Layered multi-resistance film release mechanism for mechanized production of bare seedling tape

Abstract

The application discloses a layered multi-resistance film releasing and rolling mechanism for mechanized production of bare seedling tape, which comprises a rack, first film releasing devices and a rolling device respectively installed at the front and rear ends of the rack, a second film releasing device installed at the middle part of the rack, a fixed-length film feeding device installed at the front end of the rack, and a first self-adapting tension adjusting device and an electromagnetic damper acting on a first rotating shaft of the first film releasing device; the lower film released by the first film releasing device sequentially passes through the first self-adapting 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 and a second self-adapting tension adjusting device; a film pressing device is further installed on the rack at the rear side of the second film releasing device, and the upper film released by the second film releasing device sequentially passes through the second self-adapting tension adjusting device and the film pressing device. The film releasing and rolling mechanism can fully adapt to the characteristics of bare seedling tape production and effectively manage the upper and lower films.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of production equipment for bare seedling tapes used in agricultural transplanting, in particular to a layered multi-resistance disturbance film unwinding and winding mechanism for mechanized production of bare seedling tapes. BACKGROUND

[0002] Bare seedling (seedling without being wrapped with substrate or soil) transplanting is an important agricultural crop planting method, which is often used in the planting of crops such as sweet potatoes, Chinese herbal medicines, rice seedlings, and rapeseed seedlings.

[0003] Taking sweet potatoes as an example, the applicant's prior application CN113475205A provides a tape-winding sweet potato transplanting mechanism. In this mechanism, sweet potato seedling trays are used for transplanting operations. The sweet potato seedling tray is wound by a long strip-shaped tape, and the tape is composed of two tape bodies. The sweet potato seedlings are arranged between the two tape bodies. When in use, a separation mechanism separates the double-layer tape body, so that the sweet potato seedlings are separated from the tape for transplanting operations.

[0004] In order to realize the continuous performance of the above-mentioned transplanting operations, the above-mentioned sweet potato seedling tray (i.e. bare seedling tray) needs to be continuously produced. Therefore, it is necessary to realize the process of fixing the sweet potato seedlings at equal intervals between two layers of film and winding the two layers of film with the sweet potato seedlings to form a sweet potato seedling tray. In the implementation process, the process of separately unwinding the two layers of film and winding the two layers of film containing the sweet potato seedlings after the sweet potato seedlings are placed and fixed needs to be performed.

[0005] As in the prior art, patent CN118953794A provides a root-stemmed Chinese herbal medicine seedling automatic separation, packaging, and winding machine and its operation mode. It provides a rack, a seedling separation device, a seedling taking device, a conveying device, a hot melt packaging device, a pressing device, and a winding device, which integrates separation, conveying, identification, packaging, and winding. It can realize the single separation of the root-stemmed Chinese herbal medicine seedlings accumulated in a bundle, the release of the upper seedling tape and the lower seedling tape, and the automatic hot melt packaging and winding operation of the medicine seedling tape. The hot melt is performed by a sheet-shaped ceramic hot melt sheet, which melts two one-letter-shaped strip-shaped fusion tapes on the seedling tape. This strip-shaped fusion tape is easy to break when the seedling tape is subjected to a large pulling force, and the upper and lower seedling tapes are not easy to separate. This strip-shaped fusion tape is easy to break when the seedling tape is subjected to a large pulling force. Therefore, in the production process, if the film tension control is not proper, it is easy to cause damage or breakage of the upper and lower films, affecting the subsequent transplanting operations. The unwinding and winding of the film need to be effectively controlled to ensure the continuous stability of the production. SUMMARY

[0006] Invention purposes: In order to overcome the deficiencies in the prior art, the present application provides a layered multi-resistance film release and film winding mechanism for mechanized transplanting bare seedling tape production, which can fully adapt to the production characteristics of bare seedling tape, effectively manage the upper and lower films, and prevent damage or breakage caused by improper tension control of the films.

[0007] Technical scheme: To achieve the above-mentioned purposes, the layered multi-resistance film release and film winding mechanism for mechanized transplanting bare seedling tape production of the present application comprises a rack, first film release devices and winding devices are respectively installed at the front and rear ends of the rack, a second film release device is installed at the middle of the rack, the lower film and the upper film released by the first film release device and the second film release device are stacked and can be wound by the winding device, 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 rack, the first film release device comprises an electromagnetic damper acting on its first rotating shaft, and further comprises a first self-adaptive tension adjusting device, the lower film roll is fixed on the first rotating shaft by a mechanical tensioner, and the lower film released by the first film release device passes through the first self-adaptive tension adjusting device and the fixed-length film feeding device in sequence.

[0009] The second film release device comprises a damping device acting on its second rotating shaft, and further comprises a second self-adaptive tension adjusting device, the upper film roll is fixed on the second rotating shaft by a mechanical tensioner, a film pressing device is also installed on the rack and located at the rear side of the second film release device, and the upper film released by the second film release device passes through the second self-adaptive tension adjusting device and the film pressing device in sequence.

[0010] The above-mentioned layered multi-resistance film release and film winding mechanism is used in the production of bare seedling tape, aiming to clamp the bare seedlings between the upper film and the lower film, and perform ironing sealing work on both sides of each bare seedling, forming two rows of ironing points on both sides of the bare seedling, and the upper film and the lower film are heated and adhered together at each ironing point, so that the bare seedlings will not fall off from the upper film and the lower film.

[0011] In actual use, a conveying belt is installed on the rack, bare seedling positioning devices are installed at equal intervals on the conveying belt, the lower film released by the first film release device is laid flat on the upper surface of the conveying belt, and the conveying belt and the lower film can move at the same speed through the cooperation of the fixed-length film feeding device and the winding device, since there is a long distance between the first film release device and the second film release device, bare seedlings can be placed on the bare seedling positioning devices, and the bare seedlings are located on the upper surface of the lower film; when the bare seedling positioning devices pass through the film pressing device under the drive of the conveying belt, the upper film covers the bare seedlings, and the ironing sealing work can be performed on the bare seedlings between the film pressing device and the winding device.

[0012] The layered multi-resistance film roll film mechanism fully adapts to the characteristics of bare seedling tape production. The film feeding and winding device can realize synchronous movement of the film and the conveying belt, and prevent the film from being damaged or wrinkled due to long-distance pulling of the winding device. The electromagnetic damper can increase the rotational resistance of the film roll installed on the first film feeding device, and the first self-adaptive tension adjusting device can keep the film in a taut state, prevent the film from being loosened due to the reverse rotation of the film roll, and prevent the film from being damaged. The damping device can make the upper film roll on the second rotating shaft in a state of micro-resistance and inertia-free rotation, and the second self-adaptive tension adjusting device can make the motor between the second self-adaptive tension adjusting device and the winding device in a moderate taut state. The resistance of the damping device can be manually adjusted as needed to prevent tearing of the sealant.

[0013] Further, the first film feeding device further comprises a first support, and the first rotating shaft is rotatably installed on the first support. A first fixed gear is rotatably installed on the first support. The first self-adaptive tension adjusting device comprises a first rod rotatably installed relative to the first support, a first driving gear installed at an end of the first rod, and a first spring connecting the first rod and the first support. The first spring and the first rotating shaft are located on the same side of the first rod, and the first driving gear is located on the other side of the first rod. The film released by the film roll passes through the first fixed gear and the first driving gear in turn, and then passes through the fixed-length film feeding device, so that the film between the film roll and the fixed-length film feeding device is in an S shape. In this way, the film can be self-adaptively tensioned, and the film can be prevented from wrinkling.

[0014] Preferably, an angular displacement sensor is provided between the first rod and the first support to detect the relative angle therebetween. When the relative angle exceeds the maximum value of a preset threshold range, it indicates that the damping of the electromagnetic damper is too large, and 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, and therefore the control system increases the operating current of the electromagnetic damper to increase the current.

[0015] Further, the fixed-length film feeding device comprises a lower clamping wheel, an upper clamping wheel, an adjusting mechanism for changing the height of the upper clamping wheel, and a film feeding motor for driving the lower clamping wheel. The upper clamping wheel can be lifted by the adjusting mechanism to facilitate film threading, and the upper clamping wheel can be lowered to clamp the film.

[0016] Further, the second film placing device further comprises a second support, the second rotating shaft is rotatably installed on the second support, and the second fixed gear is rotatably installed on the second support; the second self-adaptive tension adjusting device comprises a second rod rotatably installed relative to the second support, a second driving gear installed on an end of the second rod, and a second spring connecting the second rod and the second support. The second spring is located on the same side of the second rod as the second rotating shaft, and the second driving gear is located on the other side of the second rod. The upper film released from the film roll passes through the second fixed gear and the second driving gear in sequence and then passes through the film pressing device, so that the upper film between the film roll and the film pressing device is in an S shape. In this way, the self-adaptive tension of the upper film can be realized, and the upper film is prevented from being wrinkled.

[0017] Further, the damping device comprises an adjusting seat installed on the second support, and further comprises a damping pressing plate fixed on the adjusting seat and acting on the second rotating shaft. The damping pressing plate has an arc surface matched with the second rotating shaft; by adjusting the adjusting seat, the force of the damping pressing plate acting on the second rotating shaft can be changed, that is, the friction between the two can be changed, so that the resistance of the second rotating shaft can be adjusted, and thus the nonlinear feature of the release length of the upper film caused by the bulging of the upper film due to the clamping of the bare seedling between the upper mold and the lower mold can be adapted.

[0018] Further, the two film pressing devices are installed on the frame, and a wheel set is located at the rear end of the frame. A sealing device for sealing the upper film and the lower film is located between the two groups of film pressing devices, and the sealing device has two rows of sealing columns arranged in a horn shape. The end of the sealing column acts on the upper film and the lower film to form two rows of sealing points arranged in a horn shape. The upper film and the lower film are fused and adhered to each other at the position of each sealing point, and the distance between the sealing points near the two sides of the tail part of the bare seedling is short, and the distance between the sealing points near the two sides of the head part of the bare seedling is long. In this way, the shape feature of the bare seedling is adapted, the bare seedling can be prevented from falling off, and the upper film and the lower film can not be broken after being peeled off. The wheel set comprises three redirecting wheels arranged in a triangular shape. The upper film and the lower film between the rear film pressing device and the winding device are in an S shape.

[0019] Preferably, one of the redirecting wheels of the wheel set is slidingly 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. 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 matching role. The stable operation of the system can be realized through the cooperative work of the two, and the tension of the upper film and the lower film is reasonably ensured.

[0020] Beneficial effects: The layered multi-resistance film unwinding mechanism for mechanized bare seedling strip production of the application fully adapts to the characteristics of bare seedling strip production, and through cooperation of the fixed-length film feeding device and the winding device, the layered multi-resistance film unwinding mechanism can realize synchronous movement of the film and the conveying belt, and prevent the winding device from causing damage or wrinkles to the film due to long-distance pulling. The electromagnetic damper can increase the rotational resistance of the film roll installed on the first film unwinding device, and in combination with the first self-adaptive tension adjusting device, the layered multi-resistance film unwinding mechanism can keep the film in a taut state, prevent the film roll from reversing and causing the film to relax, and prevent the film from being damaged. The damping device can keep the upper film roll on the second rotating shaft in a state of micro-resistance and inertia-free rotation, and in cooperation with the second self-adaptive tension adjusting device, the layered multi-resistance film unwinding mechanism can keep the motor between the second self-adaptive tension adjusting device and the winding device in a moderate taut state. The resistance of the damping device can be manually adjusted as needed to prevent tearing of the sealant during sealing. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a structural diagram of the layered multi-resistance film unwinding mechanism for mechanized bare seedling strip production.

[0022] Figure 2 It is a top view structural diagram of the layered multi-resistance film unwinding mechanism for mechanized bare seedling strip production (including a conveying belt, a sealing device, and a bare seedling positioning device).

[0023] Figure 3 It is a structural diagram of the first film unwinding device.

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

[0025] Figure 5 It is a structural diagram of the second film unwinding device.

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

[0027] Figure 7 It is a structural diagram of the fixed-length film feeding device.

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

[0029] Figure 9 It is a combined schematic diagram of the bare seedling and the upper and lower films after completion of sealing.

[0030] In the diagram: 1-Frame; 2-First film feeding device; 21-First rotating shaft; 22-Electromagnetic damper; 23-First adaptive tension adjustment device; 23a-First rod; 23b-First moving wheel; 23c-First spring; 24-First support; 25-First fixed wheel; 3-Rewinding device; 4-Second film feeding device; 41-Second rotating shaft; 42-Damping device; 42a-Damping pressure plate; 42b-Adjusting seat; 43-Second adaptive tension adjustment device; 43a-Second rod; 43b-Second moving wheel; 43c-Second spring; 44-Second bracket; 45-Second fixed wheel; 46-Adjusting seat; 5-Rewinding 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 Implementation

[0031] The invention will now be further described with reference to the accompanying drawings.

[0032] like Figure 1 The layered multi-obstruction film-laying and rolling mechanism shown is used for the production of mechanized transplanted bare seedlings. It includes a frame 1, with a first film-laying device 2 and a winding device 3 installed at the front and rear ends of the frame 1, respectively; a second film-laying device 4 is installed in the middle of the frame 1; the lower and upper films released by the first film-laying device 2 and the second film-laying device 4 are stacked and can be wound up by the winding device 3, and the winding device 3 is driven by a winding motor 5.

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

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

[0035] The layered multi-resistance film unwinding and rolling mechanism is used in the production of bare seedling tape, aims to clamp the bare seedling between the upper film and the lower film, and perform hot sealing operation on both sides of each bare seedling, forming two rows of hot sealing points on both sides of the bare seedling, and the upper film and the lower film are heated and adhered together at each hot sealing point, so that the bare seedling cannot fall off from the upper film and the lower film.

[0036] In actual use, as shown in the figure, Figure 2 The conveying belt 10 is installed on the rack 1, the bare seedling positioning device 9 is installed equidistantly on the conveying belt 10, the lower film released by the first film unwinding device 2 is laid on the upper surface of the conveying belt, and the conveying belt and the lower film can move at the same speed through the cooperation of the constant-length film feeding device 6 and the winding device 3. Because there is a long distance between the first film unwinding device 2 and the second film unwinding device 4, the bare seedling can be placed on the bare seedling positioning device, and the bare seedling is 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 conveying belt 10, the upper film covers the bare seedling, so that the bare seedling can be hot sealed between the film pressing device 7 and the winding device 3.

[0037] The layered multi-resistance film unwinding and rolling mechanism fully adapts to the characteristics of bare seedling tape production, and the constant-length film feeding device 6 and the winding device 3 can realize synchronous movement of the lower film and the conveying belt 10, and prevent the winding device 3 from causing damage or wrinkles to the lower film due to long-distance pulling. The electromagnetic damper 22 can increase the rotational resistance of the lower film roll a installed on the first film unwinding device 2, and the first self-adaptive tension adjusting device 23 can keep the lower film in a taut state, prevent the lower film from relaxing due to the reverse rotation of the lower film roll, and prevent the lower film from being damaged. The damping device 42 can make the upper film roll b on the second rotating shaft 41 rotate in a state of slight resistance and no inertia, and the second self-adaptive tension adjusting device 43 can make the motor between the second self-adaptive tension adjusting device 43 and the winding device 3 in a moderate taut state. The resistance of the damping device 42 can be manually adjusted as needed to prevent tearing of the hot sealing point.

[0038] Preferably, as shown in the figure, Figure 3As shown, the first film unwinding device 2 further comprises a first support 24, the first rotating shaft 21 being rotatably installed on the first support 24, and a first fixed gear 25 being rotatably installed on the first support 24; the first self-adaptive tension adjusting device 23 comprises a first rod 23a rotatably installed relative to the first support 24, a first driving gear 23b installed on an end of the first rod 23a, and a first spring 23c connecting the first rod 23a and the first support 24. The first spring 23c is located on the same side of the first rod 23a as the first rotating shaft 21, and the first driving gear 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 gear 25 and the first driving gear 23b in turn 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 in an S shape. In this way, the self-adaptive tension of the lower film can be realized, and the lower film can be prevented from wrinkling.

[0039] Preferably, an angular displacement sensor is arranged between the first rod 23a and the first support 24 to detect the relative angle therebetween. When the relative angle therebetween exceeds the maximum value of a preset threshold range, it indicates that the damping of the electromagnetic damper 22 is too large, and thus 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 relatively small, and thus the control system increases the operating current of the electromagnetic damper 22 to increase the damping.

[0040] Preferably, as shown in Figure 7 As shown, the fixed-length film feeding device 6 comprises a lower clamping wheel 61, an upper clamping wheel 62, an adjusting mechanism 63 for changing the height of the upper clamping wheel 62, and a film feeding motor 64 for driving the lower clamping wheel 61 to operate. The upper clamping wheel 62 can be lifted by the adjusting mechanism 63 to facilitate film threading, and the upper clamping wheel 62 can be lowered to clamp the lower film.

[0041] Preferably, as shown in Figure 5 As shown, the second film unwinding device 4 further comprises a second support 44, the second rotating shaft 41 being rotatably installed on the second support 44, and a second fixed gear 45 being rotatably installed on the second support 44; the second self-adaptive tension adjusting device 43 comprises a second rod 43a rotatably installed relative to the second support 44, a second driving gear 43b installed on an end of the second rod 43a, and a second spring 43c connecting the second rod 43a and the second support 44. The second spring 43c is located on the same side of the second rod 43a as the second rotating shaft 41, and the second driving gear 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 gear 45 and the second driving gear 43b in turn 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 in an S shape. In this way, the self-adaptive tension of the upper film can be realized, and the upper film can be prevented from wrinkling.

[0042] Preferably, the damping device 42 includes an adjusting seat 42b mounted on the second bracket 44, and a damping pressure plate 42a fixed on the adjusting seat 42b and acting on the second rotating shaft 41. The damping pressure plate 42a has an arc-shaped surface that matches the second rotating shaft 41; by adjusting the adjusting seat 46, the force of the damping pressure plate 42a acting on the second rotating shaft 41 can be changed, that is, the frictional force between the two can be changed, thus realizing the adjustment of the resistance of the second rotating shaft 41. This can adapt to the nonlinear characteristics of the upper film bulging caused by the clamping of bare seedlings between the upper and lower molds, resulting in the release length of the upper film.

[0043] Preferably, the frame 1 is equipped with two film pressing devices 7, one at the front and one at the rear, and also includes a wheel set 8 located at the rear end of the frame 1. A heat sealing device 11 for heat sealing the upper and lower films is located between the two film pressing devices 7, such as... Figure 8 As shown, the hot stamping device 11 has two rows of hot stamping posts 11a arranged in a trumpet shape. The ends of the hot stamping posts 11a act on the upper and lower films to form two rows of hot stamping points arranged in a trumpet shape (e.g., Figure 9 As shown, at each heat-pressing point, the upper and lower films are fused and adhered to each other. The heat-pressing points near the tail of the bare seedling are close together, while those near the head of the seedling are farther apart. This adapts to the shape characteristics of the bare seedling, preventing it from falling off. The multiple heat-pressing points also facilitate the subsequent peeling of the upper and lower films to release the seedling, and the films are less prone to breakage after peeling. The wheel assembly 8 includes three deflector wheels 81 arranged in a triangular pattern. The upper and lower films between the pressing device 7 and the winding device 3 at the rear are S-shaped. The heat sealing device 11 also has a protective member 11b with a funnel-shaped groove at the bottom. The protective member 11b is located between two rows of heat-sealing columns 11a, and there is a gap between the outer wall of the protective member 11b and the heat-conducting seat 11c of the heat sealing device 11. During heat sealing, the protective member 11b holds the bare seedling inside through the upper film to prevent the bare seedling from being burned. The protective member 11b can elastically float 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 heat-sealing column 11a contacts the upper film to ensure the firmness of the heat-sealing point.

[0044] Preferably, one of the redirecting wheels 81 of the wheel set 8 is slidably mounted 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; 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 precisely controlled by the fixed-length film feeding device 6, while the winding motor 5 plays a supporting role. The coordinated operation of the two can achieve stable operation of the system and ensure reasonable tension between the upper and lower films.

[0045] The above merely describes the preferred embodiments of the present application, and it should be pointed out that those skilled in the art can make several improvements and refinements without departing from the principles of the present application, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A layered multi-resistance film release and winding mechanism for mechanized production of bare seedling tape, comprising a frame (1), first film release device (2) and winding device (3) are respectively installed at the front and rear ends of the frame (1); a second film release device (4) is installed at the middle of the frame (1); the lower film and the upper film released by the first film release device (2) and the second film release device (4) are stacked and can be wound by the winding device (3), and the winding device (3) is driven to operate by a winding motor (5); characterized in that: a fixed-length film feeding device (6) is further installed at the front end of the frame (1); the first film release device (2) comprises an electromagnetic damper (22) acting on its first rotating shaft (21), and further comprises a first self-adaptive tension adjusting device (23); the lower film released by the first film release device (2) passes through the first self-adaptive tension adjusting device (23) and the fixed-length film feeding device (6) in turn; the second film release device (4) comprises a damping device (42) acting on its second rotating shaft (41), and further comprises a second self-adaptive tension adjusting device (43); a film pressing device (7) is further installed on the frame (1) at the rear side of the second film release device (4), and the upper film released by the second film release device (4) passes through the second self-adaptive tension adjusting device (43) and the film pressing device (7) in turn; The layered multi-resistance film release and winding mechanism is used in the production of bare seedling tape, for clamping sweet potato seedlings between the upper film and the lower film, and performing sealing work on both sides of each sweet potato seedling to form two rows of sealing points on both sides of the sweet potato seedling, and the upper film and the lower film are heated and adhered together at each sealing point; In use, a conveying belt (10) is installed on the frame (1), and sweet potato seedling positioning devices (9) are installed at equal intervals on the conveying belt (10); the lower film released by the first film release device (2) is laid flat on the upper surface of the conveying belt, and the conveying belt and the lower film move at the same speed through the cooperation of the fixed-length film feeding device (6) and the winding device (3); the sweet potato seedlings are placed between the first film release device (2) and the second film release device (4) on the sweet potato seedling positioning devices, and the sweet potato seedlings are located on the upper surface of the lower film; when the sweet potato seedling positioning devices (9) pass through the film pressing device (7) under the drive of the conveying belt (10), the upper film covers the sweet potato seedlings, and the sweet potato seedlings are sealed between the film pressing device (7) and the winding device (3). The first film release device (2) further comprises a first bracket (24), and a first fixed wheel (25) is rotatably installed on the first bracket (24); the first self-adaptive tension adjusting device (23) comprises a first rod (23a) rotatably installed relative to the first bracket (24), a first driving wheel (23b) installed at the end of the first rod (23a), and a first spring (23c) connecting the first rod (23a) and the first bracket (24).

2. The layered multi-resistance film release film roll mechanism for production of mechanized transplanted bare seedling tape according to claim 1, characterized by, ​ 3. The layered multi-resistance film release film roll mechanism for production of mechanized transplanted bare seedling tape according to claim 1, characterized by, The fixed-length film feeding device (6) comprises a lower clamping wheel (61), an upper clamping wheel (62), an adjusting mechanism (63) for changing the height of the upper clamping wheel (62), and a film feeding motor (64) for driving the lower clamping wheel (61) to rotate.

4. The layered multi-resistance film release film roll mechanism for production of mechanized transplanted bare seedling tape according to claim 1, characterized by, The second film feeding device (4) further comprises a second support (44) on which a second fixed wheel (45) is rotatably installed; the second self-adaptive tension adjusting device (43) comprises a second rod (43a) rotatably installed relative to the second support (44), a second driving wheel (43b) installed at the end of the second rod (43a), and a second spring (43c) connecting the second rod (43a) and the second support (44).

5. The layered multi-resistance film release film unwinding mechanism for production of mechanized bare seedling tape according to claim 4, characterized in that, The damping device (42) comprises an adjusting seat (42b) installed on the second support (44), and further comprises a damping pressing plate (42a) fixed on the adjusting seat (42b) and acting on the second rotating shaft (41).

6. The layered multi-resistance film release film unwinding mechanism for production of mechanized transplanted bare seedling tape according to claim 1, wherein, The machine frame (1) is provided with two front and rear film pressing devices (7), and further comprises a wheel set (8) located at the rear end of the machine frame (1).

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