Hydraulic resistance buffer control pilot valve, pilot system and engineering machinery

Abstract

The present invention provides a hydraulic resistance buffer control pilot valve, comprising: a pair of pilot control units, correspondingly connected with a pair of main valve pilot working oil ports of a main valve; each pilot control unit comprises: a valve body, a first one-way valve, and a proportional throttle valve; the valve body has a pilot oil inlet and outlet and a pilot working oil port, the oil inlet of the first one-way valve is connected with the pilot oil inlet and outlet, the oil outlet of the first one-way valve is connected with the pilot working oil port, the pilot working oil port is connected with a corresponding main valve pilot working oil port, the oil inlet and regulating oil port of the proportional throttle valve are connected with the oil outlet of the first one-way valve, and the oil outlet and oil discharge port of the proportional throttle valve are both connected with the return oil tank. The hydraulic resistance buffer control pilot valve, hydraulic resistance buffer control pilot system and engineering machinery provided by the present invention buffer the oil pressure on the oil circuit where the pilot control unit is located, thereby solving the problem that the oil pressure in the pilot working oil circuit where the pilot valve is connected with the main valve in the prior art cannot be buffered.

Description

Technical Field

[0001] The present invention relates to the field of hydraulic control technology, and in particular to a hydraulic resistance buffer control pilot valve, a hydraulic resistance buffer control pilot system and an engineering machine. Background Art

[0002] Generally, a one-way buffer and damping joint is arranged between the pilot valve and the main valve to delay the response time of the actuator action. In the prior art, the oil usually enters from the buffer and damping joint connected to the pilot working oil port on one side of the main valve. When the oil enters, it directly enters the cavity on one side of the main valve through the one-way valve to act on the valve core of the main valve. In the process of pushing the valve core to move in the cavity, the oil in the cavity on the other side is squeezed out, and the squeezed oil is returned through the corresponding buffer and damping joint. However, in the process of returning oil, the buffering effect of the buffer and damping joint is certain and cannot be adjusted according to the oil pressure, thus causing problems such as poor buffering effect and high oil consumption. Therefore, a device is urgently needed to solve at least one of the above technical problems. Summary of the invention

[0003] The purpose of the embodiments of the present invention is to provide a hydraulic resistance buffer control pilot valve, a hydraulic resistance buffer control pilot system and an engineering machinery to solve the problem of poor buffering effect of the buffer damping joint in the pilot working oil circuit connecting the pilot valve and the main valve in the prior art.

[0004] In order to achieve the above-mentioned object, the first aspect of the present invention provides a hydraulic resistance buffer control pilot valve, which is connected to the oil return tank and to a pair of main valve pilot working oil ports of the main valve, and the pilot valve comprises: a pair of pilot control units, which are correspondingly connected to the pair of main valve pilot working oil ports of the main valve;

[0005] Each pilot control unit includes: a valve body, a first one-way valve, and a proportional throttle valve; the valve body has a pilot oil inlet and outlet and a pilot working oil port, the oil inlet of the first one-way valve is connected to the pilot oil inlet and outlet, the oil outlet of the first one-way valve is connected to the pilot working oil port, the pilot working oil port is connected to a corresponding pilot working oil port of a main valve, the oil inlet and regulating oil port of the proportional throttle valve are connected to the oil outlet of the first one-way valve, and the oil outlet and oil unloading port of the proportional throttle valve are both connected to the return oil tank.

[0006] Specifically, each pilot control unit also includes: a first throttle valve arranged between the first one-way valve and the proportional throttle valve, the oil inlet of the first throttle valve is connected to the oil outlet of the first one-way valve, and the oil outlet of the first throttle valve is connected to the oil inlet and regulating oil port of the proportional throttle valve.

[0007] Specifically, a first regulating interface is also provided on the valve body of each pilot control unit, and the first regulating interfaces of a pair of pilot control units are connected to each other to form a first oil circuit;

[0008] The pilot valve further includes: a first regulating valve, which is disposed in the first oil circuit and is used to regulate the oil flow and pressure in the first oil circuit.

[0009] Specifically, the first regulating valve is a throttle valve.

[0010] Specifically, a second regulating interface is also provided on the valve body of each pilot control unit, and the second regulating interfaces of a pair of pilot control units are connected to each other to form a second oil circuit;

[0011] The pilot valve further includes: a second regulating valve and two second one-way valves, wherein the second regulating valve is arranged on the second oil circuit and is used to regulate the oil flow and pressure in the second oil circuit;

[0012] The first oil circuit and the second oil circuit are also provided with a second one-way valve respectively, and the second one-way valve is used to control the flow direction of the oil in the corresponding first oil circuit or the second oil circuit, wherein the flow directions of the oil in the first oil circuit and the second oil circuit are opposite.

[0013] Specifically, the second regulating valve is a throttle valve.

[0014] On the other hand, the present invention provides a hydraulic resistance buffer control pilot system, comprising: a return oil tank, multiple groups of hydraulic resistance buffer control pilot valves as described in any of the above items, multiple groups of main valves and multiple groups of connecting valve groups, each of the pilot valves is correspondingly connected to a pair of main valve pilot working oil ports of the corresponding main valve, a connecting oil circuit is arranged between every two pilot valves, and a group of connecting valve groups is arranged on each connecting oil circuit, and the connecting valve group is used to control the oil flow direction between the corresponding two pilot valves.

[0015] Specifically, the connecting valve group includes: a third one-way valve, which is arranged on the connecting oil circuit between the corresponding two pilot valves and is used to control the flow direction of oil on the corresponding connecting oil circuit.

[0016] Specifically, the connecting valve group further includes: a second throttle valve, which is arranged on the connecting oil circuit between the corresponding two pilot valves and is used to adjust the oil flow and pressure on the corresponding connecting oil circuit.

[0017] In yet another aspect, the present invention provides an engineering machine, wherein the engineering machine comprises any one of the above-mentioned hydraulic resistance buffer control pilot systems.

[0018] The hydraulic resistance buffer control pilot valve provided by the present invention is connected with a pair of main valve pilot working oil ports through a pair of pilot control units of the pilot valve, that is, the pilot working oil port of each pilot control unit is connected with a corresponding main valve pilot working oil port, and the oil flow direction is controlled by a first one-way valve arranged on the oil circuit between the pilot oil inlet and the pilot working oil port. The oil enters the pilot control unit from the pilot oil inlet, and is divided into two paths after passing through the first one-way valve. One path flows through the main valve pilot working oil port and enters a side cavity of the main valve and acts on the valve core of the main valve to push the main valve. The valve core moves, and the movement of the valve core causes the oil in the cavity on the other side of the main valve to flow out from the other main valve pilot working oil port of the main valve, and the outflowing oil returns to the oil after passing through the proportional throttle valve of another pilot control unit. The proportional throttle valve can adjust the return oil pressure according to the oil pressure of the oil entering from its oil inlet, thereby buffering the oil pressure in the pilot working oil circuit of the pilot valve and the main valve, improving the buffer response time, reducing impact and oil consumption, and the other oil flowing out of the first one-way valve returns to the oil after passing through the proportional throttle valve of the pilot control unit where it is located, thereby buffering the oil pressure in the oil circuit where the pilot control unit is located.

[0019] The hydraulic resistance buffer control pilot valve, hydraulic resistance buffer control pilot system and engineering machinery provided by the present invention respectively connect a pilot control unit of a pilot valve to a pair of main valve pilot working oil ports of the main valve, so as to buffer the oil pressure on the oil circuit where the pilot control unit is located through the corresponding pilot control unit, thereby solving the problem of poor buffering effect of the buffer damping joint in the pilot working oil circuit connecting the pilot valve and the main valve in the prior art.

[0020] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. In the accompanying drawings:

[0022] Figure 1 It is a hydraulic principle diagram of the hydraulic resistance buffer control pilot valve provided by the present invention;

[0023] Figure 2 It is a hydraulic principle diagram of another hydraulic resistance buffer control pilot valve provided by the present invention;

[0024] Figure 3 It is a hydraulic principle diagram of the hydraulic resistance buffer control pilot system provided by the present invention.

[0025] Description of Reference Numerals

[0026] 1 Main valve 2 Pilot control unit

[0027] 3 First regulating valve 4 Second regulating valve

[0028] 5 Second check valve 6 Connecting valve group

[0029] 20 Valve body 21 First check valve

[0030] 22 First throttle valve 23 Proportional throttle valve

[0031] 61 Third check valve 62 Second throttle valve

[0032] 201 Pilot oil inlet and outlet 202 Pilot oil working port

[0033] 203 first adjustment interface 204 second adjustment interface DETAILED DESCRIPTION

[0034] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0035] In the embodiments of the present invention, unless otherwise specified, directional words such as "up, down, top, bottom" are usually used with reference to the directions shown in the drawings or are used to describe the relative positional relationships of components in the vertical, perpendicular or gravity direction.

[0036] In a first aspect of the present invention, a hydraulic resistance buffer control pilot valve is provided. Figure 1 It is a hydraulic principle diagram of a hydraulic resistance buffer control pilot valve, which is connected to the return oil tank and to a pair of main valve pilot working oil ports of the main valve 1. The pilot valve includes: a pair of pilot control units 2, which are correspondingly connected to the pair of main valve pilot working oil ports of the main valve 1; each pilot control unit 2 includes: a valve body 20, a first one-way valve 21, and a proportional throttle valve 23; the valve body 20 has a pilot inlet and outlet oil port 201 and a pilot working oil port 202, the oil inlet of the first one-way valve 21 is connected to the pilot inlet and outlet oil port 201, the oil outlet of the first one-way valve 21 is connected to the pilot working oil port 202, the pilot working oil port 202 is connected to a corresponding main valve pilot working oil port, the oil inlet and regulating oil port of the proportional throttle valve 23 are connected to the oil outlet of the first one-way valve 21, and the oil outlet and oil unloading port of the proportional throttle valve 23 are both connected to the return oil tank.

[0037] In the hydraulic resistance buffer control pilot valve provided by the present invention, a pair of main valve pilot working oil ports of the main valve 1 are respectively connected to a pair of pilot control units 2 of the pilot valve, and a pilot working oil port 202 of a pilot control unit 2 is connected to the main valve pilot working oil port corresponding to the main valve 1. Figure 1As shown, a pair of pilot control units 2 of the pilot valve are defined as pilot control unit a and pilot control unit b, respectively. A pair of main valve pilot working oil ports of the main valve 1 are marked as main valve pilot working oil port 11 and main valve pilot working oil port 12. The pilot working oil port 202 of the pilot control unit a is connected to the main valve pilot working oil port 11, and the pilot working oil port 202 of the pilot control unit b is connected to the main valve pilot working oil port 12. The oil enters from the pilot inlet and outlet ports 201 of the pilot control unit a, flows through the first check valve 21 in the pilot control unit a, and is divided into two paths. One path passes through the pilot working oil port 201 of the pilot control unit a. The oil enters the cavity of the main valve 1 through the pilot working oil port 202 and the main valve pilot working oil port 11. The oil acts on the valve core of the main valve 1 to push the valve core to move in the cavity of the main valve 1, thereby changing the cavity size on both sides of the valve core. During the movement of the valve core, the volume of the cavity on the oil entering side increases, and the volume of the cavity on the other side of the valve core decreases, so that the oil in the cavity on the other side of the valve core flows out from the other main valve pilot working oil port 12 of the main valve 1. The outflowing oil enters the pilot control unit b through the pilot working oil port 202 of the pilot control unit b. The oil cannot flow out through the first one-way valve 21 of the pilot control unit b. Finally, the oil passes through The proportional throttle valve 23 in the pilot control unit b returns oil. The proportional throttle valve 23 includes a throttle valve. The valve core opening of the throttle valve of the proportional throttle valve 23 is determined by the oil pressure entering from the oil inlet of the proportional throttle valve 23. The valve core opening of the throttle valve is determined so that the oil flow and pressure in the oil circuit during oil return can be adjusted, and the oil pressure and oil flow in the oil return oil circuit can be further controlled, so that the oil pressure in the oil circuit is buffered during the oil return process, reducing impact and oil consumption. The other oil flowing out after the first one-way valve 21 of the pilot control unit a returns oil through the proportional throttle valve 23 in the pilot control unit a. The pilot control unit The valve core opening of the throttle valve of the proportional throttle valve 23 of element a is determined by the oil pressure of the pilot inlet and outlet oil ports 201 of the pilot control unit a. The proportional throttle valve 23 in the pilot control unit a adjusts the return oil flow and oil pressure of the oil in the oil circuit where it is located, so that the oil pressure of the oil in the oil circuit where the pilot control unit a is located is buffered during the oil return process. The hydraulic resistance buffer control pilot valve provided by the present invention buffers the oil pressure in the oil circuit where the pilot control unit 2 is located through the corresponding pilot control unit 2, thereby solving the problem of poor buffering effect of the buffer damping joint in the pilot working oil circuit connecting the pilot valve and the main valve 1 in the prior art.

[0038] In order to further improve the buffering effect of the hydraulic resistance buffer control pilot valve in the oil circuit, each pilot control unit 2 also includes: a first throttle valve 22 arranged between the first one-way valve 21 and the proportional throttle valve 23, the oil inlet of the first throttle valve 22 is connected with the oil outlet of the first one-way valve 21, and the oil outlet of the first throttle valve 22 is connected with the oil inlet and the regulating oil port of the proportional throttle valve 23. The oil volume flowing out of the oil outlet of the first one-way valve 21 is adjusted by the first throttle valve 22, so as to ensure that the oil pressure of the oil flowing through the proportional throttle valve 23 is relatively stable, and the impact of the oil on the proportional throttle valve 23 is reduced.

[0039] like Figure 1 As shown, a first regulating interface 203 is also provided on the valve body 20 of each pilot control unit 2, and the first regulating interfaces 203 of a pair of pilot control units 2 are interconnected to form a first oil circuit; the pilot valve also includes: a first regulating valve 3, which is arranged on the first oil circuit and is used to adjust the oil flow and pressure in the first oil circuit. The first regulating valve 3 is a throttle valve. The first regulating valve 3 is arranged on the first oil circuit so that the two pilot control units 2 are interconnected, so that the impact on the oil circuits in which they are located can be shared by the two pilot control units 2.

[0040] In order to more accurately control the oil flow between the two pilot control units 2, such as Figure 2 As shown, a second regulating interface 204 is also provided on the valve body 20 of each pilot control unit 2, and the second regulating interfaces 204 of a pair of pilot control units 2 are interconnected to form a second oil circuit; the pilot valve also includes: a second regulating valve 4 and two second one-way valves 5, the second regulating valve 4 is arranged on the second oil circuit, and is used to adjust the oil flow and pressure in the second oil circuit; the first oil circuit and the second oil circuit are also respectively provided with a second one-way valve 5, and the second one-way valve 5 is used to control the oil flow direction on the corresponding first oil circuit or the second oil circuit, wherein the oil flow directions in the first oil circuit and the second oil circuit are opposite. The second regulating valve 4 is a throttle valve. The oil flow direction on the corresponding oil circuit is controlled by the second regulating valve 4 and the first regulating valve 3, and the impact borne by the two pilot control units 2 is more accurately distributed, and the valve core openings of the second regulating valve 4 and the first regulating valve 3 may be different.

[0041] On the other hand, the present invention provides a hydraulic resistance buffer control pilot system, comprising: a return oil tank, multiple groups of hydraulic resistance buffer control pilot valves as described in any of the above items, multiple groups of main valves 1 and multiple groups of connecting valve groups 6, each of the pilot valves is correspondingly connected to a pair of main valve pilot working oil ports of the corresponding main valve 1, a connecting oil circuit is arranged between every two pilot valves, and a group of connecting valve groups 6 is arranged on each connecting oil circuit, and the connecting valve group 6 is used to control the oil flow direction between the corresponding two pilot valves.

[0042] In one embodiment, a hydraulic resistance buffer control pilot system, one pilot valve is connected to the main valve pilot oil circuit that controls the swing link of the excavator, and the other pilot valve is connected to the main valve pilot oil circuit that controls the boom link of the excavator. For safety in use, in actual operation of the excavator, the boom link usually moves before the swing link. In order to control the movement sequence of the boom and the swing in the excavator, such as Figure 3 As shown, a connecting valve group 6 is provided on the connecting circuit between the boom connection and the slewing connection to control the flow direction of the oil, thereby controlling the action sequence of the boom connection and the slewing connection. The connecting valve group 6 includes: a third one-way valve 61, which is provided on the connecting oil circuit between the corresponding two pilot valves, and is used to control the flow direction of the oil on the corresponding connecting oil circuit. The third one-way valve 61 is used to control the oil to flow from the boom connection to the slewing connection. In this way, in actual operation, after the boom of the excavator is controlled to move, the oil flows from the boom connection to the slewing connection, thereby controlling the action of the boom connection to be prior to the action of the slewing connection. In order to ensure that the oil is buffered during the flow process, the connecting valve group 6 also includes: a second throttle valve 62, which is provided on the connecting oil circuit between the corresponding two pilot valves, and is used to adjust the oil flow and pressure on the corresponding connecting oil circuit. The second throttle valve 62 is used to control the oil flow and pressure on the connecting oil circuit, thereby playing a buffering and throttling role on the oil flowing through the connecting oil circuit.

[0043] In yet another aspect, the present invention provides an engineering machine, wherein the engineering machine comprises any one of the above-mentioned hydraulic resistance buffer control pilot systems.

[0044] The hydraulic resistance buffer control pilot valve provided by the present invention is connected with a pair of main valve pilot working oil ports through a pair of pilot control units of the pilot valve, that is, the pilot working oil port of each pilot control unit is connected with a corresponding main valve pilot working oil port, and the oil flow direction is controlled by a first one-way valve arranged on the oil circuit between the pilot oil inlet and the pilot working oil port. The oil enters the pilot control unit from the pilot oil inlet, and is divided into two paths after passing through the first one-way valve. One path flows through the main valve pilot working oil port and enters a side cavity of the main valve and acts on the valve core of the main valve to push the main valve. The valve core moves, and the movement of the valve core causes the oil in the cavity on the other side of the main valve to flow out from the other main valve pilot working oil port of the main valve, and the outflowing oil returns to the oil after passing through the proportional throttle valve of another pilot control unit. The proportional throttle valve can adjust the return oil pressure according to the oil pressure of the oil entering from its oil inlet, thereby buffering the oil pressure in the pilot working oil circuit of the pilot valve and the main valve, improving the buffer response time, reducing impact and oil consumption, and the other oil flowing out of the first one-way valve returns to the oil after passing through the proportional throttle valve of the pilot control unit where it is located, thereby buffering the oil pressure in the oil circuit where the pilot control unit is located.

[0045] The hydraulic resistance buffer control pilot valve, hydraulic resistance buffer control pilot system and engineering machinery provided by the present invention respectively connect a pilot control unit of a pilot valve to a pair of main valve pilot working oil ports of the main valve, so as to buffer the oil pressure on the oil circuit where the pilot control unit is located through the corresponding pilot control unit, thereby solving the problem of poor buffering effect of the buffer damping joint in the pilot working oil circuit connecting the pilot valve and the main valve in the prior art.

[0046] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0047] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0048] Those skilled in the art will understand that all or part of the steps in the method for implementing the above-mentioned embodiments can be completed by instructing the relevant hardware through a program, and the program is stored in a storage medium, including several instructions for making a single-chip microcomputer, a chip or a processor (processor) perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0049] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the embodiments of the present invention, they should also be regarded as the contents disclosed in the embodiments of the present invention.

Claims

1. A hydraulic resistance buffer control pilot valve, connected to the oil return tank and to a pair of main valve pilot working oil ports of a main valve (1), It is characterized in that The pilot valve comprises: a pair of pilot control units (2) correspondingly connected to a pair of main valve pilot working oil ports of the main valve (1); Each pilot control unit (2) comprises: a valve body (20), a first non-return valve (21), and a proportional throttle valve (23); the proportional throttle valve (23) comprises a throttle valve, and the valve core opening of the throttle valve is determined by the oil pressure from the oil inlet of the proportional throttle valve (23); the valve body (20) has a pilot oil inlet and outlet (201) and a pilot working oil port (202); the oil inlet of the first non-return valve (21) is connected to the pilot oil inlet and outlet (201), the oil outlet of the first non-return valve (21) is connected to the pilot working oil port (202), the pilot working oil port (202) is connected to a corresponding pilot working oil port of a main valve, the oil inlet and the regulating oil port of the proportional throttle valve (23) are connected to the oil outlet of the first non-return valve (21), and the oil outlet and the oil discharge port of the proportional throttle valve (23) are both connected to the oil return tank; Each pilot control unit (2) further comprises: a first throttle valve (22) arranged between the first one-way valve (21) and the proportional throttle valve (23), the oil inlet of the first throttle valve (22) being in communication with the oil outlet of the first one-way valve (21), and the oil outlet of the first throttle valve (22) being in communication with the oil inlet and regulating oil outlet of the proportional throttle valve (23); A first regulating interface (203) is also provided on the valve body (20) of each pilot control unit (2), and the first regulating interfaces (203) of a pair of pilot control units (2) are interconnected to form a first oil circuit; The pilot valve further comprises: a first regulating valve (3), wherein the first regulating valve (3) is arranged in the first oil circuit and is used for regulating the oil flow and pressure in the first oil circuit.

2. The hydraulic resistance buffer control pilot valve according to claim 1, It is characterized in that The first regulating valve (3) is a throttle valve.

3. The hydraulic resistance buffer control pilot valve according to claim 2, It is characterized in that A second regulating interface (204) is also provided on the valve body (20) of each pilot control unit (2), and the second regulating interfaces (204) of a pair of pilot control units (2) are interconnected to form a second oil circuit; The pilot valve further comprises: a second regulating valve (4) and two second one-way valves (5); the second regulating valve (4) is arranged on the second oil circuit and is used to regulate the oil flow and pressure in the second oil circuit; The first oil circuit and the second oil circuit are also provided with a second one-way valve (5) respectively, and the second one-way valve (5) is used to control the flow direction of the oil in the corresponding first oil circuit or second oil circuit, wherein the flow direction of the oil in the first oil circuit and the second oil circuit are opposite.

4. The hydraulic resistance buffer control pilot valve according to claim 3, It is characterized in that The second regulating valve (4) is a throttle valve.

5. A hydraulic resistance buffer control pilot system, It is characterized in that include: A return oil tank, a plurality of groups of hydraulic buffer control pilot valves as described in any one of claims 1 to 4, a plurality of groups of main valves (1) and a plurality of groups of connecting valve groups (6), each of the pilot valves being connected to a pair of main valve pilot working oil ports of the corresponding main valve (1), a connecting oil circuit being provided between each two pilot valves, and a group of connecting valve groups (6) being provided on each connecting oil circuit, and the connecting valve group (6) being used to control the oil flow direction between the corresponding two pilot valves.

6. The hydraulic resistance buffer control pilot system according to claim 5, It is characterized in that The connecting valve group (6) comprises a third one-way valve (61), which is arranged on the connecting oil circuit between the corresponding two pilot valves and is used to control the flow direction of oil on the corresponding connecting oil circuit.

7. The hydraulic resistance buffer control pilot system according to claim 6, It is characterized in that The connecting valve group (6) further comprises: a second throttle valve (62), which is arranged on the connecting oil circuit between the corresponding two pilot valves and is used to adjust the oil flow and pressure on the corresponding connecting oil circuit.

8. A construction machine, It is characterized in that The engineering machinery includes the hydraulic resistance buffer control pilot system as described in any one of claims 5-7.

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