Hydraulic pilot handle valve

Abstract

The utility model relates to the technical field of engineering machinery, in particular to a hydraulic pilot handle valve which comprises a valve body, an oil supply cavity, an oil return cavity, an oil supply port and an oil return port, the oil supply cavity and the oil return cavity are arranged in the valve body, the oil supply port is arranged on the bottom surface of the valve body and communicated with the oil supply cavity, and the oil return port is arranged on the bottom surface of the valve body and communicated with the oil return cavity. Each valve hole comprises a large-diameter part communicated with the oil return cavity and a small-diameter part communicated with the oil supply cavity from top to bottom, the hole bottom of each valve hole extends downwards to the bottom surface of the valve body to form a working oil port, and a valve element assembly for controlling the working oil port to be communicated with the oil supply cavity or the oil return cavity is arranged in each valve hole; according to the utility model, an integrated valve body structure is adopted, so that the assembly links and the use of sealing parts are reduced, and the manufacturing cost and the assembly complexity are reduced; a secondary pressure cavity which is independently arranged is omitted, and the bottom of the valve hole directly extends to form the working oil port, so that the width of the valve body is remarkably reduced, and the space occupancy rate is effectively reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to engineering machinery technical field especially relates to a hydraulic pilot handle valve. BACKGROUND

[0002] In the engineering machinery field, the pilot handle is widely used in various hydraulic machines, as the control element of the hydraulic system, controls various actions, such as crushing, bulldozing, land leveling, excavating etc. Therefore, the role of the pilot handle on the whole machine is particularly important, and its performance directly influences the controllability of the whole machine.

[0003] The existing hydraulic pilot handle valve mainly includes handle grip, valve body, end cover and several valve core assemblies, wherein the handle grip is installed at the top of the valve body, the end cover is installed at the bottom of the valve body, and the end cover is provided with oil supply port (P), oil return port (T) and several control oil ports connected with the hydraulic system, the valve body is correspondingly provided with oil supply cavity connected with the oil supply port, oil return cavity connected with the oil return port and several secondary pressure cavities connected with the control oil ports respectively, a plurality of valve holes are formed in the upper surface of the valve body and communicated with the cavities, the handle grip drives each valve core assembly to move up and down in the valve hole through the universal swing assembly, thereby controlling the on-off between the oil supply cavity, the oil return cavity and each secondary pressure cavity to realize the pressure reduction control of the pilot pressure.

[0004] However, the drawbacks of the above structure are that the end cover and the valve body are in a split structure, the structure is complex, and additional sealing components need to be installed during assembly, which increases the cost and is not conducive to quality control; the secondary pressure cavities are separately arranged outside the valve hole, resulting in that the overall width of the valve body is relatively large, the installation occupies more space, and is not conducive to the compact layout of the equipment. UTILITY MODEL CONTENTS

[0005] The utility model solves the technical problem in the prior art and provides a hydraulic pilot handle valve with simple structure, convenient assembly, reduced cost and small space occupation.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme: a hydraulic pilot handle valve, comprising a valve body, an oil supply cavity and an oil return cavity arranged in the valve body, an oil supply port arranged on the bottom surface of the valve body and communicated with the oil supply cavity, and an oil return port arranged on the bottom surface of the valve body and communicated with the oil return cavity, characterized in that:

[0007] The top surface of the valve body is provided with at least one valve hole, each valve hole comprises a large-diameter part communicated with the oil return cavity and a small-diameter part communicated with the oil supply cavity from top to bottom, and the hole bottom of the valve hole extends downward to the bottom surface of the valve body to form a working oil port, and each valve hole is provided with a valve core assembly for controlling the communication between the working oil port and the oil supply cavity or the oil return cavity.

[0008] The valve core assembly comprises a push rod coaxially arranged in the valve hole, a fixed seat arranged at the bottom of the push rod, a valve core axially slidingly arranged in the middle part of the fixed seat, a blind hole arranged at the bottom of the push rod for inserting the upper end of the valve core, a convex ring fixedly arranged at the lower part of the valve core, and a pressure regulating spring arranged between the fixed seat and the convex ring.

[0009] The valve core below the convex ring is arranged as a plugging section corresponding to the hole diameter of the small-diameter part, a first oil passing hole is arranged through the plugging section in the radial direction, and a second oil passing hole is arranged through the bottom surface of the valve core in the upward direction and communicated with the first oil passing hole.

[0010] The valve body top is provided with a universal swing assembly for driving the valve core assembly to axially move in the valve hole.

[0011] The transition step opposite to the fixed seat is arranged between the large-diameter part and the small-diameter part, and a reset spring abutting the fixed seat against the lower surface of the push rod is arranged between the transition step and the fixed seat.

[0012] The buffer gap is arranged between the outer wall of the fixed seat and the hole wall of the large-diameter part of the valve hole, the first through hole is axially arranged in the middle part of the fixed seat and slidingly matched with the upper end of the valve core, and the hole wall of the first through hole is radially spaced apart to arrange the second through hole communicated with the blind hole.

[0013] The push rod sleeve is coaxially arranged at the upper end of the valve hole, the push rod is slidably arranged at the inner circumferential side of the push rod sleeve, the mounting plate is arranged at the top of the valve body for axially compressing and fixing the push rod sleeve, and the push rod sleeve mounting hole is arranged on the mounting plate and corresponding to the upper end of the push rod sleeve.

[0014] The universal swing assembly comprises the universal joint fixedly arranged at the top of the valve body, the operating rod rotatably arranged on the universal joint, and the swing seat fixedly arranged at the lower part of the operating rod, and the lower surface of the swing seat is arranged as the pressure applying surface matched with the upper end of each push rod.

[0015] The mounting plate is fixedly arranged at the top of the valve body through the universal joint, the fixed plate is arranged at the top of the mounting plate, the fixed plate is fixedly arranged on the valve body through the fastener, the handle grip is fixedly arranged at the top of the operating rod, and the dust cover is arranged on the outer periphery of the operating rod between the lower surface of the handle grip and the fixed plate.

[0016] The technical problems to be solved by the utility model can be further realized through the following steps, the oil supply cavity and the oil return cavity are both horizontally arranged, and the oil supply cavity is arranged at the lower part of the oil return cavity, the side part of the valve body is provided with at least two auxiliary oil ports communicated with the oil supply cavity or the oil return cavity, and a sealing plug is detachably arranged at each auxiliary oil port.

[0017] The technical problems to be solved by the utility model can be further realized through the following steps, the oil supply cavity and the oil return cavity are both horizontally arranged, and the oil supply cavity is arranged at the lower part of the oil return cavity, the side part of the valve body is provided with at least two auxiliary oil ports communicated with the oil supply cavity or the oil return cavity, and a sealing plug is detachably arranged at each auxiliary oil port.

[0018] Compared with the prior art, the utility model has the advantages that: the integrated valve body structure is adopted, the traditional split type end cover design is cancelled, the assembly links and the use of sealing components are reduced, the manufacturing cost and the assembly complexity are reduced, the single secondary pressure cavity is cancelled, the valve hole bottom is directly extended to form the working oil port, the first oil passing hole and the second oil passing hole are arranged on the valve core plugging section, the efficient on-off control between the working oil port and the oil supply cavity and the oil return cavity is ensured, the valve body width is obviously reduced, the space occupancy is reduced, and the utility model is especially suitable for the engineering machinery application scene with limited space. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the whole structure schematic view of the utility model;

[0020] Figure 2 It is the upper view schematic view of the utility model;

[0021] Figure 3 It is the downward view schematic view of the utility model (omitting dust cover, operating rod and handle handle);

[0022] Figure 4 It is Figure 2 A direction sectional view of the utility model;

[0023] Figure 5 It is Figure 3 B direction sectional view of the utility model;

[0024] Figure 6 It is Figure 2 C direction sectional view of the utility model (omitting valve core assembly);

[0025] Figure 7 It is Figure 2 D direction sectional view of the utility model (omitting valve core assembly);

[0026] Figure 8 It is the structure schematic view of the valve body of the utility model;

[0027] Figure 9 It is the structural schematic view of the utility model mounting plate;

[0028] Figure 10 It is the structural schematic view of the utility model fixed seat;

[0029] In the figure: 1-valve body;2-oil supply cavity;3-oil return cavity;4-oil supply port;5-oil return port;6-valve hole;7-large diameter part;8-small diameter part;9-working oil port;10-push rod;11-fixed seat;12-valve core;13-blind hole;14-convex ring;15-pressure regulating spring;17-first oil passing hole;18-second oil passing hole;19-return spring;20-first through hole;21-second through hole;22-push rod sleeve;23-universal joint;24-operation lever;25-oscillating seat;26-fixed plate;27-handle handle;28-dust cover;29-sealing plug;30-sealing cover;31-mounting plate;32-bolt hole;33-threading hole. DETAILED DESCRIPTION

[0030] The specific technical scheme of the utility model is further described below, so that those skilled in the art can further understand the utility model, and it does not constitute a limitation on its rights.

[0031] In the description of the utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model.

[0032] Please refer to Figures 1-10 A hydraulic pilot handle valve, comprising a valve body 1, an oil supply cavity 2 and an oil return cavity 3 arranged inside the valve body 1, an oil supply port 4 arranged on the bottom surface of the valve body 1 and communicating with the oil supply cavity 2, and an oil return port 5 arranged on the bottom surface of the valve body 1 and communicating with the oil return cavity 3;The valve body 1 adopts an integral drawing profile blank, which is machined;

[0033] At least one valve hole 6 is formed on the top surface of the valve body 1 downward, each valve hole 6 comprises a large diameter part 7 communicating with the oil return cavity 3 and a small diameter part 8 communicating with the oil supply cavity 2 from top to bottom, and the hole bottom of the valve hole 6 extends downward to the bottom surface of the valve body 1 to form a working oil port 9, and a valve core assembly for controlling the communication between the working oil port 9 and the oil supply cavity 2 or the oil return cavity 3 is arranged in each valve hole 6;

[0034] The valve core assembly comprises a push rod 10 coaxially arranged in the valve hole 6, a fixed seat 11 arranged at the bottom of the push rod 10, a valve core 12 axially slidingly arranged in the middle part of the fixed seat 11, a blind hole 13 arranged at the bottom of the push rod 10 for inserting the upper end of the valve core 12, a convex ring 14 fixedly arranged at the lower part of the valve core 12, and a pressure regulating spring 15 arranged between the fixed seat 11 and the convex ring 14.

[0035] The valve core 12 below the convex ring 14 is arranged as a blocking section corresponding to the hole diameter of the small-diameter part 8, and a first oil passing hole 17 is arranged through the blocking section in the radial direction; the bottom surface of the valve core 12 is upwardly provided with a second oil passing hole 18 in communication with the first oil passing hole 17.

[0036] The valve body 1 is provided at the top with a universal swing assembly for driving the valve core assembly to axially move in the valve hole 6.

[0037] When the push rod 10 is in the initial position, the first oil passing hole 17 of the valve core 12 is located above the oil supply cavity 2, and the oil in the oil supply cavity 2 is blocked by the outer peripheral surface of the blocking section; at this time, the working oil port 9 is in communication with the oil return cavity 3; when the universal swing assembly drives the valve core 12 to move downward until the first oil passing hole 17 is in height coincidence with the oil supply cavity 2, at this time, the working oil port 9 is in communication with the oil supply cavity 2, and the oil flows from the first oil passing hole 17 and the second oil passing hole 18 to the bottom end of the valve core 12, thereby forming a hydraulic counterforce at the bottom; when the bottom counterforce continuously increases and pushes the valve core 12 to move upward, the originally opened oil supply cavity 2 tends to be closed, the opening is reduced, and the pressure is reduced. When the bottom counterforce and the elastic force of the pressure regulating spring 15 are balanced, the valve core 12 reaches the equilibrium state, and the secondary pressure realizes stable output.

[0038] In order to realize automatic reset of the push rod 10, a transition step opposite to the fixed seat 11 is arranged between the large-diameter part 7 and the small-diameter part 8, and a reset spring 19 abutting the fixed seat 11 against the lower surface of the push rod 10 is arranged between the transition step and the fixed seat 11.

[0039] In order to reduce the impact of oil and improve the control performance, a buffer gap is arranged between the outer wall of the fixed seat 11 and the hole wall of the large-diameter part 7 of the valve hole 6, and a first through hole 20 axially arranged in the middle part of the fixed seat 11 is in sliding cooperation with the upper end of the valve core 12; the hole wall of the first through hole 20 is radially spaced apart to form a second through hole 21 in communication with the blind hole 13.

[0040] The push rod 10 is installed in the groove of the fixed seat 11, and the two are tightly matched to form an integral body during operation. The fixed seat 11 corresponds to a piston in the valve hole 6 and can form a closed cavity with the push rod sleeve 22. When the fixed seat 11 moves up and down, the volume of the closed cavity changes, and the hydraulic oil inside the closed cavity will overflow / absorb from the buffer gap. By replacing the fixed seat 11 of different specifications to change the size of the buffer gap, the buffer damping effect can be adjusted. In addition, an oil passage (such as a flat notch, a circular arc groove, etc.) can be provided on the outer circle of the fixed seat 11 to further adjust the buffer damping.

[0041] As a structure for positioning the push rod 10, the push rod sleeve 22 is coaxially installed at the upper end of the valve hole 6, the push rod 10 is slidably arranged on the inner circumferential side of the push rod sleeve 22, and the valve body 1 is provided with a mounting plate 31 for axially pressing and fixing the push rod sleeve 22. The mounting plate 31 is provided with a push rod sleeve mounting hole corresponding to the upper end of the push rod sleeve 22.

[0042] The universal swing assembly includes a universal joint 23 fixedly installed on the top of the valve body 1, an operating rod 24 rotatably installed on the universal joint 23, and a swing seat 25 fixedly installed on the lower part of the operating rod 24. The lower surface of the swing seat 25 is provided as a pressing surface matched with the round head at the upper end of each push rod 10. The pressing surface is specifically provided as a tapered surface facilitating cooperation with the round head.

[0043] The mounting plate 31 is cut or stamped from a steel plate and is fixed on the valve body 1 through the universal joint 23. The mounting plate 31 is provided with four push rod sleeve mounting holes, a plurality of bolt holes 32, and a wire hole 33. The mounting plate 31 covers the boss at the upper part of the push rod sleeve 22 and presses and fixes it in the valve hole 6. The bolt holes 32 at the outer edge of the mounting plate 31 are used for fixing the product on the main machine, and the wire hole 33 is used for fixing and connecting the wire harness of the multifunctional handle 27.

[0044] The mounting plate 31 is fixedly installed on the top of the valve body 1 through the universal joint 23. The top of the mounting plate 31 is provided with a fixed plate 26 fixedly installed on the valve body 1 through a fastener. A handle 27 is fixedly sleeved on the top of the operating rod 24. A dust cover 28 covering the outer periphery of the operating rod 24 is arranged between the lower surface of the handle 27 and the fixed plate 26. The fixed plate 26 is made of nylon or plastic material, which not only reduces the weight but also fits the dust cover 28 made of rubber material better.

[0045] To optimize the internal structure of the valve body 1, the oil supply chamber 2 and the oil return chamber 3 are horizontally arranged, and the oil supply chamber 2 is arranged at the lower part of the oil return chamber 3, and at least two auxiliary oil ports communicating with the oil supply chamber 2 or the oil return chamber 3 are arranged at the side of the valve body 1, and a sealing plug 29 is detachably arranged at each auxiliary oil port, and the auxiliary oil ports are used for communicating with external oil lines or installing pressure detection devices.

[0046] To further optimize the layout, four working oil ports 9 are arranged, and the center points of the four working oil ports 9 are located on the same plane, and the connecting line of the center points forms a rectangle, and the oil supply port 4 and the oil return port 5 are symmetrically arranged on the outside of a pair of parallel sides of the rectangle, and the oil supply port 4, the oil return port 5 and each working oil port 9 are threadedly connected with a sealing cover 30.

[0047] Working principle: the hydraulic pilot handle valve of the utility model, when in use, the operator applies force through the handle 27, drives the operating rod 24 and the swing base 25 to swing. The pressing surface of the swing base 25 is in contact with the round head at the upper end of the push rod 10, and the push rod 10 is axially moved in the push rod sleeve 22. The movement of the push rod 10 drives the fixed base 11 and the valve core 12 to slide up and down in the valve hole 6, thereby controlling the on-off between the working oil port 9 and the oil supply chamber 2 or the oil return chamber 3.

[0048] When the push rod 10 is at the initial position, the plugging section of the valve core 12 disconnects the oil supply chamber 2 from the working oil port 9, and the working oil port 9 is communicated with the oil return chamber 3, at this time, the hydraulic oil flows back to the oil tank from the oil return chamber 3, and the system is in the unloading state. When the operator pushes the handle 27, the push rod 10 moves downward, and the valve core 12 moves downward, until the first oil passing hole 17 is aligned with the oil supply chamber 2, and the hydraulic oil in the oil supply chamber 2 flows into the working oil port 9 through the first oil passing hole 17 and the second oil passing hole 18, forming a pilot pressure, and driving the execution element to work.

[0049] During the downward movement of the valve core 12, the pressure spring 15 is compressed, and an upward elastic force is generated. When the pressure of the hydraulic oil and the elastic force of the pressure spring 15 reach balance, the valve core 12 stops moving downward, and the system enters a stable working state. At this time, the pressure of the working oil port 9 is proportional to the pre-tightening force of the pressure spring 15, and the pilot pressure is accurately controlled.

[0050] When the operator releases the handle 27, the reset spring 19 pushes the fixed base 11 and the push rod 10 back to the initial position, the valve core 12 moves upward, and the plugging section disconnects the oil supply chamber 2 from the working oil port 9, and the working oil port 9 is communicated with the oil return chamber 3, and the system returns to the unloading state.

[0051] The utility model discloses a valve body 1 structure is adopted integrative, cancels traditional split type end cover design, reduced assembly link and the use of sealing component, reduced manufacturing cost and assembly complexity, through canceling the secondary pressure chamber of setting up alone, the bottom of valve hole 6 is directly extended and forms the working oil port 9, and the first oil passing hole 17 and the second oil passing hole 18 are set up on the plugging section of valve core 12, ensure the efficient on-off control between working oil port 9 and oil supply chamber 2, oil return chamber 3, significantly reduce the width of valve body 1, reduce the space occupancy, especially suitable for the engineering machinery application scene of space limited.

[0052] Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

Claims

1. A hydraulic pilot handle valve, comprising a valve body, an oil supply chamber and an oil return chamber arranged inside the valve body, an oil supply port arranged on the bottom surface of the valve body and communicating with the oil supply chamber, and an oil return port arranged on the bottom surface of the valve body and communicating with the oil return chamber, characterized in that: at least one valve hole is formed in the top surface of the valve body and downwardly extending to the bottom surface of the valve body, each valve hole comprises a large-diameter portion communicating with the oil return chamber and a small-diameter portion communicating with the oil supply chamber from top to bottom, and the bottom of the valve hole forms a working oil port, and a valve core assembly controlling the communication between the working oil port and the oil supply chamber or the oil return chamber is arranged in each valve hole; the valve core assembly comprises a push rod coaxially arranged in the valve hole, a fixed seat arranged at the bottom of the push rod, a valve core axially slidingly arranged in the middle part of the fixed seat, a blind hole formed in the bottom of the push rod for the upper end of the valve core to be inserted, a convex ring fixedly installed at the lower part of the valve core, and a pressure regulating spring arranged between the fixed seat and the convex ring; the valve core below the convex ring is arranged as a plugging section corresponding to the hole diameter of the small-diameter portion, a first oil passing hole is formed in the plugging section along the radial direction, and a second oil passing hole is formed in the bottom surface of the valve core and communicating with the first oil passing hole; a universal swing assembly is installed on the top of the valve body to drive the valve core assembly to axially move in the valve hole. a transition step opposite to the fixed seat is arranged between the large-diameter portion and the small-diameter portion, and a return spring abutting the fixed seat against the lower surface of the push rod is arranged between the transition step and the fixed seat. a buffer gap is arranged between the outer wall of the fixed seat and the hole wall of the large-diameter portion of the valve hole, a first through hole axially formed in the middle part of the fixed seat is slidingly matched with the upper end of the valve core, and a second through hole communicating with the blind hole is radially spaced apart from the hole wall of the first through hole. a push rod sleeve is coaxially installed on the upper end of the valve hole, the push rod is slidably arranged on the inner circumferential side of the push rod sleeve, and an installation plate axially pressing and fixing the push rod sleeve is arranged on the top of the valve body, a push rod sleeve installation hole corresponding to the upper end of the push rod sleeve is arranged on the installation plate. the universal swing assembly comprises a universal joint fixedly installed on the top of the valve body, an operating rod rotatably installed on the universal joint, and a swing seat fixedly installed on the lower part of the operating rod, and the lower surface of the swing seat is arranged as a pressure applying surface matched with the upper end of each push rod.

2. The hydraulic pilot handle valve of claim 1, wherein: the installation plate is fixedly installed on the top of the valve body through the universal joint, a fixed plate is arranged on the top of the installation plate, the fixed plate is fixedly installed on the valve body through fasteners, a handle grip is fixedly sleeved on the top of the operating rod, and a dust cover covering the outer periphery of the operating rod is arranged between the lower surface of the handle grip and the fixed plate.

3. The hydraulic pilot handle valve of claim 1, wherein: the oil supply chamber and the oil return chamber are both horizontally arranged, and the oil supply chamber is arranged below the oil return chamber, at least two auxiliary oil ports communicating with the oil supply chamber or the oil return chamber are arranged on the side of the valve body, and a seal plug is detachably installed at each auxiliary oil port.

4. The hydraulic pilot handle valve of claim 1, wherein: four working oil ports are arranged, the center points of the four working oil ports are located on the same plane, and the connecting line thereof forms a rectangle, the oil supply port and the oil return port are symmetrically arranged on the outside of a pair of parallel sides of the rectangle, and a seal cover is threadedly connected with the oil supply port, the oil return port, and each working oil port.

5. The hydraulic pilot handle valve of claim 4, wherein: ​ 6. The hydraulic pilot handle valve of claim 5, wherein: ​ 7. The hydraulic pilot handle valve of claim 1, wherein: ​ 8. The hydraulic pilot handle valve of claim 1, wherein: ​

Images