Multi-way valve group, hydraulic system and engineering machinery

Abstract

The utility model relates to the technical field of engineering machinery, in particular to a multi-way valve group, a hydraulic system and engineering machinery, the multi-way valve group comprises: an overflow valve, which is respectively connected with an oil inlet and an oil return port of the multi-way valve group and is used for limiting the oil pressure difference between the oil inlet and the oil return port within a first oil pressure range; the proportional pressure reducing valve is connected with a first working oil port of the multi-way valve group; the three-way pressure reducing valve is respectively connected with the proportional pressure reducing valve, the oil inlet and the oil return port; the first reversing valve is respectively connected with the second working oil port, the oil inlet and the oil return port of the multi-way valve group; the overflow valve, the proportional pressure reducing valve, the three-way pressure reducing valve and the first reversing valve are integrated in the valve group body. According to the multi-way valve group, the hydraulic system and the engineering machinery, the overflow valve, the proportional pressure reducing valve, the three-way pressure reducing valve and the first reversing valve are integrated, so that the integration level can be improved, and the space utilization rate is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of engineering machinery, in particular to a multi-way valve group, a hydraulic system and engineering machinery. Background Art

[0002] The brake can be used to brake the construction machinery, and the rocker arm can be raised and lowered by the rocker arm adjustment cylinder. The brake is usually connected to the brake valve group, and the rocker arm adjustment cylinder is usually connected to the rocker arm control valve group. The brake valve group obtains hydraulic oil from the rocker arm control valve group.

[0003] In the related art, since the brake valve group obtains hydraulic oil from the rocker control valve group, the brake valve group will be affected by the rocker control valve group, and abnormal operation of the rocker control valve group will cause the brake valve group to fail to work properly. In addition, in the related art, the brake valve group and the rocker control valve group are not integrated into the same valve group body, resulting in a low integration problem.

[0004] Therefore, it is urgent to design a multi-way valve group, a hydraulic system and an engineering machinery that can solve the technical problem of low integration. Utility Model Content

[0005] The utility model aims to solve at least one of the technical problems existing in the prior art or related technology.

[0006] To this end, the utility model provides a multi-way valve group, which can improve the integration degree and space utilization by integrating a relief valve, a proportional pressure reducing valve, a three-way pressure reducing valve and a first reversing valve.

[0007] The utility model also provides a hydraulic system comprising the multi-way valve group, and an engineering machine comprising the multi-way valve group or the hydraulic system.

[0008] According to an embodiment of the first aspect of the utility model, a multi-way valve group is provided, comprising: a relief valve, respectively connected to the oil inlet and oil return port of the multi-way valve group, for limiting the oil pressure difference between the oil inlet and the oil return port to a first oil pressure range; a proportional pressure reducing valve, connected to the first working oil port of the multi-way valve group; a three-way pressure reducing valve, respectively connected to the proportional pressure reducing valve, the oil inlet and the oil return port; a first reversing valve, respectively connected to the second working oil port, the oil inlet and the oil return port of the multi-way valve group; a valve group body, the relief valve, the proportional pressure reducing valve, the three-way pressure reducing valve and the first reversing valve are integrated in the valve group body.

[0009] Optionally, the multi-way valve group further includes: a pressure relay connected to the first working oil port, and configured to generate an electrical signal when the pressure of the hydraulic oil flowing to the first working oil port is lower than a pressure threshold.

[0010] Optionally, the multi-way valve group also includes: a flow valve, which is respectively connected to the oil inlet and the oil return port, and is used to adjust the flow of hydraulic oil flowing from the oil inlet into the multi-way valve group; a first-link pressure reducing valve, which is respectively connected to the oil inlet and the oil return port, and a first pressure gauge is connected between the oil inlet and the first-link pressure reducing valve, and the first-link pressure reducing valve is used to limit the oil pressure difference between the oil inlet and the oil return port to a second oil pressure range; the flow valve and the first-link pressure reducing valve are integrated in the valve group body.

[0011] Optionally, the multi-way valve group further includes: a second reversing valve, which is respectively connected to the third working oil port, the oil inlet port and the oil return port of the multi-way valve group; and the second reversing valve is integrated in the valve group body.

[0012] Optionally, a second pressure gauge is connected between the proportional pressure reducing valve and the three-way pressure reducing valve.

[0013] A hydraulic system according to an embodiment of the second aspect of the utility model includes the multi-way valve group in the first aspect or its various implementation methods, and also includes: an oil tank for storing hydraulic oil and connected to the return oil port of the multi-way valve group; a pump motor assembly, including an oil pump motor and an oil pump, the oil pump motor is connected to the oil pump, the oil pump is respectively connected to the oil tank and the oil inlet of the multi-way valve group, the oil pump motor is used to drive the oil pump to transport the hydraulic oil in the oil tank to the multi-way valve group; a brake, connected to the first working oil port of the multi-way valve group, and used for braking the engineering machinery based on hydraulic oil.

[0014] Optionally, the hydraulic system also includes: a left height adjustment cylinder connected to the second working oil port of the multi-way valve group; and a right height adjustment cylinder connected to the third working oil port of the multi-way valve group.

[0015] Optionally, the hydraulic system also includes: an air filter connected to the oil tank.

[0016] Optionally, the hydraulic system also includes: a liquid level meter, arranged in the oil tank, for monitoring the hydraulic oil height in the oil tank.

[0017] An engineering machinery according to an embodiment of the third aspect of the utility model includes the multi-way valve group in the first aspect or its various implementations, or includes the hydraulic system in the second aspect or its various implementations.

[0018] One of the above technical solutions has at least the following advantages or beneficial effects:

[0019] For a multi-way valve group in an embodiment of the utility model, the overflow valve, the proportional pressure reducing valve, the three-way pressure reducing valve and the first reversing valve can be integrated. The proportional pressure reducing valve is connected to the first working oil port, and the first reversing valve is connected to the second working oil port. Through the integrated structure, the integration degree can be improved and the space utilization rate can be increased. The oil pressure difference can be limited by the overflow valve, thereby enhancing the safety of the multi-way valve group. Through the three-way pressure reducing valve, the hydraulic oil can flow into the proportional pressure reducing valve and return to the return oil port, thereby realizing the circulation of the hydraulic oil and improving the adaptability to the scene.

[0020] The hydraulic system provided by the embodiment of the utility model is provided with the multi-way valve group mentioned above. Since the multi-way valve group has the above-mentioned technical effects, the hydraulic system provided with the multi-way valve group should also have corresponding technical effects.

[0021] The engineering machinery provided by the embodiment of the utility model is provided with the multi-way valve group mentioned above. Since the multi-way valve group has the above-mentioned technical effects, the engineering machinery provided with the multi-way valve group should also have corresponding technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the structure of a multi-way valve group according to an embodiment of the present invention is shown;

[0023] Figure 2 A schematic diagram of the structure of a hydraulic system of an embodiment provided by the utility model is shown.

[0024] Description of reference numerals:

[0025] 100-multi-way valve group; 110-overflow valve; 120-proportional pressure reducing valve; 130-three-way pressure reducing valve; 140-first reversing valve; 150-pressure relay; 160-flow valve; 170-first pressure reducing valve; 180-first pressure gauge; 190-second reversing valve; 200-second pressure gauge; 300-brake; 310-oil tank; 321-oil pump motor; 322-oil pump; 331-left height adjustment cylinder; 332-right height adjustment cylinder; 340-air filter; 350-liquid level gauge; P-oil inlet; R-oil return port; A-first working oil port; B-second working oil port; C-third working oil port. DETAILED DESCRIPTION

[0026] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below in conjunction with the accompanying drawings through specific implementation methods. The directional terms such as "upper" and "lower" mentioned herein are referenced to the orientation of the three-dimensional coordinate system formed by the X-axis, the Y-axis and the Z-axis. For example, the Z-axis direction is taken as the vertical direction.

[0027] As mentioned above, in the study of engineering machinery, especially the hydraulic system of engineering machinery, it was found that the brake can be controlled by the brake valve group, and the rocker arm adjustment cylinder can be controlled by the rocker arm control valve group. Since the brake valve group obtains hydraulic oil from the rocker arm control valve group, abnormal operation of the rocker arm control valve group will cause abnormal operation of the brake valve group. The brake valve group and the rocker arm control valve group that are not integrated in the same valve group body will also bring about the problem of low integration. In the process of implementing engineering machinery, the rocker arm control valve group and the brake valve group are distributed on both sides of the engineering machinery. It is necessary to set an oil supply line and filter for the rocker arm control valve group, and set an oil supply line and filter for the brake valve group, which will take up relatively more space and bring difficulties to maintenance work.

[0028] In order to solve at least one of the technical problems existing in the prior art or related technology, the utility model provides a multi-way valve group, a hydraulic system and an engineering machine. Figure 1 and Figure 2 To describe the multi-way valve group, hydraulic system and engineering machinery according to some embodiments of the utility model.

[0029] See also Figure 1 According to an embodiment provided by the utility model, a multi-way valve group 100 is provided, including: a relief valve 110, which is respectively connected to the oil inlet P and the oil return port R of the multi-way valve group 100, and is used to limit the oil pressure difference between the oil inlet P and the oil return port R to a first oil pressure range; a proportional pressure reducing valve 120, which is connected to the first working oil port A of the multi-way valve group 100; a three-way pressure reducing valve 130, which is respectively connected to the proportional pressure reducing valve 120, the oil inlet P and the oil return port R; a first reversing valve 140, which is respectively connected to the second working oil port B, the oil inlet P and the oil return port R of the multi-way valve group 100; a valve group body, in which the relief valve 110, the proportional pressure reducing valve 120, the three-way pressure reducing valve 130 and the first reversing valve 140 are integrated.

[0030] It should be noted that the proportional pressure reducing valve 120 can be used to reduce the pressure of the hydraulic oil flowing to the first working oil port A to reduce or even avoid damage to the equipment connected to the first working oil port A. The three-way pressure reducing valve 130 can reduce the pressure of the hydraulic oil flowing to the proportional pressure reducing valve 120 to reduce or even avoid damage to the proportional pressure reducing valve 120. The multi-way valve group 100 can also be called a load-sensitive multi-way reversing valve. The overflow valve 110 can be located at the first joint of the multi-way valve group 100, and the proportional pressure reducing valve 120 and the three-way pressure reducing valve 130 can be located at the last joint of the multi-way valve group 100. The first reversing valve 140 can be located in the middle joint of the multi-way valve group 100, and specifically, the first reversing valve 140 can be located in the first middle joint of the multi-way valve group 100.

[0031] In the exemplary embodiment, the valve group body of the multi-way valve group 100 integrates a relief valve 110, a proportional pressure reducing valve 120, a three-way pressure reducing valve 130 and a first reversing valve 140. The proportional pressure reducing valve 120 is connected to the first working oil port A, and the first reversing valve 140 is connected to the second working oil port B. The first working oil port A and the second working oil port B can be independent of each other, achieving a relatively high degree of integration, reducing space occupation, reducing the cost required for setting up additional oil supply pipelines and additional filters, and reducing maintenance difficulty. In addition, since the oil pressure difference is limited by the relief valve 110, the safety of the multi-way valve group 100 is further improved; the proportional pressure reducing valve 120 can realize stepless adjustment of the hydraulic oil pressure, and has the advantage of flexible adjustment; the three-way pressure reducing valve 130 can slow down the temperature rise of the hydraulic oil, and improve stability and safety.

[0032] Furthermore, the multi-way valve group 100 also includes: a pressure relay 150, which is connected to the first working oil port A and is used to generate an electrical signal when the pressure of the hydraulic oil flowing to the first working oil port A is lower than the pressure threshold; the pressure relay 150 can be integrated in the valve group body or not.

[0033] In an exemplary embodiment, the pressure sensor can be replaced by the pressure relay 150, thereby improving stability and safety. The generated electrical signal can be used for early warning so that timely measures can be taken to reduce losses. The pressure relay 150 also has the advantage of relatively low cost.

[0034] Furthermore, the multi-way valve group 100 also includes: a flow valve 160, which is respectively connected to the oil inlet P and the oil return port R, and is used to adjust the flow of hydraulic oil flowing from the oil inlet P into the multi-way valve group 100; a first-link pressure reducing valve 170, which is respectively connected to the oil inlet P and the oil return port R, and a first pressure gauge 180 is connected between the oil inlet P and the first-link pressure reducing valve 170, and the first-link pressure reducing valve 170 is used to limit the oil pressure difference between the oil inlet P and the oil return port R within a second oil pressure range; the flow valve 160 and the first-link pressure reducing valve 170 are integrated in the valve group body.

[0035] In the exemplary embodiment, since the flow rate of the hydraulic oil is adjusted by the flow valve 160, especially the flow valve 160 automatically adjusts the flow rate of the hydraulic oil, the stability and safety of the multi-way valve group 100 can be improved. The first oil pressure range and the second oil pressure range in the embodiment can be pre-set respectively. The pressure value can be conveniently checked through the first pressure gauge 180. The hydraulic oil can be decompressed by the first pressure reducing valve 170, and the decompressed hydraulic oil can be used to push the main valve core of the first reversing valve 140 and the main valve core of the second reversing valve 190.

[0036] Furthermore, the multi-way valve group 100 also includes: a second reversing valve 190, which is respectively connected to the third working oil port C, the oil inlet port P and the oil return port R of the multi-way valve group 100; the second reversing valve 190 is integrated in the valve group body.

[0037] In an exemplary embodiment, the second reversing valve 190 may be located in the second middle section of the multi-way valve assembly 100. By providing the second reversing valve 190, the integration degree can be further improved and the space occupation can be reduced.

[0038] Furthermore, a second pressure gauge 200 is connected between the proportional pressure reducing valve 120 and the three-way pressure reducing valve 130 .

[0039] In an exemplary embodiment, the second pressure gauge 200 may be respectively connected to the proportional pressure reducing valve 120 and the three-way pressure reducing valve 130. By providing the second pressure gauge 200, the pressure value can be conveniently checked so as to flexibly adjust the hydraulic oil pressure, thereby improving flexibility.

[0040] In another embodiment, see Figure 2 The multi-way valve group 100 of the exemplary embodiment can be arranged in a hydraulic system, and the hydraulic system also includes: an oil tank 310, which is used to store hydraulic oil and is connected to the return oil port R of the multi-way valve group 100; a pump motor assembly, including an oil pump motor 321 and an oil pump 322, the oil pump motor 321 is connected to the oil pump 322, the oil pump 322 is respectively connected to the oil tank 310 and the oil inlet P of the multi-way valve group 100, the oil pump motor 321 is used to drive the oil pump 322 to transport the hydraulic oil in the oil tank 310 to the multi-way valve group 100; a brake 300, which is connected to the first working oil port A of the multi-way valve group 100, and is used for braking the engineering machinery based on hydraulic oil.

[0041] It should be noted that the engineering machinery in the embodiment may include: a coal mining machine, a tunneling machine, an excavator, a hydraulic support, etc.

[0042] Since the hydraulic system provided in this embodiment has the multi-way valve group 100 provided in any of the above embodiments, the hydraulic system has all the beneficial effects of the multi-way valve group 100 provided in any of the above embodiments, which will not be described in detail here.

[0043] Through the multi-way valve group 100, hydraulic oil can be provided to the brake 300 connected to the first working oil port A to achieve the braking of the engineering machinery. The brake 300 can use the hydraulic oil to control the compression and release of the clutch plate to achieve the parking and movement of the engineering machinery. The three-way pressure reducing valve 130 of the multi-way valve group 100 can reduce or even avoid damage to the brake 300, thereby improving safety and stability.

[0044] Furthermore, the hydraulic system also includes: a left height adjustment cylinder 331 connected to the second working oil port B of the multi-way valve group 100 ; and a right height adjustment cylinder 332 connected to the third working oil port C of the multi-way valve group 100 .

[0045] In an exemplary embodiment, the second working oil port B may include a second working oil outlet B1 and a second working oil return port B2. The second working oil outlet B1 and the second working oil return port B2 may be connected to the left height adjustment cylinder 331, respectively. The third working oil port C may include a third working oil outlet C1 and a third working oil return port C2, and the third working oil outlet C1 and the third working oil return port C2 may be connected to the right height adjustment cylinder 332, respectively. The valve group body of the multi-way valve group 100 integrates the second working oil port B and the third working oil port C, further improving the integration. By integrating, the structure can be simplified, the cost can be reduced, the space utilization rate can be improved, and the failure rate and maintenance difficulty can be reduced.

[0046] Furthermore, the hydraulic system also includes: an air filter 340 connected to the oil tank 310 .

[0047] In an exemplary embodiment, by providing the air filter 340 , dust and other objects entering the oil tank 310 can be reduced, thereby reducing the impact on the hydraulic system.

[0048] Furthermore, the hydraulic system also includes: a liquid level meter 350 , which is arranged in the oil tank 310 and is used to monitor the height of the hydraulic oil in the oil tank 310 .

[0049] In an exemplary embodiment, by providing a liquid level meter 350 , the height of the hydraulic oil in the oil tank 310 can be known so that the hydraulic oil can be replenished in time.

[0050] In another embodiment, the multi-way valve assembly 100 or the hydraulic system of the exemplary embodiment may be disposed in a construction machine.

[0051] Since the engineering machinery provided in this embodiment has the multi-way valve group 100 provided in any of the above embodiments, the engineering machinery has all the beneficial effects of the multi-way valve group 100 provided in any of the above embodiments, which will not be described in detail here.

[0052] In the description of the present utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0053] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like 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 a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0054] In the present utility model, unless otherwise clearly specified and limited, when a first feature is “on” or “below” a second feature, it may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, when a first feature is “above”, “above” or “above” a second feature, it may be that the first feature is directly above or obliquely above the second feature, or it may simply mean that the first feature is higher in level than the second feature. When a first feature is “below”, “below” or “below” a second feature, it may be that the first feature is directly below or obliquely below the second feature, or it may simply mean that the first feature is lower in level than the second feature.

[0055] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "embodiment", "exemplary embodiment", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0056] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A multi-way valve assembly (100), characterized in that: include: A relief valve (110) connected to the oil inlet (P) and the oil return port (R) of the multi-way valve assembly (100) respectively, and used to limit the oil pressure difference between the oil inlet (P) and the oil return port (R) within a first oil pressure range; A proportional pressure reducing valve (120) connected to the first working oil port (A) of the multi-way valve group (100); A three-way pressure reducing valve (130) connected to the proportional pressure reducing valve (120), the oil inlet (P) and the oil return port (R) respectively; A first reversing valve (140) is respectively connected to the second working oil port (B), the oil inlet port (P) and the oil return port (R) of the multi-way valve group (100); The valve group body, the overflow valve (110), the proportional pressure reducing valve (120), the three-way pressure reducing valve (130) and the first reversing valve (140) are integrated in the valve group body.

2. The multi-way valve assembly (100) according to claim 1, characterized in that: Also includes: A pressure relay (150) is connected to the first working oil port (A) and is used to generate an electrical signal when the pressure of the hydraulic oil flowing to the first working oil port (A) is lower than a pressure threshold.

3. The multi-way valve assembly (100) according to claim 1, characterized in that: Also includes: A flow valve (160) connected to the oil inlet (P) and the oil return port (R) respectively, and used for adjusting the flow of hydraulic oil flowing from the oil inlet (P) into the multi-way valve group (100); A first pressure reducing valve (170) is connected to the oil inlet (P) and the oil return port (R) respectively, a first pressure gauge (180) is connected between the oil inlet (P) and the first pressure reducing valve (170), and the first pressure reducing valve (170) is used to limit the oil pressure difference between the oil inlet (P) and the oil return port (R) within a second oil pressure range; The flow valve (160) and the first-link pressure reducing valve (170) are integrated in the valve group body.

4. The multi-way valve assembly (100) according to claim 1, characterized in that: Also includes: The second reversing valve (190) is respectively connected to the third working oil port (C), the oil inlet port (P) and the oil return port (R) of the multi-way valve group (100), and the second reversing valve (190) is integrated in the valve group body.

5. The multi-way valve assembly (100) according to claim 1, characterized in that: A second pressure gauge (200) is connected between the proportional pressure reducing valve (120) and the three-way pressure reducing valve (130).

6. A hydraulic system, characterized in that: include: The multi-way valve assembly (100) according to any one of claims 1 to 5, further comprising: An oil tank (310), used for storing hydraulic oil and connected to the oil return port (R) of the multi-way valve assembly (100); A pump motor assembly, comprising an oil pump motor (321) and an oil pump (322), wherein the oil pump motor (321) is connected to the oil pump (322), and the oil pump (322) is respectively connected to the oil tank (310) and the oil inlet (P) of the multi-way valve assembly (100), and the oil pump motor (321) is used to drive the oil pump (322) to transport the hydraulic oil in the oil tank (310) to the multi-way valve assembly (100); The brake (300) is connected to the first working oil port (A) of the multi-way valve group (100) and is used for braking the engineering machinery based on hydraulic oil.

7. The hydraulic system according to claim 6, characterized in that Also includes: The left height adjustment oil cylinder (331) is connected to the second working oil port (B) of the multi-way valve group (100); The right height adjustment oil cylinder (332) is connected to the third working oil port (C) of the multi-way valve group (100).

8. The hydraulic system according to claim 6, characterized in that: Also includes: An air filter (340) is connected to the oil tank (310).

9. The hydraulic system according to claim 6, characterized in that: Also includes: A liquid level meter (350) is arranged in the oil tank (310) and is used to monitor the height of the hydraulic oil in the oil tank (310).

10. An engineering machine, characterized in that: include: A multi-way valve assembly (100) as claimed in any one of claims 1 to 5, or a hydraulic system as claimed in any one of claims 6 to 9.

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