WO2014208828A1 - 플로팅기능을 갖는 건설기계용 유압회로 및 플로팅기능 제어방법 - Google Patents
플로팅기능을 갖는 건설기계용 유압회로 및 플로팅기능 제어방법 Download PDFInfo
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- WO2014208828A1 WO2014208828A1 PCT/KR2013/009788 KR2013009788W WO2014208828A1 WO 2014208828 A1 WO2014208828 A1 WO 2014208828A1 KR 2013009788 W KR2013009788 W KR 2013009788W WO 2014208828 A1 WO2014208828 A1 WO 2014208828A1
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- boom
- hydraulic
- control valve
- pressure
- hydraulic cylinder
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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
- E02F9/2203—Arrangements for controlling the attitude of actuators, e.g. speed, floating function
- E02F9/2207—Arrangements for controlling the attitude of actuators, e.g. speed, floating function for reducing or compensating oscillations
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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
- E02F9/2221—Control of flow rate; Load sensing arrangements
- E02F9/2225—Control of flow rate; Load sensing arrangements using pressure-compensating valves
- E02F9/2228—Control of flow rate; Load sensing arrangements using pressure-compensating valves including an electronic controller
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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
- E02F9/2221—Control of flow rate; Load sensing arrangements
- E02F9/2239—Control of flow rate; Load sensing arrangements using two or more pumps with cross-assistance
- E02F9/2242—Control of flow rate; Load sensing arrangements using two or more pumps with cross-assistance including an electronic controller
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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
- E02F9/2278—Hydraulic circuits
- E02F9/2282—Systems using center bypass type changeover valves
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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
- E02F9/2278—Hydraulic circuits
- E02F9/2285—Pilot-operated systems
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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
- E02F9/2278—Hydraulic circuits
- E02F9/2292—Systems with two or more pumps
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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
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
- F15B11/10—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor in which the servomotor position is a function of the pressure also pressure regulators as operating means for such systems, the device itself may be a position indicating system
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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
- F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/021—Valves for interconnecting the fluid chambers of an actuator
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/20576—Systems with pumps with multiple pumps
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/3056—Assemblies of multiple valves
- F15B2211/30565—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/31—Directional control characterised by the positions of the valve element
- F15B2211/3122—Special positions other than the pump port being connected to working ports or the working ports being connected to the return line
- F15B2211/3127—Floating position connecting the working ports and the return line
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
- F15B2211/3157—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line
- F15B2211/31582—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line having multiple pressure sources and a single output member
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/63—Electronic controllers
- F15B2211/6303—Electronic controllers using input signals
- F15B2211/6306—Electronic controllers using input signals representing a pressure
- F15B2211/6313—Electronic controllers using input signals representing a pressure the pressure being a load pressure
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/63—Electronic controllers
- F15B2211/6303—Electronic controllers using input signals
- F15B2211/6306—Electronic controllers using input signals representing a pressure
- F15B2211/6316—Electronic controllers using input signals representing a pressure the pressure being a pilot pressure
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/665—Methods of control using electronic components
Definitions
- the present invention relates to a hydraulic circuit for a construction machine having a floating function and a method for controlling the floating function. More specifically, the hydraulic fluid of the hydraulic pump is changed when the boom is lowered by a flat stop work or lowered by a weight using an excavator.
- the present invention relates to a hydraulic circuit and a floating function control method for a construction machine having a floating function that can be used for a hydraulic actuator.
- Hydraulic circuit for construction machinery having a floating function is disclosed in Republic of Korea Patent No. 10-0621977, as shown in Figure 1, at least two or more hydraulic pumps (1, 2);
- the boom joining control valve 5 and the boom joining control valve 5 installed in the flow path between the other hydraulic pump 2 and the hydraulic cylinder 3 are switched.
- the hydraulic oil of the hydraulic pump 2 is joined to the hydraulic oil of the hydraulic pump 1 which has passed through the boom driving control valve 4 to supply a joining flow rate to the large chamber of the hydraulic cylinder 3 or the hydraulic pressure.
- the large chamber of the cylinder 3 and the small chamber of hydraulic fluid are joined to the floating state connected to the hydraulic tank 6;
- Control valve (7) installed in the flow path between the operating lever (not shown) and the boom driving control valve (4) and the boom confluence control valve (5), for switching the control valve (7) for boom driving Applying the boom lowering pilot pressure to the control valve (4) to supply the hydraulic oil of the hydraulic pump (1) to the small chamber of the hydraulic cylinder (3), or to apply the boom lowering pilot pressure to the boom joining control valve (5) It is applied to switch to the on state in order to switch the control valve 5 for the boom joining to a floating state.
- the boom lowering pilot pressure is controlled by the operation lever via the control valve 7 to control the boom joining valve ( It is applied to one end of 5) to switch the spool to the left in the drawing.
- the boom joining control valve 5 is switched to the floating state.
- the large chamber of the hydraulic cylinder 3 and the hydraulic chamber of the small chamber are joined to the hydraulic oil tank 6, and the hydraulic oil of the hydraulic pumps 1, 2 is joined. Since it is connected to the hydraulic oil tank (6), it is switched to the floating state.
- the present invention is to solve the above problems, the hydraulic circuit and the floating function for a construction machine having a floating function to deactivate the floating function during the boom up or jack-up operation, and to activate the floating function when the boom is lowered It is an object to provide a control method.
- At least two or more hydraulic pumps are provided;
- a hydraulic cylinder driven by the hydraulic oil supplied from the hydraulic pump
- a boom driving control valve installed in a flow path between one hydraulic pump and the hydraulic cylinder among the hydraulic pumps and controlling the start, stop, and direction change of the hydraulic cylinder during switching;
- the boom confluence control valve installed in the flow path between the other hydraulic pump and the hydraulic cylinder, the boom confluence control valve joins the hydraulic fluid discharged from the hydraulic pump at the time of switching, the large chamber of the hydraulic cylinder Supplying or to the hydraulic chamber of the hydraulic chamber and the large chamber of the hydraulic cylinder to connect to the hydraulic oil tank;
- a first pressure sensor for measuring the hydraulic pressure of the large chamber side of the hydraulic cylinder
- a second pressure sensor for measuring a boom lowering pilot pressure applied to the other end of the boom driving control valve
- a control valve installed in a flow path between the operation lever, the boom driving control valve and the boom joining control valve, and the control valve is switched by applying an electrical signal corresponding to the pressure detection value of the first and second pressure sensors; Applying a boom lowering pilot pressure to the boom confluence control valve to switch the boom confluence control valve to a floating state, or applying a boom lowering pilot pressure to the boom driving control valve to switch the boom driving control valve.
- two or more hydraulic pumps A hydraulic cylinder driven by the hydraulic oil supplied from the hydraulic pump;
- the boom drive control valve is installed in the flow path between the one side hydraulic pump and the hydraulic cylinder;
- a boom joining control valve installed in a flow path between the other hydraulic pump and the hydraulic cylinder among the hydraulic pumps;
- Operation lever A first pressure sensor for measuring the hydraulic pressure of the large chamber side of the hydraulic cylinder;
- a second pressure sensor for measuring a boom lowering pilot pressure applied to the boom driving control valve;
- the floating machine control method for a construction machine comprising: a control valve installed in the flow path between the operation lever and the other end of the boom driving control valve and the boom joining control valve:
- the control valve When the boom floating function switch is operated in an on state, the control valve is switched to an on state by applying an electrical signal, and the boom lowering pilot pressure is applied to the boom joining control valve to float the boom joining control valve. Switching to a state;
- the control valve is the control valve
- the control valve is the control valve
- At least two hydraulic pumps At least two hydraulic pumps
- a hydraulic cylinder driven by the hydraulic oil supplied from the hydraulic pump
- a boom driving control valve installed in a flow path between one hydraulic pump and the hydraulic cylinder among the hydraulic pumps and controlling the start, stop, and direction change of the hydraulic cylinder during switching;
- a large chamber of the hydraulic cylinder is formed by joining the boom joining control valve installed in the flow path between the other hydraulic pump and the hydraulic cylinder and the hydraulic fluid discharged from the hydraulic pumps when the control valve for boom joining is switched. Supplying a confluence flow rate to the condenser, or consolidating the large chamber and the small chamber hydraulic fluid to the hydraulic fluid tank;
- a first pressure sensor for measuring the hydraulic pressure of the large chamber side of the hydraulic cylinder
- a second pressure sensor for measuring a boom lowering pilot pressure applied to the boom driving control valve
- One side hydraulic pump is installed in the flow path between the operation lever and the boom driving control valve and generates a boom lowering pilot pressure to be proportional to an applied electrical signal to apply the boom lowering pilot pressure generated to the boom driving control valve.
- a second electromagnetic proportional control valve for supplying hydraulic fluid to the small chamber of the hydraulic cylinder;
- Pressure detection values measured by the first and second pressure sensors are input, and electrical signals calculated by the first and second electromagnetic proportional control valves are calculated by calculating electrical signals corresponding to the pressure detection values of the second pressure sensors. It provides a hydraulic circuit for a construction machine having a floating function, characterized in that it comprises a controller for applying.
- Two or more hydraulic pumps A hydraulic cylinder driven by the hydraulic oil supplied from the hydraulic pump; Of the hydraulic pump, the boom drive control valve is installed in the flow path between the one side hydraulic pump and the hydraulic cylinder; A boom joining control valve installed in a flow path between the other hydraulic pump and the hydraulic cylinder among the hydraulic pumps; Operation lever; A first pressure sensor for measuring the hydraulic pressure of the large chamber side of the hydraulic cylinder; A second pressure sensor for measuring a boom lowering pilot pressure applied to the boom driving control valve; A first electromagnetic proportional control valve installed in a flow path between the operation lever and the control valve for boom joining;
- a second electromagnetic proportional control valve installed in the flow path between the operation lever and the boom drive control valve:
- the hydraulic oil from the hydraulic pump can be supplied to another hydraulic actuator to save hydraulic energy.
- the hydraulic oil of the hydraulic pump by supplying the hydraulic oil of the hydraulic pump to the small chamber of the boom cylinder in the floating mode selectively has an effect that can improve the work efficiency.
- FIG. 1 is a hydraulic circuit diagram for a construction machine having a floating function according to the prior art.
- FIG. 2 is a hydraulic circuit diagram for a construction machine having a floating function according to an embodiment of the present invention.
- FIG. 3 is a control algorithm of a control valve in a hydraulic circuit for a construction machine having a floating function according to an embodiment of the present invention.
- FIG. 4 is a hydraulic circuit diagram for a construction machine having a floating function according to another embodiment of the present invention.
- FIG. 5 is a control algorithm of a control valve in a hydraulic circuit for a construction machine having a floating function according to another embodiment of the present invention.
- FIG. 2 is a hydraulic circuit diagram for a construction machine having a floating function according to an embodiment of the present invention
- Figure 3 is a hydraulic circuit for a construction machine having a floating function according to an embodiment of the present invention
- a control algorithm of a control valve 4 is a hydraulic circuit diagram for a construction machine having a floating function according to another embodiment of the present invention
- Figure 5 is a hydraulic circuit for a construction machine having a floating function according to another embodiment of the present invention, a control algorithm of a control valve to be.
- the boom joining control valve 5 and the boom joining control valve 5 installed in the flow path between the other hydraulic pump 2 and the hydraulic cylinder 3 are switched.
- the hydraulic oil discharged from the hydraulic pumps (1, 2) is joined to supply to the large chamber of the hydraulic cylinder (3), or the hydraulic chamber of the large chamber and the small chamber of the hydraulic cylinder (3) by joining the hydraulic oil tank ( 6);
- the control valve 7 is installed in the flow path between the operation lever, the boom driving control valve 4 and the boom confluence control valve 5, the control valve 7 is the first and second pressure sensors (8) By applying an electrical signal corresponding to the pressure detection value of the 9, the boom lowering pilot pressure is applied to the boom confluence control valve 5 to switch the boom confluence control valve 5 to a floating state. , The boom lowering pilot pressure is applied to the boom driving control valve (4) to supply the hydraulic oil of one hydraulic pump (1) to the small chamber of the hydraulic cylinder (3) by switching of the boom driving control valve (4) It is characterized by.
- the control valve 7 is,
- An initial state of supplying hydraulic oil of the one side hydraulic pump 1 to the small chamber of the hydraulic cylinder 3 by applying a boom lowering pilot pressure to the boom driving control valve 4, and the boom confluence control valve ( It is characterized in that the solenoid valve is switched to the on (ON) state to apply the boom lowering pilot pressure to 5) to switch the boom confluence control valve (5) to a floating state.
- the control valve 7 is,
- the boom lowering pilot pressure is equal to or greater than a predetermined set pressure by the detection signal of the second pressure sensor 9, and the large chamber hydraulic oil pressure of the hydraulic cylinder 3 is detected by the detection signal of the first pressure sensor 8.
- the pressure is less than or equal to the predetermined set pressure, it is switched to the OFF state.
- the floating function control method according to an embodiment of the present invention, two or more hydraulic pumps (1, 2); A hydraulic cylinder (3) driven by the hydraulic oil supplied from the hydraulic pumps (1, 2); A boom driving control valve (4) installed in a flow path between one hydraulic pump (1) and the hydraulic cylinder (3) of the hydraulic pumps (1, 2); A boom joining control valve (5) installed in a flow path between the other hydraulic pump (2) and the hydraulic cylinder (3) of the hydraulic pump (1, 2); Operation lever (not shown); A first pressure sensor (8) for measuring the hydraulic pressure of the large chamber side of the hydraulic cylinder (3); A second pressure sensor 9 for measuring a boom lowering pilot pressure applied to the boom driving control valve 4;
- the floating machine control method for a construction machine comprising: a control valve (7) installed in the flow path between the operating lever and the boom drive control valve (4) and the boom confluence control valve (5):
- the control valve 7 When the boom floating function switch is operated in an on state, the control valve 7 is switched to an on state by applying an electrical signal, and a boom lowering pilot pressure is applied to the boom joining control valve 5 so that the boom Switching the joining control valve 5 to a floating state (S20);
- the boom which measures the large chamber hydraulic oil pressure of the hydraulic cylinder 3 by the said 1st pressure sensor 8, and is applied to the other end of the said boom drive control valve 4 by the said 2nd pressure sensor 9 Measuring a downward pilot pressure (S30);
- the boom lowering pilot pressure is equal to or greater than a predetermined set pressure by the detection signal of the second pressure sensor 9, and the large chamber side hydraulic oil of the hydraulic cylinder 3 is detected by the detection signal of the first pressure sensor 8.
- the step of switching the control valve (7) to the OFF (OFF) state (S60); characterized in that it comprises a.
- reference numeral 11 denotes a controller for inputting a detection signal from the first and second pressure sensors 8 and 9 and applying an electrical signal to switch the control valve 7.
- the boom down pilot pressure passes through the control valve 7 to the boom. It is applied to the right end of the joining control valve 5.
- the hydraulic oil of the hydraulic pumps 1 and 2 joins and returns to the hydraulic oil tank 6, and the hydraulic oil of the small chamber and the large chamber of the hydraulic cylinder 3 passes through the inner passage of the control valve 5 for the boom joining. Joined in 5c) and returned to the hydraulic oil tank (6).
- the boom up pilot pressure is applied to the left ends of the boom joining control valve 5 and the boom driving control valve 4, respectively, so that the spool is switched in the right direction on the drawing. Let's do it. Accordingly, the hydraulic oil of the hydraulic pump 1 is supplied to the large chamber of the hydraulic cylinder 3 via the switched boom driving control valve 4, and the hydraulic oil of the hydraulic pump 2 is for the switched boom joining. It is supplied to the large chamber of the hydraulic cylinder 3 via the control valve 5.
- the hydraulic oil of the hydraulic pump 2 is joined to the hydraulic oil via the boom driving control valve 4 from the hydraulic pump 1 and supplied to the large chamber of the hydraulic cylinder 3, thereby enabling boom-up driving. .
- the large chamber hydraulic oil pressure of the hydraulic cylinder 3 is measured by the first pressure sensor 8, and is applied to the boom driving control valve 4 by the second pressure sensor 9.
- the boom lowering pilot pressure is measured, and the detection signals of the first and second pressure sensors 8 and 9 are transmitted to the controller 11.
- the detected boom lowering pilot pressure is set to an arbitrary set pressure Ps1 in contrast to the magnitude of the boom lowering pilot pressure detected by the second pressure sensor 9 and a predetermined set pressure Ps1. ), And proceeds to " S50 ", and ends when the detected boom lowering pilot pressure is lower than an arbitrary set pressure.
- the detected hydraulic cylinder 3 is compared with the size of the large chamber hydraulic oil pressure of the hydraulic cylinder 3 detected by the first pressure sensor 8 and a predetermined set pressure Ps2. If the large chamber hydraulic oil pressure is less than the predetermined set pressure, the process proceeds to " S60 ", and ends when the large chamber hydraulic oil pressure of the detected hydraulic cylinder 3 is greater than the predetermined set pressure.
- the boom lowering pilot pressure detected by the second pressure sensor 9 is equal to or greater than a predetermined set pressure Ps1, and the pressure of the hydraulic cylinder 3 detected by the first pressure sensor 8 is increased.
- the control valve 7 is turned off by an electrical signal applied from the controller 11.
- the second pressure The boom lowering pilot pressure measured by the sensor 9 is equal to or greater than an arbitrary set pressure Ps1 (boom lowering pilot pressure ⁇ Ps1), and the large pressure of the hydraulic cylinder 3 measured by the first pressure sensor 8 is increased.
- Ps1 boost lowering pilot pressure ⁇ Ps1
- Ps2 large chamber hydraulic oil pressure ⁇ Ps2 of the hydraulic cylinder 3
- the boom lowering pilot pressure by the operation of the operating lever is applied to the right end of the boom driving control valve 4 via the control valve 7 to switch the spool, so that the hydraulic oil of the hydraulic pump 1
- the hydraulic oil supplied to the small chamber of the hydraulic cylinder 3 via the boom driving control valve 4 and discharged from the large chamber of the hydraulic cylinder 3 is supplied to the hydraulic oil tank via the boom driving control valve 4. 6) is returned.
- the boom lowering pilot pressure detected by the second pressure sensor 9 is equal to or greater than a predetermined set pressure, and the hydraulic cylinder 3 is operated by the first pressure sensor 8.
- the control valve 7 is switched to the off state by an electrical signal applied from the controller 11.
- the boom lowering pilot pressure is applied to the boom driving control valve 4 so that the hydraulic oil of the hydraulic pump 1 can be supplied to the small chamber of the hydraulic cylinder 3, so that the boom can be lowered and jacked up. do.
- An operation lever (not shown) for outputting an operation signal corresponding to the operation amount
- the pressure detection values measured by the first and second pressure sensors 8 and 9 are input, and an electrical signal is calculated to correspond to the pressure detection value of the second pressure sensor 9 to generate the first and second electrons.
- a controller 11 for applying the calculated electrical signal to the proportional control valves 12 and 13.
- the boom lowering pilot pressure is equal to or greater than a predetermined set pressure Ps1 (boom lowering pilot pressure ⁇ Ps1), and by the detection signal of the first pressure sensor 8
- a predetermined set pressure Ps1 boom lowering pilot pressure ⁇ Ps1
- Ps2 operating oil pressure of the large chamber ⁇ Ps2
- the boom lowering pilot pressure is smaller than the predetermined set pressure Ps1 by the detection signal of the second pressure sensor 9 and the large of the hydraulic cylinder 3 is detected by the detection signal of the first pressure sensor 8.
- the boom lowering pilot pressure generated in proportion to an electrical signal corresponding to the pressure detection value of the second pressure sensor 9 controls the boom joining control valve ( And applying to 5), switching the boom joining control valve 5 to a floating mode (S600).
- the first electromagnetic proportional control valve 12 is installed in the flow path between the operation lever and the boom joining control valve 5, and the first installed in the flow path between the operation lever and the boom driving control valve 4
- the two electromagnetic proportional control valve 13 and the pressure detection value measured by the said 1st, 2nd pressure sensors 8 and 9 are input, and an electrical signal corresponding to the pressure detection value of the 2nd pressure sensor 9 is input.
- the controller 11 for applying the calculated electrical signals to the first and second electromagnetic proportional control valves 12 and 13 by calculating a the hydraulic pressure for construction machinery having a floating function according to an embodiment of the present invention. Since the configurations are the same as those of the circuits, detailed descriptions of these configurations are omitted and the reference numerals for the overlapping configurations are the same.
- the large chamber hydraulic oil pressure of the hydraulic cylinder 3 is measured by the first pressure sensor 8, and the boom driving control valve 4 is measured by the second pressure sensor 9. Measure the applied boom lowering pilot pressure.
- the detection signal measured by the first and second pressure sensors 8 and 9 is input to the controller 11.
- the boom lowering pilot pressure measured by the second pressure sensor 9 is equal to or greater than a predetermined set pressure Ps1, and of the hydraulic cylinder 3 measured by the first pressure sensor 8.
- the controller 11 may convert an electrical signal calculated to be proportional to the boom lowering pilot pressure measured by the second pressure sensor 9. To the control valve (13).
- the second electromagnetic proportional control valve 13 generates a pilot pressure corresponding to the applied electric signal, and applies the generated pilot pressure to the right end of the boom driving control valve 4. Accordingly, as the spool of the boom driving control valve 4 is switched to the left in the drawing, the hydraulic oil discharged from the hydraulic pump 1 passes through the switched boom driving control valve 4 to the hydraulic cylinder. The hydraulic oil supplied to the small chamber of (3) and discharged from the large chamber of the hydraulic cylinder 3 is returned to the hydraulic oil tank 6 via the boom drive control valve 4. Therefore, it is possible to lower the boom due to the contraction driving of the hydraulic cylinder (3).
- the boom lowering pilot pressure measured by the second pressure sensor 9 is equal to or greater than a predetermined set pressure, and the hydraulic pressure measured by the first pressure sensor 8 is measured.
- the boom driving control valve 4 is switched to supply hydraulic oil to the small chamber of the hydraulic cylinder 3 so that the jack is lowered by jacking down. up) can be driven.
- the boom lowering pilot pressure is smaller than the predetermined set pressure Ps1 by the detection signal of the second pressure sensor 9, and the hydraulic cylinder is detected by the detection signal of the first pressure sensor 8.
- the controller 11 is an electrical signal calculated to be proportional to the boom lowering pilot pressure measured by the second pressure sensor 9. Is applied to the first electromagnetic proportional control valve 12.
- the first electromagnetic proportional control valve 12 generates a pilot pressure corresponding to the applied electric signal, and applies the generated pilot pressure to the right end of the boom joining control valve 5. That is, as the spool of the boom confluence control valve 5 is switched to the left in the drawing, the hydraulic oil of the large chamber and the small chamber of the hydraulic cylinder 3 is joined to the hydraulic oil tank 6 so that The boom joining control valve 5 can be switched to the floating mode. At this time, the hydraulic oil discharged from the hydraulic pump (2) is returned to the hydraulic oil tank (6) via the boom joining control valve (5).
- the present invention having the above-described configuration, when the flat stop operation by using an excavator or lowering the boom by its own weight, it is possible to save hydraulic energy by supplying the hydraulic oil from the hydraulic pump to the hydraulic actuators other than the boom cylinder.
- the hydraulic fluid of the hydraulic pump is selectively supplied to the small chamber of the boom cylinder during the floating mode, thereby providing convenience to the driver and improving work efficiency.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- Operation Control Of Excavators (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
Description
Claims (6)
- 적어도 두개 이상의 유압펌프;상기 유압펌프로부터 공급되는 작동유에 의해 구동하는 유압실린더;상기 유압펌프 중, 일측 유압펌프와 상기 유압실린더 사이의 유로에 설치되고, 절환시 상기 유압실린더의 기동, 정지 및 방향전환을 제어하는 붐구동용 제어밸브;상기 유압펌프 중, 타측 유압펌프와 상기 유압실린더 사이의 유로에 설치되는 붐합류용 제어밸브, 상기 붐합류용 제어밸브는 절환시 상기 유압펌프들로부터 토출되는 작동유를 합류시켜 상기 유압실린더의 라지챔버에 공급시키거나, 상기 유압실린더의 라지챔버 및 스몰챔버의 작동유를 합류시켜 작동유탱크에 연결시킴;조작량에 대응되게 조작신호를 출력하는 조작레버;상기 유압실린더의 라지챔버측 작동유 압력을 계측하는 제1압력센서;상기 붐구동용 제어밸브의 타단에 인가되는 붐하강 파일럿압력을 계측하는 제2압력센서; 및상기 조작레버와 상기 붐구동용 제어밸브 및 붐합류용 제어밸브 사이의 유로에 설치되는 제어밸브, 상기 제어밸브는 상기 제1,2압력센서들의 압력검출값에 대응되는 전기적신호 인가에 의해 절환시 붐하강 파일럿압력을 상기 붐합류용 제어밸브에 인가시켜 상기 붐합류용 제어밸브를 플로팅상태로 절환시키거나, 붐하강 파일럿압력을 상기 붐구동용 제어밸브에 인가시켜 상기 붐구동용 제어밸브의 절환으로 일측 유압펌프의 작동유를 상기 유압실린더의 스몰챔버에 공급시킴;을 특징으로 하는 플로팅기능을 갖는 건설기계용 유압회로.
- 두개 이상의 유압펌프; 상기 유압펌프로부터 공급되는 작동유에 의해 구동하는 유압실린더; 상기 유압펌프 중, 일측 유압펌프와 상기 유압실린더 사이의 유로에 설치되는 붐구동용 제어밸브; 상기 유압펌프 중, 타측 유압펌프와 상기 유압실린더 사이의 유로에 설치되는 붐합류용 제어밸브; 조작레버; 상기 유압실린더의 라지챔버측 작동유 압력을 계측하는 제1압력센서; 상기 붐구동용 제어밸브의 타단에 인가되는 붐하강 파일럿압력을 계측하는 제2압력센서; 상기 조작레버와 상기 붐구동용 제어밸브 및 붐합류용 제어밸브 사이의 유로에 설치되는 제어밸브;를 포함하는 건설기계용 플로팅기능 제어방법에 있어서:붐 플로팅기능스위치의 온 조작 여부를 판단하는 단계;상기 붐 플로팅기능스위치가 온 상태로 조작된 경우, 전기적신호 인가에 의해 상기 제어밸브를 온 상태로 절환시켜, 붐하강 파일럿압력을 상기 붐합류용 제어밸브에 인가시켜 상기 붐합류용 제어밸브를 플로팅상태로 절환시키는 단계;상기 제1압력센서에 의해 상기 유압실린더의 라지챔버 작동유 압력을 계측하고, 상기 제2압력센서에 의해 상기 붐구동용 제어밸브의 타단에 인가되는 붐하강 파일럿압력을 계측하는 단계; 및상기 제2압력센서의 검출신호에 의해 상기 붐하강 파일럿압력이 임의의 설정압력 이상이고, 상기 제1압력센서의 검출신호에 의해 상기 유압실린더의 라지챔버측 작동유 압력이 임의의 설정압력 이하일 경우, 상기 제어밸브를 오프 상태로 절환시키는 단계;를 포함하는 것을 특징으로 하는 건설기계용 플로팅기능 제어방법.
- 제1항에 있어서, 상기 제어밸브는,상기 붐구동용 제어밸브에 붐하강 파일럿압력을 인가시켜 상기 일측 유압펌프의 작동유를 상기 유압실린더의 스몰챔버에 공급하는 초기상태와, 상기 붐합류용 제어밸브에 붐하강 파일럿압력을 인가시켜 상기 붐합류용 제어밸브를 플로팅상태로 절환하기 위해 온 상태로 절환되는 솔레노이드밸브인 것을 특징으로 하는 플로팅기능을 갖는 건설기계용 유압회로.
- 제1항에 있어서, 상기 제어밸브는,상기 제2압력센서의 검출신호에 의해 상기 붐하강 파일럿압력이 임의의 설정압력 이상이고, 상기 제1압력센서의 검출신호에 의해 상기 유압실린더의 라지챔버 작동유압력이 임의의 설정압력 이하일 경우, 오프 상태로 절환되는 것을 특징으로 하는 플로팅기능을 갖는 건설기계용 유압회로.
- 적어도 두개 이상의 유압펌프;상기 유압펌프로부터 공급되는 작동유에 의해 구동하는 유압실린더;상기 유압펌프 중, 일측 유압펌프와 상기 유압실린더 사이의 유로에 설치되고, 절환시 상기 유압실린더의 기동, 정지 및 방향전환을 제어하는 붐구동용 제어밸브;상기 유압펌프 중, 타측 유압펌프와 상기 유압실린더 사이의 유로에 설치되는 붐합류용 제어밸브, 상기 붐합류용 제어밸브의 절환시 상기 유압펌프들로부터 토출되는 작동유를 합류시켜 상기 유압실린더의 라지챔버에 합류유량을 공급시키거나, 상기 유압실린더의 라지챔버 및 스몰챔버의 작동유를 합류시켜 작동유탱크에 연결시킴;조작량에 대응되게 조작신호를 출력하는 조작레버;상기 유압실린더의 라지챔버측 작동유 압력을 계측하는 제1압력센서;상기 붐구동용 제어밸브에 인가되는 붐하강 파일럿압력을 계측하는 제2압력센서;상기 조작레버와 상기 붐합류용 제어밸브 사이의 유로에 설치되고, 인가되는 전기적신호에 비례하도록 붐하강 파일럿압력을 생성하여 상기 붐합류용 제어밸브에 생성된 붐하강 파일럿압력을 인가시켜 상기 붐합류용 제어밸브를 플로팅모드로 절환시키는 제1전자비례제어밸브;상기 조작레버와 상기 붐구동용 제어밸브 사이의 유로에 설치되고, 인가되는 전기적신호에 비례하도록 붐하강 파일럿압력을 생성하여 상기 붐구동용 제어밸브에 생성된 붐하강 파일럿압력을 인가시켜 일측 유압펌프의 작동유가 상기 유압실린더의 스몰챔버에 공급되도록 하는 제2전자비례제어밸브;상기 제1,2압력센서에 의해 계측된 압력검출값이 입력되고, 상기 제2압력센서의 압력검출값에 대응되게 전기적신호를 연산하여, 상기 제1,2전자비례제어밸브에 연산된 전기적신호를 인가시키는 콘트롤러;를 구비하는 것을 특징으로 하는 플로팅기능을 갖는 건설기계용 유압회로.
- 두개 이상의 유압펌프; 상기 유압펌프로부터 공급되는 작동유에 의해 구동하는 유압실린더; 상기 유압펌프 중, 일측 유압펌프와 상기 유압실린더 사이의 유로에 설치되는 붐구동용 제어밸브; 상기 유압펌프 중, 타측 유압펌프와 상기 유압실린더 사이의 유로에 설치되는 붐합류용 제어밸브; 조작레버; 상기 유압실린더의 라지챔버측 작동유 압력을 계측하는 제1압력센서; 상기 붐구동용 제어밸브에 인가되는 붐하강 파일럿압력을 계측하는 제2압력센서; 상기 조작레버와 상기 붐합류용 제어밸브 사이의 유로에 설치되는 제1전자비례제어밸브; 상기 조작레버와 상기 붐구동용 제어밸브 사이의 유로에 설치되는 제2전자비례제어밸브;를 포함하는 건설기계용 플로팅기능 제어방법에 있어서:붐 플로팅기능스위치의 온 조작 여부를 판단하는 단계;상기 제1압력센서에 의해 상기 유압실린더의 라지챔버 작동유 압력을 계측하고, 상기 제2압력센서에 의해 상기 붐구동용 제어밸브에 인가되는 붐하강 파일럿압력을 계측하는 단계; 및상기 제2압력센서의 검출신호에 의해 상기 붐하강 파일럿압력이 임의의 설정압력 이상이고, 상기 제1압력센서의 검출신호에 의해 상기 유압실린더의 라지챔버측 작동유 압력이 임의의 설정압력 이하일 경우, 상기 제2압력센서의 압력검출값에 대응되는 전기적신호에 비례하도록 생성되는 붐하강 파일럿압력을 상기 붐구동용 제어밸브에 인가시켜, 일측 유압펌프의 작동유를 상기 유압실린더의 스몰챔버에 공급시키는 단계; 및상기 제2압력센서의 검출신호에 의해 상기 붐하강 파일럿압력이 임의의 설정압력보다 작고, 상기 제1압력센서의 검출신호에 의해 상기 유압실린더의 라지챔버측 작동유 압력이 임의의 설정압력보다 큰 경우, 상기 제2압력센서의 압력검출값에 대응되는 전기적신호에 비례하도록 생성되는 붐하강 파일럿압력을 상기 붐합류용 제어밸브에 인가시켜, 상기 붐합류용 제어밸브를 플로팅모드로 절환시키는 단계;를 포함하는 것을 특징으로 하는 건설기계용 플로팅기능 제어방법.
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CA2916061A CA2916061C (en) | 2013-06-28 | 2013-10-31 | Hydraulic circuit for construction machinery having floating function and method for controlling floating function |
US14/900,495 US10094092B2 (en) | 2013-06-28 | 2013-10-31 | Hydraulic circuit for construction machinery having floating function and method for controlling floating function |
EP13888326.9A EP3015718B1 (en) | 2013-06-28 | 2013-10-31 | Hydraulic circuit for construction machinery having floating function and method for controlling floating function |
CN201380077847.3A CN105339679B (zh) | 2013-06-28 | 2013-10-31 | 用于具有浮动功能的工程机械的液压回路以及用于控制浮动功能的方法 |
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PCT/KR2013/009788 WO2014208828A1 (ko) | 2013-06-28 | 2013-10-31 | 플로팅기능을 갖는 건설기계용 유압회로 및 플로팅기능 제어방법 |
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KR102514523B1 (ko) * | 2015-12-04 | 2023-03-27 | 현대두산인프라코어 주식회사 | 건설기계의 유압 제어 장치 및 유압 제어 방법 |
CN106468062B (zh) * | 2016-09-22 | 2018-09-11 | 柳州柳工挖掘机有限公司 | 具有推土铲浮动功能的挖掘机推土液压*** |
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CN109996924B (zh) * | 2017-09-29 | 2021-04-06 | 株式会社日立建机Tierra | 工程机械 |
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CN105339679B (zh) | 2017-06-23 |
CA2916061A1 (en) | 2014-12-31 |
US20160333551A1 (en) | 2016-11-17 |
EP3015718A4 (en) | 2017-02-22 |
CN105339679A (zh) | 2016-02-17 |
WO2014208795A1 (ko) | 2014-12-31 |
EP3015718A1 (en) | 2016-05-04 |
US10094092B2 (en) | 2018-10-09 |
KR20160023710A (ko) | 2016-03-03 |
CA2916061C (en) | 2018-01-09 |
EP3015718B1 (en) | 2020-10-14 |
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