Novel double-row seeding unit

Abstract

A novel double-row seeding unit relates to the technical field of seeding of agricultural machinery, provides structural improvement aiming at the problem that the row spacing adjustment mode of an existing double-row seeding machine is tedious, realizes a linkage function of double-row seeding by replacing a swing shaft with two hydraulic cylinders which are communicated with each other, and simultaneously solves the problem of complex adjustment. The double-row seeder is mainly applied to double-row seeding of crops.

Description

Technical Field

[0001] This invention pertains to agricultural seeding machinery, specifically relating to a novel double-row seeding unit. Background Technology

[0002] Existing patent CN223943208U discloses a one-piece seeding unit, which requires simultaneous adjustment of the upper double connecting rods and the lower connecting shaft when adjusting the row spacing. Moreover, the front ends of the upper double connecting rods need to be adjusted separately, and the end of the lower connecting shaft adopts a gold ingot-shaped structure, which is inconvenient to disassemble and adjust. Furthermore, the adjustments of the upper and lower parts need to be carried out simultaneously, which is mutually interfering and cumbersome. This invention proposes an improvement to address this problem and enhance the practicality of the machine. Summary of the Invention

[0003] In order to overcome the shortcomings of the existing technology, the present invention provides an adjustable double-row seeder to solve the aforementioned technical problems.

[0004] The technical solution adopted by the present invention to solve its technical problem is to overcome the shortcomings of the prior art by disclosing a novel double-row seeding unit to solve the aforementioned problem.

[0005] The technical solution adopted by the present invention to solve the aforementioned problems is: a novel double-row sowing unit, comprising a four-link, a front half of the sowing unit, a left rear half of the sowing unit, a right rear half of the sowing unit, a left double link, a right double link, a left hydraulic cylinder, a right hydraulic cylinder, an oil pipe, a swing shaft, a furrowing disc, a depth limiting wheel, and a pressing wheel. The present invention adopts a new structure to replace the complex adjustment mechanism. Specifically, to address the issue that the front end of the upper double link needs to be adjusted separately, an adjustment beam, a column, and a U-shaped screw are added. First, the front end of the double link is hinged to the double link shaft fixed on the column through a tapered roller bearing. The column is detachably fixed on the adjustment beam of the front half of the sowing unit through the U-shaped screw. When adjusting, the nut of the U-shaped screw is loosened, and the column can move left and right along the adjustment beam, while simultaneously driving the rear half of the sowing unit connected to it to move together to complete the row spacing adjustment. To address the inconvenience of disassembling and adjusting the connecting shaft below, this invention modifies the end of the connecting shaft into a cylindrical structure with a pin hole at the end. A movable flat washer replaces the ingot-shaped end, and a B-shaped pin is used to block the flat washer to prevent it from falling off during operation. When adjusting the row spacing, there are two situations. One is to widen the row spacing. In this case, the two rear halves of the sowing unit need to be moved outwards, away from the swing shaft. First, remove the B-pin, remove the flat washer, loosen the nut of the U-screw, and move the rear half of the sowing unit to the set row spacing position. When the rear half of the sowing unit moves outwards, it will drive the connecting shaft to smoothly disengage from the long hole at the end of the swing shaft. After the row spacing is adjusted, tighten the nut of the U-screw to fix the rear half of the sowing unit in place during operation. Then loosen the single nut and rotate the connecting shaft to move it inwards (towards the swing shaft) so that it reconnects with the swing shaft shaft hole. Install the flat washer, insert the B-pin back in, and tighten the single nut to fix the connecting shaft in place during operation. Another adjustment involves narrowing the row spacing. This requires moving the two rear halves of the sowing unit inwards towards the swing shaft. First, remove the B-pin, remove the flat washer, loosen the single nut, and rotate the connecting shaft to move it outwards. Since the exact outward distance is difficult to determine, it's advisable to remove the connecting shaft altogether. After the row spacing of the sowing unit is adjusted, reinstall the connecting shaft, restoring its hinged connection with the long hole of the swing shaft. Install the flat washer, insert the B-pin again, and tighten the single nut to secure the connecting shaft during operation. This new structure greatly simplifies the row spacing adjustment method and makes it more convenient to use. To simplify row spacing adjustment and enhance ease of use, this invention introduces a novel double-row sowing unit structure. It eliminates the sway shaft, connecting shaft, and central shaft of the original structure, replacing them with two interconnected hydraulic cylinders. These two cylinders work in conjunction with the left and right rear halves, effectively replacing the sway shaft and further simplifying the double-row sowing unit structure. Adjusting the row spacing now requires only loosening the U-shaped screw nut, eliminating any complex procedures. Its working principle is as follows: Figure 11 The system includes the front half, left rear half, and right rear half of the sowing unit, a left double connecting rod, a right double connecting rod, a left hydraulic cylinder, and a right hydraulic cylinder. Taking the left side as an example, the sowing unit has a symmetrical structure, with the two halves being identical. A left hydraulic cylinder is installed at the pivot point connecting the front and rear halves of the left double connecting rod. The upper end of the piston rod of the left hydraulic cylinder is hinged to an upper support fixed to the upper end of the left column via a pin and a hole. The lower end of the left hydraulic cylinder is hinged to a lower support fixed to the front of the left rear half of the sowing unit via a pin and a hole. The installation method and position of the right hydraulic cylinder are the same as the left side. In its static installation, the left and right double connecting rods are basically parallel to each other. When the two rear halves of the sowing unit are placed on a flat ground at equal heights and the double connecting rods are horizontal to the horizon, the piston rods of the left and right hydraulic cylinders extend to half their full length (half a stroke). This ensures that the hydraulic cylinders do not affect the vertical movement of the double connecting rods, and the vertical movement of the double connecting rods is greater than the horizontal movement of the piston rods. Working principle: Assuming the left rear half of the seeding unit rises relative to the front half of the seeding unit, see [link / reference]. Figure 11This will cause the piston rod of the left hydraulic cylinder to be pressed back, and its oil pipe will connect with the right hydraulic cylinder. Hydraulic oil will flow into the right hydraulic cylinder, pushing the piston rod of the right hydraulic cylinder to extend. The extension of the piston rod of the right hydraulic cylinder will cause the right rear half of the sowing unit connected to it to descend relative to the front half of the sowing unit, and vice versa. The working principle is to achieve linkage between the left and right rear halves of the sowing unit by connecting the hydraulic cylinders with oil pipes. The length of the row spacing that needs to be adjusted is reserved in advance to make the adjustment of the row spacing simpler. Just loosen the nut of the U-shaped screw to adjust the row spacing at will, and tighten the nut of the U-shaped screw after adjustment.

[0006] The beneficial effects of this invention are that by using two interconnected hydraulic cylinders instead of a rocker shaft to achieve linkage between the two rear halves of the sowing unit, double-row sowing can achieve independent contouring, strong adaptability to ridge deviation, and make the row spacing adjustment of the integrated sowing unit simpler, thereby enhancing the practicality of the machinery and solving the tedious adjustment problem that plagues farmers. Attached Figure Description

[0007] Figure 1 This is the left view of the swing-axis double-row seeding unit; Figure 2 This is the right view of a swing-axis double-row seeding unit; Figure 3 This is a top view of a swing-axis double-row seeding unit; the four-bar linkage is at the top, and drawing it would block the view below, so it is drawn in front, as it is an existing device. Figure 4 This is a top view of the swing-axis double-row sowing unit after width adjustment; Figure 5 It is a connecting shaft that hinges the rear half of the left and right sowing units to both ends of the swing shaft, and its end has a pin hole for installing B-shaped pins; Figure 6 This is a schematic diagram of the connection between the connecting shaft and the rocker shaft; during adjustment, remove the B-pin and the flat washer, and the connecting shaft can be directly removed from the long hole of the rocker shaft; Figure 7 This is a left view of a hydraulic cylinder-linked double-row seeding row; Figure 8 This is a right view of a hydraulic cylinder-linked double-row seeding unit; Figure 9 This is a top view of a hydraulic cylinder-linked double-row seeding unit; Figure 10 This is a top view of the hydraulic cylinder-linked double-row seeding unit after width adjustment; Figure 11 This is a schematic diagram showing the connection between the left and right hydraulic cylinders and the oil pipes; The oil pipe connects the left and right oil cylinders and has reserved adjustment length to adjust the row spacing of the sowing unit. When it is working normally, the ball valve is closed and the pistons of the left and right hydraulic cylinders are extended to half the stroke. In this way, the oil pipe connects the left and right hydraulic cylinders. If one of the pistons retracts due to force, it compresses the hydraulic oil in the hydraulic cylinder. The hydraulic oil will flow through the oil pipe to the other hydraulic cylinder, causing the piston of the other hydraulic cylinder to extend, and vice versa. Figure 12 This is a cross-sectional view of the adjustment beam installed at the rear of the front half of the double-row sowing unit of the present invention. The rear adjustment beam is welded to the reinforcing iron plate. The left and right ends of the reinforcing iron plate are welded to the two side uprights of the front half. Adjustment windows are left at the upper and lower positions of the reinforcing iron plate. U-shaped screws are fitted on the rear adjustment beam and can move along the rear adjustment beam to adjust the row spacing. Figure 13 It is a cross-sectional view of a double connecting rod, in which the double connecting rod is hinged to the double connecting rod shaft using tapered roller bearings. This allows adjustment of the working clearance between the double connecting rod and the double connecting rod shaft, so that it can pivot relative to each other without wobbling, and the front and rear halves can pivot downwards without wobbling left and right to maintain accurate row spacing. Figure 14 This is the left view when the rear halves of the two seeding units are parallel; Figure 15 This is a top view of the redesigned front half of the adjustment beam with a shortened front-to-back distance. The four-link structure is drawn at the front to indicate its lateral position relative to the front half of the seeding unit; Figure 16 The front half of the redesigned seeding unit is shown, with the rear half of both seeding units connected to the front adjustment beam. The top view shows the rear half of the two seeding units arranged in parallel. The four-link is connected to the front half of the seeding unit, and its position on the column would cause confusion in the drawings, so it is drawn first to show that its structural position is a left-right symmetrical installation relationship. Figure 17 This describes the scenario where the piston rod of the left hydraulic cylinder shortens and the piston rod of the right hydraulic cylinder extends when the two rear halves of the sowing unit are linked relative to the front half of the sowing unit. The dashed lines represent structures that are not visible. Parts shown in the diagram: 1. Seeder crossbeam; 2. Four-bar linkage assembly; 3. Front adjusting beam; 4. Front half of the seeding unit; 5. Rear left half of the seeding unit; 6. Rear right half of the seeding unit; 7. Right double connecting rod; 8. Left double connecting rod; 9. Left hydraulic cylinder; 10. Right hydraulic cylinder; 11. Upper support seat; 12. 13. Lower support seat, 14. Reinforcing iron plate, 15. U-bolt, 16. Rear adjusting beam, 17. Column, 18. Adjusting window, 19. Oil pipe, 20. Ball valve, 21. T-joint, 22. Double connecting rod shaft, 23. Tapered roller bearing, 24. Double nut, 25. Grooving disc, 26. Depth limiting wheel, 27. Single press wheel assembly, 28. Double press wheel assembly, 29. Pin, 30. Support arm shaft, 31. Support arm, 32. Single nut, 33. B-shaped pin, 34. Connecting shaft, 35. Flat washer, 36. Swing shaft, 37. Center shaft, 38. Depth wrench, 39. Pressure wrench, 40. Nut, 41. Long hole, 42. Side upright plate; The present invention will be further described below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0008] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be noted that the preferred embodiments described herein are only for better explanation of the present invention and are not intended to limit the present invention. The specific implementation of the present invention is as follows: Example 1, as... Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the new double-row sowing unit consists of a front half 4, a left rear half 5, and a right rear half 6. Seed metering devices (not shown) are installed above the left and right rear halves of the sowing unit. Furrowing discs 24 and depth-limiting wheels 25 are installed below the left and right rear halves of the sowing unit, respectively. The depth-limiting wheels 25 are hinged to a support shaft 29 fixed to the side of the rear half of the sowing unit via support arms 30. A depth wrench 37 is used to adjust the furrowing depth of the sowing unit. A press wheel assembly is installed at the rear of each of the left and right rear halves of the sowing unit; a single press wheel assembly 26 and a double press wheel assembly 27 are available. Each press wheel assembly is equipped with a pressure handle 38. Adjusting the pressure; the front half 4 of the sowing unit is pivotally connected to the seeder crossbeam 1 via a four-bar linkage assembly 2. A front adjusting beam 3 is provided in front of the front half of the sowing unit. The right rear half 6 of the sowing unit is pivotally connected to the front adjusting beam 3 via a right double connecting rod assembly 7. A rear adjusting beam 15 is provided behind the front half 4 of the sowing unit. The left rear half 5 of the sowing unit is pivotally connected to the rear adjusting beam 15 via a left double connecting rod assembly 8. A central shaft 36 is provided below the rear of the front half 4 of the sowing unit. A swing shaft 35 is hinged to the central shaft 36 through a shaft hole provided in its middle. Connecting shafts 33 are respectively provided in the lower front of the left and right rear halves of the sowing unit. Figure 5As shown, the connecting shaft 33 is a cylindrical structure with external threads, which mate with the internal threads in the connecting shaft hole of the rear half of the sowing unit. Its extension length can be adjusted. During operation, it is fixed by a single nut 31, and its end has a pin hole. The connecting shaft 33 of the left rear half 5 of the sowing unit is hinged to the elongated hole 40 at the rear end of the swing shaft 35. A flat washer 34 is installed at its end, and a type B pin prevents it from disengaging during operation. Figure 6 As shown, the connecting shaft 33 of the right rear half 6 of the sowing unit is hinged to the front end elongated hole 40 of the swing shaft 35. A flat washer 34 and a type B pin 32 are installed at the end of the connecting shaft 33 to prevent it from disengaging during operation; Figure 6 ,like Figure 5 As shown, the connecting shaft 33 is cylindrical and has an overall screw structure. It is adjustablely installed at the front of the rear half of the sowing unit, fitting the internal thread within the connecting shaft hole at the front of the rear half of the sowing unit. During operation, it is secured with a single nut 31. Figure 1 As shown, this embodiment is described primarily from the left side. The two rear halves of the sowing unit have a symmetrical structure with identical functions. A seed metering device is located above the left rear half 5 of the sowing unit, which is not shown in the prior art. A double-link shaft is located in front of the left rear half of the sowing unit. The left double-link 8 is hinged to the double-link shaft 21 via a tapered roller bearing 22. Figure 13 As shown, the clearance of the tapered roller bearing 22 is adjusted using double nuts 23 to ensure that the left double connecting rod and the double connecting rod shaft can pivot without wobbling. The clearance caused by wear during operation can be eliminated by adjusting the double nuts 23, ensuring that the left rear half 5 of the sowing unit does not sway laterally relative to the front half 4 of the sowing unit, thus maintaining accurate row spacing. The front end of the left double connecting rod 8 is hinged to the double connecting rod shaft 21 fixed on the column 16 via the tapered roller bearing 22. The column 16 is fixed to the rear adjusting beam 15 by U-bolts 14. The rear adjusting beam 15 is fixed to the side upright plate 41 behind the front half 4 of the sowing unit by reinforcing iron plate 13. The rear adjusting beam 15 has adjustment windows 17 in the vertical direction, and the U-bolts 14 can move along the windows. Figure 12As shown, the rear adjustment beam 15 is welded to the reinforcing iron plate 13, and the two ends of the reinforcing iron plate 13 are welded to the side upright plate 41 behind the front half 4 of the sowing unit. The sowing unit is installed such that when the two rear halves are placed on the ground and at the same height, the swing shaft is in a horizontal position. The double connecting rods on the right sides are parallel to the swing shaft and are also in a horizontal position. The function of the double connecting rods is to movably connect the front half and the rear half of the sowing unit and to ensure that the rear half of the sowing unit maintains a basically vertical movement while floating up and down. The function of the swing shaft is to make the two rear halves on the left and right sides move in a related motion when floating up and down. The so-called related motion can be understood as the two rear halves of the sowing unit moving in a related motion when sowing. The rear part of the unit moves in a seesaw motion with the front half of the sowing unit as the fulcrum, with one side rising and the other side falling. For example, when the left rear half 5 of the sowing unit rises relative to the front half 4 of the sowing unit, since its connecting shaft 33 is hinged to the long hole 40 at the rear end of the swing shaft 35, the rear end of the swing shaft 35 rises together. The center of the swing shaft 35 is hinged to the central axis 36 of the front half 4 of the sowing unit, so the center of the swing shaft 35 does not move. Therefore, the front end of the swing shaft 35 falls relative to the front half 4 of the sowing unit. The long hole 40 at the front end of the swing shaft 35 is hinged to the connecting shaft 33 of the right rear half 6 of the sowing unit, so the right rear half 6 of the sowing unit falls relative to the front half 4 of the sowing unit, and vice versa. There are two methods for adjusting row spacing. One is to widen the row spacing, which requires moving the two rear halves of the sowing unit outwards, such as... Figure 4 As shown, first remove the B-pin 32, remove the flat washer 34, loosen the nut 39 of the U-screw 14, and adjust the two rear halves of the sowing unit to move outward to the predetermined row spacing position. Simultaneously, this will cause the connecting shaft 33 to smoothly disengage from the elongated hole 40 at the end of the swing shaft 35. After the row spacing is adjusted, tighten the nut 39 of the U-screw 14 to prevent lateral swaying of the two rear halves of the sowing unit during operation. Then loosen the single nut 31, rotate the connecting shaft 33 to move it inward (towards the swing shaft 35), restoring its hinged connection with the swing shaft 35. Install the flat washer and insert the B-pin back in, as shown. Figure 6 As shown, tightening the single nut 31 fixes the connecting shaft 33 in place during operation. Another adjustment is to narrow the row spacing. This requires adjusting the two rear halves of the sowing unit to move inward toward the swing shaft. First, remove the B-pin 32, remove the flat washer 34, loosen the single nut 31, and rotate the connecting shaft 33 to move it outward. The direction opposite to the swing shaft 35 is the outward direction. Since the outward movement distance is difficult to control, you can simply remove the connecting shaft 33 for later use. Loosen the nut 39 of the U-shaped screw 14 to adjust the position of the rear half of the sowing unit. After the row spacing of the sowing unit is adjusted, reinstall the connecting shaft 33 and restore its hinge connection with the elongated hole 40 of the swing shaft 35. Then, install the flat washer 34, insert the B-pin 32 back in, and tighten the single nut 31. Figure 6As shown, this fixes the connecting shaft 33. Adjustable shims are located on the connecting shaft 33; the shims are removed when the line spacing narrows and added when the line spacing widens, preventing the rocker shaft 35 from swaying laterally. This new structure greatly simplifies line spacing adjustment and makes it more convenient to use. Example 2 includes a front half 4 of the sowing unit, a left rear half 5 of the sowing unit, a right rear half 6 of the sowing unit, a left double connecting rod 8, a right double connecting rod 7, a left hydraulic cylinder 9, a right hydraulic cylinder 10, an oil pipe 18, and a ball valve 19. The mechanical structure of this example is based on the mechanical structure of Example 1, but the rocker shaft 35, connecting shaft 33, and central shaft 36 are removed. The left hydraulic cylinder 9, right hydraulic cylinder 10, oil pipe 18, ball valve 19, and distributor (not shown) are newly added. The remaining structures are basically the same. Since the rocker shaft is removed, there is no limitation on distance (the rocker shaft cannot work properly if it is too short). Therefore, the distance between the left and right rear halves of the sowing unit in this example can be arbitrarily designed (not adjustable). Figure 15 , Figure 16 As shown, by redesigning the front half of the seeding unit and changing the front-to-back distance between the two adjusting beams, the staggered distance between the two rear halves of the seeding unit can be changed, and even the two rear halves of the seeding unit can work normally when parallel to each other. Figure 14 , Figure 16 As shown, the left and right rear halves of this sowing unit have the same structure and function. This embodiment focuses on the left side. A left hydraulic cylinder 9 is installed at the pivot point connecting the two halves of the left double connecting rod 8. The upper end of the piston rod of the left hydraulic cylinder 9 is hinged to the upper support seat 11 fixed to the upper end of the left column 16 via pin 28 and a hole. The lower end of the left hydraulic cylinder 9 is hinged to the lower support seat 12 fixed to the front of the left rear half 5 of the sowing unit via a hole and pin 28. The installation method and position of the right hydraulic cylinder 10 on the right rear half 6 of the sowing unit are the same as on the left. The left and right hydraulic cylinders are connected by oil pipe 18. The two hydraulic cylinders are double-acting, and the inside of the hydraulic cylinder is divided into two chambers with variable volumes, with the piston as the boundary. Figure 11As shown, the volume of the two chambers changes with the piston position. The upper chamber oil pipe connects to the two upper chambers of the left and right hydraulic cylinders, and the lower chamber oil pipe connects to the two lower chambers of the left and right hydraulic cylinders. The connecting oil pipes of the upper and lower chambers are respectively connected to the two oil supply pipes of the distributor (not shown) through the tee connector 20. Ball valves 19 are installed on the two oil supply pipes respectively. The static installation relationship is that the two rear halves of the sowing unit are at the same height. The two rear halves of the sowing unit are placed on the flat ground. The double connecting rods on the left and right sides are basically parallel to each other. When the double connecting rods are horizontal to the horizon, the piston rods of the left and right hydraulic cylinders extend half of their full length (half of the stroke). During the initial installation, the piston rods of the left and right hydraulic cylinders should be fully extended and retracted several times to vent the air. The vertical floating stroke of the double connecting rods is greater than the extension and retraction stroke of the hydraulic cylinders. When the piston rods of the left and right hydraulic cylinders extend half of their full length, the ball valves of the oil supply pipes are closed. In this way, multiple sowing units do not affect each other, and each sowing unit can be adjusted independently. Working principle: Assuming that the left rear half 5 of the sowing unit rises relative to the front half 4 of the sowing unit, see [reference]. Figure 11 , Figure 7 , Figure 8 As shown, the piston rod of the left hydraulic cylinder 9 is compressed back, and the oil pipe of the left hydraulic cylinder 9 is connected to the oil pipe of the right hydraulic cylinder 10. The hydraulic oil in the lower chamber of the left hydraulic cylinder 9 flows into the lower chamber of the right hydraulic cylinder 10, pushing the piston rod of the right hydraulic cylinder 10 to extend. The extension of the piston rod of the right hydraulic cylinder 10 will cause the volume of the upper chamber of the right hydraulic cylinder to decrease, which will compress the hydraulic oil in the upper chamber. At this time, the piston rod of the left hydraulic cylinder 9 shortens, and the volume of its upper chamber increases. The upper chambers of the left and right hydraulic cylinders are connected by oil pipes, so the hydraulic oil in the upper chamber of the right hydraulic cylinder 10 flows into the upper chamber of the left hydraulic cylinder 9 through the connecting oil pipes. The extension of the piston rod of the right hydraulic cylinder 10 directly causes the right rear half 6 of the seeding unit connected to it to descend relative to the front half 4 of the seeding unit, and vice versa. Figure 17 As shown, two interconnected hydraulic cylinders replace the rocker shaft to achieve the linkage function of the left and right rear halves. The linkage function can be understood as the left rear half 5 of the sowing unit and the right rear half 6 of the sowing unit moving in a seesaw motion with the front half 4 of the sowing unit as the fulcrum. One side rises while the other side falls, and vice versa. This enables the double row sowing unit to achieve contour-following furrow sowing, which is highly adaptable to the case of ridge deviation. It also greatly simplifies the row spacing adjustment. As long as the length of the connecting oil pipe that needs to be adjusted is reserved in advance, the row spacing adjustment is even simpler. Just loosen the nut 39 of the U-shaped screw 14 to adjust the row spacing at will. There is no entanglement between the rear halves of the two sowing units. After the adjustment is completed, tighten the nut 39 of the U-shaped screw 14. The two hydraulic cylinders on the left and right are double-acting and have identical structures, such as... Figure 11As shown, the piston rod of the hydraulic cylinder shortens when the upper chamber supplies oil and the lower chamber returns oil, and the piston rod of the hydraulic cylinder extends when the lower chamber supplies oil and the upper chamber returns oil. When the piston rods of the left and right hydraulic cylinders extend half of their full stroke, the ball valve is closed to prevent the distributor from depressurizing and affecting the normal operation of the hydraulic cylinders. The left and right hydraulic cylinders work together and are independent of the external hydraulic oil circuit.

[0009] The linkage function achieved through interconnected hydraulic cylinders can also be applied to the ground wheels of seeders.

Claims

1. A novel double-row seeding unit, comprising a front adjusting beam, a rear adjusting beam, a left column, a right column, a front half of the seeding unit, a left rear half of the seeding unit, a right rear half of the seeding unit, a left double connecting rod, a right double connecting rod, a central shaft, and a swing shaft, characterized in that: The front half of the sowing unit is provided with a front adjustment beam and a rear adjustment beam. The left column is detachably fixed to the rear adjustment beam, and the right column is detachably fixed to the front adjustment beam. The front end of the left double connecting rod is hinged to a double connecting rod shaft fixed on the left column, and the rear end of the left double connecting rod is hinged to a double connecting rod shaft fixed on the front end of the left rear half of the sowing unit. The front end of the right double connecting rod is hinged to a double connecting rod shaft fixed on the right column, and the rear end of the right double connecting rod is hinged to a double connecting rod shaft fixed on the front end of the right rear half of the sowing unit. The two ends of the swing shaft are respectively hinged to the two rear halves of the sowing unit. The swing shaft is hinged to the front half of the sowing unit through a central shaft.

2. The novel double-row seeding unit according to claim 1, characterized in that: The double connecting rod and the double connecting rod shaft are hinged by tapered roller bearings.

3. The novel double-row seeding unit according to claim 1 is characterized in that: The connecting shaft has a cylindrical structure.

4. A hydraulically linked double-row seeding unit, comprising a front half of the seeding unit, a left rear half of the seeding unit, a right rear half of the seeding unit, a left double connecting rod, a right double connecting rod, a left hydraulic cylinder, a right hydraulic cylinder, and oil pipes, characterized in that: The left double connecting rod is hinged between the front half of the seeding unit and the left rear half of the seeding unit, the right double connecting rod is hinged between the front half of the seeding unit and the right rear half of the seeding unit, the left hydraulic cylinder is hinged between the front half of the seeding unit and the left rear half of the seeding unit, the right hydraulic cylinder is hinged between the front half of the seeding unit and the right rear half of the seeding unit, and the oil pipe connects the left hydraulic cylinder and the right hydraulic cylinder.

5. A hydraulically linked double-row seeding unit according to claim 4, characterized in that: The two hydraulic cylinders on the left and right are double-acting.

6. A hydraulically linked double-row seeding unit according to claim 4, characterized in that: The oil pipe is equipped with a ball valve.

7. A hydraulically linked double-row seeding unit according to claim 4, characterized in that: The left rear half and the right rear half of the sowing unit are linked by two interconnected hydraulic cylinders.

8. A hydraulically linked double-row seeding unit according to claim 4, characterized in that: The two hydraulic cylinders on the left and right are double-acting and have identical structures.

9. A hydraulically linked double-row seeding unit according to claim 4, characterized in that: Two interconnected hydraulic cylinders replace the rocker shaft to achieve the linkage function of the left and right rear halves. The linkage function can be understood as the left rear half of the sowing unit and the right rear half of the sowing unit moving in a seesaw motion with the front half of the sowing unit as the fulcrum. One side rises while the other side falls, and vice versa. This enables the double-row sowing unit to achieve contour-following furrow sowing, which is highly adaptable to ridge deviation and greatly simplifies the row spacing adjustment. As long as the length of the connecting oil pipe that needs to be adjusted is reserved in advance, the row spacing adjustment is even simpler. Just loosen the nut of the U-shaped screw 14 and the row spacing can be adjusted at will. There is no interference between the rear halves of the two sowing units. After adjustment, tighten the nut of the U-shaped screw.

10. A hydraulically linked double-row seeding unit according to claim 4, characterized in that: The linkage function achieved through interconnected hydraulic cylinders can also be applied to the ground wheels of seeders.

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