Compound control hydraulic system of seeding machine and seeding machine

Abstract

The application relates to the technical field of seeding machine hydraulic control, in particular to a seeding machine composite control hydraulic system and a seeding machine. The seeding machine composite control hydraulic system comprises a left arm oil cylinder, a right arm oil cylinder, a main control valve assembly, a reversing valve assembly and a lifting oil cylinder, an oil supply port is connected with an oil supply assembly outlet, an oil return port is connected with a tractor liquid tank, the main control valve assembly comprises a cylinder body, a first hydraulic control component and a second hydraulic control component arranged in the cylinder body, the cylinder body comprises a third port, one end of the third port is connected with the second port, the other end of the third port is connected with the first end of the second hydraulic control component, one end of the first hydraulic control component is connected with the first port, and the other end of the first hydraulic control component is respectively connected with the other end of the left arm oil cylinder and the other end of the right arm oil cylinder. The seeding machine composite control hydraulic system realizes the control function of the seeding machine function module through the main control valve, so that the seeding time is saved and the seeding operation efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of hydraulic control technology for seeders, and in particular to a composite control hydraulic system for a seeder and a seeder. Background Technology

[0002] As farmland is increasingly cultivated on large plots, the demand for tilling, sowing, and fertilization is also rising. Mechanized operations require frequent transfers, rerouting, and rearranging between different plots, resulting in significant time wasted on non-productive processes. Achieving rapid operation has become a problem that needs to be solved. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the technical problems in the related art.

[0004] Therefore, embodiments of the present invention propose a composite control hydraulic system for a seeder, which uses a main control valve to control the functional modules of the seeder, thereby saving sowing time and improving sowing efficiency.

[0005] The composite control hydraulic system for a seeder according to an embodiment of the present invention includes: A reversing valve assembly, comprising a first port, a second port, an oil supply port, and an oil return port, wherein the oil supply port is connected to the outlet of the fluid supply assembly, and the oil return port is connected to the tractor's fluid tank; in a first state, the oil supply port is connected to the second port, and the oil return port is connected to the first port; in a second state, the oil supply port is connected to the first port, and the oil return port is connected to the second port. A lifting cylinder, one end of which is connected to the second port and the other end of which is connected to the first port; The system includes a left arm cylinder, a right arm cylinder, and a main control valve assembly. The main control valve assembly includes a cylinder body, a first hydraulic control component, and a second hydraulic control component disposed within the cylinder body. The cylinder body includes a third port, one end of which is connected to the second port, and the other end of which is connected to the first end of the second hydraulic control component. The second end of the second hydraulic control component is connected to one end of the left arm cylinder, and the third end of the second hydraulic control component is connected to one end of the right arm cylinder. One end of the first hydraulic control component is connected to the first port, and the other end of the first hydraulic control component is connected to the other ends of the left arm cylinder and the right arm cylinder, respectively.

[0006] The second hydraulic control component has a third state and a fourth state. In the third state, the first end of the second hydraulic control component outputs fluid unidirectionally to the left arm cylinder, and the second end of the second hydraulic control component is connected to the right arm cylinder. In the fourth state, the first end of the second hydraulic control component is connected to the left arm cylinder, and the second end of the second hydraulic control component outputs liquid unidirectionally to the right arm cylinder.

[0007] The composite control hydraulic system for the seeder in this embodiment of the invention controls the functional modules of the seeder through a main control valve, thereby saving sowing time and improving sowing efficiency. In some embodiments, the left arm cylinder, right arm cylinder, and lifting cylinder each include a cylinder body and a piston rod. One end of the piston rod is disposed within the cylinder body to divide the hydraulic chamber of the cylinder body into a small chamber and a large chamber, and the other end of the piston rod extends out of the cylinder body. The large cavity of the lifting cylinder is connected to the second port, and the small cavity of the lifting cylinder is connected to the first port; The second hydraulic control component is connected to the large chambers of the left and right arm cylinders respectively, and the first hydraulic control component is connected to the small chambers of the left and right arm cylinders respectively.

[0008] In some embodiments, the second hydraulic control component includes a main valve core, a flow direction control component, a first check valve, and a first flow regulating valve. The cylinder body has a first chamber, a first orifice, a second orifice, and a first flow path. The main valve core is movably disposed within the first cavity in the cylinder width direction, and the outer peripheral surface of the main valve core is in contact with the inner wall of the first cavity. The main valve core has a first annular groove, a second annular groove, and a third annular groove arranged sequentially and at intervals in the cylinder width direction. The main valve core has a first throttling orifice and a second throttling orifice. The first throttling orifice connects to the first and second annular grooves, and the second throttling orifice connects to the second and third annular grooves. One end of the first flow path communicates with the second annular groove, and the other end of the first flow path is connected to the first check valve and the flow regulating valve, respectively. The main valve core has a first pilot flow path communicating with the first annular groove and a second pilot flow path communicating with the third annular groove at both ends in the cylinder width direction. Both the first pilot flow path and the second pilot flow path are connected to the first cavity. Both the first and second holes are equipped with flow direction control components. The main valve core moves in the width direction of the cylinder body to change the opening state of the flow direction control components in the first or second hole. The main valve core has a first position and a second position. In the first position, the flow direction control component of the first orifice is opened to allow the liquid in the first annular groove to flow unidirectionally towards the first orifice. The flow direction control component of the second orifice is opened to allow the third annular groove to communicate with the second orifice. In the second position, the flow direction control component of the first hole is closed to connect the first hole and the first annular groove, and the flow direction control component of the second hole is opened to allow the liquid in the third annular groove to flow unidirectionally to the second hole.

[0009] In some embodiments, the radial dimensions of at least a portion of the first and second throttling orifices gradually increase along the direction close to the second annular groove.

[0010] In some embodiments, the flow direction control component includes a slider, an elastic element, a valve ball, and a hollow element; both the first hole and the second hole include a mounting section and a connecting section connected in sequence, wherein the radial dimension of the connecting section is smaller than the radial dimension of the mounting section. The hollow component has a through hole, one end of the elastic element is disposed within the through hole, and the other end of the elastic element abuts against the valve ball. The radial dimension of the valve ball is larger than the radial dimension of the connecting section, and the sliding ball is at least partially disposed within the connecting section. The main valve core moves in the width direction of the cylinder body to move the slider in the height direction of the cylinder body, so that the end of the valve ball away from the elastic element is suitable for opening or closing the connection section.

[0011] In some embodiments, the size of the first annular groove in the radial direction of the main valve core gradually increases in the direction away from the first hole, and the size of the third annular groove in the radial direction of the main valve core gradually increases in the direction away from the second hole.

[0012] In some embodiments, the composite control hydraulic system of the seeder further includes a positioning component. The cylinder has a mounting hole, and one end of the positioning component is installed in the mounting hole. The positioning component includes a seal, a positioning ball, and an elastic abutment. One end of the elastic abutment is connected to the seal, and the other end of the elastic abutment is connected to the positioning ball. A conical ring is provided in the second annular groove, and the conical ring is located at the center of the main valve core axially.

[0013] In some embodiments, the tapered ring first decreases and then increases along the axial direction of the main valve core.

[0014] In some embodiments, the first hydraulic control component includes a second check valve and a second flow regulating valve. One end of the second check valve is connected to the small chambers of the left arm cylinder and the right arm cylinder, and the other end of the second check valve is connected to the first port. One end of the second flow regulating valve is connected to the small chambers of the left arm cylinder and the right arm cylinder, and the other end of the second flow regulating valve is connected to the first port.

[0015] In some embodiments, there are multiple lifting cylinders connected in series. The large cavity of the first lifting cylinder is connected to the second port, and the small cavities of each subsequent lifting cylinder are connected to the large cavity of the next lifting cylinder in sequence. The small cavity of the last lifting cylinder is connected to the first port.

[0016] The seeder of this invention includes: a composite control hydraulic system for the seeder, wherein the composite control hydraulic system for the seeder is the composite control hydraulic system for the seeder described above; A ground wheel, which is connected to the lifting cylinder; A left and a right marking device are provided, wherein the left marking device is connected to the left arm cylinder and the right marking device is connected to the right arm cylinder.

[0017] The seeder of the present invention adopts the above-mentioned composite control hydraulic system for seeders to realize the control functions of the seeder's functional modules, thereby saving sowing time and improving sowing efficiency. Attached Figure Description

[0018] Figure 1 This is one of the schematic diagrams of the composite control hydraulic system of the seeder in this embodiment of the invention.

[0019] Figure 2 This is the second schematic diagram of the composite control hydraulic system of the seeder in this embodiment of the invention.

[0020] Figure 3 This is the third schematic diagram of the composite control hydraulic system of the seeder in this embodiment of the invention.

[0021] Figure 4 This is the fourth schematic diagram of the composite control hydraulic system of the seeder in this embodiment of the invention.

[0022] Figure 5 This is the fifth schematic diagram of the composite control hydraulic system of the seeder in this embodiment of the invention.

[0023] Figure 6 This is the sixth schematic diagram of the composite control hydraulic system of the seeder in this embodiment of the invention.

[0024] Figure 7 This is a cross-sectional schematic diagram of the second hydraulic control component according to an embodiment of the present invention.

[0025] Figure 8 This is a schematic diagram of the main valve core according to an embodiment of the present invention.

[0026] Figure 9 This is a schematic diagram of the main control valve assembly according to an embodiment of the present invention.

[0027] Figure 10 This is a schematic diagram of the second flow regulating valve according to an embodiment of the present invention.

[0028] Figure 11 This is a schematic diagram of the large and small cavities of the lifting cylinder, left arm cylinder, and right arm cylinder of the present invention.

[0029] Figure label: Reversing valve assembly 1, Lifting cylinder 2, hydraulic tank 3, left arm cylinder 5, right arm cylinder 4 Main control valve assembly 6, first hydraulic control component 61, second check valve 611, second flow regulating valve 612 Second hydraulic control component 62, main valve core 621, first annular groove 6211, second annular groove 6212, third annular groove 6213, first pilot flow path 6214, second pilot flow path 6215, first throttling orifice 6216, second throttling orifice 6217. First check valve 622, first flow regulating valve 623, flow direction control component 624, slider 6241, elastic element 6242, valve ball 6243, hollow component 6244. Cylinder block 63, first hole 631, second hole 632, third port 633, first cavity 636, first flow path 637. Positioning component 64, sealing component 641, positioning ball 642, elastic abutment component 643. Conical ring 65, 7. Large chamber, 8. Small chamber, 9. Piston rod, 10. Tractor oil source. Detailed Implementation

[0030] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0031] The composite control hydraulic system for a seeder according to an embodiment of the present invention includes: The system comprises a directional valve assembly 1, a lifting cylinder 2, a left arm cylinder 5, a right arm cylinder 4, and a main control valve assembly. The directional valve assembly 1 includes a first port, a second port, a supply port, and a return port. The supply port is connected to the outlet of the fluid supply assembly, and the return port is connected to the tractor's fluid tank 3. In the first state, the oil supply port is connected to the second port and the oil return port is connected to the first port; in the second state, the oil supply port is connected to the first port and the oil return port is connected to the second port. One end of the lifting cylinder 2 is connected to the second port, and the other end of the lifting cylinder 2 is connected to the first port; The main control valve assembly includes a cylinder body 63, a first hydraulic control component 61 and a second hydraulic control component 62 disposed within the cylinder body 63. The cylinder body 63 includes a third port 633, one end of which is connected to the second port, and the other end of which is connected to the first end of the second hydraulic control component 62. The second end of the second hydraulic control component 62 is connected to one end of the left arm cylinder 5, and the third end of the second hydraulic control component 62 is connected to one end of the right arm cylinder 4. One end of the first hydraulic control component 61 is connected to the first port, and the other end of the first hydraulic control component 61 is connected to the other end of the left arm cylinder 5 and the other end of the right arm cylinder 4, respectively.

[0032] The second hydraulic control unit 62 has a third state and a fourth state. In the third state, the first end of the second hydraulic control component 62 outputs liquid unidirectionally to the left arm cylinder 5, and the second end of the second hydraulic control component 62 is connected to the right arm cylinder 4. In the fourth state, the first end of the second hydraulic control component 62 is connected to the left arm cylinder 5, and the second end of the second hydraulic control component 62 outputs liquid unidirectionally to the right arm cylinder 4.

[0033] Specifically, such as Figures 1 to 6 As shown, the tractor oil source 10 can be a liquid tank 3 and an oil pump. The oil pump inlet is connected to the liquid tank 3, the oil pump outlet is connected to the oil supply port, and the oil return port is connected to the liquid tank 3 so as to recover the oil after the valve or cylinder is activated back to the liquid tank 3.

[0034] In the first state, the oil supply port of the reversing valve assembly 1 is connected to the second port to output liquid to the lifting cylinder 2. Then the lifting cylinder 2 extends and the return port is connected to the first port to receive the liquid output by the lifting cylinder 2.

[0035] In the second state, the oil supply port is connected to the first port to output liquid to the lifting cylinder 2. Then the lifting cylinder 2 retracts, and the oil return port is connected to the second port to receive the liquid output by the lifting cylinder 2.

[0036] like Figures 1 to 6 As shown, one end of the first hydraulic control component 61 is connected to the first port, and the other end of the first hydraulic control component 61 is connected to one end of the left arm cylinder 5 and the right arm cylinder 4 respectively. The first end of the second hydraulic control component 62 is connected to the third port 633, the second section of the second hydraulic control component 62 is connected to the other end of the left arm cylinder 5, and the third end is connected to the other end of the right arm cylinder 4. like Figures 1 to 6 As shown, in the first state, and with the second hydraulic control component 62 in the third state, the oil supply port is connected to the second port, the second port is connected to the third port 633, and the third port 633 is connected to the first end of the second hydraulic control component 62 to output liquid to the left arm cylinder 5 and the right arm cylinder 4, causing the left arm cylinder 5 and the right arm cylinder 4 to extend. The left arm cylinder 5 and the right arm cylinder 4 are connected, and the left arm cylinder 5 and the right arm cylinder 4 are respectively connected to the left and right marking devices of the seeder. At this time, the lifting cylinder 2 extends and is connected to the ground wheel of the seeder.

[0037] like Figures 1 to 6 As shown, when the reversing valve assembly 1 is in the first state and the second hydraulic control component 62 is in the fourth state, the lifting cylinder 2 is extended and connected to the ground wheel of the seeder. The second end of the second hydraulic control component 62 outputs liquid unidirectionally to the right arm cylinder 4, and the first end of the second hydraulic control component 62 is connected to the left arm cylinder 5. At this time, the left arm cylinder 5 and the right arm cylinder 4 are extended.

[0038] like Figures 1 to 6As shown, when the reversing valve assembly 1 is in the second state and the second hydraulic control component 62 is in the third state, the oil supply port is connected to the first port, and the oil return port is connected to the second port. The second end of the second hydraulic control component 62 outputs liquid unidirectionally to the left arm cylinder 5, and the third end of the second hydraulic control component 62 is connected to the right arm cylinder 4. Since the left arm cylinder 5 can only output liquid unidirectionally from the second end of the second hydraulic control component 62, the state of the left arm cylinder 5 remains unchanged, and the right arm cylinder 4 retracts, or the right arm cylinder 4 changes from the extended state to the retracted state. The lifting cylinder 2 retracts.

[0039] like Figures 1 to 6 As shown, when the directional valve assembly 1 is in the second state and the second hydraulic control component 62 is in the fourth state, the oil supply port is connected to the first port and the oil return port is connected to the second port; the second end of the second hydraulic control component 62 is connected to the left arm cylinder 5, and the third end of the second hydraulic control component 62 outputs liquid unidirectionally to the right arm cylinder 4. Therefore, the right arm cylinder 4 remains in the same state, the lifting cylinder 2 retracts, and the left arm cylinder 5 is either in a retracted state or changes from an extended state to a retracted state.

[0040] The composite hydraulic control system for the seeder in this embodiment of the invention integrates a first hydraulic control component 61 and a second hydraulic control component 62 within the main control valve assembly. By using only two working states (first state / second state) of a single directional valve assembly 1 and two switching states (third state / fourth state) of the second hydraulic control component 62, the extension or retraction of the lifting cylinder 2, the extension, holding, or retraction of the left arm cylinder 5, and the extension, holding, or retraction of the right arm cylinder 4 can be controlled respectively. This eliminates the need for multiple independent directional valves, resulting in a compact system structure and simplified hydraulic piping. The main control valve enables control of the seeder's functional modules, saving sowing time and improving sowing efficiency. The independent and asymmetrical control of the left and right arms allows the seeder to retract only one side of the marking device while maintaining the working posture on the other side during field turns, field maneuvers, and obstacle avoidance maneuvers, reducing ineffective movements and improving operational continuity. Hydraulic control replaces manual operation of multiple machines or valves, reducing the driver's workload and the probability of misoperation; the ability to quickly switch states enables the seeder to sow quickly and efficiently during the busy farming season, increasing the number of acres worked per unit time.

[0041] like Figures 1 to 6 and Figure 11 As shown, in some embodiments, the left arm cylinder 5, the right arm cylinder 4, and the lifting cylinder 2 all include a cylinder body and a piston rod 9. One end of the piston rod 9 is disposed within the cylinder body to divide the hydraulic chamber of the cylinder body into a small chamber 8 and a large chamber 7, and the other end of the piston rod 9 extends out of the cylinder body. The large chamber 7 of the lifting cylinder 2 is connected to the second port, and the small chamber 8 of the lifting cylinder 2 is connected to the first port; The second hydraulic control component 62 is connected at its second end to the large chamber 7 of the left arm cylinder 5, and at its third end to the large chamber 7 of the right arm cylinder 4. The first hydraulic control component 61 is connected to the small chamber 8 of the left arm cylinder 5 and the right arm cylinder 4, respectively.

[0042] Specifically, when oil is supplied to the large chamber 7 and the oil in the small chamber 8 can be discharged from the cylinder body, the piston rod 9 extends out of the cylinder body. When oil is supplied to the large chamber 7 and the oil in the small chamber 8 cannot be discharged from the cylinder body, the position of the piston rod 9 relative to the cylinder body remains unchanged. When oil is supplied to the small chamber 8 and the oil in the large chamber 7 can be discharged from the cylinder body, the piston rod 9 retracts. When oil is supplied to the small chamber 8 and the oil in the large chamber 7 cannot be discharged from the cylinder body, the position of the piston rod 9 relative to the cylinder body remains unchanged.

[0043] This implementation controls the oil inlet of either the large chamber 7 or the small chamber 8 while simultaneously closing the return oil path of the other chamber, allowing the piston rod 9 to remain in its current position even when oil is supplied. This achieves hydraulic self-locking, eliminating the need for additional mechanical brakes or locking devices, resulting in a more compact structure and reduced size.

[0044] like Figures 1 to 11 As shown, in some embodiments, the second hydraulic control component 62 includes a main valve core 621, a flow direction control component 624, a first check valve 622, and a first flow regulating valve 623. The cylinder body 63 has a first chamber 636, a first hole 631, a second hole 632, and a first flow path 637. The main valve core 621 is movably disposed within the first cavity 636 in the width direction of the cylinder body 63, and the outer peripheral surface of the main valve core 621 is in contact with the inner wall surface of the first cavity 636. The main valve core 621 has a first annular groove 6211, a second annular groove 6212, and a third annular groove 6213 arranged sequentially and at intervals in the width direction of the cylinder body 63. The main valve core 621 has a first throttling orifice 634 and a second throttling orifice 635. The first throttling orifice 634 connects the first annular groove 6211 and the second annular groove 6212, and the second throttling orifice 635 connects the second annular groove 6212 and the third annular groove 6213. One end of the first flow path 637 is connected to the second annular groove 6212, and the other end of the first flow path 637 is connected to the first check valve 622 and the flow regulating valve, respectively. The main valve core 621 has a first pilot flow path 6214 communicating with the first annular groove 6211 and a second pilot flow path 6215 communicating with the third annular groove 6213 at both ends in the width direction of the cylinder body 63. Both the first pilot flow path 6214 and the second pilot flow path 6215 are connected to the first cavity 636. Both the first hole 631 and the second hole 632 are provided with flow direction control components 624. The main valve core 621 moves in the width direction of the cylinder body 63 to change the opening state of the flow direction control components 624 in the first hole 631 or the second hole 632. The main valve core 621 has a first position and a second position. In the first position, the flow direction control component 624 of the first hole 631 is opened to allow the liquid in the first annular groove 6211 to flow unidirectionally to the first hole 631. The flow direction control component 624 of the second hole 632 is opened to allow the third annular groove 6213 to communicate with the second hole 632. In the second position, the flow direction control component 624 of the first hole 631 is closed to connect the first hole 631 and the first annular groove 6211, and the flow direction control component 624 of the second hole 632 is opened to allow the liquid in the third annular groove 6213 to flow unidirectionally to the second hole 632.

[0045] Specifically, for ease of description, the width direction of the cylinder body 63 is the left-right direction as shown in the figure, and the height direction of the cylinder body 63 is the up-down direction. The first throttle hole 634 is used to connect the first annular groove 6211 and the second annular groove 6212. The second throttle hole 635 is used to connect the second annular groove 6212 and the third annular groove 6213. When the main valve core 621 moves in the left-right direction, the second annular groove 6212 is always connected to the first annular groove 6211 and the second annular groove 6212. Due to the existence of the first pilot flow path 6214 and the second pilot flow path 6215, the main valve core 621 moves to the left to the left side of the first cavity 636, i.e., the first position, and the main valve core 621 moves to the right to the right side of the first cavity 636, i.e., the second position.

[0046] The main valve core 621 moves left and right to switch between a first position and a second position. One end of the first flow path 637 is connected to the second annular groove 6212, and the other end is connected to the first check valve 622 and the first flow regulating valve 623. When liquid flows from the second annular groove 6212 to the first flow path 637, passes through the first end of the second hydraulic control component 62, and then flows out from the third port 633, due to the limiting effect of the first check valve 622, the liquid cannot flow out from the third port 633 through the first check valve 622. The liquid can only flow out from the first end of the second hydraulic control component 62 through the first flow regulating valve 623 and then out from the third port 633. At this time, the retraction speed of the right arm cylinder 4 or the left arm cylinder 5 can be controlled by controlling the liquid flow rate through the first flow regulating valve 623.

[0047] The main valve core 621 is arranged with a first annular groove 6211, a second annular groove 6212, and a third annular groove 6213 from left to right. The first pilot flow path 6214 is located on the left side of the main valve core, and the left end of the first pilot flow path 6214 is connected to the chamber on the left side of the first cavity 636. The right end of the first pilot flow path 6214 is connected to the left end of the first annular groove 6211. The second pilot flow path 6215 is located on the right side of the main valve core 621, and the left end of the second pilot flow path 6215 is connected to the chamber on the right side of the first cavity 636. The right end of the second pilot flow path 6215 is connected to the left end of the third annular groove 6213.

[0048] It should be noted that when the second hydraulic control component 62 is in the third state, i.e., the main valve core 621 is in the first position, the second end of the second hydraulic control component 62 outputs liquid unidirectionally to the left arm cylinder 5. That is, the flow direction control component 624 of the first hole 631 is opened so that the liquid in the first annular groove 6211 flows unidirectionally to the first hole 631. In other words, the liquid in the first annular groove 6211 can only flow unidirectionally to the large chamber 7 of the left arm cylinder 5, and cannot flow from the large chamber 7 of the left arm cylinder 5 to the first annular groove 6211, i.e., the second end of the second hydraulic control component 62. The liquid in the large chamber 7 of the right arm cylinder 4 can flow back to the third annular groove 6213, or the liquid in the third annular groove 6213 can be output to the large chamber 7 of the right arm cylinder 4. When the right arm cylinder 4 retracts, the liquid in the third annular groove 6213 also flows back to the liquid tank 3 through the second annular groove 6212, the first flow regulating valve 623, the third port 633, and the return port. At this time, the liquid return flow rate can be adjusted by regulating the first flow regulating valve 623 to adjust the retraction speed of the right arm cylinder 4.

[0049] When the second hydraulic control component 62 is in the fourth state, i.e., the main valve core 621 is in the second position, the second end of the second hydraulic control component 62 is connected to the left arm cylinder 5, and the third end of the second hydraulic control component 62 outputs liquid unidirectionally to the right arm cylinder 4. The flow direction control component 624 of the first hole 631 is closed to connect the first hole 631 and the first annular groove 6211, and the flow direction control component 624 of the second hole 632 is opened to allow the liquid in the third annular groove 6213 to flow unidirectionally to the second hole 632. That is, the liquid in the large chamber 7 of the left arm cylinder 5 can flow back to the first annular groove 6211, or the liquid in the first annular groove 6211 can be output to the large chamber 7 of the left arm cylinder 5. However, the liquid in the third annular groove 6213 can only flow unidirectionally to the large chamber 7 of the right arm cylinder 4, and the liquid in the large chamber 7 of the right arm cylinder 4 cannot flow back to the third annular groove 6213. When the left arm cylinder 5 retracts, the liquid in the first annular groove 6211 flows back to the liquid tank 3 through the second annular groove 6212, the first flow regulating valve 623, the third port 633, and the return port. At this time, the retraction speed of the left arm cylinder 5 can be adjusted by regulating the liquid return flow rate through the first flow regulating valve 623. That is, when the second hydraulic control component 62 is in the third state, the main valve core 621 is in the first position. When the second hydraulic control component 62 is in the fourth state, the main valve core 621 is in the second position.

[0050] like Figure 1 , Figure 2 , Figure 3 , Figure 6 and Figure 7As shown, when the main valve core 621 is in the first position, the flow direction control component 624 of the first hole 631 is opened to allow the liquid in the first annular groove 6211 to flow unidirectionally to the first hole 631, and the flow direction control component 624 of the second hole 632 is opened to allow the third annular groove 6213 to communicate with the second hole 632. At this time, when the right arm cylinder 4 is in the retracted state or changes from the extended state to the retracted state, the directional valve assembly 1 is in the second state. If it is necessary to turn the main valve core 621 to the second position, the directional valve assembly 1 is switched from the second state back to the first state, the oil supply port is connected to the second port, and the oil return port is connected to the first port. At this time, hydraulic oil with a certain pressure enters the third port 633 from the second port, and then enters the second annular groove 6212 through the first single valve. At this time, the first chamber 636, the first annular groove 6211, the second annular groove 6212 and the third annular groove 6213 are all filled with liquid. Since the third annular groove 6213 is connected to the second hole 632, At this time, the liquid in the third annular groove 6213 inevitably supplies liquid to the large chamber 7 of the right arm cylinder 4. Then, the oil pressure on the side of the third annular groove 6213 is less than the oil pressure on the side of the first annular groove 6211. The main valve core 621 moves to the second position, thereby placing the main valve core 621 in the second position. This changes the state of the flow direction control component 624 of the first hole 631 and the second hole 632, so that the flow direction control component 624 of the second hole 632 is opened and the flow direction control component 624 of the first hole 631 is closed.

[0051] When the main valve core 621 is in the second position, the flow direction control component 624 of the first hole 631 is closed to connect the first hole 631 and the first annular groove 6211, and the flow direction control component 624 of the second hole 632 is opened to allow the liquid in the third annular groove 6213 to flow unidirectionally to the second hole 632. When the left arm cylinder 5 is in the retracted state or changes from the extended state to the retracted state, that is, when the reversing valve assembly 1 is in the second state. If it is necessary to switch the main valve core 621 from the second position to the first position, the directional valve assembly 1 is switched back from the second state to the first state, the oil supply port is connected to the second port, and the oil return port is connected to the first port. At this time, hydraulic oil with a certain pressure enters the third port 633 from the second port, and then enters the second annular groove 6212 through the first single valve. At this time, the first chamber 636, the first annular groove 6211, the second annular groove 6212 and the third annular groove 6213 are all filled with liquid. Since the first annular groove 6211 is connected to the first hole 631, the liquid in the first annular groove 6211 will inevitably supply liquid to the large chamber 7 of the left arm cylinder 5. At this time, the oil pressure on the side of the first annular groove 6211 is less than the oil pressure on the side of the third annular groove 6213, so that the main valve core 621 moves to the first position, and then the main valve core 621 is in the second position.

[0052] It is understandable that when the main valve core 621 is in the first position or the second position, and the second port is not connected to the oil supply port, that is, when the directional valve assembly 1 is in the second state, the position of the main valve core 621 will not change.

[0053] In this embodiment of the invention, when the main valve core 621 is in the second position and the directional valve assembly 1 is in the second state, the parallel oil circuit of the first check valve 622 and the first flow regulating valve 623 enables independent adjustment of the retraction speed of the left arm cylinder 5 or the right arm cylinder 4. The returning liquid returns to the oil tank via the first flow regulating valve 623, while ensuring that the oil bypasses through the first check valve 622 during the extension action, meeting the requirements of slow recovery conditions. When the directional valve assembly 1 is in the first state, regardless of whether the main valve core 621 is in the second or first position, the left arm cylinder 5 and the right arm cylinder 4 extend, and the first check valve 622 prevents liquid backflow, thus increasing the extension speed to a certain extent. The left and right movement of the main valve core 621, i.e., the switching between the first and second positions, depends on the state switching of the directional valve assembly 1, eliminating the need for a separate pilot control oil circuit or solenoid valve, improving reliability, reducing control complexity, reducing the size of the main control valve assembly, improving system integration, avoiding the simultaneous operation of multiple valves or components, improving ease of use, and reducing the labor intensity of operators.

[0054] Furthermore, when the main valve core 621 is in the first position, the flow direction control component 624 of the first hole 631 only allows unidirectional flow from the first annular groove 6211 to the large chamber 7 of the left arm cylinder 5, preventing reverse oil return and thus achieving hydraulic locking. Similarly, in the second position, the flow direction control component 624 of the second hole 632 only allows unidirectional flow from the third annular groove 6213 to the large chamber 7 of the right arm cylinder 4, locking the right arm cylinder 4. This prevents abnormal cylinder retraction due to load gravity or external impact, improving system safety.

[0055] Furthermore, the radial dimensions of at least a portion of the first throttling orifice 634 and the second throttling orifice 635 gradually increase along the direction close to the second annular groove 6212.

[0056] like Figure 7 and 8 As shown, in some embodiments, the flow control component 624 includes a slider 6241, an elastic element 6242, a valve ball 6243, and a hollow component 6244. The first hole 631 and the second hole 632 each include a mounting section and a connecting section connected sequentially. The radial dimension of the connecting section is smaller than the radial dimension of the mounting section. The hollow component 6244 has a through hole, one end of the elastic component 6242 is disposed in the through hole, and the other end of the elastic component 6242 abuts against the valve ball 6243. The radial dimension of the valve ball 6243 is larger than the radial dimension of the connecting section, and the sliding ball 6241 is at least partially disposed in the connecting section. The main valve core 621 moves in the width direction of the cylinder body 63 to move the sliding ball 6241 in the height direction of the cylinder body 63, so that the end of the valve ball 6243 away from the elastic element 6242 is suitable for opening or closing the connecting section. The upper end of the mounting section communicates with the through hole, the lower end of the connecting section communicates with the first cavity 636, the lower end of the connecting section of the first hole 631 communicates with the first annular groove 6211, and the lower end of the connecting section of the second hole 632 communicates with the third annular groove 6213. The radial dimension of the sliding ball 6241 is smaller than the radial dimension of the connecting section.

[0057] Specifically, the hollow component 6244 has a hollow structure, i.e., it has a through hole. An elastic component 6242 is installed inside the hollow component 6244, with its upper end either directly abutting against the upper end of the elastic component 6242. The lower end of the elastic component 6242 abuts against a valve ball 6243. The valve ball 6243 moves downward to block the connecting section, or it rises to open the connecting section, allowing the upper end of the connecting section to communicate with the lower end of the mounting section. This allows either the first hole 631 or the second hole 632 to be in a bidirectional flow state. For ease of description, the mounting section of the first hole 631 is referred to as the first mounting section, the mounting section of the second hole 632 as the second mounting section, the connecting section of the second hole 632 as the second connecting section, and the connecting section of the first hole 631 as the first connecting section.

[0058] like Figure 1 , Figure 2 , Figure 3 , Figure 6 and Figure 7 As shown, when the main valve core 621 is in the first position, the sliding ball 6241 on the first connecting section moves down to the first annular groove 6211 so that the sliding ball 6241 extends out of the first connecting section. Then, the valve ball 6243 in the first mounting section moves down to block the first connecting section, so that the first hole 631 is in a unidirectional flow state. That is, the liquid in the first annular groove 6211 can be output to the large chamber 7 of the left arm cylinder 5 through the first hole 631, but the oil in the large chamber 7 of the left arm cylinder 5 cannot flow back to the first annular groove 6211. At this time, the sliding ball 6241 of the second connecting section moves up so that the valve ball 6243 of the second mounting section moves up away from the upper end of the second connecting section, thus connecting the second mounting section and the second connecting section bidirectionally. At this time, the oil in the third annular groove 6213 enters the second mounting section through the gap between the sliding ball 6241 of the second connecting section and the inner wall of the second connecting section. Alternatively, the oil in the second mounting section can flow back to the third annular groove 6213.

[0059] like Figure 4 , Figure 5 and Figure 8When the main valve core 621 is in the second position, the sliding ball 6241 on the second connecting section moves down to the second annular groove 6212 so that the sliding ball 6241 at least partially extends out of the second connecting section. Then, the valve ball 6243 in the second mounting section moves down to block the second connecting section, so that the second hole 632 is in a unidirectional flow state. That is, the liquid in the third annular groove 6213 can be output to the large chamber 7 of the right arm cylinder 4 through the second hole 632, but the oil in the large chamber 7 of the right arm cylinder 4 cannot flow back to the third annular groove 6213. At this time, the sliding ball 6241 of the first connecting section moves up so that the valve ball 6243 of the first mounting section moves up away from the upper end of the first connecting section, thus connecting the first mounting section and the first connecting section bidirectionally. At this time, the oil in the first annular groove 6211 enters the first mounting section through the gap between the sliding ball 6241 of the first connecting section and the inner wall of the first connecting section. Alternatively, the oil in the first mounting section can flow back to the first annular groove 6211. That is, the large chamber 7 of the left arm hydraulic cylinder 5 is bidirectionally connected to the first annular groove 6211.

[0060] like Figure 3 and Figure 5 When the reversing valve assembly 1 is in the second state, and it is necessary to switch the main valve core 621 from the first position to the second position, that is... Figures 7 to 8 When the position of the main valve core 621 changes, the directional valve assembly 1 needs to be switched to the first state. At this time, the oil output from the oil supply port passes through the second port 633 and the third port 633, and is input into the first annular groove 6211 and the third annular groove 6213 through the second annular groove 6212. Because in the first position, the liquid in the large chamber 7 of the right arm cylinder 4 can flow back to the second annular groove 6212 through the second hole 632, while the liquid in the large chamber 7 of the left arm cylinder 5 cannot flow back to the first annular groove 6211 through the first hole 631. When the reversing valve assembly 1 switches to the first state, the oil in the third annular groove 6213 is output to the large chamber 7 of the right arm cylinder 4. Since there is no return flow in the left arm cylinder 5, the oil pressure on the left side of the main valve core 621 in the first chamber 636 is greater than the oil pressure on the right side. At the same time, the oil pressure in the first annular groove 6211 is greater than the oil pressure in the third annular groove 6213. Consequently, the main valve core 621 moves to the right to the second position. After the main valve core 621 moves to the second position, the sliding ball 6241 on the second connecting section moves down to the third annular groove 6213 so that at least part of the sliding ball 6241 is at least partially moved down to the third annular groove 6213. The second connecting section extends outwards, and then the valve ball 6243 in the second mounting section moves downwards to block the second connecting section, so that the second hole 632 is in a unidirectional flow state. That is, the liquid in the third annular groove 6213 can be output to the large chamber 7 of the right arm cylinder 4 through the second hole 632, but the oil in the large chamber 7 of the right arm cylinder 4 cannot flow back to the third annular groove 6213. At this time, the sliding ball 6241 of the first connecting section moves upwards to make the valve ball 6243 of the first mounting section move upwards away from the upper end of the first connecting section, thereby connecting the first mounting section and the first connecting section in both directions.

[0061] like Figure 3 and Figure 5When the directional valve assembly 1 is in the second state, and it is necessary to switch the main valve core 621 from the second position to the first position, the directional valve assembly 1 needs to be switched to the first state. At this time, the oil output from the oil supply port passes through the second port 633, the third port 633, and the second annular groove 6212 into the first annular groove 6211 and the third annular groove 6213. Since the main valve core is in the second position, the oil in the left arm cylinder 5 can flow back to the first annular groove 6211. And because the directional valve assembly 1 is in the second state at that time, the left arm cylinder 5 retracts. At this point, the directional valve assembly 1 is switched to the first state. The oil in the first annular groove 6211 is output to the main chamber 7 of the left arm cylinder 5. Since there is no return flow in the right arm cylinder 4, the oil pressure on the right side of the main valve core 621 in the first chamber 636 is greater than the oil pressure on the left side. Simultaneously, the oil pressure in the third annular groove 6213 is greater than the oil pressure in the first annular groove 6211. Consequently, the main valve core 621 moves to the left to the first position. After the main valve core 621 moves to the first position, the sliding ball 6241 on the first connecting section moves to the first annular groove 6211 so that the sliding ball 6241 at least partially extends out of the second connecting section. The valve ball 6243 in the first installation section moves down to block the first connecting section, so that the first hole 631 is in a unidirectional flow state. That is, the liquid in the first annular groove 6211 can be output to the large chamber 7 of the left arm cylinder 5 through the first hole 631, but the oil in the large chamber 7 of the left arm cylinder 5 cannot flow back to the first annular groove 6211. At this time, the sliding ball 6241 of the second connecting section moves up to make the valve ball 6243 of the second installation section move up away from the upper end of the second connecting section, thereby connecting the second installation section and the second connecting section in both directions.

[0062] refer to Figures 1 to 6 In short, when the directional valve assembly 1 is in the first state, both the left arm cylinder 5 and the right arm cylinder 4 are extended, and the main valve core 621 is in the first position (i.e., the second hydraulic control component 62 is in the third state), and it is necessary to switch the main valve core 621 from the first position to the second position, the directional valve assembly 1 is first switched to the second state. As mentioned above, at this time, the left arm cylinder 5 remains extended, the right arm cylinder 4 extends and retracts, and the main valve core 621 remains unchanged. Then, the directional valve assembly 1 is switched back to the first state. Since the hydraulic pressure on the left side of the main valve core 621 is greater than the hydraulic pressure on the right side, the main valve core 621 moves to the second position, at which point both the left arm cylinder 5 and the right arm cylinder 4 are extended. If the directional valve assembly 1 is then switched back to the second state, the left arm cylinder 5 retracts while the right arm cylinder 4 remains extended.

[0063] It can be explained that when the directional valve assembly 1 is in the first state, the lifting cylinder 2 is extended. When the directional valve assembly 1 is in the second state, the lifting cylinder 2 is retracted.

[0064] In this embodiment, the sliding ball 6241 in the flow control component 624 is directly triggered by the left and right movement of the main valve core 621 to push the sliding ball 6241 in the height direction of the cylinder body 63, thereby controlling the up and down movement of the valve ball 6243 to control the flow direction of the first hole 631 and the second hole 632. This achieves a rigid correspondence between the position of the main valve core 621 and the on / off state of the oil circuit, eliminating the need for independent pilot hydraulic or electronic control signals, and eliminating the need for a separate check valve. This reduces the number of components and structural complexity, reduces external oil pipes and joints, thereby reducing system leakage points and manufacturing costs, lowering the probability of failure, and improving the reliability and anti-contamination capability of the switching mechanism.

[0065] In some embodiments, the size of the first annular groove 6211 in the radial direction of the main valve core 621 gradually increases in the direction away from the first hole 631, and the size of the third annular groove 6213 in the radial direction of the main valve core 621 gradually increases in the direction away from the second hole 632.

[0066] Specifically, such as Figure 7 and Figure 8 As shown, the first annular groove 6211 gradually increases in size from left to right in the radial direction of the main valve core 621 to form a slope, so that when the second position and the first position are switched back and forth, the left and right movement of the valve core allows the slider 6241 to move smoothly up and down under the action of the slope.

[0067] The third annular groove 6213 gradually increases in size from right to left in the radial direction of the main valve core 621 to form a slope, so that when switching between the second and first positions, the left and right movement of the valve core allows the slider 6241 to move smoothly up and down under the action of the slope. Furthermore, the slider 6241 and valve ball 6243 of the first hole 631 and the second hole 632 move in opposite directions when switching between the second and first positions. This implementation designs the radial dimension of the first annular groove 6211 to increase from left to right, and the radial dimension of the third annular groove 6213 to expand from right to left. When the main valve core 621 moves left or right, the sliding ball 6241 will naturally roll or slide along the slope, achieving a gradual rise or fall. This avoids collisions or jamming between the main valve core 621 and the sliding ball 6241, reducing wear on the sliding ball 6241 and the annular groove surface, making the reversing action smoother and more reliable. Simultaneously, the two annular grooves use opposite slopes, ensuring that the sliding balls 6241 and valve balls 6243 corresponding to the first hole 631 and the second hole 632 rise and fall in opposite directions when the main valve core 621 reverses direction—one rises while the other falls. This ensures that regardless of whether the main valve core 621 moves to the first or second position, the sliding balls 6241 corresponding to the first hole 631 and the second hole 632 can simultaneously complete their respective rising and falling actions, achieving one hole unidirectional locking and the other bidirectional connection, improving the stability and smoothness of liquid flow direction reversal.

[0068] In some embodiments, the composite control hydraulic system of the seeder further includes a positioning component 64. The cylinder body 63 has a mounting hole, and one end of the positioning component 64 is installed in the mounting hole. The positioning component 64 includes a seal 641, a positioning ball 642, and an elastic abutment 643. One end of the elastic abutment 643 is connected to the seal 641, and the other end of the elastic abutment 643 is connected to the positioning ball 642. A conical ring 65 is provided in the second annular groove 6212, and the conical ring 65 is located at the axial center of the main valve core 621.

[0069] Specifically, such as Figure 7 , Figure 8 and Figure 9 As shown, the seal 641 is installed in the mounting hole, and one end of the seal 641 is connected to or abuts against the elastic abutment 643. The other end of the elastic abutment 643 is connected to or abuts against one end of the positioning ball 642. The other end of the positioning ball 642 is in contact with the conical ring 65. The conical ring 65 is located at the axial center of the main valve core 621. When the main valve core 621 moves from the first position to the second position or from the second position to the first position, the positioning ball 642 rises and then falls. This implementation sets the highest point of the conical ring 65 at the axial center of the main valve core 621, and the positioning ball 642 is in its maximum compression state when in the center position. Once the main valve core 621 deviates from the center, the positioning ball 642 will slide to one side of the inclined surface of the conical ring 65, and the elastic force will push the main valve core 621 to continue moving towards both ends, thereby preventing the main valve core 621 from getting stuck in the middle position due to insufficient hydraulic pressure or friction, ensuring the stability of the main valve core 621 switching between the first and second positions, and improving the certainty of system operation. During the operation of agricultural machinery such as seeders, the machine body will be continuously subjected to impacts such as uneven ground and seed bed vibration. The mechanical locking / positioning mechanism formed by the elastic abutment 643 of the positioning component 64 and the conical ring 65 can reliably maintain the position of the main valve core 621, prevent the valve core from accidentally changing direction due to vibration, thereby avoiding malfunction of the hydraulic cylinder and ensuring consistent sowing depth and operational accuracy. The positioning component 64 is directly embedded in the mounting hole of the cylinder body 63 and mates with the conical ring 65 in the second annular groove 6212 of the main valve core 621, without requiring additional external space or an independent positioning device. This maintains the overall compactness of the hydraulic control components and facilitates their arrangement within the limited installation space of the seeder.

[0070] Furthermore, the conical ring 65 first decreases and then increases in size along the axial direction of the main valve core 621. The conical ring 65's axial profile—meaning it is thinner in the middle and thicker at both ends, or highest in the middle—cooperates with the positioning ball 642. When the main valve core 621 moves to the first or second position, the positioning ball 642 falls into the "recessed areas" on both sides of the conical ring 65, and the pre-pressure of the elastic abutment member 643 stabilizes the main valve core 621 at its end position. This prevents valve core drift due to vibration or pressure fluctuations, ensuring reliable switching. When the main valve core 621 switches between the second and first positions, the positioning ball 642 first rises along the slope of the conical ring 65, compressing the elastic abutment member 643 to store energy. After passing the highest point of the axial center, it descends along the other slope to release energy, propelling the main valve core 621 to accelerate towards the other end. The system's upward and downward movement achieves mechanical assisted jumping, which helps the main valve core 621 complete the reversal as quickly as possible, reduces the dwell time in the intermediate position, and improves the system's response speed.

[0071] In some embodiments, the first hydraulic control component 61 includes a second check valve 611 and a second flow regulating valve 612. One end of the second check valve 611 is connected to the small chamber 8 of the left arm cylinder 5 and the small chamber 8 of the right arm cylinder 4, and the other end of the second check valve 611 is connected to a first port. One end of the second flow regulating valve 612 is connected to the small chamber 8 of the left arm cylinder 5 and the small chamber 8 of the right arm cylinder 4, and the other end of the second flow regulating valve 612 is connected to the first port.

[0072] Specifically, such as Figure 2 , Figure 4 and Figure 6 As shown, when the reversing valve assembly 1 is in the first state, the oil supply port is connected to the second port and the oil return port is connected to the first port. At this time, since the second check valve 611 outputs oil to the small chambers 8 of the left arm cylinder 5 and the right arm cylinder 4 in one direction, the oil in the small chambers 8 of the left arm cylinder 5 and the right arm cylinder 4 can only return to the liquid tank 3 through the second flow regulating valve 612 and then through the first port. The speed of liquid return in the small chambers 8 of the left arm cylinder 5 and the right arm cylinder 4 can be controlled by the second flow regulating valve, thereby controlling the extension speed of the left arm cylinder 5 and the right arm cylinder 4.

[0073] like Figure 3 and Figure 5 As shown, when the reversing valve assembly 1 is in the second state, the oil supply port is connected to the first port, and the oil return port is connected to the second port. The first port outputs oil to the first hydraulic control component 61, and then outputs it through the second check valve 611 to the small chamber 8 of the left arm cylinder 5 and the small chamber 8 of the right arm cylinder 4. When the reversing valve assembly 1 is in the first state, the oil in the small chambers 8 of the left arm cylinder 5 and the right arm cylinder 4 can only return to the liquid tank 3 through the second flow regulating valve 612. The extension speed of the cylinder can be controlled by the opening of the second flow regulating valve 612 to meet different operating requirements.

[0074] like Figure 1-6 As shown, in some embodiments, there are multiple lifting cylinders 2 connected in series. The large cavity 7 of the first lifting cylinder 2 is connected to the second port, and the small cavity 8 of each subsequent lifting cylinder 2 is connected to the large cavity 7 of the next lifting cylinder 2 in sequence. The small cavity 8 of the last lifting cylinder 2 is connected to the first port.

[0075] This invention utilizes multiple hydraulic cylinders connected in series. When oil enters the large chamber 7 of the first cylinder, the pistons of all cylinders move simultaneously, achieving multi-stage synchronous extension and retraction without the need for additional synchronization valves. This ensures consistent lifting and lowering of each unit or frame of the seeder. Only one directional valve (through the second and first ports) is needed to control the extension and retraction of all connected cylinders, eliminating the need for independent directional valves or synchronization distributors for each cylinder. This simplifies the piping, reduces leakage points, and ensures that the system working pressure is transmitted step-by-step. Each cylinder bears a relatively equal load, preventing overload of individual cylinders and extending cylinder life.

[0076] The reversing valve assembly 1 also has a closed state, in which the oil supply port, the second port, the oil return port, and the first port are not connected to each other.

[0077] The following analyzes the operation process of the embodiments of the present invention.

[0078] Step 1: As Figure 1 As shown, the reversing valve assembly 1 is in the initial state, that is, the closed state, that is, the reversing valve assembly 1 is in a state where the oil supply port, the second port, the oil return port and the first port are not connected to each other. At this time, the left arm cylinder 5 and the right arm cylinder 4 are also in the fully retracted state, and the whole machine is on standby and remains stationary.

[0079] Step 2: As Figure 2As shown, when the reversing valve assembly 1 is switched to the first state, the oil supply port is connected to the second port, and the oil return port is connected to the first port. The pressurized oil is output from its outlet and divided into two branches. One branch goes through the second port to the large chamber 7 of the lifting cylinder 2, causing the whole machine to rise. The other branch goes through the second port to the main control valve assembly, and after passing through the first flow valve, it reaches the main valve core 621. The main valve core 621 is in the first position, and the pressurized oil goes directly to the large chamber 7 of the left arm cylinder 5 and the right arm cylinder 4. The left arm cylinder 5 and the right arm cylinder 4 extend outwards at the same time. When the lifting cylinder 2, the left arm cylinder 5, and the right arm cylinder 4 extend, the oil in the small chamber 8 of the lifting cylinder 2 flows back to the liquid tank 3 through the first port and the oil return port. The oil in the small chamber 8 of the left arm cylinder 5 and the small chamber 8 of the right arm cylinder 4 flows back to the liquid tank 3 through the second flow regulating valve 612, the first port, and the oil return port. After the lifting cylinder 2, left arm cylinder 5, and right arm cylinder 4 have extended to their designated positions, switch the reversing valve assembly 1 to the closed position. The lifting cylinder 2, left arm cylinder 5, and right arm cylinder 4 will then remain in the holding position. This is the transport state; the entire machine is raised, and the seeder's overall mechanism is in a retracted state, minimizing its size for easy storage and transport.

[0080] Step 3: As Figure 3 As shown, when the reversing valve assembly 1 is switched to the second state, the oil supply port is connected to the first port, and the oil return port is connected to the second port. The pressurized oil is output from the oil outlet and divided into two branches. One branch leads to the small chamber 8 of the lifting cylinder 2, causing the whole machine to descend and enter the working state. The other branch leads to the first hydraulic control component 61 of the main control valve assembly, and after passing through the second flow valve, it reaches the small chamber 8 of the left arm cylinder 5 and the small chamber 8 of the right arm cylinder 4. At this time, the main valve core 621 is in the first position, and the return oil from the large chamber 7 of the left arm cylinder 5 cannot flow from the first hole 631 to the second annular groove 6212 and back to the liquid tank 3. The left arm cylinder 5 remains stationary. After passing through the second hole 632 and the first flow regulating valve 622, the large chamber 7 of the left arm cylinder 5 flows from the third port 633 to the reversing valve assembly 1, and then returns to the liquid tank 3. After the lifting cylinder 2 and the right arm cylinder 4 have reached their positions, switch the reversing valve assembly 1 to the closed position. The lifting cylinder 2, the left arm cylinder 5, and the right arm cylinder 4 are all in the holding position. This is the working state. The entire machine is lowered and the right arm cylinder 4 is also lowered. The left arm cylinder 5 is in the extended position. Each part can be kept in this state for operation.

[0081] Step 4: As Figure 4As shown, at this time, the reversing valve assembly 1 switches to the first state, and the pressurized oil output from the oil supply port is divided into two branches; one branch leads to the large chamber 7 of the lifting cylinder 2, causing the entire machine to rise; the other branch leads to the third port 633 of the main control valve assembly, and after passing through the first flow valve, reaches the main valve core 621. Since the left arm cylinder 5 is already in the rising position, the right arm cylinder 4 extends. At this time, the oil in the third annular groove 6213 is output to the second hole 632. Under the action of the second throttle hole 6217, the pressure on the left side of the main valve core 621 is higher than that on the right side, and the main valve core 621 switches from the first position to the second position. After the pressurized oil passes through the main valve core 621, it leads to the large chamber 7 of the right arm cylinder 4, and the right arm cylinder 4 extends outward and gradually rises. After the lifting cylinder 2 and the right arm cylinder 4 have reached their positions, the reversing valve assembly 1 is switched to the closed state, and all cylinders are in the holding state. This state is the non-operating state, and all cylinders are extended and maintain this state.

[0082] Step 5: As Figure 5 As shown, at this time, the reversing valve assembly 1 switches to the second state, and the pressure oil output from the oil supply port is divided into two branches; one branch leads to the small chamber 8 of the lifting cylinder 2, causing the whole machine to descend and enter the working state; the other branch leads to the first hydraulic control component 61 of the main control valve, and after passing through the second flow regulating valve 612, it is input to the small chamber 8 of the left arm cylinder 5 and the small chamber 8 of the right arm cylinder 4; at this time, the main valve core 621 is in the second position, and the return oil of the large chamber 7 of the right arm cylinder 4 is locked by the one-way valve structure of the built-in flow direction control component 624 in the second hole, and cannot flow back to the first chamber, so the right arm cylinder 4 remains stationary; the left arm cylinder 5 retracts, and the large chamber 7 of the left arm cylinder 5 passes through the main valve core 621 and the first flow regulating valve 623, and then from the third port to the reversing valve assembly 1, and then returns to the liquid tank 3. After the lifting cylinder 2 and the left arm cylinder 5 have reached their positions, the reversing valve assembly 1 is switched to the closed position, and the left arm cylinder 5, the right arm cylinder 4 and the lifting cylinder 2 are all in the holding state. This is the working state. When the whole machine is lowered, the left arm cylinder 5 also lowers, and the right arm cylinder 4 rises. Each of them can maintain this state to operate.

[0083] Step 6: As Figure 6 As shown, at this time, the reversing valve assembly 1 switches to the first state, and the pressurized oil output from the oil supply port is divided into two branches; one branch leads to the large chamber 7 of the lifting cylinder 2, causing the entire machine to rise; the other branch leads to the third port 633 of the main control valve, and after passing through the first flow regulating valve 623, it reaches the main valve core 621. Because the right arm cylinder 4 is already in the raised position, the left arm cylinder 5 extends, and the oil in the first annular groove flows to the first hole. Under the action of the first throttling orifice 6216, the pressure on the right side of the main valve core 621 is higher than that on the left side, and the main valve core 621 switches to the first position. After the lifting cylinder 2 and the left arm cylinder 5 have reached their positions, the reversing valve assembly 1 is switched to the closed state. This state is the non-operating state, and all cylinders are extended and maintain this state.

[0084] The process repeats from step one to step six to switch between the seeder's operating and transport modes.

[0085] The seeder of this invention includes: a composite control hydraulic system for the seeder, a ground wheel, a left marking device and a right marking device. The composite control hydraulic system for the seeder is the same as described above. The ground wheel is connected to the lifting cylinder 2. The left marking device is connected to the left arm cylinder 5, and the right marking device is connected to the right arm cylinder 4.

[0086] The seeder in the embodiment of the present invention adopts the above-mentioned composite hydraulic control system for seeders to realize the control functions of the seeder's functional modules, so as to save sowing time and improve sowing operation efficiency.

[0087] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0088] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0089] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0090] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0091] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0092] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A composite control hydraulic system for a seeder, characterized in that, include: A reversing valve assembly includes a first port, a second port, an oil supply port, and an oil return port. The oil supply port is connected to the outlet of a fluid supply assembly, and the oil return port is connected to the tractor's fluid tank. The reversing valve assembly has a first state and a second state. In the first state, the oil supply port is connected to the second port, and the oil return port is connected to the first port. In the second state, the oil supply port is connected to the first port, and the oil return port is connected to the second port. A lifting cylinder, one end of which is connected to the second port and the other end of which is connected to the first port; The system includes a left arm cylinder, a right arm cylinder, and a main control valve assembly. The main control valve assembly includes a cylinder body, a first hydraulic control component, and a second hydraulic control component disposed within the cylinder body. The cylinder body includes a third port, one end of which is connected to the second port, and the other end of which is connected to the first end of the second hydraulic control component. The second end of the second hydraulic control component is connected to one end of the left arm cylinder, and the third end of the second hydraulic control component is connected to one end of the right arm cylinder. One end of the first hydraulic control component is connected to the first port, and the other end of the first hydraulic control component is connected to the other ends of the left arm cylinder and the right arm cylinder, respectively. The second hydraulic control component has a third state and a fourth state. In the third state, the first end of the second hydraulic control component outputs fluid unidirectionally to the left arm cylinder, and the second end of the second hydraulic control component is connected to the right arm cylinder. In the fourth state, the first end of the second hydraulic control component is connected to the left arm cylinder, and the second end of the second hydraulic control component outputs liquid unidirectionally to the right arm cylinder.

2. The composite control hydraulic system for a seeder according to claim 1, characterized in that, The left arm cylinder, right arm cylinder, and lifting cylinder all include a cylinder body and a piston rod. One end of the piston rod is located inside the cylinder body to divide the hydraulic chamber of the cylinder body into a small chamber and a large chamber, and the other end of the piston rod extends out of the cylinder body. The large cavity of the lifting cylinder is connected to the second port, and the small cavity of the lifting cylinder is connected to the first port; The second hydraulic control component is connected to the large chambers of the left and right arm cylinders respectively, and the first hydraulic control component is connected to the small chambers of the left and right arm cylinders respectively.

3. The composite control hydraulic system for a seeder according to claim 1, characterized in that, The second hydraulic control component includes a main valve core, a flow direction control component, a first check valve, and a first flow regulating valve. The cylinder body has a first chamber, a first orifice, a second orifice, and a first flow path. The main valve core is movably disposed within the first cavity in the cylinder width direction, and the outer peripheral surface of the main valve core is in contact with the inner wall of the first cavity. The main valve core has a first annular groove, a second annular groove, and a third annular groove arranged sequentially and at intervals in the cylinder width direction. The main valve core has a first throttling orifice and a second throttling orifice. The first throttling orifice connects the first annular groove and the second annular groove, and the second throttling orifice connects the second annular groove and the third annular groove. One end of the first flow path communicates with the second annular groove, and the other end of the first flow path is connected to the first check valve and the first flow regulating valve, respectively. The main valve core has a first pilot flow path communicating with the first annular groove and a second pilot flow path communicating with the third annular groove at both ends in the cylinder width direction. Both the first pilot flow path and the second pilot flow path are connected to the first cavity. Both the first and second holes are equipped with flow direction control components. The main valve core moves in the width direction of the cylinder body to change the opening state of the flow direction control components in the first or second hole. The main valve core has a first position and a second position. In the first position, the flow direction control component of the first orifice is opened to allow the liquid in the first annular groove to flow unidirectionally towards the first orifice. The flow direction control component of the second orifice is opened to allow the third annular groove to communicate with the second orifice. In the second position, the flow direction control component of the first hole is closed to connect the first hole and the first annular groove, and the flow direction control component of the second hole is opened to allow the liquid in the third annular groove to flow unidirectionally to the second hole.

4. The composite control hydraulic system for a seeder according to claim 3, characterized in that, The flow control component includes a slider, an elastic element, a valve ball, and a hollow component. Both the first and second holes include a mounting section and a connecting section connected sequentially. The radial dimension of the connecting section is smaller than the radial dimension of the mounting section. The hollow component has a through hole, one end of the elastic element is disposed within the through hole, and the other end of the elastic element abuts against the valve ball. The radial dimension of the valve ball is larger than the radial dimension of the connecting section, and the sliding ball is at least partially disposed within the connecting section. The main valve core moves in the width direction of the cylinder body to move the slider in the height direction of the cylinder body, so that the end of the valve ball away from the elastic element is suitable for opening or closing the connection section.

5. The composite control hydraulic system for a seeder according to claim 3, characterized in that, The first annular groove has a radial dimension that gradually increases in the direction away from the first hole, and the third annular groove has a radial dimension that gradually increases in the direction away from the second hole.

6. The composite control hydraulic system for a seeder according to claim 3, characterized in that, It also includes a positioning component. The cylinder body has a mounting hole. One end of the positioning component is installed in the mounting hole. The positioning component includes a seal, a positioning ball, and an elastic abutment. One end of the elastic abutment is connected to the seal, and the other end of the elastic abutment is connected to the positioning ball. A conical ring is provided in the second annular groove. The conical ring is located at the center of the main valve core axial direction.

7. The composite control hydraulic system for a seeder according to claim 6, characterized in that, The conical ring first decreases and then increases along the axial direction of the main valve core.

8. The composite control hydraulic system for a seeder according to any one of claims 1-7, characterized in that, The first hydraulic control component includes a second check valve and a second flow regulating valve. One end of the second check valve is connected to the small chambers of the left and right arm cylinders, and the other end of the second check valve is connected to the first port. One end of the second flow regulating valve is connected to the small chambers of the left arm cylinder and the right arm cylinder, and the other end of the second flow regulating valve is connected to the first port.

9. The composite control hydraulic system for a seeder according to any one of claims 1-7, characterized in that, The lifting cylinders are multiple, and the multiple lifting cylinders are connected in series. The large cavity of the first lifting cylinder is connected to the second port, and the small cavities of each subsequent lifting cylinder are connected to the large cavity of the next lifting cylinder in turn. The small cavity of the last cylinder is connected to the first port.

10. A seeder, characterized in that, include: A composite control hydraulic system for a seeder, wherein the composite control hydraulic system for a seeder is the composite control hydraulic system for a seeder as described in any one of claims 1-9; A ground wheel, which is connected to the lifting cylinder; A left and a right marking device are provided, wherein the left marking device is connected to the left arm cylinder and the right marking device is connected to the right arm cylinder.

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