A hydraulic booster proportional valve

Abstract

The present invention discloses a hydraulic power-assisted proportional valve, comprising a valve body, wherein two valve sleeves are respectively distributed on both sides of a central axis in the valve body, and valve cores are arranged in the valve sleeves, wherein the two valve cores on one side of the central axis respectively comprise a first positive proportional valve core and a first negative proportional valve core, and the two valve cores on the other side of the central axis respectively comprise a second positive proportional valve core and a second negative proportional valve core; the valve body is provided with a controller for rotating around the central axis to squeeze the valve core, and the valve sleeve is provided with an elastic member for making the valve core rebound; a liquid inlet and a liquid discharge port are provided on the side of the valve sleeve, a first inlet corresponding to the liquid inlet and a first outlet corresponding to the liquid discharge port are provided on the side of the first positive proportional valve core and the second positive proportional valve core, and a second inlet corresponding to the liquid inlet and a second outlet corresponding to the liquid discharge port are provided on the side of the first negative proportional valve core and the second negative proportional valve core.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic control handles, and in particular to a hydraulic booster proportional valve. Background Art

[0002] On some current construction machinery, a series of mechanical actions, such as steering and braking, are controlled by pilot hydraulic control handles, and different actions require different control valves to control; and the travel system of construction machinery often requires inverse proportional hydraulic control valves to meet certain special needs, such as bulldozer steering and braking actions, which require positive and negative proportional hydraulic control valves to respectively realize the engagement and separation of the steering and braking clutches; but traditional hydraulic control handles are mostly positive proportional hydraulic pilot valves. To realize the steering and braking functions, the system needs to add corresponding steering valves to obtain the required pressure curve, which will increase the system response speed and cost, and also increase the system failure points. Summary of the invention

[0003] In view of this, the present invention proposes a hydraulic power-assisted proportional valve, which can solve the problem that a hydraulic control handle needs to be added to enable engineering machinery to complete specific continuous actions.

[0004] The technical solution of the present invention is achieved in this way:

[0005] A hydraulic booster proportional valve comprises a valve body, wherein two valve sleeves are respectively arranged on both sides of the central axis of the valve body, wherein valve cores are arranged in the valve sleeves, wherein the two valve cores on one side of the central axis respectively contain a first positive proportional valve core and a first negative proportional valve core, and the two valve cores on the other side of the central axis respectively contain a second positive proportional valve core and a second negative proportional valve core; the first positive proportional valve core and the second positive proportional valve core have the same structure, and the first negative proportional valve core and the second negative proportional valve core have the same structure;

[0006] The valve core has a cavity inside and an oil port at the bottom; the valve body is provided with a controller for rotating around the central axis to squeeze the valve core, and the valve sleeve is provided with an elastic member for making the valve core rebound; a liquid inlet and a liquid drain are provided on the side of the valve sleeve, a first inlet corresponding to the liquid inlet and a first outlet corresponding to the liquid drain are provided on the side of the first positive proportional valve core and the second positive proportional valve core, and a second inlet corresponding to the liquid inlet and a second outlet corresponding to the liquid drain are provided on the side of the first negative proportional valve core and the second negative proportional valve core;

[0007] When the controller is in an initial state where the valve core is not acted on, the first inlet is located below the liquid inlet and is not connected to each other, and the first outlet is connected to the liquid discharge port; the second inlet is connected to the liquid inlet, and the second outlet is located above the liquid discharge port and is not connected to each other;

[0008] When the controller acts on the valve core, the first inlet is connected to the liquid inlet, and the first outlet is located below the liquid inlet and is not connected to each other; the second inlet is located below the liquid inlet and is not connected to each other, and the second outlet is connected to the liquid drain port.

[0009] As a further optional solution of the hydraulic power-assisted proportional valve, a vertical channel is provided in the valve body, the valve sleeve is provided in the channel, and the valve sleeve and the valve body are sealed and connected via a plurality of sealing rings.

[0010] As a further optional scheme of the hydraulic power-assisted proportional valve, a mounting plate is provided on the top of the valve body, and a pressure rod is provided on the top of the valve core, and the pressure rod passes through the mounting plate from the channel; the controller is hinged to the mounting plate, and when the controller rotates relative to the mounting plate, the pressure rod is squeezed to make the valve core move downward.

[0011] As a further optional solution of the hydraulic booster proportional valve, the controller includes a handle hinged to the mounting plate and a pressure cover arranged on the handle, and when the handle is rotated, the pressure cover squeezes the pressure rod.

[0012] As a further optional solution of the hydraulic power-assisted proportional valve, a support plate located below the valve core is provided in the valve sleeve, the elastic member is located between the support plate and the valve core, and a hole for oil to pass through is provided on the support plate.

[0013] As a further optional solution of the hydraulic power-assisted proportional valve, the elastic member is a spring, one end of which abuts against the support plate, and the other end of which abuts against the bottom of the valve core.

[0014] As a further optional solution of the hydraulic booster proportional valve, the support plate is a retaining spring, a mounting groove is provided in the valve sleeve, and the retaining spring is installed in the mounting groove.

[0015] As a further optional solution of the hydraulic booster proportional valve, a pipeline is provided in the valve body to connect the liquid inlet and the liquid drain on the valve sleeve to realize liquid supply and liquid drain.

[0016] As a further optional solution of the hydraulic booster proportional valve, the four valve sleeves on the valve body are equidistantly distributed along the circumferential direction.

[0017] As a further optional solution of the hydraulic booster proportional valve, the diameters of the first inlet and the second inlet are half of the liquid inlet, and the diameters of the first outlet and the second outlet are half of the liquid drain.

[0018] The beneficial effects of the present invention are as follows: through the structure of the hydraulic power-assisted proportional valve having a positive proportional valve and a negative proportional valve, steering and braking can be controlled simultaneously, thereby improving the continuity of the action; reducing the conversion of the intermediate valve body of the system, reducing the cost, and simplifying the system; the combination of positive and negative proportional technologies enhances the comfort of operation, which is conducive to improving technical competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic top view of a hydraulic booster proportional valve according to the present invention;

[0021] Figure 2 is a cross-sectional schematic diagram of the first direct proportional valve core and the second inverse proportional valve core;

[0022] Figure 3 The figure is a schematic diagram of a hydraulic booster proportional valve of the present invention.

[0023] In the figure: 1, valve body; 11, mounting plate; 2, valve sleeve; 21, support plate; 3a, first positive proportional valve core; 3b, second negative proportional valve core; 3c, first negative proportional valve core; 3d, second positive proportional valve core; 4, elastic member; 5, controller; 51, handle; 52, gland; 6, pressure rod; 7, sealing ring;

[0024] P, liquid inlet; P1, first inlet; P2, second inlet;

[0025] T, drain port; t1, first outlet; t2, second outlet;

[0026] L, central axis; X, first direction; Y, second direction;

[0027] A. Oil port of the first proportional valve core;

[0028] B. Oil port of the second inverse proportional valve core;

[0029] C. Oil port of the first inverse proportional valve core;

[0030] D. Oil port of the second proportional valve core. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention are described clearly and completely below. 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.

[0032] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "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.

[0033] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" 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. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a 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. A first feature being "below", "below" or "below" a 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.

[0035] refer to Figure 1-3 , shows a hydraulic booster proportional valve, including a valve body 1, wherein two valve sleeves 2 are respectively distributed on both sides of the central axis L in the valve body 1, and a valve core is arranged in the valve sleeve 2, wherein the two valve cores on one side of the central axis L are respectively a first positive proportional valve core 3a and a first negative proportional valve core 3c, and the two valve cores on the other side of the central axis L are respectively a second positive proportional valve core 3d and a second negative proportional valve core 3b; the first positive proportional valve core 3a and the second positive proportional valve core 3d have the same structure, and the first negative proportional valve core 3c and the second negative proportional valve core 3b have the same structure;

[0036] The valve core has a cavity inside and an oil port is provided at the bottom; the valve body 1 is provided with a controller 5 for rotating around the central axis L to squeeze the valve core, and the valve sleeve 2 is provided with an elastic member 4 for making the valve core rebound; the side of the valve sleeve 2 is provided with a liquid inlet P and a liquid discharge port T, the side of the first positive proportional valve core 3a and the second positive proportional valve core 3d are both provided with a first inlet P1 corresponding to the liquid inlet P and a first outlet t1 corresponding to the liquid discharge port T, and the side of the first negative proportional valve core 3c and the second negative proportional valve core are both provided with a second inlet P2 corresponding to the liquid inlet P and a second outlet t2 corresponding to the liquid discharge port T;

[0037] When the controller 5 is in an initial state where the valve core is not acted on, the first inlet P1 is located below the liquid inlet P and is not connected to each other, and the first outlet t1 is connected to the liquid discharge port T; the second inlet P2 is connected to the liquid inlet P, and the second outlet t2 is located above the liquid discharge port T and is not connected to each other;

[0038] When the controller 5 acts on the valve core, the first inlet P1 is connected to the liquid inlet P, and the first outlet t1 is located below the liquid inlet P and is not connected to each other; the second inlet P2 is located below the liquid inlet P and is not connected to each other, and the second outlet t2 is connected to the liquid drain T.

[0039] Specifically, the controller 5 can be manipulated to rotate around the central axis L so as to be biased towards the first direction X or the second direction Y;

[0040] In the initial state, the controller 5 is in the middle position, that is, the controller 5 is not biased toward the first direction X or the second direction Y, and the controller 5 does not act on any valve core. At this time, all valve cores are at the highest height they can reach; Figure 2, at this time, the first inlet P1 of the first positive proportional valve core 3a corresponds to the inner wall of the valve sleeve 2 above the liquid inlet P, and the first inlet P1 of the first positive proportional valve core 3a is not connected to the liquid inlet P; and the first outlet t1 of the first positive proportional valve core 3a is connected to the drain port T, and the oil in the first positive proportional valve core 3a is discharged from the drain port T and cannot be replenished; at this time, the output pressure of the oil port A of the first positive proportional valve core 3a is zero; the structure and state of the second positive proportional valve core 3d are the same as those of the first positive proportional valve core 3a; in addition, the second inlet P2 of the second inverse proportional valve core 3b is connected to the liquid inlet P, and the second outlet t2 of the second inverse proportional valve core 3b corresponds to the inner wall of the valve sleeve 2 above the drain port T, and the second outlet t2 of the second inverse proportional valve core 3b is not connected to the drain port T, and the oil in the second inverse proportional valve core 3b is constantly replenished and cannot be discharged; at this time, the output pressure of the oil port B of the first inverse proportional valve core 3c reaches the maximum, and the structure and state of the first inverse proportional valve core 3c are the same as those of the second inverse proportional valve core 3b.

[0041] When the controller 5 is biased toward the first direction X, the first positive proportional valve core 3a and the first negative proportional valve core 3c are squeezed and descend; during the descent of the first positive proportional valve core 3a, its first inlet P1 begins to communicate with the liquid inlet P, and as the height of the first positive proportional valve core 3a decreases, the cross-sectional area of ​​the first inlet P1 communicating with the liquid inlet P increases, while the cross-sectional area of ​​the first outlet t1 of the first positive proportional valve core 3a communicating with the liquid drain port T decreases; when the first positive proportional valve core 3a drops to the lowest height, the first outlet t1 of the first positive proportional valve core 3a corresponds to the inner wall of the valve sleeve 2 below the liquid drain port T, and the two are not connected; and the cross-sectional area of ​​the first inlet P1 of the first positive proportional valve core 3a communicating with the liquid inlet P reaches the maximum, and this When the first positive proportional valve core 3a reaches the maximum output pressure of the oil port A; in addition, during the process of the first negative proportional valve core 3c descending, the cross-sectional area of ​​the second inlet P2 communicating with the liquid inlet P decreases, while the second outlet t2 begins to communicate with the drain port T and the cross-sectional area of ​​communication gradually increases; when the first negative proportional valve core 3c descends to the lowest height, the second inlet P2 corresponds to the inner wall of the valve sleeve 2 below the liquid inlet P, and the two are not connected; and the cross-sectional area of ​​the second outlet t2 of the first negative proportional valve core 3c communicating with the drain port T reaches the maximum, at which time the output pressure of the oil port C of the first negative proportional valve core 3c is zero; it should be noted that at this time, the second positive proportional valve and the second negative proportional valve are at the highest height they can reach, and the states of the two are in the initial state. When the first positive proportional valve core 3a and the first negative proportional valve core 3c return under the action of the elastic member 4, the process is opposite to the above process.

[0042] When the controller 5 is biased toward the second direction Y, the second positive proportional valve core 3d and the second negative proportional valve core 3b are squeezed and descend; during the descent of the second positive proportional valve core 3d, the first inlet P1 of the second positive proportional valve core 3d begins to communicate with the liquid inlet P, and as the height of the second positive proportional valve core 3d decreases, the cross-sectional area of ​​the first inlet P1 communicating with the liquid inlet P increases, while the cross-sectional area of ​​the first outlet t1 of the second positive proportional valve core 3d communicating with the liquid drain port T decreases; when the second positive proportional valve core 3d descends to the lowest height, the first outlet t1 of the second positive proportional valve core 3d corresponds to the inner wall of the valve sleeve 2 below the liquid drain port T, and the two are not connected; and the cross-sectional area of ​​the first inlet P1 of the second positive proportional valve core 3d communicating with the liquid inlet P reaches the maximum, and this When the second positive proportional valve core 3d reaches the maximum output pressure of the oil port D; in addition, during the process of the second negative proportional valve core 3b descending, the cross-sectional area of ​​the second inlet P2 of the second negative proportional valve core 3b communicating with the liquid inlet P decreases, and its second outlet t2 begins to communicate with the drain port T and the cross-sectional area of ​​communication gradually increases; when the second negative proportional valve core 3b descends to the lowest height, the second inlet P2 corresponds to the inner wall of the valve sleeve 2 below the liquid inlet P, and the two are not connected; and the cross-sectional area of ​​the second outlet t2 of the second negative proportional valve core 3b communicating with the drain port T reaches the maximum, at which time the output pressure of the oil port B of the second negative proportional valve core 3b is zero; it should be noted that at this time, the first positive proportional valve and the first negative proportional valve are at the highest height they can reach, and the states of both are in the initial state. When the second positive proportional valve core 3d and the second negative proportional valve core 3b return under the action of the elastic member 4, the process is opposite to the above process.

[0043] In this way, through the structure of the hydraulic power proportional valve with a positive proportional valve and a negative proportional valve, steering and braking can be controlled simultaneously to improve the continuity of the action; the conversion of the intermediate valve body 1 of the system is reduced, the cost is reduced, and the system is simplified; the combination of positive and negative proportional technologies enhances the operating comfort and is conducive to improving technical competitiveness.

[0044] Specifically, in order to facilitate the first inlet P1, the first outlet t1, the second inlet P2 and the second outlet t2 to correspond to the liquid inlet P and the liquid discharge port T during the descending and ascending process, refer to Figure 2, the diameters of the first inlet P1 and the second inlet P2 are half of the liquid inlet P, and the diameters of the first outlet t1 and the second outlet t2 are half of the liquid discharge port T. In this way, when the first inlet P1 is just completely connected with the liquid inlet P, the first outlet t1 is just disconnected from the liquid discharge port T; and when the second inlet P2 is just completely disconnected from the liquid inlet P, the second outlet t2 is just completely connected with the liquid discharge port T; the ineffective descent and rise of the valve core can be avoided, and the control efficiency can be improved.

[0045] Specifically, in order to facilitate the use of the controller 5 to squeeze the valve core to move it downward, refer to Figure 2 , a vertical passage is arranged in the valve body 1, the valve sleeve 2 is arranged in the passage, and the valve sleeve 2 and the valve body 1 are sealed and connected by a plurality of sealing rings 7. A mounting plate 11 is arranged on the top of the valve body 1, and a pressure rod 6 is arranged on the top of the valve core, and the pressure rod 6 passes through the mounting plate 11 from the passage; the controller 5 is hinged to the mounting plate 11, and when the controller 5 rotates relative to the mounting plate 11, the pressure rod 6 is squeezed to make the valve core move downward. The controller 5 includes a handle 51 hinged to the mounting plate 11 and a pressure cover 52 arranged on the handle 51, and when the handle 51 is rotated, the pressure cover 52 squeezes the pressure rod 6.

[0046] Specifically, in order to facilitate the elastic member 4 to make the valve core rebound, refer to Figure 2 The valve sleeve 2 is provided with a support plate 21 below the valve core, the elastic member 4 is located between the support plate 21 and the valve core, and the support plate 21 is provided with a hole for oil to pass through. The elastic member 4 is a spring, one end of which abuts against the support plate 21, and the other end abuts against the bottom of the valve core. More preferably, in order to facilitate installation, a mounting groove is provided in the valve sleeve 2, and the retaining ring is installed in the mounting groove.

[0047] Specifically, in order to facilitate the input of oil through the liquid inlet P and the discharge of oil through the liquid drain port T, refer to Figure 2 A pipeline is provided in the valve body 1 to connect the liquid inlet P and the liquid discharge port T on the valve sleeve 2 to realize liquid supply and liquid discharge.

[0048] For details of the above scheme, please refer to Figure 1 In order to make the force of operating the controller 5 to deflect in the first direction X or the second direction Y the same, the four valve sleeves 2 on the valve body 1 are equidistantly distributed along the circumferential direction. In this way, the structures on both sides of the central axis L are the same, and the operator can operate the controller 5 more smoothly.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A hydraulic booster proportional valve, characterized in that: It comprises a valve body, wherein two valve sleeves are respectively distributed on both sides of the central axis of the valve body, and valve cores are arranged in the valve sleeves, wherein the two valve cores on one side of the central axis are respectively a first positive proportional valve core and a first negative proportional valve core, and the two valve cores on the other side of the central axis are respectively a second positive proportional valve core and a second negative proportional valve core; the first positive proportional valve core and the second positive proportional valve core have the same structure, and the first negative proportional valve core and the second negative proportional valve core have the same structure; The valve core has a cavity inside and an oil port at the bottom; the valve body is provided with a controller for rotating around the central axis to squeeze the valve core, and the valve sleeve is provided with an elastic member for making the valve core rebound; a liquid inlet and a liquid drain are provided on the side of the valve sleeve, a first inlet corresponding to the liquid inlet and a first outlet corresponding to the liquid drain are provided on the side of the first positive proportional valve core and the second positive proportional valve core, and a second inlet corresponding to the liquid inlet and a second outlet corresponding to the liquid drain are provided on the side of the first negative proportional valve core and the second negative proportional valve core; When the controller is in an initial state where the valve core is not acted on, the first inlet is located below the liquid inlet and is not connected to each other, and the first outlet is connected to the liquid discharge port; the second inlet is connected to the liquid inlet, and the second outlet is located above the liquid discharge port and is not connected to each other; When the controller acts on the valve core, the first inlet is connected to the liquid inlet, and the first outlet is located below the liquid inlet and is not connected to each other; the second inlet is located below the liquid inlet and is not connected to each other, and the second outlet is connected to the liquid drain port; A vertical channel is provided in the valve body, the valve sleeve is provided in the channel, and the valve sleeve and the valve body are sealed and connected via a plurality of sealing rings; A mounting plate is provided on the top of the valve body, and a pressure rod is provided on the top of the valve core, and the pressure rod passes through the mounting plate from the channel; the controller is hinged to the mounting plate, and when the controller rotates relative to the mounting plate, the pressure rod is pressed to move the valve core downward; The controller comprises a handle hinged to the mounting plate and a pressure cover arranged on the handle, and when the handle is rotated, the pressure cover presses the pressure rod; The four valve sleeves on the valve body are equidistantly distributed along the circumferential direction.

2. A hydraulic booster proportional valve according to claim 1, characterized in that: A support plate located below the valve core is arranged in the valve sleeve, the elastic member is located between the support plate and the valve core, and a hole for oil to pass through is arranged on the support plate.

3. A hydraulic booster proportional valve according to claim 2, characterized in that: The elastic member is a spring, one end of which abuts against the support plate, and the other end of which abuts against the bottom of the valve core.

4. A hydraulic booster proportional valve according to claim 2 or 3, characterized in that: The support plate is a retaining spring, a mounting groove is provided in the valve sleeve, and the retaining spring is mounted in the mounting groove.

5. A hydraulic booster proportional valve according to claim 1, characterized in that: The valve body is provided with a pipeline communicating with the liquid inlet and the liquid discharge port on the valve sleeve to realize liquid supply and liquid discharge.

6. A hydraulic booster proportional valve according to claim 1, characterized in that: The diameters of the first inlet and the second inlet are half of the liquid inlet, and the diameters of the first outlet and the second outlet are half of the liquid discharge port.

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