CN110873086A - Integrated valve group and hydraulic system - Google Patents
Integrated valve group and hydraulic system Download PDFInfo
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- CN110873086A CN110873086A CN201911283469.XA CN201911283469A CN110873086A CN 110873086 A CN110873086 A CN 110873086A CN 201911283469 A CN201911283469 A CN 201911283469A CN 110873086 A CN110873086 A CN 110873086A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B2013/002—Modular valves, i.e. consisting of an assembly of interchangeable components
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- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention discloses an integrated valve group and a hydraulic system. The integrated valves include an oil inlet, at least two oil outlet groups, at least two control valve groups, a load pressure feedback port and an oil pressure comparison valve group, at least two oil outlet groups are configured to control different actuating mechanisms to act, each oil outlet group includes at least one oil outlet, at least two control valve groups correspond to at least two oil outlet groups, each control valve group is arranged between the oil inlet and the oil outlet group, the oil pressure comparison valve group is arranged between at least two oil outlet groups and the load pressure feedback port, and the oil pressure comparison valve group compares the oil outlet pressure of at least two oil outlet groups and transmits the pressure of the oil outlet group with the highest oil outlet pressure in the at least two oil outlet groups to the load pressure feedback port. The integrated valve group integrates control valve groups used for controlling different actuating mechanisms, thereby reducing the complexity of the whole hydraulic system and improving the reliability of the hydraulic system.
Description
Technical Field
The invention relates to the technical field of engineering machinery, in particular to an integrated valve group and a hydraulic system.
Background
At present, independent hydraulic valve blocks are adopted in a hydraulic system of large-scale heavy-duty engineering machinery, each valve block comprises an electromagnetic valve, a shuttle valve, a one-way valve, a safety valve, each pore channel and the like, and the pressure of a working oil port of each valve block is output through a corresponding control oil port, so that the control of each system is realized. Because the hydraulic valve block is used more, the structure of the hydraulic oil circuit is complex, the size is large, and the arrangement of the connecting point pipeline connected with the valve block is messy. And the more hydraulic valve piece makes whole hydraulic system assembly complicated, and later stage maintenance is inconvenient, and the oil pipe and the coupling that use are more has also increased the risk of valve piece oil leak. In addition, as the number of valve blocks is increased, the discretization of the hydraulic system in terms of function, structure and form is serious, so that the reliability and concentration of the hydraulic system are low, and the cost is high.
Disclosure of Invention
The invention aims to provide an integrated valve group and a hydraulic system so as to reduce the complexity of the hydraulic system.
A first aspect of the present invention provides an integrated valve assembly, comprising:
an oil inlet;
at least two outlet groups configured to control different actuator actions and each outlet group comprising at least one outlet;
the control valve groups are arranged corresponding to the oil outlet groups, and each control valve group is arranged between the oil inlet and the oil outlet group;
a load pressure feedback port; and
and the oil pressure comparison valve group is arranged between the at least two oil outlet groups and the load pressure feedback port, compares the oil outlet pressures of the at least two oil outlet groups and transmits the pressure of the oil outlet group with the highest oil outlet pressure in the at least two oil outlet groups to the load pressure feedback port.
In some embodiments, the oil pressure comparison valve set comprises a shuttle valve set comprising at least two shuttle valves.
In some embodiments, the at least two sets of oil outlets include a first set of oil outlets and a second set of oil outlets, the at least two shuttle valves include a first shuttle valve and a second shuttle valve, the oil outlet of the first shuttle valve is connected to the load pressure feedback port, the first oil inlet of the first shuttle valve is connected to the oil inlet, the second oil inlet of the first shuttle valve is connected to the oil outlet of the second shuttle valve, the first oil inlet of the second shuttle valve is connected to the first set of oil outlets, and the second oil inlet of the second shuttle valve is connected to the second set of oil outlets.
In some embodiments, the first oil outlet group comprises two oil outlets, the second oil outlet group comprises one oil outlet, the at least two shuttle valves further comprise a third shuttle valve, two oil inlets of the third shuttle valve are respectively connected with the two oil outlets of the first oil outlet group, an oil outlet of the third shuttle valve is connected with a first oil inlet of the second shuttle valve, and a second oil inlet of the second shuttle valve is connected with one oil outlet of the second oil outlet group.
In some embodiments, the integrated valve pack further comprises a one-way damping valve disposed between the oil pressure comparison valve pack and the load pressure feedback port; and/or the integrated valve group also comprises a filtering device arranged between the oil pressure comparison valve group and the load feedback port.
In some embodiments, the integrated valve pack further comprises a dynamic damping valve disposed between the load pressure feedback port and the return port.
In some embodiments, the at least two sets of oil outlets include a brake control set of oil outlets, a suspension control set of oil outlets, an external set of oil outlets, and a winch control set of oil outlets.
In some embodiments, the suspension control port set includes a first oil outlet connected to the rodless chamber of the suspension cylinder and a second oil outlet connected to the rod chamber of the suspension cylinder, and the at least two control valve sets include a suspension control valve set including an overflow valve connected to the second oil outlet and a check valve connected in parallel to the overflow valve.
In some embodiments, the set of brake control ports includes a brake control port, and the at least two sets of control ports include a set of brake control ports including a flow control valve connected to the brake control port.
A second aspect of the invention provides a hydraulic system comprising an integrated valve pack according to any one of the first aspect of the invention.
Based on the technical scheme provided by the invention, the integrated valve group comprises an oil inlet, at least two oil outlet groups, at least two control valve groups, a load pressure feedback port and an oil pressure comparison valve group, wherein the at least two oil outlet groups are configured to control different execution mechanisms to act, each oil outlet group comprises at least one oil outlet, the at least two control valve groups and the at least two oil outlet groups are correspondingly arranged, each control valve group is arranged between the oil inlet and the oil outlet group, the oil pressure comparison valve group is arranged between the at least two oil outlet groups and the load pressure feedback port, and the oil pressure comparison valve group compares the oil outlet pressures of the at least two oil outlet groups and transmits the pressure of the oil outlet group with the highest oil outlet pressure in the at least two oil outlet groups to. The integrated valve group integrates control valve groups used for controlling different actuating mechanisms, thereby reducing the complexity of the whole hydraulic system and improving the reliability of the hydraulic system. In addition, the integrated valve group selects the highest load pressure in each actuating mechanism by arranging the oil pressure comparison valve group and feeds the highest load pressure back to the load pressure feedback port, so that the work of each actuating mechanism is not interfered with one another, and the working reliability of the hydraulic system is further improved.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a hydraulic schematic diagram of an integrated valve pack according to an embodiment of the present invention.
Each reference numeral represents:
1. filtering with a screen; 2. a one-way damping valve; 3. a first shuttle valve; 4. a dynamic damping valve; 5. a first damping; 6. a pilot unloader valve; 7. a second damping; 8. a first check valve; 9. a first pressure reducing valve; 10. a third damping; 11. a two-position three-way electromagnetic valve; 12. a flow control valve; 13. a second one-way valve; 14. a first hydraulic control check valve; 15. a second pressure reducing valve; 16. a second shuttle valve; 17. an electromagnetic directional valve; 18. a second hydraulic control one-way valve; 19. a first overflow valve; 20. a third shuttle valve; 24. a fourth shuttle valve; 28. a fifth shuttle valve; 29. an electromagnetic directional valve; 30. a sixth shuttle valve; 31. an electromagnetic directional valve; 32. a seventh shuttle valve.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
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 unless specifically stated otherwise. 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 have 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.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously positioned and the spatially relative descriptors used herein interpreted accordingly.
The hydraulic system of the embodiment of the invention comprises at least two actuating mechanisms and an integrated valve group. The integrated valve group is used for controlling at least two actuators to work.
Referring to fig. 1, an integrated valve pack according to an embodiment of the present invention includes:
an oil inlet;
at least two oil outlet groups, each oil outlet group comprising at least one oil outlet;
the control valve groups are arranged corresponding to the oil outlet groups, and each control valve group is arranged between the oil inlet and the corresponding oil outlet group;
a load pressure feedback port Ls; and
and the oil pressure comparison valve group is arranged between the at least two oil outlet groups and the load pressure feedback port Ls, compares the oil outlet pressures of the at least two oil outlet groups and transmits the pressure of the oil outlet group with the highest oil outlet pressure in the at least two oil outlet groups to the load pressure feedback port Ls.
The integrated valve group integrates control valve groups used for controlling different actuating mechanisms, so that the complexity of the whole hydraulic system is reduced, and the reliability of the hydraulic system is improved. In addition, the integrated valve group of the embodiment of the invention selects the highest load pressure in each actuating mechanism by arranging the oil pressure comparison valve group and feeds the highest load pressure back to the load pressure feedback port, so that the work of each actuating mechanism does not interfere with each other, and the working reliability of the hydraulic system is further improved.
In this embodiment, the oil pressure comparison valve group includes a shuttle valve group including at least two shuttle valves.
Specifically, the at least two oil outlet groups comprise a first oil outlet group and a second oil outlet group, the at least two shuttle valves comprise a first shuttle valve and a second shuttle valve, an oil outlet of the first shuttle valve is connected with the load pressure feedback port, a first oil inlet of the first shuttle valve is connected with an oil inlet, a second oil inlet of the first shuttle valve is connected with an oil outlet of the second shuttle valve, a first oil inlet of the second shuttle valve is connected with the first oil outlet group, and a second oil inlet of the second shuttle valve is connected with the second oil outlet group.
In one embodiment, the first oil outlet group comprises two oil outlets, the second oil outlet group comprises one oil outlet, the at least two shuttle valves further comprise a third shuttle valve, two oil inlets of the third shuttle valve are respectively connected with the two oil outlets of the first oil outlet group, an oil outlet of the third shuttle valve is connected with a first oil inlet of the second shuttle valve, and a second oil inlet of the second shuttle valve is connected with one oil outlet of the second oil outlet group.
In another embodiment, the first and second outlet groups each include two outlets, and the shuttle valve group includes two third shuttle valves disposed corresponding to the first and second outlet groups.
The integrated valve set of the embodiment further comprises a dynamic damping valve arranged between the load pressure feedback port and the oil return port. When each control valve group is switched from a working position to a non-working position, pressure oil in the load feedback oil circuit of the integrated valve group flows back to the oil return port through the dynamic damping valve so as to avoid oil liquid staying in the oil circuit when the control valve group is in a middle position, and when each control valve group is switched between the working position and the non-working position, the dynamic damping valve also plays a role in filtering load feedback pressure fluctuation and further slowing down load feedback pressure impact.
In order to improve the stability of the hydraulic system, the integrated valve set of the embodiment further comprises a one-way damping valve arranged between the shuttle valve set and the load sensitive feedback oil port. When the load feedback pressure is gradually increased, the one-way damping valve realizes the function of the one-way valve to feed the load feedback pressure back to the load sensitive pump for adjusting the displacement of the load sensitive pump so that the load sensitive pump can quickly respond along with the load demand; when the load feedback pressure is gradually reduced, the one-way valve of the one-way damping valve is closed, and the load feedback pressure slowly reduces the pressure received by the load pressure feedback port through throttling, so that the discharge capacity of the load sensitive pump is slowly reduced, the output pressure stability of the load sensitive pump is improved, and the stability of a hydraulic system is further improved.
The integrated valve group also comprises a filtering device arranged between the shuttle valve group and the load pressure feedback port. The filter device prevents debris and the like from flowing into a load feedback loop of the load sensitive pump and plays a role in protecting the hydraulic system. Particularly, the filtering device can be a filter screen, the structure of the filter screen is simple, the installation and the replacement are convenient, and the cost is low.
The structure of the integrated valve block according to the embodiment of the present invention will be described in detail with reference to fig. 1.
As shown in fig. 1, the first oil inlet P1 and the second oil inlet P2 of the integrated valve group of the present embodiment are internally communicated, and the outside of the oil inlet pressure measuring port MP is connected with a pressure measuring joint to detect the pressure of the first oil inlet P1 and the second oil inlet P2. The first oil return port T1 and the second oil return port T2 are communicated with each other, and a pressure measuring joint is connected to the outer side of the oil return pressure measuring port MT to detect the pressure of the first oil return port T1 and the second oil return port T2. And the integrated valve group of the embodiment is also provided with a third oil return port T3.
The shuttle valve set of the present embodiment includes a first shuttle valve 3, a second shuttle valve 16, a third shuttle valve 20, a fourth shuttle valve 24, a fifth shuttle valve 28, a sixth shuttle valve 30, and a seventh shuttle valve 32.
The integrated valve set of the embodiment comprises a brake control module, a suspension control module, an external oil source control module and a winch control module.
Correspondingly, the at least two oil outlet groups comprise a braking control oil port group, a suspension control oil port group, an external oil port group and a winch control oil port group. Specifically, as shown in fig. 1, the brake control port group includes a first oil outlet PB. The hydraulic system of the embodiment comprises a left suspension oil cylinder and a right suspension oil cylinder, and correspondingly, the at least two oil outlet groups comprise a left suspension control oil port group and a right suspension control oil port group, wherein the left suspension control oil port group comprises a second oil outlet A1 connected with a rodless cavity of the left suspension oil cylinder and a third oil outlet B1 connected with a rod cavity of the left suspension oil cylinder; the right suspension control oil port group comprises a fourth oil outlet B2 connected with a rodless cavity of the right suspension oil cylinder and a fifth oil outlet A2 connected with a rod cavity of the right suspension oil cylinder. The external oil port group comprises a sixth oil outlet A3. The winch control oil port group comprises a seventh oil outlet A4 and an eighth oil outlet B4.
The brake control valve group comprises a first damper 5, a pilot unloading valve 6, a second damper 7, a first one-way valve 8, a first pressure reducing valve 9, a third damper 10, a two-position three-way electromagnetic valve 11 and a flow control valve 12, hydraulic oil from a load sensitive pump enters from a first oil inlet P1 of the integrated valve group, is connected with the pilot unloading valve 6 through the first damper 5 and is connected with the first one-way valve 8 through the second damper 7, an inlet of the first pressure reducing valve 9 is connected with the first one-way valve 8, an outlet of the first pressure reducing valve 9 is connected with an oil inlet of the two-position three-way electromagnetic valve 11 through the third damper 10, and an oil inlet of the flow control valve 12 is connected with an oil outlet of the two-position three. The outlet port of the flow control valve 12 forms a first outlet port PB. The integrated valve set of this embodiment further includes an oil outlet pressure tap MPB communicated with the first oil outlet PB.
The left suspension control valve group comprises an electromagnetic directional valve 17, a second reducing valve 15, a second check valve 13, a first overflow valve 19, a first hydraulic control check valve 14 and a second hydraulic control check valve 18. An oil inlet of the electromagnetic directional valve 17 is connected with a first oil inlet P1, an oil return port of the electromagnetic directional valve 17 is connected with a first oil return port T1, when the electromagnetic directional valve 17 is located at a middle position, a second oil outlet A1 of the integrated valve group is connected with a rodless cavity of the left suspension oil cylinder, a third oil outlet B1 is connected with a rod cavity of the left suspension oil cylinder, the second oil outlet A1 is connected with an oil outlet of the electromagnetic directional valve 17 through a first hydraulic control one-way valve 14 and a second one-way valve 13, a third oil outlet B1 is connected with an oil outlet of the electromagnetic directional valve 17 through a first overflow valve 19 and a second hydraulic control one-way valve 18, two ends of a second shuttle valve 16 are respectively connected with two oil outlets of the electromagnetic directional valve 17, an oil inlet of a second pressure reducing valve 15 is connected with one end of the second shuttle valve 16, and the pressure oil after pressure reduction flows into the.
As shown in fig. 1, the structure of the right suspension control valve group is the same as that of the left suspension control valve group, and the detailed description is omitted here.
The external oil port control valve group comprises an electromagnetic directional valve 29. An oil inlet of the electromagnetic directional valve 29 is connected with a first oil inlet P1 of the integrated valve group, and an oil outlet of the electromagnetic directional valve 29 is connected with a sixth oil outlet A3.
The winch control valve group comprises an electromagnetic directional valve 31, an oil inlet of the electromagnetic directional valve 31 is connected with a first oil inlet P1, and two oil outlets of the electromagnetic directional valve 31 are respectively connected with a seventh oil outlet A4 and an eighth oil outlet B4. And the seventh oil outlet a4 and the eighth oil outlet B4 are connected with a winch device.
Two oil inlets of the seventh shuttle valve 32 are respectively connected with two oil outlets of the electromagnetic directional valve 31. A first oil inlet of the sixth shuttle valve 30 is connected with a sixth oil outlet a3, a second oil inlet of the sixth shuttle valve 30 is connected with an oil outlet of the seventh shuttle valve 32, an oil inlet of the fifth shuttle valve 28 is connected with an oil outlet of the sixth shuttle valve 30, another oil inlet is connected with an oil outlet of the fourth shuttle valve 24, hydraulic oil flowing out through the fifth shuttle valve 28 is connected with an oil inlet of the third shuttle valve 20, an oil outlet of the third shuttle valve 20 is connected with an oil inlet of the first shuttle valve 3, another oil inlet of the first shuttle valve 3 is connected with the first damper 5, the oil outlet of the first shuttle valve 3 is connected with the one-way damping valve 2, and pressure oil flowing out from the one-way damping valve 2 passes through the filter screen 1 and then is connected with a load pressure feedback port Ls of the integrated valve group.
In summary, in the manifold block of the present embodiment, the shuttle block, that is, the first shuttle valve 3, the second shuttle valve 16, the third shuttle valve 20, the fourth shuttle valve 24, the fifth shuttle valve 28, the sixth shuttle valve 30, and the seventh shuttle valve 32 selects the highest load pressure signal, and the pilot unloading valve 6 generates the load sensing signal pressure for the manifold block to match the output of the load-sensitive pump to meet the requirements of different hydraulic circuits, and the first damper 5 is disposed at the inlet of the pilot unloading valve 6, and when the pump is impacted or the pressure is suddenly increased, the pressure oil of the first oil inlet P1 flows into the lower end of the pilot unloading valve 6 through the first damper 5 and is communicated with the third oil return port T3, so as to reduce the pressure impact at the pump port and stabilize the hydraulic system. The highest pressure signal screened by the shuttle valve group reaches an oil outlet of the first shuttle valve 3, the right end of the one-way damping valve 2 is connected with the oil outlet of the first shuttle valve 3, the left end of the one-way damping valve 2 is connected with a load pressure feedback port through a filter screen 1, if the load pressure is gradually increased, the one-way damping valve 2 plays a role of a one-way valve, the one-way valve is opened to quickly feed back to the load sensitive pump, the discharge capacity of the load sensitive pump is adjusted, and the load sensitive pump can quickly follow the load response; when the load pressure is gradually reduced, the one-way damping valve 2 plays a damping role and slowly reduces the pressure received by a load feedback port of the load sensitive pump, so that the discharge capacity of the load sensitive pump is slowly reduced, the stability of the output pressure of the load sensitive pump is improved, and the stability of a hydraulic system is improved.
In the embodiment, the flow control valve 12 is arranged on the hydraulic loop leading to the first oil outlet PB, and can be manually opened or closed, when the engineering vehicle works normally, the flow control valve 12 is in an open state, at the moment, when the engineering vehicle releases parking brake, the two-position three-way electromagnetic valve 11 needs to be electrified to be reversed to the right position, hydraulic oil from the load sensitive pump enters from the first oil inlet P1, the first check valve 8 is opened through the second damper 7 to reach the oil inlet of the first reducing valve 9, the pressure oil reduced by the first reducing valve 9 reaches the oil outlet of the two-position three-way electromagnetic valve 11 through the third damper 10, and flows into the first oil outlet PB through the flow control valve 12 to reach the parking brake to release the parking brake, when the engineering vehicle needs to park brake, the two-position three-way electromagnetic valve 11 needs to be powered off to be reversed to the left position, the hydraulic oil from the load sensitive pump, and realizing parking braking. If electrical faults occur, the two-position three-way electromagnetic valve 11 cannot be powered on, the flow control valve 12 can be manually closed, hydraulic oil of the first oil outlet PB is cut off, then the oil outlet of the two-position three-way electromagnetic valve 11 flows back to the third oil return port T3 of the integrated valve group, pressure oil is supplied to the first oil outlet PB through the external manual control pump of the oil outlet pressure measuring port MPB, brake pressure is removed, and at the moment, a machine maintenance worker can pull a machine.
The integrated valve group of the embodiment further comprises an energy accumulator oil supply port AC, pressure oil from the first oil inlet P1 opens the check valve 8 through the damper 7 and directly flows into the energy accumulator oil supply port AC, and the energy accumulator oil supply port AC is connected with the driving brake hydraulic energy accumulator to complete the punching of the driving brake hydraulic energy accumulator. And the integrated valves of this embodiment still is provided with detection hydraulic fluid port SW, external brake pressure detection switch, and if the pressure that the braking pressure that traveles is less than the system setting will indicate the warning, increase the braking security that traveles, protection driver.
In the embodiment, the second oil outlet A1 and the fourth oil outlet B2 are connected with a rodless cavity of the front suspension oil cylinder, and the third oil outlet B1 and the fifth oil outlet A2 are connected with a rod cavity of the front suspension oil cylinder. When the front end of the engineering vehicle is lifted, the electromagnetic directional valve 17 is reversed to the left position of the working position, the second shuttle valve 16 and the fourth shuttle valve 24 compare the pressures of the rod cavity and the rodless cavity of the front suspension oil cylinder, and the highest pressure directly enters a shuttle valve loop and is fed back to a load pressure feedback port Ls of the integrated valve group. In addition, in the suspension control valve group of this embodiment, the relief valve 19 is disposed on the oil path of the third oil outlet B1, so that the front suspension cylinder maintains a fixed back pressure, after the pressure of the rod cavity of the front suspension cylinder exceeds the fixed back pressure, the relief valve 19 is opened, the second hydraulic check valve 18 is opened, and the pressure oil of the rod cavity of the front suspension cylinder flows back to the first oil return port T1 through the electromagnetic directional valve 17. When the pump is impacted or the pressure is suddenly increased, the inlet pressure of the second reducing valve 15 exceeds the set pressure, the second reducing valve 15 is opened to enable part of oil to flow back to the first oil return port T1, the whole control loop enables the rodless cavity and the rod cavity of the actuating oil cylinder to form a constant pressure difference through the second reducing valve 15 and the overflow valve 19, the front end of the engineering vehicle is enabled to rise at a controllable speed, and the stability, the driving safety and the comfort of a hydraulic system are improved.
When the front end of the engineering vehicle descends, the electromagnetic directional valve 17 is reversed to the right position of a working position, the second shuttle valve 16 and the fourth shuttle valve 24 compare the pressures of a rod cavity and a rodless cavity of the front suspension oil cylinder, the highest pressure directly enters a shuttle valve loop and is fed back to a load pressure feedback port Ls of the integrated valve group, pressure oil enters from a first oil inlet P1 and reaches an oil inlet of the electromagnetic directional valve 17, the second hydraulic control one-way valve 18 is opened, and the pressure oil flows into a third oil outlet B1 by opening a one-way valve structure contained in the overflow valve 19, so that the front suspension oil cylinder retracts; the first pilot-controlled check valve 14 is opened, so that the pressure oil in the rodless cavity of the front suspension oil cylinder flows into the oil return port of the electromagnetic directional valve 17 through the first pilot-controlled check valve 14 and opens the second check valve 13, and flows into the first oil return port T1.
When the electromagnetic directional valve 17 is switched from the working position to the middle position, the load feedback pressure in the pore passage of the integrated valve body flows back to the third oil return port T3 through the dynamic damping valve 4, so that oil trapping in a middle position load feedback oil passage is avoided, fluctuation of the load feedback pressure in the switching process is filtered, and the impact of the load feedback pressure is relieved. Meanwhile, the first hydraulic control one-way valve 14 and the second hydraulic control one-way valve 18 form interlocking, so that left and right cylinders of the front suspension are prevented from settling, the control posture of the engineering vehicle is kept, and the system safety is improved.
The integrated valve pack of the present embodiment further includes a sixth oil outlet a 3. The external control valve set comprises an electromagnetic directional valve 29. The electromagnetic directional valve 29 is reversed to the left position of the working position, the sixth shuttle valve 30 feeds back the load pressure to the load pressure feedback oil port through the shuttle valve group, the load sensitive pump pressure oil flows into the oil inlet of the electromagnetic directional valve 29 from the first oil inlet P1 and flows into the sixth oil outlet A3 through the inner hole of the valve body, if the engineering vehicle is provided with a suspension hydraulic system, the hydraulic oil pre-charging can be completed through the sixth oil outlet A3, or an oil cylinder or an accumulator charging valve arranged on the engineering vehicle breaks down, or the oil port sixth oil outlet A3 can be controlled by an external oil source to complete the liquid charging, the structure design is simple, the installation and the maintenance are convenient, and the cost is low.
The integrated valve block of the present embodiment further includes a seventh oil outlet a4 and an eighth oil outlet B4. The seventh oil outlet A4 and the eighth oil outlet B4 are externally connected with a winch device motor and integrated on the multifunctional valve bank, a control valve block does not need to be independently developed, and therefore the hydraulic valve bank is convenient for integrated installation of hydraulic pipelines, convenient to maintain and low in cost. The winch control valve block of the present embodiment includes a solenoid directional valve 31. The electromagnetic directional valve 31 is switched to a working position, the seventh shuttle valve 32 feeds back the load pressure to the load pressure feedback oil port, the load sensitive pump pressure oil flows into the oil inlet of the electromagnetic directional valve 31 from the first oil inlet P1, and flows into the seventh oil outlet A4 and the eighth oil outlet B4 through the inner hole of the integrated valve block body, and the control of the execution device is completed.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (10)
1. An integrated valve manifold, comprising:
an oil inlet;
at least two oil outlet groups configured to control different actuator actions and each said oil outlet group comprising at least one oil outlet;
the control valve groups are arranged corresponding to the oil outlet groups, and each control valve group is arranged between the oil inlet and the oil outlet group;
a load pressure feedback port; and
and the oil pressure comparison valve group is arranged between the at least two oil outlet groups and the load pressure feedback port, compares the oil outlet pressures of the at least two oil outlet groups and transmits the pressure of the oil outlet group with the highest oil outlet pressure in the at least two oil outlet groups to the load pressure feedback port.
2. The integrated valve manifold of claim 1 wherein the oil pressure comparison valve manifold comprises a shuttle valve manifold comprising at least two shuttle valves.
3. The integrated valve manifold of claim 2 wherein the at least two sets of oil outlets include a first set of oil outlets and a second set of oil outlets, the at least two shuttle valves include a first shuttle valve and a second shuttle valve, the oil outlet of the first shuttle valve is connected to the load pressure feedback port, the first oil inlet of the first shuttle valve is connected to the oil inlet, the second oil inlet of the first shuttle valve is connected to the oil outlet of the second shuttle valve, the first oil inlet of the second shuttle valve is connected to the first set of oil outlets, and the second oil inlet of the second shuttle valve is connected to the second set of oil outlets.
4. The integrated valve group of claim 3, wherein the first group of oil outlets comprises two oil outlets, the second group of oil outlets comprises one oil outlet, the at least two shuttle valves further comprise a third shuttle valve, two oil inlets of the third shuttle valve are respectively connected with the two oil outlets of the first group of oil outlets, the oil outlet of the third shuttle valve is connected with the first oil inlet of the second shuttle valve, and the second oil inlet of the second shuttle valve is connected with one oil outlet of the second group of oil outlets.
5. The integrated valve pack of claim 1, further comprising a one-way damper valve disposed between the oil pressure comparison valve pack and the load pressure feedback port; and/or, the integrated valve group further comprises a filtering device arranged between the oil pressure comparison valve group and the load feedback port.
6. The integrated valve manifold of claim 1, further comprising a dynamic damper valve disposed between the load pressure feedback port and the return port.
7. The integrated valve manifold of any one of claims 1 to 6 wherein the at least two groups of oil outlets comprise a brake control group of oil outlets, a suspension control group of oil outlets, an external group of oil outlets, and a winch control group of oil outlets.
8. The integrated valve manifold of claim 7 wherein the set of suspension control ports comprises a first outlet port connected to a rodless chamber of a suspension cylinder and a second outlet port connected to a rod chamber of a suspension cylinder, the at least two sets of control valves comprise a set of suspension control valves comprising an overflow valve connected to the second outlet port and a check valve connected in parallel with the overflow valve.
9. The integrated valve manifold of claim 7 wherein the set of brake control ports comprises a brake control port and the at least two sets of control valves comprise a set of brake control ports comprising a flow control valve connected to the brake control port.
10. A hydraulic system comprising an integrated valve pack as claimed in any one of claims 1 to 9.
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|---|---|---|---|
| CN201911283469.XA CN110873086A (en) | 2019-12-13 | 2019-12-13 | Integrated valve group and hydraulic system |
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| CN201911283469.XA CN110873086A (en) | 2019-12-13 | 2019-12-13 | Integrated valve group and hydraulic system |
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| CN110873086A true CN110873086A (en) | 2020-03-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114252255A (en) * | 2021-11-24 | 2022-03-29 | 沈阳航天新光集团有限公司 | Integrated valve comprehensive test system and test method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114252255A (en) * | 2021-11-24 | 2022-03-29 | 沈阳航天新光集团有限公司 | Integrated valve comprehensive test system and test method |
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