Hydraulic reversing valve with position detection function and hydraulic system

Abstract

The utility model discloses a hydraulic reversing valve with a position detection function and a hydraulic system. The hydraulic reversing valve comprises a hollow valve body, a valve rod, a first end cover, a second end cover and a displacement sensor. The valve body is provided with a plurality of oil ports; the valve rod is installed in the valve body and can move in the valve body in the axial direction, and different oil passing modes are achieved. The first end cover is installed at one axial end of the valve body, and a limiting component used for limiting the axial running stroke of the valve rod is installed in the first end cover. The second end cover is mounted at the other axial end part of the valve body; the displacement sensor is installed on the second end cover, makes direct contact with the valve rod and is used for detecting the position of the valve rod and transmitting the position outwards through the connector, and therefore the working state of the whole valve is detected. The hydraulic reversing valve is simple in structure, low in cost, safe, reliable and convenient to maintain and replace in the later period, and a new choice is provided for a hydraulic system designer when the hydraulic reversing valve is selected.

Description

Technical Field

[0001] The utility model relates to a hydraulic reversing valve with a position detection function, belonging to the technical field of hydraulic reversing valves. Background Art

[0002] With the development of hydraulic fault diagnosis technology, engineering machinery hosts are usually equipped with some sensors to detect the parameters of hydraulic components. Displacement sensors have been widely used due to their high precision and high economy. For reversing valves, due to the poor working environment of engineering machinery, the hydraulic system is easily contaminated and valve jamming failures are prone to occur. Some operating conditions require measuring the formation of the valve stem to perform related fault diagnosis. In addition, there are some high-precision control occasions that require the valve stem to match the control signal in real time and the valve stem position signal to be output.

[0003] The existing hydraulic reversing valves have the following disadvantages: the hydraulically controlled reversing valves do not have a position detection function, and when the valve stem cannot switch normally, it can only be judged by abnormalities in the subsequent working system. There is no fast and reliable detection method, which poses a great safety hazard. This patent directly adopts the form of adding a displacement sensor in the direction of the valve stem movement of the hydraulic reversing valve, integrating the sensor on the entire valve, and realizing the valve stem position detection function. The solution has a simple structure and strong versatility.

[0004] The existing patent (authorization announcement number CN220770204U) discloses an electro-hydraulic reversing valve with a position detection function. This technology has the following shortcomings:

[0005] The patent mentions that the electromagnetic reversing valve is set on the valve body. When the electromagnetic reversing valve loses power, the valve stem is in the middle position. When the left or right side of the electromagnetic reversing valve is powered on, the oil pressure causes the valve stem to move to the right or left, changing the flow of oil in the oil channel in the valve body to cause the valve stem to change direction, thereby achieving the reversal of the control actuator. The control method of the reversing valve with this structure is electromagnetic control, which cannot be used in situations where a hydraulically controlled reversing valve is required. Summary of the invention

[0006] In view of the deficiencies of the prior art, the utility model provides a hydraulic reversing valve with a position detection function, which controls the valve stem reversing through external pilot oil to achieve different oil flow modes. The displacement sensor is integrated on the entire valve and connected to the valve stem to monitor the valve stem position information in real time and transmit it to the outside through the interface to detect the working state of the entire valve. The hydraulic reversing valve has a simple structure, low cost, safety and reliability, and is convenient for later maintenance and replacement, providing a new choice for hydraulic system designers when selecting hydraulic reversing valves.

[0007] The utility model is implemented according to the following technical solutions:

[0008] In a first aspect, the utility model provides a hydraulic reversing valve with a position detection function, comprising:

[0009] The hollow valve body is provided with multiple oil ports;

[0010] A valve stem is installed in the valve body, and the valve stem can move axially in the valve body to achieve different oil flow modes;

[0011] A first end cover is mounted on an axial end of the valve body, wherein a limiting component for limiting the axial running stroke of the valve stem is installed in the first end cover;

[0012] A second end cover, mounted on the other axial end of the valve body;

[0013] A displacement sensor is mounted on the second end cover and is in direct contact with the valve stem, and is used to detect the position of the valve stem.

[0014] In some embodiments, the limiting component includes:

[0015] A spring, sleeved on the valve stem located in the first end cover;

[0016] Gasket I and gasket II are respectively mounted on the valve stem at both ends of the spring. Under the elastic force of the spring, gasket II is pressed against the axial surface of the valve body, and gasket I is pressed against the step of the first end cover.

[0017] Nut, installed at the end of the valve stem located at gasket I;

[0018] The limit sleeve is mounted on the valve stem located in the spring, and the gap between the two is matched; when the valve stem moves to the left, the step on the valve stem pushes gasket II to compress the spring until the limit sleeve contacts gaskets I and gaskets II; when the valve stem moves to the right, the nut pushes gasket I to compress the spring until the limit sleeve contacts gaskets I and gaskets II.

[0019] In some embodiments, the axial contact surface between the first end cover and the valve body and the axial contact surface between the second end cover and the valve body are both installed with sealing components.

[0020] In some embodiments, the sealing component is an O-ring; the first end cover and the second end cover are both provided with an O-groove on the axial surface facing the valve body, and the O-ring is installed in the O-groove; or, the valve body is both provided with an O-groove on the axial surface facing the first end cover and the second end cover, and the O-ring is installed in the O-groove.

[0021] In some embodiments, the first end cover and the second end cover are both provided with a plurality of axial through holes, and the axial surfaces on both sides of the valve body are both provided with threaded holes coaxially arranged with the axial through holes, and the first end cover and the second end cover are fixed to the valve body by a plurality of axial screws.

[0022] In some embodiments, an axial internal threaded through hole is provided in the second end cover, and an external thread is provided on the radial circumferential surface of the displacement sensor, and the two are fixed together by tightening the internal and external threads.

[0023] In some embodiments, the valve body is provided with a K1 port and a K2 port, and the K1 port and the K2 port are control oil ports, which provide control oil to the inner cavities of the first end cover and the second end cover respectively. The control oil acts on both ends of the valve stem respectively, and the valve stem moves left and right by overcoming the elastic force of the spring on the valve stem.

[0024] In some embodiments, the valve body is also provided with a P port used as an oil inlet, an A port and a B port used as a working oil port, and a T port used as an oil outlet. The relative movement of the valve stem with respect to the valve body can realize the opening and closing of the oil circuits of the P port, T port, A port, and B port, or change the direction of the liquid flow.

[0025] In a second aspect, the utility model provides a hydraulic system, including the above-mentioned hydraulic reversing valve with position detection function.

[0026] Compared with the prior art, the utility model has the following beneficial effects:

[0027] 1. With position detection function: the sensor is integrated into the whole valve to realize the valve stem position detection function;

[0028] 2. Low cost: The product has a simple structure and uses a relatively mature displacement sensor, which has low cost and high reliability;

[0029] 3. Strong expandability: The product is modularly designed. The position detection function can be cancelled by replacing the end cover, which is convenient for designers to choose according to different working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation on the present invention. Obviously, the accompanying drawings described below are only some embodiments. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0031] In the attached picture:

[0032] Figure 1 This is a front view of the hydraulic reversing valve with position detection function of the utility model;

[0033] Figure 2 This is a cross-sectional view of a hydraulic reversing valve with a position detection function of the utility model;

[0034] Figure 3It is a rear view of the hydraulic reversing valve with position detection function of the utility model.

[0035] Figure identification: 1-first end cover, 2-screw, 3-screw, 4-valve body, 5-second end cover, 6-displacement sensor, 7-nut, 8-washer, 9-gasket I, 10-limiting sleeve, 11-spring, 12-O-ring, 13-valve stem, 14-gasket II.

[0036] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. The following embodiments are used to illustrate the utility model but are not used to limit the scope of the utility model.

[0038] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0039] In the description of the present invention, 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 a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] like Figure 1 , Figure 2 , Figure 3As shown, a hydraulic reversing valve with a position detection function includes a hollow valve body 4, a valve stem 13, a first end cover 1, a second end cover 5 and a displacement sensor 6; the valve body 4 is provided with a plurality of oil ports; the valve stem 13 is installed in the valve body 4, and the valve stem 13 can move axially in the valve body 4 to realize different oil passage modes; the first end cover 1 is installed at an axial end of the valve body 4, and a limiting component for limiting the axial running stroke of the valve stem 13 is installed in the first end cover 1; the second end cover 5 is installed at the other axial end of the valve body 4; the displacement sensor 6 is installed on the second end cover 5, in direct contact with the valve stem 13, and is used to detect the position of the valve stem 13.

[0041] The above-mentioned limiting component is further described below.

[0042] like Figure 2 As shown, the limiting component includes a spring 11, a gasket I9, a gasket II14, a nut 7 and a limiting sleeve 10; the spring 11 is sleeved on the valve stem 13 located in the first end cover 1; the gasket I9 and the gasket II14 are respectively sleeved on the valve stem 13 located at both ends of the spring 11, and under the elastic force of the spring 11, the gasket II14 is pressed against the axial surface of the valve body 4, and the gasket I9 is ​​pressed against the step of the first end cover 1; the nut 7 and the washer 8 are installed at the end of the valve stem 13 located at the gasket I9; the limiting sleeve 10 is sleeved on the valve stem 13 located in the spring 11, and the gap between the two is matched; when the valve stem 13 moves to the left, the step on the valve stem 13 pushes the gasket II14 to compress the spring 11 until the limiting sleeve 10 contacts the gasket I9 and the gasket II14; when the valve stem 13 moves to the right, the nut 7 pushes the gasket I9 to compress the spring 11 until the limiting sleeve 10 contacts the gasket I9 and the gasket II14.

[0043] Further solutions, such as Figure 2 As shown, the axial contact surface between the first end cover 1 and the valve body 4 and the axial contact surface between the second end cover 5 and the valve body 4 are both installed with sealing components.

[0044] The preferred solution is Figure 2 As shown, the sealing component is an O-ring 12; the first end cover 1 and the second end cover 5 are both provided with O-grooves on the axial surfaces facing the valve body 4, and the O-ring 12 is installed in the O-grooves; or, the valve body 4 is both provided with O-grooves on the axial surfaces facing the first end cover 1 and the second end cover 5, and the O-ring 12 is installed in the O-grooves.

[0045] Further solutions, such as Figure 1 As shown, the first end cover 1 and the second end cover 5 are both provided with a plurality of axial through holes, and the axial surfaces on both sides of the valve body 4 are both provided with threaded holes coaxially arranged with the axial through holes, and the first end cover 1 and the second end cover 5 are fixed to the valve body 4 by a plurality of axial screws 2.

[0046] Further solutions, such as Figure 2As shown, an axial internal threaded through hole is provided in the second end cover 5, and an external thread is provided on the radial circumferential surface of the displacement sensor 6, and the two are fixed together by tightening the internal and external threads.

[0047] Further solutions, such as Figure 3 As shown, the valve body 13 is provided with a K1 port and a K2 port, which are control oil ports, respectively providing control oil to the inner cavity of the first end cover 1 and the second end cover 5, and the control oil acts on the two ends of the valve stem 13, respectively, and the valve stem 13 moves left and right by overcoming the elastic force of the spring 11 on the valve stem 13. The valve body 4 is also provided with a P port used as an oil inlet, an A port and a B port used as working oil ports, and two T ports used as oil outlets. The relative movement of the valve stem 13 relative to the valve body 4 is used to realize the opening and closing of the oil circuits of the P port, the T port, the A port, and the B port, or change the direction of the liquid flow.

[0048] The utility model also provides a hydraulic system, including the above-mentioned hydraulic reversing valve with position detection function. The hydraulic reversing valve is fixed on other components of the hydraulic system by screws 3, and ports K1, K2, P, T, A and B are connected to the oil circuits corresponding to other components of the hydraulic system. The displacement sensor 6 detects the position signal of the valve stem in real time, converts the position signal into an electrical signal, and outputs the electrical signal through the connection port.

[0049] In summary, the utility model provides a hydraulic reversing valve with a position detection function, which controls the reversing of the valve stem through external pilot oil to achieve different oil flow modes. The displacement sensor is integrated on the entire valve and connected to the valve stem to monitor the position information of the valve stem in real time and transmit it to the outside through the interface to detect the working state of the entire valve. The hydraulic reversing valve has a simple structure, low cost, safety and reliability, and is convenient for later maintenance and replacement, providing a new choice for hydraulic system designers when selecting hydraulic reversing valves.

[0050] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0051] In addition, those skilled in the art will understand that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments also means being within the scope of protection of the present utility model and forming different embodiments. For example, in the above embodiments, those skilled in the art can use them in combination according to the known technical solutions and the technical problems to be solved by the present application.

[0052] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Although the utility model has been disclosed as a preferred embodiment as above, it is not used to limit the utility model. Any technician familiar with this patent can make some changes or modify the technical content suggested above into an equivalent embodiment with equivalent changes without departing from the scope of the technical solution of the utility model. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the utility model without departing from the content of the technical solution of the utility model still falls within the scope of the solution of the utility model.

Claims

1. A hydraulic reversing valve with position detection function, characterized in that: include: The hollow valve body is provided with multiple oil ports; A valve stem is installed in the valve body, and the valve stem can move axially in the valve body to achieve different oil flow modes; A first end cover is mounted on an axial end of the valve body, wherein a limiting component for limiting the axial running stroke of the valve stem is installed in the first end cover; A second end cover, mounted on the other axial end of the valve body; A displacement sensor is mounted on the second end cover and is in direct contact with the valve stem, and is used to detect the position of the valve stem.

2. A hydraulic reversing valve with position detection function according to claim 1, characterized in that: The limiting component comprises: A spring, sleeved on the valve stem located in the first end cover; Gasket I and gasket II are respectively mounted on the valve stem at both ends of the spring. Under the elastic force of the spring, gasket II is pressed against the axial surface of the valve body, and gasket I is pressed against the step of the first end cover. Nut, installed at the end of the valve stem located at gasket I; The limit sleeve is mounted on the valve stem located in the spring, and the gap between the two is matched; when the valve stem moves to the left, the step on the valve stem pushes gasket II to compress the spring until the limit sleeve contacts gaskets I and gaskets II; when the valve stem moves to the right, the nut pushes gasket I to compress the spring until the limit sleeve contacts gaskets I and gaskets II.

3. A hydraulic reversing valve with position detection function according to claim 1, characterized in that: The axial contact surface between the first end cover and the valve body and the axial contact surface between the second end cover and the valve body are both installed with sealing components.

4. A hydraulic reversing valve with position detection function according to claim 3, characterized in that: The sealing component is an O-ring; The first end cover and the second end cover are both provided with O-shaped grooves on the axial surfaces facing the valve body, and O-rings are installed in the O-shaped grooves; or, the valve body is both provided with O-shaped grooves on the axial surfaces facing the first end cover and the second end cover, and O-rings are installed in the O-shaped grooves.

5. The hydraulic reversing valve with position detection function according to claim 1, characterized in that: The first end cover and the second end cover are both provided with a plurality of axial through holes, and the axial surfaces on both sides of the valve body are both provided with threaded holes coaxially arranged with the axial through holes, and the first end cover and the second end cover are fixed to the valve body by a plurality of axial screws.

6. The hydraulic reversing valve with position detection function according to claim 1, characterized in that: An axial internal threaded through hole is provided in the second end cover, and an external thread is provided on the radial circumferential surface of the displacement sensor, and the two are fixed together by tightening the internal and external threads.

7. The hydraulic reversing valve with position detection function according to claim 1, characterized in that: The valve body is provided with a K1 port and a K2 port, which are control oil ports and provide control oil to the inner cavities of the first end cover and the second end cover respectively. The control oil acts on the two ends of the valve stem respectively, and the valve stem moves left and right by overcoming the elastic force of the spring on the valve stem.

8. The hydraulic reversing valve with position detection function according to claim 7, characterized in that: The valve body is also provided with a P port used as an oil inlet, an A port and a B port used as working oil ports, and a T port used as an oil outlet. The relative movement of the valve stem with respect to the valve body is utilized to open or close the oil paths of the P port, T port, A port, and B port, or to change the direction of the liquid flow.

9. A hydraulic system, characterized in that: A hydraulic reversing valve with a position detection function comprising any one of claims 1 to 8.

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