A crop seeder

Abstract

The present invention relates to the technical field of sowing, and discloses a crop seeder, comprising a traveling frame, a main box, a wrapping and conveying assembly, and a seed ball screening assembly, wherein the main box is fixedly arranged on the traveling frame, the seed ball screening assembly is arranged on the main box, and the wrapping and conveying assembly is arranged in the main box. The present invention specifically provides a crop seeder that relies on large-diameter conveying belts and semicircular wrapping rods in two double-sided wrapping units to spread seed balls without causing mutual wear between the seed balls and the narrow and long pipes.

Description

Technical Field

[0001] The invention relates to the technical field of sowing, in particular to a crop seeder. Background Art

[0002] In existing agricultural sowing technology, pelletizing equipment is often used to coat seeds with pesticides, fertilizers, growth regulators, water retaining agents, oxygen enhancers and other additives to form seed pellets.

[0003] An invention patent with application number 202410573036.2 discloses a rapeseed sowing box with an early warning function, and specifically discloses the technical solution that "the impact rod can continuously hit the hose during rotation, and the hose can prevent rapeseed seeds from accumulating and clogging in the hose during the impact process, thereby ensuring that the seeds can be completely sown."

[0004] Although the technical solution of the application has a good sowing effect, the way to transport seeds from the top of the seeder to the soil mainly relies on the seeds falling under their own weight in the hose. In the narrow and long pipe, the falling seeds will wear against the inner wall of the pipe, causing certain damage to the seeds (especially the additives on the outer layer of the seed balls), and easily clogging the pipe. Summary of the invention

[0005] In view of the above situation and to overcome the defects of the prior art, the present invention provides a crop seeder. In order to solve the problem in the prior art that seeds are sown on the soil through narrow pipes, which easily wears out the additives on the outer layer of the seed balls, the present invention proposes a crop seeder that relies on large-diameter conveyor belts and semicircular wrapping rods in two double-sided wrapping units to sow seed balls without causing mutual wear between the seed balls and the narrow pipes.

[0006] The technical solution adopted by the present invention is as follows: A crop seeder, comprising a traveling frame, a main box, a package conveying assembly and a seed ball screening assembly, wherein the main box is fixedly arranged on the traveling frame, the seed ball screening assembly is arranged on the main box, and the package conveying assembly is arranged in the main box;

[0007] The parcel conveying assembly comprises a double-sided parcel unit, wherein the double-sided parcel unit is arranged in a main box body, and the double-sided parcel unit comprises an upper transmission shaft, a lower transmission shaft, a large wheel diameter conveying belt and a semicircular parcel rod, wherein the upper transmission shaft is rotatably arranged in the main box body, and the lower transmission shaft is rotatably arranged in the main box body, and the upper transmission shaft is located directly above the lower transmission shaft, and large pulleys are fixedly arranged on the upper transmission shaft and the lower transmission shaft, and the large wheel diameter conveying belt is sleeved between two large pulleys, and a plurality of semicircular through grooves are evenly spaced on the large wheel diameter conveying belt, and a plurality of limiting dovetail grooves are evenly spaced on the large wheel diameter conveying belt, and the plurality of limiting dovetail grooves are connected one by one with the plurality of semicircular through grooves, and the semicircular parcel rod is slidably arranged in the limiting dovetail grooves and the semicircular through grooves;

[0008] A wrapping recess is provided at one end of the semicircular wrapping rod close to the semicircular through groove, and the double-sided wrapping unit includes two semicircular wrapping rods, the two semicircular wrapping rods abut against each other, and the two wrapping recesses are connected to each other. An iron ball is rollingly engaged at one end of the semicircular wrapping rod away from the semicircular through groove, and the double-sided wrapping unit also includes a first end face cam and a second end face cam, the first end face cam and the second end face cam are respectively located on both sides of the large wheel diameter conveyor belt, the first end face cam is fixedly connected to the main box body, and the second end face cam is fixedly connected to the main box body, the cross-sectional profile of the first end face cam in the direction perpendicular to the axis of the upper transmission shaft is the same as that of the large wheel diameter conveyor belt, the cross-sectional profile of the second end face cam in the direction perpendicular to the axis of the upper transmission shaft is the same as that of the large wheel diameter conveyor belt, the bottom of the first end face cam is provided with a lower protruding section facing the large wheel diameter conveyor belt, and the top and bottom of the second end face cam are provided with upper and lower recessed sections facing the large wheel diameter conveyor belt, and the two iron balls are respectively slidably fitted on the first end face cam and the second end face cam.

[0009] Furthermore, the double-sided wrapping unit also includes a small wheel diameter synchronous belt and two small pulleys, the two small pulleys are respectively fixed on the upper transmission shaft and the lower transmission shaft, and the small wheel diameter synchronous belt is sleeved between the two small pulleys.

[0010] Furthermore, the package conveying assembly includes two bilaterally symmetrically arranged double-sided wrapping units, and the large-wheel diameter conveying belts of the two bilaterally symmetrical wrapping units are fitted and connected.

[0011] Furthermore, the parcel transport assembly also includes a transport drive motor and two transport transmission gears. The transport drive motor is fixed in the main box body, and the output end of the transport drive motor is fixedly connected to a transmission shaft. The two transport transmission gears are respectively fixed on the upper transmission shafts of two double-sided parcel units, and the two transport transmission gears are meshed and connected.

[0012] Furthermore, the seed ball screening assembly includes a screening box, a crushing box, a seed ball hopper, a lower opening vortex frame, a cone top frame, a connecting straight pipe, a screening gear ring, a connecting spoke, a screening motor and a screening gear, the crushing box is fixedly arranged on the main box body, the screening box is fixedly arranged on the crushing box, the seed ball hopper is fixedly arranged in the screening box, the bottom of the seed ball funnel extends into the main box body, the bottom of the seed ball funnel is located directly above the large wheel diameter conveyor belt, the lower opening vortex frame is rotatably arranged in the screening box, the cone top frame is rotatably and fitly arranged in the screening box, the connecting straight pipe is fixedly arranged between the cone top frame and the lower opening vortex frame, the screening gear ring is rotatably arranged in the screening box, the connecting spoke is fixedly arranged between the screening gear ring and the lower opening vortex frame, the screening motor is fixedly arranged on the screening box, the screening gear is fixedly arranged on the output end of the screening motor, and the screening gear is meshedly connected with the screening gear ring.

[0013] Furthermore, the first end face cam and the second end face cam are both made of magnetic materials, there is a magnetic attraction between the first end face cam and the adjacent iron beads, and there is a magnetic attraction between the second end face cam and the adjacent iron beads.

[0014] Furthermore, a connecting frame is fixedly provided at one end of the walking frame, and the main box body, the package conveying assembly and the seed ball screening assembly are all provided in multiple groups in a linear array.

[0015] Furthermore, a release cutout is provided at the bottom of the seed ball funnel, and the shortest distance between the top of the release cutout and the large wheel diameter conveyor belt is smaller than the seed ball radius.

[0016] The beneficial effects achieved by the present invention using the above structure are as follows:

[0017] 1. The rotation of the lower opening vortex frame has a driving effect on the seed balls inside, causing the seed balls to gradually move from the edge of the screening box to the center of the screening box. In this process, the seed ball fragments in the lower opening vortex frame will fall into the fragment box from the fragment discharge hole, preventing subsequent fragments from entering the package delivery component, and further preventing the fragments from being regarded as intact seed balls and sown into the soil, thereby wasting soil resources.

[0018] 2. In the process from the bottom of the screening box to being sown on the soil, the seed balls do not descend by their own weight, and there is no large relative movement between them and the adjacent semicircular wrapping rods with wrapping notches, thereby avoiding the problem of seed balls being blocked in narrow pipes in terms of transportation, and further avoiding the loss of additives caused by the friction between the seed balls and the narrow pipes. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The figure is a three-dimensional schematic diagram of a crop seeder of the present invention.

[0020] Figure 2The present invention is a cross-sectional schematic diagram of a crop seeder.

[0021] Figure 3 It is a three-dimensional schematic diagram of the main box body, screening box, crushing box and screening motor of the present invention.

[0022] Figure 4 It is a schematic diagram of the internal structure of the main box of the present invention.

[0023] Figure 5 It is a three-dimensional schematic diagram of the conveying drive motor, the conveying transmission gear and the double-sided wrapping unit of the present invention.

[0024] Figure 6 It is a three-dimensional schematic diagram of the second end face cam of the present invention.

[0025] Figure 7 It is a three-dimensional schematic diagram of the large wheel diameter conveyor belt of the present invention.

[0026] Figure 8 It is a three-dimensional schematic diagram of the semicircular wrapped rod and the iron bead of the present invention.

[0027] Fig. 9 It is a cross-sectional schematic diagram of the seed pellet screening assembly of the present invention.

[0028] Fig.10 It is a three-dimensional schematic diagram of the lower opening scroll frame, the screening gear ring, the connecting spokes and the screening gear of the present invention.

[0029] Fig.11 It is a three-dimensional schematic diagram of the screening box of the present invention.

[0030] Fig.12 It is a three-dimensional schematic diagram of the seed pellet hopper of the present invention.

[0031] Fig.13 It is a three-dimensional schematic diagram of the lower opening vortex frame, the connecting straight pipe and the cone top frame of the present invention.

[0032] Among them, 1. walking frame, 101. connecting frame, 2. main box, 201. bottom leakage hole, 3. package conveying component, 301. conveying drive motor, 302. conveying transmission gear, 4. double-sided wrapping unit, 401. upper transmission shaft, 402. lower transmission shaft, 403. small wheel diameter synchronous belt, 4031. small pulley, 404. large wheel diameter conveyor belt, 4041. large pulley, 405. semicircular through groove, 406. limit dovetail groove, 407. semicircular wrapping rod, 4071. wrapping notch, 408. Iron bead; 409. First end face cam; 4091. Lower raised section; 410. Second end face cam; 4101. Upper and lower recessed sections; 5. Seed ball screening assembly; 501. Screening box; 5011. Crushed piece discharge hole; 502. Crushed material box; 503. Seed ball hopper; 5031. Release incision; 504. Lower opening vortex frame; 505. Cone top frame; 506. Connecting straight pipe; 507. Screening gear ring; 508. Connecting spokes; 509. Screening motor; 510. Screening gear.

[0033] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0035] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0036] like Figure 1 to Figure 13 As shown, a crop seeder comprises a traveling frame 1, a main box 2, a package conveying assembly 3 and a seed pellet screening assembly 5, wherein the main box 2 is fixedly arranged on the traveling frame 1, the seed pellet screening assembly 5 is arranged on the main box 2, and the package conveying assembly 3 is arranged in the main box 2;

[0037] The package conveying assembly 3 includes a double-sided wrapping unit 4, which is arranged in the main box body 2. The double-sided wrapping unit 4 includes an upper transmission shaft 401, a lower transmission shaft 402, a large wheel diameter conveying belt 404 and a semicircular wrapping rod 407. The upper transmission shaft 401 is rotatably arranged in the main box body 2, and the lower transmission shaft 402 is rotatably arranged in the main box body 2. The upper transmission shaft 401 is located directly above the lower transmission shaft 402. The upper transmission shaft 401 and the lower transmission shaft 402 are arranged in a direction opposite to each other. 02 are fixed with large pulleys 4041, the large wheel diameter conveyor belt 404 is sleeved between the two large pulleys 4041, a plurality of semicircular through grooves 405 are evenly spaced on the large wheel diameter conveyor belt 404, a plurality of position-limiting dovetail grooves 406 are evenly spaced on the large wheel diameter conveyor belt 404, the plurality of position-limiting dovetail grooves 406 are connected one by one with the plurality of semicircular through grooves 405, and the semicircular wrapping rod 407 is slidably disposed in the position-limiting dovetail grooves 406 and the semicircular through grooves 405;

[0038] The semicircular wrapping rod 407 is provided with a wrapping recess 4071 at one end close to the semicircular through groove 405, and the double-sided wrapping unit 4 includes two semicircular wrapping rods 407, the two semicircular wrapping rods 407 are abutted against each other, and the two wrapping recesses 4071 are connected to each other. The end of the semicircular wrapping rod 407 away from the semicircular through groove 405 is rollingly engaged with an iron ball 408, and the double-sided wrapping unit 4 also includes a first end face cam 409 and a second end face cam 410, the first end face cam 409 and the second end face cam 410 are respectively located on both sides of the large wheel diameter conveyor belt 404, the first end face cam 409 is fixedly connected to the main box body 2, and the second end face cam 410 is fixedly connected to the main box body 2, the cross-sectional profile of the first end face cam 409 in the direction perpendicular to the axis of the upper transmission shaft 401 is the same as that of the large wheel diameter conveyor belt 404, the cross-sectional profile of the second end face cam 410 in the direction perpendicular to the axis of the upper transmission shaft 401 is the same as that of the large wheel diameter conveyor belt 404, the bottom of the first end face cam 409 is provided with a lower raised section 4091 facing the large wheel diameter conveyor belt 404, the top and bottom of the second end face cam 410 are provided with upper and lower recessed sections 4101 facing the large wheel diameter conveyor belt 404, and the two iron beads 408 are respectively slidably fitted on the first end face cam 409 and the second end face cam 410.

[0039] like Figure 1 to Figure 13 As shown, the double-sided wrapping unit 4 also includes a small wheel diameter synchronous belt 403 and two small pulleys 4031 . The two small pulleys 4031 are respectively fixed on the upper transmission shaft 401 and the lower transmission shaft 402 , and the small wheel diameter synchronous belt 403 is sleeved between the two small pulleys 4031 .

[0040] like Figure 1 to Figure 13As shown, the package conveying assembly 3 includes two bilaterally symmetrically arranged double-sided wrapping units 4, and the large-wheel diameter conveying belts 404 of the two bilaterally symmetrically arranged double-sided wrapping units 4 are closely connected.

[0041] like Figure 1 to Figure 13 As shown, the package transport component 3 also includes a transport drive motor 301 and two transport transmission gears 302. The transport drive motor 301 is fixedly arranged in the main box body 2. The output end of the transport drive motor 301 is fixedly connected to a transmission shaft. The two transport transmission gears 302 are respectively fixedly arranged on the upper transmission shafts 401 of the two double-sided package units 4, and the two transport transmission gears 302 are meshed and connected.

[0042] like Figure 1 to Figure 13 As shown, the seed pill screening assembly 5 includes a screening box 501, a crushing box 502, a seed pill hopper 503, a lower opening vortex frame 504, a cone top frame 505, a connecting straight pipe 506, a screening gear ring 507, connecting spokes 508, a screening motor 509 and a screening gear 510. The crushing box 502 is fixedly arranged on the main box body 2, the screening box 501 is fixedly arranged on the crushing box 502, the seed pill hopper 503 is fixedly arranged in the screening box 501, the bottom of the seed pill hopper 503 extends into the main box body 2, and the bottom of the seed pill hopper 503 is located directly above the large wheel diameter conveyor belt 404. The lower opening vortex frame 504 is rotatably arranged in the screening box 501, the cone top frame 505 is rotatably fitted in the screening box 501, the connecting straight pipe 506 is passed through and fixed between the cone top frame 505 and the lower opening vortex frame 504, the screening gear ring 507 is rotatably arranged in the screening box 501, the connecting spokes 508 are fixed between the screening gear ring 507 and the lower opening vortex frame 504, the screening motor 509 is fixed on the screening box 501, the screening gear 510 is fixed on the output end of the screening motor 509, and the screening gear 510 is meshed and connected with the screening gear ring 507.

[0043] like Figure 1 to Figure 13 As shown, the first end face cam 409 and the second end face cam 410 are both made of magnetic materials. There is a magnetic attraction between the first end face cam 409 and the adjacent iron bead 408 , and there is a magnetic attraction between the second end face cam 410 and the adjacent iron bead 408 .

[0044] like Figure 1 to Figure 13 As shown, a connecting frame 101 is fixedly provided at one end of the walking frame 1, and the main box body 2, the package conveying assembly 3 and the seed ball screening assembly 5 are all provided in multiple groups in a linear array.

[0045] like Figure 1 to Figure 13 As shown, a release cutout 5031 is provided at the bottom of the seed ball funnel 503, and the shortest distance between the top of the release cutout 5031 and the large wheel diameter conveyor belt 404 is smaller than the seed ball radius.

[0046] During specific use, the agricultural vehicle is connected to the traveling frame 1 through the connecting frame 101, and the package conveying assembly 3 and the seed ball screening assembly 5 on the traveling frame 1 are driven to move at a uniform speed along the field.

[0047] The seed pellet screening assembly 5 is first operated, the screening motor 509 rotates, and the meshing screening gear ring 507 is driven to rotate through the screening gear 510, and further driven to rotate synchronously with the lower opening vortex frame 504 through the connecting spokes 508 (because the connecting straight pipe 506 is fixed between the lower opening vortex frame 504 and the cone top frame 505, the cone top frame 505 also rotates synchronously with the lower opening vortex frame 504). The rotation of the cone top frame 505 causes the seed pellets in the screening box 501 to gradually fall into the lower opening vortex frame 504 from the connecting straight pipe 506. The rotation of the lower opening vortex frame 504 has a driving effect on the seed pellets inside, causing the seed pellets to gradually move from the edge of the screening box 501 to the center of the screening box 501. During this process, the seed pellets in the lower opening vortex frame 504 will fall into the pellet box 502 through the pellet discharge hole 5011, preventing subsequent pellets from entering the package delivery component 3, and further preventing the pellets from being scattered into the soil as intact seed pellets, thereby wasting soil resources.

[0048] After the gathering effect of the lower opening vortex frame 504 and the screening effect of the fragment discharge hole 5011, the intact seed balls move to the middle of the screening box 501, fall from the seed ball funnel 503, and flow to the large wheel diameter conveyor belt 404.

[0049] In the package conveying assembly 3, the driving force of the conveying drive motor 301 drives the directly connected upper transmission shaft 401 to rotate. Since the upper transmission shafts 401 in the two bilaterally symmetrical double-sided wrapping units 4 are meshed and transmitted through the conveying transmission gears 302, the driving force of the conveying drive motor 301 can drive the upper transmission shafts 401 in the two double-sided wrapping units 4 to move in opposite directions at the same rate. Through the power transmission of the small pulley 4031 and the small wheel diameter synchronous belt 403, the upper transmission shaft 401 and the lower transmission shaft 402 in the double-sided wrapping unit 4 rotate synchronously. Therefore, the large wheel diameter conveying belts 404 in the two sets of double-sided wrapping units 4 can move in opposite directions at the same rate in a state of being in close contact with each other.

[0050] During the periodic rotation of the large-diameter wheel conveyor belt 404 located directly below the seed ball funnel 503, when the semicircular through groove 405 and the semicircular wrapping rod 407 rotate to directly below the seed ball funnel 503, since the wrapping recess 4071 is provided on the semicircular wrapping rod 407, the seed balls at the bottom of the seed ball funnel 503 are no longer supported by the large-diameter wheel conveyor belt 404 from the bottom. Such seed balls leave the constraint of the bottom of the seed ball funnel 503 through the release cutout 5031 and enter the wrapping recess 4071.

[0051] The seed balls entering the wrapping recess 4071 rotate with the large wheel diameter conveyor belt 404. When the semicircular wrapping rods 407 in the two sets of double-sided wrapping units 4 fit together at the symmetric planes of the double-sided wrapping units 4, the seed balls are completely wrapped in the wrapping recess 4071 at the ends of the semicircular wrapping rods 407 until the seed balls move to the bottom of the main box 2 with the large wheel diameter conveyor belt 404. When the seed balls and the large wheel diameter conveyor belt 404 move to the bottom of the main box 2, the semicircular wrapping rods 407 in the two sets of double-sided wrapping units 4 separate from each other and release the seed balls. The released seed balls fall from the bottom leakage hole 201.

[0052] When the seed balls flow along the large wheel diameter conveyor belt 404, the iron ball 408 at the end of the semicircular wrapping rod 407 is magnetically attracted to the adjacent first end face cam 409 (or the adjacent second end face cam 410), and the lower raised section 4091 (or the upper and lower recessed sections 4101) push the iron ball 408 and the semicircular wrapping rod 407 to slide along the length direction of the semicircular through groove 405. Through the coordinated use of the first end face cam 409 and the second end face cam 410, when the seed balls fall from the seed ball funnel 503 to the wrapping recess 4071 at the top of the large wheel diameter conveyor belt 404, the two semicircular wrapping rods 407 in the semicircular through groove 405 can maintain a certain distance to facilitate the entry of the seed balls. Similarly, when the seed balls flow downward from the symmetrical surfaces of the two sets of double-sided wrapping units 4, the first end cam 409 and the second end cam 410 can press the semicircular wrapping rod 407 through the iron bead 408 to prevent the seed balls from shaking randomly and causing significant wear. Similarly, when the seed balls are close to the bottom of the main box 2, the lower raised section 4091 and the upper and lower recessed sections 4101 at the bottom of the second end cam 410 will drive the two semicircular wrapping rods 407 to slide in the same direction through the iron bead 408, thereby prompting the seed balls to move away from the large wheel diameter conveyor belt 404 in the length direction of the upper transmission shaft 401 and enter the bottom leakage hole 201, preventing the seed balls released from the wrapping recess 4071 from being too close to the large wheel diameter conveyor belt 404 and causing wear.

[0053] In the process from the bottom of the screening box 501 to being sown on the soil, the seed balls do not descend by their own weight, and there is no large relative movement between the adjacent semicircular wrapping rod 407 with the wrapping recess 4071, thereby avoiding the problem of blockage of the seed balls in the narrow pipe from the transportation method, and further avoiding the loss of additives caused by the friction between the seed balls and the narrow pipe.

[0054] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A crop seeder, characterized in that: The invention comprises a walking frame (1), a main box (2), a package conveying assembly (3) and a seed ball screening assembly (5), wherein the main box (2) is fixedly arranged on the walking frame (1), the seed ball screening assembly (5) is arranged on the main box (2), and the package conveying assembly (3) is arranged in the main box (2); The parcel conveying assembly (3) comprises a double-sided parcel conveying unit (4), the double-sided parcel conveying unit (4) being arranged in the main box (2), the double-sided parcel conveying unit (4) comprising an upper transmission shaft (401), a lower transmission shaft (402), a large-diameter conveying belt (404) and a semicircular parcel conveying rod (407), the upper transmission shaft (401) being rotatably arranged in the main box (2), the lower transmission shaft (402) being rotatably arranged in the main box (2), the upper transmission shaft (401) being located directly above the lower transmission shaft (402), the upper transmission shaft (401) and the lower transmission shaft (402) being rotatably arranged in the main box (2), A large pulley (4041) is fixedly provided on each of the moving shafts (402); the large wheel diameter conveying belt (404) is sleeved between the two large pulleys (4041); a plurality of semicircular through grooves (405) are evenly spaced on the large wheel diameter conveying belt (404); a plurality of position-limiting dovetail grooves (406) are evenly spaced on the large wheel diameter conveying belt (404); the plurality of position-limiting dovetail grooves (406) are connected to the plurality of semicircular through grooves (405) one by one; and the semicircular wrapping rod (407) is slidably provided in the position-limiting dovetail grooves (406) and the semicircular through grooves (405); The semicircular wrapping rod (407) has a wrapping recess (4071) at one end close to the semicircular through groove (405). The double-sided wrapping unit (4) comprises two semicircular wrapping rods (407), the two semicircular wrapping rods (407) are in contact with each other, the two wrapping recesses (4071) are connected to each other, and the end of the semicircular wrapping rod (407) away from the semicircular through groove (405) is provided with an iron ball (408) for rolling engagement. The double-sided wrapping unit (4) further comprises a first end face cam (409) and a second end face cam (410). The first end face cam (409) and the second end face cam (410) are respectively located on two sides of the large wheel diameter conveyor belt (404). The first end face cam (409) is fixedly connected to the main box body (2). The second end face cam (410) is fixedly connected to the main box body (2). The wheel (410) is fixedly connected to the main box (2); the cross-sectional profile of the first end face cam (409) in a direction perpendicular to the axis of the upper transmission shaft (401) is the same as that of the large wheel diameter conveyor belt (404); the cross-sectional profile of the second end face cam (410) in a direction perpendicular to the axis of the upper transmission shaft (401) is the same as that of the large wheel diameter conveyor belt (404); the bottom of the first end face cam (409) is provided with a lower raised section (4091) facing the large wheel diameter conveyor belt (404); the top and bottom of the second end face cam (410) are both provided with upper and lower recessed sections (4101) facing the large wheel diameter conveyor belt (404); and the two iron beads (408) are respectively slidably fitted on the first end face cam (409) and the second end face cam (410).

2. A crop seeder according to claim 1, characterized in that: The double-sided wrapping unit (4) further comprises a small wheel diameter synchronous belt (403) and two small pulleys (4031); the two small pulleys (4031) are respectively fixed on the upper transmission shaft (401) and the lower transmission shaft (402); and the small wheel diameter synchronous belt (403) is sleeved between the two small pulleys (4031).

3. A crop seeder according to claim 2, characterized in that: The parcel conveying assembly (3) comprises two bilaterally symmetrically arranged double-sided wrapping units (4), and the large-wheel-diameter conveying belts (404) of the two bilaterally symmetrically arranged double-sided wrapping units (4) are closely connected.

4. The crop seeder according to claim 3, characterized in that: The parcel transport assembly (3) further comprises a transport drive motor (301) and two transport transmission gears (302); the transport drive motor (301) is fixedly arranged in the main box (2); the output end of the transport drive motor (301) is fixedly connected to a transmission shaft; the two transport transmission gears (302) are respectively fixedly arranged on the upper transmission shafts (401) of the two double-sided parcel units (4); and the two transport transmission gears (302) are meshedly connected.

5. The crop seeder according to claim 4, characterized in that: The seed ball screening assembly (5) comprises a screening box (501), a crushing box (502), a seed ball funnel (503), a lower opening vortex frame (504), a cone-top frame (505), a connecting straight pipe (506), a screening gear ring (507), connecting spokes (508), a screening motor (509) and a screening gear (510), wherein the crushing box (502) is fixedly mounted on the main box body (2), the screening box (501) is fixedly mounted on the crushing box (502), the seed ball funnel (503) is fixedly mounted in the screening box (501), the bottom of the seed ball funnel (503) extends into the main box body (2), and the bottom of the seed ball funnel (503) is located directly above the large wheel diameter conveyor belt (404). The lower open vortex frame (504) is rotatably disposed in the screening box (501), the cone-top frame (505) is rotatably fitted in the screening box (501), the connecting straight pipe (506) is passed through and fixed between the cone-top frame (505) and the lower open vortex frame (504), the screening gear ring (507) is rotatably disposed in the screening box (501), the connecting spokes (508) are fixedly disposed between the screening gear ring (507) and the lower open vortex frame (504), the screening motor (509) is fixedly disposed on the screening box (501), the screening gear (510) is fixedly disposed on the output end of the screening motor (509), and the screening gear (510) is meshingly connected with the screening gear ring (507).

6. The crop seeder according to claim 5, characterized in that: The first end face cam (409) and the second end face cam (410) are both made of magnetic material, and there is a magnetic attraction force between the first end face cam (409) and the adjacent iron bead (408), and there is a magnetic attraction force between the second end face cam (410) and the adjacent iron bead (408).

7. The crop seeder according to claim 6, characterized in that: A connecting frame (101) is fixedly provided at one end of the walking frame (1), and the main box (2), the package transport component (3) and the seed ball screening component (5) are all provided in a plurality of groups in a linear array.

8. The crop seeder according to claim 7, characterized in that: A release cutout (5031) is provided at the bottom of the seed ball funnel (503), and the shortest distance between the top of the release cutout (5031) and the large wheel diameter conveyor belt (404) is smaller than the seed ball radius.

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