Tractor multi-way valve with double priority valves

Abstract

The utility model discloses a tractor multi-way valve with double priority valves. The multi-way valve solves the problem that an existing multi-way valve of a tractor cannot achieve the consistent sowing depth. The system comprises an oil inlet, an oil return port, an oil inlet and return unit and a first output unit, the oil inlet and return unit is provided with a first priority valve, and the system further comprises the first priority unit used for controlling the stability of agricultural machinery; the first priority coupler comprises a first reversing valve and a first working oil port, and pressure oil of the oil inlet is preferentially output to the first reversing valve and a first priority valve control cavity through the first priority valve; the constant-flow output unit is used for ensuring that the seeding depth of the seeding machine is consistent through flow; the second priority link is used for outputting the constant flow to the constant flow output link; the second priority coupler is provided with a second priority valve and a communicating oil port; and the flow at the inlet of the second priority valve is preferentially output to the constant-flow output unit, and the redundant flow is output to the first output unit through the communicating oil port. The utility model has the advantages of simple structure, reliable action, long service life and the like.

Description

Technical Field

[0001] The utility model relates to a hydraulic control system of a tractor, in particular to a multi-way valve of a tractor with a double priority valve. Background Art

[0002] Agricultural machinery refers to various machines used in the processes of crop planting and livestock production, as well as in the primary processing and handling of agricultural and livestock products. Agricultural machinery includes agricultural power machinery, farmland construction machinery, soil tillage machinery, planting and fertilizing machinery, plant protection machinery, farmland irrigation and drainage machinery, crop harvesting machinery, agricultural product processing machinery, livestock machinery, and agricultural transportation machinery, etc. A kind of agricultural machinery emerging in the current market, such as an agricultural tractor, usually needs to realize functions such as sowing, lifting and turning of farm implements, and the actions of the tractor are controlled by a hydraulic system to achieve.

[0003] Existing tractors usually do not have a priority valve, and the oil is distributed through a load sensing and pressure compensator, but it is not applicable under load conditions. Some agricultural machines also have a priority valve, which can achieve priority oil supply for one action, such as for steering priority, etc. However, in actual working conditions, such as for sowing farm implements, it usually requires the sowing depth to be consistent, and a simple priority action cannot be well achieved, and the input of the flow rate also needs to be controlled. Summary of the Utility Model

[0004] To solve the problem that the existing multi-way valve of a tractor in the background art cannot achieve a consistent sowing depth, the utility model provides a multi-way valve of a tractor with a double priority valve.

[0005] The technical solution of the utility model is: a multi-way valve of a tractor with a double priority valve, including an oil inlet, an oil return port, an oil inlet and return connection, and a first output connection. A first priority valve is provided on the oil inlet and return connection, and further includes:

[0006] A first priority connection for controlling the stability of agricultural machinery; the first priority connection includes a first reversing valve and a first working oil port. The pressure oil at the oil inlet is preferentially output to the first reversing valve and the control chamber of the first priority valve through the first priority valve; the outlet of the first reversing valve is connected to the first working oil port;

[0007] A constant flow output connection for ensuring a consistent sowing depth of the sowing machinery through the flow rate;

[0008] The second priority connection is used to output a constant flow rate to the constant flow output connection; a second priority valve and a communication oil port are provided on the second priority connection; the outlet oil pressure of the first reversing valve enters the spring chamber of the first priority valve, and the elastic force set by the spring in the spring chamber of the first priority valve cooperates with the oil pressure entering the control chamber of the first priority valve to control the opening of the first priority valve and output a flow rate to the second priority valve; the flow rate at the inlet of the second priority valve is preferentially output to the constant flow output connection, and the excess flow rate is output to the first output connection through the communication oil port.

[0009] As a further improvement of the present utility model, the second priority valve is a three-way flow valve.

[0010] As a further improvement of the present utility model, the flow rate output at the second priority valve is adjustable.

[0011] As a further improvement of the present utility model, a pressure measuring port is provided on the second priority connection, and the pressure measuring port is provided between the outlet of the second priority valve and the constant flow output connection.

[0012] As a further improvement of the present utility model, the first priority connection and the second priority connection are arranged on both sides of the inlet and return oil connection, and the second priority connection is detachably arranged with the inlet and return oil connection.

[0013] As a further improvement of the present utility model, a priority oil circuit damper is provided between the first priority valve and the first reversing valve, and the first reversing valve is an electromagnetic reversing valve.

[0014] As a further improvement of the present utility model, the outlet of the first reversing valve is provided with a pressure-taking check valve, and the pressure-taking check valve is connected to the spring chamber of the first priority valve through a first feedback damper and a second feedback damper.

[0015] As a further improvement of the present utility model, a feedback overflow valve installation port is reserved on the inlet and return oil connection, and the feedback overflow valve installation port is provided between the oil outlet of the pressure-taking check valve and the return oil port.

[0016] As a further improvement of the present utility model, a hydraulic lock is provided between the first reversing valve and the first working oil port.

[0017] As a further improvement of the present utility model, it further includes a lifting working connection, which is arranged side by side with the first output connection and is used for lifting agricultural machinery tools.

[0018] The beneficial effects of the present utility model are as follows: the first priority valve and the first priority connection are provided to control the stability of agricultural machinery tools, and the second priority connection and the constant flow output connection are provided to ensure that the sowing depth of the sowing machine is consistent, so that the stability of the agricultural machinery tools is better, and the depth is consistent during sowing, improving the sowing effect. The present utility model also has the advantages of simple structure, convenient assembly, reliable operation, and long service life. Brief Description of the Drawings

[0019] Attached Figure 1 is a schematic structural diagram of an embodiment of the present utility model.

[0020] In the figure, 1 is the oil inlet and return connection; 11 is the first priority valve; 12 is the priority oil circuit damper; 13 is the first feedback damper; 14 is the second feedback damper; 15 is the feedback overflow valve mounting port; 2 is the first output connection; 3 is the first priority connection; 31 is the first reversing valve; 32 is the first working oil port; 33 is the pressure-taking check valve; 34 is the hydraulic lock; 4 is the constant flow output connection; 5 is the second priority connection; 51 is the second priority valve; 6 is the lifting working connection; M is the pressure measurement port; P is the oil inlet; T is the oil return port; X is the communication oil port. Detailed Embodiment

[0021] The following further describes the embodiments of the present utility model with reference to the accompanying drawings:

[0022] As Figure 1 shown, a tractor multi-way valve with a double priority valve includes an oil inlet P, an oil return port T, an oil inlet and return connection 1, and a first output connection 2. A first priority valve 11 is provided on the oil inlet and return connection 1, and further includes:

[0023] A first priority connection 3 for controlling the stability of agricultural machinery and tools; the first priority connection 3 includes a first reversing valve 31 and a first working oil port 32. The pressure oil at the oil inlet P is preferentially output to the first reversing valve 31 and the control chamber of the first priority valve 11 through the first priority valve 11; the outlet of the first reversing valve 31 is connected to the first working oil port 32;

[0024] A constant flow output connection 4 for ensuring the same sowing depth of the sowing machinery through the flow rate;

[0025] The second priority connection 5 is used to output a constant flow rate to the constant flow output connection 4; a second priority valve 51 and a communication oil port X are provided on the second priority connection 5; the outlet oil pressure of the first reversing valve 31 enters the spring chamber of the first priority valve 11, and the elastic force set by the spring in the spring chamber of the first priority valve 11 cooperates with the oil pressure entering the control chamber of the first priority valve 11 to control the opening of the first priority valve 11 and output a flow rate to the second priority valve 51; the flow rate at the inlet of the second priority valve 51 is preferentially output to the constant flow output connection 4, and the excess flow rate is output to the first output connection 2 through the communication oil port X. The beneficial effects of the present invention are that a first priority valve and a first priority connection are provided to control the stability of agricultural machinery tools, and a second priority connection and a constant flow output connection are provided to ensure that the sowing depth of the sowing machinery is consistent, so that the stability of the agricultural machinery tools is better, and the depth is consistent during sowing, improving the sowing effect. The present invention also has the advantages of simple structure, convenient assembly, reliable operation, and long service life. The present invention ensures the balance of agricultural machinery tools through the first priority connection, and then ensures the sowing depth through the second priority connection and the constant flow output connection during sowing, so that the stability of the agricultural machinery tools during operation is higher, the depth is consistent during sowing, and the sowing effect is improved. Specifically, there can be multiple first output connections, or of course only one can be provided, and the tools can be replaced according to customer needs during actual use. Usually, the first output connection, the constant flow rate or the lifting working connection all include a reversing valve rod and a working oil port.

[0026] The second priority valve 51 is a three-way flow valve. Specifically, the output flow rate at the second priority valve 51 is adjustable. More specifically, a pressure measuring port M is provided on the second priority connection 5, and the pressure measuring port M is provided between the outlet of the second priority valve 51 and the constant flow output connection 4. The flow rate input to the constant flow connection can be adjusted as needed, so that the sowing depth can be adjusted. The setting of the pressure measuring port is convenient for pressure measurement, and the system safety is higher.

[0027] The first priority connection 3 and the second priority connection 5 are provided on both sides of the oil inlet and return connection 1, and the second priority connection 5 is detachably provided with the oil inlet and return connection 1. The detachable method enables it to be retained or removed according to customer needs, with a simple structure and convenient and reliable operation. Usually, an external pipeline is used to connect the communication oil port to the first output connection, which is convenient for connection.

[0028] A priority oil path damper 12 is provided between the first priority valve 11 and the first reversing valve 31, and the first reversing valve 31 is an electromagnetic reversing valve. This facilitates the stability of the flow rate input to the first priority valve, and the required flow rate is small. The setting of the electromagnetic reversing valve is convenient for switching, and the user experience is good.

[0029] The outlet of the first reversing valve 31 is provided at the pressure-taking check valve 33, and the pressure-taking check valve 33 is connected to the spring chamber of the first priority valve 11 through the first feedback damper 13 and the second feedback damper 14. Specifically, a feedback overflow valve installation port 15 is reserved on the inlet and return oil union 1, and the feedback overflow valve installation port 15 is arranged between the oil outlet and the return oil port T of the pressure-taking check valve 33. Generally speaking, the aperture of the first feedback damper is larger than that of the second feedback damper, so that the oil pressure entering the first priority valve is more stable, reducing the impact. A feedback overflow valve is provided at the feedback overflow valve installation port to increase the safety performance of the product. Of course, in the actual production process, a main overflow valve and a disc-through overflow valve are provided on the inlet and return oil union. The main overflow valve mainly ensures the overall safety of the system, and the disc-through overflow valve mainly ensures the safety of the working union.

[0030] A hydraulic lock 34 is provided between the first reversing valve 31 and the first working oil port 32. The setting of the hydraulic lock can more effectively maintain the balance of the machine tool.

[0031] The present utility model further includes a lifting working union 6, which is arranged side by side with the first output union 2 and is used for lifting agricultural machinery tools. The lifting working union can lift or lower the machine tool.

[0032] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0033] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations. In addition, in the description of the present utility model, unless otherwise stated, the meaning of "a plurality" is two or more.

[0034] Notice to all technical personnel: Although this utility model has been described according to the above specific implementation manners, the inventive concept of this utility model is not limited to this utility model only. Any modification that utilizes the inventive concept of this utility model will be included within the scope of protection of the patent right of this utility model.

Claims

1. A tractor multi-way valve with a double priority valve, comprising an oil inlet (P), an oil return port (T), an oil inlet and return link (1) and a first output link (2), wherein the oil inlet and return link (1) is provided with a first priority valve (11), characterized in that Also included: The first priority link (3) is used to control the stability of the agricultural machinery; the first priority link (3) comprises a first reversing valve (31) and a first working oil port (32); the pressure oil at the oil inlet (P) is preferentially output to the first reversing valve (31) and the control chamber of the first priority valve (11) through the first priority valve (11); the outlet of the first reversing valve (31) is connected to the first working oil port (32); A constant current output link (4) is used to ensure a consistent sowing depth of the sowing machine through flow rate; The second priority link (5) is used to output a constant flow rate to the constant flow output link (4); the second priority link (5) is provided with a second priority valve (51) and a connecting oil port (X); the oil pressure at the outlet of the first reversing valve (31) enters the spring chamber of the first priority valve (11), and the elastic force set by the spring in the spring chamber of the first priority valve (11) cooperates with the oil pressure entering the control chamber of the first priority valve (11) to control the opening of the first priority valve (11) and output the flow rate to the second priority valve (51); the flow rate at the inlet of the second priority valve (51) is preferentially output to the constant flow output link (4), and the excess flow rate is output to the first output link (2) through the connecting oil port (X).

2. A tractor multi-way valve with a double priority valve according to claim 1, characterized in that The second priority valve (51) is a three-way flow valve.

3. A tractor multi-way valve with a double priority valve according to claim 1, characterized in that The flow rate output from the second priority valve (51) is adjustable.

4. A tractor multi-way valve with a double priority valve according to claim 1, characterized in that The second priority link (5) is provided with a pressure measuring port (M), and the pressure measuring port (M) is arranged between the outlet of the second priority valve (51) and the constant current output link (4).

5. A tractor multi-way valve with a double priority valve according to claim 1, characterized in that The first priority joint (3) and the second priority joint (5) are arranged on both sides of the oil inlet and return joint (1), and the second priority joint (5) and the oil inlet and return joint (1) are detachably arranged.

6. A tractor multi-way valve with a double priority valve according to claim 1, characterized in that A priority oil circuit damper (12) is provided between the first priority valve (11) and the first reversing valve (31), and the first reversing valve (31) is an electromagnetic reversing valve.

7. A tractor multi-way valve with a double priority valve according to claim 1, characterized in that The outlet of the first reversing valve (31) is arranged at the pressure-taking check valve (33), and the pressure-taking check valve (33) is connected to the spring chamber of the first priority valve (11) via the first feedback damper (13) and the second feedback damper (14).

8. A tractor multi-way valve with a double priority valve according to claim 7, characterized in that A feedback relief valve installation port (15) is reserved on the oil inlet and return connection (1), and the feedback relief valve installation port (15) is arranged between the oil outlet of the pressure check valve (33) and the oil return port (T).

9. A tractor multi-way valve with a double priority valve according to claim 1, characterized in that A hydraulic lock (34) is provided between the first reversing valve (31) and the first working oil port (32).

10. A tractor multi-way valve with a double priority valve according to claim 1, characterized in that It also includes a lifting working link (6) which is arranged side by side with the first output link (2) and is used for lifting agricultural machinery.

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