A new type of rice seedling tray forming device

Abstract

The application relates to the technical field of agricultural machinery, and discloses a novel rice seedling tray forming device, which comprises a fixed frame, a film roll arranged below the fixed frame, a film tensioning mechanism arranged at one end of the fixed frame, a conveying mechanism, a film punching mechanism, a heating mechanism, a roller forming mechanism and a cooling mechanism arranged in sequence along a conveying direction, the conveying mechanism is arranged in the fixed frame in a sequence of being horizontally extended from the discharging end of the film tensioning mechanism, being bent and then being arranged downwards, the film punching mechanism is adjustably arranged at the rear side of the output end of the film tensioning mechanism, and the heating mechanism is detachably fixedly connected with the fixed frame in an adjustable translation mode. The compact structure realizes uninterrupted and continuous tray production of the plastic roll, improves the quality of the finished seedling tray, reduces the raw material loss and flexibly adapts to the production of seedling trays with various specifications.

Description

Technical Field

[0001] This invention relates to the field of agricultural machinery technology, specifically to a novel rice seedling tray forming device. Background Technology

[0002] Plastic seedling trays for rice cultivation are key agricultural inputs for mechanized rice transplanting. Currently, the mainstream seedling tray forming equipment in China is divided into two categories: intermittent stamping forming equipment and closed oven-type vacuum forming equipment. Several technical defects have been exposed in actual production operations: Traditional equipment, such as the CN204800750U fully automatic multi-functional seedling tray machine, uses intermittent feeding of single-piece cut sheets. The feeding, heating, pressing, and discharging processes are interrupted in stages, resulting in wasted time during mold return. This limits the production line's capacity. Cutting the sheets generates a large amount of scrap material, leading to low raw material utilization. Furthermore, the dispersed structure of each functional module on a linear frame results in a long production line space and a large overall equipment space. Some existing roll-type feeding machines generally lack multi-stage correction and flattening structures, making it easy for PVC film to shift and wrinkle during transport. This results in quality defects in the finished seedling trays, such as misaligned holes, uneven thickness, and warping during molding, making defective product control difficult. Moreover, changing seedling tray models is difficult and time-consuming, making it impossible to adapt to flexible production of multiple types of seedling trays. In summary, existing seedling tray forming equipment suffers from technical shortcomings such as poor production continuity, weak product consistency, low degree of freedom in process adjustment, and high raw material and energy consumption. There is an urgent need to design a seedling tray forming device that is compact in structure, small in size, can continuously feed materials, and has a highly precise adjustable heating station to solve the above-mentioned industry pain points. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a novel rice seedling tray forming device, which is a compact, small-sized chain-type continuous conveyor plastic seedling tray forming device. This device enables uninterrupted continuous production of plastic rolls, improves the quality of finished seedling trays, reduces raw material loss, and flexibly adapts to the production of various specifications of seedling trays. It overcomes the defects of existing traditional seedling tray forming devices, such as low capacity due to intermittent operation, easy deviation of feeding, insufficient precision of heating position adjustment, cumbersome model changeover, high energy consumption, and large space occupation due to the dispersed overall structure.

[0004] To achieve the above objectives, this application adopts the following technical solution: This invention is a novel rice seedling tray forming device, comprising: a fixed frame, a film roll disposed below the fixed frame, a film flattening mechanism mounted above one end of the fixed frame, a conveying mechanism, and a film punching mechanism, a heating mechanism, a roll forming mechanism, and a cooling mechanism arranged sequentially along the conveying direction. The conveying mechanism extends horizontally from the discharge end of the film flattening mechanism and bends downwards within the fixed frame. The film punching mechanism is adjustablely disposed behind the output end of the film flattening mechanism. The heating mechanism, roll forming mechanism, and cooling mechanism are arranged sequentially along the film output direction after punching. The heating mechanism is an adjustable translational heating module that is detachably and fixedly connected to the fixed frame.

[0005] Further: The film flattening mechanism includes: a feeding roller, a tensioning roller, and a film straightening plate arranged on the back side of the tensioning roller, which are mounted on a fixed frame above the film roll; the film straightening plate is composed of two pressure plates arranged in parallel, and the feeding ends of the two pressure plates are provided with outward expansion guides, and the pressure plates are adjustablely connected to the side plates of the fixed frame.

[0006] Further: The conveying mechanism includes: a drive motor set on one side of the bottom of the fixed frame, a drive wheel shaft mounted on the bottom of the fixed frame and adapted to be connected to the drive motor for transmission, a plurality of driven wheels symmetrically arranged on the inner side of the fixed frame, and a conveying chain. The drive wheel shaft is provided with drive wheels on both sides. The conveying chain is provided with two drive wheels and driven wheels respectively symmetrically sleeved on the inner side of the two side walls of the fixed frame. The conveying chain drives the two sides of the film flattened by the film flattening mechanism to move continuously backward, and then passes through the film punching mechanism to pre-punch the bottom hole, through the film heating mechanism to heat and soften, through the roll forming mechanism to roll, and through the seedling tray cooling mechanism to cool and output.

[0007] Further: The conveying mechanism consists of a horizontal working section extending horizontally from the discharge end of the film flattening mechanism to the other end of the fixed frame and a downwardly bent output section. The multiple driven wheels consist of a first driven support wheel, a driven redirecting wheel, and a driven tensioning wheel arranged in parallel on the horizontal working section behind the film flattening plate. The driven tensioning wheel is located between the drive wheel shaft and the first driven support wheel. The driven redirecting wheel and the drive wheel on the drive wheel shaft are arranged vertically to form the output section. The film punching mechanism is adjustablely connected to the fixed frame of the horizontal working section through a punching roller adjustment seat. The film heating mechanism, roll forming mechanism, and cooling mechanism are arranged vertically along the output section. The horizontal working section and the downwardly inclined output section are provided with conveyor chain guide rails. A film guide plate is also provided on one side of the driven redirecting wheel.

[0008] Optionally: The conveying mechanism consists of a smoothly bent structure, consisting of a horizontal working section extending horizontally from the discharge end of the film flattening mechanism to the other end of the fixed frame, an inward folding transition section, and a downwardly bent output section, which is arranged in a ring within the fixed frame. The output section is inclined downwards. The film punching mechanism is adjustablely connected to the fixed frame of the horizontal working section via a punching roller adjustment seat. The heating mechanism, roll forming mechanism, and cooling mechanism are sequentially arranged on the fixed frame of the downwardly inclined output section. The multiple driven wheels consist of a first driven support wheel, a driven redirecting wheel, a driven transition wheel, a driven tensioning wheel, and a second driven support wheel arranged in parallel and correspondingly on the horizontal working section behind the film flattening plate, and are arranged in parallel on the inward folding transition section. The conveying chains of the horizontal working section and the downwardly inclined output section are provided with conveying chain guide rails. The conveying chain of the inward folding transition section between the driven redirecting wheel and the driven tensioning wheel is provided with a film guide plate.

[0009] Furthermore, the conveyor chain is also provided with multiple protruding teeth at intervals to drive the two sides of the film to move backward synchronously, and the fixed brackets on both sides above the input end of the conveyor chain are also symmetrically provided with film pressure rollers.

[0010] Further: The film punching mechanism includes: a punching pressure roller and a punching roller arranged parallel to each other. The punching pressure roller and the punching roller are tunably connected to a fixed bracket on both sides through a film punching roller adjusting seat. Multiple punching needles are evenly distributed on the roller surface of the punching roller. One end of the punching roller is also provided with a punching roller drive motor, which is fixed on one side of the fixed bracket. The other end of the punching roller is driven by a gear meshing with the punching pressure roller.

[0011] Further: The heating mechanism is located behind the output end of the film punching mechanism and includes: a heating adjustment structure fixed to one side of the fixed bracket and a movable heating module consisting of multiple heating lamps, two lamp covers arranged in parallel intervals, connecting seats fixed to the outer sides of the two lamp covers, a connecting rod fixed at one end to the connecting seat, a connecting plate at one end of the connecting rod, an adjusting rod hinged to the other end of the two connecting rods, an optical axis, a linear bearing, and a fixed seat; multiple fixed seats are symmetrically arranged and fixed to the fixed bracket, the optical axis is mounted between two symmetrically arranged fixed seats, the linear bearing is adapted to slide on the outer side of the optical axis, and the linear bearing is fixedly connected to the lamp cover through a side plate; the connecting plate is hinged to one end of the adjusting rod, the other end of the connecting plate is hinged to one end of the connecting rod, and multiple heating lamps are relatively staggered and embedded in the inner sides of the two parallel lamp covers.

[0012] Further: The roll forming mechanism is adjustablely mounted on a fixed bracket at the rear of the output end of the heating mechanism, including: a pressure roller drive motor mounted on one side of the fixed bracket, a forming convex roller and a forming concave roller mounted parallel to each other on the fixed bracket, and seedling tray forming roller adjustment seats respectively mounted at both ends of the forming convex roller and the forming concave roller. The bottom of the seedling tray forming roller adjustment seat is provided with an adjustment support seat that can be adjusted and fixed to the bottom of one side of the fixed bracket. The cooling mechanism is located at the rear of the output end of the roll forming mechanism to cool the formed plastic seedling trays online before outputting them. The cooling mechanism, roll forming mechanism, heating mechanism, film punching mechanism, and conveying mechanism are all electrically connected to the electrical control system box for linkage control.

[0013] Compared with the prior art, the present invention has the following advantages: 1. This application utilizes a film roll mounted on a fixed frame. A multi-stage flattening and closed-loop correction structure, consisting of a film feeding roller, a film tensioning roller, a film flattening plate, a conveyor chain, a film pressure roller, and a film guide plate, is sequentially arranged at the film roll output end. This effectively eliminates film wrinkles and lateral deviation. Combined with paired seedling tray forming rollers, the entire seedling tray experiences uniform pressure across all seedling holes, resulting in consistent tray thickness. This effectively improves common defects such as tray warping and rebound, hole misalignment, and surface cracking, significantly increasing the yield rate. The film roll is produced using a continuous production line operation with direct unwinding of a whole roll of PVC film. Unwinding, flattening, bottom hole punching, preheating, and roller forming are all uninterrupted, significantly improving production efficiency. The roll is only uniformly cut after forming, greatly reducing raw material waste and effectively controlling production costs. The chain is equipped with an independent tensioning mechanism that automatically compensates for chain deformation, resulting in stronger stability during conveying.

[0014] 2. By first extending horizontally along the discharge end of the film flattening mechanism from top to bottom and then bending downwards, the conveying mechanism is installed in the fixed frame. The film punching mechanism is adjustablely installed on the horizontal extension part behind the output end of the film flattening mechanism. The heating mechanism, roll forming mechanism, and cooling mechanism are arranged sequentially in the fixed bracket along the film output direction after punching. In this way, the conveying mechanism, which extends horizontally and then bends downwards, organically integrates the various processes along its conveying direction into the main body of the fixed frame. The overall structure is compact, makes full use of the internal space of the fixed bracket, effectively reduces the length of the production line, and thus effectively improves the space utilization rate. 3. By setting an adjustable punching roller adjustment seat, a seedling tray forming roller adjustment seat, and a linkage-type adjustable heating module, a multi-dimensional adjustment mechanism is formed. Without disassembling the whole machine mold frame, the diameter of the seedling tray ventilation holes, the depth of the hole cavity, and the film preheating temperature range can be changed by relying on mechanical adjustment components. Different specifications of rice seedling trays can be quickly switched, the flexible production capacity is stronger, and it can adapt to the processing needs of various seedling trays for early rice and late rice. 4. The heating mechanism adopts a rolling guide structure with an optical axis and linear bearings, which reduces frictional resistance and increases position adjustment accuracy. The preheating conditions can be precisely controlled according to the thickness of the PVC film and the conveying speed of the production line. In addition, the enclosed lamp cover gathers heat energy, and the heat is directed to the film, thus reducing production energy consumption.

[0015] 5. The heating mechanism adopts a modular integrated design, which can be slid out of the conveying area as a whole for maintenance and descaling operations. Maintenance operations do not require the entire production line to be shut down and the frame to be disassembled, effectively reducing downtime losses; the linkage structure can move the heating stroke as a whole, and the process parameters can be adjusted freely, conveniently and flexibly. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of one side of the present invention; Figure 2 This is a three-dimensional structural diagram of the other side of the present invention; Figure 3 This is a three-dimensional schematic diagram of the internal structure of the present invention; Figure 4 This is a schematic cross-sectional view of the internal structure of the present invention; Figure 5 This is a cross-sectional schematic diagram of another embodiment of the present invention; Figure 6 This is a three-dimensional structural diagram of the thin-film heating mechanism of the present invention; Figure 7 This is a schematic diagram of the thin film perforation mechanism of the present invention; Figure 8 This is a schematic diagram of the roll forming mechanism of the present invention.

[0017] Attached image labels: 1. Fixed frame; 2. Film roll; 3. Film flattening mechanism; 31. Feeding roller; 32. Tensioning roller; 33. Film leveling plate; 331. Pressing plate; 332. Outward expansion guide; 4. Conveying mechanism; 41. Drive motor; 42. Conveyor chain; 421. Outward protruding tooth; 43. Drive wheel shaft; 44. Driven wheel; 44. First driven support wheel; 441. Driven redirecting wheel; 442. Driven transition wheel; 443. Driven tensioning wheel; 444. Second driven support wheel; 445. Film guide plate; 45. Film pressure roller; 46. Conveyor chain guide rail; 47. Horizontal working section; 40. Downward bending output section; 48. 9; Inner fold transition section 48; Film punching mechanism 5; Punching roller drive motor 51; Film punching roller adjustment seat 52; Punching pressure roller 53; Punching roller 54; Punching needle 55; Heating mechanism 6; Heating adjustment structure 61; Lamp cover 62; Heating lamp 63; Connecting seat 64; Connecting rod 65; Connecting plate 66; Adjusting pull rod 67; Fixed seat 68; Optical shaft 69; Linear bearing 60; Roll forming mechanism 7; Pressure roller drive motor 71; Forming concave roller 72; Forming convex roller 73; Seedling tray forming roller adjustment seat 74; Adjusting support seat 75; Cooling mechanism 8. Detailed Implementation

[0018] To enhance understanding of the present invention, the invention will be further described in detail below with reference to the accompanying drawings. This embodiment is only used to explain the invention and does not constitute a limitation on the scope of protection of the invention.

[0019] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the combination or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1-5 The diagram shows a novel rice seedling tray forming device, comprising: a fixed frame 1, a film roll 2 mounted on a feeding rack below the fixed frame 1, a film flattening mechanism 3 mounted above the fixed frame 1, a conveying mechanism 4, and a film punching mechanism 5, a heating mechanism 6, a roll forming mechanism 7, and a cooling mechanism 8 arranged sequentially along the conveying direction. The conveying mechanism 4 extends horizontally from top to bottom along the discharge end of the film flattening mechanism 3, then bends downwards and is positioned within the fixed frame 1. The film punching mechanism 5 is adjustablely positioned on the horizontally extended portion of the conveying mechanism 4 behind the output end of the film flattening mechanism 3. The heating mechanism 6, the roll forming mechanism 7, and the cooling mechanism 8 are arranged sequentially along the film output direction after punching in a fixed bracket below the film punching mechanism 5. The conveying mechanism 4, which extends and bends downwards after flattening, organically integrates the various processes along its conveying direction into the main body of the fixed frame 1. The overall structure is compact, effectively reducing the length of the production line and thus improving space utilization. The film output after multi-stage flattening and correction by the film flattening mechanism 3 and the conveying mechanism 4 is continuously and uninterruptedly rolled, significantly improving production efficiency. The roll material is only uniformly cut after forming, greatly reducing raw material waste and effectively controlling production costs. The heating mechanism 6 is an adjustable translational heating module relative to the unfolded film, which is detachably and fixedly connected to the fixed frame. The heating mechanism 6 adopts a modular integrated design and can be slid out of the conveying area for maintenance, making maintenance work convenient.

[0022] Specifically: such as Figure 1 , 3As shown in Figure 5, the film flattening mechanism 3 includes: a feeding roller 31 and a tensioning roller 32 mounted on the two side walls of the fixed frame 1 above the film roll 2, and a film straightening plate 33 disposed on the rear side of the tensioning roller 32; the film straightening plate 33 is composed of two parallel pressing plates 331 arranged vertically, and the feeding ends of the two pressing plates 331 are provided with outward expansion guides 332 respectively. The pressing plates 331 are tunably connected to the two side plates of the fixed frame 1. After the unfolded film discharge end is opened by the feeding roller 31 and the tensioning roller 32, it passes between the two parallel pressing plates 331 to perform preliminary flattening of the film, and then is hung on the film conveying chain of the conveying mechanism 4 for automatic conveying.

[0023] Specifically: such as Figure 3-5 As shown, the conveying mechanism 4 includes: a drive motor 41 set on one side of the bottom of the fixed frame 1, a drive wheel shaft 43 mounted on the bottom of the fixed frame 1 and adapted to be connected to the drive motor 41 for transmission, a plurality of driven wheels 44 symmetrically arranged on the inner side of the fixed frame 1, and a conveying chain 42. The drive wheel shaft 43 is provided with drive wheels on both sides. The conveying chain 42 is provided with two drive wheels and driven wheels 44 respectively symmetrically sleeved on the inner side of the two side walls of the fixed frame 1. The conveying chain 42 drives the two sides of the film flattened by the film flattening mechanism 3 to move backward continuously, and passes through the film punching mechanism 5 to pre-punch the bottom hole, through the film heating mechanism 6 to heat and soften, through the roll forming mechanism 7 to roll and form, and through the seedling tray cooling mechanism 8 to cool and output. The conveying chain 42 is also provided with a plurality of external protruding teeth 421 at intervals to drive the two sides of the film to move backward synchronously. The fixed brackets on both sides above the input end of the conveying chain 42 are also symmetrically provided with film pressure rollers 46. The feeding roller 31, tensioning roller 32, and film leveling plate 33 in the film leveling mechanism 3, together with the conveyor chain 42, multiple protruding teeth 421 spaced on the conveyor chain 42, and the film pressure roller 46 located above the input end of the conveyor chain 42, form a multi-stage joint flattening and correction conveying system for the entire film process. This effectively eliminates wrinkles and lateral deviation during film processing. Combined with the paired seedling tray forming rollers, the pressure on each seedling hole of the entire seedling tray is uniform, resulting in a consistent thickness of the finished tray surface. This effectively improves common defects such as seedling tray warping and rebound, hole misalignment, and tray surface cracking, significantly increasing the yield rate.

[0024] Specifically: such as Figure 7As shown, the film punching mechanism 5 includes: a punching pressure roller 53 and a punching roller 54 arranged parallel to each other. The punching pressure roller 53 and the punching roller 54 are tunably connected to a fixed bracket on both sides via a film punching roller adjusting seat 52. The film punching roller adjusting seat 52 is provided with an adjustable elongated fixed hole, which can be adjusted vertically and horizontally fixed relative to the opening mounting bracket provided on the top of the fixed bracket. The gap between the punching pressure roller 53 and the punching roller 54 can also be adjusted. In one optional way, the bearing of one roller on the film punching roller adjusting seat 52 is fixedly connected to the film punching roller adjusting seat 52, and the bearing of the other roller is adjustablely fixed by sliding vertically with the film punching roller adjusting seat 52, thereby realizing the adjustable setting of the gap between the two rollers (not shown in the figure). Multiple punching needles 55 are evenly distributed on the roller surface of the punching roller 54. One end of the punching roller 54 is also provided with a punching roller drive motor 51, which is fixed on one side of the fixed bracket. The other end of the punching roller 54 is driven by a gear meshing with the punching pressure roller 53. The punching roller drive motor 51 drives the punching roller 54 to rotate. The transmission gear installed at one end of the punching roller 54 drives the punching pressure roller 53 to rotate. The film entering the seedling tray between the two rollers will be punched and carried away by the conveyor chain. The punching pressure roller 53 is set as a rubber coating roller.

[0025] Specifically: such as Figure 8 As shown, the roll forming mechanism 7 is adjustablely mounted on a fixed bracket on the rear side of the output end of the heating mechanism 6. It includes: a pressure roller drive motor 71 mounted on one side of the fixed bracket 1, a forming convex roller 73 and a forming concave roller 72 mounted vertically and horizontally on the fixed bracket 1, and seedling tray forming roller adjustment seats 74 respectively mounted at both ends of the forming convex roller 73 and the forming concave roller 72. The bottom of the seedling tray forming roller adjustment seat 74 is provided with an adjustment support seat 75, which can be adjusted and fixed to the bottom of one side of the fixed bracket to adjust the gap between the forming convex roller 73 and the forming concave roller 72 and the overall vertical installation position. The pressure roller drive motor 71 drives the seedling tray forming convex roller 73, and the transmission gear mounted on the seedling tray forming convex roller 73 drives the seedling tray forming concave roller 72 to rotate. The heating film entering between the two rollers will be roll-formed and then carried away by the conveyor chain. The seedling tray forming convex roller 73 and seedling tray forming concave roller 72 are made of high-strength nylon to reduce weight. The fit gap between the two rollers can be finely adjusted according to the thickness of the film. The cooling mechanism 8 is set on the rear side of the output end of the roll forming mechanism 7 to cool the formed plastic seedling trays online before output. The cooling mechanism 8, roll forming mechanism 7, heating mechanism 6, film punching mechanism 5 and conveying mechanism 4 are electrically connected to the electrical control system box for linkage control.

[0026] Specifically: such as Figure 1-6As shown, the heating mechanism 6 is located behind the output end of the film punching mechanism 5, and includes: a heating adjustment structure 61 fixed on one side of the fixed bracket, and a movable heating module consisting of multiple heating lamps 63, two lamp covers 62 arranged in parallel intervals, connecting seats 64 correspondingly fixed on the outside of the two lamp covers 62, a connecting rod 65 fixed on the connecting seat 64 at one end, a connecting plate 66 connecting one end of the hinged connecting rod 65, an adjusting pull rod 67 hinged to the other end of the two connecting rods 65, an optical axis 69, a linear bearing 60, and a fixed seat 68; the fixed seats 68 are symmetrically arranged with multiple fixed to the fixed bracket 1, the optical axis 69 is mounted between the two symmetrically arranged fixed seats 68, the linear bearing 60 is adapted to slide on the outside of the optical axis 69, and the linear bearing 60 is fixedly connected to the lamp cover 62 through the side plate; The connecting plate 66 is hinged to one end of the adjusting rod 67, and the other end of the connecting plate 66 is hinged to one end of the connecting rod 65. Multiple heating lamps 63 are staggered and embedded on the inner side of two parallel lamp covers 62. The perforated film is heated and softened at equal intervals between the two lamp covers 62 and then conveyed. The connecting seat 64 is longitudinally fixed at the middle position of one end of the outer side of the two lamp covers 62. One end of the adjusting rod 67 is connected to the heating adjustment structure 61. The heating adjustment structure 61 is driven by a servo-controlled motor. There are two sets of fixed seats 68, which are respectively set on the upper and lower sides of the connecting seat 64 to support the stable sliding and translation of the two lamp covers 62 inside and outside. Under the drive of the adjusting rod 67, the two lamp covers 62 slide relative to the optical axis 69 to adjust the heating distance between the heating lamps 63 and the perforated film. The movable heating module adopts a rolling guide structure with an optical axis 69 and a linear bearing 60, which has low frictional resistance and higher position adjustment accuracy. It can precisely control the preheating conditions according to the PVC film thickness and the production line conveying speed. The enclosed lamp cover gathers heat energy, and the heat is directed to the film, reducing production energy consumption. At the same time, the heating mechanism 6 adopts a modular integrated design, which can be slid out of the conveying area for installation and maintenance without stopping the entire production line to disassemble the frame, effectively reducing downtime losses. The linkage structure can move the heating stroke as a whole, and the process parameters can be adjusted with high freedom and convenient control.

[0027] This application establishes a multi-dimensional adjustment mechanism consisting of an adjustable film perforation roller adjustment seat 52, a seedling tray forming roller adjustment seat 74, and a linkage-type adjustable heating module. Without disassembling the entire machine mold frame, the diameter of the seedling tray ventilation holes, the depth of the cavity, and the film preheating temperature range can be changed by relying on mechanical adjustment components. This allows for quick switching between different specifications of rice seedling trays, resulting in stronger flexible production capabilities and adaptability to the processing needs of various seedling trays for early and late rice.

[0028] Its action process: The entire roll of PVC plastic film is assembled at the unwinding station at the feed end of the equipment. The film end is pulled around the film unwinding roller 31 and tension roller 32 in sequence, and then passes through the film flat plate 33, conveyor chain 42 and film pressure roller 46 to complete the flattening and limiting, and enters the chain conveyor mechanism 4. The two sides of the film are clamped and fixed on the film conveyor chain, and are conveyed to the film punching roller for punching in sequence. After passing through the film guide plate, it enters the film heating area and is heated and softened by the film heating mechanism 6. Then it enters the roll forming mechanism 7 for roll forming, and is cooled and output by the seedling tray cooling mechanism 8. According to the specifications of the seedling tray to be produced, the operator adjusts the gap of the punching roller in advance through the film punching roller adjustment seat 52 to determine the size of the air holes in the seedling tray, and then uses the seedling tray forming roller adjustment seat 74 to set the gap between the forming convex roller 73 and the forming concave roller 72 to lock the forming depth of the seedling hole cavity. When inspecting the heating lamps, the entire modular heating module can be moved away from the conveying path by pulling the adjusting rod, and maintenance work can be carried out directly without disassembling the main frame; when replacing with another model and specification of seedling tray, production can be quickly started by adjusting the process parameters through each set of adjusting seats and the linkage heating mechanism, without disassembling the entire molding mold, making the changeover process simple and efficient.

[0029] An alternative implementation, such as Figure 5 As shown: The conveying mechanism 4 consists of a horizontal working section 40 extending horizontally from the discharge end of the film flattening mechanism 3 to the other end of the fixed frame 1, and a downwardly bent output section 49. Multiple driven wheels 44 consist of a first driven support wheel 441, a driven redirecting wheel 442, and a driven tensioning wheel 444, all parallel to and correspondingly arranged on the horizontal working section 40 behind the film flattening plate 33. The driven tensioning wheel 444 is mounted on the side plate of the fixed bracket between the drive wheel shaft 43 and the first driven support wheel 441 to adjust the tension of the conveyor chain 42. The redirecting wheel 442 and the drive wheel on the drive wheel shaft 43 are arranged vertically to form the output section 49. The film punching mechanism 5 is adjustablely connected to the fixed frame of the horizontal working section 40 via the punching roller adjusting seat 52. The film heating mechanism 6, the roll forming mechanism 7, and the cooling mechanism 8 are arranged vertically along the output section 49. The horizontal working section 40 and the output section 49 are equipped with a conveyor chain guide rail 47 to limit and support the conveyor chain. A film guide plate 45 is also provided on one side of the driven redirecting wheel 442 to guide and limit the film on the conveyor chain. This horizontally bent downward structure of the conveyor line makes the overall device structure compact, reduces the production length, and effectively improves the space utilization rate.

[0030] An alternative implementation, such as Figure 1-4As shown, the conveying mechanism 4 consists of a smoothly bent structure ring within the fixed frame 1, comprising a horizontal working section 40 extending horizontally from the discharge end of the film flattening mechanism 3 to the other end of the fixed frame 1, an inward folding transition section 48, and a downwardly bent output section 49. The output section 49 is inclined downwards. The film punching mechanism 5 is adjustablely connected to the fixed frame of the horizontal working section 40 via a punching roller adjusting seat 52. The heating mechanism 6, the roll forming mechanism 7, and the cooling mechanism 8 are sequentially arranged on the fixed frame of the downwardly inclined output section 49. Multiple driven wheels 44 The system comprises a first driven support wheel 441, a driven redirecting wheel 442, a driven transition wheel 443 and a driven tensioning wheel 444, all parallel to each other and arranged on the horizontal working section 40 behind the film straightening plate 33; a second driven support wheel 445, all arranged on the inner fold transition section 48; and a third driven support wheel 445, all arranged on the downward tilting output section 49. A conveyor chain guide rail 47 is provided on the conveyor chain 42 between the horizontal working section 40 and the downward tilting output section 49. A film guide plate 45 is provided on the conveyor chain 42 in the inner fold transition section 48 between the driven redirecting wheel 442 and the driven tensioning wheel 444. Compared to the previous embodiment, this design extends the conveyor chain length and improves service life.

[0031] The embodiments disclosed herein are preferred embodiments, but are not limited thereto. Those skilled in the art can readily grasp the spirit of the present invention based on the above embodiments and make different extensions and variations, but as long as they do not depart from the spirit of the present invention, they are all within the protection scope of the present invention.

Claims

1. A novel rice seedling tray forming device, comprising: A fixed frame (1), a film roll (2) set below the fixed frame (1), a film flattening mechanism (3) set above one end of the fixed frame (1), a conveying mechanism (4), and a film punching mechanism (5), a heating mechanism (6), a roll forming mechanism (7), and a cooling mechanism (8) arranged sequentially along the conveying direction, characterized in that: the conveying mechanism (4) extends horizontally from the discharge end of the film flattening mechanism (3) and bends downwards into the fixed frame (1); the film punching mechanism (5) is adjustablely set behind the output end of the film flattening mechanism (3); the heating mechanism (6), the roll forming mechanism (7), and the cooling mechanism (8) are arranged sequentially along the film output direction after punching; the heating mechanism (6) is set as an adjustable translational heating module that is detachably fixedly connected to the fixed frame.

2. The rice seedling tray forming device according to claim 1, characterized in that: The film flattening mechanism (3) includes: a feeding roller (31), a tensioning roller (32) mounted on a fixed frame (1) above the film roll (2), and a film flat plate (33) mounted on the rear side of the tensioning roller (32); the film flat plate (33) is composed of two pressure plates (331) arranged in parallel above and below, and the feeding ends of the two pressure plates (331) are provided with outward expansion guides (332), and the pressure plates (331) are tunably connected to the two side plates of the fixed frame (1).

3. The rice seedling tray forming device according to claim 1, characterized in that: The conveying mechanism (4) includes: a drive motor (41) set on one side of the bottom of the fixed frame (1), a drive wheel shaft (43) mounted on the bottom of the fixed frame (1) and adapted to be connected to the drive motor (41) for transmission, a plurality of driven wheels (44) symmetrically arranged on the inner side of the fixed frame (1) and a conveying chain (42). The drive wheel shaft (43) is provided with drive wheels on both sides. The conveying chain (42) is provided with two drive wheels and driven wheels (44) respectively symmetrically sleeved on the inner side of the two side walls of the fixed frame (1). The conveying chain (42) drives the two sides of the film flattened by the film flattening mechanism (3) to move continuously backward, and is pre-punched by the film punching mechanism (5), heated and softened by the film heating mechanism (6), rolled and formed by the roll forming mechanism (7), and cooled and output by the seedling tray cooling mechanism (8).

4. The rice seedling tray forming device according to claim 3, characterized in that: The conveying mechanism (4) consists of a horizontal working part (40) extending horizontally from the discharge end of the film tensioning mechanism (3) to the other end of the fixed frame (1) and a downwardly bent output part (49). The plurality of driven wheels (44) consist of a first driven support wheel (441), a driven redirecting wheel (442), and a driven tensioning wheel (444) arranged parallel to each other on the horizontal working part (40) behind the film leveling plate (33). The driven tensioning wheel (444) is located between the drive wheel shaft (43) and the first driven support wheel (441). The drive wheel (442) and the drive wheel on the drive wheel shaft (43) are arranged vertically to form the output section (49). The film punching mechanism (5) is tunably connected to the fixed frame of the horizontal working section (40) through the punching roller adjustment seat (52). The film heating mechanism (6), the roll forming mechanism (7) and the cooling mechanism (8) are arranged vertically along the output section (49). The horizontal working section (40) and the downward inclined output section (49) are provided with a conveyor chain guide rail (47). The driven redirecting wheel (442) is also provided with a film guide plate (45) on one side.

5. The rice seedling tray forming device according to claim 3, characterized in that: The conveying mechanism (4) consists of a smooth bending structure ring within the fixed frame (1), comprising a horizontal working part (40) extending horizontally from the discharge end of the film flattening mechanism (3) to the other end of the fixed frame (1), an inward folding transition part (48), and a downwardly bent output part (49). The output part (49) is inclined downwards. The film punching mechanism (5) is adjustablely connected to the fixed frame of the horizontal working part (40) via a punching roller adjusting seat (52). The heating mechanism (6), the roll forming mechanism (7), and the cooling mechanism (8) are sequentially arranged on the fixed frame of the downwardly inclined output part (49). The multiple driven wheels (44) are formed by... The system consists of a first driven support wheel (441), a driven redirecting wheel (442), a driven transition wheel (443), a driven tensioning wheel (444) on the inner folding transition section (48), and a second driven support wheel (445) on the downward tilting output section (49), which are arranged in parallel on the horizontal working section (40) behind the film flat plate (33). The conveyor chain (42) of the horizontal working section (40) and the downward tilting output section (49) is provided with a conveyor chain guide rail (47). The conveyor chain (42) of the inner folding transition section (48) between the driven redirecting wheel (442) and the driven tensioning wheel (444) is provided with a film guide plate (45).

6. The rice seedling tray forming device according to claim 3, characterized in that: The conveyor chain (42) is also provided with a plurality of protruding teeth (421) at intervals to drive the two sides of the film to move backward synchronously. The fixed brackets on both sides above the input end of the conveyor chain (42) are also symmetrically provided with film pressure rollers (46).

7. The rice seedling tray forming device according to claim 1, characterized in that: The film punching mechanism (5) includes a punching pressure roller (53) and a punching roller (54) arranged parallel to each other. The punching pressure roller (53) and the punching roller (54) are tunably connected to the fixed bracket on both sides through the film punching roller adjustment seat (52). Multiple punching needles (55) are evenly distributed on the roller surface of the punching roller (54). One end of the punching roller (54) is also provided with a punching roller drive motor (51). The punching roller drive motor (51) is fixed on one side of the fixed bracket. The other end of the punching roller (54) is driven by the punching pressure roller (53) through gear meshing.

8. The rice seedling tray forming device according to claim 1, characterized in that: The heating mechanism (6) is located on the rear side of the output end of the film punching mechanism (5), and includes: a heating adjustment structure (61) fixed on one side of the fixed bracket and a combination of multiple heating lamps (63), two lamp covers (62) arranged in parallel intervals, connecting seats (64) fixed on the outer sides of the two lamp covers (62), a connecting rod (65) fixed on the connecting seat (64) at one end, a connecting plate (66) at one end of the hinged connecting rod (65), an adjusting pull rod (67) hinged to the other end of the two connecting rods (65), an optical axis (69), a linear bearing (60), and a fixed seat (68) forming a flat... The heating module is symmetrically provided with multiple fixed bases (68) fixed to the fixed bracket (1). The optical axis (69) is mounted between two symmetrically arranged fixed bases (68). The linear bearing (60) is adapted to slide on the outside of the optical axis (69). The linear bearing (60) is fixedly connected to the lamp cover (62) through the side plate. The connecting plate (66) is hinged to one end of the adjusting rod (67). The other end of the connecting plate (66) is hinged to one end of the connecting rod (65). Multiple heating lamps (63) are relatively staggered and embedded in the inner side of two parallel lamp covers (62).

9. The rice seedling tray forming device according to claim 1, characterized in that: The roll forming mechanism (7) is adjustablely mounted on a fixed bracket on the rear side of the output end of the heating mechanism (6), including: a pressure roller drive motor (71) mounted on one side of the fixed bracket (1), a forming convex roller (73) and a forming concave roller (72) mounted parallel to each other on the fixed bracket (1), and seedling tray forming roller adjustment seats (74) respectively mounted on both ends of the forming convex roller (73) and the forming concave roller (72). The bottom of the seedling tray forming roller adjustment seat (74) is provided with an adjustment support seat (75) which is adjustable and fixed on the bottom side of the fixed bracket. The cooling mechanism (8) is mounted on the rear side of the output end of the roll forming mechanism (7) to cool the formed plastic seedling trays online before outputting them. The cooling mechanism (8), the roll forming mechanism (7), the heating mechanism (6), the film punching mechanism (5), and the conveying mechanism (4) are electrically connected to the electrical control system box for linkage control.

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