A hydraulic oil supply distribution circuit and a loader

Abstract

This invention discloses a hydraulic oil supply distribution circuit and a loader, comprising: an oil pump, the outlet of which is connected to the inlet of a priority-type hydraulic directional valve; a first outlet of the priority-type hydraulic directional valve connected to the inlet of a first implement hydraulic system via a variable throttle valve; a second outlet of the priority-type hydraulic directional valve connected to the inlet of a second implement hydraulic system; the inlet of the first implement hydraulic system connected via throttle valves to the inlet of a safety valve, the inlet of a solenoid directional valve, and the spring end control port of the priority-type hydraulic directional valve; the outlets of the safety valve and the solenoid directional valve connected to an oil tank; and the non-spring end control port of the priority-type hydraulic directional valve connected to the inlet of the variable throttle valve. This invention solves the problem of oil supply and distribution, ensuring that the implement can move and operate smoothly.

Description

Technical Field

[0001] This invention belongs to the field of loader technology, specifically relating to a hydraulic oil source distribution circuit and a loader. Background Technology

[0002] For loaders, a single system often includes multiple implement hydraulic systems such as a bucket working hydraulic system, a quick-change hydraulic system, and a clamping hydraulic system. However, due to space and cost constraints, multiple implements need to share a single hydraulic oil source. This necessitates addressing issues such as safe pressure relief, pressure regulation, flow distribution, and priority management for each implement system. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a hydraulic oil supply distribution circuit and a loader, which solves the problems of oil supply and distribution, ensuring that the machine can perform actions and operate smoothly.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] In a first aspect, a hydraulic oil supply distribution circuit is provided, comprising: an oil pump, the outlet of which is connected to the inlet of a priority-type hydraulic directional valve; a first outlet of the priority-type hydraulic directional valve is connected to the inlet of a first machine tool hydraulic system via a variable throttle valve; a second outlet of the priority-type hydraulic directional valve is connected to the inlet of a second machine tool hydraulic system; the inlet of the first machine tool hydraulic system is connected to the inlet of a safety valve, the inlet of a solenoid directional valve, and the spring end control port of the priority-type hydraulic directional valve via throttle valves; the outlets of the safety valve and the solenoid directional valve are connected to an oil tank; and the non-spring end control port of the priority-type hydraulic directional valve is connected to the inlet of the variable throttle valve.

[0006] Furthermore, the oil pump is a fixed displacement pump.

[0007] Furthermore, when the first machine hydraulic system is not activated and the second machine hydraulic system is activated, the solenoid directional valve is not energized and is in the open state. The spring end of the priority hydraulic directional valve controls the oil port to be connected to the oil tank through the solenoid directional valve. The priority hydraulic directional valve is in the first position and supplies oil to the second machine hydraulic system.

[0008] Furthermore, when the hydraulic system of the first tool needs to operate, the solenoid directional valve is energized and in the closed state. The spring end control port of the priority hydraulic directional valve is connected to the oil inlet of the hydraulic system of the first tool through a throttle valve. The priority hydraulic directional valve is in the second position, supplying oil to the hydraulic system of the first tool.

[0009] Furthermore, when the pressure of the hydraulic system of the first machine reaches the set pressure of the safety valve with an adjustable preset pressure, the safety valve opens to release pressure from the system.

[0010] Furthermore, the priority-type hydraulic control directional valve is a two-position three-way directional valve.

[0011] Furthermore, the electromagnetic directional valve is a two-position two-way directional valve.

[0012] Furthermore, the second implement hydraulic system includes at least one of the loader's bucket working hydraulic system, quick-change hydraulic system, and clamping hydraulic system.

[0013] Furthermore, the oil pump is a variable displacement pump; the first oil inlet of the shuttle valve is connected to the oil inlet of the first tool hydraulic system; the second oil inlet of the shuttle valve is connected to the oil inlet of the second tool hydraulic system; and the oil outlet of the shuttle valve is connected to the control oil port of the variable displacement pump.

[0014] In a second aspect, a loader is provided, the loader being equipped with a distribution circuit for the hydraulic oil source described in the first aspect.

[0015] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: The present invention connects the oil pump outlet to the oil inlet of the priority hydraulic directional valve; the first oil outlet of the priority hydraulic directional valve is connected to the oil inlet of the first tool hydraulic system through a variable throttle valve; the second oil outlet of the priority hydraulic directional valve is connected to the oil inlet of the second tool hydraulic system; the oil inlet of the first tool hydraulic system is connected to the oil inlet of the safety valve, the oil inlet of the solenoid directional valve, and the spring end control oil port of the priority hydraulic directional valve through throttle valves respectively; the oil outlets of the safety valve and the solenoid directional valve are respectively connected to the oil tank; the non-spring end control oil port of the priority hydraulic directional valve is connected to the oil inlet of the variable throttle valve, thus solving the problem of oil supply and distribution, ensuring that the tool can perform actions and operate smoothly. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a hydraulic oil source distribution circuit provided in Embodiment 1 of the present invention;

[0017] Figure 2 This is a schematic diagram of a hydraulic oil source distribution circuit provided in Embodiment 2 of the present invention;

[0018] In the diagram: 1. Oil tank; 2. Oil pump; 3. Priority hydraulic directional valve; 4. Variable throttle valve; 5. Throttle valve; 6. Safety valve; 7. Solenoid directional valve; 8. First tool hydraulic system; 9. Second tool hydraulic system; 10. Shuttle valve. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0020] It should be noted that in the description of this invention, the terms "front," "rear," "left," "right," "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used only for the convenience of describing the invention and do not require the invention to be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. The terms "front," "rear," "left," "right," "upper," and "lower" used in the description of this invention refer to the directions shown in the accompanying drawings, while the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0021] Example 1:

[0022] like Figure 1 As shown, a hydraulic oil source distribution circuit includes: an oil tank 1, an oil pump 2, a priority-type hydraulic control directional valve 3, a variable throttle valve 4, a throttle valve 5, a safety valve 6, a solenoid directional valve 7, a first tool hydraulic system 8, and a second tool hydraulic system 9.

[0023] The outlet of oil pump 2 is connected to the inlet of priority hydraulic directional valve 3; priority hydraulic directional valve 3 is a two-position three-way directional valve, the first outlet (port CF) of priority hydraulic directional valve 3 is connected to the inlet of the first tool hydraulic system 8 through variable throttle valve 4; the second outlet (port EF) of priority hydraulic directional valve 3 is connected to the inlet of the second tool hydraulic system 9; the inlet of the first tool hydraulic system 8 is connected to the inlet of safety valve 6, the inlet of solenoid directional valve 7, and the spring end control port (port A) of priority hydraulic directional valve 3 through throttle valve 5; solenoid directional valve 7 is a two-position two-way solenoid valve; the outlet of safety valve 6 and the outlet of solenoid directional valve 7 are connected to oil tank 1; the non-spring end control port (port B) of priority hydraulic directional valve 3 is connected to the inlet of variable throttle valve 4.

[0024] Oil pump 2 is a fixed displacement pump. The fixed displacement pump draws oil from oil tank 1 and delivers it to the oil inlet of priority hydraulic directional valve 3 to provide oil supply for the system.

[0025] When the first hydraulic system 8 is not operating and the second hydraulic system 9 is operating, the solenoid directional valve 7 is not energized and is in the first position and open state. The spring end control port A of the priority hydraulic directional valve 3 is connected to the oil tank 1, and the priority hydraulic directional valve 3 is in the first position, supplying oil to the second hydraulic system 9. When the first hydraulic system 8 needs to operate, the solenoid directional valve 7 is energized and is in the second position and closed state. The spring end control port A of the priority hydraulic directional valve 3 is connected to the oil inlet of the first hydraulic system 8 through the throttle valve 5, and the priority hydraulic directional valve 3 is in the second position, supplying oil to the first hydraulic system 8. When the pressure of the first hydraulic system 8 reaches the maximum pressure set by the safety valve 6, the safety valve 6 opens, protecting the system. The variable throttle valve 4 can change the throttling area according to system needs.

[0026] The above describes a hydraulic oil supply distribution circuit and control method. It can achieve direct oil supply to the second tool system via a pump; alternatively, it can automatically prioritize oil supply to the second tool system, providing it with a stable oil source, and a safety valve limits its maximum system pressure. This safety valve is equipped with an adjustable preset pressure to meet the needs of systems with different pressure levels. This invention can rationally control oil supply distribution, improve system lifespan, and simplify the second tool system.

[0027] Example 2:

[0028] like Figure 1 , Figure 2 As shown, the only difference between this embodiment and Embodiment 1 is that in this embodiment, the oil pump 1 is a variable pump and includes a shuttle valve 10. The variable pump draws oil from the oil tank 1 and delivers it to the inlet of the priority hydraulic directional valve 3 to provide an oil source for the system. The first inlet (port A) of the shuttle valve 10 is connected to the inlet of the first tool hydraulic system 8; the second inlet (port B) of the shuttle valve 10 is connected to the inlet of the second tool hydraulic system 9; and the outlet of the shuttle valve 10 is connected to the control port of the variable pump.

[0029] The two ends of the shuttle valve 10 are connected to the oil inlets of the hydraulic systems of two tools respectively. When either tool moves, it will send a pressure signal back to the variable pump. After the variable pump is internally controlled, the pump flow is output on demand.

[0030] Example 3:

[0031] Based on the hydraulic oil source distribution circuit described in Embodiment 1 and Embodiment 2, this embodiment provides a loader, which is equipped with the hydraulic oil source distribution circuit described in Embodiment 1 or Embodiment 2.

[0032] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A hydraulic oil source distribution circuit, characterized in that, include: Oil pump (2), the outlet of which is connected to the inlet of priority hydraulic directional valve (3); the first outlet of priority hydraulic directional valve (3) is connected to the inlet of first tool hydraulic system (8) through variable throttle valve (4); the second outlet of priority hydraulic directional valve (3) is connected to the inlet of second tool hydraulic system (9); the inlet of first tool hydraulic system (8) is connected to the inlet of safety valve (6), the inlet of solenoid directional valve (7) and the spring end control port of priority hydraulic directional valve (3) through throttle valve (5); the outlet of safety valve (6) and the outlet of solenoid directional valve (7) are connected to oil tank (1); the non-spring end control port of priority hydraulic directional valve (3) is connected to the inlet of variable throttle valve (4); When the first hydraulic system (8) is not activated and the second hydraulic system (9) is activated, the solenoid directional valve (7) is not energized and is in the open state. The spring end of the priority hydraulic directional valve (3) controls the oil port to be connected to the oil tank (1) through the solenoid directional valve (7). The priority hydraulic directional valve (3) is in the first position and supplies oil to the second hydraulic system (9). When the first tool hydraulic system (8) needs to operate, the solenoid directional valve (7) is energized and is in the closed state. The spring end control oil port of the priority hydraulic directional valve (3) is connected to the oil inlet of the first tool hydraulic system (8) through the throttle valve (5). The priority hydraulic directional valve (3) is in the second position and supplies oil to the first tool hydraulic system (8). When the pressure of the first machine hydraulic system (8) reaches the set pressure of the safety valve (6) with adjustable preset pressure, the safety valve (6) opens to release pressure from the system.

2. The hydraulic oil source distribution circuit according to claim 1, characterized in that, The oil pump (2) is a fixed displacement pump.

3. The hydraulic oil source distribution circuit according to claim 1, characterized in that, The priority type hydraulic control directional valve (3) is a two-position three-way directional valve.

4. The hydraulic oil source distribution circuit according to claim 1, characterized in that, The electromagnetic reversing valve (7) is a two-position two-way reversing valve.

5. The hydraulic oil source distribution circuit according to claim 1, characterized in that, The second implement hydraulic system (9) includes at least one of the loader's bucket working hydraulic system, quick-change hydraulic system and clamp hydraulic system.

6. The hydraulic oil source distribution circuit according to claim 1, characterized in that, The oil pump (2) is a variable pump; the first oil inlet of the shuttle valve (10) is connected to the oil inlet of the first tool hydraulic system (8); the second oil inlet of the shuttle valve (10) is connected to the oil inlet of the second tool hydraulic system (9); and the oil outlet of the shuttle valve (10) is connected to the control oil port of the variable pump.

7. A loader, characterized in that, The loader is equipped with a hydraulic oil source distribution circuit as described in any one of claims 1 to 6.

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