CN108194441B - Multi-way valve tail connection and electro-hydraulic proportional multi-way valve - Google Patents
Multi-way valve tail connection and electro-hydraulic proportional multi-way valve Download PDFInfo
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- CN108194441B CN108194441B CN201711455380.8A CN201711455380A CN108194441B CN 108194441 B CN108194441 B CN 108194441B CN 201711455380 A CN201711455380 A CN 201711455380A CN 108194441 B CN108194441 B CN 108194441B
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- 230000008878 coupling Effects 0.000 claims description 15
- 238000010168 coupling process Methods 0.000 claims description 15
- 238000005859 coupling reaction Methods 0.000 claims description 15
- 239000011148 porous material Substances 0.000 claims description 12
- 238000004891 communication Methods 0.000 claims description 7
- 238000012545 processing Methods 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 338
- 230000009467 reduction Effects 0.000 description 7
- 230000009471 action Effects 0.000 description 6
- 238000011161 development Methods 0.000 description 6
- 230000007246 mechanism Effects 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 2
- 230000006837 decompression Effects 0.000 description 2
- 239000010720 hydraulic oil Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 239000010729 system oil Substances 0.000 description 1
Classifications
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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
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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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- Fluid-Pressure Circuits (AREA)
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- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The invention relates to a multiway valve tail connection and an electrohydraulic proportional multiway valve, wherein the multiway valve tail connection comprises a valve body (5), a load-sensitive feedback oil port (13) and an oil return port (11) are arranged on the valve body (5), and the load-sensitive feedback oil port (13) is selectively communicated with the oil return port (11). The valve body in the tail-end embodiment of the multi-way valve is provided with the load-sensitive feedback oil port and the oil return port, the load-sensitive feedback oil port and the oil return port are selectively communicated, and when the load-sensitive feedback oil port and the oil return port are communicated, the function of unloading a load feedback oil way can be realized, so that the unloading function of the load feedback oil way is integrated on the tail-end, the structure of other joints of the multi-way valve where the tail-end is positioned is beneficial to simplifying, the arrangement of other joints of control oil ways is more convenient, and the processing difficulty is reduced.
Description
Technical Field
The invention relates to the technical field of multi-way valves, in particular to a multi-way valve tail connection and an electrohydraulic proportional multi-way valve.
Background
At present, the load-sensitive multi-way valve is widely applied to various engineering machinery, the valve can realize the compound action of a plurality of actuating mechanisms in the working process, and when the flow of a hydraulic pump reaches saturation, the action of each linkage actuating mechanism is not influenced by load and is in proportion to the opening degree of a valve core of a main valve, so that the flow required by different loads can be effectively regulated, and the stability of the action of the whole machine is ensured.
The sheet type load sensitive multi-way valve is generally formed by combining a certain number of reversing valve units, comprises an oil inlet unit, a working unit and a tail unit, integrates a reversing valve, a one-way valve, an overflow valve and an oil supplementing valve into a whole, and has the control modes of manual control, hydraulic pilot control and electric proportional control. The hydraulic pilot control multi-way valve needs to provide an external pilot oil source in the system, and the main valve core is pushed to generate displacement by controlling pilot pressure, so that the opening of the main valve core is controlled, and the working joint flow distribution is realized; the electric proportional control multi-way valve converts analog or digital signals into continuous flow or pressure in the hydraulic system in proportion to control the main valve core to generate displacement, and can realize proportional control of oil flow and pressure by using control signals, thereby simplifying the system, realizing remote control and automatic control and improving the stability of the system.
At present, a load-sensitive multiway valve generally adopts a constant-difference overflow valve and a pressure compensation valve to realize simultaneous actions of a plurality of execution mechanisms of the multiway valve, the highest load pressure of each execution mechanism is transmitted to a spring side of an oil inlet link and one side of the pressure compensation valve through a shuttle valve, the pressure of a working link with lower load is compensated by the pressure compensation valve, so that the front-back pressure difference of a main valve core is kept consistent, an anti-saturation function is realized, namely when the flow reaches saturation, the pressure difference of each main valve core is kept consistent, the flow is ensured to be in proportion to the opening of the main valve core, the influence of the load is less in a certain range, and a tail link is generally only provided with an oil inlet, an oil outlet, an integrated LS overflow valve and an LS flow control valve, so that the functions of leading in and leading out the flow of a hydraulic pump, reducing LS oil path impact and the like are realized, and the realization function is less, and the structure is simple.
At present, most engineering machinery vehicles adopt a multi-way valve controlled manually or by hydraulic pilot control to be matched with a constant displacement pump or a variable displacement pump system, but the control mode has the problems that operators are hard to operate, the control precision is poor, each execution action is difficult to coordinate and stably control, the working stability of the system and the automation degree are greatly influenced by the multi-way valve, and therefore, the adoption of the electric proportional multi-way valve becomes the future application trend of various engineering machinery. However, when the manual or hydraulic pilot control multi-way valve is developed, matched dies, clamps and cutters are put into the process, if the original manual or hydraulic pilot control multi-way valve and matched various tools are completely abandoned, the electro-hydraulic proportional multi-way valve is re-developed, so that great waste is caused, and the development period and the development cost are difficult to ensure.
It should be noted that the information disclosed in the background section of the present invention is only for increasing the understanding of the general background of the present invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide a multiway valve tail connector and an electrohydraulic proportional multiway valve, so that the multiway valve tail connector has the function of unloading a load feedback oil way.
In order to achieve the purpose, the invention provides a multiway valve tail connector, which comprises a valve body, wherein a load-sensitive feedback oil port and an oil return port are arranged on the valve body, and the load-sensitive feedback oil port and the oil return port are selectively communicated.
Further, the tail connection further comprises a switch valve, and the switch valve is connected between the load sensitive feedback oil port and the oil return port.
Further, the tail coupling further comprises a pressure reducing valve, a main oil inlet, an inner pilot oil supply port and an inner pilot oil drain port are further arranged on the valve body, the oil inlet of the pressure reducing valve is communicated with the main oil inlet, the oil outlet of the pressure reducing valve is communicated with the inner pilot oil supply port, the inner pilot oil supply port is used for providing pilot control oil for the working coupling in the load-sensitive multi-way valve, the inner pilot oil drain port is communicated with the oil return port, and the inner pilot oil drain port is used for releasing pilot control oil in the working coupling.
Further, the internal pilot oil supply port comprises a first internal oil supply port and a second internal oil supply port, and the first internal oil supply port and the second internal oil supply port are respectively communicated with pilot control oil inlets at two ends of the main valve core in the working unit.
Further, the internal pilot oil drain port comprises a first internal oil drain port and a second internal oil drain port, and the first internal oil drain port and the second internal oil drain port are respectively communicated with pilot control oil drain ports at two ends of the main valve core in the working unit.
Further, the tail link also comprises an oil filter, and the oil filter is connected with an oil outlet of the pressure reducing valve.
Further, a pressure measuring port is further formed in the valve body and is connected with a communication oil path between the pressure reducing valve and the internal pilot oil supply port.
Further, an external pilot oil drain port is further arranged on the valve body, and the external pilot oil drain port is communicated with the oil return port.
Further, the tail connection further comprises an overflow valve, and the overflow valve is connected between the load sensitive feedback oil port and the oil return port.
Further, the tail is connected still includes overflow valve and ooff valve, and the bottom of valve body is the plane, and when the valve body was placed in the forward direction, overflow valve and ooff valve were installed respectively in the top left side of valve body and are arranged from top to bottom, and the relief pressure valve is installed in the top right side of valve body and the level is arranged.
Further, a first channel group is arranged in the valve body, and the first channel group enables a load sensitive feedback oil port to be communicated with an oil inlet of the switch valve and an oil inlet of the overflow valve on a first vertically arranged functional plane of the valve body.
Further, a second channel group is arranged in the valve body, and the second channel group enables the main oil inlet to be communicated with the pressure reducing valve oil inlet on a second function plane which is vertically arranged on the valve body.
Further, a pressure measuring port is further formed in the valve body, a third channel group is arranged in the valve body, and the third channel group enables an oil outlet of the pressure reducing valve to be communicated with the internal pilot oil supply port and the pressure measuring port on a third functional plane horizontally arranged on the valve body.
Further, an external pilot oil drain port is further formed in the valve body, a fourth channel group is arranged in the valve body, and the fourth channel group enables the internal pilot oil drain port to be communicated with the oil return port and the external pilot oil drain port on a fourth function plane which is vertically arranged on the valve body.
Further, a fifth channel group is arranged in the valve body, and the fifth channel group enables an oil outlet of the pressure reducing valve and an oil outlet of the switching valve to be communicated with the oil return port on a fifth functional plane horizontally arranged on the valve body and a sixth functional plane vertically arranged on the valve body.
Further, the internal pilot oil supply port comprises a first internal oil supply port and a second internal oil supply port, the internal pilot oil drain port comprises a first internal oil drain port and a second internal oil drain port, the first internal oil supply port and the first internal oil drain port are both arranged on the left side of the front side surface of the valve body, and a pore channel in which the first internal oil supply port is arranged and the pore channel in which the first internal oil drain port is arranged are different in length from front to back so as to be communicated with different channels; and/or the second internal oil supply port and the second internal oil drain port are arranged on the right side of the front side surface of the valve body, and the pore canal where the second internal oil supply port is positioned and the pore canal where the second internal oil drain port is positioned are arranged front and back and have different lengths so as to be communicated with different channels.
In order to achieve the purpose, the invention also provides an electro-hydraulic proportional multi-way valve, which comprises the multi-way valve tail.
Further, the electro-hydraulic proportional multi-way valve further comprises a working link, a main valve core is arranged in the working link, an inner pilot oil supply port of the tail link is communicated with pilot oil inlets at two ends of the main valve core so as to provide pilot oil for controlling movement of the main valve core to the working link through the tail link, an inner pilot oil drain port of the tail link is communicated with pilot oil drain ports at two ends of the main valve core so as to realize pilot oil drain through the tail link, and oil inlet quantity of the main oil inlet of the multi-way valve is controlled through electric proportion so as to enable the main valve core to realize electro-hydraulic proportional control.
Based on the technical scheme, the valve body in the tail-end embodiment of the multi-way valve is provided with the load-sensitive feedback oil port and the oil return port, the load-sensitive feedback oil port and the oil return port are selectively communicated, and when the load-sensitive feedback oil port and the oil return port are communicated, the function of unloading a load feedback oil path can be realized, so that the unloading function of the load feedback oil path is integrated on the tail-end, the structure of other joints of the multi-way valve where the tail-end is positioned is facilitated to be simplified, the arrangement of control oil paths of other joints is more convenient, and the processing difficulty is reduced.
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 embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:
FIG. 1 is a schematic diagram of one embodiment of a multiway valve tail of the present invention.
Fig. 2 is a cross-sectional view of a first functional plane of one embodiment of a multiway valve tail of the present invention.
Fig. 3 is a cross-sectional view of a third functional plane of one embodiment of a multiway valve tail of the present invention.
Fig. 4 is a cross-sectional view of a fourth functional plane of one embodiment of a multiway valve tail of the present invention.
FIG. 5 is a top view of one embodiment of a multiway valve tail of the present invention.
In the figure:
1. an overflow valve; 2. a switch valve; 3. a pressure reducing valve; 4. an oil filter; 5. a valve body; 6. a main oil inlet; 7. a first internal oil supply port; 8. a second internal oil supply port; 9. a first internal drain port; 10. a second internal drain port; 11. an oil return port; 12. an external pilot oil drain port; 13. a load sensitive feedback oil port; 14. a pressure measuring port; 15. a threaded section; 16. an oil return cavity; 17. an oil outlet of the pressure reducing valve; 18. an oil inlet of the pressure reducing valve; 19. an oil drain port of the pressure reducing valve;
21. a first channel; 22. a second channel; 23. a third channel; 24. a fourth channel; 25. a fifth channel; 26. a sixth channel; 27. a seventh channel; 28. an eighth channel; 29. a ninth channel; 30. a tenth channel; 31. an eleventh channel; 32. a twelfth channel; 33. a thirteenth channel; 34. a fourteenth channel; 35. a fifteenth channel; 36. a sixteenth channel; 37. seventeenth channel; 38. an eighteenth channel; 39. nineteenth channel; 41. a first clamping plate position; 42. a second clamping plate position; 43. and a third clamping plate position.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the terms "center," "lateral," "longitudinal," "front," "rear," "left," "right," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the scope of the present invention.
Referring to fig. 1 to 5, in an exemplary embodiment of the multiway valve tail provided by the present invention, the multiway valve tail includes a valve body 5, and a load-sensitive feedback oil port 13 and an oil return port 11 are disposed on the valve body 5, where the load-sensitive feedback oil port 13 is selectively communicated with the oil return port 11.
In the above-mentioned exemplary embodiment, the valve body 5 is provided with the load-sensitive feedback oil port 13 and the oil return port 11, and the load-sensitive feedback oil port 13 and the oil return port 11 are selectively communicated, so that when the load-sensitive feedback oil port 13 and the oil return port 11 are communicated, the function of unloading the load-sensitive feedback oil path can be realized, the unloading function of the load-sensitive feedback oil path is integrated on the tail link, the structure of other links of the multi-way valve where the tail link is positioned is facilitated to be simplified, the arrangement of control oil paths of other links is also more convenient, and the processing difficulty is reduced.
Further, the tail further comprises a switch valve 2, and the switch valve 2 is connected between the load sensitive feedback oil port 13 and the oil return port 11. By arranging the switch valve 2, the purpose of selectively communicating the load sensitive feedback oil port 13 with the oil return port 11 can be realized. When the switch valve 2 is switched on, the load sensitive feedback oil port 13 is communicated with the oil return port 11, so that unloading of a load feedback oil way is realized; when the switch valve 2 is powered off, the load sensitive feedback oil port 13 is disconnected with the oil return port 11, and the load sensitive feedback oil port 13 can build pressure to realize a load sensitive control function.
Optionally, the tail coupling further comprises a pressure reducing valve 3, the valve body 5 is further provided with a main oil inlet 6, an inner pilot oil supply port and an inner pilot oil drain port, the oil inlet of the pressure reducing valve 3 is communicated with the main oil inlet 6, the oil outlet of the pressure reducing valve 3 is communicated with the inner pilot oil supply port, the inner pilot oil supply port is used for providing pilot control oil for the working coupling in the load-sensitive multi-way valve, the inner pilot oil drain port is communicated with the oil return port 11, and the inner pilot oil drain port is used for releasing pilot control oil in the working coupling.
The pressure reducing valve 3 is arranged on the tail joint, so that pilot control oil meeting the pressure requirement of the pilot control oil after pressure reduction can be conveyed to the working joint through the internal pilot oil supply port, and the main valve core in the working joint can realize electric proportional control through the matching of the pressure reducing valve and the magnitude of an input current signal, thereby improving the control precision of a hydraulic system and reducing the operation intensity of an operator; the hydraulic pilot control system can also use the work combination for the hydraulic pilot control for the work combination for the electric proportional control, so that the waste of parts is reduced, and the development cost is saved.
Through setting up relief pressure valve 3, inside guide oil feed port and inside guide oil drain port, make the multiway valve tail connect integrated electric proportion control, inside guide oil feed, inside guide oil drain and load feedback oil circuit one key off-load a plurality of functions, simplify the hydraulic system oil circuit, make the compound action of each actuating mechanism of complete machine more coherent.
Optionally, the internal pilot oil supply port comprises a first internal oil supply port 7 and a second internal oil supply port 8, and the first internal oil supply port 7 and the second internal oil supply port 8 are respectively communicated with pilot control oil inlets at two ends of the main valve core in the working coupling.
Optionally, two ends of the working link are provided with electric proportional cartridge valves, and the electric proportional cartridge valves are used for controlling on-off between the internal pilot oil supply port and the pilot oil inlet of the main valve core.
Correspondingly, the inner pilot oil drain comprises a first inner oil drain 9 and a second inner oil drain 10, and the first inner oil drain 9 and the second inner oil drain 10 are respectively communicated with pilot control oil drains at two ends of the main valve core in the working coupling.
Optionally, the tail further comprises an oil filter 4, the oil filter 4 being connected to the outlet of the relief valve 3. By providing the oil filter 4, impurities in the oil can be filtered, and the oil passage can be prevented from being blocked.
Optionally, the valve body 5 is further provided with a pressure measuring port 14, and the pressure measuring port 14 is connected with a communication oil path between the pressure reducing valve 3 and the internal pilot oil supply port. By arranging the pressure measuring port 14, the pressure of the communication oil way between the pressure reducing valve 3 and the internal pilot oil supply port can be detected in real time, so that a reference is provided for the pressure relief element, and the damage to the oil way due to the overhigh oil pressure is prevented.
Optionally, an external pilot oil drain port 12 is further provided on the valve body 5, and the external pilot oil drain port 12 is communicated with the oil return port 11. By providing the external pilot drain port 12, a drain path can be increased, and the pressure release speed can be increased.
Optionally, the tail coupling further comprises a relief valve 1, and the relief valve 1 is connected between the load sensitive feedback oil port 13 and the oil return port 11. By arranging the overflow valve 1, the problems of damage and the like caused by high pressure of an oil way can be prevented.
The arrangement of the various elements on the valve body 5 and the various oil passages in the valve body 5 will be described below. The arrangement mode to be described below can realize a plurality of functions of the tail connection described above on the premise of not changing the structural form of the tail connection valve body of the original multi-way valve for hydraulic pilot control, and the positions of clamping plates for clamping the clamp, which are arranged on the original structure, are not required to be changed, and as shown in fig. 4, the tail connection valve body comprises three clamping plate positions, namely a first clamping plate position 41, a second clamping plate position 42 and a third clamping plate position 43, so that the original clamp and cutter can not be replaced, waste is reduced, and development period and development cost are saved.
As shown in fig. 2, with the direction of illustration as the reference direction, the bottom of the valve body 5 is a plane, and when the valve body 5 is placed in the forward direction, the relief valve 1 and the on-off valve 2 are respectively installed on the top left side of the valve body 5 and arranged up and down, and the pressure reducing valve 3 is installed on the top right side of the valve body 5 and arranged horizontally.
Optionally, as shown in fig. 2, a first channel group is provided in the valve body 5, and the first channel group communicates the load-sensitive feedback oil port 13 with the oil inlet of the on-off valve 2 and the oil inlet of the overflow valve 1 on a first vertically arranged functional plane of the valve body 5.
Specifically, the first functional plane extends along the left-right direction of the valve body 5, the first channel group includes a first channel 21, a second channel 22 and a third channel 23, the first channel 21 is communicated with a channel where the load-sensitive feedback oil port 13 is located, one end of the second channel 22 is communicated with the first channel 21, the other end of the second channel 22 is communicated with an oil inlet of the switch valve 2, and the third channel 23 is communicated with the second channel 22 and with an oil inlet of the overflow valve 1.
Wherein the first channel 21 and the third channel 23 are arranged horizontally and the second channel 22 is arranged vertically. The first and third passages 21 and 23 extend horizontally rightward from the left side surface of the valve body 5, and the ports of the first and third passages 21 and 23 at the left side surface of the valve body 5 are blocked.
Optionally, as shown in fig. 2, a second channel group is provided in the valve body 5, which communicates the main oil inlet 6 with the relief valve oil inlet 18 on a vertically arranged second functional plane of the valve body 5.
Specifically, the second functional plane extends in the left-right direction of the valve body 5, the second channel group includes a fourth channel 24, a fifth channel 25 and a sixth channel 26, the fourth channel 24 communicates with a duct in which the main oil inlet 6 is located, the fifth channel 25 is connected with the fourth channel 24 and communicates with the relief valve oil inlet 18, and the sixth channel 26 communicates with the fifth channel 25.
Wherein the fourth channel 24 and the sixth channel 26 are arranged vertically, and the fifth channel 25 is arranged horizontally and below the pressure reducing valve 3. The fourth passage 24 and the sixth passage 26 extend vertically upward from the bottom surface of the valve body 5, and the ports of the fourth passage 24 and the sixth passage 26 at the bottom surface of the valve body 5 are blocked. The fifth passage 25 extends horizontally from the right side face of the valve body 5 to the left, and the port of the fifth passage 25 at the right side face of the valve body 5 is blocked. In practice, only the portion of the sixth passage 26 located above the fifth passage 25 has a communicating meaning, but in order to facilitate the opening of the duct, the sixth passage 26 extends upward from the bottom surface of the valve body 5.
Optionally, as shown in fig. 3, a third channel group is provided in the valve body 5, and the third channel group communicates the relief valve oil outlet 17 with the internal pilot oil supply port and the pressure measurement port 14 on a third functional plane horizontally provided in the valve body 5.
Specifically, the third functional plane extends in the left-right direction of the valve body 5, the internal pilot oil supply port includes a first internal oil supply port 7 and a second internal oil supply port 8, the third passage group includes a seventh passage 27, an eighth passage 28, a ninth passage 29, and a tenth passage 30, the seventh passage 27 communicates with the relief valve oil outlet 17, the eighth passage 28 communicates with the seventh passage 27, the first internal oil supply port 7 communicates with the eighth passage 28 through the ninth passage 29, and the second internal oil supply port 8 communicates with the eighth passage 28 through the tenth passage 30. The hole channel of the pressure measuring port 14 on the valve body 5 is communicated with the ninth channel 29.
The first internal oil supply port 7 is arranged on the left side of the front side surface of the valve body 5, and the pore canal where the first internal oil supply port 7 is arranged in front and back; the second internal oil supply port 8 is arranged on the right side of the front side surface of the valve body 5, and the pore canal where the second internal oil supply port 8 is arranged in front and back.
The seventh passage 27, the ninth passage 29, and the tenth passage 30 are provided left and right on the lateral cross section of the valve body 5, the seventh passage 27 is provided on the left side of the pressure reducing valve 3, and the eighth passage 28 is provided back and forth on the lateral cross section of the valve body 5. One end of the seventh passage 27 communicates with the oil outlet of the pressure reducing valve 3, and the other end communicates with the eighth passage 28, the seventh passage 27 extending horizontally in the left-right direction of the valve body 5. The eighth passage 28 extends horizontally rearward from the front side of the valve body 5, and the port of the eighth passage 28 on the front side of the valve body 5 is blocked. The ninth passage 29 extends horizontally from the left side face of the valve body 5 to the right, and the port of the ninth passage 29 on the left side face of the valve body 5 is blocked. The tenth passage 30 extends horizontally from the right side face of the valve body 5 to the left, and the port of the tenth passage 30 on the right side face of the valve body 5 is blocked. The pressure-measuring port 14 extends horizontally forward from the rear side of the valve body 5 to communicate with the ninth passage 29.
Optionally, as shown in fig. 4, an external pilot drain port 12 is further provided on the valve body 5, and a fourth channel group is provided in the valve body 5, where the fourth channel group communicates the internal pilot drain port with the oil return port 11 and the external pilot drain port 12 on a fourth function plane vertically provided on the valve body 5.
Specifically, the fourth functional plane extends in the left-right direction of the valve body 5, the internal pilot drain port includes a first internal drain port 9 and a second internal drain port 10, the fourth passage group includes an eleventh passage 31, a twelfth passage 32, a thirteenth passage 33, a fourteenth passage 34, a fifteenth passage 35, and an oil return chamber 16, a duct where the first internal drain port 9 is located communicates with the eleventh passage 31, the eleventh passage 31 communicates with the twelfth passage 32, the twelfth passage 32 communicates with the thirteenth passage 33, the thirteenth passage 33 communicates with the oil return chamber 16 through the fourteenth passage 34, the oil return chamber 16 communicates with a duct where the oil return port 11 is located, a duct where the second internal drain port 10 is located communicates with the fifteenth passage 35, and the fifteenth passage 35 communicates with the thirteenth passage 33. The relief valve drain port 19 is also communicated with the thirteenth passage 33 so that the relief valve drain port 19 communicates with the return oil chamber 16 and the return oil port 11.
Wherein the twelfth, fourteenth and fifteenth passages 32, 34 and 35 are all vertically disposed, the eleventh and thirteenth passages 31 and 33 are horizontally disposed and the eleventh passage 31 passes through the fourteenth passage 34 to communicate the first internal drain port 9 located at the left side of the valve body 5 with the second internal drain port 10 located at the right side of the valve body 5.
The eleventh passage 31 extends horizontally rightward from the left side surface of the valve body 5, and the port of the eleventh passage 31 on the left side surface of the valve body 5 is blocked. The twelfth passageway 32 extends vertically downward from the top surface of the valve body 5, and the port of the twelfth passageway 32 on the top surface of the valve body 5 is blocked. The thirteenth passage 33 penetrates the left and right sides of the valve body 5, and ports of the thirteenth passage 33 on both the left and right sides of the valve body 5 are blocked. The duct in which the external pilot drain port 12 is located extends vertically downwards from the top surface of the valve body 5 and is communicated with the fourteenth channel 34, and the fourteenth channel 34 extends vertically downwards after being communicated with the duct in which the external pilot drain port 12 is located and is communicated with the oil return cavity 16, and the oil return cavity 16 is communicated with the oil return port 11. The installation area of the oil return chamber 16 should be as large as possible within the allowable range to increase the oil storage amount. The fifteenth channel 35 extends vertically.
Optionally, a threaded section 15 is disposed at one end of the fourteenth channel 34 near the oil return cavity 16, and an oil plug is disposed outside the threaded section 15 to prevent oil leakage. The upper end of the thread section 15 is provided with a limiting end face so as to facilitate the installation of the oil plug.
Optionally, as shown in fig. 5, a fifth channel group is provided in the valve body 5, and the fifth channel group communicates both the oil outlet of the pressure reducing valve 3 and the oil outlet of the switching valve 2 with the oil return port 11 on a fifth functional plane horizontally disposed on the valve body 5 and a sixth functional plane vertically disposed on the valve body 5.
Specifically, the fifth functional plane extends horizontally in the front-rear direction of the valve body 5, the sixth functional plane extends vertically in the left-right direction of the valve body 5, and the fifth passage group includes a sixteenth passage 36, a seventeenth passage 37, an eighteenth passage 38, and a nineteenth passage 39, the sixteenth passage 36 communicates with the oil outlet of the relief valve 1, the sixteenth passage 36 communicates with the oil return chamber 16 through the seventeenth passage 37, the eighteenth passage 38 communicates with the oil outlet of the on-off valve 2, and the eighteenth passage 38 communicates with the oil return chamber 16 through the nineteenth passage 39.
Of these, the sixteenth passage 36 and the eighteenth passage 38 are each arranged back and forth, and the seventeenth passage 37 and the nineteenth passage 39 are each arranged vertically. The sixteenth passage 36 and the eighteenth passage 38 each extend horizontally forward from the rear side of the valve body 5, and the ports of the sixteenth passage 36 and the eighteenth passage 38 on the rear side of the valve body 5 are blocked. The seventeenth passage 37 and the nineteenth passage 39 each extend vertically downward from the top surface of the valve body 5, and the ports of the seventeenth passage 37 and the nineteenth passage 39 on the top surface of the valve body 5 are sealed.
Optionally, the internal pilot oil supply port includes a first internal oil supply port 7 and a second internal oil supply port 8, the internal pilot oil drain port includes a first internal oil drain port 9 and a second internal oil drain port 10, the first internal oil supply port 7 and the first internal oil drain port 9 are both disposed on the left side of the front side surface of the valve body 5, and the duct in which the first internal oil supply port 7 is disposed and the duct in which the first internal oil drain port 9 is disposed are both front and rear and have different lengths so as to communicate with different channels. The second internal oil supply port 8 and the second internal oil drain port 10 are both arranged on the right side of the front side surface of the valve body 5, and the pore canal where the second internal oil supply port 8 is located and the pore canal where the second internal oil drain port 10 is located are both arranged front and back and have different lengths so as to be communicated with different channels.
In the arrangement structure, each channel in each channel group is approximately arranged on the corresponding functional plane, so that communication among the channels can be facilitated, channel arrangement is simplified, and the difficulty in opening each channel is reduced. What is meant here by being arranged substantially on the corresponding functional plane is that each channel of each channel group can be cut off when cutting the valve body 5 along the corresponding functional plane, without requiring that the central axis of each channel fall on the corresponding functional plane.
Based on the multiway valve tail, the invention further provides an electrohydraulic proportional multiway valve, and the electrohydraulic proportional multiway valve comprises the multiway valve tail.
Further, the electro-hydraulic proportional multi-way valve further comprises a working link, a main valve core is arranged in the working link, an inner pilot oil supply port of the tail link is communicated with pilot oil inlets at two ends of the main valve core so as to provide pilot oil for controlling movement of the main valve core to the working link through the tail link, an inner pilot oil drain port of the tail link is communicated with pilot oil drain ports at two ends of the main valve core so as to realize pilot oil drain through the tail link, and oil inlet quantity of the main oil inlet of the multi-way valve is controlled through electric proportion so as to enable the main valve core to realize electro-hydraulic proportional control.
The multi-way valve tail connection and the electro-hydraulic proportional multi-way valve in each embodiment can be applied to engineering machinery such as underground excavation trolleys, graders and the like.
The positive technical effects of the tail coupling of the multi-way valve in the above embodiments are also applicable to electro-hydraulic proportional multi-way valves, and are not described herein.
The working process of one embodiment of the multiway valve tail link and the electrohydraulic proportional multiway valve of the invention is described below with reference to the accompanying figures 1 to 5:
as shown in fig. 1, the multi-way valve tail joint integrates the overflow valve 1, the switching valve 2, the pressure reducing valve 3 and the oil filter 4 into a valve body 5 of the tail joint, and the tail joint is provided with a main oil inlet P, a load sensitive feedback oil port Ls, an oil return port T, a first inner oil supply port Va, a second inner oil supply port Vb, a pressure measuring port V, a first inner oil drain port La, a second inner oil drain port Lb and an outer pilot oil drain port L. Hydraulic oil output in proportion through control current magnitude enters the pressure reducing valve 3 through the main oil inlet P, enters the internal pilot oil supply channel after pressure reduction of the pressure reducing valve 3 and filtration of the oil filter 4, is communicated with pilot control oil inlets at two ends of a main valve core of a working link through a first internal oil supply port Va and a second internal oil supply port Vb, and is connected with a first internal oil drain port La and a second internal oil drain port Lb of a tail link, and the first internal oil drain port La and the second internal oil drain port Lb are communicated with an oil return port T and an external pilot oil drain port L through the internal pilot oil supply channel. The functions of electric proportional control decompression, internal pilot oil supply, internal pilot oil drainage, load feedback oil way one-key unloading and the like are all integrated into the tail link, so that the purpose of applying the oil inlet link and the working link for the hydraulic pilot control multi-way valve to electric proportional control is realized, and the aim of directly upgrading the hydraulic pilot control multi-way valve to the electric proportional control multi-way valve is realized by changing the tail link component.
As shown in fig. 2, a plurality of channels are arranged in the valve body 5 for realizing the functions of electric proportional control oil supply and decompression, internal pilot oil supply, internal pilot oil drainage and one-key unloading of a load feedback oil way. In the sectional view shown in fig. 2, the oil supply and pressure reduction function introduces hydraulic oil of the main oil inlet 6 into the pressure reduction valve oil inlet 18 through a fourth passage 24, a fifth passage 25 and a sixth passage 26 on the right side inside the valve body 5, and high-pressure oil is reduced into pilot oil after entering the pressure reduction valve oil inlet 18, thereby realizing oil supply and pressure reduction.
The load feedback oil way one-key unloading function is realized by arranging a switch valve 2 in a valve body 5, as shown in fig. 1, the switch valve 2 is in a normally-on state when not powered, ls pressure signal oil is connected with an oil return port T, ls is not pressurized, and the electric proportional multi-way valve is in a neutral unloading state; when the switch valve 2 is electrified, ls oil is disconnected with the oil return port T, and Ls can build pressure to realize a load sensitive function. As shown in fig. 2, a first channel 21, a second channel 22 and a third channel 23 are arranged on the left side in the valve body 5, and the load-sensitive feedback oil port 13 is communicated with an oil inlet of the switch valve 2; as shown in fig. 5, the oil outlet of the overflow valve 1 is communicated with the oil return cavity 16 and the oil return port 11 through a sixteenth channel 36 and a seventeenth channel 37, the oil outlet of the switch valve 2 is communicated with the oil return cavity 16 and the oil return port 11 through an eighteenth channel 38 and a nineteenth channel 39, the communication between the oil outlet of the oil outlet switch valve 2 of the overflow valve 1 and the oil return port 11 is realized, and a one-key unloading function is realized.
In the internal pilot oil supply passage cross-sectional view shown in fig. 3, the pilot oil output from the pressure reducing valve 3 is introduced into the first and second internal oil supply ports 7 and 8 by providing the seventh, eighth, ninth, and tenth passages 27, 28, 29, and 30 in the valve body 5, thereby realizing an internal pilot oil supply function. The ninth passage 29 is provided behind the relief valve 1 and the on-off valve 2 and is not in line with the tenth passage 30, and can avoid the relief valve 1 and the on-off valve 2.
In the section view of the internal pilot oil drain channel shown in fig. 4, pilot control oil at two ends of a main valve core in a working unit is introduced into an oil return cavity 16 through a first internal oil drain port 9 and a second internal oil drain port 10, through an eleventh channel 31, a twelfth channel 32, a thirteenth channel 33, a fourteenth channel 34 and a fifteenth channel 35 in a valve body 5, and enters an oil return port 11 of the valve body 5, so that the internal pilot oil drain is realized; meanwhile, an oil drain port 19 of the pressure reducing valve is communicated with the oil return cavity 16, so that oil drain at the control end of the pressure reducing valve 3 is realized. Wherein the depth of the channel where the first internal oil supply port 7 is located is smaller than the depth of the channel where the first internal oil drain port 9 is located, and the eleventh channel 31 intersects the channel where the first internal oil drain port 9 is located, but does not intersect the channel where the first internal oil supply port 7 is located; the second internal oil supply port 8 has a smaller depth than the second internal oil drain port 10, and the fifteenth passage 35 intersects the second internal oil drain port 10 but does not intersect the second internal oil supply port 8.
The multi-way valve tail connection also has an external pilot oil drainage function, the lower end of the fourteenth channel 34 is provided with a thread section 15, an oil plug is added at the thread section 15, and the pilot oil drainage can flow out from the external pilot oil drainage port 12.
By way of illustration of various embodiments of the multiple valve tail and electro-hydraulic proportional multiple valve of the present invention, it can be seen that the multiple valve tail and electro-hydraulic proportional multiple valve embodiments of the present invention have at least one or more of the following advantages:
1. the unloading function of the load feedback oil circuit is integrated on the tail link, which is beneficial to simplifying the structures of other links of the multi-way valve where the tail link is positioned, so that the arrangement of the control oil circuit of the other links is more convenient, and the processing difficulty is reduced;
2. the multi-way valve tail joint is integrated with the functions of electric proportional control pressure reduction, internal pilot oil supply and internal pilot oil drainage by arranging the pressure reducing valve, the internal pilot oil supply port and the internal pilot oil drainage port, so that the arrangement of oil paths of other joints is further simplified;
3. on the basis of the original multiway valve tail for hydraulic pilot control, through reasonable arrangement and design of an internal oil duct, the tail can be used for electrohydraulic proportional control multiway valves, electrohydraulic proportional control can simplify an oil way of a hydraulic system, lighten the operation intensity of an operator, improve the control precision of the hydraulic system, and the original clamp and clamp plate positions do not need to be replaced, so that the investment of tools such as clamps and tools is saved, and the development period and cost of the electrohydraulic proportional multiway valve are saved.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same; while the invention has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that: modifications may be made to the specific embodiments of the present invention or equivalents may be substituted for part of the technical features thereof; without departing from the spirit of the invention, it is intended to cover the scope of the invention as claimed.
Claims (17)
1. The multi-way valve tail is characterized by comprising a valve body (5) and a switch valve (2), wherein a load-sensitive feedback oil port (13) and an oil return port (11) are arranged on the valve body (5), the load-sensitive feedback oil port (13) is selectively communicated with the oil return port (11), the switch valve (2) is connected between the load-sensitive feedback oil port (13) and the oil return port (11), and when the switch valve (2) is connected, the load-sensitive feedback oil port (13) is communicated with the oil return port (11) to realize unloading of a load feedback oil way; when the switching valve (2) is powered off, the load-sensitive feedback oil port (13) is disconnected with the oil return port (11), and the load-sensitive feedback oil port (13) establishes pressure to realize a load-sensitive control function.
2. The multi-way valve tail according to claim 1, further comprising a pressure reducing valve (3), wherein the valve body (5) is further provided with a main oil inlet (6), an internal pilot oil supply port and an internal pilot oil drain port, the oil inlet of the pressure reducing valve (3) is communicated with the main oil inlet (6), the oil outlet of the pressure reducing valve (3) is communicated with the internal pilot oil supply port, the internal pilot oil supply port is used for providing pilot control oil for a work unit in the load-sensitive multi-way valve, the internal pilot oil drain port is communicated with the oil return port (11), and the internal pilot oil drain port is used for decompressing pilot control oil in the work unit.
3. The multi-way valve tail coupling according to claim 2, wherein the internal pilot oil supply port comprises a first internal oil supply port (7) and a second internal oil supply port (8), and the first internal oil supply port (7) and the second internal oil supply port (8) are respectively communicated with pilot control oil inlets at two ends of a main valve core in the working coupling.
4. The multi-way valve tail coupling of claim 2, wherein the internal pilot drain comprises a first internal drain (9) and a second internal drain (10), the first internal drain (9) and the second internal drain (10) being in communication with pilot control drains at both ends of a main spool within the working coupling, respectively.
5. The multiplex valve tail according to claim 2, characterized in that the tail further comprises an oil filter (4), which oil filter (4) is connected to the outlet of the pressure reducing valve (3).
6. The multi-way valve tail according to claim 2, wherein the valve body (5) is further provided with a pressure measuring port (14), and the pressure measuring port (14) is connected with a communication oil path between the pressure reducing valve (3) and the internal pilot oil supply port.
7. The multiway valve tail according to claim 1, wherein an external pilot oil drain port (12) is further arranged on the valve body (5), and the external pilot oil drain port (12) is communicated with the oil return port (11).
8. The multi-way valve tail according to claim 1, further comprising an overflow valve (1), the overflow valve (1) being connected between a load sensitive feedback port (13) and an oil return port (11).
9. The multi-way valve tail according to claim 2, further comprising an overflow valve (1) and a switch valve (2), wherein the bottom of the valve body (5) is a plane, the overflow valve (1) and the switch valve (2) are respectively arranged on the left side of the top of the valve body (5) and up and down when the valve body (5) is placed forward, and the pressure reducing valve (3) is arranged on the right side of the top of the valve body (5) and horizontally.
10. The multiway valve tail according to claim 9, wherein a first channel group is arranged in the valve body (5), and the first channel group enables the load sensitive feedback oil port (13) to be communicated with the oil inlet of the switch valve (2) and the oil inlet of the overflow valve (1) on a first vertically arranged functional plane of the valve body (5).
11. The multiway valve tail according to claim 9, characterized in that a second channel group is arranged in the valve body (5), which communicates the main oil inlet (6) with the relief valve oil inlet (18) on a vertically arranged second functional plane of the valve body (5).
12. The multiway valve tail according to claim 9, characterized in that the valve body (5) is further provided with a pressure measuring port (14), a third channel group is arranged in the valve body (5), and the third channel group enables an oil outlet (17) of the pressure reducing valve to be communicated with the internal pilot oil supply port and the pressure measuring port (14) on a third functional plane horizontally arranged on the valve body (5).
13. The multiway valve tail according to claim 9, characterized in that an external pilot drain (12) is further arranged on the valve body (5), a fourth channel group is arranged in the valve body (5), and the fourth channel group enables the internal pilot drain to be communicated with the oil return port (11) and the external pilot drain (12) on a fourth vertically arranged functional plane of the valve body (5).
14. The multiway valve tail according to claim 9, characterized in that a fifth channel group is arranged in the valve body (5), and the fifth channel group enables the oil outlet of the pressure reducing valve (3) and the oil outlet of the switching valve (2) to be communicated with the oil return port (11) on a fifth horizontally arranged functional plane of the valve body (5) and a sixth vertically arranged functional plane of the valve body (5).
15. The multiway valve tail coupling according to claim 2, wherein the internal pilot oil supply port comprises a first internal oil supply port (7) and a second internal oil supply port (8), the internal pilot oil drain port comprises a first internal oil drain port (9) and a second internal oil drain port (10), the first internal oil supply port (7) and the first internal oil drain port (9) are both arranged on the left side of the front side surface of the valve body (5), and a pore channel in which the first internal oil supply port (7) is arranged and a pore channel in which the first internal oil drain port (9) is arranged are different in length from front to back so as to be communicated with different channels; and/or, the second internal oil supply port (8) and the second internal oil drain port (10) are both arranged on the right side of the front side surface of the valve body (5), and the pore channel where the second internal oil supply port (8) is located and the pore channel where the second internal oil drain port (10) is located are both arranged front and back and are different in length so as to be communicated with different channels.
16. An electrohydraulic proportional multi-way valve comprising a multi-way valve tail according to any one of claims 1 to 15.
17. The electro-hydraulic proportional multi-way valve according to claim 16, further comprising a working unit, wherein a main valve core is arranged in the working unit, an internal pilot oil supply port of the tail unit is communicated with pilot oil inlets at two ends of the main valve core so as to provide pilot oil for controlling the movement of the main valve core to the working unit through the tail unit, an internal pilot oil drain port of the tail unit is communicated with pilot oil drain ports at two ends of the main valve core so as to realize pilot oil drain through the tail unit, and oil inlet amount of a main oil inlet of the multi-way valve is controlled through electric proportion so as to realize electro-hydraulic proportional control of the main valve core.
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| CN201711455380.8A CN108194441B (en) | 2017-12-28 | 2017-12-28 | Multi-way valve tail connection and electro-hydraulic proportional multi-way valve |
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| CN201711455380.8A CN108194441B (en) | 2017-12-28 | 2017-12-28 | Multi-way valve tail connection and electro-hydraulic proportional multi-way valve |
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| CN109707690B (en) * | 2019-01-18 | 2020-08-07 | 江苏汇智高端工程机械创新中心有限公司 | Electric proportional load sensitive multi-way valve integrated with hydraulic lock |
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