Load-sensitive water-based proportional reversing valve

Abstract

The invention relates to the technical field of hydraulic control, and provides a load-sensitive type water-based proportional directional valve which comprises a valve body, a first valve element, a second valve element, a first valve element and a second valve element. The main valve element is movably arranged in the valve body, a main valve element hole and a second connector connected with a controlled load are formed in the main valve element, the main valve element hole is connected with the liquid inlet and the second connector, and the second connector is further connected with the liquid return opening; the valve seat is movably arranged in the valve body and is in contact connection with the main valve element, the end, away from the valve body, of the valve seat is connected with the valve body to form a control cavity, and the control cavity communicates with the first connector; when the pilot valve working port selectively communicates with a liquid inlet pipeline or a liquid return pipeline, a working medium in the control cavity can act on the main valve element and the valve seat, so that the second connector selectively communicates with the liquid inlet or the liquid return port, and therefore work of the controlled load is controlled. According to the invention, load-sensitive proportion control can be realized, and the service life of the controlled load is prolonged.

Description

Technical Field

[0001] The present disclosure relates to the field of hydraulic control technology, and in particular to a load-sensitive water-based proportional reversing valve. Background Art

[0002] At present, the switch-type proportional reversing valve is used in coal mining to control the action of the hydraulic support. The switch-type proportional reversing valve has only two working states: "fully open" and "fully closed", that is, the hydraulic support can only move at a constant speed, which is difficult to meet the precise control of the hydraulic support posture and the precise pushing and sliding of the hydraulic support, and it is impossible to achieve the soft start of the hydraulic cylinder, which affects the service life of the hydraulic cylinder, causes the quality of the working face support to decline, affects the straightness of the scraper conveyor, and reduces the service life of the scraper conveyor. In addition, the existing proportional reversing valve has a complex structure and slow response speed, resulting in poor control accuracy. Summary of the invention

[0003] The purpose of the embodiments of the present disclosure is to provide a load-sensitive water-based proportional reversing valve to at least solve the technical problem in the prior art that the proportional reversing valve has poor control accuracy and affects the operation of controlled loads such as hydraulic cylinders.

[0004] In order to solve the above technical problems, the embodiments of the present disclosure adopt the following technical solutions:

[0005] The present disclosure provides a load-sensitive water-based proportional reversing valve, comprising:

[0006] A valve body, wherein the valve body is provided with a liquid inlet, a liquid return port, and a first interface connected to a working port of a pilot valve;

[0007] A main valve core is movably disposed in the valve body, the main valve core is provided with a main valve core hole and a second interface connected to a controlled load, the main valve core hole is connected to the liquid inlet and the second interface respectively, and the second interface is also connected to the liquid return port;

[0008] A valve seat, movably disposed in the valve body and in contact with the main valve core, wherein one end of the valve seat away from the valve body is connected to the valve body to form a control cavity, and the control cavity is communicated with the first interface;

[0009] When the working port of the pilot valve is selectively connected to the liquid inlet pipeline or the liquid return pipeline, the working medium in the control chamber can act on the main valve core and the valve seat, so that the second interface is selectively connected to the liquid inlet or the liquid return port, thereby controlling the operation of the controlled load.

[0010] In some embodiments, the valve seat has a first cross section interacting with the working medium, and the main valve core is provided with a second cross section interacting with the working medium near the liquid inlet, and the cross-sectional area of ​​the first cross section is greater than the cross-sectional area of ​​the second cross section.

[0011] In some embodiments, the liquid return port is opened along the radial direction of the valve body at a position close to the connection between the main valve core and the valve seat, and the liquid inlet and the first interface are respectively located on both sides of the liquid return port along the axial direction of the valve body.

[0012] In some embodiments, a first conical surface is provided at one end of the main valve core facing the valve seat, and a second conical surface matching the first conical surface is provided on the valve seat.

[0013] In some embodiments, the main valve core is provided with a connecting portion extending radially outward, and the connecting portion is arranged between the liquid inlet and the main valve core core hole along the axial direction of the main valve core. The movement of the main valve core can drive the connecting portion to act on the valve body, so that the liquid inlet and the main valve core core hole are connected or disconnected.

[0014] In some embodiments, an end of the connecting portion close to the liquid inlet forms the second cross section.

[0015] In some embodiments, the connecting portion has a taper angle.

[0016] In some embodiments, a step portion is provided at a position of the valve seat close to the liquid return port.

[0017] In some embodiments, an elastic member is further included, and the elastic member is sleeved on the outer circumference of the main valve core and is arranged close to the second interface.

[0018] In some embodiments, the first interface is arranged at an angle.

[0019] The embodiment of the present disclosure provides a load-sensitive water-based proportional reversing valve, wherein a liquid inlet, a liquid return port, and a first interface connected to a pilot valve working port are provided on the valve body, and a main valve core and a valve seat are movably arranged in the valve body, a main valve core core hole and a second interface connected to a controlled load are provided on the main valve core, the main valve core core hole is connected to the liquid inlet and the second interface respectively, and the second interface is also connected to the liquid return port; the valve seat is in contact with the main valve core, and one end of the valve seat away from the valve body is connected to the valve body to form a control chamber, and the control chamber is connected to the first interface; when the pilot valve working port is selectively connected to a liquid inlet pipeline or a liquid return pipeline, the working medium in the control chamber can act on the main valve core and the valve seat, so that the liquid inlet is connected to the main valve core core hole or the second interface is connected to the liquid return port, thereby controlling the operation of the controlled load, realizing load-sensitive proportional control, realizing accurate control and precise pushing and sliding of the hydraulic support posture, and improving the service life of the hydraulic support cylinder and the scraper conveyor. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 It is a schematic structural diagram of a load-sensitive water-based proportional reversing valve according to an embodiment of the present disclosure.

[0022] Reference numerals:

[0023] 1-valve body, 11-liquid inlet, 12-liquid return port, 13-first interface, 14-control chamber; 2-main valve core, 21-main valve core core hole, 22-second interface, 23-second section, 24-first cone surface, 25-connecting part, 251-cone angle; 3-valve seat, 31-first section, 32-second cone surface, 33-step part; 4-elastic part; 101-first flow channel, 102-second flow channel. DETAILED DESCRIPTION

[0024] Various aspects and features of the present disclosure are described herein with reference to the drawings.

[0025] It should be understood that various modifications may be made to the embodiments of the present application. Therefore, the above description should not be considered as limiting, but only as an example of an embodiment. Other modifications within the scope and spirit of the present disclosure will occur to those skilled in the art.

[0026] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the general description of the present disclosure given above and the detailed description of the embodiments given below, serve to explain the principles of the present disclosure.

[0027] These and other characteristics of the present disclosure will become apparent from the following description of a preferred form of embodiment given as a non-limiting example, with reference to the accompanying drawings.

[0028] It should also be understood that, although the present disclosure has been described with reference to some specific examples, those skilled in the art will be able to realize many other equivalent forms of the present disclosure that have the features described in the claims and are therefore within the scope of protection defined thereby.

[0029] The above and other aspects, features and advantages of the present disclosure will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

[0030] Specific embodiments of the present disclosure are described hereinafter with reference to the accompanying drawings; however, it should be understood that the embodiments claimed are merely examples of the present disclosure, which may be implemented in a variety of ways. Well-known and / or repeated functions and structures are not described in detail to avoid obscuring the present disclosure with unnecessary or redundant details. Therefore, the specific structural and functional details claimed herein are not intended to be limiting, but merely serve as a basis and representative basis for the claims to teach those skilled in the art to use the present disclosure in a variety of ways with substantially any suitable detailed structure.

[0031] This specification may use the phrases "in one embodiment," "in another embodiment," "in a further embodiment," or "in other embodiments," all of which may refer to one or more of the same or different embodiments according to the present disclosure.

[0032] Embodiment 1

[0033] Figure 1 FIG. 2 shows a schematic diagram of the structure of a load-sensitive water-based proportional reversing valve according to an embodiment of the present disclosure. Figure 1 As shown, a load-sensitive water-based proportional reversing valve provided in an embodiment of the present disclosure includes:

[0034] A valve body 1, wherein the valve body 1 is provided with a liquid inlet (P port) 11, a liquid return port (T port) 12, and a first interface 13 connected to a working port of a pilot valve;

[0035] A main valve core 2 is movably disposed in the valve body 1, and is provided with a main valve core hole 21 and a second interface (A port) 22 connected to a controlled load, wherein the main valve core hole 21 is connected to the liquid inlet 11 and the second interface 22 respectively, and the second interface 22 is also connected to the liquid return port 12;

[0036] A valve seat 3 is movably disposed in the valve body 1 and is in contact with and connected to the main valve core 2. One end of the valve seat 3 away from the valve body 1 is connected to the valve body 1 to form a control chamber 14. The control chamber 14 is in communication with the first interface 13.

[0037] When the working port of the pilot valve is selectively connected to the liquid inlet pipeline or the liquid return pipeline, the working medium in the control chamber 14 can act on the main valve core 2 and the valve seat 3, so that the second interface 22 is selectively connected to the liquid inlet 11 or the liquid return port 12 to control the operation of the controlled load.

[0038] Specifically, the second interface 22 is arranged at one axial end of the main valve core 2, the main valve core core hole 21 is opened along the circumference of the main valve core 2, and a first flow channel 101 is arranged in the main valve core 2 to connect the main valve core core hole 21 and the second interface 22. The second interface 22 is also connected to the liquid return port 12 through the first flow channel 101. The working medium can be a liquid such as a water-based medium or hydraulic oil.

[0039] When the pilot valve working port is connected to the liquid inlet pipeline, the high-pressure liquid in the pilot valve enters the control chamber 14 through the first interface 13, and the control chamber 14 is filled with high-pressure liquid. Since the flow cross-section of the working medium flowing in from the liquid inlet 11 is small, and the flow cross-section of the working medium in the main control chamber 14 is large, the pressure exerted by the working medium on the valve seat 3 toward the left is greater than the pressure exerted by the working medium on the main valve core 2 toward the right, that is, the main valve core 2 and the valve seat 3 are subjected to the leftward liquid pressure of the working medium as a whole. Under the action of this liquid pressure, The valve seat 3 and the main valve core 2 are pushed to the left, and the valve seat 3 and the main valve core 2 are abutted against each other, closing the return liquid port 12, so that the connection between the first flow channel 101 and the return liquid port 12 is disconnected, and the liquid in the valve body 1 cannot flow out from the return liquid port 12; at the same time, since the main valve core 2 moves to the left, the contact between the main valve core 2 and the inner wall of the valve body 1 is disconnected, so that the second flow channel 102 between the two is opened, and the liquid inlet 11 is connected with the main valve core core hole 21, and the high-pressure liquid enters the first flow channel 101 from the liquid inlet 11, and flows out from the second interface 22 to flow to the load.

[0040] When the working port of the pilot valve is connected to the return liquid pipeline, the working medium in the control chamber 14 flows to the first interface 13, causing the pressure in the control chamber 14 to drop, and the valve seat 3 and the main valve core 2 move to the right at the same time under the action of the high-pressure liquid pressure on the left side, and the main valve core 2 contacts the inner wall of the valve body 1 again to form a seal, cutting off the communication relationship between the liquid inlet 11 and the main valve core core hole 21, that is, cutting off the communication relationship between the liquid inlet 11 and the second interface 22; at this time, there is still a certain residual pressure in the first flow channel 101 of the main valve core 2 to continue to push the valve seat 3 to move to the rightmost end, so that the left end face of the valve seat 3 is separated from the right end face of the main valve core 2, connecting the second interface 22 with the return liquid port 12, and the working medium in the load flows to the return liquid port 12, and flows out from the return liquid port 12 for system return liquid.

[0041] When the control chamber 14 has enough hydraulic pressure to move the main valve core 2 to the left, so that the second flow channel 102 is opened, the left end face of the valve seat 3 and the right end face of the main valve core 2 are tightly fitted and sealed, and the valve seat 3 and the main valve core 2 can be regarded as a whole. At this time, the overall force on the valve seat 3 and the main valve core 2 is: the hydraulic pressure of the control chamber 14 to the left, the hydraulic pressure of the liquid inlet 11 to the right, and the hydraulic pressure of the second interface 22 to the right, that is, F 控 =F P +F A ,

[0042] Under ideal conditions, the liquid inlet 11 remains unchanged, that is, the liquid pressure of the liquid inlet 11 is a constant value; in this way, the load can be controlled by adjusting the pressure in the first flow channel 101 connected to the second interface 22 according to the liquid pressure in the control chamber 14 through reasonable parameter settings. The greater the liquid pressure in the control chamber 14, the greater the liquid pressure in the chamber connected to the second interface 22, that is, the greater the load, so that load-sensitive proportional control can be achieved. For example, when the load requires pressure to increase, the pilot valve flow increase action can be automatically started to increase the liquid pressure in the control chamber 14.

[0043] The load-sensitive water-based proportional reversing valve provided in the embodiment of the present disclosure is provided with a liquid inlet 11, a liquid return port 12, and a first interface 13 connected to the working port of the pilot valve on the valve body 1, and a main valve core 2 and a valve seat 3 are movably arranged in the valve body 1, and a main valve core core hole 21 and a second interface 22 connected to the controlled load are provided on the main valve core 2, and the main valve core core hole 21 is respectively connected to the liquid inlet 11 and the second interface 22, and the second interface 22 is also connected to the liquid return port 12; the valve seat 3 is in contact with the main valve core 2, and the end of the valve seat 3 away from the valve body 1 is connected to the valve body 1 is connected to form a control chamber 14, and the control chamber 14 is communicated with the first interface 13; when the pilot valve working port is selectively connected to the liquid inlet pipeline or the liquid return pipeline, the working medium in the control chamber 14 can act on the main valve core 2 and the valve seat 3, so that the liquid inlet 11 is communicated with the main valve core core hole 21 or the second interface 11 is communicated with the liquid return port 12, thereby controlling the work of the controlled load, realizing load-sensitive proportional control, realizing accurate control of the hydraulic support posture and precise pushing and sliding, and improving the service life of the hydraulic support cylinder and the scraper conveyor.

[0044] In some embodiments, the valve seat 3 has a first section 31 that acts on the working medium, and the main valve core 2 is provided with a second section 23 that acts on the working medium near the liquid inlet 11, and the cross-sectional area of ​​the first section 31 is greater than the cross-sectional area of ​​the second section 23 to ensure that the liquid pressure in the control chamber 14 can push the main valve core 2 and the valve seat 3 to move, thereby realizing precise control of the water-based proportional reversing valve.

[0045] In some embodiments, the liquid return port 12 is opened at a position close to the connection between the main valve core 2 and the valve seat 3 along the radial direction of the valve body 1, and the liquid inlet 11 and the first interface 13 are respectively located on both sides of the liquid return port 12 along the axial direction of the valve body 1. In this way, the liquid inlet 11 or the liquid return port 12 can be selectively connected to the second interface 22 by moving the valve seat 3 left and right.

[0046] In some embodiments, a first conical surface 24 is provided at one end of the main valve core 2 facing the valve seat 3, and a second conical surface 32 is provided on the valve seat 3 to cooperate with the first conical surface 24, so as to facilitate the interaction between the two, so that when the valve seat 3 and the main valve core 2 move to the left under the action of liquid pressure, the two are in close contact, thereby cutting off the connection between the return liquid port 12 and the second interface 22.

[0047] In some embodiments, the main valve core 2 is provided with a connecting portion 25 extending radially outward, and the connecting portion 25 is arranged between the liquid inlet 11 and the main valve core core hole 21 along the axial direction of the main valve core 2. The movement of the main valve core 2 can drive the connecting portion 25 to act on the valve body 1, so that the liquid inlet 11 is connected or disconnected from the main valve core core hole 21, and the second flow channel 102 is opened or closed by moving the main valve core 2, thereby connecting or disconnecting the liquid inlet 11 with the second interface 22.

[0048] In some embodiments, the second cross section 23 is formed at one end of the connecting portion 25 close to the liquid inlet 11, which has a reasonable structure. It is only necessary to set the connecting portion 25 on the radial outer side of the main valve core 2, perform structural design on the connecting portion 25, and facilitate the movement of the main valve core 2 in the valve body 1.

[0049] In some embodiments, the connecting portion 25 has a taper angle 251 , which can ensure that the main valve core 2 is in close contact with the valve body 1 and close the second flow channel 102 .

[0050] In some embodiments, a step portion 33 is provided at a position of the valve seat 3 close to the liquid return port 11 to facilitate connection or disconnection between the second interface 22 and the liquid return port 12 .

[0051] In some embodiments, an elastic member 4 is further included. The elastic member is sleeved on the outer circumference of the main valve core and is arranged close to the second interface 22 . The elastic member 4 can be used to achieve elastic reset of the main valve core 2 .

[0052] It can be understood that the elastic member 4 can exert a rightward elastic force on the main valve core 2. At this time, F 控 =F P +F A +f 弹 , the spring force is too small compared to the hydraulic pressure and can be ignored.

[0053] In some embodiments, the first interface 13 is arranged at an angle to facilitate liquid inflow and liquid return through the first interface 13 .

[0054] The above description is only a preferred embodiment of the present disclosure and an explanation of the technical principles used. Those skilled in the art should understand that the scope of disclosure involved in the present disclosure is not limited to the technical solutions formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above disclosed concept. For example, the above features are replaced with the technical features with similar functions disclosed in the present disclosure (but not limited to) by each other to form a technical solution.

[0055] In addition, although each operation is described in a specific order, this should not be understood as requiring these operations to be performed in the specific order shown or in a sequential order. Under certain circumstances, multitasking and parallel processing may be advantageous. Similarly, although some specific implementation details are included in the above discussion, these should not be interpreted as limiting the scope of the present disclosure. Some features described in the context of a separate embodiment can also be implemented in a single embodiment in combination. On the contrary, the various features described in the context of a single embodiment can also be implemented in multiple embodiments individually or in any suitable sub-combination mode.

[0056] Although the subject matter has been described in language specific to structural features and / or methodological logical actions, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. On the contrary, the specific features and actions described above are merely example forms of implementing the claims.

Claims

1. A load-sensitive water-based proportional reversing valve, characterized in that: include: A valve body, wherein the valve body is provided with a liquid inlet, a liquid return port, and a first interface connected to a working port of a pilot valve; A main valve core is movably disposed in the valve body, the main valve core is provided with a main valve core hole and a second interface connected to a controlled load, the main valve core hole is connected to the liquid inlet and the second interface respectively, and the second interface is also connected to the liquid return port; A valve seat, movably disposed in the valve body and in contact with the main valve core, wherein one end of the valve seat away from the valve body is connected to the valve body to form a control cavity, and the control cavity is communicated with the first interface; When the working port of the pilot valve is selectively connected to the liquid inlet pipeline or the liquid return pipeline, the working medium in the control chamber can act on the main valve core and the valve seat, so that the second interface is selectively connected to the liquid inlet or the liquid return port, thereby controlling the operation of the controlled load.

2. The load-sensitive water-based proportional reversing valve according to claim 1, characterized in that: The valve seat has a first cross section that interacts with the working medium, and the main valve core is provided with a second cross section that interacts with the working medium near the liquid inlet, and the cross-sectional area of ​​the first cross section is greater than the cross-sectional area of ​​the second cross section.

3. The load-sensitive water-based proportional reversing valve according to claim 2, characterized in that: The liquid return port is opened in a radial direction of the valve body at a position close to the connection between the main valve core and the valve seat, and the liquid inlet and the first interface are respectively located on both sides of the liquid return port in an axial direction of the valve body.

4. The load-sensitive water-based proportional reversing valve according to claim 3, characterized in that: A first conical surface is provided on one end of the main valve core facing the valve seat, and a second conical surface matching the first conical surface is provided on the valve seat.

5. The load-sensitive water-based proportional reversing valve according to claim 3, characterized in that: The main valve core is provided with a connecting portion extending radially outward, and the connecting portion is arranged between the liquid inlet and the main valve core core hole along the axial direction of the main valve core. The movement of the main valve core can drive the connecting portion to act on the valve body, so that the liquid inlet is connected or disconnected with the main valve core core hole.

6. The load-sensitive water-based proportional reversing valve according to claim 5, characterized in that: An end of the connecting portion close to the liquid inlet forms the second cross section.

7. The load-sensitive water-based proportional reversing valve according to claim 5, characterized in that: The connecting portion has a taper angle.

8. The load-sensitive water-based proportional reversing valve according to claim 3, characterized in that: A step portion is provided at a position of the valve seat close to the liquid return port.

9. The load-sensitive water-based proportional reversing valve according to claim 3, characterized in that: It also includes an elastic member, which is sleeved on the outer periphery of the main valve core and arranged close to the second interface.

10. The load-sensitive water-based proportional reversing valve according to claim 1, characterized in that: The first interface is arranged obliquely.

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