromagnetic damper is small. Therefore, the control system increases the operating current of the electromagnetic damper to increase the current.

[0015] Furthermore, the fixed-length film feeding device includes a lower clamping wheel, an upper clamping wheel, and an adjustment mechanism for changing the height of the upper clamping wheel, and also includes a film feeding motor for driving the lower clamping wheel to operate. The upper clamping wheel can be raised to facilitate film feeding through the adjustment mechanism, and the upper clamping wheel can be lowered to clamp the lower film.

[0016] Furthermore, the second film placing device further comprises a second bracket, a second rotating shaft is rotatably mounted on the second bracket, and a second fixed wheel is rotatably mounted on the second bracket; the second adaptive tensioning and adjusting device comprises a second rod rotatably mounted relative to the second bracket, a second moving wheel mounted on the end of the second rod, and a second spring connecting the second rod and the second bracket. The second spring and the second rotating shaft are located on the same side of the second rod, and the second moving wheel is located on the other side of the second rod. The upper film released by the upper film roll passes through the second fixed wheel and the second moving wheel in sequence and then passes through the film pressing device, so that the upper film between the upper film roll and the film pressing device is S-shaped, so that adaptive tensioning of the upper film can be achieved and the upper film can be prevented from wrinkling.

[0017] Furthermore, the damping device includes an adjustment seat mounted on the second bracket, and also includes a damping pressure plate fixed on the adjustment seat and acting on the second rotating shaft. The damping pressure plate has an arc surface that matches the second rotating shaft; by adjusting the adjustment seat, the force of the damping pressure plate acting on the second rotating shaft can be changed, that is, the friction between the two can be changed, so as to adjust the resistance of the second rotating shaft, so as to adapt to the nonlinear characteristics of the upper film having a bulge due to the clamping of the naked seedling between the upper and lower molds, so as to make the release length of the upper film nonlinear.

[0018] Furthermore, the frame is equipped with two front and rear film pressing devices, and also includes a wheel group located at the rear end of the frame. The hot sealing device for hot sealing the upper film and the lower film is located between the two sets of film pressing devices, and the hot sealing device has two rows of hot posts arranged in a trumpet shape, and the ends of the hot posts act on the upper film and the lower film to form two rows of hot spots arranged in a trumpet shape. The upper film and the lower film are fused and adhered to each other at each hot spot, and the distance between the hot spots on both sides of the tail of the naked seedling is short, and the distance between the hot spots on both sides of the head of the naked seedling is long, so as to adapt to the shape characteristics of the naked seedlings and prevent the naked seedlings from falling off. The form of multiple hot spots is convenient for peeling off the upper and lower films to release the naked seedlings in subsequent use, and the upper and lower films will not break after peeling off. The wheel group includes three redirecting wheels in a triangular layout, and the upper film and the lower film between the film pressing device and the winding device on the rear side are S-shaped.

[0019] Preferably, one of the redirecting wheels of the wheel set is slidably installed relative to the frame, and a spring and a displacement sensor are arranged between the redirecting wheel and the frame. The control system can adaptively control the winding motor by acquiring the displacement data collected by the displacement sensor. When the displacement is greater than the maximum value of the preset displacement threshold, the speed of the winding motor is reduced, and when the displacement is less than the minimum value of the preset displacement threshold, the speed of the winding motor is increased. In this way, the release length of the lower film is accurately controlled by the fixed-length film feeding device, and the winding motor plays a cooperative role. The coordinated operation of the two can realize the stable operation of the system and ensure the reasonable tension of the upper and lower films.

[0020] Beneficial effects: The layered multi-obstruction film unwinding and film rolling mechanism for mechanized transplanting bare seedling belt production of the present invention fully adapts to the characteristics of bare seedling belt production. The fixed-length film feeding device cooperates with the winding device to realize synchronous movement of the lower film and the conveyor belt, and prevents the winding device from pulling over a long distance to cause damage or wrinkling of the lower film. The electromagnetic damper can increase the rotational resistance of the lower film roll installed on the first film unwinding device. Combined with the first adaptive tensioning adjustment device, the lower film can be kept in a taut state, preventing the lower film roller from reversing to cause the lower film to relax, and preventing the lower film from being broken. The damping device can make the upper film roll on the second rotating shaft in a state of micro-resistance and non-inertial rotation. Cooperating with the second adaptive tensioning adjustment device, the motor between the second adaptive tensioning adjustment device and the winding device can be in a moderately taut state. The resistance of the damping device can be manually adjusted as needed to prevent tearing and hot spots during hot sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural diagram of a layered multi-blocking film-releasing and film-rolling mechanism used for mechanized transplanting bare seedling belt production;

[0022] Figure 2 It is a top view of the structure of the layered multi-blocking film unwinding and film rolling mechanism used for mechanized transplanting bare seedling belt production (including conveyor belt, hot sealing device and bare seedling positioning device);

[0023] Figure 3 is a structural diagram of the first film placing device;

[0024] Figure 4 is a combined structural diagram of the first rotating shaft and the electromagnetic damper;

[0025] Figure 5 is a structural diagram of the second film placing device;

[0026] Figure 6 is a combined structural diagram of the second rotating shaft and the damping device;

[0027] Figure 7 This is a structural diagram of a fixed-length film feeding device;

[0028] Figure 8 It is a structural diagram of the hot sealing device;

[0029] Fig. 9 Schematic diagram of the combination of naked seedlings and upper and lower films after hot sealing.

[0030] In the figure: 1-frame; 2-first film-releasing device; 21-first rotating shaft; 22-electromagnetic damper; 23-first adaptive tension adjusting device; 23a-first rod; 23b-first moving wheel; 23c-first spring; 24-first bracket; 25-first fixed wheel; 3-winding device; 4-second film-releasing device; 41-second rotating shaft; 42-damping device; 42a-damping pressure plate; 42b-adjusting seat; 43-second adaptive tension adjusting device; 43a-second rod; 43b-second moving wheel; 43c-second spring; 44-second bracket; 45-second fixed wheel; 46-adjusting seat; 5-winding motor; 6-fixed-length film feeding device; 61-lower clamping wheel; 62-upper clamping wheel; 63-adjusting mechanism; 64-film feeding motor; 7-film pressing device; 8-wheel set; 81-redirecting wheel; 9-bare seedling positioning device; 10-conveyor belt; 11-hot sealing device; 11a-hot sealing column; 11b-protective component; 11c-heat-conducting seat; a-lower film roll; b-upper film roll. DETAILED DESCRIPTION

[0031] The present invention will be further described below in conjunction with the accompanying drawings.

[0032] like Figure 1 The layered multi-blocking film laying and film rolling mechanism for mechanized transplanting bare seedling belt production shown in the figure comprises a frame 1, and the front and rear ends of the frame 1 are respectively equipped with a first film laying device 2 and a winding device 3; the middle part of the frame 1 is equipped with a second film laying device 4; the lower film and the upper film respectively released by the first film laying device 2 and the second film laying device 4 can be rolled up by the winding device 3 after being stacked, and the winding device 3 is driven to operate by a winding motor 5;

[0033] The front end of the frame 1 is also equipped with a fixed-length film feeding device 6; Figure 4 As shown, the first film placing device 2 comprises an electromagnetic damper 22 acting on its first rotating shaft 21, and also comprises a first adaptive tensioning adjustment device 23, and the lower film roll a is fixed on the first rotating shaft 21 through a mechanical tensioner; the lower film released by the first film placing device 2 passes through the first adaptive tensioning adjustment device 23 and the fixed-length film feeding device 6 in sequence;

[0034] like Figure 6 As shown, the second film placing device 4 includes a damping device 42 acting on its second rotating shaft 41, and also includes a second adaptive tensioning adjustment device 43, and the upper film roll b is fixed to the second rotating shaft 41 by a mechanical tensioner; the frame 1 is also equipped with a film pressing device 7 located on the rear side of the second film placing device 4, and the upper film released by the second film placing device 4 passes through the second adaptive tensioning adjustment device 43 and the film pressing device 7 in sequence.

[0035] The above-mentioned layered multi-obstruction film releasing and winding mechanism is used in the production of naked seedling belts, aiming to clamp the naked seedlings between the upper film and the lower film, and perform hot sealing operations on both sides of each naked seedling, forming two rows of hot spots on both sides of the naked seedlings. At each hot spot, the upper film and the lower film are heated and bonded together, so that the naked seedlings will not fall off from between the upper film and the lower film.

[0036] In actual use, such as Figure 2 As shown, a conveyor belt 10 is installed on the frame 1, and bare seedling positioning devices 9 are equidistantly installed on the conveyor belt 10. The lower film released by the first film-releasing device 2 is spread on the upper surface of the conveyor belt. Through the cooperation of the fixed-length film-feeding device 6 and the winding device 3, the conveyor belt and the lower film can move at the same speed. Since there is a long distance between the first film-releasing device 2 and the second film-releasing device 4, bare seedlings can be placed on the bare seedling positioning device, and the bare seedlings are located on the upper surface of the lower film; when the bare seedling positioning device 9 passes through the film pressing device 7 driven by the conveyor belt 10, the upper film covers the top of the bare seedlings. In this way, the bare seedlings can be hot-sealed between the film pressing device 7 and the winding device 3.

[0037] The above-mentioned layered multi-obstruction film unwinding and film rolling mechanism fully adapts to the characteristics of bare seedling belt production. The fixed-length film feeding device 6 cooperates with the winding device 3 to realize the synchronous movement of the lower film and the conveyor belt 10, and prevents the winding device 3 from pulling over a long distance to cause the lower film to be damaged or wrinkled. The electromagnetic damper 22 can increase the rotation resistance of the lower film roll a installed on the first film unwinding device 2. Combined with the first adaptive tensioning adjustment device 23, the lower film can be kept in a taut state to prevent the lower film roller from reversing and causing the lower film to relax, and prevent the lower film from being broken. The damping device 42 can make the upper film roll b on the second rotating shaft 41 in a state of slight resistance and no inertia rotation. In conjunction with the second adaptive tensioning adjustment device 43, the motor between the second adaptive tensioning adjustment device 43 and the winding device 3 can be in a moderately taut state. The resistance of the damping device 42 can be manually adjusted as needed to prevent tearing and hot spots during hot sealing.

[0038] Preferably, if Figure 3As shown, the first film placing device 2 further includes a first bracket 24, a first rotating shaft 21 is rotatably mounted on the first bracket 24, and a first fixed wheel 25 is rotatably mounted on the first bracket 24; the first adaptive tensioning adjustment device 23 includes a first rod 23a rotatably mounted relative to the first bracket 24, a first moving wheel 23b mounted at the end of the first rod 23a, and a first spring 23c connecting the first rod 23a and the first bracket 24. The first spring 23c and the first rotating shaft 21 are located on the same side of the first rod 23a, and the first moving wheel 23b is located on the other side of the first rod 23a. The lower film released by the lower film roll a passes through the first fixed wheel 25 and the first moving wheel 23b in sequence and then passes through the fixed length film feeding device 6, so that the lower film between the lower film roll a and the fixed length film feeding device 6 is S-shaped, so that the adaptive tensioning of the lower film can be achieved and the lower film can be prevented from wrinkling.

[0039] Preferably, an angular displacement sensor is provided between the first rod 23a and the first bracket 24 to detect the relative angle between the two. When the relative angle between the two exceeds the maximum value of a preset threshold range, it indicates that the damping of the electromagnetic damper 22 is too large. Therefore, the control system reduces the operating current of the electromagnetic damper 22 to reduce the damping; when the relative angle is less than the minimum value of the preset threshold range, it indicates that the damping of the electromagnetic damper 22 is small. Therefore, the control system increases the operating current of the electromagnetic damper 22 to increase the current.

[0040] Preferably, if Figure 7 As shown, the fixed-length film feeding device 6 includes a lower clamping wheel 61, an upper clamping wheel 62, and an adjusting mechanism 63 for changing the height of the upper clamping wheel 62, and also includes a film feeding motor 64 for driving the lower clamping wheel 61. The upper clamping wheel 62 can be raised to facilitate film feeding through the adjusting mechanism 63, and the upper clamping wheel 62 can be lowered to clamp the lower film.

[0041] Preferably, if Figure 5 As shown, the second film placing device 4 also includes a second bracket 44, a second rotating shaft 41 is rotatably mounted on the second bracket 44, and a second fixed wheel 45 is rotatably mounted on the second bracket 44; the second adaptive tensioning adjustment device 43 includes a second rod 43a rotatably mounted relative to the second bracket 44, a second moving wheel 43b mounted on the end of the second rod 43a, and a second spring 43c connecting the second rod 43a and the second bracket 44. The second spring 43c and the second rotating shaft 41 are located on the same side of the second rod 43a, and the second moving wheel 43b is located on the other side of the second rod 43a. The upper film released by the upper film roll b passes through the second fixed wheel 45 and the second moving wheel 43b in sequence and then passes through the film pressing device 7, so that the upper film between the upper film roll b and the film pressing device 7 is S-shaped, so that the adaptive tensioning of the upper film can be achieved and the upper film can be prevented from wrinkling.

[0042] Preferably, the damping device 42 includes an adjustment seat 42b installed on the second bracket 44, and also includes a damping pressure plate 42a fixed on the adjustment seat 42b and acting on the second rotating shaft 41. The damping pressure plate 42a has an arc surface that matches the second rotating shaft 41; by adjusting the adjustment seat 46, the force of the damping pressure plate 42a acting on the second rotating shaft 41 can be changed, that is, the friction between the two can be changed, so as to adjust the resistance of the second rotating shaft 41, so as to adapt to the nonlinear characteristics of the upper film having a bulge due to the clamping of the naked seedling between the upper and lower molds, so as to release the upper film.

[0043] Preferably, the frame 1 is provided with two front and rear film pressing devices 7, and also includes a wheel set 8 located at the rear end of the frame 1. The hot sealing device 11 for hot sealing the upper film and the lower film is located between the two sets of film pressing devices 7. Figure 8 As shown, the hot sealing device 11 has two rows of hot posts 11a arranged in a trumpet shape. The ends of the hot posts 11a act on the upper film and the lower film to form two rows of hot spots arranged in a trumpet shape (such as Fig. 9 As shown, the upper film and the lower film are fused and adhered to each other at the position of each hot spot, and the distance between the hot spots near the tail of the bare seedling is close, and the distance between the hot spots near the head of the bare seedling is far, which adapts to the shape characteristics of the bare seedling and can prevent the bare seedling from falling off. The form of multiple hot spots is convenient for peeling off the upper and lower films to release the bare seedlings in subsequent use, and the upper and lower films are not easy to break after peeling off. The wheel group 8 includes three redirecting wheels 81 in a triangular layout, and the upper and lower films between the film pressing device 7 and the winding device 3 on the rear side are S-shaped. The hot sealing device 11 also has a protective member 11b with a trumpet-shaped groove at the bottom. The protective member 11b is located between two rows of hot posts 11a, and there is a gap between the outer wall of the protective member 11b and the heat-conducting seat 11c of the hot sealing device 11. During hot sealing, the protective member 11b buckles the naked seedlings inside through the upper film to prevent the naked seedlings from being scalded, and the protective member 11b can float elastically up and down relative to the heat-conducting seat 11c. The two sides of the protective member 11b press the upper and lower films together before the hot posts 11a contact the upper film to ensure the firmness of the hot points.

[0044] Preferably, one of the redirecting wheels 81 of the wheel set 8 is slidably installed relative to the frame 1, and a spring and a displacement sensor are provided between the redirecting wheel 81 and the frame 1. The control system can adaptively control the winding motor 5 by acquiring the displacement data collected by the displacement sensor. When the displacement is greater than the maximum value of the preset displacement threshold, the speed of the winding motor 5 is reduced, and when the displacement is less than the minimum value of the preset displacement threshold, the speed of the winding motor 5 is increased. In this way, the release length of the lower film is accurately controlled by the fixed-length film feeding device 6, and the winding motor 5 plays a cooperative role. The coordinated operation of the two can realize the stable operation of the system and ensure the reasonable tension of the upper and lower films.

[0045] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A layered multi-barrier film laying and film rolling mechanism for mechanized transplanting bare seedling belt production, comprising a frame (1), wherein a first film laying device (2) and a winding device (3) are respectively installed at the front and rear ends of the frame (1); a second film laying device (4) is installed in the middle of the frame (1); the lower film and the upper film respectively released by the first film laying device (2) and the second film laying device (4) can be rolled up by the winding device (3) after being stacked, and the winding device (3) is driven to operate by a winding motor (5); characterized in that: The front end of the frame (1) is also equipped with a fixed-length film feeding device (6); the first film placing device (2) comprises an electromagnetic damper (22) acting on its first rotating shaft (21), and also comprises a first adaptive tensioning adjustment device (23); the lower film released by the first film placing device (2) passes through the first adaptive tensioning adjustment device (23) and the fixed-length film feeding device (6) in sequence; The second film placing device (4) includes a damping device (42) acting on its second rotating shaft (41), and also includes a second adaptive tensioning adjustment device (43); the frame (1) is also equipped with a film pressing device (7) located at the rear side of the second film placing device (4), and the upper film released by the second film placing device (4) passes through the second adaptive tensioning adjustment device (43) and the film pressing device (7) in sequence.

2. The layered multi-barrier film-releasing and film-rolling mechanism for mechanized transplanting bare seedling belt production according to claim 1 is characterized in that: The first film placing device (2) also includes a first bracket (24), on which a first fixed wheel (25) is rotatably mounted; the first adaptive tensioning adjustment device (23) includes a first rod (23a) rotatably mounted relative to the first bracket (24), a first moving wheel (23b) mounted at the end of the first rod (23a), and a first spring (23c) connecting the first rod (23a) and the first bracket (24).

3. The layered multi-barrier film-releasing and film-rolling mechanism for mechanized transplanting bare seedling belt production according to claim 1 is characterized in that: The fixed-length film feeding device (6) comprises a lower clamping wheel (61), an upper clamping wheel (62), and an adjustment mechanism (63) for changing the height of the upper clamping wheel (62), and also comprises a film feeding motor (64) for driving the lower clamping wheel (61) to operate.

4. The layered multi-barrier film-releasing and film-rolling mechanism for mechanized transplanting bare seedling belt production according to claim 1 is characterized in that: The second film placing device (4) also includes a second bracket (44), on which a second fixed wheel (45) is rotatably mounted; the second adaptive tensioning adjustment device (43) includes a second rod (43a) rotatably mounted relative to the second bracket (44), a second moving wheel (43b) mounted at the end of the second rod (43a), and a second spring (43c) connecting the second rod (43a) and the second bracket (44).

5. The layered multi-barrier film-releasing and film-rolling mechanism for mechanized transplanting bare seedling belt production according to claim 1 is characterized in that: The damping device (42) comprises an adjustment seat (42b) mounted on the second bracket (44), and also comprises a damping pressure plate (42a) fixed on the adjustment seat (42b) and acting on the second rotating shaft (41).

6. The layered multi-barrier film-releasing and film-rolling mechanism for mechanized transplanting bare seedling belt production according to claim 1 is characterized in that: The frame (1) is provided with two front and rear film pressing devices (7), and also includes a wheel set (8) located at the rear end of the frame (1).

Images