A mechanized transplanting machine and method for bare seedlings with automatic hot-film wrapping

Abstract

This invention discloses an automatic hot-film sealing and winding machine and method for mechanized transplanting of bare seedlings. The winding machine includes a frame, on which a bare seedling conveying device, a seedling tape unwinding and winding device, a hot-sealing mechanism, and a control system are mounted. The seedling tape unwinding and winding device includes a lower film release component, a fixed-length film release component, an upper film release component, a flexible pressing wheel component, a film pressing component, and a winding component. The bare seedling conveying device includes a conveyor belt and multiple positioning mechanisms for positioning the bare seedlings, equidistantly installed on the conveyor belt. The hot-sealing mechanism is located between the flexible pressing wheel component and the film pressing component. The hot-sealing mechanism includes a lifting seat and two rows of hot-sealing columns arranged in a trumpet shape mounted on the lifting seat, with a partition plate having a trumpet-shaped open groove at the bottom installed between the two rows of hot-sealing columns. This invention not only improves production efficiency and product quality but also ensures the stability and accuracy of the bare seedlings during the hot-sealing process.

Description

Technical Field

[0001] This invention relates to the field of production technology of bare seedling tape for transplanting machines, and in particular to an automatic hot-filming and winding machine and method for mechanized bare seedling tape for transplanting. Background Technology

[0002] In modern agricultural production, the application of seedling strip transplanting technology for transplanting bare seedlings has many advantages and has been widely used in the planting of crops such as sweet potatoes, medicinal herbs, large rice seedlings, and large rapeseed seedlings. Bare seedlings refer to seedlings that are not wrapped in substrate or soil during transplanting. Taking sweet potatoes as an example, the applicant's prior application CN118451865A, etc., demonstrates a machine for transplanting bare sweet potato seedlings using sweet potato seedling strips. The sweet potato seedling strip consists of two films and sweet potato seedlings equidistantly clamped between the two films. During use, the two films are peeled apart, causing the sweet potato seedlings to detach.

[0003] In the prior art, application number CN 118953794 A provides an automatic separation, packaging, and winding machine for root and rhizome medicinal herb seedlings and its operation method. This patent integrates separation, conveying, identification, packaging, and winding, and can realize the individual separation of root and rhizome medicinal herb seedlings stacked in bundles, completing the automatic packaging and winding operation of root and rhizome medicinal herb seedlings. This patented technology has the following problems when used for the production of seedling strips for bare seedlings with leaves, such as sweet potato seedlings:

[0004] (1) In this patent, hot-melt ceramic sheets are used to form two parallel hot-melt sealing strips between the upper and lower films on both sides of the seedling. This is not conducive to the peeling of the upper and lower films in subsequent use. Moreover, the fixing effect is poor for bare seedlings with many leaves, such as sweet potato seedlings. The bare seedlings are easy to move. During the peeling process, the upper and lower films are easy to break, which leads to the interruption of transplanting.

[0005] (2) In this patent, although the positioning device on the conveyor belt is suitable for Chinese medicinal seedlings with relatively regular shapes, its positioning effect is insufficient for seedlings with many leaves and irregular shapes, such as sweet potato seedlings. At the same time, the conveyor belt is easily damaged when the ceramic hot melt sheet is used for sealing, and the firmness of the seal is also difficult to be effectively guaranteed.

[0006] (3) High risk of membrane damage: During the production of sweet potato seedlings, improper control of membrane tension can easily cause damage or breakage of the upper and lower membranes, affecting subsequent transplanting operations. In particular, the upper membrane is in contact with the hot-melt ceramic sheet first. If there is a gap between the upper and lower membranes when the hot-melt ceramic sheet contacts the upper membrane, the upper membrane will break under tension. Summary of the Invention

[0007] Purpose of the invention: In order to overcome the shortcomings of the existing technology, the present invention provides a mechanized automatic hot-film rolling machine and method for transplanting bare seedling strips that can realize the automatic and stable production of bare seedling strips, ensure production quality, and facilitate subsequent transplanting operations.

[0008] Technical solution: To achieve the above objectives, the present invention provides an automatic hot-film wrapping and rolling machine for mechanized transplanting of bare seedlings, which includes a frame, wherein the frame has a bare seedling conveying device, a seedling wrapping and unwinding device, a hot-sealing mechanism, and a control system.

[0009] The seedling release and take-up device includes a lower film release assembly, a fixed-length film release assembly, an upper film release assembly, a flexible pressing wheel assembly, a film pressing assembly, and a take-up assembly arranged sequentially from front to back on the frame.

[0010] The bare seedling conveying device includes a conveyor belt and a plurality of positioning mechanisms for positioning the bare seedlings, which are equidistantly installed on the conveyor belt.

[0011] The hot stamping mechanism is located between the flexible pressing wheel assembly and the film pressing assembly; the hot stamping mechanism includes a lifting base and two rows of hot stamping columns arranged in a trumpet shape mounted on the lifting base, with a partition plate having a trumpet-shaped open slot installed between the two rows of hot stamping columns; the hot stamping mechanism also includes a lifting drive unit for driving the lifting base to rise and fall, the lifting drive unit may be an electric cylinder; a sensing sensor is provided on the frame at a position corresponding to the lower part of the hot stamping mechanism; the control system determines whether a positioning mechanism has reached the lower part of the hot stamping mechanism based on the data detected by the sensing sensor;

[0012] The positioning mechanism includes an upper positioning block and a lower positioning block. Each positioning block has a head positioning groove and a tail positioning groove, both of which have an upper V-shaped groove and a lower groove structure. The opening width and square groove width of the head positioning groove are both greater than those of the tail positioning groove. This conforms to the characteristic of bare seedlings having more branches and leaves at the head and fewer at the tail, enabling effective positioning of the bare seedlings. During operation, the lower film released by the lower film release component is placed between the upper and lower positioning blocks. Below the heat-sealing mechanism, the upper film, bare seedlings, and lower film are stacked sequentially. The flexible pressing roller assembly presses the laid-out lower film, bare seedlings, and upper film firmly to facilitate smooth entry into the heat-sealing device. After the lifting platform descends, the partition covers the bare seedlings and vines inside to prevent scalding and displacement. The two rows of scalding columns create two rows of funnel-shaped scalding points between the upper and lower films. At each scalding point, the upper and lower films melt and adhere together to fix the bare seedlings between the upper and lower films. This also facilitates the later peeling of the upper and lower films to release the bare seedlings for transplanting. After peeling the upper and lower films, the damage to each film is minimal and will not cause the films to break, thus not affecting the continuity of the transplanting operation.

[0013] The aforementioned structure, by integrating a bare seedling conveying device, a seedling strip release and collection device, a heat-sealing mechanism, and a control system, automates the production of bare seedling strips. This design not only improves production efficiency and product quality but also ensures the stability and accuracy of the bare seedlings during the heat-sealing process. In particular, the design of two rows of funnel-shaped heat-sealing columns combined with partitions effectively prevents the bare seedlings from shifting and being scalded, ensures a strong adhesion between the upper and lower films, facilitates subsequent peeling, reduces film damage, and ensures the continuity of transplanting operations.

[0014] Furthermore, the lower film release assembly includes a first support, a first shaft, an electromagnetic damper, and a first tension adjustment mechanism; the electromagnetic damper applies a damping torque to the first shaft. The first tension adjustment mechanism includes a first redirecting wheel rotatably mounted on the first support, and a first connecting rod rotatably mounted relative to the first support. A first movable wheel is mounted at the end of the first connecting rod, and a first tension spring connects the first connecting rod and the first support. The lower film roll is fixed relative to the first shaft, and the lower film released from the lower film roll passes sequentially around the first redirecting wheel and the first movable wheel before passing through the fixed-length film release assembly. The lower film between the lower film roll and the fixed-length film release assembly is S-shaped.

[0015] The fixed-length film feeding assembly includes two clamping wheels and a film feeding motor that drives one of the clamping wheels to rotate.

[0016] The lower membrane release assembly includes an electromagnetic damper and a tension adjustment mechanism to ensure that the lower membrane maintains appropriate tension during release, preventing slack or breakage. The electromagnetic damper applies a damping torque to the first axis, which, combined with the first tension adjustment mechanism, enables the lower membrane to be released smoothly and ensures that the fixed-length membrane release assembly can accurately supply the lower membrane.

[0017] Preferably, the first tension adjustment mechanism further includes an angular displacement sensor for monitoring the relative angle between the first connecting rod and the first support. When the angular displacement exceeds a preset threshold range, the control system adjusts the damping torque of the electromagnetic damper based on sensor feedback to maintain appropriate tension in the lower membrane. Specifically, when the angular displacement exceeds the maximum threshold, the control system reduces the operating current of the electromagnetic damper to decrease the damping force; when the angular displacement is below the minimum threshold, the control system increases the operating current of the electromagnetic damper to increase the damping force.

[0018] Furthermore, the upper film release assembly includes a second support, a second shaft, a damping device, and a second tension adjustment mechanism; the damping device applies a damping torque to the second shaft. The second tension adjustment mechanism includes a second redirecting wheel rotatably mounted on the second support, and a second connecting rod rotatably mounted relative to the second support. A second movable wheel is mounted at the end of the second connecting rod, and a second tension spring connects the second connecting rod and the second support. The upper film roll is fixed relative to the second shaft, and the upper film released from the upper film roll passes sequentially around the second redirecting wheel and the second movable wheel before passing through the flexible pressing wheel assembly. The upper film portion between the upper film roll and the flexible pressing wheel assembly is S-shaped.

[0019] The upper film release assembly adopts a similar structural design to the lower film release assembly, ensuring that the upper film maintains appropriate tension and stability during release. A damping torque is applied to the second shaft through a damping device, combined with a second tension adjustment mechanism, allowing the upper film to smoothly and accurately cover the bare seedlings.

[0020] Furthermore, the partition and lifting seat in the heat sealing mechanism are connected by multiple screws, and a compression spring is provided between the partition and the lifting seat. The compression spring is threaded onto the screws, allowing the partition to elastically float up and down relative to the screws. Additionally, a heat-conducting column is installed on the lifting seat to transfer heat to each heat-sealing column. This connection structure ensures that the lower edge of the partition can contact the upper and lower films before the heat-sealing column, pre-pressing them together. This design not only provides the necessary cushioning, allowing the partition to adapt to bare seedlings of different heights, but also ensures that the upper and lower films are firmly pressed together before the heat-sealing column is applied, thus facilitating the formation of precise heat-sealing points and improving the heat sealing effect and finished product quality. Furthermore, the compression spring design allows the partition to float up and down, further enhancing the equipment's adaptability to bare seedlings of different sizes and ensuring operational stability and reliability.

[0021] Furthermore, the positioning mechanism also includes an anti-rotation plate and a flexible pad. The anti-rotation plate connects the upper positioning block and the lower positioning block and is fixed to the conveyor belt with screws to prevent the positioning block from rotating and affecting the seedling clamping effect after long-term operation. The two flexible pads are placed on both sides of the anti-rotation plate and are heat-fused to the conveyor belt to prevent the heat-sealing unit from damaging the conveyor belt during the heat sealing process and to ensure that the ends of all heat-sealing units can evenly abut against the lower film to form a firm heat point.

[0022] Furthermore, the winding assembly includes three deflector rollers arranged in a triangle, a winding roller, and a winding motor that drives the winding roller. The deflector rollers not only adjust the film path, ensuring an S-shaped trajectory between the film pressing assembly and the winding roller, but also help maintain film tension, preventing wrinkles and loosening. The winding motor precisely controls the winding roller's operating speed, ensuring neat winding of the bare seedling tape, improving the finished product's appearance quality and ease of use.

[0023] The method for automatically rolling up bare seedlings with hot-pressed film during mechanized transplanting, based on the aforementioned automatic hot-pressed film rolling machine for bare seedlings during mechanized transplanting, includes the following steps:

[0024] Step 1), the lower membrane release assembly releases the lower membrane, and the release length of the lower membrane is precisely controlled by the fixed-length membrane release assembly;

[0025] The lower film passes sequentially through the first redirecting wheel and the first movable wheel, and is laid between the upper and lower positioning blocks of each positioning mechanism.

[0026] Step 2): Place the bare seedlings on the lower film manually or mechanically, and place the head and tail of the bare seedlings in the corresponding positioning slots of the upper positioning block and the lower positioning block, respectively.

[0027] Step 3): The upper film released by the upper film release assembly covers the bare seedling; the flexible pressing wheel assembly initially presses the upper and lower films together with the bare seedling to ensure that the film and the bare seedling are in close contact.

[0028] Step 4): When the sensing sensor detects that the positioning mechanism has reached below the hot-sealing mechanism, the control system starts the hot-sealing program.

[0029] The hot sealing process is as follows: the conveyor belt and the fixed-length film-laying assembly both stop running, the lifting drive unit drives the lifting seat to descend, the partition plate contacts the upper and lower films before the hot sealing column, and presses them in advance. At the same time, the partition plate covers the bare seedling vines to prevent scalding and displacement. Then, the two rows of hot sealing columns arranged in a trumpet shape press the upper and lower films against the flexible pad to form a firm hot sealing point.

[0030] Step 5): After the hot-sealing is completed, the lifting seat rises and resets, and the resulting bare seedling strip continues to move forward and is wound up by the winding assembly. Specifically, the deflector wheel in the winding assembly guides the hot-sealed bare seedling strip into the winding wheel, and the winding motor drives the winding wheel to neatly wind up the bare seedling strip; the control system adjusts the speed of the winding motor as needed to maintain appropriate tension and ensure winding quality.

[0031] Then, the conveyor belt and the fixed-length film-laying assembly continue to operate until the next positioning mechanism reaches below the hot-sealing mechanism, causing the sensor to generate a detection signal. This cycle continues, enabling continuous hot-sealing operations and continuous production of bare seedling tape.

[0032] The above method achieves full automation in the production of bare seedling tape through a series of coordinated steps. From laying the lower film, placing the bare seedlings, covering with the upper film, heat sealing, to the final winding of the finished product, each step is meticulously designed to ensure operational precision and consistency. In particular, the coordination of sensors and a control system enables precise control of the heat sealing timing, ensuring that each bare seedling is effectively sealed. This method not only improves production efficiency but also reduces the impact of human factors, enhances product quality and stability, and is suitable for large-scale continuous production environments.

[0033] Beneficial effects: The mechanized transplanting bare seedling automatic hot-film wrapping machine and method of the present invention have the following beneficial effects:

[0034] (1) The mechanized transplanting bare seedling tape automatic hot-film winding machine integrates a bare seedling conveying device, a seedling tape unwinding and rewinding device, a hot-sealing mechanism, and a control system, realizing the automation of bare seedling tape production. This design not only improves production efficiency and product quality but also ensures the stability and accuracy of the bare seedlings during the hot-sealing process. In particular, the design of two rows of trumpet-shaped hot-sealing columns combined with partitions effectively prevents the bare seedlings from shifting and being burned, ensures a firm adhesion between the upper and lower films, facilitates subsequent peeling, reduces film damage, and ensures the continuity of transplanting operations.

[0035] (2) The automated hot-film sealing and winding method for mechanized transplanting of bare seedlings achieves full automation in the production of bare seedling tapes through a series of coordinated steps. From laying the lower film, placing the bare seedlings, covering with the upper film, hot-sealing, to the final winding of the finished product, each step is carefully designed to ensure the precision and consistency of the operation. In particular, through the cooperation of sensors and control systems, precise control of the hot-sealing timing is achieved, ensuring that each bare seedling is effectively sealed. This method not only improves production efficiency but also reduces the impact of human factors, enhances product quality and stability, and is suitable for large-scale continuous production environments.

[0036] (3) The technology of the present invention is applicable to the hot-sealing and rolling of naked seedlings of crops such as sweet potatoes, Chinese medicinal materials, rice seedlings, and rapeseed seedlings. Attached Figure Description

[0037] Figure 1 A side view of the structure of a bare seedling with automatic hot-film wrapping and winding machine for mechanized transplanting;

[0038] Figure 2 A top view of the structure of a bare seedling with automatic hot-film wrapping and winding machine for mechanized transplanting;

[0039] Figure 3 This is a structural diagram of the rear side of the frame;

[0040] Figure 4 This is a three-dimensional structural diagram of the hot stamping mechanism;

[0041] Figure 5 This is a front view of the hot stamping mechanism.

[0042] Figure 6 Here is a structural diagram of the positioning mechanism;

[0043] Figure 7 This is the structural diagram of the first tightening adjustment mechanism;

[0044] Figure 8 This is a structural diagram of the second tightening adjustment mechanism;

[0045] Figure 9 This is a structural diagram of a finished seedling tray made by winding bare seedlings.

[0046] In the diagram: 1-Frame; 2-Hot sealing mechanism; 21-Lifting seat; 22-Hot sealing column; 23-Lifting drive unit; 24-Baffle; 25-Screw; 26-Compression spring; 27-Heat guiding column; 3-Lower film release assembly; 31-First shaft; 32-Electromagnetic damper; 33-First tension adjustment mechanism; 33a-First redirecting wheel; 33b-First connecting rod; 33c-First movable wheel; 33d-First tension spring; 34-First stand; 4-Fixed length film release assembly; 41-Film release motor; 5-Upper film release assembly; 51 - Second shaft; 52- Damping device; 53- Second tension adjustment mechanism; 53a- Second redirecting wheel; 53b- Second connecting rod; 53c- Second movable wheel; 53d- Second tension spring; 54- Second stand; 6- Flexible pressing wheel assembly; 7- Film pressing assembly; 8- Winding assembly; 81- Redirecting wheel; 82- Winding wheel; 83- Winding motor; 9- Positioning mechanism; 91- Upper positioning block; 91a- Head positioning groove; 92- Lower positioning block; 92a- Tail positioning groove; 10- Conveyor belt; 20- Control system. Detailed Implementation

[0047] The invention will now be further described with reference to the accompanying drawings.

[0048] like Figure 1 and Figure 2 The mechanized transplanting bare seedling tape automatic hot-film wrapping and winding machine shown includes a frame 1, on which a bare seedling conveying device, a seedling tape unloading and reloading device, a hot-sealing mechanism 2, and a control system 20 are provided.

[0049] The seedling release and take-up device includes a lower film release assembly 3, a fixed-length film release assembly 4, an upper film release assembly 5, a flexible pressing wheel assembly 6, a film pressing assembly 7, and a take-up assembly 8 arranged sequentially from front to back on the frame 1.

[0050] The bare seedling conveying device includes a conveyor belt 10 and a plurality of positioning mechanisms 9 equidistantly installed on the conveyor belt 10 for positioning the bare seedlings;

[0051] like Figure 3 As shown, the heat sealing mechanism 2 is located between the flexible pressing roller assembly 6 and the film pressing assembly 7; Figure 4 and Figure 5 As shown, the hot stamping mechanism 2 includes a lifting base 21 and two rows of hot stamping columns 22 arranged in a trumpet shape mounted on the lifting base 21. A partition 24 with a trumpet-shaped opening groove is installed between the two rows of hot stamping columns 22. The hot stamping mechanism 2 also includes a lifting drive unit 23 for driving the lifting base 21 to rise and fall. The lifting drive unit 23 can be an electric cylinder. A sensing sensor is provided on the frame 1 at a position corresponding to the lower part of the hot stamping mechanism 2. The control system determines whether the positioning mechanism 9 has reached the lower part of the hot stamping mechanism 2 based on the data detected by the sensing sensor.

[0052] like Figure 6 As shown, the positioning mechanism 9 includes an upper positioning block 91 and a lower positioning block 92. Each positioning block has a head positioning groove 91a and a tail positioning groove 92a. Both the head positioning groove 91a and the tail positioning groove 92a have an upper V-shaped groove and a lower groove structure. The opening width and square groove width of the head positioning groove 91a are both greater than the opening width and square groove width of the tail positioning groove 92a. This conforms to the characteristic of bare seedlings having more branches and leaves at the head and fewer branches and leaves at the tail, enabling effective positioning of the bare seedlings. During operation, the lower film released by the lower film release component 3 is placed between the upper positioning block 91 and the lower positioning block 92. Below the heat sealing mechanism 2, the upper film, bare seedlings, and lower film are stacked sequentially. The flexible pressing wheel component 6 presses the laid-out lower film, bare seedlings, and upper film firmly to facilitate smooth entry into the heat sealing device. After the lifting seat 21 descends, the partition 24 covers the bare seedlings and vines inside to prevent scalding and displacement. The two rows of scalding columns 22 form two rows of funnel-shaped scalding points between the upper and lower films. At each scalding point, the upper and lower films melt and stick together to fix the bare seedlings between the upper and lower films. This also facilitates the later peeling of the upper and lower films to release the bare seedlings for transplanting. After the upper and lower films are peeled off, the damage to each film is minimal and will not cause the films to break, thus not affecting the continuity of the transplanting operation.

[0053] The aforementioned structure, by integrating a bare seedling conveying device, a seedling strip release and collection device, a heat-sealing mechanism, and a control system, automates the production of bare seedling strips. This design not only improves production efficiency and product quality but also ensures the stability and accuracy of the bare seedlings during the heat-sealing process. In particular, the design of two rows of funnel-shaped heat-sealing columns combined with partitions effectively prevents the bare seedlings from shifting and being scalded, ensures a strong adhesion between the upper and lower films, facilitates subsequent peeling, reduces film damage, and ensures the continuity of transplanting operations.

[0054] Preferably, such as Figure 7As shown, the lower film release assembly 3 includes a first support 34, a first shaft 31, an electromagnetic damper 32, and a first tension adjustment mechanism 33; the electromagnetic damper 32 applies a damping torque to the first shaft 31. The first tension adjustment mechanism 33 includes a first deflector wheel 33a rotatably mounted on the first support 34, and a first connecting rod 33b rotatably mounted relative to the first support 34. A first movable wheel 33c is mounted at the end of the first connecting rod 33b, and a first tension spring 33d is connected between the first connecting rod 33b and the first support 34; the lower film roll is fixed relative to the first shaft 31, and the lower film released from the lower film roll passes sequentially around the first deflector wheel 33a and the first movable wheel 33c before passing through the fixed-length film release assembly 4. The lower film between the lower film roll and the fixed-length film release assembly 4 is S-shaped.

[0055] The fixed-length film feeding assembly 4 includes two clamping wheels and a film feeding motor 41 that drives one of the clamping wheels to rotate.

[0056] The lower membrane release assembly 3 includes an electromagnetic damper and a tension adjustment mechanism to ensure that the lower membrane maintains appropriate tension during release, preventing slack or breakage. The electromagnetic damper 32 applies a damping torque to the first shaft, which, in conjunction with the first tension adjustment mechanism 33, enables the lower membrane to be released smoothly and ensures that the fixed-length membrane release assembly 4 can accurately supply the lower membrane.

[0057] Preferably, the first tension adjustment mechanism 33 further includes an angular displacement sensor for monitoring the relative angle between the first connecting rod 33b and the first support 34. When the angular displacement exceeds a preset threshold range, the control system adjusts the damping torque of the electromagnetic damper 32 based on sensor feedback to maintain appropriate tension in the lower membrane. Specifically, when the angular displacement exceeds the maximum threshold, the control system reduces the operating current of the electromagnetic damper 32 to decrease the damping force; when the angular displacement is below the minimum threshold, the control system increases the operating current of the electromagnetic damper 32 to increase the damping force.

[0058] Preferably, such as Figure 8 As shown, the upper film release assembly 5 includes a second support 54, a second shaft 51, a damping device 52, and a second tension adjustment mechanism 53; the damping device 52 applies a damping torque to the second shaft 51. The second tension adjustment mechanism 53 includes a second redirecting wheel 53a rotatably mounted on the second support 54, and a second connecting rod 53b rotatably mounted relative to the second support 54. A second movable wheel 53c is mounted at the end of the second connecting rod 53b, and a second tension spring 53d connects the second connecting rod 53b and the second support 54. The upper film roll is fixed relative to the second shaft 51, and the upper film released from the upper film roll passes sequentially around the second redirecting wheel 53a and the second movable wheel 53c before passing through the flexible pressing wheel assembly 6. The upper film portion between the upper film roll and the flexible pressing wheel assembly 6 is S-shaped.

[0059] The upper film release assembly 5 adopts a similar structural design to the lower film release assembly 3, ensuring that the upper film maintains appropriate tension and stability during the release process. A damping torque is applied to the second shaft 51 by the damping device 52, which, combined with the second tension adjustment mechanism 53, allows the upper film to be smoothly and accurately covered onto the bare seedling.

[0060] Preferably, in the heat sealing mechanism 2, the partition 24 and the lifting seat 21 are connected by multiple screws 25, and a compression spring 26 is provided between the partition 24 and the lifting seat 21. The compression spring 26 is sleeved on the screws 25, allowing the partition 24 to elastically float up and down relative to the screws 25. Furthermore, a heat-conducting column 27 for transferring heat to each heat-sealing column 22 is installed on the lifting seat 21. This connection structure ensures that the lower edge of the partition 24 can contact the upper and lower films before the heat-sealing column 22, pre-pressing them together. This design not only provides the necessary buffer, allowing the partition 24 to adapt to bare seedlings of different heights, but also ensures that the upper and lower films are firmly pressed together before the heat-sealing column 22 is applied, thus facilitating the formation of precise heat-sealing points by the heat-sealing column 22, improving the heat sealing effect and product quality. In addition, the design of the compression spring 26 allows the partition 24 to float up and down, further enhancing the equipment's adaptability to bare seedlings of different sizes and ensuring operational stability and reliability.

[0061] Preferably, the positioning mechanism 9 further includes an anti-rotation plate 93 and a flexible pad 94. The anti-rotation plate 93 connects the upper positioning block 91 and the lower positioning block 92 and is fixed to the conveyor belt 10 by screws to prevent the positioning block from rotating and affecting the seedling clamping effect after long-term operation. The two flexible pads 94 are placed on both sides of the anti-rotation plate 93 and are heat-fused to the conveyor belt 10 to prevent the heat sealing unit 22 from damaging the conveyor belt 10 during the heat sealing process and to ensure that the ends of all heat sealing units 22 can evenly abut against the lower film to form a firm heat point.

[0062] Preferably, such as Figure 3As shown, the winding assembly 8 includes three triangularly arranged deflector rollers 81, a winding roller 82, and a winding motor 83 that drives the winding roller 82. The deflector rollers 81 not only adjust the film path, ensuring an S-shaped film path between the film pressing assembly 7 and the winding roller 82, but also help maintain film tension, preventing wrinkles and loosening. The winding motor 83 precisely controls the operating speed of the winding roller 82, ensuring neat winding of the bare seedling tape and improving the appearance quality and ease of use of the finished product. Preferably, one of the three deflector rollers 81 is slidably mounted relative to the frame 1, and a spring and a displacement sensor are provided between the deflector roller 81 and the frame 1. The displacement sensor monitors the positional changes of the deflector roller 81 and feeds the data back to the control system. When the tension of the upper and lower films changes significantly during winding, if the displacement exceeds a preset maximum displacement threshold, the control system controls the winding motor 83 to reduce its speed; if the displacement is less than a preset minimum displacement threshold, the control system controls the winding motor 83 to increase its speed. The displacement sensor monitors the position change of the deflector wheel 81 in real time and feeds the data back to the control system, so that the control system can dynamically adjust the speed of the winding motor 83 according to the actual tension, ensuring the stability of the winding process and the quality of the finished product.

[0063] The method for automatically rolling up bare seedlings with hot-pressed film during mechanized transplanting, based on the aforementioned automatic hot-pressed film rolling machine for bare seedlings during mechanized transplanting, includes the following steps:

[0064] Step 1), the lower membrane release assembly 3 releases the lower membrane, and the release length of the lower membrane is precisely controlled by the fixed-length membrane release assembly 4;

[0065] The lower film passes sequentially through the first redirecting wheel 33a and the first movable wheel 33c, and is laid between the upper positioning block 91 and the lower positioning block 92 of each positioning mechanism 9.

[0066] Step 2): Place the bare seedlings on the lower film manually or mechanically, and place the head and tail of the bare seedlings in the corresponding positioning slots of the upper positioning block 91 and the lower positioning block 92, respectively.

[0067] Step 3): The upper film released by the upper film release component 5 covers the bare seedling; the flexible pressing wheel component 6 initially presses the upper and lower films together with the bare seedling to ensure that the film and the bare seedling are in close contact.

[0068] Step 4): When the sensing sensor detects that the positioning mechanism 9 has reached below the hot-sealing mechanism 2, the control system starts the hot-sealing program.

[0069] The hot sealing process is as follows: both the conveyor belt 10 and the fixed-length film-laying assembly 4 stop running, the lifting drive unit 23 drives the lifting seat 21 to descend, the partition 24 contacts the upper and lower films before the hot sealing column 22, and presses them in advance. At the same time, the partition 24 covers the bare seedling vines to prevent scalding and displacement. Then, the two rows of hot sealing columns 22 arranged in a trumpet shape press the upper and lower films against the flexible pad 94 to form a firm hot sealing point.

[0070] Step 5): After the hot-sealing is completed, the lifting seat 21 rises and resets, and the resulting bare seedling strip continues to move forward and is wound up by the winding assembly 8. Specifically, the deflector wheel 81 in the winding assembly 8 guides the hot-sealed bare seedling strip into the winding wheel 82, and the winding motor 83 drives the winding wheel 82 to neatly wind up the bare seedling strip; the control system adjusts the speed of the winding motor 83 as needed to maintain appropriate tension and ensure winding quality. The wound bare seedling tray is as follows: Figure 9 As shown.

[0071] Then, the conveyor belt 10 and the fixed-length film-laying assembly 4 continue to operate until the next positioning mechanism 9 reaches below the hot-sealing mechanism 2, causing the sensor to generate a detection signal. This cycle continues, enabling continuous hot-sealing operations and continuous production of bare seedling tape.

[0072] The above method achieves full automation in the production of bare seedling tape through a series of coordinated steps. From laying the lower film, placing the bare seedlings, covering with the upper film, heat sealing, to the final winding of the finished product, each step is meticulously designed to ensure operational precision and consistency. In particular, the coordination of sensors and a control system enables precise control of the heat sealing timing, ensuring that each bare seedling is effectively sealed. This method not only improves production efficiency but also reduces the impact of human factors, enhances product quality and stability, and is suitable for large-scale continuous production environments.

[0073] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A mechanized transplanting bare seedling tape automatic hot-film wrapping and winding machine, comprising a frame (1), wherein the frame (1) has a bare seedling conveying device, a seedling tape unwinding and rewinding device, a hot-film sealing mechanism (2), and a control system (20); characterized in that: The seedling release and take-up device includes a lower film release assembly (3), a fixed-length film release assembly (4), an upper film release assembly (5), a flexible pressing wheel assembly (6), a film pressing assembly (7), and a take-up assembly (8) arranged sequentially from front to back on the frame (1). The bare seedling conveying device includes a conveyor belt (10) and a plurality of positioning mechanisms (9) that are equidistantly installed on the conveyor belt (10) to position the bare seedlings. The hot sealing mechanism (2) is located between the flexible pressing wheel assembly (6) and the film pressing assembly (7); the hot sealing mechanism (2) includes a lifting seat (21) and two rows of hot sealing columns (22) arranged in a trumpet shape installed on the lifting seat (21), and a partition plate (24) with a trumpet-shaped opening groove is installed between the two rows of hot sealing columns (22); the hot sealing mechanism (2) also includes a lifting drive unit (23) for driving the lifting seat (21) to lift; a sensing sensor is provided on the frame (1) at a position corresponding to the bottom of the hot sealing mechanism (2); the control system determines whether a positioning mechanism (9) has reached the bottom of the hot sealing mechanism (2) based on the data detected by the sensing sensor; a compression spring (26) is provided between the partition plate (24) and the lifting seat (21) so that the partition plate (24) can elastically float up and down relative to the screw (25); The positioning mechanism (9) includes an upper positioning block (91) and a lower positioning block (92), and the two positioning blocks have a head positioning groove (91a) and a tail positioning groove (92a) respectively. Both the head positioning groove (91a) and the tail positioning groove (92a) are structured as upper V-shaped groove and lower groove, and the opening width and square groove width of the head positioning groove (91a) are greater than the opening width and square groove width of the tail positioning groove (92a); during operation, the lower membrane released by the lower membrane release assembly (3) is placed between the upper positioning block (91) and the lower positioning block (92). The positioning mechanism (9) also includes an anti-rotation plate (93) and a flexible pad (94). The anti-rotation plate (93) connects the upper positioning block (91) and the lower positioning block (92) and is fixed to the conveyor belt (10) by screws. The two flexible pads (94) are placed on both sides of the anti-rotation plate (93) and are heat-fused to the conveyor belt (10).

2. The mechanized transplanting bare seedling automatic hot-film winding machine according to claim 1, characterized in that, The lower membrane release assembly (3) includes a first stand (34), a first shaft (31), an electromagnetic damper (32), and a first tension adjustment mechanism (33); the electromagnetic damper (32) applies a damping torque to the first shaft (31).

3. The mechanized transplanting bare seedling automatic hot-film winding machine according to claim 1, characterized in that, The upper membrane release assembly (5) includes a second stand (54), a second shaft (51), a damping device (52), and a second tension adjustment mechanism (53); the damping device (52) applies a damping torque to the second shaft (51).

4. The mechanized transplanting bare seedling automatic hot-film winding machine according to claim 1, characterized in that, The heat sealing mechanism (2) is connected to the partition (24) and the lifting seat (21) by a number of screws (25).

5. The mechanized transplanting bare seedling automatic hot-film winding machine according to claim 1, characterized in that, The winding assembly (8) includes three directional rollers (81) arranged in a triangular pattern, a winding roller (82), and a winding motor (83) that drives the winding roller (82) to operate.

6. A method for automatically rolling up bare seedlings with hot-pressed film for mechanized transplanting, based on the automatic hot-pressed film rolling machine for bare seedlings for mechanized transplanting as described in any one of claims 1-5, characterized in that, Includes the following steps: Step 1), the lower membrane release assembly (3) releases the lower membrane, and the release length of the lower membrane is precisely controlled by the fixed-length membrane release assembly (4); Step 2), place the bare seedlings on the lower film manually or mechanically, and place the head and tail of the bare seedlings in the corresponding positioning slots of the upper positioning block (91) and the lower positioning block (92) respectively; Step 3), the upper film released by the upper film release component (5) covers the bare seedling; Step 4), when the sensing sensor detects that the positioning mechanism (9) has reached below the hot sealing mechanism (2), the control system starts the hot sealing program; Step 5), after the hot sealing is completed, the lifting seat (21) rises and resets, and the formed bare seedling strip continues to move forward and is wound up by the winding component (8).

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