Sowing device and returning seeder

Abstract

The invention relates to the field of agricultural machinery, in particular to a seeding device and a returning seeder. The seeding device comprises a seed pipe, a rotary drum and a rotation driving part, a hole opening mechanism and a seed falling mechanism which are staggered are arranged on the rotary drum in the circumferential direction at intervals, the hole opening mechanism comprises a sleeve fixed to the rotary drum and a telescopic shaft arranged in the sleeve in a sliding mode, and a telescopic driving part is arranged in the sleeve; a limiting disc and a conical head are sequentially arranged on the portion, located outside the sleeve, of the telescopic shaft, the conical head is fixed to the end of the telescopic shaft and used for being inserted into a soil layer under the driving effect of the telescopic driving piece to open a hole, and the limiting disc is in sliding fit with the telescopic shaft and provided with a triggering part. The trigger part can synchronously slide along the telescopic shaft along with the limiting disc to rise to a specific height and then make contact with a travel switch arranged in the sleeve, and the travel switch controls the telescopic driving piece to drive the telescopic shaft and the conical head to rise. According to the invention, the seeding spacing is convenient to adjust, the seeding efficiency is improved, and the consistency of hole opening depth is improved.

Description

Technical Field

[0001] The invention relates to the field of agricultural machinery, in particular to a sowing device and a field returning sowing machine. Background Art

[0002] In the process of sowing by the existing sowing device, the sowing opening is fixed in position, which makes it impossible to adjust the sowing spacing according to the actual situation. In addition, the soil layer needs to be trenched or dug before sowing, which reduces the overall practicality and efficiency of the sowing device.

[0003] In addition, in the straw return and sowing machine, the roots of the straw need to be crushed when processing the straw, which causes the flatness of the soil layer to be destroyed. Therefore, if the furrows are dug and sown at a consistent depth at this time, the seed pits will be too deep or too shallow, which will be unfavorable for the subsequent germination and growth after sowing the seeds, and thus affect the planting rate and harvest of crops. Summary of the invention

[0004] The present invention aims to provide a seeding device and a field returning seeding machine, which are convenient for adjusting the seeding spacing, improving the seeding efficiency and improving the consistency of the hole opening depth.

[0005] In order to solve the above technical problems, the specific scheme adopted by the present invention is: a sowing device, including a seed material tube, a rotating drum concentrically sleeved on the outer circumference of the seed material tube, and a rotating driving member for driving the rotating drum to rotate, wherein staggered opening mechanisms and seed dropping mechanisms are arranged at intervals along the circumferential direction on the rotating drum; The seed dropping mechanism comprises a seed dropping cylinder fixed on the rotating cylinder, an end of the seed dropping cylinder away from the rotating cylinder is provided with an openable end cap, a leakage hole is provided at the lower edge of the seeding tube, and a middle hole is provided on the rotating cylinder for connecting the leakage hole and the seed dropping cylinder after the seed dropping cylinder rotates to the leakage hole; The hole-opening mechanism includes a sleeve fixed on the rotating cylinder and a telescopic shaft slidably arranged in the sleeve along the longitudinal direction. A telescopic driving member for driving the telescopic shaft to extend and retract is provided in the sleeve. A limit plate and a cone head are sequentially provided on the part of the telescopic shaft located outside the sleeve. The cone head is fixed on the end of the telescopic shaft and is used to insert into the soil layer to open a hole under the driving action of the telescopic driving member. The limit plate is slidably matched with the telescopic shaft, and a trigger part is provided on the limit plate. The trigger part can synchronously slide along the telescopic shaft with the limit plate and rise to a specific height and then contact a travel switch arranged in the sleeve, so as to control the telescopic driving member through the travel switch to drive the telescopic shaft and the cone head to rise.

[0006] Preferably, a spring is sleeved on the telescopic shaft, one end of the spring abuts against the limit plate, and the other end of the spring abuts against a boss arranged on the telescopic shaft.

[0007] Preferably, a slip ring is slidably installed on the telescopic shaft, a slider is provided on the inner wall of the slip ring, and a slide groove is provided on the telescopic shaft which is distributed along its longitudinal direction and for the slider to slide with. Both ends of the slide groove are closed, the lower edge of the slip ring is for the trigger part to touch, and the upper edge of the slip ring is used to touch the travel switch.

[0008] Preferably, a first rubber pad is provided on the upper edge of the trigger portion, and a second rubber pad is provided on the telescopic shaft at the end of the travel of the sliding ring sliding along the sliding groove.

[0009] Preferably, the seed dropping cylinder comprises a fixed cylinder fixed on the rotating cylinder, a rotating cylinder rotatably arranged at the end of the fixed cylinder, and a motor for driving the rotating cylinder to rotate, a gear is arranged on the output shaft of the motor, the gear is meshed with a gear ring arranged on the outer periphery of the rotating cylinder, and an auger is also arranged in the rotating cylinder; A rotating ring fixed to the rotating cylinder is also concentrically provided on the outer circumference of the rotating cylinder. The end of the rotating cylinder away from the fixed cylinder penetrates through the thickness direction of the rotating ring and rotates with the rotating ring. The end cover is eccentrically hinged at the end of the rotating cylinder and is provided with a torsion spring at the hinge to enable the end cover to seal the rotating cylinder. A stop head is provided on the end cover, and a stop rod cooperating with the stop head is correspondingly provided on the rotating ring.

[0010] A field-returning seeder comprises a machine body, a field-returning device is arranged on the front side of the machine body, and any of the above-mentioned sowing devices is arranged on the rear side of the machine body.

[0011] Preferably, a mounting block for the seed pipe to be mounted in cooperation with and a lifting drive component for adjusting the lifting of the mounting block are provided at the bottom of the rear side of the machine body.

[0012] Preferably, one end of the seed pipe extends out from the mounting block and is connected to a feed pipe, and the feed pipe is connected to a silo arranged on the machine body.

[0013] The sowing device in the present invention has a hole-opening mechanism and a seed-dropping mechanism which are rotatably sleeved on the outer circumference of the seed tube, and are staggeredly arranged on the rotating drum along the circumferential direction, so that holes can be opened on the soil layer by the hole-opening mechanism respectively during the rotation of the rotating drum, and the seeds are sown in the holes by the seed-dropping mechanism, so that the hole-opening and seed-dropping are alternately performed, thereby greatly increasing the sowing efficiency. At the same time, based on the above structure, the rotation speed of the hole-opening mechanism and the seed-dropping mechanism can be adjusted accordingly by adjusting the rotation speed of the rotating drum, and the spacing between the holes and the seeds can be further adjusted, that is, the slower the rotation speed, the larger the spacing between the holes and the seeds, and the faster the rotation speed, the smaller the spacing between the holes and the seeds, thereby achieving the adjustment of the sowing spacing according to the actual situation, greatly improving the applicability of the present invention.

[0014] In addition, the hole opening depth in the present invention is automatically controlled by the linkage of a limit plate and a travel switch, so that the cone head used for hole opening is driven downward by the telescopic drive member, and after being inserted to a specific distance from the surface of the soil layer, the cone head is driven to rise by the telescopic drive member, thereby enabling the mechanism of the present invention to ignore the difference in terrain flatness and open holes with consistent depth, thereby facilitating the germination and growth of seeds after sowing, and facilitating the planting rate and harvest of crops. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a field-returning seeder of the present invention; Figure 2 It is a three-dimensional structural schematic diagram of a sowing device part of the present invention; Figure 3 for Figure 2 Schematic diagram of the main structure; Figure 4 for Figure 2 A schematic diagram of the structure of a group of hole opening mechanisms and seed dropping mechanisms along the rotating drum; Figure 5 for Figure 4 A schematic diagram of a longitudinal cross-sectional structure; Figure 6 for Figure 4 A schematic cross-sectional view of the hole-opening mechanism and the seed-dropping mechanism; Figure 7 for Figure 6 A schematic diagram of a partially enlarged structure of the hole-opening mechanism; Figure 8 for Figure 6 A schematic diagram of a partially enlarged structure of the seed placement mechanism; Fig. 9 for Figure 2 A schematic diagram of the local enlarged structure of part D in FIG. Fig.10 for Fig. 9 A schematic diagram of the state in which the end cover is opened as the rotating cylinder rotates; Fig.11 and 121 is a schematic diagram of another embodiment in which the end cover closes the end of the rotating cylinder and the end cover is opened; markings in the figure: A, field returning device, B, machine body, C, sowing device, 1, mounting block, 2, rotating ring, 3, hole opening mechanism, 301, second rubber pad, 302, slide groove, 303, slip ring, 304, boss, 305, spring, 306, cone head, 307, telescopic shaft, 308, limit plate, 309, trigger part, 310, first rubber pad, 311 , limit ring, 312, telescopic drive member, 313, sleeve, 4, feed pipe, 5, seed dropping mechanism, 501, fixed cylinder, 502, pin shaft, 503, torsion spring, 504, end cover, 505, auger, 506, rotating cylinder, 507, gear ring, 508, gear, 509, motor, 510, fixed rod, 511, stop rod, 6, rotating cylinder, 601, middle hole, 7, rotating drive member, 8, seeding tube, 801, leakage hole, 9, stop head. DETAILED DESCRIPTION

[0016] like Figure 1 As shown, a field-returning seeder of the present invention is the same as the conventional field-returning seeder in the prior art in that it includes a machine body B, a field-returning device A arranged on the front side of the machine body B, and a sowing device C arranged on the rear side of the machine body B. In the process of the machine body B moving from right to left, the field-returning device A crushes the straw and then scatters it back into the field, and the sowing device C sows the seeds simultaneously. Unlike the conventional field-returning seeder, the sowing device C in the present invention is equipped with a punching mechanism, so that the present invention can synchronously and alternately complete the punching and sowing operations, thereby greatly improving the field-returning sowing efficiency of the present application. Since the above-mentioned field-returning device A and machine body B are conventional technical means in the field, only the sowing device C will be described below.

[0017] like Figure 2-4 As shown, a sowing device C of the present invention mainly comprises a rotating drum 6 and five rotating rings 2 which are fixed at intervals on the outer periphery of the rotating drum 6 along the axial direction of the rotating drum 6 and rotate synchronously with the rotating drum 6. Two hole-opening mechanisms 3 and two material-dropping mechanisms are arranged on any rotating ring 2, and the two hole-opening mechanisms 3 and the two material-dropping mechanisms are evenly spaced and staggered along the circumference of the rotating drum 6, and the hole-opening and sowing operations are performed in sequence during the rotation of the rotating drum 6 and the rotating rings 2.

[0018] The two ends of the rotating drum 6 are respectively rotatably mounted on the mounting blocks 1 fixed on the machine body B, and a lifting drive member (not shown in the figure) is provided on the machine body B to drive the two mounting blocks 1 to rise and fall synchronously, so as to adjust the distance between the rotating drum 6 and the surface of the soil layer. The right mounting block 1 is provided with a rotating drive member 7, and the rotating drum 6 and all the rotating rings 2 thereon are driven to rotate synchronously through the rotating drive member 7. Figure 4As shown, the rotating drum 6 is provided with a concentrically distributed seed tube 8, the outer edge of the seed tube 8 is arranged in close contact with the inner edge of the rotating drum 6, and the two ends of the seed tube 8 are respectively fixed to the mounting blocks 1 at the corresponding side positions, so that the seed tube 8 does not rotate with the rotating drum 6. The right end of the seed tube 8 extends through the corresponding mounting block 1 and is connected to a feed tube 4, which is connected to a silo (not shown) for storing seeds arranged on the machine body B, so that the seeds can enter the seed tube 8 through the feed tube 4 under the action of gravity or the driving action of the feeder.

[0019] Combination Figure 5-7 As shown, the hole-opening mechanism 3 mainly includes a sleeve 313 and a telescopic shaft 307 slidably arranged in the sleeve 313 in the longitudinal direction. One end of the sleeve 313 is fixedly connected to the rotating cylinder 6, and the other end is passed through the rotating ring 2 and is openly arranged. A cylinder is provided as a telescopic driving member 312 in the sleeve 313 near the rotating cylinder 6, and the telescopic end of the cylinder is directly fixedly connected to the inner end of the telescopic shaft 307, so that the telescopic shaft 307 is driven to move by the cylinder. A limiting ring 311 is fixedly provided on the outer periphery of the inner end of the telescopic shaft 307, and the limiting ring 311 contacts and slides with the inner wall of the sleeve 313 to maintain the posture of the telescopic shaft 307 through the limiting ring 311, so that it can keep moving coaxially with the sleeve 313. The outer end of the telescopic shaft 307 is located outside the sleeve 313, and a limiting plate 308 and a cone head 306 are provided on the telescopic shaft 307 in sequence from the inside to the outside.

[0020] The cone head 306 is fixedly connected to the outer end of the telescopic shaft 307, and is used to be inserted into the soil layer to make a hole when the telescopic shaft 307 moves downward under the action of the telescopic drive member 312, and the size of the cone head 306 ensures that the size of the hole opened is large enough to allow seeds to fall into it stably. The limit plate 308 is slidably sleeved on the telescopic shaft 307, and a step for supporting the lower edge of the limit plate 308 is provided at a position close to the outer end of the telescopic shaft 307. A spring 305 is provided on the upper edge of the limit plate 308, one end of the spring 305 abuts on the limit plate 308, and the other end abuts on the boss 304 provided in the middle of the telescopic shaft 307, so that the limit plate 308 is pressed against the step through the spring 305. The limit plate 308 is also concentrically provided with a triggering portion 309 in a cylindrical shape and extending into the telescopic shaft 307. Correspondingly, a slip ring 303 is slidably provided above the triggering portion 309 on the telescopic shaft 307. A slider is provided on the inner wall of the slip ring 303. The slider cooperates with the slide groove 302 provided on the telescopic shaft 307, so that the triggering portion 309 can touch the slip ring 303 and move upward along the slide groove 302 during the upward movement of the limit plate 308. The upper and lower ends of the slide groove 302 are both closed, and a travel switch (not shown in the figure) is provided on the telescopic shaft 307 at the end of the travel of the slip ring 303 moving upward. After the slip ring 303 continues to move upward until the upper edge of the slip ring 303 touches the travel switch, the travel switch controls the telescopic drive member 312 to stop continuously extending and turn to retracting.

[0021] Through the above structure, Figure 5 When a hole-opening mechanism 3 is shown rotating to a vertical downward state with the rotating drum 6 and the rotating ring 2, it is ready to open a hole. At this time, the telescopic end of the telescopic driving member 312 extends to drive the telescopic shaft 307 to move downward, so that the cone head 306 is inserted into the soil layer to open a hole. During the downward movement of the telescopic shaft 307, the limit plate 308 moves downward synchronously due to the thrust of the spring 305. After the lower edge of the limit plate 308 contacts the surface of the soil layer, the limit plate 308 cannot enter the soil layer due to its large outer diameter. The soil layer then generates an upward thrust on the limit plate 308, causing the limit plate 308 to move upward relative to the telescopic shaft 307. During the above-mentioned upward movement of the limit plate 308, the trigger part 309 thereon also moves upward synchronously until it contacts the lower edge of the slip ring 303 and pushes the slip ring 303 to move up to the upper end of the slide groove 302 to touch the travel switch. The travel switch immediately stops the telescopic driving member 312, and then pulls the telescopic shaft 307 upward to reset, thus completing the hole-making operation on the soil layer.

[0022] In the above-mentioned hole-opening process, since the rising stroke of the limit plate 308 after contacting the soil layer is fixed, the total depth of the cone head 306 inserted into the soil layer (i.e., the hole-opening depth) is also always consistent, so that the hole-opening mechanism 3 of the present invention can ignore the height difference of the soil layer surface caused by the field-returning device A or its own unevenness, and always maintain the consistency of the hole-opening depth, thereby facilitating the germination and growth of seeds after sowing. In this embodiment, a first rubber pad 310 is fixedly provided on the upper edge of the top contact part to contact the lower edge of the slip ring 303, and a second rubber pad 301 is fixedly provided on the telescopic shaft 307 to contact the upper edge of the slip ring 303, so as to avoid hard collisions between components and extend the service life of each component.

[0023] Combination Figure 5 , 6As shown in FIG. 8 , the seed dropping mechanism 5 mainly includes a seed dropping cylinder composed of a fixed cylinder 501 and a rotating cylinder 506. The inner end of the fixed cylinder 501 is fixed on the rotating cylinder 6, and a middle hole 601 is provided on the rotating cylinder 6 at a position corresponding to the fixed cylinder 501. After the seed dropping mechanism 5 rotates vertically downward along with the rotating cylinder 6 and the rotating ring 2, the middle hole 601 allows the seeds in the seed tube 8 to fall into the seed dropping cylinder in sequence through the leakage hole 801 provided at the lower edge of the seed tube 8 and the middle hole 601 under the action of gravity. The inner end of the rotating cylinder 506 rotates with the outer end of the fixed cylinder 501, and the outer end of the rotating cylinder 506 rotates with the rotating ring 2 and extends from the outer surface of the rotating ring 2. A motor 509 is provided on the fixed cylinder 501, and a gear 508 is provided at the output end of the motor 509. A gear ring 507 meshing with the gear 508 is provided on the outer periphery of the inner end of the rotating cylinder 506, that is, the rotating cylinder 6 is driven to rotate by the motor 509. An auger 505 is provided in the rotating cylinder 506, and the inner end of the auger 505 is fixed to the inner wall of the fixed cylinder 501 through a fixing rod 510, so that the rotating cylinder 6 rotates relative to the stationary auger 505 during rotation, thereby discharging the seeds in the seed dropping cylinder downward through the outer end opening of the rotating cylinder 506 to the hole opened by the hole opening mechanism 3.

[0024] In order to prevent the seeds from leaking randomly, an end cap 504 is provided at the outer end opening of the rotating cylinder 506. The outer edge of the end cap 504 is rotatably connected to the outer end of the rotating cylinder 506 through a pin 502, and a torsion spring 503 is sleeved on the pin 502 to keep the end cap 504 closing the opening of the rotating cylinder 506. In order to realize the automatic opening and closing of the end cap 504, as shown in FIG. Fig. 9 As shown, a stopper 511 is provided on the end cover 504, and a stopper 9 is provided at a corresponding position on the rotating ring 2. Fig. 9 In the non-discharging state shown, the blocking rod 511 and the end cover 504 are prevented from continuing to rotate under the torsion of the torsion spring 503 to block the rotating drum 506. In the discharging process, as the rotating drum 506 rotates, on the one hand, the auger 505 pushes the seeds to be discharged, and on the other hand, because the blocking head 9 is stationary with the rotating ring 2, the blocking rod 511 and the end cover 504 are prevented from continuing to rotate with the rotating drum 506, so that the blocking rod 511 and the end cover remain stationary with the blocking rod 9, and then the rotating drum 506 and the end cover 504 produce relative rotation and staggered displacement, and as shown in FIG. Fig.10 As shown, the outer end opening of the end of the rotating cylinder 506 is opened to allow the seeds to be discharged smoothly. In another embodiment of the present invention, as Fig.11 and 12 As shown, the stoppers 9 are distributed at intervals on the rotating cylinder 506. During the rotation of the rotating cylinder 506, the stoppers 9 always slide in cooperation with the stopper rod 511, which further reduces the rotation resistance and helps to extend the service life.

[0025] The gear lever 511 contacts the stopper 9 at the initial position. The rotating cylinder 506 rotates one circle to realize the opening and closing of the end cover 504, that is, to realize the discharging of the rotating cylinder 506. In this way, when the fixed cylinder 501 and the rotating cylinder 506 rotate to a state that is almost vertically downward, the gear 508 is driven by the 509 motor to drive the rotating cylinder 506 to discharging and sowing, and then it returns to the reverse position. The discharging amount of sowing can also be changed by the interval and the speed. The control and adjustment of the sowing can also be changed, and whether the sleeve 313 and the rotating cylinder 506 are in the vertical downward state can be detected by setting a sensor, or judged according to the speed of the rotating cylinder 6, and then directly controlling the working state of the telescopic drive member 312 and the motor 509. Similarly, specific control and adjustment can also be used to ensure that stable pit opening and sowing can be achieved at different heights.

[0026] Working principle: When working, the driver drives the locomotive at a constant speed on the field. During the driving process, the field returning device A first cuts the remaining straw and throws it back to the land, and at the same time crushes the roots of the straw to improve the field returning effect. Then the sowing device C starts to work by adjusting the driving mounting block 1 to a suitable height.

[0027] The rotating drive member 7 is started to drive the rotating drum 6 to rotate. When the rotating drum 6 rotates, it drives the sleeve 313, the rotating ring 2 and the fixed cylinder 501 to rotate synchronously. When the sleeve 313 rotates to the lower position, that is, it is in a vertical state, the telescopic drive member 312 is quickly pressurized and extended to drive the telescopic shaft 307 to move outward. The telescopic shaft 307 moves downward and drives the cone head 306 to be inserted downward into the field. When the insertion depth is sufficient, the limit plate 308 is pressed by the ground, thereby driving its top to slide into the sleeve 313. At this time, the top of the first rubber pad 310 hits the slip ring 303, and then the slip ring 303 is pushed to the top of the slide groove 302, and the travel switch is touched, so that the telescopic drive member 312 stops pressurizing, and immediately reverses to drive the telescopic shaft 307 and the cone head 306 to retract upward, so that quick digging in a short time is completed, and at the same time, seed pits of the same depth can be dug according to the ground at different heights.

[0028] After digging the hole, as the rotating drum 6 rotates, it drives the fixed drum 501 and the rotating drum 506 to rotate to the lower position. At this time, the motor 509 drives the gear 508 to rotate, and drives the rotating drum 506 to rotate through the meshing transmission. When the rotating drum 506 rotates, the stopper 9 will resist the stopper 511, so that the end cover 504 is opened from the opening of the rotating drum 506, and because the auger 505 and the rotating drum 506 are in a state of relative rotation, the seeds in the fixed drum 501 and the rotating drum 506 will fall from the outlet of the rotating drum 506 and fall into the previously dug seed pit, and the seeds will fall into the seed pit. The seeds in the seed tube 8 can also be replenished into the fixed cylinder 501 through the leakage hole 801. Later, when the fixed cylinder 501 and the rotating cylinder 506 rotate away from the bottom, the motor 509 drives the gear 508 to rotate in the opposite direction, thereby driving the rotating cylinder 506 to reverse. With the cooperation of the torsion spring 503, the stopper 9 and the stopper rod 511 cover the end cover 504 on the outlet end of the rotating cylinder 506. The above-mentioned pit digging and sowing steps can be carried out in sequence. In this way, stable pit digging and sowing can be guaranteed when the locomotive is traveling at a constant speed. At the same time, after sowing, the seed pit is filled with a plow to complete the entire sowing process.

[0029] During the above-mentioned hole-opening process, the entire device is in a uniform motion state, which can ensure that the seeds fall stably into the pit, and the cone head 306 has a certain size, and the pit hole opened is much larger than the seed. Under the premise that the seed is not required to fall exactly in the center of the pit hole, the seed can easily fall into the pit hole or close to the pit hole.

Claims

1. A sowing device, characterized in that: The invention comprises a seeding tube (8), a rotating drum (6) concentrically sleeved on the outer circumference of the seeding tube (8), and a rotating driving member (7) for driving the rotating drum (6) to rotate, wherein the rotating drum (6) is provided with staggered opening mechanisms (3) and seed dropping mechanisms (5) at intervals in the circumferential direction; The seed dropping mechanism (5) comprises a seed dropping cylinder fixed on a rotating cylinder (6); an end of the seed dropping cylinder away from the rotating cylinder (6) is provided with an openable end cover (504); a material leakage hole (801) is provided at the lower edge of the seeding tube (8); and a middle hole (601) is provided on the rotating cylinder (6) for connecting the material leakage hole (801) and the seed dropping cylinder after the seed dropping cylinder rotates to the material leakage hole (801); The hole-opening mechanism (3) comprises a sleeve (313) fixed on a rotating cylinder (6) and a telescopic shaft (307) slidably arranged in the sleeve (313) in a longitudinal direction, a telescopic driving member (312) for driving the telescopic shaft (307) to telescope is arranged in the sleeve (313), a limiting plate (308) and a cone head (306) are arranged in sequence on the portion of the telescopic shaft (307) located outside the sleeve (313), and the cone head (306) is fixed on the end of the telescopic shaft (307) and is used to move the telescopic driving member (312) during the telescopic operation. The telescopic drive member (312) is driven to be inserted into the ground to drill a hole, the limit plate (308) is slidably matched with the telescopic shaft (307), and the limit plate (308) is provided with a trigger part (309). The trigger part (309) can synchronously slide along the telescopic shaft (307) with the limit plate (308) and rise to a specific height, and then contact a travel switch arranged in the sleeve (313), so as to control the telescopic drive member (312) through the travel switch to drive the telescopic shaft (307) and the cone head (306) to rise.

2. A sowing device according to claim 1, characterized in that: A spring (305) is sleeved on the telescopic shaft (307), one end of the spring (305) abuts against the limiting plate (308), and the other end abuts against a boss (304) arranged on the telescopic shaft (307).

3. A sowing device according to claim 1, characterized in that: A slip ring (303) is slidably mounted on the telescopic shaft (307), a slider is provided on the inner wall of the slip ring (303), a slide groove (302) is provided on the telescopic shaft (307) and is distributed along its longitudinal direction and is slidably matched with the slider, both ends of the slide groove (302) are closed, the lower edge of the slip ring (303) is provided for the trigger part (309) to contact, and the upper edge of the slip ring (303) is used to contact the travel switch.

4. A sowing device according to claim 3, characterized in that: A first rubber pad (310) is provided on the upper edge of the trigger portion (309), and a second rubber pad (301) is provided on the telescopic shaft (307) at the end of the travel of the sliding ring (303) sliding along the sliding groove (302).

5. A sowing device according to claim 1, characterized in that: The seed dropping cylinder comprises a fixed cylinder (501) fixed on a rotating cylinder (6), a rotating cylinder (506) rotatably arranged at the end of the fixed cylinder (501), and a motor (509) for driving the rotating cylinder (506) to rotate, a gear (508) being arranged on the output shaft of the motor (509), the gear (508) being meshed with a gear ring (507) arranged on the outer periphery of the rotating cylinder (506), and an auger (505) being further arranged in the rotating cylinder (506); A rotating ring (2) fixed to the rotating cylinder (6) is also concentrically provided on the outer periphery of the rotating cylinder (6); the end of the rotating cylinder (506) away from the fixed cylinder (501) penetrates through the thickness direction of the rotating ring (2) and rotates in cooperation with the rotating ring (2); the end cover (504) is eccentrically hinged to the end of the rotating cylinder (506) and is provided with a torsion spring (503) at the hinge for enabling the end cover (504) to block the rotating cylinder (506); a stopper (9) is provided on the end cover (504), and a stopper rod (511) corresponding to the stopper (9) is provided on the rotating ring (2).

6. A seeding machine for returning soil to the field, comprising a machine body (B), a returning soil device (A) being arranged on the front side of the machine body (B), characterized in that: A sowing device (C) as described in any one of claims 1 to 5 is provided on the rear side of the machine body (B).

7. A field-returning seeder as claimed in claim 6, characterized in that: A mounting block (1) for cooperating with the seed tube (8) and a lifting drive member for adjusting the lifting of the mounting block (1) are provided at the bottom of the rear side of the machine body (B).

8. The field-returning seeder according to claim 6, characterized in that: One end of the seed pipe (8) extends out from the mounting block (1) and is connected to a feed pipe (4), and the feed pipe (4) is connected to a silo arranged on the machine body (B).

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