Synchronous valve group adaptive to external agricultural implement of tractor

Abstract

The utility model relates to a synchronous valve group adaptive to an external agricultural implement of a tractor. The synchronous valve group comprises two oil cylinders, a first main oil way, a second main oil way, a branch oil way and a throttling plug, the first main oil way is connected with two branch oil ways which are connected in parallel, one-way valves with the flow direction facing the oil cylinders are arranged on the branch oil ways, the throttling plug is connected with the one-way valves in parallel, the two shunt branches are communicated with rodless cavities of the two oil cylinders respectively, and the second main oil way is connected with rod cavities of the two oil cylinders. The hydraulic system solves the technical problems that in an existing hydraulic system, double oil cylinders do not act synchronously, and differential lifting speed control is difficult to achieve.

Description

Technical Field

[0001] This utility model is a synchronization valve assembly adapted to external agricultural implements of tractors. Background Technology

[0002] Against the backdrop of rapid development in modern agricultural mechanization, tractors, as the primary power output devices, are increasingly widely used in conjunction with external agricultural implements, and the variety of agricultural implements continues to increase. In practical applications, some agricultural implements, especially those using dual-cylinder drives, place higher demands on the performance of their hydraulic systems. Traditional hydraulic control systems, in their multi-way valve designs, typically rely on single-cylinder control and lack dedicated control structures for the coordinated action of dual cylinders. This leads to asynchrony in motion when both cylinders extend and retract simultaneously (moving in and out at the same time), susceptible to uneven loads or oil circuit imbalances, thus affecting the implement's operational efficiency and stability.

[0003] Furthermore, these types of agricultural implements have varying requirements for the speed of hydraulic cylinder movement during operation. Specifically, rapid response is needed during lifting to improve work efficiency, while a relatively slow speed is desired during descent to ensure smooth operation and prevent impact from gravity. However, existing hydraulic valve assembly structures struggle to simultaneously meet the flow control requirements for both rapid ascent and slow descent, lacking targeted adjustment methods and failing to adapt to the refined control needs of different operating scenarios.

[0004] Therefore, how to design a hydraulic valve group structure that can meet the requirements of synchronous action of dual cylinders, is not affected by load, and has the function of differentiated control of lifting and lowering speed has become a key problem that needs to be solved in the current hydraulic control technology of agricultural machinery. Utility Model Content:

[0005] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a synchronization valve group that is compatible with external agricultural implements of tractors.

[0006] A synchronization valve assembly adapted for external agricultural implements on tractors includes two hydraulic cylinders, a first main hydraulic circuit, a second main hydraulic circuit, branch hydraulic circuits, and a throttling plug. The first main hydraulic circuit is connected to two parallel branch hydraulic circuits. Each branch hydraulic circuit is equipped with a check valve that directs the flow toward the hydraulic cylinder. The throttling plug is connected in parallel with the check valve. The two branch hydraulic circuits are respectively connected to the rodless chambers of the two hydraulic cylinders. The second main hydraulic circuit is connected to the rod chambers of the two hydraulic cylinders.

[0007] Furthermore, a flow divider / combiner valve is installed on the branch oil line.

[0008] Furthermore, hydraulic locks are installed on the branch oil lines.

[0009] Furthermore, the hydraulic lock includes two hydraulically controlled check valves respectively located on two branch oil lines.

[0010] Furthermore, the oil ports of the first and second main oil circuits are respectively connected to the multi-way valves that come with the tractor.

[0011] Beneficial effects: Compared with the prior art, the present invention has the following advantages:

[0012] • Achieve synchronous lifting and lowering of dual cylinders to adapt to load changes: Through the connection between the first main oil circuit and the parallel branch oil circuit, and with the diversion and collection valve in the branch oil circuit, the flow can be automatically adjusted even if the loads on the two cylinders are inconsistent, so as to achieve synchronous action of the dual cylinders, significantly improving synchronization accuracy and work consistency, and is particularly suitable for agricultural working conditions with non-homogeneous loads.

[0013] Improve the upward response speed and enhance work efficiency: Install a one-way valve in the branch oil circuit to make the oil flow direction unidirectional during the upward process of the cylinder, reduce flow resistance, improve hydraulic response speed, and thus speed up the work rhythm.

[0014] Adjustable descent speed to meet various operational needs: The throttling plug and one-way valve are arranged in parallel, allowing the hydraulic cylinder to control the descent rhythm by adjusting the return oil speed during descent, meeting the action speed requirements of different agricultural implements and improving operational flexibility.

[0015] Achieving pressure holding control and improving equipment safety and stability: A hydraulic lock is installed in the branch oil circuit, consisting of two hydraulically controlled check valves. It can automatically close the oil circuit when the hydraulic system loses power or pressure, preventing the oil cylinder from sliding on its own, effectively maintaining the working position, and ensuring the safety and accuracy of the equipment during operation.

[0016] Easy integration with tractor hydraulic systems, improving versatility and scalability: The first and second main oil circuits are connected to the tractor's built-in multi-way valve via oil ports, enabling precise control without the need for additional control equipment. It is highly adaptable and easy to promote and use on various models of tractors and matching agricultural implements. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a synchronization valve assembly adapted for use with external agricultural implements on tractors.

[0018] In the diagram, 1 is a multi-way valve, 2 is the first main oil circuit, 3 is the second main oil circuit, 4 is a branch oil circuit, 6 is a check valve, 7 is a throttle plug, 8 is a hydraulic lock, and 9 is a flow divider / combiner valve. Detailed Implementation

[0019] To enhance understanding of this utility model, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. These embodiments are only used to explain the present utility model and do not constitute a limitation on the scope of protection of the present utility model.

[0020] A synchronization valve assembly adapted to tractor-mounted agricultural implements includes two hydraulic cylinders, a first main hydraulic circuit 2, a second main hydraulic circuit 3, branch hydraulic circuits 4, and a throttling plug 7. The first main hydraulic circuit 2 is connected to two parallel branch hydraulic circuits 4. Each branch hydraulic circuit 4 is equipped with a one-way valve 6 that directs the flow toward the hydraulic cylinder. The throttling plug 7 is connected in parallel with the one-way valve 6. The two branch hydraulic circuits are respectively connected to the rodless chambers of the two hydraulic cylinders. The second main hydraulic circuit 3 is connected to the rod chambers of the two hydraulic cylinders. The ports of the first main hydraulic circuit 2 and the second main hydraulic circuit 3 are respectively connected to the multi-way valve 1 that comes with the tractor.

[0021] The first main oil circuit 2 of the synchronizing valve assembly is connected to two branch oil circuits 4. Each branch oil circuit 4 leads to the rodless chamber of two cylinders, thereby controlling the synchronous action of the two cylinders. Each branch oil circuit 4 is equipped with a one-way valve 6 flowing towards the rodless chamber, realizing one-way flow of oil during the rising process and ensuring that the cylinder responds quickly to the lifting action.

[0022] Meanwhile, the throttle plug 7 and the one-way valve 6 are arranged in parallel, which can adjust the return oil flow rate during the descent, thereby achieving adjustable control of the cylinder descent speed. The second main oil circuit 3 is directly connected to the rod chamber of the two cylinders, used for synchronously introducing or exporting hydraulic oil to achieve synchronous cylinder contraction. The entire system can be connected to the tractor's multi-way valve 1 system, and the synchronous lifting and lowering actions of the two cylinders can be controlled by adjusting the hydraulic flow and direction.

[0023] This synchronizing valve assembly enables the synchronized lifting and lowering of two hydraulic cylinders connected to the outside of the tractor, adapting to the needs of various agricultural implements. Specifically, a one-way valve 6 installed in the branch hydraulic circuit 4 improves the system's response speed during cylinder lifting, while a throttle plug 7 provides adjustable lowering speed to accommodate different implement operation requirements. The two cylinders work collaboratively through parallel hydraulic circuits and control devices, effectively reducing asynchrony caused by uneven load, thus improving system stability and operational consistency.

[0024] In one possible implementation, a flow divider / combiner valve 9 is provided on the branch oil circuit 4.

[0025] The flow divider / combiner valve 9 is located on the branch oil circuit 4. Its main function is to automatically adjust the flow rate according to the changes in the load on the two cylinders. The flow divider / combiner valve 9 enables the two cylinders to maintain synchronous operation even under different loads. It achieves automatic flow rate balance by dynamically distributing the oil entering the two cylinders and balancing the flow rate difference. Regardless of changes in the external load, the flow divider / combiner valve 9 can dynamically adjust the output, effectively preventing one cylinder from moving ahead of or behind the other.

[0026] By introducing the flow divider / combiner valve 9, synchronous lifting and lowering can be achieved even when the two cylinders are under uneven loads during actual operation, significantly improving the accuracy of synchronous control. This structure is particularly suitable for agricultural operations with drastic load changes or non-homogeneous loads, enhancing the adaptability and operational reliability of the synchronization valve assembly.

[0027] In one possible implementation, a hydraulic lock 8 is provided on the branch oil circuit 4.

[0028] Hydraulic lock 8 is installed on branch oil circuit 4 to maintain pressure and lock the cylinder in case of system power failure or oil supply stoppage, preventing it from changing position. Hydraulic lock 8 typically consists of a pilot-operated check valve 6, which only opens when the hydraulic system supplies control oil, allowing bidirectional oil flow. In the absence of control pressure, the valve core closes, thus blocking the cylinder's oil path and ensuring that the cylinder will not move under any load.

[0029] The hydraulic lock 8 enables reliable pressure holding of the hydraulic cylinder. When the tractor stops working or the hydraulic power source is temporarily disconnected, the hydraulic cylinder can be effectively kept in its original position, improving the operational safety and reliability of the equipment. It is especially suitable for agricultural implements that need to be maintained in a specific posture for a long time.

[0030] In one possible implementation, the hydraulic lock 8 includes two hydraulically controlled check valves 6 respectively located on two branch oil lines 4.

[0031] A hydraulically controlled check valve 6 is installed on each of the two branch oil circuits 4, serving as a key component of the hydraulic lock 8. This structure ensures that the oil inlet path of each cylinder has independent pressure holding capability, thus maintaining its position even when any cylinder stops moving or experiences a sudden change in load. The hydraulically controlled check valve 6 opens upon receiving a signal from the control port, allowing oil to flow in both directions, and immediately returns to the closed state after the control oil source is disconnected.

[0032] By setting two hydraulic control check valves 6 respectively, the independent control capability and safety of the hydraulic lock 8 can be further improved, preventing mutual interference caused by the connection between oil cylinders, thereby ensuring the stability of the equipment under the multi-point support structure, which is particularly suitable for the scenario requirements when a tractor is used with multi-functional agricultural implements.

[0033] Instructions for use: By connecting to the tractor's multi-way valve 1, synchronous lifting and lowering of two hydraulic cylinders can be achieved without being affected by external loads (using the flow divider and combiner valve 9); the lowering process can be adjusted by the throttle plug 7 to achieve on-demand control of the lowering speed; the lifting process is responsive through the one-way valve 6 circuit; the hydraulic lock 8, composed of two hydraulically controlled one-way valves 6, can effectively maintain the position of the hydraulic cylinder during operation and achieve reliable pressure holding.

[0034] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. 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 synchronizing valve group for adapting an external agricultural implement to a tractor, characterized in that, It includes two hydraulic cylinders, a first main hydraulic circuit, a second main hydraulic circuit, branch hydraulic circuits, and a throttling plug. The first main hydraulic circuit is connected to two parallel branch hydraulic circuits. The branch hydraulic circuits are equipped with one-way valves that flow towards the hydraulic cylinders. The throttling plug is connected in parallel with the one-way valves. The two branch hydraulic circuits lead to the rodless chambers of the two hydraulic cylinders respectively. The second main hydraulic circuit is connected to the rod chambers of the two hydraulic cylinders.

2. The synchronized valve group for adapting tractor external agricultural machine tool according to claim 1, characterized in that, A flow divider / combiner valve is installed on the branch oil line.

3. The synchronized valve group for adapting tractor attached farm implements according to claim 1, wherein, Hydraulic locks are installed on the branch oil lines.

4. The synchronized valve group for adapting a tractor to an external agricultural implement according to claim 3, characterized in that, The hydraulic lock includes two hydraulically controlled check valves respectively located on two branch oil lines.

5. The synchronized valve group for adapting tractor attached farm implements according to claim 1, wherein, The first and second main oil lines are connected to the tractor's own multi-way valve via their respective oil inlets.

Images