CN109826838A - A kind of load holding valve - Google Patents
A kind of load holding valve Download PDFInfo
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- CN109826838A CN109826838A CN201910145299.2A CN201910145299A CN109826838A CN 109826838 A CN109826838 A CN 109826838A CN 201910145299 A CN201910145299 A CN 201910145299A CN 109826838 A CN109826838 A CN 109826838A
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Abstract
The invention discloses a kind of load holding valves, including valve block；The first control room, the second control room are provided in valve block；It keeps valve core, valve spring, screw plug is kept to be arranged in the first control room composition working connection；Positioning joint, guide's push rod, control oil circuit spool, control valve spring, Two-stage control valve base, Two-stage control valve core, limiting device, Two-stage control valve spring, spring base are arranged in the second control room and constitute Two-stage control oil circuit；Two-stage control oil circuit is used to control the reversed unlatching of working connection.It is connected in series structure type using hydraulic control one-way valve and check valve, realizes the Two-stage control for keeping valve control oil circuit, improve that load holding valve band carries stability and load keeps function.
Description
Technical field
The invention belongs to technical field of engineering machinery, in particular to a kind of load holding valve.
Background technique
Engineering machinery application environment is more severe, and operating condition is complicated, and uncontrollable factor is more；System stablizes especially band and carries shape
The stabilization of system is most important to the security performance of host under state.Hydraulic crawler excavator system carries settling amount, steady to swing arm, dipper band
It is qualitative to have strict requirements, to guarantee that swing arm, dipper band carry settling amount and stability is especially set in the big chamber of swing arm, the small chamber of dipper
Load holding valve is set, to guarantee the settling amount and stability of heavy duty, the big chamber of light duty downward moving arm, the small chamber of dipper.
The prior art has the following deficiencies: existing Hydraulic Excavator's Boom, dipper because internal leakage generates arm phenomenon.
Summary of the invention
Purpose: in order to overcome the deficiencies in the prior art, the present invention provides a kind of load holding valve.For engineering machine
There is the occasion of strict demand in tool excavator hydraulic system to swing arm, dipper settling amount, reaches the sedimentation for reducing swing arm, dipper
Amount improves the effect of equipment safety；Existing Hydraulic Excavator's Boom, dipper are eliminated because internal leakage generates arm phenomenon.
Technical solution: in order to solve the above technical problems, the technical solution adopted by the present invention are as follows:
A kind of load holding valve, including valve block；The first control room, the second control room are provided in the valve block；
First control room successively includes the cavity B being connected to P mouthfuls from the bottom up, with the A mouthfuls of cavity C being connected to of load, cavity
G；The cavity B, cavity C, cavity G are coaxial, and the internal diameter of cavity C is greater than the internal diameter of cavity B；
Holding valve core is accommodated in a manner of it can move in the first control room；
The inner wall movable sealing of the stub end circumferencial direction for keeping valve core and the cavity G；
When keeping valve core to be in close state, the small head end circumferencial direction for keeping valve core is interior with the cavity B's
It is sealed between wall, blocks the connection between cavity B and cavity C；
When keeping valve core to move up, valve core is kept to open, the connection between cavity B and cavity C；
By keeping the throttle orifice on valve core to be connected between the cavity G and cavity C；
The top for keeping valve core is by keeping valve spring and screw plug to limit the boundary of the first control room；The screw plug and valve
Block is fixedly connected；
Second control room includes successively from top to bottom cavity E, cavity M, cavity N, is disposed with limit from top to bottom and connects
Head, guide's push rod, control oil circuit spool, control valve spring, Two-stage control valve base, Two-stage control valve core, limiting device, two
Grade control valve spring, spring base；
Wherein, positioning joint, spring base are respectively fixedly connected with the top that the second control room is arranged in, bottom；Positioning joint
Guide's push rod upper end is limited, guide's push rod upper end is equipped with guide's hydraulic fluid port, K mouthfuls of logical pilot control oil circuits；
Guide's push rod has the valve for being used to push control oil circuit spool of larger-diameter pilot pressure effect end and small diameter
Bar；
Guide's push rod lower end and control oil circuit spool upper end are in close contact, and for pushing control oil circuit spool to move down, are connected to
Cavity D and cavity E, the cavity D are connected to the cavity G of the first control room；
The cavity E is the region between guide's push rod and control oil circuit spool upper end；
The cavity M is the region controlled between oil circuit spool lower end and Two-stage control valve base；
Region of the cavity N between Two-stage control valve base lower end, Two-stage control valve core and spring base；The cavity N
It is communicated with cavity B；
It is provided with throttle orifice in the control oil circuit spool, is connected to cavity E and cavity M；
The movement of Two-stage control valve core lower end mounts elastically, Two-stage control valve core upper end and Two-stage control valve valve
Seat central passage can cooperate sealing；
Two-stage control valve spring is coaxially arranged outside the Two-stage control valve core, Two-stage control valve spring upper end compresses Two-stage control
Valve core, the connection of Two-stage control valve spring lower end are arranged on spring base.
Further, the load holding valve further includes limiting device, and the limiting device is fixedly mounted on the second control
On the inner wall of room processed, the lowest order of the shift position for limiting Two-stage control valve base.
In the present invention, the logical direction valve of P mouth of the load holding valve, A Kou Tong executing agency, K mouthfuls of logical pilot control oil circuits.
Preferably, the holding valve core is cylinder unidirectional cone valve, and wherein one end is cone structure, other end tool
There is spring cavity, and keeps hydraulic fluid port position that there is the throttle orifice linked up with spring cavity after keeping the conical surface of valve core.
Preferably, described control oil circuit spool one end is spherical structure, and the other end is the cylinder with center cavity
Structure, and sphere end has the throttle orifice linked up with center cavity.
Preferably, the Two-stage control valve base includes coaxially connected small diameter cylindrical body and larger diameter
Cylindrical body；With center flowing lumen up and down；Wherein larger diameter cylinder circumferencial direction and second control chamber interior walls it
Between movable sealing connect；The center flowing lumen is connected with the center cavity of control oil circuit spool.
The control valve spring is set in outside the small diameter cylindrical body of Two-stage control valve base upper end, under control valve spring
For side pressure in Two-stage control valve base, upper end is pressed in control oil circuit spool bottom face.
Further, it is additionally provided between the Two-stage control valve base larger diameter cylinder and the second control chamber interior walls
First sealing ring.
Guide's push rod has between larger-diameter pilot pressure effect end circumferencial direction and the second control chamber interior walls
Movable sealing connection；
Further, guide's push rod has larger-diameter pilot pressure effect end circumferencial direction and the second control chamber interior walls
Between be additionally provided with the second sealing ring.
Preferably, the Two-stage control valve core is the cylinder unidirectional cone valve that section is T-type structure；One end is
Cylindrical structure, the other end are ball face sealing structure；Cylindrical end is movably arranged in the pilot hole of spring base, ball face sealing end and two
Grade control valve base lower end cooperation seals the lower end of center flowing lumen.
The load holding valve includes working connection and Two-stage control oil circuit；
The holding valve core keeps valve spring, screw plug to be arranged in the first control room composition working connection；
The positioning joint, guide's push rod, control oil circuit spool, control valve spring, Two-stage control valve base, Two-stage control valve valve
Core, limiting device, Two-stage control valve spring, spring base are arranged in the second control room and constitute Two-stage control oil circuit；
The Two-stage control oil circuit is used to control the reversed unlatching of the working connection.
On the other hand, the present invention also provides a kind of hydraulic systems, including above-mentioned load holding valve.
The utility model has the advantages that load holding valve provided by the invention, can eliminate existing Hydraulic Excavator's Boom, dipper is let out because in
It leaks and generates arm phenomenon；Load holding valve device is on the basis for fully absorbing pilot operated compound relief valve structure type and open theory
On, it proposes hydraulic control one-way valve and check valve cascaded structure form, realizes load holding valve performance boost, utilize oil liquid self-characteristic
And ball face sealing form realizes reliable sealing effect；The form that the present invention uses automatic control oil circuit to combine with external control oil circuit, from
Oil-control line structure ensure that load holding valve keeps stability, the reliability of function, and it is anti-that external control oil circuit realizes load holding valve
To open function；Meanwhile the present invention realizes control oil circuit closed loop configuration form, not only improves system effectiveness, but also reduce energy
Loss；The invention not only superior performance and structure is simple, realization easy to process.It has the advantage that
(1) present invention uses Two-stage control structure, is conducive to improve stability and safety that load keeps function, improves load
Impact resistance；
(2) load for improving load holding valve keeps function, reduces internal leakage；
(3) control oil circuit and working connection form closed loop controlling structure, can be effectively formed multistage closed containing cavity, improve Two-stage control valve
Control performance, enhance the sealing performance of load holding valve；
(4) Two-stage control valve uses ball face sealing structure, and ball face sealing can form reliable sealing structure to the heart and sealing surface；
(5) Two-stage control valve arrangement is simple, easy to process, assembly, it is easy to accomplish.
Detailed description of the invention
Fig. 1 is the load holding valve structural schematic diagram of embodiment；
Fig. 2 is load holding valve auxiliary oil way cutting structure chart；
Fig. 3 is load holding valve schematic diagram；
In figure: valve block 1, keep valve core 2, screw plug 3, keep valve spring 4, positioning joint 5, technique stifled 6, control oil circuit spool 7,
Spring base 8, Two-stage control valve base 9, Two-stage control valve core 10, limiting device 11, control valve spring 12, Two-stage control valve bullet
Spring 13, guide's push rod 14, the first sealing ring 15, the second sealing ring 16.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Below
Description only actually at least one exemplary embodiment be it is illustrative, never as to the present invention and its application or make
Any restrictions.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Under every other embodiment obtained, shall fall within the protection scope of the present invention.
Unless specifically stated otherwise, positioned opposite, the digital table of the component and step that otherwise illustrate in these embodiments
It is not limited the scope of the invention up to formula and numerical value.Simultaneously, it should be appreciated that for ease of description, each portion shown in attached drawing
The size divided not is to draw according to actual proportionate relationship.For technology, side known to person of ordinary skill in the relevant
Method and equipment may be not discussed in detail, but in the appropriate case, and the technology, method and apparatus should be considered as authorizing explanation
A part of book.In shown here and discussion all examples, any occurrence should be construed as merely illustratively, and
Not by way of limitation.Therefore, the other examples of exemplary embodiment can further include different values.It should also be noted that similar mark
Number and letter similar terms are indicated in following attached drawing, therefore, once be defined in a certain Xiang Yi attached drawing, then subsequent
It does not need that it is further discussed in attached drawing.
Embodiment 1
As shown in Figure 1 and Figure 2, a kind of load holding valve, including valve block 1；The first control room, second are provided in the valve block 1
Control room；
First control room successively includes the cavity B being connected to P mouthfuls from the bottom up, with the A mouthfuls of cavity C being connected to of load, cavity
G；The cavity B, cavity C, cavity G are coaxial, and the internal diameter of cavity C is greater than the internal diameter of cavity B；
It is accommodated in a manner of it can move in the first control room and keeps valve core 2；
The inner wall movable sealing of the stub end circumferencial direction for keeping valve core 2 and the cavity G；
When keeping valve core 2 to be in close state, the small head end circumferencial direction for keeping valve core 2 is with the cavity B's
It is sealed between inner wall, blocks the connection between cavity B and cavity C；
When keeping valve core 2 to move up, valve core 2 is kept to open, the connection between cavity B and cavity C；
By keeping the throttle orifice on valve core 2 to be connected between the cavity G and cavity C；
The top for keeping valve core 2 is by keeping valve spring 4 and screw plug 3 to limit the boundary of the first control room；The screw plug 3
It is fixedly connected with valve block 1；
Second control room is disposed with positioning joint 5, guide's push rod 14, control oil circuit spool 7, control valve from top to bottom
Spring 12, Two-stage control valve base 9, Two-stage control valve core 10, limiting device 11, Two-stage control valve spring 13, spring base 8；
From top to bottom successively include cavity E, cavity M, cavity N,
Wherein, positioning joint 5, spring base 8 are respectively fixedly connected with the top that the second control room is arranged in, bottom；Limit connects
The limit of 14 upper end of first 5 pairs of guide's push rods, 14 upper end of guide's push rod are equipped with guide's hydraulic fluid port, K mouthfuls of logical pilot control oil circuits；
What guide's push rod 14 had larger-diameter pilot pressure effect end and a small diameter controls oil circuit spool 7 for pushing
Valve rod；
14 lower end of guide's push rod and control 7 upper end of oil circuit spool are in close contact, for pushing control oil circuit spool 7 to move down,
It is connected to cavity D and cavity E, the cavity D is connected to the cavity G of the first control room；
The cavity E is the region between guide's push rod 14 and control 7 upper end of oil circuit spool；
The cavity M is the region controlled between 7 lower end of oil circuit spool and Two-stage control valve base 9；
Region of the cavity N between 9 lower end of Two-stage control valve base, Two-stage control valve core 10 and spring base 8；The appearance
Chamber N is communicated with cavity B；
It is provided with throttle orifice in the control oil circuit spool 7, is connected to cavity E and cavity M；
10 lower end of the Two-stage control valve core movement is mounted on spring base 8,10 upper end of Two-stage control valve core and second level control
9 central passage of valve base processed can cooperate sealing,
Two-stage control valve spring 13 is coaxially arranged outside the Two-stage control valve core 10,13 upper end of Two-stage control valve spring compresses two
Grade control valve core 10, the connection of 13 lower end of Two-stage control valve spring are arranged on spring base 8.
It further include limiting device 11, the limiting device 11 is fixedly mounted on the inner wall of the second control room, for limiting
The lowest order of the shift position of Two-stage control valve base 9.
The holding valve core 2 is cylinder unidirectional cone valve, and wherein one end is cone structure, and the other end has spring cavity, and
Keep hydraulic fluid port position that there is the throttle orifice linked up with spring cavity after keeping the conical surface of valve core 2.
Further, described 7 one end of control oil circuit spool is spherical structure, and the other end is the cylinder knot with center cavity
Structure, and sphere end has the throttle orifice linked up with center cavity.
In some embodiments, as shown in Figure 1 and Figure 2, the Two-stage control valve base 9 is smaller straight including what is be coaxially connected
Diameter cylindrical body and larger diameter cylinder；With center flowing lumen up and down；Wherein larger diameter cylinder circumferencial direction
Movable sealing is connect between the second control chamber interior walls；The center cavity and cavity M of the center flowing lumen and control oil circuit spool 7
It is connected.
The control valve spring 12 is set in outside the small diameter cylindrical body of 9 upper end of Two-stage control valve base, control valve bullet
12 lower end of spring is pressed in Two-stage control valve base 9, and upper end is pressed in control 7 bottom face of oil circuit spool.
Further, it is also set up between 9 larger diameter cylinder of Two-stage control valve base and the second control chamber interior walls
There is the first sealing ring 15.
In some embodiments, as shown in Figure 1 and Figure 2, guide's push rod 14 has larger-diameter pilot pressure effect
Movable sealing between circumferencial direction and the second control chamber interior walls is held to connect；
Further, guide's push rod 14 has in larger-diameter pilot pressure effect end circumferencial direction and the second control room
The second sealing ring 16 is additionally provided between wall.
In some embodiments, as shown in Figure 1 and Figure 2, the Two-stage control valve core 10 is the circle that section is T-type structure
Column unidirectional cone valve；One end is cylindrical structure, and the other end is ball face sealing structure；Cylindrical end is movably arranged on the guiding of spring base 8
Kong Zhong, ball face sealing end and 9 lower end of Two-stage control valve base, which cooperate, seals the lower end of center flowing lumen.
In some embodiments, as shown in Figure 1 and Figure 2, a kind of load holding valve, including working connection and Two-stage control oil circuit；
Including valve block 1, valve core 2, screw plug 3, holding valve spring 4, positioning joint 5, technique is kept to block up 6, control oil circuit spool 7, spring
Seat 8, Two-stage control valve base 9, Two-stage control valve core 10, limiting device 11, control valve spring 12, Two-stage control valve spring
13, guide's push rod 14；
The holding valve core 2 keeps valve spring 4, screw plug 3 to be arranged in the first control room composition working connection；
The positioning joint 5, guide's push rod 14, control oil circuit spool 7, control valve spring 12, Two-stage control valve base 9, second level
Control valve core 10, limiting device 11, Two-stage control valve spring 13, spring base 8 are arranged in the second control room and constitute Two-stage control
Oil circuit；
The reversed unlatching of Two-stage control oil circuit control working connection；It is O-shaped function to position in the direction valve of load holding valve fuel feeding；Its
Detailed construction is as shown in Figure 1 and Figure 2, its principle is as shown in Figure 3.
As shown in figure 3, a kind of hydraulic system, including above-mentioned load holding valve.
Implementation principle of the invention:
(1) to equipment fuel feeding:
P mouthfuls of logical direction valves, A Kou Tong executing agency, K mouthfuls of logical pilot control oil circuits；When P mouthfuls of oil inlets, keep valve core 2 in P mouthfuls of oil
It is moved up under action of hydraulic force, oil liquid the moving up with holding 2 position of valve core of cavity D, G, pressure rise, when cavity D, G pressure
When greater than A mouthfuls of pressure, oil liquid is by keeping the throttle orifice on valve core 2 to lead to A mouthfuls in cavity D, G, cavity D, G pressure reduction,
Valve core 2 is kept to fully open, at this point, cavity B is communicated with cavity A, P mouthfuls to equipment fuel feeding.
(2) equipment oil return:
Illustrate: A mouthfuls are connected with the big chamber of swing arm or the small chamber of dipper, the small chamber of swing arm or the big chamber oil inlet of dipper, the big chamber of swing arm or dipper
Small chamber oil return, under the action of swing arm, dipper load outside at this time, the big chamber of swing arm, the small cavity pressure of dipper are greater than the small chamber of swing arm, dipper
Big cavity pressure；
When A mouthfuls of oil returns, A mouthfuls of pressure are greater than P mouthfuls of pressure, and P mouthfuls lead to T mouthfuls through reversal valve, and hydraulic fluid port K leads to guide oil, guide oil at this time
Guide's push rod 14 is pushed to move downward, guide's push rod 14 pushes control oil circuit spool 7 to move, and A mouthfuls of pressure are through keeping on valve core 2
Throttle orifice enter cavity D, G, when guide's push rod 14 push control oil circuit spool 7 move after, cavity D, E are communicated, in cavity E
Oil liquid is by the throttle orifice of control 7 bottom of oil circuit spool to cavity M, and because cavity N is communicated with cavity B, and cavity B, N are relative to appearance
Chamber M is low pressure chamber, and Two-stage control valve core 10 is opened, so far, cavity D, G release；Keep valve core 2 under the action of load force
It opens, cavity B is communicated with cavity A, keeps valve reversely to open, A mouthfuls of oil liquid of equipment are through cavity B, direction valve to T mouthfuls of oil returns
Case.
(3) load holding valve keeps load:
When load holding valve, which plays load, keeps function, cavity B, N are communicated by internal oil passages, and cavity B, N form closed appearance
Chamber；Two-stage control valve core 10 is fail to open, and cavity M is caused to form closed containing cavity, and control oil circuit spool 7 fail to open, keeps
The influence of the uncontrolled oil circuit spool 7 of oil liquid pressure in cavity D, G；Through above to load oil circuit and control oil circuit analysis,
It loads oil circuit and control oil circuit forms closed loop, reliable performance guarantee is formed to holding valve core 2.
The oil liquid of load port A chamber is communicated with cavity C, and pressure oil is through keeping the throttle orifice on valve core 2 to cavity in cavity C
G,D；Under equipoise, the oil liquid pressure in cavity D, G chamber is equal with the oil liquid pressure in cavity C, but oily in cavity G
Liquid, which acts on, keeps the area of valve core 2 to be greater than the area that oil liquid in cavity C acts on holding valve core 2, and valve core 2 is kept to exist
Under the action of area differential pressure, and under the action of keeping valve spring 4, firmly combined with the conical surface of valve block 1, formed it is firm,
Reliable sealing, it is ensured that the oil liquid in load port A does not leak, and the stability of load is effectively guaranteed.
The structure type that the present invention is connected in series using hydraulic control one-way valve and check valve realizes the Two-stage control of control oil circuit,
Effectively improve load holding valve control effect；Meanwhile Two-stage control oil circuit uses ball face sealing structure form, ball face sealing structure
With heart function is made by oneself, sealing effect is improved, internal leakage is significantly reduced, guarantees the stability of system；Two-stage control oil circuit is real
Existing closed loop controlling structure, the small chamber of the big chamber of swing arm, dipper keep the control chamber oil liquid of valve through oil circuit to main reversing valve, it is big to improve swing arm
The energy regeneration function of the small chamber of chamber, dipper, the i.e. big chamber of raising swing arm, the small chamber oil liquid of dipper to the small chamber of swing arm, the oil of the big chamber of dipper
Liquid makes full use of the small chamber oil liquid of the big chamber of swing arm, dipper, meanwhile, prevent the small chamber oil liquid of the big chamber of swing arm, dipper and is kept valve control
Oil circuit oil return box；This structure is conducive to the recycling and reusing of energy, improves system effectiveness and reduces energy consumption；Oil is controlled using external control
The effect on road pushes guide's transfer bar mechanism to act on fluid-control one-way valve core, realizes the unlatching of control oil circuit, and then realize main oil
The reversed unlatching on road.The present invention realizes effectively integrating for load holding valve internal control and external control structure and function, loads in optimization
On the basis of keeping valve function, stability, reliability are improved.The reversed unlatching of external control oil circuit realization load holding valve, it is ensured that
Reversed oil circuit is unobstructed.
In the description of the present application, it is to be understood that term " center ", " longitudinal direction ", " transverse direction ", "front", "rear",
The orientation or positional relationship of the instructions such as "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside" is based on attached drawing institute
The orientation or positional relationship shown is only that this is practical for ease of description and simplifies description, rather than indicates or imply signified device
Or element must have a particular orientation, construct and operate for specific orientation, thus should not be understood as in this practical protection
The limitation of appearance.
The above is only a preferred embodiment of the present invention, it should be pointed out that: for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (10)
1. a kind of load holding valve, which is characterized in that including valve block；The first control room, the second control are provided in the valve block
Room；
First control room successively includes the cavity B being connected to P mouthfuls from the bottom up, with the A mouthfuls of cavity C being connected to of load, cavity
G；The cavity B, cavity C, cavity G are coaxial, and the internal diameter of cavity C is greater than the internal diameter of cavity B；
Holding valve core is accommodated in a manner of it can move in the first control room；
The inner wall movable sealing of the stub end circumferencial direction for keeping valve core and the cavity G；
When keeping valve core to be in close state, the small head end circumferencial direction for keeping valve core is interior with the cavity B's
It is sealed between wall, blocks the connection between cavity B and cavity C；
When keeping valve core to move up, valve core is kept to open, the connection between cavity B and cavity C；
By keeping the throttle orifice on valve core to be connected between the cavity G and cavity C；
The top for keeping valve core is by keeping valve spring and screw plug to limit the boundary of the first control room；The screw plug and valve
Block is fixedly connected；
Second control room is disposed with positioning joint, guide's push rod, control oil circuit spool, control valve spring, second level control
Valve base processed, Two-stage control valve core, Two-stage control valve spring, spring base；Including cavity E, cavity M, cavity N,
Wherein, positioning joint, spring base are respectively fixedly connected with the top that the second control room is arranged in, bottom；Positioning joint
Guide's push rod upper end is limited, guide's push rod upper end is equipped with guide's hydraulic fluid port, K mouthfuls of logical pilot control oil circuits；
Guide's push rod has the valve for being used to push control oil circuit spool of larger-diameter pilot pressure effect end and small diameter
Bar；
Guide's push rod lower end and control oil circuit spool upper end are in close contact, and for pushing control oil circuit spool to move down, are connected to
Cavity D and cavity E, the cavity D are connected to the cavity G of the first control room；
The cavity E is the region between guide's push rod and control oil circuit spool upper end；
The cavity M is the region controlled between oil circuit spool lower end and Two-stage control valve base；
Region of the cavity N between Two-stage control valve base lower end, Two-stage control valve core and spring base；The cavity N
It is communicated with cavity B；
It is provided with throttle orifice in the control oil circuit spool, is connected to cavity E and cavity M；
The movement of Two-stage control valve core lower end mounts elastically, Two-stage control valve core upper end and Two-stage control valve valve
Seat central passage can cooperate sealing,
Two-stage control valve spring is coaxially arranged outside the Two-stage control valve core, Two-stage control valve spring upper end compresses Two-stage control
Valve core, the connection of Two-stage control valve spring lower end are arranged on spring base.
2. load holding valve according to claim 1, it is characterised in that: further include limiting device, the limiting device is solid
Dingan County is on the inner wall of the second control room, the lowest order of the shift position for limiting Two-stage control valve base.
3. load holding valve according to claim 1, it is characterised in that: the holding valve core is cylinder unidirectional cone valve,
Wherein one end is cone structure, and the other end has spring cavity, and keeps hydraulic fluid port position to have and bullet after keeping the conical surface of valve core
The throttle orifice that spring chamber is linked up.
4. load holding valve according to claim 1, it is characterised in that: described control oil circuit spool one end is spherical surface knot
Structure, the other end is the cylindrical structure with center cavity, and sphere end has the throttle orifice linked up with center cavity.
5. load holding valve according to claim 4, it is characterised in that: the Two-stage control valve base includes coaxial is connected
Small diameter cylindrical body and larger diameter cylinder, and there is center flowing lumen up and down；Wherein larger diameter cylinder
Movable sealing connects between body circumferencial direction and the second control chamber interior walls；The center of the center flowing lumen and control oil circuit spool
Chamber is connected.
6. load holding valve according to claim 5, it is characterised in that: the Two-stage control valve base larger diameter cylinder
The first sealing ring is additionally provided between body and the second control chamber interior walls.
7. load holding valve according to claim 1, it is characterised in that: guide's push rod has larger-diameter guide
Pressure acts on movable sealing between end circumferencial direction and the second control chamber interior walls and connects；
Guide's push rod has also to be set between larger-diameter pilot pressure effect end circumferencial direction and the second control chamber interior walls
It is equipped with the second sealing ring.
8. load holding valve according to claim 1, it is characterised in that: it is T-type that the Two-stage control valve core, which is section,
The cylinder unidirectional cone valve of structure；One end is cylindrical structure, and the other end is ball face sealing structure；Cylindrical end is movably arranged on spring
In the pilot hole of seat, ball face sealing end can cooperate with Two-stage control valve base lower end to be sealed.
9. load holding valve according to claim 1, it is characterised in that: the load holding valve includes working connection and second level
Control oil circuit；
It keeps valve core, valve spring, screw plug is kept to be arranged in the first control room composition working connection；
Positioning joint, guide's push rod, control oil circuit spool, control valve spring, Two-stage control valve base, Two-stage control valve core,
Limiting device, Two-stage control valve spring, spring base are arranged in the second control room and constitute Two-stage control oil circuit；
The Two-stage control oil circuit is used to control the reversed unlatching of the working connection.
10. a kind of hydraulic system, it is characterised in that: including the described in any item load holding valves of claim 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910145299.2A CN109826838B (en) | 2019-02-27 | 2019-02-27 | Load holding valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910145299.2A CN109826838B (en) | 2019-02-27 | 2019-02-27 | Load holding valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109826838A true CN109826838A (en) | 2019-05-31 |
| CN109826838B CN109826838B (en) | 2023-09-05 |
Family
ID=66864725
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910145299.2A Active CN109826838B (en) | 2019-02-27 | 2019-02-27 | Load holding valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109826838B (en) |
Cited By (4)
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| CN110230617A (en) * | 2019-06-24 | 2019-09-13 | 徐州阿马凯液压技术有限公司 | A kind of novel load holding valve |
| CN112855639A (en) * | 2019-11-27 | 2021-05-28 | 哈威液压股份公司 | Load holding valve, load holding valve group and method for assembling load holding valve |
| CN112879365A (en) * | 2021-01-19 | 2021-06-01 | 龙工（上海）精工液压有限公司 | Load holding valve for excavator |
| CN113124012A (en) * | 2021-04-06 | 2021-07-16 | 中联重科股份有限公司 | Load holding valve and construction machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110230617A (en) * | 2019-06-24 | 2019-09-13 | 徐州阿马凯液压技术有限公司 | A kind of novel load holding valve |
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| CN112855639A (en) * | 2019-11-27 | 2021-05-28 | 哈威液压股份公司 | Load holding valve, load holding valve group and method for assembling load holding valve |
| CN112855639B (en) * | 2019-11-27 | 2023-06-06 | 哈威液压股份公司 | Load holding valve, load holding valve block and method for assembling a load holding valve |
| CN112879365A (en) * | 2021-01-19 | 2021-06-01 | 龙工（上海）精工液压有限公司 | Load holding valve for excavator |
| CN113124012A (en) * | 2021-04-06 | 2021-07-16 | 中联重科股份有限公司 | Load holding valve and construction machine |
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| CN109826838B (en) | 2023-09-05 |
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