A balancing valve with a throttle valve and a shuttle valve for controlling the oil circuit

Abstract

The present invention belongs to the technical field of hydraulic transmission, and specifically relates to a balancing valve with a throttle valve and a shuttle valve in a control oil circuit, comprising a valve body, wherein the left end of the valve body is the A side, and the right end of the valve body is the B side. A control oil working chamber is provided inside the valve body, and a shuttle valve core is slidably provided inside the control oil working chamber. An A side mounting hole communicating with a first oil inlet is provided at the left end of the shuttle valve core, and a B side mounting hole communicating with a second oil inlet is provided at the right end of the shuttle valve core. A first oil inlet and a second oil inlet communicating with the A side mounting hole and the B side mounting hole are provided on the A side and the B side, an A side piston is slidably provided inside the A side mounting hole, and a B side piston is slidably provided inside the B side mounting hole, and central channels are provided inside the A side piston and the B side piston, thereby increasing the safety factor of installation, and all parts are standard and universal, with high interchangeability and low cost.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic transmission, in particular to a balancing valve with a throttle valve and a shuttle valve in a control oil circuit. Background Art

[0002] The balancing valve is a hydraulic valve with composite functions. There is nothing special about the valve itself, except for the difference in function and place of use. In some equipment applications, due to large pressure changes or large flow deviations in the system, in order to reduce the instability of the system caused by these differences, a hydraulic balancing valve is installed on the corresponding actuator to control the motion state of the actuator and maintain the load. This valve is called a hydraulic balancing valve in the field of hydraulic transmission.

[0003] In the hydraulic system of boom-type mechanical equipment, the boom cylinder often nods and the telescopic cylinder vibrates, affecting the normal use of the equipment. The existing technology is to improve the working condition of the equipment by drilling holes in the balance valve body to control the oil and add a throttle valve. This requires increasing the size of the valve body and interfering with the original installation holes. Usually, in order to achieve the purpose of drilling holes in the valve body, the number of original installation holes is reduced. When the balance valve is under pressure, the uneven force on the installation screws poses a safety hazard. And the principle of this method is not applicable to other working conditions. Summary of the invention

[0004] The purpose of the present invention is to provide a balancing valve with a throttle valve and a shuttle valve in the control oil circuit to solve the unstable working conditions of the hydraulic system such as the nodding of the arm cylinder and the oscillation of the telescopic cylinder proposed in the above-mentioned background technology, without the need to separately process the valve body, without drilling holes in the valve body to pass the control oil, and without changing the original installation hole, thereby avoiding the problem of safety hazards.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a balancing valve with a throttle valve and a shuttle valve in a control oil circuit, comprising a valve body, the left end of the valve body being the A side, the right end of the valve body being the B side, a control oil working chamber being provided inside the valve body, a shuttle valve core being slidably provided inside the control oil working chamber, an A side mounting hole being provided at the left end of the shuttle valve core being communicated with a first oil inlet, a B side mounting hole being provided at the right end of the shuttle valve core being communicated with a second oil inlet, a first oil inlet and a second oil inlet being communicated with the A side mounting hole and the B side mounting hole being provided on the A side and the B side, an A side piston being slidably provided inside the A side mounting hole, a B side piston being slidably provided inside the B side mounting hole, central channels being provided inside the A side piston and the B side piston, a first throttle valve and a second throttle valve being respectively provided in the central channels of the A side piston and the B side piston, and the outer ends of the A side mounting hole and the B side mounting hole are both threadedly connected A valve sleeve is connected, and the ends of the A-side piston and the B-side piston are slidably inserted in the corresponding valve sleeves. The valve sleeve on the A side is provided with a small hole connected to the first oil inlet on the outer wall near the first oil inlet, and the valve sleeve on the B side is also provided with a small hole connected to the second oil inlet on the outer wall near the second oil inlet, and the inner walls of the valve sleeves on both sides are supported by the ends of the A-side piston and the B-side piston respectively through pressure regulating springs, and a one-way valve is slidably arranged in the A-side mounting hole and the B-side mounting hole, and the end of the one-way valve away from the valve sleeve is supported by the one-way valve spring and the A-side mounting hole and the B-side mounting hole, and the valve body is provided with a first pressure maintaining port and a second pressure maintaining port connected to the A-side mounting hole and the B-side mounting hole respectively, and a pressure regulating screw is fixedly arranged at the end of the valve sleeve, and the exposed part of the pressure regulating screw is connected to a sealing nut through a thread, and mounting ports are provided at both ends of the A-side piston and the B-side piston, and pressure regulating springs are fixedly sleeved on the outside of the two mounting ports.

[0006] Preferably, a second sealing ring is fixedly provided at the connection between the two valve sleeves and the two ends of the valve body.

[0007] Preferably, an annular opening is formed on the outer wall of the one-way valve, and a third sealing ring is fixedly disposed inside the annular opening.

[0008] Preferably, the outer walls of the A-side piston and the B-side piston close to one end are provided with mounting grooves, and the fourth sealing ring is fixedly arranged inside the two mounting grooves.

[0009] Preferably, the first throttle valve is rotationally connected to the A-side piston, and the second throttle valve is rotationally connected to the B-side piston. The first throttle valve and the second throttle valve can be replaced according to actual needs.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] Through the cooperation of the valve sleeve, the first oil inlet, the second oil inlet, the valve core, the A-side piston, the first throttle valve, the B-side piston and the second throttle valve, compared with the existing balancing valve, the control oil circuit of the balancing valve is completed inside the valve core without passing through the valve body, and there is no need to drill additional holes on the valve body to install the throttle valve. The volume of the valve body is greatly reduced, the number of valve body mounting holes is not reduced, and the safety factor of installation is increased. All parts are standard and universal, with high interchangeability and low cost. The newly added structure with a shuttle valve makes the principle of the balancing valve not only applicable to oil cylinders, but also to hydraulic motor conditions, especially hydraulic motor conditions with brakes. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the present invention;

[0013] Figure 2 This is a schematic diagram of the present invention.

[0014] In the figure: 1 valve body, 2 first oil inlet, 3 second oil inlet, 4 shuttle valve core, 5A side piston, 6 first throttle valve, 7B side piston, 8 second throttle valve, 9 valve sleeve, 10 check valve, 11 check valve spring, 12 first pressure maintaining port, 13 second pressure maintaining port, 14 pressure regulating screw, 15 sealing nut, 16 pressure regulating spring. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. Example

[0017] See also Figure 1-2The present invention provides a technical solution: a balancing valve with a throttle valve and a shuttle valve in a control oil circuit, comprising a valve body 1, the left end of the valve body 1 being the A side, the right end of the valve body 1 being the B side, a control oil working chamber being provided inside the valve body 1, a shuttle valve core 4 being slidably provided inside the control oil working chamber, an A side mounting hole being provided at the left end of the shuttle valve core 4 being communicated with a first oil inlet 2, a B side mounting hole being provided at the right end of the shuttle valve core 4 being communicated with a second oil inlet 3, a first oil inlet 2 and a second oil inlet 3 being provided at the A side and the B side being communicated with the A side mounting hole and the B side mounting hole, an A side piston 5 being slidably provided inside the A side mounting hole, a B side piston 7 being slidably provided inside the B side mounting hole, central channels being provided inside the A side piston 5 and the B side piston 7, a first throttle valve 6 and a second throttle valve 8 being respectively provided in the central channels of the A side piston 5 and the B side piston 7, valve sleeves 9 being threadedly connected to the outer ends of the A side mounting hole and the B side mounting hole, the A side piston 5 and the B side piston 7 being connected to the B side piston 7, The end of the plug 7 is slidably inserted into the corresponding valve sleeve 9. The valve sleeve 9 on the A side is provided with a small hole connected to the first oil inlet 2 on the outer wall near the first oil inlet 2. The valve sleeve 9 on the B side is also provided with a small hole connected to the second oil inlet 3 on the outer wall near the second oil inlet 3. The inner walls of the valve sleeves 9 on both sides are supported by the ends of the piston 5 on the A side and the piston 7 on the B side through the pressure regulating spring 16. A one-way valve 10 is slidably arranged in the mounting hole on the A side and the mounting hole on the B side. The one-way valve 10 is away from the valve One end of the sleeve 9 is supported by a one-way valve spring 11 and the A-side mounting hole and the B-side mounting hole. The valve body 1 is provided with a first pressure-maintaining port 12 and a second pressure-maintaining port 13 which are respectively connected to the A-side mounting hole and the B-side mounting hole. A pressure-regulating screw 14 is fixedly provided at the end of the valve sleeve 9. The exposed part of the pressure-regulating screw 14 is connected to a sealing nut 15 through threads. Mounting ports are provided at both ends of the A-side piston 5 and the B-side piston 7. Pressure-regulating springs 16 are fixedly sleeved on the outside of the two mounting ports.

[0018] A first sealing ring is fixedly arranged between the two valve sleeves 9 and the two sealing nuts 15 , and a second sealing ring is fixedly arranged at the connection points between the two valve sleeves 9 and both ends of the valve body 1 .

[0019] An annular opening is formed on the outer wall of the one-way valve 10 , and a third sealing ring is fixedly disposed inside the annular opening.

[0020] The outer walls of the A-side piston 5 and the B-side piston 7 close to one end are provided with mounting grooves, and the fourth sealing rings are fixedly arranged inside the two mounting grooves.

[0021] The first throttle valve 6 is rotatably connected to the A-side piston 5, and the second throttle valve 8 is rotatably connected to the B-side piston 7. The first throttle valve 6 and the second throttle valve 8 can be replaced according to actual needs.

[0022] Working principle: When the oil enters from the first oil inlet 2, the oil first pushes the one-way valve 10 to compress the one-way valve spring 11, and the oil enters the first pressure-maintaining port 12 through the one-way valve 10; at the same time, a part of the control oil enters the inside of the valve sleeve 9 through the small hole on the valve sleeve 9, and reaches the cavity where the pressure-regulating spring 16 is located. The cavity where the pressure-regulating spring 16 is located is connected to the A-side piston 5, and the control oil enters the first throttle valve 6 threadedly connected to the left end of the A-side piston 5 through the cavity where the pressure-regulating spring 16 is located. After passing through the first throttle valve 6, it continues to flow into the central channel in the A-side piston 5, passes through the A-side piston 5, and then enters the cavity where the shuttle valve core 4 is located, pushing the shuttle valve core 4 to move to the B side. When the shuttle valve core 4 contacts the B-side piston 7, the central channel of the B-side piston 7 is closed by the shuttle valve core 4. When the oil is no longer supplied, the piston 7 on the B side returns to its original position under the action of the pressure regulating spring 16 on the B side and contacts the one-way valve 10 on the B side, and the second pressure maintaining port 13 is connected to the second oil inlet 3 to form an oil circuit. When the oil is no longer supplied, the piston 7 on the B side returns to its original position under the action of the pressure regulating spring 16 on the B side and contacts the one-way valve 10 on the B side to seal. The second pressure maintaining port 13 is disconnected from the second oil inlet 3. The one-way valve 10 on the A side returns to its original position under the action of the one-way valve spring 11 and contacts the one-way valve 5 on the A side, and the first oil inlet 2 is disconnected from the first pressure maintaining port 12.

[0023] Similarly, the operation when the second oil inlet 3 is fed with oil is the same as the working principle when the first oil inlet 2 is fed with oil.

[0024] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention; therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the attached claims rather than the above description. Therefore, it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention, and any figure marks in the claims should not be regarded as limiting the claims involved.

[0025] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A balancing valve with a throttle valve and a shuttle valve in a control oil circuit, comprising a valve body (1), characterized in that: The left end of the valve body (1) is the A side, and the right end of the valve body (1) is the B side. A control oil working chamber is provided inside the valve body (1), and a shuttle valve core (4) is slidably provided inside the control oil working chamber. The left end of the shuttle valve core (4) is provided with an A side mounting hole connected to the first oil inlet (2), and the right end of the shuttle valve core (4) is provided with a B side mounting hole connected to the second oil inlet (3). The A side and the B side are provided with a first oil inlet (2) and a second oil inlet (3) connected to the A side mounting hole and the B side mounting hole. An A side piston (5) is slidably provided inside the A side mounting hole, and a B side piston (7) is slidably provided inside the B side mounting hole. A central channel is provided inside the A side piston (5) and the B side piston (7). A first throttle valve (6) and a second throttle valve (8) are provided in the central channels of the A side piston (5) and the B side piston (7), respectively. The A side mounting hole The outer ends of the mounting holes on the A and B sides are both threadedly connected with valve sleeves (9), and the ends of the pistons (5) on the A side and the pistons (7) on the B side are slidably inserted in the corresponding valve sleeves (9). The valve sleeve (9) on the A side is provided with a small hole in communication with the first oil inlet (2) on the outer wall near the first oil inlet (2), and the valve sleeve (9) on the B side is also provided with a small hole in communication with the second oil inlet (3) on the outer wall near the second oil inlet (3), and the inner walls of the valve sleeves (9) on both sides are connected. The overpressure regulating spring (16) is supported by the end portions of the A-side piston (5) and the B-side piston (7), respectively; a one-way valve (10) is slidably disposed in the A-side mounting hole and the B-side mounting hole; one end of the one-way valve (10) which faces away from the valve sleeve (9) is supported by the A-side mounting hole and the B-side mounting hole via a one-way valve spring (11); and a first pressure-maintaining port (12) and a second pressure-maintaining port (13) which are respectively communicated with the A-side mounting hole and the B-side mounting hole are formed on the valve body (1); A second sealing ring is fixedly provided at the connection between the valve sleeve (9) and both ends of the valve body (1); The outer wall of the one-way valve (10) is provided with an annular opening, and a third sealing ring is fixedly arranged inside the annular opening.

2. A balancing valve with a throttle valve and a shuttle valve in the control oil circuit according to claim 1, characterized in that: The outer walls of the A-side piston (5) and the B-side piston (7) close to one end are each provided with a mounting groove, and a fourth sealing ring is fixedly arranged inside the two mounting grooves.

3. A balancing valve with a throttle valve and a shuttle valve in the control oil circuit according to claim 1, characterized in that: The first throttle valve (6) is rotatably connected to the A-side piston (5), and the second throttle valve (8) is rotatably connected to the B-side piston (7).

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