A hydraulic control system and control method for a turnover plough

Abstract

The present application relates to the technical field of hydraulic control of turnover plough, and particularly relates to a hydraulic control system and control method of turnover plough, the structure of the hydraulic control system of turnover plough comprises a main control valve, a main valve connected to the main control valve, an end of the main valve being provided with a throttle, a first reversing valve connected to the main valve, a second reversing valve connected to the main valve, an amplitude modulation oil cylinder, a large cavity of the amplitude modulation oil cylinder being connected to the second reversing valve, a small cavity of the amplitude modulation oil cylinder being connected to the first reversing valve, a turnover oil cylinder, a large cavity of the turnover oil cylinder being connected to the first reversing valve, a small cavity of the turnover oil cylinder being connected to the second reversing valve, and a pilot valve connected to the throttle of the main valve, the amplitude modulation oil cylinder and the turnover oil cylinder can be locked with each other, and the amplitude modulation oil cylinder and the turnover oil cylinder act in turn. The hydraulic control system and control method of turnover plough can solve the problem that the existing turnover plough is relatively complicated to operate.

Description

Technical Field

[0001] This application relates to the field of hydraulic control technology for reversible plows, and in particular to a hydraulic control system and control method for reversible plows. Background Technology

[0002] As farmland is increasingly used for large-scale planting, farmers have higher and higher requirements for the efficiency and precision of operations such as tilling, sowing, and fertilizing. How to achieve efficient and precise farmland operations has become an urgent technical problem to be solved.

[0003] Currently, most reversible plows on the market suffer from cumbersome operation. To flip the plow from one side to the other, the operator needs to manipulate the hydraulic system multiple times. This reduces the efficiency of tilling, as the reversible plow cannot be easily attached and moved, hindering efficient tilling and planting during peak farming seasons. Summary of the Invention

[0004] In view of this, the purpose of this application is to provide a hydraulic control system and control method for a reversible plow, so as to solve the problem that the operation of existing reversible plows is relatively cumbersome.

[0005] According to a first aspect of the present invention, a hydraulic control system for a reversible plow is provided, wherein the hydraulic control system includes: a main control valve; a main valve connected to the main control valve, the end of the main valve being provided with a throttle port; a first directional valve connected to the main valve; a second directional valve connected to the main valve; an amplitude-adjusting cylinder, the large chamber of the amplitude-adjusting cylinder being connected to the second directional valve, and the small chamber of the amplitude-adjusting cylinder being connected to the first directional valve; a reversing cylinder, the large chamber of the reversing cylinder being connected to the first directional valve, and the small chamber of the reversing cylinder being connected to the second directional valve; and a pilot valve connected to the throttle port of the main valve; the amplitude-adjusting cylinder and the reversing cylinder are interlocked, the amplitude-adjusting cylinder and the reversing cylinder operate sequentially, when the amplitude-adjusting cylinder extends to its limit position and the reversing cylinder retracts to its limit position, the pilot valve switches from a second position to a first position, and causes the main valve to switch from the first position to the second position.

[0006] Preferably, when the first reversing valve is in the first position, the first reversing valve is connected to the small chamber of the amplitude regulating cylinder and the large chamber of the tilting cylinder; when the first reversing valve is in the second position, the first reversing valve is connected to the small chamber of the amplitude regulating cylinder; the first reversing valve is provided with a first spring, and under the drive of the first spring, the first reversing valve has a tendency to switch to the first position; the first reversing valve is provided with a throttle orifice, and the throttle orifice is connected to the small chamber of the amplitude regulating cylinder; when the amplitude regulating cylinder returns oil, the first reversing valve switches from the first position to the second position. When the second directional valve is in the first position, it is connected to the large chamber of the amplitude regulating cylinder and the small chamber of the tilting cylinder; when the second directional valve is in the second position, it is connected to the small chamber of the tilting cylinder; the second directional valve is provided with a second spring, which, driven by the second spring, tends to switch to the first position; the second directional valve is provided with a throttle orifice connected to the small chamber of the tilting cylinder; when the tilting cylinder returns oil, the second directional valve switches from the first position to the second position.

[0007] Preferably, the hydraulic control system of the reversible plow further includes: a first hydraulic lock disposed between the large chamber of the reversible cylinder and the first directional valve, the first hydraulic lock being connected to the main valve, and the first hydraulic lock being opened when the main valve is in a first position; a second hydraulic lock disposed between the small chamber of the reversible cylinder and the second directional valve, the second hydraulic lock being connected to the main valve, and the second hydraulic lock being opened when the main valve is in a second position; a first one-way throttle valve disposed between the first hydraulic lock and the large chamber of the reversible cylinder; and a second one-way throttle valve disposed between the second hydraulic lock and the small chamber of the reversible cylinder.

[0008] Preferably, when the main valve is in the first position, the second directional valve, the first hydraulic lock, and the pilot valve are connected to the oil supply circuit of the main valve, and the first directional valve is connected to the oil return circuit of the main valve; when the main valve is in the second position, the first directional valve and the second hydraulic lock are connected to the oil supply circuit of the main valve, and the second directional valve is connected to the oil return circuit of the main valve; the main valve is provided with a third spring, and under the drive of the third spring, the main valve has a tendency to switch to the first position; when the main valve is in the second position, the throttling of the main valve... The pilot valve is connected to the oil supply circuit of the main valve, forcing the main valve to remain in the second position. When the pilot valve is in the second position, no hydraulic oil flows inside it. When the pilot valve is in the first position, hydraulic oil can flow through the pilot valve to the throttle port of the main valve, causing the main valve to switch from the first position to the second position. The pilot valve is equipped with a fourth spring, which, driven by the fourth spring, tends to switch to the second position. The pilot valve is equipped with a throttle port, which is connected to the oil supply circuit of the main valve when the main valve is in the first position.

[0009] According to a second aspect of the present invention, a control method for a hydraulic control system of a reversible plow is provided, wherein the hydraulic control system of the reversible plow is as described above, and the control method of the hydraulic control system of the reversible plow includes: the initial state of the amplitude-adjusting cylinder is a retracted state, the initial state of the reversing cylinder is an extended state, the main control valve is opened, then the amplitude-adjusting cylinder extends to its limit position, then the reversing cylinder retracts to its limit position, then the main valve is switched from a first position to a second position, then the reversing cylinder extends to its limit position, then the amplitude-adjusting cylinder retracts to its limit position, and finally the main control valve is closed.

[0010] Preferably, after the main control valve is opened, hydraulic oil flows from the main control valve to the main valve. At this time, the main valve is in the first position. After passing through the main valve, the hydraulic oil is divided into three paths. The first path flows to the pilot valve, which is in the second position and not activated. The second path flows to the first hydraulic lock, causing the first hydraulic lock to open. The third path flows to the second directional valve, which is in the first position. After passing through the second directional valve, the hydraulic oil flows to the large chamber of the amplitude regulating cylinder, forcing the amplitude regulating cylinder to extend. The return oil from the amplitude regulating cylinder flows to the throttle port of the first directional valve, forcing the first directional valve to switch from the first position to the second position. Then, the return oil flows to the main valve and finally back to the main control valve. When the first directional valve switches to the second position, the oil passage of the large chamber of the tilting cylinder is closed. In this state, the amplitude regulating cylinder extends to its limit position, and the tilting cylinder is in the closed state.

[0011] Preferably, when the amplitude-adjusting cylinder extends to its limit position, the pressure in the small chamber of the amplitude-adjusting cylinder decreases, and the first directional valve switches from the second position to the first position under the action of the spring force. After passing through the second directional valve, the hydraulic oil flows through the second hydraulic lock and the second one-way throttle valve to the small chamber of the tilting cylinder, forcing the tilting cylinder to retract. The return oil from the tilting cylinder passes through the first one-way throttle valve and the first hydraulic lock to reach the first directional valve in the first position, and then flows to the main valve, and finally to the main control valve. When the return oil passes through the first one-way throttle valve, the small chamber of the tilting cylinder generates pressure and acts on the throttle port of the second directional valve, forcing the second directional valve to switch from the first position to the second position. The oil passage of the large chamber of the amplitude-adjusting cylinder is closed. In this state, the tilting cylinder retracts to its limit position, and the amplitude-adjusting cylinder is in the closed state.

[0012] Preferably, when the tilting cylinder retracts to its limit position, the pressure in the hydraulic control system of the tilting plow rises to its highest state. Under the action of the pressure, the pilot valve switches from the second position to the first position. After passing through the pilot valve in the first position, the hydraulic oil acts on the throttle orifice of the main valve, forcing the main valve to switch from the first position to the second position. Subsequently, the control hydraulic oil of the pilot valve returns through the main valve in the second position, causing the pilot valve to switch from the first position to the second position under the action of the spring force.

[0013] Preferably, when the main valve switches from the first position to the second position, the hydraulic oil is divided into three paths after passing through the main valve. The first path of hydraulic oil flows to the second hydraulic lock, causing the second hydraulic lock to open. The second path of hydraulic oil flows to the throttle port of the main valve, forcing the main valve to remain in the second position. The third path of hydraulic oil flows to the first directional valve in the first position. After passing through the first directional valve, the hydraulic oil passes through the first hydraulic lock and the first one-way throttle valve, and finally flows to the large chamber of the tilting cylinder, forcing the tilting cylinder to extend. The return oil from the small chamber of the tilting cylinder flows to the main valve after passing through the second one-way throttle valve, the second hydraulic lock, and the second directional valve, and finally flows to the main control valve. When the return oil passes through the second directional valve, the small chamber of the tilting cylinder generates pressure and acts on the throttle port of the second directional valve, forcing the second directional valve to switch from the first position to the second position. The oil passage of the large chamber of the amplitude regulating cylinder is closed. In this state, the tilting cylinder extends to its limit position, and the amplitude regulating cylinder is in the closed state.

[0014] Preferably, when the tilting cylinder extends to its limit position, the pressure in the small chamber of the tilting cylinder decreases, and the second directional valve switches from the second position to the first position under the action of the spring force. The hydraulic oil reaches the small chamber of the amplitude regulating cylinder after passing through the first directional valve in the first position. The return oil from the large chamber of the amplitude regulating cylinder flows to the main valve through the second directional valve in the first position, and finally flows to the main control valve. When the main valve is in the second position, the first hydraulic lock is in the closed state, the oil passage of the large chamber of the tilting cylinder is closed, and in this state, the amplitude regulating cylinder retracts to its limit position, and the tilting cylinder is in the closed state.

[0015] The hydraulic control system and method for the reversible plow of this invention feature an interlocking system between the amplitude-adjusting cylinder and the reversing cylinder, allowing them to operate sequentially. When the operator opens the main control valve, the amplitude-adjusting cylinder extends to its limit position, then the reversing cylinder retracts to its limit position. The main valve then switches from a first position to a second position, and the reversing cylinder extends to its limit position again, followed by the amplitude-adjusting cylinder retracting to its limit position. Finally, the operator closes the main control valve, thus enabling the reversible plow to flip from one side to the other. The entire process requires no cumbersome operation from the operator; only signals to open and close the main control valve are needed. The reversible plow's movements are smooth and continuous, significantly improving tillage efficiency. This effectively solves the problem of the cumbersome operation of existing reversible plows.

[0016] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the hydraulic control system for the reversible plow according to the present invention.

[0019] Figure 2 This is a schematic diagram of the extended state of the amplitude-adjusting cylinder in the hydraulic control system of the reversible plow according to the present invention.

[0020] Figure 3 This is a schematic diagram of the retracted state of the tilting cylinder in the hydraulic control system of the tilting plow according to the present invention.

[0021] Figure 4This is a schematic diagram of the main valve switching of the hydraulic control system for the reversible plow according to the present invention.

[0022] Figure 5 This is a schematic diagram of the extended state of the tilting cylinder in the hydraulic control system of the tilting plow according to the present invention.

[0023] Figure 6 This is a schematic diagram of the retracted state of the amplitude regulating cylinder of the hydraulic control system of the reversible plow according to the present invention.

[0024] Figure 7 This is a schematic diagram of the main control valve being closed in the hydraulic control system of the reversible plow according to the present invention.

[0025] Reference numerals in the attached diagram: 1-Main control valve; 2-Main valve; 3-Pilot valve; 4-First directional valve; 5-Second directional valve; 6-Second hydraulic lock; 7-Second one-way throttle valve; 8-First hydraulic lock; 9-First one-way throttle valve; 10-Amplitude adjustment cylinder; 11-Tilting cylinder. Detailed Implementation

[0026] The following detailed embodiments are provided to help the reader gain a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will be apparent after understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein; changes that will be apparent after understanding the disclosure of this application are possible, except for operations that must occur in a specific order. Furthermore, for clarity and brevity, descriptions of features known in the art may be omitted.

[0027] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0028] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, it may be directly "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, or there may be one or more other elements in between. In contrast, when an element is described as being "directly on" another element, "directly connected to" another element, "directly bonded to" another element, "directly on" another element, or "directly covering" another element, there may be no other elements in between.

[0029] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0030] Although terms such as “first,” “second,” and “third” may be used herein to describe individual components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts are not limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Therefore, without departing from the teachings of the examples described herein, the first component, assembly, region, layer, or part referred to as the second component, assembly, region, layer, or part may also be referred to as the second component, assembly, region, layer, or part.

[0031] For ease of description, spatial relation terms such as “above,” “upper,” “below,” and “lower” are used herein to describe the relationship between one element and another, as shown in the accompanying drawings. Such spatial relation terms are intended to include not only the orientation depicted in the drawings but also different orientations of the device during use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “upper” relative to another element will subsequently be “below” or “lower” relative to that other element. Therefore, the term “above” includes both “above” and “below” orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relation terms used herein will be interpreted accordingly.

[0032] The terminology used herein is for the purpose of describing various examples only and is not intended to limit the examples. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms “comprising,” “including,” and “having” enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0033] Variations in the shapes shown in the accompanying drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the accompanying drawings, but include changes in shape that may occur during manufacturing.

[0034] The features of the examples described herein can be combined in various ways that will be apparent upon understanding the disclosure of this application. Furthermore, although the examples described herein have a wide variety of constructions, other constructions are possible, as will be apparent upon understanding the disclosure of this application.

[0035] like Figures 1 to 7 As shown, according to a first aspect of the present invention, a hydraulic control system for a reversible plow is provided, the hydraulic control system for a reversible plow includes a main control valve 1, a main valve 2, a first directional valve 4, a second directional valve 5, an amplitude regulating cylinder 10, a reversing cylinder 11, and a pilot valve 3.

[0036] In the following description, reference will be made to Figures 1 to 7 The specific structure of the aforementioned components of the hydraulic control system for the reversible plow and their connection relationships are described in detail.

[0037] like Figure 1As shown, in this embodiment, the main valve 2 is connected to the main control valve 1. The main control valve 1 can be a tractor main control valve. When the operator opens the main control valve 1, it supplies oil to the main valve 2. The end of the main valve 2 can be provided with a throttle port for driving the main valve 2 to switch directions. The first reversing valve 4 and the second reversing valve 5 can be connected to the main valve 2 via oil circuits. The large chamber of the amplitude-adjusting cylinder 10 can be connected to the second reversing valve 5, and the small chamber of the amplitude-adjusting cylinder 10 can be connected to the first reversing valve 4. The large chamber of the tilting cylinder 11 can be connected to the first reversing valve 4, and the small chamber of the tilting cylinder 11 can be connected to the second reversing valve 5. The pilot valve 3 can be connected to the throttle port of the main valve 2. The amplitude-adjusting cylinder 10 and the tilting cylinder 11 can be interlocked, allowing them to operate sequentially. When the amplitude-adjusting cylinder 10 extends to its limit position and the tilting cylinder 11 retracts to its limit position, the pilot valve 3 can switch from the second position to the first position, and the main valve 2 can switch from the first position to the second position. Thereafter, the main valve 2 will remain in the second position to ensure that the amplitude-adjusting cylinder 10 and the tilting cylinder 11 can enable the tilting plow to complete the full tilting action.

[0038] Preferred, such as Figure 1 As shown, in the embodiment, the first position is when the main valve 2, the first directional valve 4, the second directional valve 5, and the pilot valve 3 are in the left position; the second position is when the main valve 2, the first directional valve 4, the second directional valve 5, and the pilot valve 3 are in the right position.

[0039] Preferred, such as Figure 1 As shown, in this embodiment, when the first directional valve 4 is in the first position, it is connected to the small chamber of the amplitude-regulating cylinder 10 and the large chamber of the tilting cylinder 11 via an oil circuit. When the first directional valve 4 is in the second position, it is only connected to the small chamber of the amplitude-regulating cylinder 10. The first directional valve 4 may be equipped with a first spring. Driven by the first spring, the first directional valve 4 tends to switch to the first position. The first directional valve 4 may also be equipped with a throttle orifice, which is connected to the small chamber of the amplitude-regulating cylinder 10. When the amplitude-regulating cylinder 10 returns oil, the first directional valve 4 can switch from the first position to the second position under pressure.

[0040] Preferred, such as Figure 1As shown, in this embodiment, when the second directional valve 5 is in the first position, it is connected to the large chamber of the amplitude regulating cylinder 10 and the small chamber of the tilting cylinder 11 via an oil circuit. When the second directional valve 5 is in the second position, it is only connected to the small chamber of the tilting cylinder 11. The second directional valve 5 may be equipped with a second spring, which, driven by the spring, tends to switch to the first position. The second directional valve 5 may also be equipped with a throttle orifice connected to the small chamber of the tilting cylinder 11. When the tilting cylinder 11 returns oil, the second directional valve 5 can switch from the first position to the second position under pressure.

[0041] Preferred, such as Figure 1 As shown, in this embodiment, the hydraulic control system of the reversible plow may further include a first hydraulic lock 8, a second hydraulic lock 6, a first one-way throttle valve 9, and a second one-way throttle valve 7. The first hydraulic lock 8 may be disposed between the large chamber of the reversing cylinder 11 and the first directional valve 4. The first hydraulic lock 8 can be connected to the main valve 2 via an oil circuit. When the main valve 2 is in the first position, the first hydraulic lock 8 is open. The second hydraulic lock 6 may be disposed between the small chamber of the reversing cylinder 11 and the second directional valve 5. The second hydraulic lock 6 can be connected to the main valve 2 via an oil circuit. When the main valve 2 is in the second position, the second hydraulic lock 6 is open. The first one-way throttle valve 9 may be disposed between the first hydraulic lock 8 and the large chamber of the reversing cylinder 11. The second one-way throttle valve 7 may be disposed between the second hydraulic lock 6 and the small chamber of the reversing cylinder 11.

[0042] Preferred, such as Figure 1 As shown in the embodiment, when the main valve 2 is in the first position, the second directional valve 5, the first hydraulic lock 8, and the pilot valve 3 can be connected to the oil supply circuit of the main valve 2, and the first directional valve 4 can be connected to the oil return circuit of the main valve 2. When the main valve 2 is in the second position, the first directional valve 4 and the second hydraulic lock 6 can be connected to the oil supply circuit of the main valve 2, and the second directional valve 5 can be connected to the oil return circuit of the main valve 2.

[0043] Preferred, such as Figure 1 As shown, in this embodiment, the main valve 2 may be equipped with a third spring. Driven by the third spring, the main valve 2 tends to switch to a first position. When the main valve 2 is in the second position, its throttle port can be connected to the oil supply circuit, thereby forcing the main valve 2 to remain in the second position. When the main control valve 1 stops supplying oil, the main valve 2 can switch from the second position to the first position under the drive of the third spring.

[0044] Preferred, such as Figure 1As shown, in this embodiment, when the pilot valve 3 is in the second position, no hydraulic oil flows through it (i.e., the oil passage is blocked). When the pilot valve 3 is in the first position, hydraulic oil can flow through the pilot valve 3 to the throttle port of the main valve 2, causing the main valve 2 to switch from the first position to the second position. The pilot valve 3 may be equipped with a fourth spring. Driven by the fourth spring, the pilot valve 3 has a tendency to switch to the second position. The pilot valve 3 is also equipped with a throttle port, which is connected to the oil supply passage of the main valve 2 when the main valve 2 is in the first position. When the main valve 2 is in the second position, the hydraulic oil can force the pilot valve 3 to remain in the second position.

[0045] During use, the hydraulic control system of the reversible plow enables the amplitude adjustment cylinder 10 and the reversing cylinder 11 to operate sequentially. The operator only needs to provide signals to open and close the main control valve 1 to flip the reversible plow from one side to the other. The main control valve 1 can be manually or electro-hydraulic controlled for remote operation, offering convenience and speed.

[0046] In addition, such as Figures 2 to 7 As shown, according to a second aspect of the present invention, a control method for a hydraulic control system of a reversible plow is provided. The hydraulic control system is as described above. The control method includes: setting the initial state of the amplitude-adjusting cylinder 10 to a retracted state and the initial state of the reversible cylinder 11 to an extended state. In this state, the main control valve 1 is opened, and then the amplitude-adjusting cylinder 10 extends to its limit position; then the reversible cylinder 11 retracts to its limit position; then the main valve 2 switches from a first position to a second position; then the reversible cylinder 11 extends to its limit position; then the amplitude-adjusting cylinder 10 retracts to its limit position; finally, the main control valve 1 is closed. This enables a cycle, and after the entire operation is completed, the amplitude-adjusting cylinder 10, the reversible cylinder 11, and each hydraulic valve return to their initial state.

[0047] Specifically, such as Figure 2As shown, in this embodiment, after the main control valve 1 is opened, hydraulic oil flows from the main control valve 1 to the main valve 2, which is in the first position. The hydraulic oil then splits into three paths after passing through the main valve 2. The first path flows to the pilot valve 3, which is in the second position and not activated (the oil pressure is insufficient to drive the pilot valve 3 to switch). The second path flows to the first hydraulic lock 8, opening it. The third path flows to the second directional valve 5, which is in the first position. After passing through the second directional valve 5, the hydraulic oil flows to the large chamber of the amplitude regulating cylinder 10, forcing it to extend. The return oil from the amplitude regulating cylinder 10 flows to the throttle port of the first directional valve 4, forcing it to switch from the first position to the second position. Then, the return oil flows to the main valve 2, and finally back to the main control valve 1. When the first directional valve 4 switches to the second position, the oil passage to the large chamber of the tilting cylinder 11 is closed. In this state, the amplitude adjustment cylinder 10 continues to extend until it reaches its limit position, while the tilting cylinder 11 is in the closed state (i.e., the tilting cylinder 11 remains in the extended state).

[0048] Preferred, such as Figure 3 As shown, in this embodiment, when the amplitude-regulating cylinder 10 extends to its limit position, the pressure in the small chamber of the amplitude-regulating cylinder 10 decreases, and the first directional valve 4 switches from the second position to the first position under the action of the spring force. The hydraulic oil flowing out of the main valve 2 passes through the second directional valve 5, then through the second hydraulic lock 6 and the second one-way throttle valve 7 to the small chamber of the tilting cylinder 11, forcing the tilting cylinder 11 to retract. The return oil from the tilting cylinder 11 passes through the first one-way throttle valve 9 and the first hydraulic lock 8 to reach the first directional valve 4 in the first position. Then, the return oil flows to the main valve 2, and finally to the main control valve 1. When the return oil passes through the first one-way throttle valve 9, a large pressure is generated in the small chamber of the tilting cylinder 11, which acts on the throttle port of the second directional valve 5, forcing the second directional valve 5 to switch from the first position to the second position. At this time, the oil passage of the large chamber of the amplitude-regulating cylinder 10 is closed. In this state, the tilting cylinder 11 continues to retract until it reaches its limit position, and the amplitude adjustment cylinder 10 is in the closed state (i.e., the amplitude adjustment cylinder 10 remains in the extended state).

[0049] Preferred, such as Figure 4As shown in the embodiment, when the tilting cylinder 11 retracts to its limit position, the oil pressure in the tilting plow hydraulic control system rises to its highest level. At this time, the pilot valve 3 can switch from the second position to the first position under the action of oil pressure. After passing through the pilot valve 3 in the first position, the hydraulic oil acts on the throttle orifice of the main valve 2, forcing the main valve 2 to switch from the first position to the second position. Subsequently, the control hydraulic oil of the pilot valve 3 returns through the main valve 2 in the second position, causing the pilot valve 3 to switch from the first position to the second position under the action of spring force. At the same time, one of the hydraulic oil streams from the main valve 2 in the second position can flow to the throttle orifice of the main valve 2, thereby forcing the main valve 2 to remain in the second position.

[0050] Preferred, such as Figure 5 As shown in the embodiment, when the main valve 2 switches from the first position to the second position, the hydraulic oil is divided into three paths after passing through the main valve 2. The first path of hydraulic oil flows to the second hydraulic lock 6, causing the second hydraulic lock 6 to open. The second path of hydraulic oil flows to the throttle port of the main valve 2, forcing the main valve 2 to remain in the second position. The third path of hydraulic oil flows to the first directional valve 4, which is in the first position. After passing through the first directional valve 4, the hydraulic oil passes through the first hydraulic lock 8 and the first one-way throttle valve 9, and finally flows to the large chamber of the tilting cylinder 11, forcing the tilting cylinder 11 to extend. The return oil from the small chamber of the tilting cylinder 11 flows to the main valve 2 after passing through the second one-way throttle valve 7, the second hydraulic lock 6, and the second directional valve 5, and finally flows to the main control valve 1. When the return oil passes through the second directional valve 5, the small chamber of the tilting cylinder 11 will generate a large pressure and act on the throttle port of the second directional valve 5, forcing the second directional valve 5 to switch from the first position to the second position. At this time, the oil circuit of the large chamber of the amplitude regulating cylinder 10 is closed. In this state, the tilting cylinder 11 continues to extend until it reaches its limit position, while the amplitude adjustment cylinder 10 is in the closed state (i.e., the amplitude adjustment cylinder 10 remains in the extended state).

[0051] Preferred, such as Figure 6 As shown, in this embodiment, when the tilting cylinder 11 extends to its limit position, the pressure in the small chamber of the tilting cylinder 11 decreases, and the second directional valve 5 switches from the second position to the first position under the action of the spring force. The hydraulic oil flowing out of the main valve 2 reaches the small chamber of the amplitude regulating cylinder 10 after passing through the first directional valve 4 in the first position. The return oil from the large chamber of the amplitude regulating cylinder 10 flows to the main valve 2 through the second directional valve 5 in the first position, and finally flows to the main control valve 1. When the main valve 2 is in the second position, the first hydraulic lock 8 is in the closed state, and the oil passage of the large chamber of the tilting cylinder 11 is closed. In this state, the amplitude regulating cylinder 10 continues to retract until it retracts to its limit position, and the tilting cylinder 11 is in the closed state (i.e., the tilting cylinder 11 remains in the extended state).

[0052] Preferred, such as Figure 7As shown, in this embodiment, when the amplitude-adjusting cylinder 10 retracts to its limit position, the operator closes the main control valve 1, stopping the supply of oil to the main valve 2. Subsequently, the main valve 2 returns to its first position under the action of the spring force. At this time, the amplitude-adjusting cylinder 10 and the tilting cylinder 11 are also in their initial positions.

[0053] During operation, when the operator opens the main control valve 1, the amplitude adjustment cylinder 10 extends to its limit position, then the tilting cylinder 11 retracts to its limit position. The main valve 2 then switches from its first position to its second position, the tilting cylinder 11 extends to its limit position again, and the amplitude adjustment cylinder 10 retracts to its limit position. Finally, the operator closes the main control valve 1, thus allowing the reversible plow to flip from one side to the other. The entire process requires no cumbersome operation from the operator; only signals to open and close the main control valve 1 are needed. The reversible plow's movements are smooth and continuous, greatly improving the efficiency of tillage.

[0054] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The protection scope of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the protection scope of this application. Therefore, the protection scope of this application should be determined by the protection scope of the claims.

Claims

1. A hydraulic control system for a reversible plow, characterized in that, The hydraulic control system of the reversible plow includes: Main control valve; A main valve, connected to the main control valve, has a throttling orifice at its end; The first directional valve is connected to the main valve; The second directional valve is connected to the main valve; An amplitude-adjusting cylinder, wherein the large chamber of the amplitude-adjusting cylinder is connected to the second directional valve, and the small chamber of the amplitude-adjusting cylinder is connected to the first directional valve; A tilting cylinder, wherein the large chamber of the tilting cylinder is connected to the first directional control valve, and the small chamber of the tilting cylinder is connected to the second directional control valve; and A pilot valve is connected to the throttle port of the main valve; The amplitude-adjusting cylinder and the tilting cylinder can be locked to each other. The amplitude-adjusting cylinder and the tilting cylinder operate sequentially. When the amplitude-adjusting cylinder extends to its limit position and the tilting cylinder retracts to its limit position, the pilot valve switches from the second position to the first position, and the main valve switches from the first position to the second position. The hydraulic control system of the reversible plow also includes: A first hydraulic lock is disposed between the large cavity of the tilting cylinder and the first directional valve. The first hydraulic lock is connected to the main valve. When the main valve is in the first position, the first hydraulic lock is opened. The second hydraulic lock is disposed between the small cavity of the tilting cylinder and the second directional valve. The second hydraulic lock is connected to the main valve. When the main valve is in the second position, the second hydraulic lock is opened. A first one-way throttle valve is disposed between the first hydraulic lock and the large cavity of the tilting cylinder; and The second one-way throttle valve is located between the second hydraulic lock and the small cavity of the tilting cylinder.

2. The hydraulic control system for the reversible plow according to claim 1, characterized in that, When the first reversing valve is in the first position, the first reversing valve is connected to the small chamber of the amplitude regulating cylinder and the large chamber of the tilting cylinder; When the first reversing valve is in the second position, the first reversing valve is connected to the small chamber of the amplitude regulating cylinder; The first reversing valve is provided with a first spring. Under the drive of the first spring, the first reversing valve has a tendency to switch to a first position. The first reversing valve is provided with a throttle orifice, which is connected to the small cavity of the amplitude regulating cylinder. When the amplitude regulating cylinder returns oil, the first reversing valve switches from the first position to the second position. When the second reversing valve is in the first position, the second reversing valve is connected to the large chamber of the amplitude regulating cylinder and the small chamber of the tilting cylinder; When the second directional valve is in the second position, the second directional valve is connected to the small chamber of the tilting cylinder; The second directional valve is provided with a second spring. Driven by the second spring, the second directional valve tends to switch to the first position. The second directional valve is provided with a throttle orifice, which is connected to the small cavity of the tilting cylinder. When the tilting cylinder returns oil, the second directional valve switches from the first position to the second position.

3. The hydraulic control system for the reversible plow according to claim 2, characterized in that, When the main valve is in the first position, the second directional valve, the first hydraulic lock, and the pilot valve are connected to the oil supply circuit of the main valve, and the first directional valve is connected to the oil return circuit of the main valve. When the main valve is in the second position, the first directional valve and the second hydraulic lock are connected to the oil supply circuit of the main valve, and the second directional valve is connected to the oil return circuit of the main valve. The main valve is equipped with a third spring. Driven by the third spring, the main valve tends to switch to the first position. When the main valve is in the second position, the throttle port of the main valve is connected to the oil supply circuit of the main valve, forcing the main valve to remain in the second position. When the pilot valve is in the second position, no hydraulic oil flows inside it; when the pilot valve is in the first position, hydraulic oil can flow through the pilot valve to the throttle port of the main valve, causing the main valve to switch from the first position to the second position. The pilot valve is equipped with a fourth spring. Driven by the fourth spring, the pilot valve tends to switch to the second position. The pilot valve is equipped with a throttle port. When the main valve is in the first position, the throttle port is connected to the oil supply circuit of the main valve.

4. A control method for a hydraulic control system of a reversible plow, characterized in that, The hydraulic control system of the reversible plow is the hydraulic control system of the reversible plow as described in claim 3. The control method of the hydraulic control system of the reversible plow includes: the initial state of the amplitude-adjusting cylinder is the retracted state, the initial state of the reversing cylinder is the extended state, the main control valve is opened, then the amplitude-adjusting cylinder extends to the limit position, then the reversing cylinder retracts to the limit position, then the main valve is switched from the first position to the second position, then the reversing cylinder extends to the limit position, then the amplitude-adjusting cylinder retracts to the limit position, and finally the main control valve is closed.

5. The control method of the hydraulic control system for the reversible plow according to claim 4, characterized in that, After the main control valve is opened, hydraulic oil flows from the main control valve to the main valve. At this time, the main valve is in the first position. After passing through the main valve, the hydraulic oil is divided into three paths. The first path of hydraulic oil flows to the pilot valve, which is in the second position and has no action. The second path of hydraulic oil flows to the first hydraulic lock, causing the first hydraulic lock to open. The third path of hydraulic oil flows to the second directional valve, which is in the first position. After passing through the second directional valve, the hydraulic oil flows to the large chamber of the amplitude regulating cylinder, forcing the amplitude regulating cylinder to extend. The return oil from the amplitude regulating cylinder flows to the throttle port of the first directional valve, forcing the first directional valve to switch from the first position to the second position. Then, the return oil flows to the main valve, and finally, the return oil flows to the main control valve. When the first reversing valve switches to the second position, the oil circuit of the large chamber of the tilting cylinder is closed. In this state, the amplitude adjustment cylinder extends to the limit position, and the tilting cylinder is in the closed state.

6. The control method of the hydraulic control system for the reversible plow according to claim 4, characterized in that, When the amplitude regulating cylinder extends to its limit position, the pressure in the small chamber of the amplitude regulating cylinder decreases. Under the action of the spring force, the first reversing valve switches from the second position to the first position. After passing through the second reversing valve, the hydraulic oil flows through the second hydraulic lock and the second one-way throttle valve to the small chamber of the tilting cylinder, forcing the tilting cylinder to retract. The return oil from the tilting cylinder reaches the first reversing valve in the first position after passing through the first one-way throttle valve and the first hydraulic lock. Then the return oil flows to the main valve and finally to the main control valve. When the return oil passes through the first one-way throttle valve, the small chamber of the tilting cylinder generates pressure and acts on the throttle port of the second directional valve, forcing the second directional valve to switch from the first position to the second position. The oil passage of the large chamber of the amplitude regulating cylinder is closed. In this state, the tilting cylinder retracts to the limit position, and the amplitude regulating cylinder is in the closed state.

7. The control method of the hydraulic control system for the reversible plow according to claim 4, characterized in that, When the tilting cylinder retracts to its limit position, the pressure in the tilting plow hydraulic control system rises to its highest state. Under the action of the pressure, the pilot valve switches from the second position to the first position. After passing through the pilot valve in the first position, the hydraulic oil acts on the throttle orifice of the main valve, forcing the main valve to switch from the first position to the second position. Subsequently, the control hydraulic oil of the pilot valve returns through the main valve in the second position, causing the pilot valve to switch from the first position to the second position under the action of the spring force.

8. The control method of the hydraulic control system for the reversible plow according to claim 4, characterized in that, When the main valve switches from the first position to the second position, the hydraulic oil is divided into three paths after passing through the main valve. The first path of hydraulic oil flows to the second hydraulic lock, causing the second hydraulic lock to open. The second path of hydraulic oil flows to the throttle port of the main valve, forcing the main valve to remain in the second position. The third path of hydraulic oil flows to the first directional valve in the first position. After passing through the first directional valve, the hydraulic oil passes through the first hydraulic lock and the first one-way throttle valve, and finally flows to the large chamber of the tilting cylinder, forcing the tilting cylinder to extend. The return oil from the small chamber of the tilting cylinder flows to the main valve after passing through the second one-way throttle valve, the second hydraulic lock, and the second directional valve, and finally flows to the main control valve. When the return oil passes through the second directional valve, the small chamber of the tilting cylinder generates pressure and acts on the throttle port of the second directional valve, forcing the second directional valve to switch from the first position to the second position. The oil passage of the large chamber of the amplitude regulating cylinder is closed. In this state, the tilting cylinder extends to its limit position, and the amplitude regulating cylinder is in the closed state.

9. The control method of the hydraulic control system for the reversible plow according to claim 4, characterized in that, When the tilting cylinder extends to its limit position, the pressure in the small chamber of the tilting cylinder decreases, and the second directional valve switches from the second position to the first position under the action of the spring force. The hydraulic oil reaches the small chamber of the amplitude regulating cylinder after passing through the first directional valve in the first position. The return oil from the large chamber of the amplitude regulating cylinder flows to the main valve through the second directional valve in the first position, and finally flows to the main control valve. When the main valve is in the second position, the first hydraulic lock is closed, the oil passage of the large chamber of the tilting cylinder is closed, and in this state, the amplitude adjustment cylinder retracts to the limit position, and the tilting cylinder is closed.

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