Hydraulic half-bridge type high-water-base proportional valve

Abstract

The invention relates to the technical field of valve structures, in particular to a hydraulic half-bridge type high-water-base proportional valve which comprises a valve body, a main valve element, a main valve sleeve and a liquid return valve element. When the first liquid inlet supplies liquid, the main valve element is driven to move towards the first position, the flow, flowing to the cavity, of the half-bridge input variable throttling opening is reduced, and the flow, flowing to the liquid discharging opening, of the half-bridge output variable throttling opening is increased; until the second liquid inlet is disconnected from the second discharge hole, the first discharge hole is communicated with the liquid outlet; when the first liquid inlet stops supplying liquid, the main valve element moves to the second position, the flow flowing to the cavity from the half-bridge input variable throttling opening is increased, and the flow flowing to the liquid discharging opening from the half-bridge output variable throttling opening is decreased; until the second liquid inlet is communicated with the second discharge hole, the first discharge hole is disconnected from the liquid outlet. A hydraulic half-bridge structure is adopted to control the liquid return valve element, and the structure is simplified; the liquid supply of the first liquid inlet is controlled, the output flow of the main valve is controlled, and the valve has the advantages of being simple and timely in regulation and control, simple in structure and light in weight.

Description

Technical Field

[0001] The invention relates to the technical field of valve structures, and in particular to a hydraulic half-bridge high water-based proportional valve. Background Art

[0002] With the continuous development of hydraulic or water pressure driven mechanical equipment such as engineering machinery, mining machinery, agricultural machinery, etc., the performance requirements of mechanical products are getting higher. Under the huge market demand at home and abroad, it is of great significance to provide a variable opening proportional valve with simple structure, convenient control, high control accuracy, wide range of applicable medium viscosity, and suitable for ultra-high pressure and large flow occasions. The high water-based proportional valve is a hydraulic valve used for pure water or emulsion medium flow regulation, mainly used in coal mines and other occasions that require explosion protection. At present, the high water-based hydraulic cylinder of the hydraulic system of the comprehensive mining working face is mainly controlled by the time of the switch valve, which often causes the problem of over-extension or over-retraction of the hydraulic cylinder, and the posture control of the hydraulic support cannot be guaranteed. In order to break through the bottleneck of the difficulty in accurately controlling the posture of the hydraulic support, a high water-based proportional valve with stepless flow adjustment function is urgently needed.

[0003] Existing high water-based proportional valves are divided into three categories. The first category is controlled by high-speed switch valve pilot, such as CN116607989A (a water-based proportional valve) and CN111894924A (a high water-based high-pressure and large-flow digital proportional directional valve with manual and automatic control); the second category is controlled by motor pilot, 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 is a hydraulic balance scheme controlled by a pilot pressure reducing valve, such as CN113685387B (a pressure-balanced water-based proportional reversing valve) and CN115653961A (a high water-based proportional directional valve and working method). The above three types of high water-based proportional valves are all two-position three-way proportional valves, and their return valve cores all require additional control oil circuits for control, resulting in a complex oil circuit structure of the proportional valve. Summary of the invention

[0004] The present invention provides a hydraulic half-bridge high water base proportional valve, which is used to solve the defect that the high water base proportional valve in the prior art adopts a two-position three-way proportional valve, which requires an additional control oil circuit for control, resulting in a complex oil circuit structure of the proportional valve.

[0005] The present invention provides a hydraulic half-bridge high water-base proportional valve, comprising:

[0006] A valve body, wherein the valve body is formed with a first liquid inlet, a second liquid inlet and a liquid outlet;

[0007] A main valve core, the main valve core is movably arranged inside the valve body, a first row of holes and a second row of holes are formed on the surface of the main valve core, and 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, and the position of the main valve core inside the valve body is adjusted by the liquid supply of the first liquid inlet;

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

[0009] A liquid return valve core, the liquid return valve core is movably arranged between the valve body and the main valve core, and is connected to the main valve sleeve through a first elastic member, a cavity is formed on the side of the liquid return valve core away from the first elastic member, the half-bridge input variable throttle port is connected between the cavity and the second liquid inlet, and the half-bridge output variable throttle port is connected between the cavity and the liquid discharge port, and the position of the liquid 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 action force of the first elastic member.

[0010] According to the hydraulic half-bridge high water base proportional valve provided by the present invention, when the first liquid inlet supplies liquid, driving the main valve core to move to the first position, the flow rate of the half-bridge input variable throttle port to the cavity decreases, and the flow rate of the half-bridge output variable throttle port to the drain port increases; until the main valve core moves to the first position, the second liquid inlet is disconnected from the second row of holes, and the first row of holes is connected to the drain port through the first elastic member, so as to discharge liquid through the drain port;

[0011] When the first liquid inlet stops supplying liquid, the main valve core moves to the second position, the flow rate of the half-bridge input variable throttle port to the cavity increases, and the flow rate of the half-bridge output variable throttle port to the drain port decreases; until the main valve core moves to the second position, the second liquid inlet is connected to the second row of holes to discharge 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.

[0012] According to the hydraulic half-bridge high water base proportional valve provided by the present invention, the half-bridge input variable throttle port includes a first slot body, and the half-bridge output variable throttle port includes a second slot body; wherein,

[0013] A first gap is formed between the first groove body and the second liquid inlet for liquid to pass through, and 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 for liquid to pass through is formed between the second groove body and the cavity, and 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 half-bridge high water-based proportional valve provided by the present invention, a guide hole is further 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 half-bridge high water-based proportional valve provided by the present invention, a liquid hole is also formed on the main valve sleeve, one end of the liquid hole is connected to the second liquid inlet, and when the main valve core moves to the second position, the other end of the liquid hole is connected to the second row of holes.

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

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

[0019] A rear end cover is fixed to the other end of the valve body, a working port is formed on the rear end cover, and the working port is communicated 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, and the main valve core is connected to the rear end cover via a second elastic member. 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 member.

[0020] The hydraulic semi-bridge high water-based proportional valve provided according to the present invention also includes: a balancing valve core, which is arranged at one end of the main valve core close to the front end cover, and the balancing valve core is formed with a third groove body on the side close to the first liquid inlet, and the liquid supply from the first liquid inlet pushes the balancing valve core through the third groove body to drive the main valve core to move to the first position.

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

[0022] The hydraulic semi-bridge high water-based proportional valve provided in 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 the connecting rod passes through the balancing valve core and is fixedly connected to the balancing valve core.

[0023] The hydraulic half-bridge high water-based proportional valve provided according to the present invention further includes: a connecting disk, which is fixed to one end of the balancing valve core close to the front end cover, and the connecting disk is fixedly connected to the other end of the connecting rod.

[0024] The present invention provides a hydraulic half-bridge high-water-based proportional valve, which comprises a valve body, a main valve core, a main valve sleeve and a liquid return valve core; the valve body is formed with a first liquid inlet, a second liquid inlet and a liquid discharge port; the main valve core is movably arranged inside the valve body, a first row of holes and a second row of holes are formed on the surface of the main valve core, and 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, and the position of the main valve core inside the valve body is adjusted by the liquid supply of the first liquid inlet; the main valve sleeve is fixed inside the valve body and sleeved on the main valve The outer side of the core; the return valve core is movably arranged between the valve body and the main valve core, and is connected to the main valve sleeve through a first elastic member, a cavity is formed on the side of the return valve core away from the first elastic member, the half-bridge input variable throttle port is connected between the cavity and the second liquid inlet, and the half-bridge output variable throttle port is connected between the cavity and the liquid discharge port, and 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 action force of the first elastic member.

[0025] When the first liquid inlet supplies liquid, the main valve core is driven 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 liquid inlet is disconnected from the second row of holes, and the first row of holes is connected to the drain port through the first elastic member to discharge liquid through the drain port.

[0026] When the first liquid 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 liquid inlet is connected to the second row of holes to discharge 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 half-bridge high water-based proportional valve, which has the following beneficial effects:

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

[0029] On the other hand, by controlling the liquid supply flow / pressure of the first liquid inlet, the displacement of the main valve core, that is, the valve opening, is controlled, and then the output flow of the main valve is controlled, which has the advantages of simple and timely regulation, simple valve core structure and light weight. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

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

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

[0033] Figure 3 yes Figure 1 Partial schematic diagram of B in the figure.

[0034] Figure 4 yes Figure 2 Partial schematic diagram of C in the figure.

[0035] Reference numerals:

[0036] 1: front cover; 2: valve body; 3: oil inlet plug; 4: liquid return valve core; 5: first elastic member; 6: main valve sleeve; 7: second elastic member; 8: rear cover; 9: main valve core; 10: balance valve core; 11: connecting rod; 12: connecting plate; 13: displacement sensor; 14: oil return plug; 2.1: first liquid inlet; 2.2: liquid discharge; 2.3: second liquid inlet; 2.4: half-bridge input variable throttle; 2.5: cavity; 2.6: half-bridge output variable throttle; 8.1: working port; 9.1: guide hole; 9.2: first row of holes; 9.3: second row of holes. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are 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.

[0038] In the description of the present embodiment, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like 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 embodiment and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present embodiment.

[0039] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this embodiment, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0040] In this embodiment, unless otherwise clearly specified and limited, the terms "set", "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances.

[0041] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0042] Combine the following Figure 1-Figure 4 The present invention describes a hydraulic half-bridge high water base proportional valve. The hydraulic half-bridge high water base proportional valve comprises: a valve body 2, a main valve core 9, a main valve sleeve 6 and a liquid return valve core 4. In the present invention, the front end cover 1 is defined as the front end of the proportional valve, and the rear end cover 8 is defined as the rear end of the proportional valve. Figure 1 and Figure 2 In the structure shown in , the left end is the front end and the right end is the rear end.

[0043] The valve body 2 is formed with a first liquid inlet 2.1, a second liquid inlet 2.3 and a liquid discharge port 2.2; the main valve core 9 is movably arranged inside the valve body 2, and 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, and 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, and the position of the main valve core 9 inside the valve body 2 is adjusted by the liquid supply of the first liquid inlet 2.1; the main valve sleeve 6 is fixed inside the valve body 2 and sleeved on the outer side of the main valve core 9; the liquid return valve core 4 is movably arranged at A cavity 2.5 is formed between the valve body 2 and the main valve core 9, and is connected to the main valve sleeve 6 through the first elastic member 5. The half-bridge input variable throttle port 2.4 is connected between the cavity 2.5 and the second liquid inlet 2.3, and the half-bridge output variable throttle port 2.6 is connected between the cavity 2.5 and the liquid discharge port 2.2. The position of the liquid 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 action of the first elastic member 5.

[0044] Specifically, liquid is fed into and discharged from the valve body 2 through the first liquid inlet 2.1, the second liquid inlet 2.3 and the liquid discharge port 2.2. The main valve core 9 is a hollow structure with a flow channel formed therein, which can connect the first row of holes 9.2 and the second row of holes 9.3, and discharge liquid to the rear end, that is, the working port 8.1 of the rear end cover 8 through the flow channel. The main valve core 9 can move axially inside the valve body 2, and the power source of its movement is the liquid supply pressure of the first liquid inlet 2.1 and the elastic reset of the second elastic member 7 (specifically described in the subsequent embodiments). The movement of the main valve core 9 along the axial direction controls the flow of the half-bridge input variable throttle port 2.4 and the half-bridge output variable throttle port 2.6. The flow changes of the half-bridge input variable throttle port 2.4 and the half-bridge output variable throttle port 2.6 control the liquid pressure in the cavity 2.5 on one side of the return valve core 4, and 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 member 5.

[0045] Furthermore, the first liquid inlet 2.1 is a control port, which can control the movement of the main valve core 9; the second liquid inlet 2.3 is for supplying liquid to the main valve core 9, and a liquid inlet channel is formed inside the valve body 2, and an oil inlet screw plug 3 is installed on the valve body 2 to block the liquid inlet channel; the liquid discharge port 2.2 is a reflux port, which is used to reflux liquid, and a return liquid channel is formed inside the valve body 2, and an oil return screw plug 14 is installed on the valve body 2 to block the return liquid channel.

[0046] The present invention is in specific operation:

[0047] When the first liquid inlet 2.1 supplies liquid, driving 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 discharge port 2.2 increases; until the main valve core 9 moves to the first position, the second liquid 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 discharge port 2.2 through the first elastic member 5, so that liquid is discharged through the discharge port 2.2;

[0048] When the first liquid 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 discharge port 2.2 decreases; until 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 to discharge liquid to the rear end of the main valve core 9, and the return valve core 4 moves between the first row of holes 9.2 and the discharge port 2.2 to disconnect the first row of holes 9.2 from the discharge port 2.2.

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

[0050] exist Figure 3 Schematic diagram and Figure 4 In the schematic diagram, the movement of the valve body 2 can be achieved by controlling the liquid supply to the first liquid inlet 2.1. As the 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 the valve body 2 is in the first position, the second liquid inlet 2.3 is misaligned and disconnected from the second row of holes 9.3, the half-bridge input variable throttle 2.4 is in the minimum position, its input flow is minimum, the half-bridge output variable throttle 2.6 is in the maximum position, its output flow is maximum, the pressure in the cavity 2.5 is minimum, and the liquid return valve core 4 is at the far left end due to the action of the first elastic member 5, and the first row of holes 9.2 is connected to the liquid discharge port 2.2; when the valve body 2 is in the second position, the second liquid inlet 2.3 is opposite to and connected to the second row of holes 9.3, the half-bridge input variable throttle 2.4 is in the maximum position, its input flow is maximum, the half-bridge output variable throttle 2.6 is in the minimum position, its output flow is minimum, the pressure in the cavity 2.5 is maximum, and the action of the first elastic member 5 is overcome, so that the liquid return valve core 4 is at the far right end, blocking between the first row of holes 9.2 and the liquid discharge port 2.2, so that the first row of holes 9.2 and the liquid discharge port 2.2 are disconnected.

[0051] In the initial state, liquid is supplied to the first liquid inlet 2.1 and the second liquid inlet 2.3 respectively, at which time the main valve port is closed, that is, the second liquid 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 liquid outlet 2.2. The liquid supply flow / pressure of the first liquid inlet 2.1 is gradually reduced, the main valve core 9 moves to the second position (i.e., the left end), and the main valve port is opened. The main valve port opening is different, and the output flow is different. Finally, the displacement of the main valve core 9, that is, the control of the valve port opening, is achieved by controlling the liquid supply flow / pressure of the first liquid inlet 2.1, thereby controlling the output flow of the main valve.

[0052] The present invention provides a hydraulic half-bridge high water-based proportional valve, which, on the one hand, adopts the oil circuit structure of the hydraulic half-bridge to control the return liquid valve core 4, so as to replace the traditional solution which requires an additional pilot valve to control the structure of the return liquid valve core 4, thereby simplifying the structure and having the advantages of simple mechanical and electrical connections; on the other hand, by controlling the liquid supply flow / pressure of the first liquid inlet 2.1, the displacement of the main valve core 9, that is, the control of the valve port opening, is achieved, thereby controlling the output flow of the main valve, which 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 2.4 includes a first slot body, and the half-bridge output variable throttle 2.6 includes a second slot body. A first gap for liquid to pass through is formed between the first slot body and the second liquid inlet 2.3, and 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 slot body and the cavity 2.5, and 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, the half-bridge input variable throttle 2.4 and the half-bridge output variable throttle 2.6 both adopt a slot structure. During the movement of the main valve core 9, a gap of adjustable size is formed between the liquid supply channel of the second liquid inlet 2.3 and the cavity 2.5, respectively, and the gap controls the liquid inlet flow / pressure and the liquid discharge flow / pressure, and the pressure generated in the cavity 2.5 by the liquid inlet and discharge flow / pressure is compared with the elastic force provided by the first elastic member 5. When the pressure in the cavity 2.5 is greater than the elastic force of the first elastic member 5, the first elastic member 5 is compressed and the liquid return valve core 4 moves to the right. When the pressure in the cavity 2.5 is less than the elastic force of the first elastic member 5, the first elastic member 5 is extended and the liquid return valve core 4 moves to the left.

[0054] In one embodiment of the present invention, a guide hole 9.1 is further formed on the main valve core 9, and the guide hole 9.1 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 into the main valve port through the guide hole 9.1 provided on the main valve core 9, thereby reducing the noise and wear of the valve port caused by cavitation.

[0055] In one embodiment of the present invention, a liquid-passing hole is further formed on the main valve sleeve 6, one end of the liquid-passing hole is connected to the second liquid inlet 2.3, and when the main valve core 9 moves to the second position, the other end of the liquid-passing hole 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-passing hole, and when the main valve core 9 moves to the first position, the liquid-passing hole 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. Among them, the front cover 1 is fixed at one end of the valve body 2; the rear cover 8 is fixed at the other end of the valve body 2, and a working port 8.1 is formed on the rear cover 8, and the working port 8.1 is communicated with the inside of the main valve core 9. The front cover 1, the valve body 2 and the rear cover 8 form a cavity for accommodating the main valve core 9, and the main valve core 9 is connected to the rear cover 8 through the second elastic member 7. The position of the main valve core 9 in the cavity is adjusted by the liquid supply of the first liquid inlet 2.1 and the force of the second elastic member 7. In this embodiment, the front cover 1 and the 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, and the second elastic member 7 is arranged between the rear cover 8 and the main valve core 9. When the first liquid inlet 2.1 does not supply liquid or the liquid supply is reduced, the main valve core 9 can move to the second position, that is, move to the left, under the leading action of the second elastic member 7. In addition, the liquid inside the main valve core 9 can be discharged from the inside through the working port 8.1.

[0057] In one embodiment of the present invention, the hydraulic half-bridge high water-based proportional valve further includes: a balancing valve core 10, the balancing valve core 10 is arranged at one end of the main valve core 9 close to the front end cover 1, and the balancing valve core 10 is formed with a third groove body on the side close to the first liquid inlet 2.1, and the liquid supplied from the first liquid inlet 2.1 pushes the balancing valve core 10 through the third groove body to drive the main valve core 9 to move to the first position. In this embodiment, the balancing valve core 10 is located at the front end of the main valve core 9 and is fixedly connected thereto, and is supplied with liquid from the first liquid inlet 2.1, and overcomes the action of the second elastic member 7, driving the balancing valve core 10 to move to the right, and the main valve core 9 moves to the right synchronously. This embodiment adopts a hydraulic balanced structure and a hollow valve core structure composed of the main valve core 9 and the balancing valve core 10, which overcomes the contradictory relationship between valve core balance and response in the design of traditional water-based hydraulic valves, and has the advantages of light valve core weight 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 the displacement sensor 13 is connected to one end of the balancing valve core 10, and is used to detect the displacement of the balancing valve core 10 and the main valve core 9. In this embodiment, the displacement of the balancing valve core 10 and the main valve core 9 is monitored by the displacement sensor 13, and the operating state of the proportional valve can be monitored by the displacement.

[0059] In one embodiment of the present invention, the hydraulic half-bridge high water-based proportional valve further includes: a connecting rod 11, one end of the connecting rod 11 is fixedly connected to the main valve core 9, and the other end of the connecting rod 11 passes through the balancing valve core 10 and is fixedly connected to the balancing valve core 10. In this embodiment, the balancing valve core 10 is connected and fixed to the main valve core 9 through the connecting rod 11, so that the balancing valve core 10 moves synchronously with the main valve core 9. Preferably, in order to ensure the connection stability between the balancing 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 half-bridge high water-based proportional valve further includes: a connecting plate 12, the connecting plate 12 is fixed to one end of the balancing valve core 10 close to 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 balancing valve core 10 is parallel to the end face of the main valve core 9, and to ensure the stability of the main valve core 9 in axial movement.

[0061] In one embodiment of the present invention, the first elastic member 5 and the second elastic member 7 are both pressure springs. Under the action of the first elastic member 5, the liquid return valve core 4 has a tendency to move toward the side of the cavity 2.5; under the action of the second elastic member 7, the main valve core 9 has a tendency to move toward the front end. Figure 1 and Figure 2 In the structure shown, the first elastic member 5 provides a leftward thrust for the liquid return valve core 4 , and the second elastic member 7 provides a leftward thrust for 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, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

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

2. The hydraulic half-bridge high water-based proportional valve according to claim 1, characterized in that: When the first liquid inlet (2.1) supplies liquid, driving the main valve core (9) to move toward the first position, the flow rate of the half-bridge input variable throttle port (2.4) to the cavity (2.5) decreases, and the flow rate of the half-bridge output variable throttle port (2.6) to the liquid discharge port (2.2) increases; until the main valve core (9) moves to the first position, the second liquid 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 liquid discharge port (2.2) through the first elastic member (5), so as to discharge liquid through the liquid discharge port (2.2); When the first liquid inlet (2.1) stops supplying liquid, the main valve core (9) moves to the second position, the flow rate of the half-bridge input variable throttle port (2.4) to the cavity (2.5) increases, and the flow rate of the half-bridge output variable throttle port (2.6) to the liquid discharge port (2.2) decreases; until 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) to discharge liquid to the rear end of the main valve core (9), and the liquid return valve core (4) moves to between the first row of holes (9.2) and the liquid discharge port (2.2) to disconnect the first row of holes (9.2) from the liquid discharge port (2.2).

3. The hydraulic half-bridge high water-base proportional valve according to claim 2, characterized in that: The half-bridge input variable throttle (2.4) comprises a first slot body, and the half-bridge output variable throttle (2.6) comprises a second slot body; wherein, A first gap is formed between the first groove body and the second liquid inlet (2.3) for liquid to pass through, and 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 body and the cavity (2.5), and 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 half-bridge high water-base proportional valve according to claim 1, characterized in that: A flow guide hole (9.1) is also formed on the main valve core (9), and the flow guide hole (9.1) connects the interior of the main valve core (9) with the second row of holes (9.3).

5. The hydraulic half-bridge high water-base proportional valve according to claim 2 or 3, characterized in that: The main valve sleeve (6) is also provided with a liquid passage hole, one end of which is in communication with 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 in communication with the second row of holes (9.3).

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

7. The hydraulic half-bridge high water-base proportional valve according to claim 6, characterized in that: Also includes: A balancing valve core (10), wherein the balancing valve core (10) is arranged at one end of the main valve core (9) close to the front end cover (1), and a third groove body is formed on the balancing valve core (10) at a side close to the first liquid inlet (2.1), and the liquid supplied from the first liquid inlet (2.1) pushes the balancing valve core (10) through the third groove body to drive the main valve core (9) to move to the first position.

8. The hydraulic half-bridge high water-base proportional valve according to claim 7, characterized in that: Also includes: A displacement sensor (13), wherein a sensing end of the displacement sensor (13) is connected to one end of the balancing valve core (10) and is used to detect the displacement of the balancing valve core (10) and the main valve core (9).

9. The hydraulic half-bridge high water-base proportional valve according to claim 7, characterized in that: Also includes: A connecting rod (11), one end of the connecting rod (11) being fixedly connected to the main valve core (9), and the other end of the connecting rod (11) passing through the balancing valve core (10) and being fixedly connected to the balancing valve core (10).

10. The hydraulic half-bridge high water-base proportional valve according to claim 9, characterized in that: Also includes: A connecting plate (12), the connecting plate (12) being fixed to one end of the balancing valve core (10) close to the front end cover (1), and the connecting plate (12) being fixedly connected to the other end of the connecting rod (11).

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