Hydraulic control valve for high speed transplanter

Abstract

This utility model relates to the field of hydraulic control valve technology, and discloses a hydraulic control valve used in a high-speed rice transplanter, including a main check valve, a compound directional valve, a fixed-value throttle valve, a flow divider valve, a safety valve, a return oil check valve, and a return oil throttle valve integrated in a valve block. The valve core of the main check valve is in a normally open, upward position under the action of a spring force. The valve core of the compound directional valve is controlled to move left and right by the interaction of external operating force and spring, realizing four working states for pressurized oil to enter and exit the working cylinder: rising, slow rising, neutral holding, and falling. The P port is connected to the hydraulic pump, the T port is connected to the oil tank, and the C port is connected to the working cylinder. The return oil check valve includes the valve core of the main check valve and a spring. In this utility model, the main check valve, compound directional valve, fixed-value throttle valve, flow divider valve, safety valve, return oil check valve, and return oil throttle valve are integrated into the same valve block, resulting in a compact structure, reduced pipeline connections, and reduced leakage risk.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic control valve technology, and in particular to a hydraulic control valve used in high-speed rice transplanters. Background Technology

[0002] As a key piece of agricultural machinery in agricultural production, the high-speed rice transplanter's operating efficiency and transplanting quality are highly dependent on the stable operation of the hydraulic system. The hydraulic control valve, as the core control component of the hydraulic system, plays an important role in regulating the direction, speed, and pressure of the working cylinder, directly affecting the transplanter's lifting accuracy, operational continuity, and equipment safety. With the development of agricultural machinery towards high speed and lightweight, higher requirements are placed on the compactness of the hydraulic control valve's structure, the degree of functional integration, and the reliability of its operation.

[0003] The hydraulic control valves used in existing high-speed rice transplanters mostly adopt a decentralized combination structure, which consists of multiple independent hydraulic valves such as main check valves, reversing valves, and throttle valves connected by pipelines. This type of control valve group requires separate installation space for each valve and oil flow through external pipelines. Not only is the overall size and weight large, occupying the limited installation space of agricultural machinery, but it also has the problems of complex pipeline connections and cumbersome assembly procedures. Furthermore, the decentralized structure is prone to pressure loss due to pipeline leakage, affecting control accuracy and response speed.

[0004] Compared to existing technologies, this multi-functional valve is integrated into the same valve block. By replacing external pipelines with internal oil passages, the overall size and weight are significantly reduced. At the same time, through the multi-position control of the composite directional valve and the interlocking design of the main check valve, precise control of four working conditions—rising, slow rising, neutral holding, and falling—is achieved in a single valve block. This solves the problems of loose structure, low functional integration, and insufficient operational safety of existing decentralized valve groups. Therefore, a hydraulic control valve for high-speed rice transplanters is proposed to solve the above problems. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a hydraulic control valve for high-speed rice transplanters, aiming to improve the problems of large size, heavy weight, low control accuracy and complicated operation caused by the independent valve body combination in the existing hydraulic control valve.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] The hydraulic control valves used in high-speed rice transplanters include a main check valve, a compound directional valve, a fixed-value throttle valve, a flow divider valve, a safety valve, a return oil check valve, and a return oil throttle valve, all integrated in a single valve block.

[0008] The valve core of the main check valve is in a normally open, upward position under the action of spring force;

[0009] The valve core of the composite directional valve is controlled to move left and right by the interaction of external operating force and spring, realizing four working states of pressurized oil entering and exiting the working cylinder: rising, slow rising, neutral holding, and falling.

[0010] The P port is connected to the hydraulic pump, the T port is connected to the oil tank, and the C port is connected to the working cylinder.

[0011] The return oil check valve includes a main check valve core and a spring. One end of the valve core is connected to the spring, which is used to control the flow or closure of reverse pressure oil.

[0012] As a further description of the above technical solution:

[0013] The main check valve has two working positions: when the pressure oil flows in one direction, it corresponds to the working cylinder rising and neutral holding positions; when the pressure oil flows freely, it corresponds to the working cylinder falling positions.

[0014] As a further description of the above technical solution:

[0015] When the valve core of the composite directional valve is in the rightmost position, the pressure oil enters the working cylinder through the fixed-value throttle valve to achieve a steady upward movement. When it is in the second right position, the pressure oil enters the working cylinder through the fixed-value throttle valve, while some of the pressure oil returns to the oil tank through the diverter valve to achieve a slow upward movement.

[0016] As a further description of the above technical solution:

[0017] When the valve core of the composite directional valve is in the second position from the left, the main check valve is in a one-way shut-off state, the working cylinder remains neutral, the safety valve is in an overflow state, and the working cylinder pressure is kept stable.

[0018] As a further description of the above technical solution:

[0019] When the valve core of the composite directional valve is in the left position, the main check valve is in a free-flow state, and the oil in the working cylinder flows back to the oil tank through the return oil throttle valve, thereby lowering the cylinder. The lowering speed is adjusted by the return oil throttle valve.

[0020] As a further description of the above technical solution:

[0021] The return oil check valve opens the oil passage when the valve core compresses the spring under the action of reverse pressure oil, and closes the oil passage when there is no reverse pressure.

[0022] This utility model has the following beneficial effects:

[0023] The main check valve, compound directional valve, setpoint throttle valve, flow divider valve, safety valve, return check valve, and return throttle valve are integrated into a single valve block, resulting in a compact structure, reduced piping connections, and lower leakage risk. The compound directional valve switches between four operating states—cylinder rising, slow rising, neutral holding, and falling—through valve core position switching, providing precise control and easy operation. The setpoint throttle valve and flow divider valve work together to regulate the cylinder's rising speed, while the return throttle valve controls the falling speed, improving operational stability. The safety valve and return check valve enhance system safety, preventing pressure overload and oil backflow. Attached Figure Description

[0024] Figure 1 A three-dimensional schematic diagram of the hydraulic control valve used in the high-speed rice transplanter proposed in this utility model;

[0025] Figure 2 This is a schematic diagram of the main check valve structure of the hydraulic control valve used in the high-speed rice transplanter proposed in this utility model.

[0026] Figure 3 This is a schematic diagram of the composite directional valve structure of the hydraulic control valve used in the high-speed rice transplanter proposed in this utility model.

[0027] Legend:

[0028] 1. Main check valve; 2. Compound directional valve; 3. Fixed value throttle valve; 4. Diverter valve; 5. Safety valve; 6. Return oil check valve; 7. Return oil throttle valve. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Reference Figure 1 - Figure 3 One embodiment of this utility model provides a hydraulic control valve for a high-speed rice transplanter, including a main check valve 1, a compound directional valve 2, a fixed-value throttle valve 3, a flow divider valve 4, a safety valve 5, a return oil check valve 6, and a return oil throttle valve 7 integrated in a valve block;

[0031] The valve core of the main check valve 1 is in the normally open, upward position under the action of spring force, which is used to ensure the forward flow of hydraulic oil and prevent backflow of oil, and maintain the pressure stability when the cylinder rises.

[0032] The valve core of the compound directional valve 2 is controlled to move left and right by the interaction of external operating force and spring, realizing four working states of pressurized oil entering and exiting the working cylinder: when rising, the oil directly enters the cylinder to achieve rapid lifting; when rising slowly, the oil enters the cylinder after throttling to achieve smooth lifting; when holding in neutral position, the oil circuit is cut off to maintain the position of the cylinder; and when descending, the cylinder is allowed to return oil to achieve the descending action.

[0033] The fixed-value throttle valve 3 is used to precisely control the lifting speed of the oil cylinder; the diverter valve 4 is used to divert part of the pressure oil back to the oil tank to adjust the lifting speed; and the safety valve 5 is used to open the pressure relief valve to protect the hydraulic system when the system pressure is too high.

[0034] The P port connects to the hydraulic pump to provide the pressure oil source required by the system, the T port connects to the oil tank as the oil return channel, and the C port connects to the working cylinder to realize the driving and control of the hydraulic actuator.

[0035] The return oil check valve 6 includes the main check valve 1 valve core and spring. One end of the valve core is connected to the spring, which is used to control the return oil flow when the oil cylinder descends, to prevent the oil cylinder from sliding down due to its own weight when it is not in operation, and to ensure operational safety.

[0036] Reference Figure 1 - Figure 3 The main check valve 1 has two working positions. When the pressurized oil flows in one direction, it corresponds to the rising and neutral holding positions of the working cylinder. At this time, the valve core is kept closed under the action of the spring to ensure unidirectional oil flow. When the pressurized oil flows freely, it corresponds to the falling position of the working cylinder. At this time, the valve core is open to allow bidirectional oil flow. When the valve core of the compound directional valve 2 is in the rightmost position, the pressurized oil enters the working cylinder through the fixed-value throttle valve 3. The throttle valve achieves a steady upward movement by limiting the oil flow. In the second right position, the pressurized oil enters the working cylinder through the fixed-value throttle valve 3, and at the same time, part of the pressurized oil returns to the oil tank through the diverter valve 4. The diverter valve 4 reduces the flow rate into the cylinder by diverting part of the oil, achieving a slow upward movement. When the valve core of the compound directional valve 2 is in the second left position, the main check valve 1 is in a one-way shut-off state, preventing the oil in the cylinder from flowing back, and the working cylinder is held in a neutral position. The safety valve 5 is in an overflow state. When the system pressure exceeds the set value, it opens to release pressure and maintain the pressure of the working cylinder. When the valve core of the compound directional valve 2 is in the left position, the main check valve 1 is in a free-flow state, and the oil in the working cylinder flows back to the oil tank through the return oil throttle valve 7. The return oil throttle valve 7 controls the descent speed of the oil cylinder by adjusting the return oil flow. Under the action of reverse pressure oil, the valve core of the return oil check valve 6 compresses the spring to open the oil circuit, allowing the oil to flow back when the oil cylinder descends; when there is no reverse pressure, the valve core closes the oil circuit under the action of the spring to prevent the oil cylinder from descending unexpectedly.

[0037] Working principle: When the hydraulic control valve is working, the hydraulic pump supplies oil from port P, and the oil tank returns oil through port T. The valve core of the main check valve 1 remains open under the action of the spring. When the valve core of the compound directional valve 2 is pushed to the rightmost position by external force, the pressure oil enters the working cylinder through the fixed value throttle valve 3 to achieve a steady speed rise. If the valve core is in the second right position, part of the oil flows back to the oil tank through the diverter valve 4, and the oil cylinder rises slowly. The safety valve 5 opens to overflow when the oil pressure is too high to ensure system safety. When the valve core of the compound directional valve 2 moves to the second left position, the main check valve 1 closes, the oil cylinder remains in a neutral position, and the pressure oil cannot flow back. If the valve core resets to the first left position, the main check valve 1 switches to a free flow state, and the oil in the cylinder flows back to the oil tank through the return oil throttle valve 7 to achieve a descent. The descent speed is adjusted by the return oil throttle valve 7. The return oil check valve 6 opens when there is reverse oil pressure and closes with the spring when there is no pressure to prevent oil backflow.

[0038] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A hydraulic control valve used in a high-speed rice transplanter, characterized in that: It includes a main check valve (1), a compound directional valve (2), a setpoint throttle valve (3), a flow divider valve (4), a safety valve (5), a return check valve (6), and a return throttle valve (7) integrated in one valve block; The valve core of the main check valve (1) is in a normally open, rising state under the action of spring force; The valve core of the composite directional valve (2) is controlled to move left and right by the interaction of external operating force and spring, so as to realize four working states of pressure oil entering and leaving the working cylinder: rising, slow rising, neutral holding, and falling. The P port is connected to the hydraulic pump, the T port is connected to the oil tank, and the C port is connected to the working cylinder. The return oil check valve (6) includes a main check valve (1) valve core and a spring. One end of the valve core is connected to the spring, which is used to control the flow or closure of reverse pressure oil.

2. The hydraulic control valve used in the high-speed rice transplanter according to claim 1, characterized in that: The main check valve (1) has two working positions: when the pressure oil flows in one direction, it corresponds to the working cylinder rising and neutral holding positions; when the pressure oil flows freely, it corresponds to the working cylinder falling positions.

3. The hydraulic control valve used in the high-speed rice transplanter according to claim 1, characterized in that: When the valve core of the composite directional valve (2) is in the rightmost position, the pressure oil enters the working cylinder through the fixed value throttle valve (3) to achieve a steady upward movement. When it is in the second right position, the pressure oil enters the working cylinder through the fixed value throttle valve (3), and at the same time, part of the pressure oil returns to the oil tank through the diverter valve (4) to achieve a slow upward movement.

4. The hydraulic control valve used in the high-speed rice transplanter according to claim 1, characterized in that: When the valve core of the composite directional valve (2) is in the left second position, the main check valve (1) is in a one-way cut-off state, the working oil cylinder is kept in a neutral position, the safety valve (5) is in an overflow state, and the working oil cylinder pressure is kept stable.

5. The hydraulic control valve used in the high-speed rice transplanter according to claim 1, characterized in that: When the valve core of the composite directional valve (2) is in the left position, the main check valve (1) is in a free flow state, and the oil in the working cylinder flows back to the oil tank through the return oil throttle valve (7) to realize the descent of the oil cylinder, and the descent speed is adjusted by the return oil throttle valve (7).

6. The hydraulic control valve used in the high-speed rice transplanter according to claim 1, characterized in that: The return oil check valve (6) opens the oil passage by compressing the valve core spring under the action of reverse pressure oil, and closes the oil passage when there is no reverse pressure.

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