CN113931894A - Load-sensitive multi-way valve with independently controlled load port and hydraulic system - Google Patents
Load-sensitive multi-way valve with independently controlled load port and hydraulic system Download PDFInfo
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- CN113931894A CN113931894A CN202111145002.6A CN202111145002A CN113931894A CN 113931894 A CN113931894 A CN 113931894A CN 202111145002 A CN202111145002 A CN 202111145002A CN 113931894 A CN113931894 A CN 113931894A
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- 239000003381 stabilizer Substances 0.000 claims description 9
- 239000003921 oil Substances 0.000 description 337
- 238000005516 engineering process Methods 0.000 description 15
- 239000010720 hydraulic oil Substances 0.000 description 14
- 230000001276 controlling effect Effects 0.000 description 8
- 238000006073 displacement reaction Methods 0.000 description 7
- 230000007246 mechanism Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 238000003754 machining Methods 0.000 description 4
- 230000007935 neutral effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000010923 batch production Methods 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
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- 230000001681 protective effect Effects 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
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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
- F15B13/021—Valves for interconnecting the fluid chambers of an actuator
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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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor 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
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/026—Pressure compensating valves
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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
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
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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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/08—Servomotor systems incorporating electrically operated control means
- F15B21/087—Control strategy, e.g. with block diagram
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention discloses a load-sensitive multi-way valve with independently controlled load ports and a hydraulic system, wherein the load-sensitive multi-way valve with independently controlled load ports comprises an oil inlet connection, at least one working connection, an oil inlet way, an oil return way and a load feedback way, wherein the oil inlet way, the oil return way and the load feedback way are communicated with the oil inlet connection and each working connection, the working connection comprises a reversing control valve core, an oil return control valve core and a pressure compensation valve, a first working oil way is connected with a first load port, a second working oil way is connected with a second load port, the first working oil way and the second working oil way are respectively connected with the oil inlet way through the pressure compensation valve and the reversing control valve core, a feedback oil port of the pressure compensation valve is connected with the load feedback way, and the first working oil way and the second working oil way are connected with an oil return oil way through an oil return control valve core by feeding back a load pressure signal, the reversing control valve core control cavity is connected with the oil inlet proportional control valve, and the oil return control valve core control cavity is connected with the oil return proportional control valve. The design is simple, the structure is compact, the precision requirement is low, and the anti-flow saturation function is realized.
Description
Technical Field
The invention relates to a hydraulic multi-way valve, in particular to a load-sensitive multi-way valve with independently controlled load ports. In addition, the hydraulic system is provided with the load-sensitive multi-way valve with the load ports controlled independently.
Background
The multi-way valve is an integrated valve formed by combining a plurality of single-connection reversing valves and a plurality of auxiliary valves such as a safety overflow valve, a one-way valve and the like, has a compact structure, and is widely applied to mobile machinery.
The traditional load sensitive multi-way valve adopts a main valve core to control the flow direction of pressure oil, acts on an actuating mechanism connected to a load port of the main valve core, and realizes the change of the direction of the actuating mechanism by reversing control of the valve core. Because the main valve core is adopted for control, the oil inlet channel and the oil return channel are controlled by the same valve core, the opening displacement of the throttling groove is in linkage in the same direction, and the flow area is increased or reduced simultaneously. In order to achieve matching of oil inlet and oil return, different oil inlet and oil return throttling grooves are designed according to different working conditions and different flow rates to meet requirements, even auxiliary elements such as a balance valve, a one-way throttling valve and a back pressure valve are required to be added in a system to increase oil return backpressure, otherwise, a main engine is easy to operate unstably and even stalled, but numerous additional valves are added in the system, so that energy consumption and cost of the main engine are greatly increased.
Therefore, an oil inlet and oil return separate control technology is provided, and the problems encountered by the traditional multi-way valve can be well solved. The existing load port independent control double-spool multi-way valve mainly comprises a main valve body, two main valve spool components, a pilot reversing valve assembly, a signal acquisition part and the like, wherein a pressure sensor and a temperature sensor are embedded in the main valve body and used for acquiring pressure signals and temperature change signals, a displacement sensor is integrated on the main valve spool and the like and used for acquiring spool displacement signals, and the displacement of the main valve spool can be respectively controlled by controlling the strength and the mode of input signals of the pilot reversing valve assembly, so that the pressure and the flow required by the system are controlled, and the problems of the traditional multi-way valve are solved.
However, the flow and pressure requirements of the load port independently controlled multi-way valve are compared and analyzed through data collected by the pressure sensor, the flow sensor and the displacement sensor, and the flow and pressure required by the system are output through program operation, so that the system debugging and control difficulty is greatly increased; due to the integration of a plurality of sensors, the requirements of manufacturing, installing, controlling precision and the like of the valve body and the valve core are greatly increased.
Disclosure of Invention
The invention aims to solve the technical problem of providing a load-sensitive multi-way valve with an independently controlled load port, which has the advantages of simple design, compact structure, convenient control, stable and reliable performance, relatively low requirements on part matching precision and machining precision and flow saturation resistance.
The invention further aims to solve the technical problem of providing a hydraulic system, wherein the load-sensitive multi-way valve with the load port independently controlled is simple in design, compact in structure, convenient to control, stable and reliable in performance, relatively low in requirements on part matching precision and machining precision, and has the function of resisting flow saturation.
In order to solve the technical problems, the invention provides a load-sensitive multi-way valve with independently controlled load ports, which comprises an oil inlet link, at least one working link, an oil inlet path communicated with the oil inlet link and each working link, an oil return path communicated with the oil inlet link and each working link, and a load feedback path communicated with the oil inlet link and each working link, wherein the working link comprises a reversing control valve core, an oil return control valve core, a pressure compensation valve, a first working oil path connected with a first load port and a second working oil path connected with a second load port, the first working oil path and the second working oil path are respectively connected with the reversing control valve core through the pressure compensation valve, the oil inlet path is connected with the pressure compensation valve through the reversing control valve core, and a feedback oil port of the pressure compensation valve is connected with the load feedback oil path, the first working oil way and the second working oil way are respectively connected with the oil return oil way through the oil return control valve core, the control cavity of the reversing control valve core is connected with an oil inlet proportional control valve, and the control cavity of the oil return control valve core is connected with an oil return proportional control valve.
Optionally, the oil-feeding proportional control valve and the oil-returning proportional control valve are proportional reversing valves, two end control cavities of the reversing control valve core are connected with the pilot oil path through the corresponding oil-feeding proportional control valves, and two end control cavities of the oil-returning control valve core are connected with the pilot oil path through the corresponding oil-returning proportional control valves.
Optionally, the oil inlet union comprises a pressure reduction overflow valve, and the oil inlet oil way is connected with the pilot oil way through the pressure reduction overflow valve.
Optionally, the oil inlet union includes a three-way pressure compensation valve, the three-way pressure compensation valve is located on an oil path between the oil inlet path and the oil return path, and a spring control cavity of the three-way pressure compensation valve is connected with the load feedback oil path.
Optionally, the oil feeding system further comprises oil drainage oil paths communicated with the oil feeding systems and the work systems, and the oil feeding systems comprise flow stabilizers located on oil paths between the load feedback oil paths and the oil drainage oil paths.
Optionally, the oil inlet union comprises an LS safety valve located on an oil path between the load feedback oil path and the oil drainage oil path.
Optionally, an oil return port of the oil inlet proportional control valve and an oil return port of the oil return proportional control valve are both connected with the oil drainage oil path.
Optionally, the oil inlet union comprises a main overflow valve located on an oil path between the oil inlet oil path and the oil return oil path.
Optionally, the first working oil path and the second working oil path are both connected to an overload oil replenishing valve.
The invention also provides a hydraulic system, which comprises the load-sensitive multi-way valve with the load ports independently controlled in any one of the technical schemes.
Through the technical scheme, the invention has the following beneficial effects:
the invention integrates the traditional load sensing technology, the load port independent control technology and the proportional control technology, and the reversing control valve core and the oil return control valve core are independently arranged, so that oil inlet and oil return of a working mechanism can be independently regulated, and the motion logic of the reversing control valve core and the oil return control valve core can be controlled by controlling the action sequence and the pressure of the oil inlet proportional control valve and the oil return proportional control valve, so that various combinations are obtained, and the requirements of different working conditions are met. Moreover, the pressure compensation valve is arranged behind the reversing control valve core, and when a plurality of work coupling compound actions exist, the pressure compensation valve can have a flow saturation resisting function.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
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 specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a hydraulic schematic diagram of a load-sensitive multi-way valve with independently controlled load ports according to a first embodiment of the present invention;
FIG. 2 is a hydraulic schematic diagram of a load-sensitive multi-way valve with independently controlled load ports according to a second embodiment of the present invention;
fig. 3 is a hydraulic schematic diagram of a load-sensitive multi-way valve with independently controlled load ports according to a third embodiment of the present invention.
Description of the reference numerals
1 reversing control valve core 11 oil inlet proportional control valve
2 oil return control valve core 21 oil return proportion control valve
3 first working oil passage of pressure compensating valve 51
52 second working fluid passage 61 relief valve
62 three-way pressure compensating valve 63 flow stabilizer
8 overload oil supplementing valve 100 oil inlet path
101 oil return oil path 102 load feedback oil path
103 pilot oil passage 104 oil drainage oil passage
A a first load port and B a second load port
C1 feedback port P oil inlet
X-guide-port Y-oil drainage port
LS load feedback oil port T oil return port
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
Furthermore, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, and therefore the features defined "first", "second" may explicitly or implicitly include one or more of the features described.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; either directly or indirectly through intervening media, either internally or in any combination thereof. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
It should be noted that the load-sensitive multi-way valve with independently controlled load ports of the present invention belongs to the hydraulic field, and for those skilled in the art, the substantial technical idea thereof lies in the hydraulic connection relationship. The related hydraulic components, such as the directional control valve, the pressure compensating valve, the relief valve, the hydraulic pump, etc., are well known to those skilled in the art and are common components in existing hydraulic systems, and therefore, they will be described only briefly below. After knowing the technical concept of the present invention, those skilled in the art can also simply replace the oil path or the valve, etc. to implement the function of the load-sensitive multi-way valve with independently controlled load ports of the present invention, which also belongs to the protection scope of the present invention.
In the load-sensitive multi-way valve with independently controlled load ports, the functions of all the working units are basically the same, so that the following description mainly takes one working unit as an example. Of course, in the specific embodiment, the structures of the work units may be the same or different, and the specific number of the work units may be set as required, all of which belong to the protection scope of the present invention.
Referring to fig. 1, the load-sensitive multi-way valve with independently controlled load ports according to the basic technical scheme of the present invention comprises an oil inlet pair, at least one working pair, an oil inlet path 100 communicating the oil inlet pair with each working pair, an oil return path 101 communicating the oil inlet pair with each working pair, and a load feedback path 102 communicating the oil inlet pair with each working pair, wherein the working pair comprises a directional control valve core 1, an oil return control valve core 2, a pressure compensation valve 3, a first working oil path 51 connected with a first load port a, and a second working oil path 52 connected with a second load port B, the first working oil path 51 and the second working oil path 52 are respectively connected with the directional control valve core 1 through a pressure compensation valve 3, the oil inlet path 100 is connected with the pressure compensation valve 3 through the directional control valve core 1, a feedback path C1 of the pressure compensation valve 3 is connected with the load feedback path 102 so as to feed back a load pressure signal of the first load port a or the second load port B, the first working oil path 51 and the second working oil path 52 are respectively connected with the oil return path 101 through the oil return control valve core 2, the control cavity of the reversing control valve core 1 is connected with the oil inlet proportional control valve 11, and the control cavity of the oil return control valve core 2 is connected with the oil return proportional control valve 21.
In the technical scheme, the reversing control valve core 1 and the oil control valve core 2 are independently arranged, the control cavity of the reversing control valve core 1 is connected with the oil inlet proportional control valve 11, and the control cavity of the oil return control valve core 2 is connected with the oil return proportional control valve 21, so that oil inlet and oil return of a working mechanism can be independently regulated, and the motion logics of the reversing control valve core 1 and the oil control valve core 2 can be controlled by controlling the action sequence and the pressure of the oil inlet proportional control valve 11 and the oil return proportional control valve 21 to obtain various combinations so as to meet the requirements of different working conditions. Compared with the prior art that a sensor is arranged on a main valve body of the load port independent control double-valve-core multi-way valve to collect pressure signals, temperature change signals and valve core displacement signals, the load port independent control double-valve-core multi-way valve has the advantages of simple design, compact structure, convenient control, stable and reliable performance, more energy conservation and high efficiency; the feedback oil port C1 of the pressure compensation valve 3 is connected with the load feedback oil path 102, so that the pressure of the load port can be fed back, the pressure compensation valve 3 is used for compensating the system pressure, the front and back pressure difference of the throttling port of the reversing control valve core 1 is equal, the flow entering the first load port A or the second load port B is only related to the opening of the throttling port and is unrelated to the load, the multi-way valve has a load sensing function, and the pressure compensation valve 3 is arranged behind the reversing control valve core 1 and has a flow saturation resistance function; the traditional load sensitive technology adopted has relatively low requirements on the matching precision and the machining precision of parts, has stronger pollution resistance, better maintainability and lower manufacturing cost, and is easier to realize batch production. The load-sensitive multi-way valve with the independently controlled load port integrates the traditional load-sensitive technology, the load port independent control technology and the proportional control technology.
As a specific embodiment, the overload oil supply valve 8 may be provided in the working connection, the first working oil path 51 and the second working oil path 52 may be connected to one overload oil supply valve 8, respectively, and oil may be supplied to the first working oil path 51 or the second working oil path 52 as needed, or one overload oil supply valve 8 may be connected to each of the first working oil path 51 and the second working oil path 52, and oil may be supplied to the first working oil path 51 or the second working oil path 52 as needed by reversing operation.
In an optimal case, the oil inlet proportional control valve 11 and the oil return proportional control valve 21 may adopt proportional reversing valves, such as electric proportional reversing valves, so that the load-sensitive multi-way valve with independently controlled load ports of the present invention integrates the traditional load-sensitive technology, the load-port independent control technology and the electric proportional control technology. In the load sensitive multi-way valve with independently controlled load ports, a pilot oil path 103 is arranged, and the pilot oil path 103 is communicated with an oil inlet link and a working link and an adjacent working link. As a preferred embodiment, the control cavities at two ends of the reversing control valve core 1 are respectively connected with an oil inlet proportional control valve 11, the oil inlet proportional control valve 11 is installed on an oil path between the control cavity of the reversing control valve core 1 and the pilot oil path 103, the control cavities at two ends of the oil return control valve core 2 are respectively connected with an oil return proportional control valve 21, and the oil return proportional control valve 21 is installed on an oil path between the control cavity of the oil return control valve core 2 and the pilot oil path 103.
Further, the oil inlet unit includes a pressure reducing overflow valve 61, the pressure reducing overflow valve 61 is disposed on the oil path between the oil inlet path 100 and the pilot oil path 103, and can reduce the oil pressure of a part of the hydraulic oil flowing into the oil inlet path 100, and supply pilot oil to the control cavity of the reversing control valve element 1 through the oil inlet proportional control valve 11 to control the movement of the reversing control valve element 1, or supply pilot oil to the control cavity of the oil return control valve element 2 through the oil return proportional control valve 21 to control the movement of the oil return control valve element 2.
In a specific embodiment, the oil inlet coupling further includes a three-way pressure compensating valve 62, the three-way pressure compensating valve 62 is located on an oil path between the oil inlet path 100 and the oil return path 101, and a spring control chamber of the three-way pressure compensating valve 62 is connected to the load feedback oil path 102. When the system is in the neutral position, namely the reversing control valve core 1 in the working connection is in the neutral position, at this time, if the three-way pressure compensation valve 62 does not exist, the oil inlet oil path 100 still continuously provides hydraulic oil for the reversing control valve core 1, and the system pressure is increased; however, due to the three-way pressure compensation valve 62, the spring control cavity of the three-way pressure compensation valve 62 senses the highest pressure transmitted by the load feedback oil path 102 to adjust the opening of the valve core orifice, so as to unload the hydraulic oil in the oil inlet oil path 100, and maintain a constant differential pressure when the system is at the middle position.
As a specific embodiment, in the load-sensitive multi-way valve with independently controlled load ports, an oil drainage oil path 104 is further arranged, and the oil drainage oil path 104 is communicated with the oil inlet connection and the working connection and the adjacent working connection. The oil inlet joint is also internally provided with a flow stabilizer 63, the flow stabilizer 63 is positioned on an oil path between the load feedback oil path 102 and the oil drainage oil path 104, and the flow stabilizer 63 provides neutral unloading for the load feedback oil path 102 to maintain the stability of the pressure and the flow of hydraulic oil going to the control three-way pressure compensation valve 62 or the hydraulic pump.
Specifically, an LS safety valve 64 is further arranged in the oil inlet joint, and the LS safety valve 64 is located on an oil path between the load feedback oil path 102 and the oil drainage oil path 104 and connected in parallel with the flow stabilizer 63. Further, still be provided with main overflow valve 65 in the oil feed antithetical couplet, main overflow valve 65 is located the oil circuit between oil feed oil circuit 100 and the oil return oil circuit 101 to guarantee system pressure stability.
In order to better understand the technical solution of the present invention, preferred embodiments are described below with reference to relatively full technical features.
Referring to fig. 1, the load-sensitive multi-way valve with independently controlled load ports according to the preferred embodiment of the present invention includes an oil inlet link, at least one working link, an oil inlet path 100, an oil return path 101, a load feedback path 102, a pilot path 103, and an oil drainage path 104, where the oil inlet path 100 communicates the oil inlet link with the adjacent working link and the working link with the adjacent working link, the oil return path 101 communicates the oil inlet link with the adjacent working link and the working link with the adjacent working link, the load feedback path 102 communicates the oil inlet link with the adjacent working link and the working link with the adjacent working link, the pilot path 103 communicates the oil inlet link with the adjacent working link and the working link with the adjacent working link, and the oil drainage path 104 communicates the oil inlet link with the adjacent working link and the working link with the adjacent working link. The working combination comprises a reversing control valve core 1, an oil return control valve core 2, a pressure compensation valve 3, a first load port A, a first working oil path 51, a second load port B and a second working oil path 52, wherein the first load port A is connected with the first working oil path 51, the second load port B is connected with the second working oil path 52, the first working oil path 51 and the second working oil path 52 are respectively connected with the reversing control valve core 1 through the pressure compensation valve 3, the reversing control valve core 1 is arranged on an oil path between the pressure compensation valve 3 and the oil inlet path 100, a feedback oil port C1 of the pressure compensation valve 3 is connected with a load feedback oil path 102, control chambers at two ends of the reversing control valve core 1 are respectively connected with an oil inlet proportional control valve 11, hydraulic oil is input to corresponding control chambers of the reversing control valve core 1 through the oil inlet proportional control valve 11 to control the movement of the reversing control valve core 1, so that the oil inlet path 100 supplies oil to the first working oil path 51 or the second working oil path 52, meanwhile, the first working oil path 51 and the second working oil path 52 are respectively connected with the oil return path 101 through the oil return control valve core 2, two control cavities of the oil return control valve core 2 are respectively connected with the oil return proportional control valve 21, hydraulic oil is input to the corresponding control cavity of the oil return control valve core 2 through the oil return proportional control valve 21, and the oil return control valve core 2 is controlled to move, so that the hydraulic oil in the second working oil path 52 or the first working oil path 51 flows back into the oil return path 101. Therefore, the motion logics of the reversing control valve core 1 and the oil return control valve core 2 can be controlled to obtain various combinations so as to meet the requirements of different working conditions; in the working connection, the first working oil path 51 and the second working oil path 52 are respectively connected with an overload oil replenishing valve 8, and oil is replenished to the first working oil path 51 or the second working oil path 52 according to needs. The oil inlet coupling comprises a pressure reducing overflow valve 61, a three-way pressure compensating valve 62, a flow stabilizer 63, an LS safety valve 64 and a main overflow valve 65, a load feedback oil path 102 is used for feeding back the highest pressure of LS hydraulic oil of different working couplings to the variable displacement pump, the pressure reducing overflow valve 61 is positioned on an oil path between the oil inlet oil path and a pilot oil path 103 and is used for reducing the pressure of the hydraulic oil and providing pilot oil to the reversing control valve core 1 and the oil return control valve core 2 through the pilot oil path 103, the three-way pressure compensating valve 62 is positioned on an oil path between the oil inlet oil path 100 and the oil return oil path 101, a spring control cavity of the three-way pressure compensating valve 62 is connected with the load feedback oil path 102, the highest pressure transmitted by the load feedback oil path 102 is sensed to adjust the opening of a valve core throttle orifice of the three-way pressure compensating valve 62, the hydraulic oil is unloaded, the constant differential pressure of the system in the middle position is kept, the flow stabilizer 63 is positioned on an oil path between the load feedback oil path 102 and the oil drainage oil path 104, the LS relief valve 64 is positioned on an oil path between the load feedback oil path 102 and the oil drainage oil path 104, and the main overflow valve 65 is positioned on an oil path between the oil inlet oil path 100 and the oil return oil path 101. The oil inlet path 100 is connected with an oil inlet P of the load-sensitive multi-way valve independently controlled by the load port of the invention, the oil return path 101 is connected with an oil return port T of the load-sensitive multi-way valve independently controlled by the load port of the invention, the load feedback path 102 is connected with a load feedback oil port LS of the load-sensitive multi-way valve independently controlled by the load port of the invention, the pilot oil path 103 is connected with a pilot port X of the load-sensitive multi-way valve independently controlled by the load port of the invention, and the oil drain path 104 is connected with an oil drain port Y of the load-sensitive multi-way valve independently controlled by the load port of the invention.
When the oil inlet proportional control valve 11 connected with the control cavity at the lower end of the reversing control valve core 1 works, pilot oil enters the lower end of the reversing control valve core 1 and pushes the pilot oil to overcome the spring force of the upper end, so that hydraulic oil in an oil inlet P enters a first load port A through a throttle port at the lower end of the reversing control valve core 1 and a pressure compensation valve core 3, and the pressure of the first load port A is transmitted to a spring cavity of the three-way pressure compensation valve 62 through a feedback oil duct at the lower end in the reversing control valve core 1 and a feedback oil port C1 of the pressure compensation valve core 3 to control the opening of the three-way pressure compensation valve core or is transmitted to a variable pump through a load feedback oil port LS to control the swing angle of the variable pump; similarly, when the oil inlet proportional control valve 11 connected with the control cavity at the upper end of the reversing control valve core 1 works, pilot oil enters the upper end of the reversing control valve core 1 to push the pilot oil to overcome the spring force at the lower end, so that the hydraulic oil with the P port enters the second load port B through the throttling port at the upper end of the reversing control valve core 1 and the pressure compensation valve core 3, and the pressure of the second load port B is transmitted to the spring cavity of the three-way pressure compensation valve 62 through the feedback oil duct at the upper end in the reversing control valve core 1 and the feedback oil port C1 of the pressure compensation valve core 3 to control the opening of the three-way pressure compensation valve core or transmitted to the variable pump through the load feedback oil port LS to control the swing angle of the variable pump, so that the load sensitive multi-way valve with the independently controlled load ports has the function of independently controlling the reversing control valve core and has the load sensing function. Furthermore, the pressure compensating spool 3 is disposed behind the direction change control spool 1, and has a function of resisting flow saturation when there are a plurality of work combinations.
When an oil return proportional control valve connected with a control cavity at the lower end of the oil return control valve core 2 works 21, pilot oil enters the lower end of the oil return control valve core 2 and pushes the pilot oil to overcome the spring force of the upper end, so that hydraulic oil at the second load port B returns to the oil return port T through a throttling port of the oil return control valve core 2; when the oil return proportional control valve connected with the control cavity at the upper end of the oil return control valve core 2 works 21, pilot oil enters the upper end of the oil return control valve core 2 and pushes the pilot oil to overcome the spring force of the lower end, so that the hydraulic oil of the first load port A returns to the oil return port T through the throttling port of the oil return control valve core 2, and the load sensitive multi-way valve with the independently controlled load ports has the function of independently controlling the oil return control valve core.
The load-sensitive multi-way valve with the independently controlled load ports has the advantages that the reversing and resetting of the reversing control valve core 1 and the reversing and resetting of the oil return control valve core 2 are independently controlled, so that the load-sensitive multi-way valve can be programmed according to needs, and various combinations can be obtained by performing different controls on the working logics of the two valve cores so as to meet the requirements of different working conditions. For example, fig. 2 shows an embodiment in which the first load port a and the second load port B are respectively connected to a rod cavity and a rodless cavity of an oil cylinder (or a motor), and the opening sizes of the reversing and throttling grooves in different directions of the reversing control valve core 1 and the oil return control valve core 2 are realized by combining and controlling the oil inlet proportional control valve 11 and the oil return proportional control valve 21, and each load port is independently controlled to meet the requirements of the system for different speeds, back pressures and the like. Fig. 3 shows an embodiment in which the first load port a and the second load port B are respectively connected to a single acting cylinder, when the reversing control valve core 1 is controlled to move downward by the oil inlet proportional control valve 11, the working oil drives a single acting cylinder to work, and when the oil inlet proportional control valve 11 is not powered and does not work, the reversing control valve core 1 returns to the neutral position, and the single acting cylinder is locked at a certain position; when the oil return control valve core 2 is controlled to move downwards by the oil return proportion control valve 21, the first load port A is communicated with the oil return port T, and the single-action oil cylinder is reset to realize the independent control of the first load port A. Similarly, when the oil inlet proportional control valve 11 controls the reversing control valve core 1 to move upwards, the working oil drives another single-acting oil cylinder to work, when the oil inlet proportional control valve 11 is powered off and does not work, the reversing control valve core 1 returns to the middle position, and the single-acting oil cylinder is locked at a certain position; when the oil return control valve core 2 is controlled to move upwards through the oil return proportion control valve 21, the first load port A is communicated with the oil return port T, and the single-action oil cylinder is reset, so that the independent control of the second load port B is realized.
The invention integrates the traditional load sensing technology, the load port independent control technology and the electric proportional control technology, adopts the independent arrangement of the reversing control valve core 1 and the oil return control valve core 2, leads the oil inlet and the oil return of the working mechanism to be independently adjusted, by controlling the sequence of actions and the pressure of the oil inlet proportional control valve 11 and the oil return proportional control valve 21, the motion logics of the reversing control valve core 1 and the oil return control valve core 2 can be controlled to obtain various combinations, compared with the existing load port independent control double-valve-element multi-way valve, the double-valve-element multi-way valve has the advantages of simple technical design, compact structure, convenience in control, stable and reliable performance, energy conservation and high efficiency, the adopted traditional load sensitive technology has relatively low requirements on the matching precision and the machining precision of parts, the pollution resistance is higher, the maintainability is better, the manufacturing cost is low, and the batch production is easier to realize.
The hydraulic system of the invention comprises the load-sensitive multi-way valve with the independently controlled load port according to any one of the above technical schemes, so that the hydraulic system at least has all the advantages brought by the technical scheme of the embodiment of the load-sensitive multi-way valve with the independently controlled load port.
The load sensitive multi-way valve with the independently controlled load ports can be applied to various engineering machines needing the multi-way valve, such as cranes, excavators and the like.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. The invention is not described in detail in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (10)
1. A load-sensitive multi-way valve with independently controlled load ports is characterized by comprising an oil inlet connector, at least one working connector, an oil inlet oil path (100) communicated with the oil inlet connector and each working connector, an oil return path (101) communicated with the oil inlet connector and each working connector, and a load feedback oil path (102) communicated with the oil inlet connector and each working connector, wherein the working connector comprises a reversing control valve core (1), an oil return control valve core (2), a pressure compensation valve (3), a first working oil path (51) connected with a first load port (A) and a second working oil path (52) connected with a second load port (B), the first working oil path (51) and the second working oil path (52) are respectively connected with the reversing control valve core (1) through the pressure compensation valve (3), the oil inlet path (100) is connected with the pressure compensation valve (3) through the reversing control valve core (1), the pressure compensation valve (3) is characterized in that a feedback oil port (C1) is connected with a load feedback oil path (102) to feed back a load pressure signal of the first load port (A) or the second load port (B), the first working oil path (51) and the second working oil path (52) are respectively connected with an oil return path (101) through an oil return control valve core (2), a control cavity of the reversing control valve core (1) is connected with an oil inlet proportional control valve (11), and a control cavity of the oil return control valve core (2) is connected with an oil return proportional control valve (21).
2. The load-sensitive multi-way valve with independently controlled load ports according to claim 1, further comprising a pilot oil way (103) communicating the oil inlet connection with each working connection, wherein the oil inlet proportional control valve (11) and the oil return proportional control valve (21) are both proportional directional valves, control cavities at two ends of the reversing control valve core (1) are respectively connected with the pilot oil way (103) through the corresponding oil inlet proportional control valve (11), and control cavities at two ends of the oil return control valve core (2) are respectively connected with the pilot oil way (103) through the corresponding oil return proportional control valve (21).
3. The load-port-independently-controlled load-sensitive multi-way valve according to claim 2, wherein the oil inlet joint comprises a pressure-reducing overflow valve (61), and the oil inlet path (100) is connected with the pilot oil path (103) through the pressure-reducing overflow valve (61).
4. The load-port independently controlled load-sensitive multi-way valve according to claim 1, wherein the oil inlet manifold comprises a three-way pressure compensating valve (62), the three-way pressure compensating valve (62) is located on an oil path between the oil inlet path (100) and the oil return path (101), and a spring control chamber of the three-way pressure compensating valve (62) is connected with the load feedback path (102).
5. The load port independently controlled load sensitive multiplex valve according to any one of claims 1 to 4 further comprising a drain circuit (104) communicating said oil feed connection with each of said working connections, said oil feed connection comprising a flow stabilizer (63) on the circuit between said load feedback circuit (102) and said drain circuit (104).
6. The load port independently controlled load sensitive multiplex valve of claim 5, wherein said oil intake manifold includes an LS relief valve (64) located on an oil path between said load feedback oil path (102) and said drain oil path (104).
7. The load-sensitive multi-way valve with independently controlled load ports as claimed in claim 5, wherein the oil return port of the oil inlet proportional control valve (11) and the oil return port of the oil return proportional control valve (21) are both connected with the oil drainage path (104).
8. The load port independently controlled load sensitive multi-way valve according to any one of claims 1 to 4, wherein the oil inlet manifold comprises a primary spill valve (65) on the oil path between the oil inlet path (100) and the oil return path (101).
9. The load port independently controlled load sensitive multiple-way valve according to any one of claims 1 to 4, characterized in that the first working oil circuit (51) and the second working oil circuit (52) are both connected with an overload make-up valve (8).
10. A hydraulic system comprising a load-sensitive multi-way valve with independently controlled load ports according to any one of claims 1 to 9.
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| CN202111145002.6A CN113931894A (en) | 2021-09-28 | 2021-09-28 | Load-sensitive multi-way valve with independently controlled load port and hydraulic system |
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| CN202111145002.6A CN113931894A (en) | 2021-09-28 | 2021-09-28 | Load-sensitive multi-way valve with independently controlled load port and hydraulic system |
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| CN108412829A (en) * | 2018-04-09 | 2018-08-17 | 徐州燕大传动与控制技术有限公司 | A kind of separately adjustable load-sensitive formula multi-way valve of inlet and outlet throttling side energy |
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| CN201187492Y (en) * | 2008-04-01 | 2009-01-28 | 常德信诚液压有限公司 | Anti-flow saturation combined proportional operating valve |
| CN102587443A (en) * | 2012-02-23 | 2012-07-18 | 上海三一重机有限公司 | Multiway valve hydraulic control system of crawler excavator |
| CN102927071A (en) * | 2012-11-14 | 2013-02-13 | 中煤科工集团重庆研究院 | Hydraulic anti-jamming control system for drill loader |
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Effective date of registration: 20220711 Address after: 415001 No. 321, Deshan Avenue, Deshan economic development zone, Changde City, Hunan Province Applicant after: CHANGDE ZHONGLIAN ZHONGKE HYDRAULIC Co.,Ltd. Address before: 410013 No. 361 South silver basin, Changsha, Hunan, Yuelu District Applicant before: ZOOMLION HEAVY INDUSTRY SCIENCE&TECHNOLOGY Co.,Ltd. |
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Application publication date: 20220114 |