Seeding depth adjusting device based on parallel connecting rod mechanism

Abstract

The utility model relates to a seeding depth adjusting device based on a parallel connecting rod mechanism, which is characterized in that a fixed seat and a lifting seat are arranged side by side at an interval, a ditching plowshare is arranged on a lower end plate of the lifting seat, and an upper connecting rod assembly is hinged between the upper end of the fixed seat and the upper end of the lifting seat; a lower connecting rod assembly is hinged between the lower end of the fixing base and the middle of the lifting base, the upper connecting rod assembly and the lower connecting rod assembly are arranged in parallel to form a parallelogram connecting rod structure, and an elastic traction mechanism is arranged between the upper connecting rod assembly and the fixing base. The parallelogram connecting rod mechanism in the adjusting device can rotate and deform downwards under the action of the tension spring to provide elastic downward pressing force for the ditching plowshare at the lower part of the lifting seat, so that an elastic downward pressing ditching plough structure is formed, and when encountering a hard soil layer or residual bricks and other sundries in a region in the seeding process, the ditching plowshare can be driven to rotate and deform. The ditching plowshare can rise upwards to avoid and stretch the tension spring when bearing large resistance, the phenomenon that teeth are broken and broken at the plowshare is effectively avoided, and the service life of the ditching plowshare is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of sowing equipment, in particular to a sowing depth regulating device based on a parallel link mechanism. Background Art

[0002] Sowing depth refers to the vertical distance between the seeds and the ground after the seeds are sown in the soil. This depth has an important impact on seed germination, emergence, growth, and the final crop yield and quality.

[0003] The texture, structure and moisture content of the soil will affect the sowing depth. In soil with poor moisture content, the sowing depth can be slightly deeper. Deeper sowing helps prevent seeds from being blown away by the wind or avoids sowing seeds in the dry soil on the surface. In heavy, compacted or soil with good moisture content, the sowing depth should be appropriately shallower to avoid difficulties in seed germination or obstructed root development. Therefore, seed drills usually need to be equipped with a sowing depth adjustment mechanism.

[0004] At present, the sowing depth adjustment structure of the seed drill is mostly to install the furrowing plow on the lifting leg, and set a corresponding support sleeve on the frame. The lifting leg is slidably sleeved in the support sleeve, and the height adjustment and locking are achieved by setting multiple pins and pin holes at equal intervals between the lifting leg and the support sleeve. The operation process of this adjustment mechanism is relatively cumbersome, and it provides rigid support for the furrowing plow. If the hard soil layer or residual bricks and other debris are encountered in the area during the sowing process, the furrowing plow cannot effectively avoid them, and the plow head is prone to tooth breakage and fracture. Utility Model Content

[0005] In order to solve the above problems, the utility model proposes a sowing depth adjustment device based on a parallel linkage mechanism.

[0006] The technical solution of the utility model is: a sowing depth adjustment device based on a parallel linkage mechanism, comprising a fixed seat and a lifting seat with a U-shaped cross-section, the length of the lifting seat is larger than the length of the fixed seat, the fixed seat and the lifting seat are arranged side by side and a spacing is provided between the two, a furrowing plow head is provided on the lower end plate of the lifting seat, the furrowing plow head faces the fixed seat, an upper connecting rod assembly is hinged between the upper end of the fixed seat and the upper end of the lifting seat, a lower connecting rod assembly is hinged between the lower end of the fixed seat and the middle part of the lifting seat, the length of the upper connecting rod assembly is the same as the length of the lower connecting rod assembly, the upper connecting rod assembly and the lower connecting rod assembly are arranged parallel to each other to form a parallelogram connecting rod structure, and an elastic pulling mechanism is provided between the upper connecting rod assembly and the fixed seat.

[0007] Preferably, the upper connecting rod assembly includes two upper rod bodies arranged side by side, the two upper rod bodies are arranged parallel to each other, the ends of the upper rod bodies are fixedly connected by sleeves, the sleeves are welded and fixed between the two upper rod bodies, and upper horizontal axes are provided between the side plates of the upper ends of the fixed seat and the lifting seat, and the two upper horizontal axes are rotatably sleeved in the two sleeves.

[0008] Preferably, the lower connecting rod assembly includes two lower rod bodies arranged side by side, the two lower rod bodies are arranged parallel to each other, the ends of the two lower rod bodies are fixedly connected as one through a supporting cross bar, the supporting cross bar is welded and fixed between the two lower rod bodies, and a lower cross bar is provided between the lower end of the fixed seat and the middle part of the lifting seat, and the end of the lower rod body is rotatably connected to the lower cross bar.

[0009] Preferably, the elastic pulling mechanism includes a tension spring and a square clip. The square clip is T-shaped as a whole. Both ends of the square clip are provided with a clamping boss. The surface of the upper rod body is provided with a plurality of inclined grooves at equal intervals. The clamping boss is matched and clamped in the inclined groove. The bottom surface of the clamping boss is set to an inclined surface that can cooperate with the bottom of the inclined groove, and a hanging hole is provided at the lower part of the square clip. The upper end of the tension spring is hung in the hanging hole, and the lower end is hung with the lower cross bar. The hanging circle at the lower end of the tension spring is larger than the hanging circle at the upper end.

[0010] Preferably, a square through hole is provided in the middle of the square card plate, and transition rounded corners are provided at the four corners of the square through hole.

[0011] Preferably, both ends of the lower portion of the square clamping plate are provided with hanging holes, and tension springs are connected to the two hanging holes. The tension springs are coil springs with larger damping force.

[0012] Preferably, extension plates are provided on both sides of the docking surface of the fixing seat, the extension plates on both sides are arranged parallel to each other, and a card slot is provided in the middle of the extension plate.

[0013] The beneficial technical effects of the utility model are:

[0014] (1) The parallelogram linkage mechanism in the adjustment device can be rotated and deformed downward under the action of the tension spring, providing elastic downward pressure for the furrowing plow head under the lifting seat, forming an elastic downward pressure furrowing plow structure. When encountering hard soil layers or residual bricks and other debris in the area during sowing, the furrowing plow head will rise upward to avoid and stretch the tension spring due to greater resistance, effectively avoiding the phenomenon of tooth breakage and fracture at the plow head, which is beneficial to improving its service life.

[0015] (2) The pulling mechanism adjusts the stretching length of the tension spring by inserting the square card into different inclined grooves, thereby changing the downward pressure exerted on the lifting seat and the furrowing plow head at the outer end of the connecting rod mechanism, thereby adjusting the furrowing and sowing depth. This adjustment method does not require the disassembly of parts and is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural diagram of the utility model in which the earth sealing wheel and other components are installed on the lifting seat;

[0017] Figure 2 It is a schematic diagram of the three-dimensional structure of the utility model;

[0018] Figure 3 yes Figure 2 AA-direction cross-sectional structural diagram;

[0019] Figure 4 yes Figure 3 BB-direction cross-sectional structural diagram;

[0020] Figure 5 This is a schematic diagram of the three-dimensional structure of the tension spring connected to the square card;

[0021] Figure 6 1. It is a schematic diagram of the three-dimensional structure of the upper connecting rod assembly;

[0022] Figure 7 It is a schematic diagram of the three-dimensional structure of the lower connecting rod assembly.

[0023] In the figure, 11. fixing seat, 111. slot, 12. lifting seat, 121. furrowing plow, 131. upper rod body, 132. sleeve, 133. upper horizontal axis, 141. lower rod body, 142. supporting cross bar, 143. lower cross bar, 151. tension spring, 152. square clamping plate, 153. clamping boss, 154. inclined groove, 155. square through hole, 156. hanging hole. DETAILED DESCRIPTION

[0024] Example 1, see attached Figure 1-3 , 6-7, a sowing depth adjustment device based on a parallel linkage mechanism, comprising a fixed seat 11 and a lifting seat 12 with a U-shaped cross-section, the fixed seat being fixedly connected to the frame of the seeder, the fixed seat and the lifting seat being arranged side by side with a certain distance between them, a furrowing plow head 121 being provided on the lower end plate of the lifting seat 12, the furrowing plow head rising or falling with the lifting seat 12, an upper connecting rod assembly being hinged between the upper end of the fixed seat 11 and the upper end of the lifting seat, a lower connecting rod assembly being hinged between the lower end of the fixed seat 11 and the middle part of the lifting seat 12, the upper connecting rod assembly and the lower connecting rod assembly being arranged parallel to each other to form a parallelogram linkage structure, the lifting seat 12 can rise or fall vertically at the free end of the parallelogram linkage structure, and an elastic pulling mechanism is provided between the upper connecting rod assembly and the fixed seat 11, through which a downward pulling force is provided to the parallelogram linkage structure, and a furrowing downward pressure is applied to the furrowing plow head 121 at the lower end of the lifting seat 12.

[0025] Extension plates are provided on both sides of the docking surface of the fixing seat 11 , and a slot 111 for engaging with the frame crossbeam is provided in the middle of the extension plate.

[0026] The upper connecting rod assembly includes two upper rod bodies 131 arranged side by side, and the ends of the upper rod bodies are fixedly connected by sleeves 132. Upper transverse shafts 133 are provided between the side plates of the upper ends of the fixed seat 11 and the lifting seat 12, and the two upper transverse shafts are rotatably sleeved in the two sleeves 132; the lower connecting rod assembly includes two lower rod bodies 141 arranged side by side, and the ends of the two lower rod bodies are fixedly connected as a whole by a supporting transverse bar 142. A lower transverse bar 143 is provided between the lower end of the fixed seat 11 and the middle part of the lifting seat 12, and the end of the lower rod body 141 is rotatably connected to the lower transverse bar 143; the upper connecting rod assembly and lower connecting rod assembly of this double rod body have a stable structure, and have good stability when installed between the fixed seat 11 and the lifting seat 12. They will not swing left and right when subjected to lateral force, providing stable trenching support force for the lower trenching plow head 121.

[0027] When the adjustment device of this embodiment is in use, the connecting rod mechanism composed of the upper connecting rod assembly and the lower connecting rod assembly will rotate and deform downward under the action of the tension spring 151, and the lifting seat 12 will be pressed vertically downward. An elastic downward pressure is generated at the furrowing plow head 121 at the lower part of the lifting seat 12, forming an elastic downward-pressing furrowing plow structure. When encountering a hard soil layer or residual bricks and other debris in the area during the furrowing and sowing process, the furrowing plow head 121 will be subject to greater resistance and will rise upward to avoid and stretch the tension spring 151, thereby avoiding tooth breakage and fracture at the plow head. After crossing the obstacle, the plow head will return to the set furrowing and sowing depth under the action of the tension of the tension spring 151 to carry out sowing operations.

[0028] Example 2, see attached Figure 3-5 The elastic pulling mechanism includes a tension spring 151 and a square clip 152. Both ends of the square clip are provided with engaging bosses 153. A plurality of equally spaced oblique grooves 154 are provided on the surface of the upper rod 131. The engaging bosses 153 fit into the oblique grooves 154. A hooking hole 156 is provided at the lower portion of the square clip 152. The upper end of the tension spring 151 fits into the hooking hole 156, and the lower end is engaged with the lower crossbar 143. The pulling mechanism adjusts the stretched length of the tension spring 151 by engaging the square clip 152 into different oblique grooves 154. This in turn changes the downward force exerted on the connecting rod mechanism composed of the upper rod 131 and the lower rod 141, thereby adjusting the height of the lifting seat 12 and the furrowing plowshare 121, and thereby adjusting the furrowing and sowing depth. The adjustment process does not require disassembly of components, making operation relatively convenient.

[0029] A square through hole 155 is provided in the middle of the square clamping plate 152, and the hand is inserted into the square through hole 155 to pull the square clamping plate outward; both ends of the lower part of the square clamping plate 152 are provided with hanging holes 156, and the two hanging holes are connected with tension springs 151. The two symmetrically arranged tension springs can provide greater pulling force for the connecting rod and ensure the stability of the connecting rod structure.

Claims

1. A sowing depth adjustment device based on a parallel linkage mechanism, characterized by: It includes a fixed seat and a lifting seat with a U-shaped cross-section. The fixed seat and the lifting seat are arranged side by side with a spacing between them. A furrowing plow is provided on the lower end plate of the lifting seat. An upper connecting rod assembly is hinged between the upper end of the fixed seat and the upper end of the lifting seat. A lower connecting rod assembly is hinged between the lower end of the fixed seat and the middle part of the lifting seat. The upper connecting rod assembly and the lower connecting rod assembly are arranged parallel to each other to form a parallelogram connecting rod structure, and an elastic pulling mechanism is provided between the upper connecting rod assembly and the fixed seat.

2. A sowing depth adjustment device based on a parallel linkage mechanism according to claim 1, characterized in that: The upper connecting rod assembly includes two upper rod bodies arranged side by side, the ends of the upper rod bodies are fixedly connected by sleeves, and upper transverse shafts are provided between the side plates of the upper ends of the fixed seat and the lifting seat, and the two upper transverse shafts are rotatably sleeved in the two sleeves.

3. The sowing depth adjustment device based on the parallel linkage mechanism according to claim 2 is characterized in that: The lower connecting rod assembly includes two lower rod bodies arranged side by side, the ends of the two lower rod bodies are fixedly connected as a whole through a supporting cross bar, a lower cross bar is provided between the lower end of the fixed seat and the middle part of the lifting seat, and the ends of the lower rod bodies are rotatably connected to the lower cross bar.

4. The sowing depth adjustment device based on a parallel linkage mechanism according to claim 3 is characterized in that: The elastic pulling mechanism includes a tension spring and a square clamping plate. Both ends of the square clamping plate are provided with a clamping boss. Several oblique grooves are provided at equal intervals on the surface of the upper rod body. The clamping bosses are matched and clamped in the oblique grooves, and a hanging hole is provided at the lower part of the square clamping plate. The upper end of the tension spring is hung in the hanging hole, and the lower end is hung with the lower cross bar.

5. The sowing depth adjustment device based on a parallel linkage mechanism according to claim 4 is characterized in that: A square through hole is provided in the middle of the square clamping plate.

6. The sowing depth adjustment device based on a parallel linkage mechanism according to claim 4 is characterized in that: Both ends of the lower part of the square clamping plate are provided with hanging holes, and tension springs are connected in the two hanging holes.

7. The sowing depth adjustment device based on a parallel linkage mechanism according to claim 1 is characterized in that: Extension plates are provided on both sides of the docking surface of the fixing seat, and a clamping groove is provided in the middle of the extension plate.

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