CN111075781B - Digital hydraulic control valve and loader comprising same - Google Patents
Digital hydraulic control valve and loader comprising same Download PDFInfo
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- CN111075781B CN111075781B CN201911259609.XA CN201911259609A CN111075781B CN 111075781 B CN111075781 B CN 111075781B CN 201911259609 A CN201911259609 A CN 201911259609A CN 111075781 B CN111075781 B CN 111075781B
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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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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
- E02F9/2267—Valves or distributors
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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
- 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
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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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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Fluid-Pressure Circuits (AREA)
- Operation Control Of Excavators (AREA)
Abstract
The invention relates to the technical field of hydraulic control, in particular to a digital hydraulic control valve and a loader comprising the digital hydraulic control valve. The numerical control overflow valve is fixedly arranged on the right side face of the valve seat, the check valve is arranged inside the left side face of the valve seat, the first digital control valve, the second digital control valve and the third digital control valve are fixedly arranged on the upper surface of the valve seat side by side from left to right in sequence, the electromagnetic directional valve and the hydraulic control check valve are fixedly arranged on the upper surface of the valve seat, the electromagnetic directional valve is located on the left side of the first digital control valve, and the hydraulic control check valve is located on the right side of the third digital control valve. The invention aims to provide a digital hydraulic control valve which integrates a steering hydraulic system and a working hydraulic system of a loader into a whole so as to simplify and improve the hydraulic system of the loader.
Description
Technical Field
The invention relates to the technical field of hydraulic control, in particular to a digital hydraulic control valve and a loader comprising the digital hydraulic control valve.
Background
The loader is an earth and stone construction machine widely applied to the aspects of building industry, infrastructure and the like, and mainly aims at loading, unloading and excavating of bulk materials, the running direction and the action of a bucket of the existing most of loaders are controlled by two sets of hydraulic systems, a steering hydraulic system controls the straight movement and the turning of the loader, a working hydraulic system controls the actions of shoveling, lifting, descending, upturning, downturning, position keeping and the like of the bucket of the loader, and the double-system control mode has the advantages that the steering and the working can be simultaneously operated without influencing the operation efficiency of the loader, and has the defects that the two sets of hydraulic systems are respectively provided with independent hydraulic elements such as a hydraulic pump and a control valve, the quantity and the functions of the hydraulic elements are multiple, the leakage points are multiple, the pressure loss of the steering system is large when the loader works, and the energy consumption is large.
Therefore, how to simplify and improve the steering hydraulic system and the working hydraulic system of the loader and improve the working performance of the loader becomes a difficult problem which needs to be solved urgently by people in the field.
Disclosure of Invention
The invention aims to provide a digital hydraulic control valve, which integrates a steering hydraulic system and a working hydraulic system of a loader into a whole to simplify and improve the hydraulic system of the loader.
In order to achieve the purpose, the invention provides the following technical scheme:
according to an aspect of the present invention, there is provided a digital hydraulic control valve, including a valve seat, an overflow valve, a check valve, a solenoid directional valve, a hydraulic control check valve, and a plurality of digital control valves, wherein the valve seat is provided with a first oil port, a second oil port, a third oil port, a fourth oil port, a fifth oil port, a sixth oil port, a seventh oil port, an eighth oil port, and a ninth oil port, the first oil port is respectively communicated with an oil inlet of the overflow valve, an oil inlet of the check valve, and a control oil port of the hydraulic control check valve through an internal oil passage, an oil outlet of the check valve is respectively communicated with an oil inlet of the first digital control valve, an oil inlet of the second digital control valve, and an oil inlet of the third digital control valve through the internal oil passage, the second oil port is respectively communicated with a first working oil port of the first digital control valve and a second working oil port of the solenoid directional valve through the internal oil passage, the third oil port is respectively communicated with a second working oil port of the first digital control valve and a first working oil port of the electromagnetic directional valve through an internal oil duct, the fourth oil port is communicated with a first working oil port of the second digital control valve through an internal oil duct, the fifth oil port is communicated with a second working oil port of the second digital control valve through an internal oil duct, the sixth oil port is communicated with a first working oil port of the third digital control valve through an internal oil duct, the seventh oil port is communicated with a second working oil port of the third digital control valve through an internal oil duct, the hydraulic control one-way valve is arranged on the oil duct between the eighth oil port and the ninth oil port, the eighth oil port is respectively communicated with an oil outlet of the electromagnetic directional valve, an oil outlet of the hydraulic control one-way valve and an oil inlet of the hydraulic control one-way valve, and an oil outlet of the hydraulic control one-way valve is respectively communicated with an oil outlet of the first digital control valve, an overflow valve, an oil outlet of the hydraulic control one-way valve, the oil outlet of the second digital control valve, the oil outlet of the third digital control valve and the ninth oil port are communicated through an internal oil duct.
Furthermore, a load feedback oil path and a tenth oil port communicated with the load feedback oil path are further arranged in the valve seat, unidirectional communication oil paths are respectively arranged among the load feedback oil path, the second oil port, the third oil port, the fourth oil port, the fifth oil port, the sixth oil port and the seventh oil port, and the oil flows to the tenth oil port.
Further, the first oil port, the second oil port, the fourth oil port and the sixth oil port are arranged on the back surface of the valve seat, the third oil port, the fifth oil port and the seventh oil port are arranged on the front surface of the valve seat, the eighth oil port is arranged on the upper surface of the valve seat, and the ninth oil port and the tenth oil port are arranged on the left side surface of the valve seat.
Furthermore, the overflow valve is fixedly arranged on the right side face of the valve seat, the check valve is arranged inside the left side face of the valve seat, the first digital control valve, the second digital control valve and the third digital control valve are sequentially and fixedly arranged on the upper surface of the valve seat side by side from left to right, the electromagnetic directional valve and the hydraulic control check valve are fixedly arranged on the upper surface of the valve seat, the electromagnetic directional valve is positioned on the left side of the first digital control valve, and the hydraulic control check valve is positioned on the right side of the third digital control valve.
Furthermore, the digital control valve is a three-position four-way electromagnetic directional valve with a digital control end.
Furthermore, the electromagnetic directional valve is a two-position four-way electromagnetic directional valve.
According to another aspect of the present invention, there is provided a loader comprising the above-described digital hydraulic control valve.
Compared with the prior art, the invention has the beneficial effects that:
the hydraulic control elements of the steering hydraulic system and the working hydraulic system are integrated on one valve seat, so that the steering and bucket work of the loader can be controlled by one set of hydraulic system, the hydraulic elements are reduced, and the hydraulic system of the loader is simplified. The digital control valve is arranged, the digital hydraulic control technology can be adopted, the action of each oil cylinder of the loader is accurately controlled, and the working performance of the loader is improved.
Drawings
FIG. 1 is a hydraulic schematic of the present invention;
FIG. 2 is a front view of the structure of the present invention;
FIG. 3 is a left side view of the structure of the present invention;
FIG. 4 is a rear view of the structure of the present invention;
FIG. 5 is a top view of the structure of the present invention;
FIG. 6 is a three-dimensional view of the structure of the present invention;
FIG. 7 is a hydraulic schematic of a loader incorporating the present invention;
in the figure: 1-valve seat, 2-overflow valve, 3-one-way valve, 41-first digital control valve, 42-second digital control valve, 43-third digital control valve, 5-electromagnetic directional valve, 6-hydraulic control one-way valve, 7-load feedback oil circuit, 8-load sensitive variable pump, 9-lifting oil cylinder, 10-first encoder, 11-tipping oil cylinder, 12-second encoder, 13-steering oil cylinder, 14-front frame, 15-third encoder, 16-steering wheel steering column, 17-fourth encoder, 18-PLC control unit, 19-operating handle and 20-overload protection valve.
The oil pump comprises a first oil port P, a second oil port A1, a third oil port B1, a fourth oil port A2, a fifth oil port B2, a sixth oil port A3, a seventh oil port B3, an eighth oil port T1, a ninth oil port T1 and a tenth oil port LS.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
The first embodiment is as follows:
referring to fig. 1-6, a digital hydraulic control valve includes a valve seat 1, an overflow valve 2, a check valve 3, an electromagnetic directional valve 5, a hydraulic control check valve 6, and a plurality of digital control valves, the valve seat 1 is provided with a first oil port P, a second oil port A1, a third oil port B1, a fourth oil port A2, a fifth oil port B2, a sixth oil port A3, a seventh oil port B3, an eighth oil port T, and a ninth oil port T1, the first oil port P is respectively communicated with an oil inlet of the overflow valve 2, an oil inlet of the check valve 3, and a control oil port of the hydraulic control check valve 6 through an internal oil passage, an oil outlet of the check valve 3 is respectively communicated with an oil inlet 41P of the first digital control valve 41, an oil inlet 42P of the second digital control valve 42, and an oil inlet 43P of the third digital control valve 43 through the internal oil passage, the second oil port A1 is respectively communicated with a first working oil port 41A of the first digital control valve 41A and a second working oil port 5B of the electromagnetic directional valve 5 through the internal oil passage, the second oil passage 42B is respectively communicated with an oil passage 42B of the electromagnetic directional valve 5 through the internal oil passage, the second oil passage 42B is respectively communicated with an oil passage 42B of the electromagnetic directional valve 5, the second oil passage 6, the digital control valve 5, the second oil passage 42B and the electromagnetic directional valve 6 through the digital control valve 42B, the digital control valve 42B are respectively, an oil outlet of the hydraulic control one-way valve 6 is respectively communicated with an oil outlet 41T of the first digital control valve 41, an oil outlet 42T of the second digital control valve 42, an oil outlet 43T of the third digital control valve 43 and a ninth oil port T1 through internal oil ducts.
Fig. 7 is a hydraulic schematic diagram of a loader equipped with the hydraulic pressure control device of the present invention, as shown in fig. 7, the loader includes a load-sensitive variable pump 8, a lift cylinder 9, a first encoder 10, a skip cylinder 11, a second encoder 12, a steering cylinder 13, a front frame 14, a third encoder 15, a steering wheel column 16, a fourth encoder 17, a PLC control unit 18, a control handle 19, and an overload protection valve 20, an oil outlet of the load-sensitive variable pump 8 is fluidly connected to a first port P, a second port A1, a third port B1 are fluidly connected to a rod chamber and a rodless chamber of the lift cylinder 9, a fourth port A2, and a fifth port B2 are fluidly connected to a rodless chamber and a rod chamber of the skip cylinder 11, a sixth port A3, and a seventh port B3 are fluidly connected to two working ports of the overload protection valve 20, respectively, and are further communicated to two working oil paths of the steering cylinder 13, an eighth port T is fluidly connected to an oil return port of the oil tank, a ninth port T1 is fluidly connected to an oil drain port LS of the overload protection valve 20, and a tenth port is fluidly connected to a load-sensitive variable port control end of the load-sensitive variable pump 8.
The first encoder 10 is installed on the lifting oil cylinder 9 and is electrically connected with the input end of the PLC control unit 18, the second encoder 12 is installed on the skip oil cylinder 11 and is electrically connected with the input end of the PLC control unit 18, the third encoder 15 is installed near the lower hinge pin of the front frame 14 and is electrically connected with the input end of the PLC control unit 18, the fourth encoder 17 is installed on the steering wheel steering column 16 and is electrically connected with the input end of the PLC control unit 18, the control handle 19 is electrically connected with the input end of the PLC control unit 18, and four buttons of bucket ascending, bucket descending, bucket upturning and bucket declining are arranged.
In order to further optimize the technical scheme, a load feedback oil path 7 and a tenth oil port LS communicated with the load feedback oil path are further arranged inside the valve seat 1, one-way communication oil paths are respectively arranged among the load feedback oil path 7, the second oil port A1, the third oil port B1, the fourth oil port A2, the fifth oil port B2, the sixth oil port A3 and the seventh oil port B3, the oil flows in the direction of the tenth oil port LS, the lifting oil cylinder 9, the tipping bucket oil cylinder 11 and the steering oil cylinder 13 feed back pressure signals to a control end of the load sensitive variable pump 8 through the load feedback oil path 7, and the load sensitive variable pump 8 automatically changes flow output according to the load pressure condition, so that the automatic control of pressure and flow is realized, and the energy consumption is reduced.
For further optimizing above-mentioned technical scheme, first hydraulic fluid port P, second hydraulic fluid port A1, fourth hydraulic fluid port A2 and sixth hydraulic fluid port A3 set up in the back of disk seat 1, and third hydraulic fluid port B1, fifth hydraulic fluid port B2 and seventh hydraulic fluid port B3 set up in the front of disk seat 1, and eighth hydraulic fluid port T sets up in the upper surface of disk seat 1, and ninth hydraulic fluid port T1 and tenth hydraulic fluid port LS set up in the left surface of disk seat 1, are favorable to the distribution and the trend of hydraulic system pipeline.
In order to further optimize the technical scheme, the overflow valve 2 is fixedly arranged on the right side face of the valve seat 1, the check valve 3 is installed inside the left side face of the valve seat 1, the first digital control valve 41, the second digital control valve 42 and the third digital control valve 43 are fixedly arranged on the upper surface of the valve seat 1 side by side from left to right in sequence, the electromagnetic directional valve 5 and the hydraulic control check valve 6 are fixedly arranged on the upper surface of the valve seat 1, the electromagnetic directional valve 5 is located on the left side of the first digital control valve 41, and the hydraulic control check valve 6 is located on the right side of the third digital control valve 43, so that arrangement of all hydraulic elements and hydraulic pipelines is facilitated.
In order to further optimize the technical scheme, the three digital control valves are three-position four-way electromagnetic directional valves with digital control ends, the digital control ends of the three digital control valves are electrically connected with the output end of the PLC control unit 18, and the three digital control valves can receive instructions from the PLC control unit 18 to control the action of the valve core.
In order to further optimize the above technical solution, the electromagnetic directional valve 5 is a two-position four-way electromagnetic directional valve, and a control end thereof is electrically connected to an electromagnetic directional valve switch (not shown in the figure) disposed in the cab.
The second embodiment:
the invention has the function of controlling the lifting and descending of a loader bucket, as shown in fig. 7, when the loader needs to perform a bucket lifting action, a bucket lifting button on a control handle 19 is pressed, a PLC control unit 18 receives an instruction and sends an instruction to a control end of a first digital control valve 41, a valve core moves upwards and works at a lower position, an oil inlet 41P is communicated with a second working oil port 41B, an oil outlet 41T is communicated with the first working oil port 41A, pressure oil output by a load sensitive variable pump 8 flows into a rodless cavity of a lifting oil cylinder 9 through a one-way valve 3, an oil inlet 41P of the first digital control valve 41 and the second working oil port 41B, a piston rod is pushed to extend outwards to push the bucket to ascend, hydraulic oil in a rod cavity of the lifting oil cylinder 9 flows back to the oil tank through the first working oil port 41A, the oil port 41T and an eighth oil port T of the first digital control valve 41, meanwhile, a first encoder 10 transmits piston rod displacement information of the lifting oil cylinder 9 to the PLC control unit 18 when a piston rod of the lifting oil cylinder 9 reaches a preset position (the bucket lifting position reaches a preset position), and energy consumption of the hydraulic oil port is prevented when the PLC control unit stops, the hydraulic oil cylinder 9 from impacting a lifting oil outlet, the hydraulic oil cylinder 9 stops, and the hydraulic oil pressure of the hydraulic oil outlet, the hydraulic control unit, the hydraulic oil cylinder 9 stops being consumed by the PLC control unit, and the PLC control unit, the hydraulic pressure is not to stop, and the hydraulic pressure of the hydraulic pressure control unit, the hydraulic pressure oil cylinder 9, the hydraulic oil pressure is not consumed by the hydraulic pressure is prevented from being consumed by the hydraulic oil pressure of the hydraulic oil pump. During the bucket lifting process, the bucket lifting button can be released according to actual conditions, the PLC control unit 18 outputs a stop command, the valve core of the first digital control valve 41 returns to the middle position, the working oil path of the lifting oil cylinder 9 is cut off, and the bucket of the loader stops lifting.
Similarly, the function of controlling the loader bucket to descend can be realized by pressing down the bucket descending button on the operating handle 19.
Example three:
the invention has the function of controlling the loader bucket to upturn and the bucket to decline, as shown in fig. 7, when the loader needs to do the bucket upturn, the bucket upturn button on the control handle 19 is pressed, the PLC control unit 18 receives the instruction and sends the instruction to the control end of the second digital control valve 42, the valve core moves downwards and works in the upper position, the oil inlet 42P is communicated with the first working oil port 42A, the oil outlet 42T is communicated with the second working oil port 42B, the pressure oil output by the load sensitive variable pump 8 enters the rodless cavity of the tipping bucket oil cylinder 11 through the one-way valve 3, the oil inlet 42P of the second digital control valve 42 and the first working oil port 42A, the piston rod is pushed to extend outwards to push the bucket to upturn, the hydraulic oil in the rod cavity of the tipping bucket oil cylinder 11 flows back to the oil tank through the second working oil port 42B, the oil outlet 42T and the eighth oil port of the second digital control valve 42, meanwhile, the second encoder 12 transmits the displacement information of the piston rod of the tipping bucket oil cylinder 11 to the PLC control unit 18, when the displacement reaches a preset value, namely when the piston rod of the tipping bucket oil cylinder 11 reaches a preset position (the bucket is turned upwards to the preset position), the PLC control unit 18 outputs a stop instruction, the valve core of the second digital control valve 42 returns to the middle position, the working oil path of the tipping bucket oil cylinder 11 is cut off, the bucket of the loader stops turning upwards, and the hydraulic impact and the consumption of a large amount of energy on a hydraulic system and the tipping bucket oil cylinder 11 caused by the fact that an operator does not loosen a bucket turning-upwards button when the piston rod of the tipping bucket oil cylinder 11 reaches the limit position are prevented, so that the accurate control on the movement of the piston rod of the tipping bucket oil cylinder 11 is realized, and the energy consumption is reduced. In the bucket upturning process, the bucket upturning button can be released according to actual conditions, the PLC control unit 18 outputs a stop instruction, the valve core of the second digital control valve 42 returns to the middle position, the working oil path of the tipping bucket oil cylinder 11 is cut off, and the bucket of the loader stops upturning.
Similarly, the bucket turning-down button on the control handle 19 is pressed to realize the function of controlling the loader bucket to turn down.
Example four:
the invention has the function of controlling the steering of the loader, as shown in fig. 7, when the steering column 16 of the steering wheel is driven by the left turn of the steering wheel, the fourth encoder 17 transmits the rotation parameter to the PLC control unit 18, the PLC control unit 18 sends the instruction to the control end of the third digital control valve 43, the valve core moves upwards and works in the lower position, the oil inlet 43P and the second working oil port 43B are communicated, the oil outlet 43T and the first working oil port 43A are communicated, the pressure oil output by the load sensitive variable pump 8 enters the left turn oil path of the steering system through the check valve 3, the oil inlet 43P and the second working oil port 43B of the third digital control valve 43, so as to realize the left turn function of the loader, meanwhile, the third encoder 15 transmits the angle rotation information of the front frame 14 to the PLC control unit 18, when the angle rotation data reaches the preset value, that is, the left turn of the loader reaches the limit position, the PLC control unit 18 outputs the stop instruction, the valve core of the third digital control valve 43 returns to the middle position, so as to cut off the steering working oil path, thereby preventing the hydraulic system and the steering cylinder 13 from causing hydraulic impact and consuming a large amount of energy.
Similarly, when the steering wheel turns right, the function of controlling the loader to turn right can be realized.
Example five:
the invention has the function of controlling the loader to level the ground, as shown in fig. 7, when the loader needs to level the ground, the switch of the electromagnetic directional valve (not shown in the figure) is pressed, the electromagnetic directional valve 5 is electrified, the valve core moves left and works at the right position, the first working oil port 5A, the second working oil port 5B and the oil outlet 5T are communicated with each other, the pressure in the rodless cavity and the rod cavity of the lifting oil cylinder 9 is the same as the external atmospheric pressure, so that the bucket is in a floating state and can follow the height fluctuation of the ground, and the function of leveling the ground is realized.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The utility model provides a digit hydraulic control valve, includes disk seat (1), overflow valve (2), check valve (3), solenoid directional valve (5) and hydraulically controlled check valve (6), its characterized in that: the oil-saving valve further comprises a plurality of digital control valves, the valve seat (1) is provided with a first oil port (P), a second oil port (A1), a third oil port (B1), a fourth oil port (A2), a fifth oil port (B2), a sixth oil port (A3), a seventh oil port (B3), an eighth oil port (T) and a ninth oil port (T1), the first oil port (P) is respectively communicated with an oil inlet of the overflow valve (2), an oil inlet of the check valve (3) and a control oil port of the hydraulic control check valve (6) through an internal oil duct, an oil outlet of the check valve (3) is respectively communicated with an oil inlet (41P) of the first digital control valve (41), an oil inlet (42P) of the second digital control valve (42) and an oil inlet (43P) of the third digital control valve (43) through an internal oil duct, the second oil port (A1) is respectively communicated with a first working oil port (41A) of the first digital control valve (41) and a second working oil port (5B) of the electromagnetic reversing valve (5) through an internal oil duct, the second oil port (A1) is respectively communicated with the second working oil port (41A) of the electromagnetic reversing valve (42) and the fourth oil port (B) through an internal oil duct (42), the fifth oil port (B2) is communicated with a second working oil port (42B) of the second digital control valve (42) through an internal oil duct, the sixth oil port (A3) is communicated with a first working oil port (43A) of the third digital control valve (43) through an internal oil duct, the seventh oil port (B3) is communicated with a second working oil port (43B) of the third digital control valve (43) through an internal oil duct, the hydraulic control one-way valve (6) is arranged on the oil duct between the eighth oil port (T) and the ninth oil port (T1), the eighth oil port (T) is respectively communicated with an oil outlet (5T) of the electromagnetic directional valve (5), an oil outlet of the overflow valve (2) and an oil inlet of the hydraulic control one-way valve (6) through an internal oil duct, the oil outlet of the hydraulic control one-way valve (6) is communicated with the oil outlet (41T) of the first digital control valve (41), the oil outlet (42T) of the second digital control valve (42), the oil outlet (43T) of the third digital control valve (43) and the ninth oil port (T1) through internal oil ducts respectively, the second oil port (A1) and the third oil port (B1) are in fluid connection with a rod cavity and a rodless cavity of the lifting oil cylinder (9) respectively, the fourth oil port (A2) and the fifth oil port (B2) are in fluid connection with a rodless cavity and a rod cavity of the tipping oil cylinder (11) respectively, and the sixth oil port (A3) and the ninth oil port (T1) are in fluid connection with the rod cavity and the rod cavity respectively, the seventh oil port (B3) is communicated with the steering oil cylinder (13) through an overload protection valve (20).
2. The digital hydraulic control valve of claim 1, wherein: the oil valve is characterized in that a load feedback oil path (7) and a tenth oil port (LS) communicated with the load feedback oil path are further arranged inside the valve seat (1), one-way communication oil paths are respectively arranged among the load feedback oil path (7), the second oil port (A1), the third oil port (B1), the fourth oil port (A2), the fifth oil port (B2), the sixth oil port (A3) and the seventh oil port (B3), and the oil flows to the tenth oil port (LS).
3. The digital hydraulic control valve of claim 1, wherein: the first oil port (P), the second oil port (A1), the fourth oil port (A2) and the sixth oil port (A3) are arranged on the back face of the valve seat (1), the third oil port (B1), the fifth oil port (B2) and the seventh oil port (B3) are arranged on the front face of the valve seat (1), the eighth oil port (T) is arranged on the upper surface of the valve seat (1), and the ninth oil port (T1) and the tenth oil port (LS) are arranged on the left side face of the valve seat (1).
4. The digital hydraulic control valve of claim 1, wherein: the overflow valve (2) is fixedly arranged on the right side face of the valve seat (1), the check valve (3) is arranged inside the left side face of the valve seat (1), the first digital control valve (41), the second digital control valve (42) and the third digital control valve (43) are sequentially and fixedly arranged on the upper surface of the valve seat (1) side by side from left to right, the electromagnetic directional valve (5) and the hydraulic control check valve (6) are fixedly arranged on the upper surface of the valve seat (1), the electromagnetic directional valve (5) is located on the left side of the first digital control valve (41), and the hydraulic control check valve (6) is located on the right side of the third digital control valve (43).
5. The digital hydraulic control valve of claim 1, wherein: the digital control valve is a three-position four-way electromagnetic reversing valve with a digital control end.
6. The digital hydraulic control valve of claim 1, wherein: the electromagnetic directional valve (5) is a two-position four-way electromagnetic directional valve.
7. A loader characterized in that: comprising a digital hydraulic control valve according to any of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911259609.XA CN111075781B (en) | 2019-12-10 | 2019-12-10 | Digital hydraulic control valve and loader comprising same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911259609.XA CN111075781B (en) | 2019-12-10 | 2019-12-10 | Digital hydraulic control valve and loader comprising same |
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| Publication Number | Publication Date |
|---|---|
| CN111075781A CN111075781A (en) | 2020-04-28 |
| CN111075781B true CN111075781B (en) | 2023-02-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911259609.XA Active CN111075781B (en) | 2019-12-10 | 2019-12-10 | Digital hydraulic control valve and loader comprising same |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102425580A (en) * | 2011-08-16 | 2012-04-25 | 中联重科股份有限公司 | Braking valve bank, hydraulic system having same and concrete spreader |
| CN202579392U (en) * | 2012-04-24 | 2012-12-05 | 徐州重型机械有限公司 | Hydraulic control valve and a fire truck upper truck hydraulic system provided with same |
| CN103215976A (en) * | 2012-01-20 | 2013-07-24 | 杨世祥 | All-digital full-hydraulic intelligent excavator device and control method |
| CN110144985A (en) * | 2019-05-06 | 2019-08-20 | 柳州柳工挖掘机有限公司 | Digger operating device control system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US11215201B2 (en) * | 2018-03-28 | 2022-01-04 | Kubota Corporation | Hydraulic system for working machine |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102425580A (en) * | 2011-08-16 | 2012-04-25 | 中联重科股份有限公司 | Braking valve bank, hydraulic system having same and concrete spreader |
| CN103215976A (en) * | 2012-01-20 | 2013-07-24 | 杨世祥 | All-digital full-hydraulic intelligent excavator device and control method |
| CN202579392U (en) * | 2012-04-24 | 2012-12-05 | 徐州重型机械有限公司 | Hydraulic control valve and a fire truck upper truck hydraulic system provided with same |
| CN110144985A (en) * | 2019-05-06 | 2019-08-20 | 柳州柳工挖掘机有限公司 | Digger operating device control system |
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| CN111075781A (en) | 2020-04-28 |
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Effective date of registration: 20230719 Address after: 337200 Luxi County Industrial Park, Pingxiang, Jiangxi Patentee after: Jiangxi Pingxiang Fangyuan Industrial Co.,Ltd. Address before: 337000 Luxi County Industrial Park, Pingxiang City, Jiangxi Province Patentee before: Jiangxi Boyuan Digital Hydraulic Technology Co.,Ltd. |