CN210013877U - Load holding valve and hydraulic system - Google Patents
Load holding valve and hydraulic system Download PDFInfo
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- CN210013877U CN210013877U CN201920247261.1U CN201920247261U CN210013877U CN 210013877 U CN210013877 U CN 210013877U CN 201920247261 U CN201920247261 U CN 201920247261U CN 210013877 U CN210013877 U CN 210013877U
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Abstract
The utility model discloses a load holding valve and a hydraulic system, wherein the load holding valve comprises a valve block; a first control chamber and a second control chamber are arranged in the valve block; the valve core of the holding valve, the spring of the holding valve and the plug are arranged in the first control chamber to form a main oil path; the limiting joint, the pilot push rod, the control oil way valve core, the control valve spring, the secondary control valve seat, the secondary control valve core, the limiting device, the secondary control valve spring and the spring seat are arranged in the second control chamber to form a secondary control oil way; and the secondary control oil way is used for controlling the reverse opening of the main oil way. The hydraulic control one-way valve and the one-way valve are connected in series, secondary control of the control oil way of the holding valve is achieved, and the load holding stability and the load holding function of the load holding valve are improved.
Description
Technical Field
The utility model belongs to the technical field of engineering machine tool, in particular to load keeps valve and hydraulic system.
Background
The application environment of the engineering machinery is severe, the working condition is complex, and the uncontrollable factors are more; the stability of the system, especially in a loaded state, is critical to the safety performance of the host computer. The hydraulic excavator system has strict requirements on the on-load settlement amount and the stability of a movable arm and a bucket rod, and load maintaining valves are arranged in a movable arm large cavity and a bucket rod small cavity particularly for ensuring the on-load settlement amount and the stability of the movable arm and the bucket rod, so that the settlement amount and the stability of the movable arm large cavity and the bucket rod small cavity under the working conditions of heavy load and light load are ensured.
The prior art has the following defects: the boom falling phenomenon is generated due to internal leakage of a movable boom and a bucket rod of the existing hydraulic excavator.
SUMMERY OF THE UTILITY MODEL
The purpose is as follows: in order to overcome the deficiencies in the prior art, the utility model provides a load keeps valve and hydraulic system. Aiming at the occasions with strict requirements on the settling volumes of the movable arm and the bucket rod in the hydraulic system of the engineering mechanical excavator, the settling volumes of the movable arm and the bucket rod are reduced, and the safety of a working device is improved; the phenomenon that the movable arm and the bucket rod of the existing hydraulic excavator fall due to internal leakage is eliminated.
The technical scheme is as follows: in order to solve the technical problem, the utility model discloses a technical scheme does:
a load holding valve comprising a valve block; a first control chamber and a second control chamber are arranged in the valve block;
the first control chamber sequentially comprises a cavity B communicated with the port P, a cavity C communicated with the port A and a cavity G from bottom to top; the cavity B, the cavity C and the cavity G are coaxial, and the inner diameter of the cavity C is larger than that of the cavity B;
a holding valve spool is movably accommodated in the first control chamber;
the circumferential direction of the large head end of the valve core of the holding valve is movably sealed with the inner wall of the containing cavity G;
when the valve core of the holding valve is in a closed state, the small end of the valve core of the holding valve is sealed with the inner wall of the cavity B in the circumferential direction, and the communication between the cavity B and the cavity C is blocked;
when the valve core of the holding valve moves upwards, the valve core of the holding valve is opened, and the cavity B is communicated with the cavity C;
the cavity G is communicated with the cavity C through a throttling hole on a valve core of the maintaining valve;
the top end of the valve core of the holding valve limits the boundary of the first control chamber through a holding valve spring and a plug; the plug is fixedly connected with the valve block;
the second control chamber sequentially comprises a cavity E, a cavity M and a cavity N from top to bottom, and is sequentially provided with a limit joint, a pilot push rod, a control oil way valve core, a control valve spring, a secondary control valve seat, a secondary control valve core, a limit device, a secondary control valve spring and a spring seat from top to bottom;
the limiting joint and the spring seat are respectively and fixedly connected and arranged at the uppermost end and the lowermost end of the second control chamber; the limiting joint limits the upper end of the pilot push rod, a pilot oil port is formed in the upper end of the pilot push rod, and the K port is communicated with a pilot control oil way;
the pilot push rod is provided with a pilot pressure acting end with a larger diameter and a valve rod with a smaller diameter for pushing a valve core of the control oil path;
the lower end of the pilot push rod is in close contact with the upper end of the control oil way valve core and is used for pushing the control oil way valve core to move downwards and communicating the containing cavity D with the containing cavity E, and the containing cavity D is communicated with the containing cavity G of the first control chamber;
the cavity E is an area between the pilot push rod and the upper end of the control oil way valve core;
the cavity M is an area between the lower end of the valve core of the control oil way and the valve seat of the secondary control valve;
the cavity N is an area between the lower end of a valve seat of the secondary control valve and a valve core and a spring seat of the secondary control valve; the cavity N is communicated with the cavity B;
a throttle hole is formed in the valve core of the control oil way and is communicated with the cavity E and the cavity M;
the lower end of the valve core of the secondary control valve is movably arranged on the spring seat, and the upper end of the valve core of the secondary control valve can be matched and sealed with the central channel of the valve seat of the secondary control valve;
and a secondary control valve spring is coaxially sleeved outside the secondary control valve spool, the upper end of the secondary control valve spring compresses the secondary control valve spool, and the lower end of the secondary control valve spring is connected and arranged on the spring seat.
Furthermore, the load maintaining valve further comprises a limiting device, wherein the limiting device is fixedly arranged on the inner wall of the second control chamber and is used for limiting the lowest position of the moving position of the valve seat of the secondary control valve.
The utility model discloses in, the P mouth of load holding valve leads to the directional valve, and actuating mechanism is led to A mouth, and the K mouth leads to the pilot control oil circuit.
Preferably, the valve core of the holding valve is a cylindrical one-way cone valve, one end of the valve core is of a conical surface structure, the other end of the valve core is provided with a spring cavity, and a throttling hole communicated with the spring cavity is formed in the position of a holding oil port behind the conical surface of the valve core of the holding valve.
Preferably, one end of the control oil way valve core is of a spherical structure, the other end of the control oil way valve core is of a cylindrical structure with a central cavity, and the spherical end is provided with a throttling hole communicated with the central cavity.
Preferably, the valve seat of the secondary control valve comprises a cylinder with a smaller diameter and a cylinder with a larger diameter which are coaxially connected; a central circulation cavity which is communicated up and down is arranged; wherein the cylinder with larger diameter is movably connected with the inner wall of the second control chamber in a sealing way in the circumferential direction; the central circulation cavity is communicated with the central cavity of the valve core of the control oil way.
The control valve spring is sleeved outside the smaller-diameter cylinder at the upper end of the secondary control valve seat, the lower end of the control valve spring is pressed on the secondary control valve seat, and the upper end of the control valve spring is pressed on the bottom end face of the valve core of the control oil way.
Furthermore, a first sealing ring is arranged between the cylinder with the larger diameter of the valve seat of the secondary control valve and the inner wall of the second control chamber.
The pilot push rod is movably connected with the inner wall of the second control chamber in a sealing way in the circumferential direction of a pilot pressure acting end with a larger diameter;
furthermore, a second sealing ring is arranged between the circumferential direction of the pilot pressure acting end with the larger diameter of the pilot push rod and the inner wall of the second control chamber.
As a preferred scheme, the valve core of the secondary control valve is a cylindrical one-way cone valve with a T-shaped section; one end of the spherical sealing structure is of a cylindrical structure, and the other end of the spherical sealing structure is of a spherical sealing structure; the cylindrical end is movably arranged in a guide hole of the spring seat, and the spherical sealing end is matched with the lower end of the valve seat of the secondary control valve to seal the lower end of the central circulation cavity.
The load holding valve comprises a main oil path and a secondary control oil path;
the valve core of the holding valve, the spring of the holding valve and the plug are arranged in the first control chamber to form a main oil path;
the limiting joint, the pilot push rod, the control oil way valve core, the control valve spring, the secondary control valve seat, the secondary control valve core, the limiting device, the secondary control valve spring and the spring seat are arranged in the second control chamber to form a secondary control oil way;
and the secondary control oil way is used for controlling the reverse opening of the main oil way.
In another aspect, the present invention further provides a hydraulic system including the above load holding valve.
Has the advantages that: the utility model provides a load holding valve and a hydraulic system, which can eliminate the arm falling phenomenon caused by internal leakage of a movable arm and a bucket rod of the existing hydraulic excavator; on the basis of fully absorbing the structural form and the opening principle of the pilot overflow valve, the load holding valve device provides a serial structural form of a hydraulic control one-way valve and a one-way valve, so that the performance of the load holding valve is improved, and the reliable sealing effect is realized by utilizing the self characteristic of oil and the spherical sealing form; the utility model adopts the form of combining the self-control oil circuit and the external control oil circuit, the self-control oil circuit structure ensures the stability and the reliability of the load holding valve holding function, and the external control oil circuit realizes the reverse opening function of the load holding valve; meanwhile, the utility model realizes the closed loop structure form of the control oil circuit, thereby not only improving the system efficiency, but also reducing the energy loss; the utility model discloses a not only superior performance and simple structure easily process the realization. Has the following advantages:
(1) the utility model adopts a two-stage control structure, which is beneficial to improving the stability and safety of the load maintaining function and improving the impact resistance of the load;
(2) the load holding function of the load holding valve is improved, and internal leakage is reduced;
(3) the control oil way and the main oil way form a closed-loop control structure, so that a multi-stage closed cavity can be effectively formed, the control performance of the secondary control valve is improved, and the sealing performance of the load maintaining valve is enhanced;
(4) the secondary control valve adopts a spherical sealing structure, and the spherical sealing self-centering and the sealing surface can form a reliable sealing structure;
(5) the secondary control valve has simple structure, is convenient to process and assemble and is easy to realize.
Drawings
FIG. 1 is a schematic view of an embodiment of a load holding valve configuration;
FIG. 2 is a sectional view of an auxiliary oil passage of the load holding valve;
FIG. 3 is a schematic view of a load holding valve;
in the figure: the valve comprises a valve block 1, a holding valve core 2, a plug 3, a holding valve spring 4, a limiting joint 5, a process plug 6, a control oil way valve core 7, a spring seat 8, a secondary control valve seat 9, a secondary control valve core 10, a limiting device 11, a control valve spring 12, a secondary control valve spring 13, a pilot push rod 14, a first sealing ring 15 and a second sealing ring 16.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Unless specifically stated otherwise, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may also include different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Example 1
As shown in fig. 1, 2, a load holding valve includes a valve block 1; a first control chamber and a second control chamber are arranged in the valve block 1;
the first control chamber sequentially comprises a cavity B communicated with the port P, a cavity C communicated with the port A and a cavity G from bottom to top; the cavity B, the cavity C and the cavity G are coaxial, and the inner diameter of the cavity C is larger than that of the cavity B;
a holding valve spool 2 is movably accommodated in the first control chamber;
the circumferential direction of the large end of the valve core 2 of the holding valve is movably sealed with the inner wall of the containing cavity G;
when the valve core 2 of the holding valve is in a closed state, the circumferential direction of the small end of the valve core 2 of the holding valve is sealed with the inner wall of the cavity B, and the communication between the cavity B and the cavity C is blocked;
when the valve core 2 of the holding valve moves upwards, the valve core 2 of the holding valve is opened, and the cavity B is communicated with the cavity C;
the cavity G is communicated with the cavity C through a throttling hole on the valve core 2 of the maintaining valve;
the top end of the valve core 2 of the holding valve limits the boundary of a first control chamber through a holding valve spring 4 and a plug 3; the plug 3 is fixedly connected with the valve block 1;
the second control chamber is sequentially provided with a limiting joint 5, a pilot push rod 14, a control oil way valve core 7, a control valve spring 12, a secondary control valve seat 9, a secondary control valve core 10, a limiting device 11, a secondary control valve spring 13 and a spring seat 8 from top to bottom; comprises a cavity E, a cavity M and a cavity N from top to bottom in sequence,
the limiting joint 5 and the spring seat 8 are respectively and fixedly connected and arranged at the uppermost end and the lowermost end of the second control chamber; the limiting joint 5 limits the upper end of the pilot push rod 14, a pilot oil port is formed in the upper end of the pilot push rod 14, and a K port is communicated with a pilot control oil way;
the pilot push rod 14 is provided with a pilot pressure acting end with a larger diameter and a valve rod with a smaller diameter for pushing the valve core 7 of the control oil path;
the lower end of the pilot push rod 14 is in close contact with the upper end of the control oil way valve core 7 and is used for pushing the control oil way valve core 7 to move downwards and communicating the containing cavity D with the containing cavity E, and the containing cavity D is communicated with the containing cavity G of the first control chamber;
the cavity E is an area between the pilot push rod 14 and the upper end of the control oil way valve core 7;
the cavity M is an area between the lower end of the control oil way valve core 7 and the valve seat 9 of the secondary control valve;
the cavity N is the area between the lower end of the valve seat 9 of the secondary control valve, the valve core 10 of the secondary control valve and the spring seat 8; the cavity N is communicated with the cavity B;
a throttle hole is formed in the control oil way valve core 7 and is communicated with the cavity E and the cavity M;
the lower end of the valve core 10 of the secondary control valve is movably arranged on the spring seat 8, the upper end of the valve core 10 of the secondary control valve and the central channel of the valve seat 9 of the secondary control valve can be matched and sealed,
a secondary control valve spring 13 is coaxially sleeved outside the secondary control valve core 10, the upper end of the secondary control valve spring 13 compresses the secondary control valve core 10, and the lower end of the secondary control valve spring 13 is connected and arranged on the spring seat 8.
The device further comprises a limiting device 11, wherein the limiting device 11 is fixedly installed on the inner wall of the second control chamber and used for limiting the lowest position of the moving position of the valve seat 9 of the secondary control valve.
The valve core 2 of the holding valve is a cylindrical one-way cone valve, one end of the valve core is of a conical surface structure, the other end of the valve core is provided with a spring cavity, and a throttling hole communicated with the spring cavity is formed in the position of a holding oil port behind the conical surface of the valve core 2 of the holding valve.
Furthermore, one end of the control oil way valve core 7 is of a spherical structure, the other end of the control oil way valve core is of a cylindrical structure with a central cavity, and the spherical end is provided with a throttling hole communicated with the central cavity.
In some embodiments, as shown in fig. 1 and 2, the secondary control valve seat 9 comprises a smaller diameter cylinder and a larger diameter cylinder which are coaxially connected; a central circulation cavity which is communicated up and down is arranged; wherein the cylinder with larger diameter is movably connected with the inner wall of the second control chamber in a sealing way in the circumferential direction; the central circulation cavity is communicated with the central cavity and the containing cavity M of the control oil way valve core 7.
The control valve spring 12 is sleeved outside the smaller-diameter cylinder at the upper end of the secondary control valve seat 9, the lower end of the control valve spring 12 is pressed on the secondary control valve seat 9, and the upper end of the control valve spring is pressed on the bottom end face of the control oil way valve core 7.
Further, a first sealing ring 15 is arranged between the cylinder with the larger diameter of the valve seat 9 of the secondary control valve and the inner wall of the second control chamber.
In some embodiments, as shown in fig. 1 and 2, the pilot push rod 14 has a movable sealing connection between the circumferential direction of the pilot pressure acting end with a larger diameter and the inner wall of the second control chamber;
further, a second sealing ring 16 is arranged between the circumferential direction of the pilot pressure acting end with the larger diameter of the pilot push rod 14 and the inner wall of the second control chamber.
In some embodiments, as shown in fig. 1 and 2, the valve core 10 of the secondary control valve is a cylindrical one-way cone valve with a T-shaped cross section; one end of the spherical sealing structure is of a cylindrical structure, and the other end of the spherical sealing structure is of a spherical sealing structure; the cylindrical end is movably arranged in a guide hole of the spring seat 8, and the spherical sealing end is matched with the lower end of a valve seat 9 of the secondary control valve to seal the lower end of the central circulation cavity.
In some embodiments, as shown in fig. 1, 2, a load holding valve includes a main oil passage and a secondary control oil passage; the valve comprises a valve block 1, a holding valve core 2, a plug 3, a holding valve spring 4, a limiting joint 5, a process plug 6, a control oil way valve core 7, a spring seat 8, a secondary control valve seat 9, a secondary control valve core 10, a limiting device 11, a control valve spring 12, a secondary control valve spring 13 and a pilot push rod 14;
the valve core 2 of the holding valve, the spring 4 of the holding valve and the plug 3 are arranged in a first control chamber to form a main oil path;
the limit joint 5, the pilot push rod 14, the control oil way valve core 7, the control valve spring 12, the secondary control valve seat 9, the secondary control valve core 10, the limit device 11, the secondary control valve spring 13 and the spring seat 8 are arranged in a second control chamber to form a secondary control oil way;
the secondary control oil way controls the reverse opening of the main oil way; the middle position of the directional valve for supplying oil to the load maintaining valve is an O-shaped function; the detailed structure is shown in fig. 1 and fig. 2, and the principle is shown in fig. 3.
As shown in fig. 3, a hydraulic system includes the load holding valve described above.
The utility model discloses an implement the principle:
(1) supplying oil to a working device:
the port P is communicated with a directional valve, the port A is communicated with an actuating mechanism, and the port K is communicated with a pilot control oil way; when oil enters the port P, the valve core 2 of the holding valve moves upwards under the action of the oil pressure of the port P, the oil in the cavity D, G moves upwards along with the valve core 2 of the holding valve, the pressure is increased, when the pressure of the cavity D, G is greater than the pressure of the port A, the oil in the cavity D, G is led to the port A through the throttling hole in the valve core 2 of the holding valve, the pressure of the cavity D, G is reduced, the valve core 2 of the holding valve is completely opened, at the moment, the cavity B is communicated with the cavity A, and the port P supplies oil to the working device.
(2) Oil return of the working device:
description of the drawings: the port A is connected with a movable arm large cavity or a bucket rod small cavity, oil is fed into the movable arm small cavity or the bucket rod large cavity, oil is returned from the movable arm large cavity or the bucket rod small cavity, and at the moment, the pressure of the movable arm large cavity and the bucket rod small cavity is greater than the pressure of the movable arm small cavity and the bucket rod large cavity under the action of external load;
when oil returns from the port A, the pressure of the port A is larger than that of the port P, the port P is communicated with the port T through the reversing valve, pilot oil is communicated with the port K at the moment, the pilot oil pushes the pilot push rod 14 to move downwards, the pilot push rod 14 pushes the control oil way valve core 7 to move, the pressure of the port A enters the containing cavity D, G through the throttling hole in the valve core 2 of the maintaining valve, after the pilot push rod 14 pushes the control oil way valve core 7 to move, the containing cavity D, E is communicated, oil in the containing cavity E is communicated with the containing cavity M through the throttling hole in the bottom of the control oil way valve core 7, the containing cavity N is communicated with the containing cavity B, the containing cavity B, N is a low-pressure cavity relative to the containing cavity M; the valve core 2 of the holding valve is opened under the action of load force, the containing cavity B is communicated with the containing cavity A, the holding valve is reversely opened, and oil at the opening A of the working device flows to the oil return tank at the opening T through the containing cavity B and the directional valve.
(3) The load holding valve holds a load:
when the load holding valve performs a load holding function, the cavity B, N communicates through an internal oil passage, and the cavity B, N forms a closed cavity; the valve core 10 of the secondary control valve cannot be opened, so that the cavity M forms a closed cavity, the valve core 7 of the control oil path cannot be opened, and the pressure of the oil in the cavity D, G is kept to be influenced by the valve core 7 of the control oil path; through the analysis of the load oil circuit and the control oil circuit, the load oil circuit and the control oil circuit form a closed loop, and reliable performance guarantee is formed for the valve core 2 of the holding valve.
Oil in the cavity of the load port A is communicated with the cavity C, and pressure oil in the cavity C flows to the cavity G, D through a throttling hole in the valve core 2 of the holding valve; under the static balance state, the pressure of oil in the cavity D, G is equal to the pressure of oil in the cavity C, but the area of the oil in the cavity G acting on the valve core 2 of the holding valve is larger than the area of the oil in the cavity C acting on the valve core 2 of the holding valve, and the valve core 2 of the holding valve is firmly combined with the conical surface of the valve block 1 under the action of the area differential pressure and the action of the spring 4 of the holding valve to form stable and reliable seal, so that the oil in the load port A is prevented from leaking, and the stability of the load is effectively ensured.
The utility model adopts the structure form that the hydraulic control one-way valve is connected with the one-way valve in series, thereby realizing the second-stage control of the control oil way and effectively improving the control effect of the load holding valve; meanwhile, the secondary control oil way adopts a spherical sealing structure form, and the spherical sealing structure has a self-centering function, so that the sealing effect is improved, the internal leakage amount is obviously reduced, and the stability of the system is ensured; the secondary control oil way realizes a closed-loop control structure, oil in a control cavity of a movable arm large cavity and a bucket rod small cavity is kept to a main reversing valve through the oil way, so that the energy regeneration function of the movable arm large cavity and the bucket rod small cavity is improved, namely, the oil in the movable arm large cavity and the bucket rod small cavity is improved to the movable arm small cavity and the bucket rod large cavity, the oil in the movable arm large cavity and the bucket rod small cavity is fully utilized, and meanwhile, the oil in the movable arm large cavity and the bucket rod small cavity is prevented from controlling an oil way oil return tank through the keeping valve; the structure is beneficial to recycling of energy, improves the system efficiency and reduces the energy consumption; the pilot push rod mechanism is pushed to act on the valve core of the hydraulic control one-way valve by the action of the external control oil way, so that the opening of the control oil way is realized, and further, the reverse opening of the main oil way is realized. The utility model discloses a load keeps the effective integration of valve internal control and outer accuse structure and function, on the basis of optimizing load and keeping the valve function, has improved stability, reliability. The external control oil way realizes reverse opening of the load holding valve and ensures smooth reverse oil way.
In the description of the present application, it is to be understood that the terms "central," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for the convenience of description and simplicity of description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the present disclosure.
The above description is only a preferred embodiment of the present invention, and it should be noted that: for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present invention.
Claims (10)
1. A load holding valve comprising a valve block; a first control chamber and a second control chamber are arranged in the valve block;
the first control chamber sequentially comprises a cavity B communicated with the port P, a cavity C communicated with the port A and a cavity G from bottom to top; the cavity B, the cavity C and the cavity G are coaxial, and the inner diameter of the cavity C is larger than that of the cavity B;
a holding valve spool is movably accommodated in the first control chamber;
the circumferential direction of the large head end of the valve core of the holding valve is movably sealed with the inner wall of the containing cavity G;
when the valve core of the holding valve is in a closed state, the small end of the valve core of the holding valve is sealed with the inner wall of the cavity B in the circumferential direction, and the communication between the cavity B and the cavity C is blocked;
when the valve core of the holding valve moves upwards, the valve core of the holding valve is opened, and the cavity B is communicated with the cavity C;
the cavity G is communicated with the cavity C through a throttling hole on a valve core of the maintaining valve;
the top end of the valve core of the holding valve limits the boundary of the first control chamber through a holding valve spring and a plug; the plug is fixedly connected with the valve block;
the second control chamber is sequentially provided with a limiting joint, a pilot push rod, a control oil way valve core, a control valve spring, a secondary control valve seat, a secondary control valve core, a secondary control valve spring and a spring seat; which comprises a cavity E, a cavity M and a cavity N,
the limiting joint and the spring seat are respectively and fixedly connected and arranged at the uppermost end and the lowermost end of the second control chamber; the limiting joint limits the upper end of the pilot push rod, a pilot oil port is formed in the upper end of the pilot push rod, and the K port is communicated with a pilot control oil way;
the pilot push rod is provided with a pilot pressure acting end with a larger diameter and a valve rod with a smaller diameter for pushing a valve core of the control oil path;
the lower end of the pilot push rod is in close contact with the upper end of the control oil way valve core and is used for pushing the control oil way valve core to move downwards and communicating the containing cavity D with the containing cavity E, and the containing cavity D is communicated with the containing cavity G of the first control chamber;
the cavity E is an area between the pilot push rod and the upper end of the control oil way valve core;
the cavity M is an area between the lower end of the valve core of the control oil way and the valve seat of the secondary control valve;
the cavity N is an area between the lower end of a valve seat of the secondary control valve and a valve core and a spring seat of the secondary control valve; the cavity N is communicated with the cavity B;
a throttle hole is formed in the valve core of the control oil way and is communicated with the cavity E and the cavity M;
the lower end of the valve core of the secondary control valve is movably arranged on the spring seat, the upper end of the valve core of the secondary control valve can be matched and sealed with the central channel of the valve seat of the secondary control valve,
and a secondary control valve spring is coaxially sleeved outside the secondary control valve spool, the upper end of the secondary control valve spring compresses the secondary control valve spool, and the lower end of the secondary control valve spring is connected and arranged on the spring seat.
2. The load holding valve of claim 1, wherein: the limiting device is fixedly installed on the inner wall of the second control chamber and used for limiting the lowest position of the moving position of the valve seat of the secondary control valve.
3. The load holding valve of claim 1, wherein: the valve core of the retaining valve is a cylindrical one-way cone valve, one end of the retaining valve is of a conical surface structure, the other end of the retaining valve is provided with a spring cavity, and a throttling hole communicated with the spring cavity is formed in the position of a retaining oil port behind the conical surface of the valve core of the retaining valve.
4. The load holding valve of claim 1, wherein: one end of the control oil way valve core is of a spherical surface structure, the other end of the control oil way valve core is of a cylindrical structure with a central cavity, and the spherical surface end is provided with a throttling hole communicated with the central cavity.
5. The load holding valve of claim 4, wherein: the valve seat of the secondary control valve comprises a cylinder with a smaller diameter and a cylinder with a larger diameter which are coaxially connected, and is provided with a central circulation cavity which is communicated up and down; wherein the cylinder with larger diameter is movably connected with the inner wall of the second control chamber in a sealing way in the circumferential direction; the central circulation cavity is communicated with the central cavity of the valve core of the control oil way.
6. The load holding valve of claim 5, wherein: and a first sealing ring is also arranged between the cylinder with the larger diameter of the valve seat of the secondary control valve and the inner wall of the second control chamber.
7. The load holding valve of claim 1, wherein: the pilot push rod is movably connected with the inner wall of the second control chamber in a sealing way in the circumferential direction of a pilot pressure acting end with a larger diameter;
and a second sealing ring is also arranged between the circumferential direction of the pilot pressure acting end with the larger diameter of the pilot push rod and the inner wall of the second control chamber.
8. The load holding valve of claim 1, wherein: the valve core of the secondary control valve is a cylindrical one-way cone valve with a T-shaped section; one end of the spherical sealing structure is of a cylindrical structure, and the other end of the spherical sealing structure is of a spherical sealing structure; the cylindrical end is movably arranged in a guide hole of the spring seat, and the spherical sealing end can be matched and sealed with the lower end of the valve seat of the secondary control valve.
9. The load holding valve of claim 1, wherein: the load holding valve comprises a main oil path and a secondary control oil path;
the valve core of the holding valve, the spring of the holding valve and the plug are arranged in the first control chamber to form a main oil path;
the limiting joint, the pilot push rod, the control oil way valve core, the control valve spring, the secondary control valve seat, the secondary control valve core, the limiting device, the secondary control valve spring and the spring seat are arranged in the second control chamber to form a secondary control oil way;
and the secondary control oil way is used for controlling the reverse opening of the main oil way.
10. A hydraulic system, characterized by: comprising a load holding valve according to any of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920247261.1U CN210013877U (en) | 2019-02-27 | 2019-02-27 | Load holding valve and hydraulic system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920247261.1U CN210013877U (en) | 2019-02-27 | 2019-02-27 | Load holding valve and hydraulic system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210013877U true CN210013877U (en) | 2020-02-04 |
Family
ID=69313074
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920247261.1U Withdrawn - After Issue CN210013877U (en) | 2019-02-27 | 2019-02-27 | Load holding valve and hydraulic system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210013877U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109826838A (en) * | 2019-02-27 | 2019-05-31 | 江苏徐工工程机械研究院有限公司 | Load holding valve |
| CN113898626A (en) * | 2021-08-31 | 2022-01-07 | 徐工集团工程机械股份有限公司 | Load holding device and load holding system |
| CN115217810A (en) * | 2022-07-05 | 2022-10-21 | 上海航空机械有限公司 | Reversely-opened plug-in type stop valve and method |
-
2019
- 2019-02-27 CN CN201920247261.1U patent/CN210013877U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109826838A (en) * | 2019-02-27 | 2019-05-31 | 江苏徐工工程机械研究院有限公司 | Load holding valve |
| CN109826838B (en) * | 2019-02-27 | 2023-09-05 | 江苏徐工工程机械研究院有限公司 | Load holding valve |
| CN113898626A (en) * | 2021-08-31 | 2022-01-07 | 徐工集团工程机械股份有限公司 | Load holding device and load holding system |
| CN113898626B (en) * | 2021-08-31 | 2023-11-07 | 徐工集团工程机械股份有限公司 | Load holding device and load holding system |
| CN115217810A (en) * | 2022-07-05 | 2022-10-21 | 上海航空机械有限公司 | Reversely-opened plug-in type stop valve and method |
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