Paddy rice seedling raising precision seeder

Abstract

According to the rice seedling raising precision seeder, seeds are directly placed in a seedling tray, the seeds evenly placed on the seedling tray can be cultivated, and the problem that rice seeding uniformity is not enough is solved. During planting, the seedling tray is directly placed in the field, so that inaccurate seedling taking position of a seedling taking needle of a rice transplanter is avoided, the seedling leakage phenomenon of the rice transplanter is avoided, the phenomenon that the seedling leakage phenomenon of rice transplanting is compensated by increasing the seed use amount in the seeding and seedling raising link is avoided, and the yield of rice is ensured.

Description

Technical Field

[0001] The present invention relates to the field of seeding machinery, and in particular to a precision seeding machine for rice seedling raising. Background Art

[0002] The current situation of rice seedling raising and sowing; the uniformity of rice sowing is insufficient, and missing seedlings are likely to occur. In the sowing and seedling raising process, the amount of seeds used is increased to make up for the missing seedlings during transplanting.

[0003] The disadvantages of a large amount of seeds used for seedling raising and sowing: it increases the seed cost. Increasing the amount of seeds used results in weak growth of seedlings competing for light. A large density of seedlings leads to poor ventilation and is prone to diseases. Weak seedlings have poor frost resistance after transplanting, slow greening, and are prone to seedling death. Weak seedling quality leads to late tillering, and late tillers cannot produce large panicles. The thousand-grain weight not meeting the standard affects the rice yield.

[0004] Therefore, a precision seeding machine for rice seedling raising is needed to solve the above problems. Summary of the Invention

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A precision seeding machine for rice seedling raising includes a driving vehicle body, and a conveyor is rotatably arranged on the driving vehicle body; a seedling tray structure, a first soil covering structure, a sowing structure, a second soil covering structure and a picking and placing mechanism are sequentially arranged in the conveying direction of the conveyor;

[0007] The seedling tray structure is used to place the seedling tray on the conveyor. The first soil covering structure is used to place the planting medium on the placed seedling tray. The sowing structure is used to place the seeds in the seedling tray. The second soil covering structure is used to place the planting medium on the seeds in the seedling tray. The picking and placing mechanism is used to place the seedling tray at the corresponding position.

[0008] Preferably, the seedling tray structure includes a placing frame body, two first telescopic mechanisms, two second telescopic mechanisms and a plurality of seedling trays. The placing frame body is connected to the driving vehicle body and is used to place a plurality of vertically stacked seedling trays; the seedling trays are arranged above the conveyor; the two first telescopic mechanisms are symmetrically arranged on both sides of the conveyor, and the two second telescopic mechanisms are symmetrically arranged on both sides of the conveyor; the output end of the first telescopic mechanism is located below the output end of the second telescopic mechanism; the two first telescopic mechanisms are used to block or release the lowermost seedling tray; the two second telescopic mechanisms are used to block or release the second-lowermost seedling tray.

[0009] Preferably, both the first soil covering structure and the second soil covering structure include a housing, a feeding shaft is rotatably arranged inside the housing, a plurality of fixing rods are arranged on the outer periphery of the feeding shaft, a soil covering motor is arranged on the housing, and the output end of the soil covering motor is in transmission connection with the feeding shaft; a filter screen is arranged at the bottom of the housing.

[0010] Preferably, the shell is also provided with a vibration motor, which is used to drive the shell to vibrate so that the planting medium falls from the mesh of the filter screen onto the seedling tray.

[0011] Preferably, the first soil covering structure and the second soil covering structure are vibrating feeders.

[0012] Preferably, the sowing structure includes a sowing frame, a vacuum pump, a negative pressure box, a seed placement box, and a movable telescopic structure; the negative pressure box is provided with a seed adsorption mechanism; the seed placement box is arranged on one side of the conveyor for placing seeds; the sowing frame is connected to the driving vehicle body, the vacuum pump is fixed on the sowing frame, the vacuum pump is connected to the negative pressure box, and the vacuum pump is used to form a negative pressure in the negative pressure box; the seed adsorption mechanism is connected to the inside of the negative pressure box for adsorbing or releasing seeds, the movable telescopic structure is connected to the driving vehicle body, the output end of the movable telescopic structure is connected to the negative pressure box, the movable telescopic structure is used to drive the negative pressure box to move relative to the seed placement box and the conveyor, and the negative pressure box is arranged above the conveyor.

[0013] Preferably, the negative pressure box is symmetrically and rotatably provided with two guide wheels on both sides, and the sowing frame is symmetrically provided with two guide rails; each guide wheel is rotatably connected to a guide rail, and the negative pressure box and the seed placement box are arranged between the two guide rails.

[0014] Preferably, a plurality of seed placement slots are provided in a rectangular array at the upper end of the seed placement box.

[0015] Preferably, the negative pressure box and the seed placement box are both rectangular structures.

[0016] Preferably, a guide groove is provided on the guide rail, and the guide groove is used to drive the negative pressure box to descend relative to the seed placement box when the negative pressure box moves to above the seedling tray, so that the seed adsorption mechanism at the lower end of the negative pressure box relative to the seedling tray is close to the seedling tray on the conveyor, so that the seeds can fall on the seedling tray; the horizontal height of the upper end of the seed placement box is higher than the upper end of the seed tray that moves with the conveyor.

[0017] Preferably, a rolling roller is arranged between the first soil covering structure and the negative pressure box, and a plurality of protrusions are arranged on the outer circumference of the rolling roller. The rolling roller is rotatably arranged above the conveyor. When the seedling tray with the sowing medium placed by the first soil covering structure passes under the rolling roller, the rolling roller rotates with the sowing medium of the seedling tray, and at the same time, the plurality of protrusions squeeze the sowing medium to form a plurality of pits.

[0018] Furthermore, the rolling roller is rotatably connected to the driving vehicle body.

[0019] Preferably, the rolling roller is transmission-connected to a rolling motor, the rolling motor is used to drive the rolling roller to rotate, and the rolling motor is connected to a driving vehicle body.

[0020] Preferably, a plurality of adsorption grooves are provided at the lower end of the negative pressure box, and the plurality of adsorption grooves are provided corresponding to the plurality of seed placement grooves. Each adsorption groove is provided with a plurality of suction nozzles, and the suction nozzles are connected to the interior of the negative pressure box.

[0021] Preferably, the number of the plurality of suction nozzles is set corresponding to the number of the plurality of pits squeezed out by the rolling roller on the seedling tray. In one embodiment of the present invention, the lower end of the suction nozzle is flush with the lower end of the adsorption groove, so that the suction nozzle can adsorb seeds from the seed placement groove.

[0022] Preferably, the suction nozzle has a trumpet-shaped structure.

[0023] Preferably, the picking and placing mechanism includes a horizontal moving frame, a vertical telescopic structure, a clamping frame, two clamping telescopic structures, two clamping claws and a horizontal telescopic structure; the lower end of the horizontal moving frame is slidably arranged on the driving vehicle body, the two ends of the vertical telescopic structure are respectively connected to the clamping frame and the horizontal moving frame, the vertical telescopic structure is arranged above the conveyor, the two clamping telescopic structures are symmetrically arranged on the clamping frame, and the output end of each clamping telescopic structure is connected to a clamping claw; the two clamping claws are symmetrically arranged; the vertical telescopic structure is used to drive the clamping claw to move vertically relative to the conveyor; one end of the horizontal telescopic structure is connected to the driving vehicle body, and the other end is connected to the horizontal moving frame; the horizontal telescopic structure is used to drive the clamping claw to move horizontally, and the two clamping claws are used to clamp the seedling tray.

[0024] Preferably, a clearance groove for making way for the clamping frame is provided on the driving vehicle body, and the pick-up and placement mechanism can place the clamped seedling tray on the ground through the clearance groove 1.

[0025] Furthermore, the clamp is an electric clamp or a pneumatic clamp.

[0026] Preferably, the first telescopic mechanism, the second telescopic mechanism, the movable telescopic structure, the clamping telescopic structure, and the horizontal telescopic structure are electric telescopic rods or pneumatic telescopic rods.

[0027] Preferably, a square movable frame is fixedly provided on the top of the negative pressure box, the output end of the movable telescopic structure moves through the square movable frame, and two limit parts are symmetrically provided on the output end of the movable telescopic structure.

[0028] Preferably, the conveyor is a double-belt conveyor.

[0029] Preferably, the driving vehicle body is a crawler tractor.

[0030] Preferably, the planting medium is granular and comprises peat granules.

[0031] Preferably, a plurality of seedling tray holes are provided on the seedling tray.

[0032] Preferably, a support column is provided at each of the four corners of the bottom surface of the seedling tray, so that the seedling tray can be directly inserted into the field.

[0033] Due to the adoption of the above technical solution, the present invention has the following technical advances compared with the prior art:

[0034] The present invention directly puts seeds into the seedling tray, and the seeds evenly placed on the seedling tray can be cultivated, thereby solving the problem of insufficient uniformity in rice sowing. When planting, the seedling tray is directly placed in the field, which avoids the inaccurate position of the seedling needle of the transplanter, avoids the phenomenon of seedling leakage of the transplanter, and avoids increasing the amount of seeds used in the sowing and seedling raising process to compensate for the phenomenon of seedling leakage, thereby ensuring the yield of rice. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0036] Figure 1 It is a structural schematic diagram of the rice seedling raising precision seeder of the present invention;

[0037] Figure 2 It is a structural schematic diagram of the rice seedling raising precision seeder of the present invention;

[0038] Figure 3 It is a schematic diagram of the structure of the negative pressure box of the present invention;

[0039] Figure 4 It is a structural schematic diagram of the seedling tray of the present invention;

[0040] Figure 5 It is a structural schematic diagram of the first soil covering structure and the second soil covering structure of the present invention;

[0041] Figure 6 It is a partial structural schematic diagram of the seeding structure of the present invention.

[0042] Description of main component symbols:

[0043]

[0044] DETAILED DESCRIPTION

[0045] The following embodiments may help those skilled in the art to more fully understand the present invention, but shall not limit the present invention in any way.

[0046] Please refer to Figures 1-6A rice seedling raising precision seeder comprises a driving vehicle body 1, on which a conveyor 2 is rotatably arranged; a seedling tray structure 3, a first soil covering structure 4, a sowing structure 5, a second soil covering structure 6 and a taking and placing mechanism 7 are sequentially arranged in the conveying direction of the conveyor 2;

[0047] The seedling tray structure 3 is used to place the seedling tray on the conveyor 2, the first covering structure 4 is used to place the planting medium on the seedling tray; the sowing structure 5 is used to place the seeds in the seedling tray; the second covering structure 6 is used to place the planting medium for the seeds in the seedling tray, and the picking and placing mechanism 7 is used to place the seedling tray at the corresponding position.

[0048] In one embodiment of the present invention, the seedling tray structure 3 includes a placement frame 31, two first telescopic mechanisms 32, two second telescopic mechanisms 33 and a plurality of seedling trays 34. The placement frame 31 is connected to the driving vehicle body 1, and the placement frame 31 is used to place a plurality of vertically stacked seedling trays 34; the seedling trays 34 are arranged above the conveyor 2; the two first telescopic mechanisms 32 are symmetrically arranged on both sides of the conveyor 2, and the two second telescopic mechanisms 33 are symmetrically arranged on both sides of the conveyor 2; the output end of the first telescopic mechanism 32 is located below the output end of the second telescopic mechanism 33; the two first telescopic mechanisms 32 are used to block or release the seedling tray located at the bottom layer; the two second telescopic mechanisms 33 are used to block or release the seedling tray located at the second to last layer. Through the cooperation of the two first telescopic mechanisms 32 and the two second telescopic mechanisms 33, a plurality of vertically stacked seedling trays can be placed on the conveyor 2 in sequence.

[0049] In one embodiment of the present invention, the first soil covering structure 4 and the second soil covering structure 6 both include a housing 41, a feed shaft 42 is rotatably arranged inside the housing 41, a plurality of fixing rods 43 are arranged on the outer periphery of the feed shaft, a soil covering motor 44 is arranged on the housing 41, and the output end of the soil covering motor 44 is transmission-connected with the feed shaft 42; a filter screen 45 is arranged at the bottom of the housing 41. When in use, the planting medium is placed inside the housing 41, and the feed shaft 42 is driven to rotate by the soil covering motor 44, thereby driving a plurality of fixing rods 43 to continuously stir the planting medium inside the housing 41, so that the planting medium falls from the mesh of the filter screen 45 into the seedling tray.

[0050] Furthermore, the housing 41 is also provided with a vibration motor, which is used to drive the housing 41 to vibrate so that the planting medium falls from the mesh of the filter 45 onto the seedling tray.

[0051] In one embodiment of the present invention, the first soil covering structure 4 and the second soil covering structure 6 are vibrating feeders.

[0052] In one embodiment of the present invention, the sowing structure 5 includes a sowing frame 51, a vacuum pump 52, a negative pressure box 53, a seed placement box 55, and a movable telescopic structure 56; the negative pressure box 53 is provided with a seed adsorption mechanism 54; the seed placement box 55 is arranged on one side of the conveyor 2 for placing seeds; the sowing frame 51 is connected to the driving vehicle body 1, the vacuum pump 52 is fixed on the sowing frame 51, the vacuum pump 52 is connected to the negative pressure box 53, and the vacuum pump 52 is used to form a negative pressure in the negative pressure box 53; the seed adsorption mechanism 54 is connected to the inside of the negative pressure box 53 for adsorbing or releasing seeds, the movable telescopic structure 56 is connected to the driving vehicle body 1, and the output end of the movable telescopic structure 56 is connected to the negative pressure box 53. The movable telescopic structure 56 is used to drive the negative pressure box 53 to move relative to the seed placement box 55 and the conveyor 2, and the negative pressure box 53 is arranged above the conveyor 2.

[0053] When the vacuum pump 52 is turned off and the suction force disappears, the seeds adsorbed on the seed adsorption mechanism 54 can fall down and fall into the corresponding seedling tray.

[0054] In one embodiment of the present invention, the negative pressure box 53 is symmetrically and rotatably provided with two guide wheels 531 on both sides, and the sowing frame 51 is symmetrically provided with two guide rails 532; each guide wheel 531 is rotatably connected to a guide rail 532, and the negative pressure box 53 and the seed placement box 55 are arranged between the two guide rails 532.

[0055] In one embodiment of the present invention, a plurality of seed placement slots 551 are provided in a rectangular array on the upper end of the seed placement box 55 .

[0056] In one embodiment of the present invention, the negative pressure box 53 and the seed placement box 55 are both rectangular parallelepiped structures.

[0057] In one embodiment of the present invention, a guide groove 5321 is provided on the guide rail 532. The guide groove 5321 is used to drive the negative pressure box 53 to descend relative to the seed placement box 55 when the negative pressure box 53 moves to above the seedling tray 34, so that the seed adsorption mechanism 54 at the lower end of the negative pressure box 53 is close to the seedling tray 34 on the conveyor 2, so that the seeds can fall on the seedling tray 34; the horizontal height of the upper end of the seed placement box 55 is higher than the upper end of the seed tray 34 that moves with the conveyor 2.

[0058] In one embodiment of the present invention, a rolling roller 8 is arranged between the first soil covering structure 4 and the negative pressure box 53, and a plurality of protrusions 81 are arranged on the outer periphery of the rolling roller 8. The rolling roller 8 is rotatably arranged above the conveyor 2. When the seedling tray 34 with the sowing medium placed by the first soil covering structure 4 passes under the rolling roller 8, the rolling roller 8 rotates following the sowing medium of the seedling tray 34, and at the same time, the plurality of protrusions 81 squeeze the sowing medium to form a plurality of pits.

[0059] Furthermore, the rolling roller 8 is rotatably connected to the driving vehicle body 1 .

[0060] In one embodiment of the present invention, the rolling roller 8 is transmission-connected to the rolling motor, the rolling motor is used to drive the rolling roller 8 to rotate, and the rolling motor is connected to the driving vehicle body 1 .

[0061] In one embodiment of the present invention, a plurality of adsorption grooves 533 are provided at the lower end of the negative pressure box 53, and the plurality of adsorption grooves 533 are provided corresponding to a plurality of seed placement grooves 551. Each adsorption groove 533 is provided with a plurality of suction nozzles 534, and the suction nozzles 534 are connected to the interior of the negative pressure box 53.

[0062] In one embodiment of the present invention, the number of the plurality of suction nozzles is set corresponding to the number of the plurality of pits squeezed out by the rolling roller 8 on the seedling tray 34. In one embodiment of the present invention, the lower end of the suction nozzle is flush with the lower end of the adsorption groove 533, so that the suction nozzle can adsorb seeds from the seed placement groove 551.

[0063] In one embodiment of the present invention, the pick-up and placement mechanism 7 includes a horizontal moving frame 71, a vertical telescopic structure 72, a clamping frame 73, two clamping telescopic structures 74, two clamping claws 75 and a horizontal telescopic structure 76; the lower end of the horizontal moving frame 71 is slidably arranged on the driving vehicle body 1, and the two ends of the vertical telescopic structure 72 are respectively connected to the clamping frame 73 and the horizontal moving frame 71, the vertical telescopic structure 7 is arranged above the conveyor 2, and the two clamping telescopic structures 74 are symmetrically arranged on the clamping frame 73, and the output end of each clamping telescopic structure 74 is connected to a clamping claw 75; the two clamping claws 75 are symmetrically arranged; the vertical telescopic structure 72 is used to drive the clamping claw 75 to move vertically relative to the conveyor 2; one end of the horizontal telescopic structure 76 is connected to the driving vehicle body 1, and the other end is connected to the horizontal moving frame 71; the horizontal telescopic structure 76 is used to drive the clamping claw 75 to move horizontally, and the two clamping claws 75 are used to clamp the seedling tray 34.

[0064] In one embodiment of the present invention, a clearance groove 10 for making way for the clamping frame 73 is provided on the driving vehicle body 1, and the pick-up and place mechanism 7 can place the clamped seedling tray 34 on the ground through the clearance groove 10.

[0065] Furthermore, the clamp 75 is an electric clamp or a pneumatic clamp.

[0066] In one embodiment of the present invention, the first telescopic mechanism 32 , the second telescopic mechanism 33 , the movable telescopic structure 56 , the clamping telescopic structure 74 , and the horizontal telescopic structure 76 are electric telescopic rods or pneumatic telescopic rods.

[0067] In one embodiment of the present invention, a square moving frame 535 is fixedly provided on the top of the negative pressure box 53, and the output end of the moving telescopic structure 56 moves through the square moving frame 535, and two limit portions 536 are symmetrically provided on the output end of the moving telescopic structure 56. When the negative pressure box 53 moves downward along the guide groove 5321 or the negative pressure box 53 moves upward relative to the groove 5321, the output end of the moving telescopic structure 56 moves up and down relative to the square moving frame 535 in the square moving frame 535, and at the same time, the moving telescopic structure 56 can drive the negative pressure box 53 to move along the guide rail 532 through the limit portions 536.

[0068] In one embodiment of the present invention, the conveyor 2 is a double-belt conveyor.

[0069] In one embodiment of the present invention, the driving vehicle body 1 is a crawler tractor.

[0070] In one embodiment of the present invention, the planting medium is granular, and the planting medium includes peat particles.

[0071] In one embodiment of the present invention, a plurality of seedling tray holes 341 are disposed on the seedling tray 34 .

[0072] In one embodiment of the present invention, a support column 342 is respectively disposed at the four corners of the bottom surface of the seedling tray 34, so that the seedling tray 34 can be directly inserted into the field.

[0073] When the present invention is used, a plurality of vertically stacked seedling trays are placed above the conveyor 2, and the output ends of the two first telescopic mechanisms 32 are simultaneously contracted, so that the seedling trays of the lowest layer fall onto the conveyor 2. At this time, the output ends of the two second telescopic mechanisms 33 block the seedling trays of the second to last layer and above above the conveyor 2; the output ends of the two first telescopic mechanisms 32 are simultaneously extended, and the output ends of the two second telescopic mechanisms 33 are simultaneously contracted, so that the seedling trays blocked by the two second telescopic mechanisms 33 fall above the two first telescopic mechanisms 32; through the cooperation of the two first telescopic mechanisms 32 and the two second telescopic mechanisms 33, a plurality of vertically stacked seedling trays can be placed on the conveyor 2 in sequence.

[0074] The conveyor 2 drives the seedling tray 34 to move to the bottom of the first soil covering structure 4, and the planting medium is placed on the seedling tray 34 for the first time through the first soil covering structure 4. The seedling tray 34 continues to move to the bottom of the rolling roller 8, and the rolling roller 8 rotates following the movement of the seedling tray 34. At the same time, a number of protrusions 81 squeeze the sowing medium to form a number of pits; the seedling tray 34 moves to one side of the seed placement box 55, and the seed adsorption mechanism 54 is driven by the mobile telescopic structure 56 to move above the seed placement box 55 to adsorb the seeds. The mobile telescopic structure 56 drives the seed adsorption mechanism 54 to move above the seedling tray 34, and the seeds adsorbed by the several suction nozzles are placed into the corresponding pits, which effectively avoids the phenomenon of missing seedlings; then the seedling tray 34 continues to move to the bottom of the second soil covering structure 6, and the planting medium is placed for the second time, and the seeds in the pits are covered with the planting medium.

[0075] The seedling tray 34 continues to move to the bottom of the clamping frame 73, and the two clamping claws 75 are moved to the two sides of the seedling tray 34 through the vertical telescopic structure 72. The clamping telescopic structure 74 drives the clamping claws 75 to horizontally approach the seedling tray 34. After the two clamping claws 75 clamp the seedling tray 34, the horizontal telescopic structure 76 drives the seedling tray 34 to move above the yielding groove 10, and then the vertical telescopic structure 72 is used to lower the seedling tray 34 from the yielding groove 10, so that the seedling tray 34 can be directly placed in the field or directly stacked at a designated position.

[0076] The above generally describes the present invention in detail, but it is obvious to a person skilled in the art that some modifications or improvements can be made to the present invention. Therefore, modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A rice seedling raising precision seeder, characterized in that: It comprises a driving vehicle body, on which a conveyor is rotatably arranged; a seedling tray structure, a first soil covering structure, a sowing structure, a second soil covering structure and a pick-up and place mechanism are sequentially arranged in the conveying direction of the conveyor; The seedling tray structure is used to place the seedling tray on the conveyor, and the first soil covering structure is used to place the planting medium on the seedling tray; The sowing structure is used to place the seeds in the seedling tray; The second soil covering structure is used to place the seeds in the seedling tray as a planting medium, and the taking and placing mechanism is used to place the seedling tray at a corresponding position.

2. The rice seedling raising precision seeder according to claim 1, characterized in that: The seedling tray structure includes a placement frame, two first telescopic mechanisms, two second telescopic mechanisms and a plurality of seedling trays. The placement frame is connected to a driving vehicle body, and the placement frame is used to place a plurality of vertically stacked seedling trays; the seedling trays are arranged above a conveyor; the two first telescopic mechanisms are symmetrically arranged on both sides of the conveyor, and the two second telescopic mechanisms are symmetrically arranged on both sides of the conveyor; the output end of the first telescopic mechanism is located below the output end of the second telescopic mechanism; the two first telescopic mechanisms are used to block or release the seedling tray located at the bottom layer; the two second telescopic mechanisms are used to block or release the seedling tray located at the second to last layer.

3. The rice seedling raising precision seeder according to claim 2, characterized in that: The first soil covering structure and the second soil covering structure both include a shell, a feed shaft is rotatably arranged inside the shell, a plurality of fixing rods are arranged on the outer circumference of the feed shaft, a soil covering motor is arranged on the shell, and the output end of the soil covering motor is drivingly connected with the feed shaft; a filter is arranged at the bottom of the shell.

4. The rice seedling raising precision seeder according to claim 1, characterized in that: The sowing structure includes a sowing frame, a vacuum pump, a negative pressure box, a seed placement box, and a movable telescopic structure; the negative pressure box is provided with a seed adsorption mechanism; the seed placement box is arranged on one side of the conveyor for placing seeds; the sowing frame is connected to the driving vehicle body, the vacuum pump is fixed on the sowing frame, the vacuum pump is connected to the negative pressure box, and the vacuum pump is used to form a negative pressure in the negative pressure box; the seed adsorption mechanism is connected to the inside of the negative pressure box for adsorbing or releasing seeds, the movable telescopic structure is connected to the driving vehicle body, the output end of the movable telescopic structure is connected to the negative pressure box, the movable telescopic structure is used to drive the negative pressure box to move relative to the seed placement box and the conveyor, and the negative pressure box is arranged above the conveyor.

5. The rice seedling raising precision seeder according to claim 1, characterized in that: The negative pressure box is symmetrically and rotatably provided with two guide wheels on both sides, and the sowing frame is symmetrically provided with two guide rails; each guide wheel is rotatably connected to a guide rail, and the negative pressure box and the seed placement box are arranged between the two guide rails.

6. The rice seedling raising precision seeder according to claim 5, characterized in that: A guide groove is provided on the guide rail. The guide groove is used to drive the negative pressure box to descend relative to the seed placement box when the negative pressure box moves above the seedling tray, so that the seed adsorption mechanism at the lower end of the negative pressure box is close to the seedling tray on the conveyor, so that the seeds fall on the seedling tray; the horizontal height of the upper end of the seed placement box is higher than the upper end of the seed tray that moves with the conveyor.

7. The rice seedling raising precision seeder according to claim 1, characterized in that: A rolling roller is arranged between the first soil covering structure and the negative pressure box, and a plurality of protrusions are arranged on the outer circumference of the rolling roller. The rolling roller is rotatably arranged above the conveyor. When the seedling tray with the sowing medium placed by the first soil covering structure passes under the rolling roller, the rolling roller rotates with the sowing medium of the seedling tray, and at the same time, the plurality of protrusions squeeze the sowing medium to form a plurality of pits.

8. The rice seedling raising precision seeder according to claim 7, characterized in that: A plurality of adsorption grooves are arranged at the lower end of the negative pressure box, and the plurality of adsorption grooves are arranged corresponding to the plurality of seed placement grooves. Each adsorption groove is provided with a plurality of suction nozzles, and the suction nozzles are communicated with the interior of the negative pressure box.

9. The rice seedling raising precision seeder according to claim 8, characterized in that: The number of the suction nozzles is set corresponding to the number of the pits squeezed out by the rolling roller on the seedling tray.

10. The rice seedling raising precision seeder according to claim 1, characterized in that: The pick-and-place mechanism includes a horizontal moving frame, a vertical telescopic structure, a clamping frame, two clamping telescopic structures, two clamping claws and a horizontal telescopic structure; the lower end of the horizontal moving frame is slidably arranged on the driving vehicle body, the two ends of the vertical telescopic structure are respectively connected to the clamping frame and the horizontal moving frame, the vertical telescopic structure is arranged above the conveyor, the two clamping telescopic structures are symmetrically arranged on the clamping frame, and the output end of each clamping telescopic structure is connected to a clamping claw; the two clamping claws are symmetrically arranged; the vertical telescopic structure is used to drive the clamping claw to move vertically relative to the conveyor; one end of the horizontal telescopic structure is connected to the driving vehicle body, and the other end is connected to the horizontal moving frame; the horizontal telescopic structure is used to drive the clamping claw to move horizontally, and the two clamping claws are used to clamp the seedling tray; a make way groove for making way for the clamping frame is arranged on the driving vehicle body.

Images