Hydraulic half-bridge high water-based proportional valve

Abstract

This invention relates to the field of valve structure technology, and more particularly to a hydraulic half-bridge high-water-based proportional valve, comprising: a valve body, a main valve core, a main valve sleeve, and a return valve core. When liquid is supplied through the first inlet, the main valve core moves to a first position, reducing the flow rate from the half-bridge input variable throttle port to the cavity and increasing the flow rate from the half-bridge output variable throttle port to the drain port; until the second inlet disconnects from the second row of orifices, and the first row of orifices connects to the drain port. When the first inlet stops supplying liquid, the main valve core moves to a second position, increasing the flow rate from the half-bridge input variable throttle port to the cavity and decreasing the flow rate from the half-bridge output variable throttle port to the drain port; until the second inlet connects to the second row of orifices, and the first row of orifices disconnects from the drain port. This invention uses a hydraulic half-bridge structure to control the return valve core, simplifying the structure; by controlling the liquid supply through the first inlet, the output flow rate of the main valve is controlled, offering advantages such as simple and timely adjustment, simple structure, and light weight.

Description

Technical Field

[0001] This invention relates to the field of valve structure technology, and in particular to a hydraulic semi-bridge type high water-based proportional valve. Background Technology

[0002] With the continuous development of hydraulic or water-driven mechanical equipment such as engineering machinery, mining machinery, and agricultural machinery, the performance requirements of mechanical products are becoming increasingly demanding. Given the huge domestic and international market demand, it is of great significance to provide a variable-opening proportional valve that is simple in structure, easy to control, has high control precision, is applicable to a wide range of media viscosity, and is suitable for ultra-high pressure and high flow applications. A high-water-based proportional valve is a hydraulic valve used for regulating the flow rate of pure water or emulsion media, mainly used in explosion-proof environments such as coal mines. Currently, the high-water-based hydraulic cylinders in fully mechanized mining face hydraulic systems are mainly controlled by valve opening and closing time, which often causes problems such as over-extension or over-retraction of the hydraulic cylinders, making it impossible to guarantee the posture control of the hydraulic support. To overcome the bottleneck of difficult precise control of the hydraulic support posture, a high-water-based proportional valve with stepless flow regulation function is urgently needed.

[0003] Existing high-water-based proportional valves are divided into three categories. The first category uses high-speed switching valves for pilot control, such as CN116607989A (a water-based proportional valve) and CN111894924A (a high-water-based, high-pressure, high-flow digital proportional directional valve with manual / automatic control). The second category uses motor-driven pilot control, such as CN109555740B (a water-based proportional valve and its control method) and CN117329189A (a follow-up pilot water-based proportional valve). The third category uses a hydraulically balanced scheme controlled by a pilot pressure reducing valve, such as CN113685387B (a pressure-balanced water-based proportional directional valve) and CN115653961A (a high-water-based proportional directional valve and its operating method). All three types of high-water-based proportional valves are two-position, three-way proportional valves, and their return valve cores require additional control oil circuits, resulting in a complex proportional valve oil circuit structure. Summary of the Invention

[0004] This invention provides a hydraulic semi-bridge type high water-based proportional valve to solve the problem that the existing high water-based proportional valve uses a two-position three-way proportional valve, which requires an additional control oil circuit for control, resulting in a complex proportional valve oil circuit structure.

[0005] This invention provides a hydraulic semi-bridge type high water-based proportional valve, comprising:

[0006] The valve body has a first liquid inlet, a second liquid inlet, and a liquid outlet.

[0007] The main valve core is movably disposed inside the valve body. The surface of the main valve core has a first row of holes and a second row of holes. A half-bridge input variable throttle port and a half-bridge output variable throttle port are formed between the main valve core and the valve body. The position of the main valve core inside the valve body is adjusted by the liquid supply through the first liquid inlet.

[0008] The main valve sleeve is fixed inside the valve body and sleeved on the outside of the main valve core;

[0009] A return valve core is movably disposed between the valve body and the main valve core, and connected to the main valve sleeve via a first elastic element. A cavity is formed on the side of the return valve core away from the first elastic element. A half-bridge input variable throttle port is connected between the cavity and the second inlet port, and a half-bridge output variable throttle port is connected between the cavity and the outlet port. The position of the return valve core between the valve body and the main valve core is adjusted by the liquid supply of the half-bridge input variable throttle port, the liquid discharge of the half-bridge output variable throttle port, and the force of the first elastic element.

[0010] According to the hydraulic half-bridge high water-based proportional valve provided by the present invention, when the first inlet supplies liquid, it drives the main valve core to move to the first position. The flow rate from the half-bridge input variable throttle port to the cavity decreases, and the flow rate from the half-bridge output variable throttle port to the drain port increases. Until the main valve core moves to the first position, the second inlet port is disconnected from the second drain hole, and the first drain hole is connected to the drain port through the first elastic element so as to drain liquid through the drain port.

[0011] When the first inlet stops supplying liquid, the main valve core moves to the second position, the flow rate from the half-bridge input variable throttle port to the cavity increases, and the flow rate from the half-bridge output variable throttle port to the drain port decreases; until the main valve core moves to the second position, the second inlet connects with the second drain hole to drain liquid to the rear end of the main valve core, and the return valve core moves between the first drain hole and the drain port to disconnect the first drain hole from the drain port.

[0012] According to the hydraulic half-bridge high-water-based proportional valve provided by the present invention, the half-bridge input variable throttle orifice includes a first groove, and the half-bridge output variable throttle orifice includes a second groove; wherein...

[0013] A first gap is formed between the first tank and the second inlet for liquid to pass through. When the main valve core moves to the first position, the first gap decreases, and when the main valve core moves to the second position, the first gap increases.

[0014] A second gap is formed between the second tank and the cavity to allow liquid to pass through. When the main valve core moves to the first position, the second gap increases, and when the main valve core moves to the second position, the second gap decreases.

[0015] According to the hydraulic semi-bridge high water-based proportional valve provided by the present invention, a guide hole is also formed on the main valve core, and the guide hole connects the interior of the main valve core with the second row of holes.

[0016] According to the hydraulic semi-bridge high water-based proportional valve provided by the present invention, a liquid passage hole is also formed on the main valve sleeve. One end of the liquid passage hole is connected to the second liquid inlet. When the main valve core moves to the second position, the other end of the liquid passage hole is connected to the second row of holes.

[0017] The hydraulic semi-bridge high water-based proportional valve provided by the present invention further includes:

[0018] A front end cover, which is fixed to one end of the valve body;

[0019] The rear end cover is fixed to the other end of the valve body and has a working port formed on it. The working port communicates with the interior of the main valve core. The front end cover, the valve body, and the rear end cover form a cavity for accommodating the main valve core. The main valve core is connected to the rear end cover through a second elastic element. The position of the main valve core inside the cavity is adjusted by the liquid supply from the first liquid inlet and the force of the second elastic element.

[0020] The hydraulic semi-bridge high water-based proportional valve provided by the present invention further includes: a balance valve core, the balance valve core being disposed at one end of the main valve core near the front end cover, and the balance valve core having a third groove formed on the side near the first liquid inlet, wherein the liquid supplied from the first liquid inlet pushes the balance valve core through the third groove to drive the main valve core to move to a first position.

[0021] The hydraulic semi-bridge high water-based proportional valve provided by the present invention further includes: a displacement sensor, wherein the sensing end of the displacement sensor is connected to one end of the balance valve core, and is used to detect the displacement of the balance valve core and the main valve core.

[0022] The hydraulic semi-bridge high water-based proportional valve provided by the present invention further includes: a connecting rod, one end of which is fixedly connected to the main valve core, and the other end of which passes through the balance valve core and is fixedly connected to the balance valve core.

[0023] The hydraulic semi-bridge high water-based proportional valve provided by the present invention further includes: a connecting plate, the connecting plate being fixed to one end of the balance valve core near the front end cover, and the connecting plate being fixedly connected to the other end of the connecting rod.

[0024] This invention provides a hydraulic semi-bridge high-water-based proportional valve, comprising a valve body, a main valve core, a main valve sleeve, and a return valve core. The valve body has a first inlet, a second inlet, and a drain port. The main valve core is movably disposed inside the valve body, and its surface has a first row of holes and a second row of holes. A semi-bridge input variable throttle port and a semi-bridge output variable throttle port are formed between the main valve core and the valve body. The position of the main valve core inside the valve body is adjusted by the fluid supply through the first inlet. The main valve sleeve is fixed inside the valve body and sleeved on the main valve core. The outer side of the core; the return valve core is movably disposed between the valve body and the main valve core, and is connected to the main valve sleeve through the first elastic element. A cavity is formed on the side of the return valve core away from the first elastic element. The half-bridge input variable throttle port is connected between the cavity and the second inlet port, and the half-bridge output variable throttle port is connected between the cavity and the outlet port. The position of the return valve core between the valve body and the main valve core is adjusted by the liquid supply of the half-bridge input variable throttle port, the liquid discharge of the half-bridge output variable throttle port, and the force of the first elastic element.

[0025] When the first inlet supplies liquid, it drives the main valve core to move to the first position. The flow rate from the half-bridge input variable throttle port to the cavity decreases, and the flow rate from the half-bridge output variable throttle port to the drain port increases. Until the main valve core moves to the first position, the second inlet port and the second row of holes are disconnected, and the first row of holes are connected to the drain port through the first elastic element so that liquid can be discharged through the drain port.

[0026] When the first inlet stops supplying liquid, the main valve core moves to the second position, the flow rate from the half-bridge input variable throttle port to the cavity increases, and the flow rate from the half-bridge output variable throttle port to the drain port decreases; until the main valve core moves to the second position, the second inlet connects with the second row of holes to drain liquid to the rear end of the main valve core, and the return valve core moves between the first row of holes and the drain port to disconnect the first row of holes from the drain port.

[0027] The present invention provides a hydraulic semi-bridge type high water-based proportional valve, which has the following beneficial effects:

[0028] On the one hand, a hydraulic half-bridge oil circuit structure is used to control the return valve core, replacing the traditional solution that requires an additional pilot valve to control the return valve core, thus simplifying the structure and having the advantage of simple mechanical and electrical connections;

[0029] On the other hand, by controlling the liquid supply flow / pressure at the first inlet, the displacement of the main valve core, i.e. the valve opening, is controlled, thereby controlling the output flow of the main valve. It has the advantages of simple and timely regulation, simple valve core structure, and light weight. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0031] Figure 1 This is a cross-sectional schematic diagram of a hydraulic semi-bridge high water-based proportional valve provided in one embodiment of the present invention.

[0032] Figure 2 yes Figure 1 Cross-sectional view of AA.

[0033] Figure 3 yes Figure 1 A partial schematic diagram of B in the diagram.

[0034] Figure 4 yes Figure 2 A partial schematic diagram of C.

[0035] Figure label:

[0036] 1: Front end cap; 2: Valve body; 3: Oil inlet plug; 4: Return valve core; 5: First elastic element; 6: Main valve sleeve; 7: Second elastic element; 8: Rear end cap; 9: Main valve core; 10: Balance valve core; 11: Connecting rod; 12: Connecting disc; 13: Displacement sensor; 14: Return plug; 2.1: First inlet; 2.2: Drain; 2.3: Second inlet; 2.4: Half-bridge input variable throttling port; 2.5: Cavity; 2.6: Half-bridge output variable throttling port; 8.1: Working port; 9.1: Guide hole; 9.2: First row of holes; 9.3: Second row of holes. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0038] In the description of this embodiment, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this embodiment and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this embodiment.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this embodiment, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0040] In this embodiment, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," "link," and "fix" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0041] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0042] The following is combined Figures 1-4 This invention describes a hydraulic semi-bridge high-water-based proportional valve. The hydraulic semi-bridge high-water-based proportional valve includes: a valve body 2, a main valve core 9, a main valve sleeve 6, and a return valve core 4, etc. In this invention, the direction of the front end cover 1 is defined as the front end of the proportional valve, and the direction of the rear end cover 8 is defined as the rear end of the proportional valve. Figure 1 and Figure 2 In the structure shown, the left end is the front end and the right end is the rear end.

[0043] The valve body 2 has a first inlet 2.1, a second inlet 2.3, and a drain 2.2. The main valve core 9 is movably disposed inside the valve body 2. The surface of the main valve core 9 has a first row of holes 9.2 and a second row of holes 9.3. A half-bridge input variable throttle port 2.4 and a half-bridge output variable throttle port 2.6 are formed between the main valve core 9 and the valve body 2. The position of the main valve core 9 inside the valve body 2 is adjusted by the liquid supply through the first inlet 2.1. The main valve sleeve 6 is fixed inside the valve body 2 and sleeved on the outside of the main valve core 9. The return valve core 4 is movably disposed inside the valve body 2. Between valve body 2 and main valve core 9, and connected to main valve sleeve 6 via first elastic element 5, a cavity 2.5 is formed on the side of return valve core 4 away from the first elastic element 5. Half-bridge input variable throttle port 2.4 is connected between cavity 2.5 and second inlet port 2.3, and half-bridge output variable throttle port 2.6 is connected between cavity 2.5 and drain port 2.2. The position of return valve core 4 between valve body 2 and main valve core 9 is adjusted by the liquid supply of half-bridge input variable throttle port 2.4, the liquid discharge of half-bridge output variable throttle port 2.6, and the force of the first elastic element 5.

[0044] Specifically, liquid enters and exits the valve body 2 through the first inlet 2.1, the second inlet 2.3, and the outlet 2.2. The main valve core 9 has a hollow internal structure with flow channels that connect the first row of holes 9.2 and the second row of holes 9.3, and drain liquid to the rear end, i.e., the working port 8.1 of the rear cover 8, through the flow channels. The main valve core 9 can move axially inside the valve body 2, powered by the liquid supply pressure of the first inlet 2.1 and the elastic reset of the second elastic element 7 (described in detail in subsequent embodiments). The axial movement of the main valve core 9 controls the flow rate of the half-bridge input variable throttle port 2.4 and the half-bridge output variable throttle port 2.6. By changing the flow rate of the half-bridge input variable throttle port 2.4 and the half-bridge output variable throttle port 2.6, the liquid pressure in the cavity 2.5 on one side of the return valve core 4 is controlled. The movement state of the return valve core 4 is controlled by the relationship between the liquid pressure and the elastic force of the first elastic element 5.

[0045] Furthermore, the first liquid inlet 2.1 is a control port that can control the movement of the main valve core 9; the second liquid inlet 2.3 supplies liquid to the main valve core 9, and a liquid inlet channel is formed inside the valve body 2. An oil inlet plug 3 is installed on the valve body 2 to block the liquid inlet channel; the liquid outlet 2.2 is a return port for returning liquid, and a return liquid channel is formed inside the valve body 2. An oil return plug 14 is installed on the valve body 2 to block the return liquid channel.

[0046] In practical operation, this invention:

[0047] When the first inlet 2.1 supplies liquid, it moves the main valve core 9 to the first position. The flow rate from the half-bridge input variable throttle port 2.4 to the cavity 2.5 decreases, and the flow rate from the half-bridge output variable throttle port 2.6 to the drain port 2.2 increases. Until the main valve core 9 moves to the first position, the second inlet 2.3 is disconnected from the second outlet 9.3, and the first outlet 9.2 is connected to the drain port 2.2 through the first elastic element 5, so that liquid can be discharged through the drain port 2.2.

[0048] When the first inlet 2.1 stops supplying liquid, the main valve core 9 moves to the second position, the flow rate from the half-bridge input variable throttle port 2.4 to the cavity 2.5 increases, and the flow rate from the half-bridge output variable throttle port 2.6 to the drain port 2.2 decreases; until the main valve core 9 moves to the second position, the second inlet 2.3 connects with the second row hole 9.3 to drain liquid to the rear end of the main valve core 9, and the return valve core 4 moves between the first row hole 9.2 and the drain port 2.2 to disconnect the first row hole 9.2 from the drain port 2.2.

[0049] It is understandable that, in cases like Figure 1 and Figure 2 In the structure shown, the first position represents the right end of valve body 2, and the second position represents the left end of valve body 2.

[0050] exist Figure 3 Schematic diagram and Figure 4 In the schematic diagram, the movement of valve body 2 can be achieved by controlling the liquid supply to the first liquid inlet 2.1. As valve body 2 moves, the flow rates of the half-bridge input variable throttle port 2.4 and the half-bridge output variable throttle port 2.6 are also controlled. When valve body 2 is in the first position, the second inlet 2.3 is misaligned and disconnected from the second row of holes 9.3. The half-bridge input variable throttle port 2.4 is in the minimum position, with the minimum input flow rate. The half-bridge output variable throttle port 2.6 is in the maximum position, with the maximum output flow rate. The cavity 2.5 has the minimum pressure. Due to the force of the first elastic element 5, the return valve core 4 is at the leftmost end, and the first row of holes 9.2 is connected to the drain port 2.2. When valve body 2 is in the second position, the second inlet 2.3 is opposite to and connected to the second row of holes 9.3. The half-bridge input variable throttle port 2.4 is in the maximum position, with the maximum input flow rate. The half-bridge output variable throttle port 2.6 is in the minimum position, with the minimum output flow rate. The cavity 2.5 has the maximum pressure and overcomes the force of the first elastic element 5, causing the return valve core 4 to be at the rightmost end, blocking the first row of holes 9.2 and the drain port 2.2, thus disconnecting the first row of holes 9.2 from the drain port 2.2.

[0051] In the initial state, liquid is supplied to the first inlet 2.1 and the second inlet 2.3 respectively. At this time, the main valve is closed, that is, the second inlet 2.3 is disconnected from the second row of holes 9.3, and the first row of holes 9.2 is connected to the outlet 2.2. Gradually reduce the liquid supply flow rate / pressure of the first inlet 2.1, the main valve core 9 moves to the second position (i.e., the left end), the main valve opens, and the output flow rate is different depending on the opening degree of the main valve. Ultimately, by controlling the liquid supply flow rate / pressure of the first inlet 2.1, the displacement of the main valve core 9, that is, the valve opening degree, is controlled, thereby controlling the output flow rate of the main valve.

[0052] This invention provides a hydraulic half-bridge high-water-based proportional valve. On one hand, it uses a hydraulic half-bridge oil circuit structure to control the return valve core 4, replacing the traditional solution that requires an additional pilot valve to control the return valve core 4, thus simplifying the structure and offering the advantages of simple mechanical and electrical connections. On the other hand, by controlling the supply flow / pressure of the first inlet 2.1, it achieves control of the displacement of the main valve core 9, i.e., the valve opening, thereby controlling the output flow of the main valve. It has the advantages of simple and timely regulation, simple valve core structure, and light weight.

[0053] In one embodiment of the present invention, the half-bridge input variable throttle port 2.4 includes a first groove, and the half-bridge output variable throttle port 2.6 includes a second groove. A first gap for liquid to pass through is formed between the first groove and the second inlet port 2.3. When the main valve core 9 moves to the first position, the first gap decreases, and when the main valve core 9 moves to the second position, the first gap increases. A second gap for liquid to pass through is formed between the second groove and the cavity 2.5. When the main valve core 9 moves to the first position, the second gap increases, and when the main valve core 9 moves to the second position, the second gap decreases. In this embodiment, both the half-bridge input variable throttle port 2.4 and the half-bridge output variable throttle port 2.6 adopt a groove structure. During the movement of the main valve core 9, adjustable gaps are formed between it and the liquid supply channel of the second inlet port 2.3 and between it and the cavity 2.5. These gaps control the inlet flow rate / pressure and the outlet flow rate / pressure. The pressure generated in the cavity 2.5 by the inlet and outlet flow rates / pressures is compared with the elastic force provided by the first elastic element 5. When the pressure inside cavity 2.5 is greater than the elastic force of the first elastic element 5, the first elastic element 5 is compressed and the return valve core 4 moves to the right. When the pressure inside cavity 2.5 is less than the elastic force of the first elastic element 5, the first elastic element 5 extends and the return valve core 4 moves to the left.

[0054] In one embodiment of the present invention, a guide hole 9.1 is also formed on the main valve core 9, which connects the interior of the main valve core 9 with the second row of holes 9.3. In this embodiment, the pressure inside the main valve core 9 is introduced to the main valve port through the guide hole 9.1 provided on the main valve core 9, thereby reducing the noise and wear caused by cavitation at the valve port.

[0055] In one embodiment of the present invention, a liquid passage is also formed on the main valve sleeve 6. One end of the liquid passage is connected to the second liquid inlet 2.3. When the main valve core 9 moves to the second position, the other end of the liquid passage is connected to the second row of holes 9.3. In this embodiment, when the main valve core 9 moves to the second position, the second liquid inlet 2.3 is connected to the second row of holes 9.3 through the liquid passage. When the main valve core 9 moves to the first position, the liquid passage is disconnected from the second row of holes 9.3.

[0056] In one embodiment of the present invention, the hydraulic semi-bridge high-water-based proportional valve further includes a front cover 1 and a rear cover 8. The front cover 1 is fixed to one end of the valve body 2; the rear cover 8 is fixed to the other end of the valve body 2. A working port 8.1 is formed on the rear cover 8, which communicates with the interior of the main valve core 9. The front cover 1, valve body 2, and rear cover 8 form a cavity for accommodating the main valve core 9. The main valve core 9 is connected to the rear cover 8 via a second elastic element 7. The position of the main valve core 9 within the cavity is adjusted by the liquid supply through the first inlet 2.1 and the force exerted by the second elastic element 7. In this embodiment, the front cover 1 and rear cover 8 are respectively installed at the front and rear ends of the valve body 2, forming a cavity for accommodating the main valve core 9. The second elastic element 7 is provided between the rear cover 8 and the main valve core 9. When the first inlet 2.1 is not supplied with liquid or the liquid supply is reduced, the main valve core 9 can move to a second position, i.e., to the left, under the dominant action of the second elastic element 7. In addition, the liquid inside the main valve core 9 can be discharged from its interior through the working port 8.1.

[0057] In one embodiment of the present invention, the hydraulic semi-bridge high-water-based proportional valve further includes a balance valve core 10, which is located at the end of the main valve core 9 near the front end cover 1. The balance valve core 10 has a third groove formed on the side near the first inlet port 2.1. Liquid supplied from the first inlet port 2.1 pushes the balance valve core 10 through the third groove, thereby moving the main valve core 9 to a first position. In this embodiment, the balance valve core 10 is located at the front end of the main valve core 9 and is fixedly connected to it. Liquid is supplied from the first inlet port 2.1, and the balance valve core 10 moves to the right, overcoming the force of the second elastic element 7. The main valve core 9 moves to the right synchronously. This embodiment employs a hydraulically balanced structure composed of the main valve core 9 and the balance valve core 10, along with a hollow valve core structure. This overcomes the contradictory relationship between valve core balance and response present in traditional water-based hydraulic valve designs, and has the advantages of lightweight valve core and fast displacement response.

[0058] In one embodiment of the present invention, the hydraulic half-bridge high-water-based proportional valve further includes a displacement sensor 13, the sensing end of which is connected to one end of the balance valve core 10, for detecting the displacement of the balance valve core 10 and the main valve core 9. In this embodiment, by monitoring the displacement of the balance valve core 10 and the main valve core 9 through the displacement sensor 13, the operating status of the proportional valve can be monitored through the displacement.

[0059] In one embodiment of the present invention, the hydraulic semi-bridge high-water-based proportional valve further includes a connecting rod 11, one end of which is fixedly connected to the main valve core 9, and the other end of which passes through the balance valve core 10 and is fixedly connected to it. In this embodiment, the balance valve core 10 is connected and fixed to the main valve core 9 via the connecting rod 11, so that the balance valve core 10 and the main valve core 9 move synchronously. Preferably, to ensure the connection stability between the balance valve core 10 and the main valve core 9, multiple connecting rods 11 can be provided.

[0060] In one embodiment of the present invention, the hydraulic semi-bridge high-water-based proportional valve further includes a connecting plate 12, which is fixed to one end of the balance valve core 10 near the front end cover 1, and the connecting plate 12 is fixedly connected to the other end of the connecting rod 11. In this embodiment, the connecting plate 12 is fixedly connected to each connecting rod 11 to ensure that the end face of the balance valve core 10 is parallel to the end face of the main valve core 9, thus ensuring the axial movement stability of the main valve core 9.

[0061] In one embodiment of the present invention, both the first elastic element 5 and the second elastic element 7 are pressure springs. Under the action of the first elastic element 5, the return valve core 4 tends to move towards the cavity 2.5; under the action of the second elastic element 7, the main valve core 9 tends to move towards the front end. That is, in Figure 1 and Figure 2 In the structure shown, the first elastic element 5 provides a leftward thrust to the return valve core 4, and the second elastic element 7 provides a leftward thrust to the main valve core 9.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hydraulic semi-bridge type high water-based proportional valve, characterized in that, include: Valve body (2), wherein the valve body (2) is formed with a first liquid inlet (2.1), a second liquid inlet (2.3) and a liquid outlet (2.2); The main valve core (9) is movably disposed inside the valve body (2). The surface of the main valve core (9) is formed with a first row of holes (9.2) and a second row of holes (9.3). A half-bridge input variable throttle port (2.4) and a half-bridge output variable throttle port (2.6) are formed between the main valve core (9) and the valve body (2). The position of the main valve core (9) inside the valve body (2) is adjusted by the liquid supply through the first liquid inlet (2.1). The main valve sleeve (6) is fixed inside the valve body (2) and sleeved on the outside of the main valve core (9); The return valve core (4) is movably disposed between the valve body (2) and the main valve core (9) and is connected to the main valve sleeve (6) through the first elastic element (5). A cavity (2.5) is formed on the side of the return valve core (4) away from the first elastic element (5). The half-bridge input variable throttle port (2.4) is connected between the cavity (2.5) and the second liquid inlet (2.3). The half-bridge output variable throttle port (2.6) is connected between the cavity (2.5) and the drain port (2.2). The position of the return valve core (4) between the valve body (2) and the main valve core (9) is adjusted by the liquid supply of the half-bridge input variable throttle port (2.4), the liquid discharge of the half-bridge output variable throttle port (2.6) and the force of the first elastic element (5).

2. The hydraulic semi-bridge type high water-based proportional valve according to claim 1, characterized in that, When the first inlet (2.1) supplies liquid, it drives the main valve core (9) to move to the first position. The flow rate from the half-bridge input variable throttle port (2.4) to the cavity (2.5) decreases, and the flow rate from the half-bridge output variable throttle port (2.6) to the drain port (2.2) increases. Until the main valve core (9) moves to the first position, the second inlet (2.3) is disconnected from the second drain hole (9.3), and the first drain hole (9.2) is connected to the drain port (2.2) through the first elastic element (5) so as to drain liquid through the drain port (2.2). When the first inlet (2.1) stops supplying liquid, the main valve core (9) moves to the second position, the flow rate from the half-bridge input variable throttle port (2.4) to the cavity (2.5) increases, and the flow rate from the half-bridge output variable throttle port (2.6) to the drain port (2.2) decreases; until the main valve core (9) moves to the second position, the second inlet (2.3) communicates with the second row hole (9.3) to drain liquid to the rear end of the main valve core (9), and the return valve core (4) moves between the first row hole (9.2) and the drain port (2.2) to disconnect the first row hole (9.2) from the drain port (2.2).

3. The hydraulic semi-bridge type high water-based proportional valve according to claim 2, characterized in that, The half-bridge input variable throttle orifice (2.4) includes a first slot, and the half-bridge output variable throttle orifice (2.6) includes a second slot; wherein, A first gap is formed between the first tank and the second liquid inlet (2.3) for liquid to pass through. When the main valve core (9) moves to the first position, the first gap decreases, and when the main valve core (9) moves to the second position, the first gap increases. A second gap is formed between the second tank and the cavity (2.5) for liquid to pass through. When the main valve core (9) moves to the first position, the second gap increases, and when the main valve core (9) moves to the second position, the second gap decreases.

4. The hydraulic semi-bridge type high water-based proportional valve according to claim 1, characterized in that, The main valve core (9) also has a flow guide hole (9.1) formed thereon, which connects the interior of the main valve core (9) with the second row of holes (9.3).

5. The hydraulic semi-bridge type high water-based proportional valve according to claim 2 or 3, characterized in that, The main valve sleeve (6) also has a liquid passage hole. One end of the liquid passage hole is connected to the second liquid inlet (2.3). When the main valve core (9) moves to the second position, the other end of the liquid passage hole is connected to the second row hole (9.3).

6. The hydraulic semi-bridge type high water-based proportional valve according to claim 2 or 3, characterized in that, Also includes: A front cover (1) is fixed to one end of the valve body (2); The rear end cover (8) is fixed to the other end of the valve body (2). A working port (8.1) is formed on the rear end cover (8). The working port (8.1) is connected to the interior of the main valve core (9). The front end cover (1), the valve body (2) and the rear end cover (8) form a cavity for accommodating the main valve core (9). The main valve core (9) is connected to the rear end cover (8) through the second elastic element (7). The position of the main valve core (9) inside the cavity is adjusted by the liquid supply of the first liquid inlet (2.1) and the force of the second elastic element (7).

7. The hydraulic semi-bridge type high water-based proportional valve according to claim 6, characterized in that, Also includes: The balance valve core (10) is located at one end of the main valve core (9) near the front end cover (1), and the balance valve core (10) has a third groove on the side near the first liquid inlet (2.1). The liquid supplied from the first liquid inlet (2.1) pushes the balance valve core (10) through the third groove, thereby driving the main valve core (9) to move to the first position.

8. The hydraulic semi-bridge type high water-based proportional valve according to claim 7, characterized in that, Also includes: Displacement sensor (13), the sensing end of the displacement sensor (13) is connected to one end of the balance valve core (10), and is used to detect the displacement of the balance valve core (10) and the main valve core (9).

9. The hydraulic semi-bridge type high water-based proportional valve according to claim 7, characterized in that, Also includes: A connecting rod (11) is fixedly connected at one end to the main valve core (9), and the other end of the connecting rod (11) passes through the balance valve core (10) and is fixedly connected to the balance valve core (10).

10. The hydraulic semi-bridge type high water-based proportional valve according to claim 9, characterized in that, Also includes: A connecting disc (12) is fixed to one end of the balance valve core (10) near the front end cover (1), and the connecting disc (12) is fixedly connected to the other end of the connecting rod (11).

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