WO2012121427A1 - 파이프 레이어용 유압회로 - Google Patents
파이프 레이어용 유압회로 Download PDFInfo
- Publication number
- WO2012121427A1 WO2012121427A1 PCT/KR2011/001536 KR2011001536W WO2012121427A1 WO 2012121427 A1 WO2012121427 A1 WO 2012121427A1 KR 2011001536 W KR2011001536 W KR 2011001536W WO 2012121427 A1 WO2012121427 A1 WO 2012121427A1
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- Prior art keywords
- hydraulic
- valve
- hydraulic pump
- center bypass
- bypass passage
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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
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
- F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
- F16K11/06—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements
- F16K11/065—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members
- F16K11/07—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members with cylindrical slides
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F5/00—Dredgers or soil-shifting machines for special purposes
- E02F5/02—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches
- E02F5/10—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches with arrangements for reinforcing trenches or ditches; with arrangements for making or assembling conduits or for laying conduits or cables
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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
- E02F9/2232—Control of flow rate; Load sensing arrangements using one or more variable displacement pumps
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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
- E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
- E02F9/2267—Valves or distributors
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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
-
- 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
- E02F9/2296—Systems with a variable displacement pump
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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
- F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
- F15B11/165—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load for adjusting the pump output or bypass in response to demand
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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
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
- F15B13/043—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with electrically-controlled pilot valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
- F15B13/08—Assemblies of units, each for the control of a single servomotor only
-
- 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
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/18—Combined units comprising both motor and pump
-
- 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
- F15B2211/2053—Type of pump
- F15B2211/20546—Type of pump variable capacity
- F15B2211/20553—Type of pump variable capacity with pilot circuit, e.g. for controlling a swash plate
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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
-
- 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
- F15B2211/3105—Neutral or centre positions
- F15B2211/3116—Neutral or centre positions the pump port being open in the centre position, e.g. so-called open centre
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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
- F15B2211/32—Directional control characterised by the type of actuation
- F15B2211/329—Directional control characterised by the type of actuation actuated by fluid 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
- F15B2211/50—Pressure control
- F15B2211/505—Pressure control characterised by the type of pressure control means
- F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
- F15B2211/50536—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using unloading valves controlling the supply pressure by diverting fluid to the return line
Definitions
- the present invention relates to a hydraulic layer for a pipe layer to which a negative flow control system is applied, and in particular, in a pipe laying work mode (PL mode, which refers to a work of lifting an oil pipe or the like to a buried place).
- PL mode pipe laying work mode
- the present invention relates to a hydraulic circuit for a pipe layer that can prevent the occurrence of hydraulic shock to the equipment when the actuator for a work device (such as a boom cylinder) is finely operated.
- the negative flow control system described above reduces the discharge flow rate of the variable displacement hydraulic pump when the pilot signal pressure derived from the upstream side of the pilot signal pressure generating means installed downstream of the center by pass passage is high, When the signal pressure is low, it refers to a method of controlling to increase the discharge flow rate of the hydraulic pump.
- first and second hydraulic pumps (hereinafter referred to as first and second hydraulic pumps) P1 and P2 and a pilot pump P3 connected to the engine 1,
- the control valve is installed in the center bypass passage 6 of the second hydraulic pump P2 and controls the flow direction and amount of the hydraulic oil supplied to the right traveling motor and the second work device (boom cylinder, etc.) during switching. 7) (8),
- the swash plate of the first hydraulic pump P1 by the pressure selected from the pilot signal pressure Pi1 supplied to the pilot valve 12 and the downstream pressure of the center bypass passage 2 of the first hydraulic pump P1.
- a second shuttle valve 15 for controlling the tilt angle of the swash plate b of the second hydraulic pump P2 by a pressure selected from the side pressure.
- reference numeral 15 denotes a cbp spool provided downstream of the center bypass passages 2 and 6, and 16 denotes a main control valve (MCV).
- MCV main control valve
- the hydraulic fluid discharged from the above-described first hydraulic pump P1 and the second hydraulic pump P2 passes through the main control valve MCV 16 and the unloading valve 10 via the center bypass passages 2 and 6, respectively. Dividing into) is moved.
- the unloading valve 10 is not used in the excavation work mode of the equipment but is used when the pipe laying work mode (PL mode) signal is activated.
- a part of the hydraulic oil discharged from the above-mentioned first hydraulic pump P1 is supplied to the control valve 3 via the center bypass passage 2, thereby driving the left traveling motor.
- a part of the hydraulic oil from the first hydraulic pump P1 is supplied to the control valve 7 via the center bypass passage 2, the flow passage 25, and the switched traveling straight valve 9 in order, so that the right traveling motor Drive.
- a part of the hydraulic oil discharged from the above-described second hydraulic pump P2 is supplied to the control valve (4, 5) via the center bypass passage (6), the traveling straight valve (9), the flow path (26) Drive the device (slewing motor, etc.).
- a part of the hydraulic oil from the second hydraulic pump P2 is supplied to the control valve 8 via the center bypass passage 6 and the flow passage 27 in order to drive a work device (boom cylinder or the like).
- the traveling straight valve 9 is switched by the pilot signal pressure supplied from the pilot pump P3 by the driver during the pipe laying operation by the operation of the work mode switching valve 13, the first hydraulic pressure
- the hydraulic oil discharged from the pump P1 can be distributedly supplied to the left and right traveling motors, and the hydraulic oil discharged from the second hydraulic pump P2 can be distributedly supplied to the work device (boom cylinder or the like).
- the signal pressure (40k / cm2) to open the unloading valve 10 from the pilot valve (12) by the signal pressure supplied through the signal line 17 connected to the Ts port described above Works.
- the first and second shuttle valves 14 and 15 provided on the downstream side of the pilot valve 12 allow the signal pressure at the outlet ports A1 and A2 ports of the pilot valve 12 to be first and second shuttle valves. After passing through (14, 15), it is supplied to the ports Pi1, Pi2 of the first and second hydraulic pumps P1, P2 via the signal lines 18, 19, respectively. This minimizes the discharge flow rates of the first and second hydraulic pumps P1 and P2 because the swash plates a and b of the first and second hydraulic pumps P1 and P2 are controlled by the regulators R1 and R2. .
- the hydraulic oil of the signal lines 20 and 21 flowing out of the main control valve 16 also flows into the first and second shuttle valves 14 and 15 to reduce the discharge flow rates of the first and second hydraulic pumps P1 and P2. It is set to minimize.
- This state is defined as the neutral state of the pipe laying work mode.
- the attachment switching device for example, operation winch (HW), SW (swing), BM (boom) (operation signal by attachment control joystick)
- PS1, PS2 ports When operating the signal (30, 40), the hydraulic oil (40k / cm2) pressure applied from the PS2 port (or PS1 port) of the attachment switching device 40 To switch the pilot valve 12 to Pi1.
- the valve spool (cbp spool) 15 of the main control valve 16 is switched through the signal line 20.
- the attachment switching device 30 e.g., BM or SW
- the pilot valve 12 is switched to the left in the drawing while being connected to the Pi2 port of the pilot valve 12.
- the pressures of the A2 port of the pilot valve 12 and the Pi1 port of the pilot valve 11 almost disappear.
- the A1 port located in the pilot valve 11 and the Pi2 port of the unloading valve 10 pass through the tank line 22 and the pressure disappears. In this case, the P2 port and the T port of the unloading valve 10 are blocked from flow.
- the poppet type unloading valve 10 controls the flow rate in an ON and OFF manner by pilot signal pressure from the outside.
- the flow rate is controlled in an on and off manner. Accordingly, the passage opening cross-sectional area that is closed upon opening and closing of the unloading valve 10 is drastically reduced, so that hydraulic shock is generated (shown in FIG. 2 (a)). Therefore, even when the pilot signal pressure is applied to the unloading valve 10 low, it can be seen that the flow rate discharged from the first hydraulic pump P1 and the second hydraulic pump P2 increases rapidly (FIG. 2 ( shown in b)).
- Embodiments of the present invention relate to a hydraulic layer for a pipe layer that can improve the operability by preventing hydraulic shock due to excessive flow rate from the hydraulic pump when the operating device or traveling device is finely operated in the pipe laying work mode. .
- First and second hydraulic pump and pilot pump connected to the engine
- a control valve installed in the center bypass passage of the first hydraulic pump and controlling the flow direction and amount of the hydraulic oil supplied to the left traveling motor and the first working device at the time of switching;
- a control valve installed in the center bypass passage of the second hydraulic pump and controlling the flow direction and amount of the hydraulic oil supplied to the right traveling motor and the second working device at the time of switching;
- a traveling straight valve for distributing and supplying the control valve for the right traveling motor, respectively, and distributing and supplying the hydraulic oil of the second hydraulic pump to the control valve for the first and second working devices.
- An unloading valve for linearly controlling the closing of the passages to the hydraulic tanks in the center bypass passages of the first and second hydraulic pumps when the working device or the traveling device is finely operated in the pipe laying work mode;
- a valve spool for linearly controlling the closed opening cross-sectional area of the passage communicating with the hydraulic tank in the center bypass passage of the first and second hydraulic pumps when switching by the pilot signal pressure from the outside;
- the flow path is installed in the flow path between the outlet port of the valve spool and the hydraulic tank, and flows from the center bypass passage of the first and second hydraulic pumps to the hydraulic tank by the pressure formed in the center bypass passage of the first and second hydraulic pumps. It consists of a poppet that opens and closes.
- valve spool It is formed in the valve spool described above, and includes a notch for linearly controlling the passage of the passage from the center bypass passage of the first and second hydraulic pump to the hydraulic tank when the attachment is finely operated in the pipe laying work mode.
- a first shuttle valve for controlling the swash plate tilt angle of the first hydraulic pump by an unloading valve side pilot signal pressure and a pressure selected from a downstream pressure of the center bypass passage of the first hydraulic pump; and an unloading valve.
- a second shuttle valve for controlling the swash plate tilt angle of the second hydraulic pump by a pressure selected from the side pilot signal pressure and a pressure downstream of the center bypass passage of the second hydraulic pump.
- the hydraulic circuit for a pipe layer according to the embodiment of the present invention configured as described above has the following advantages.
- FIG. 2 (a, b) is a graph showing the operating characteristics of the unloading valve in the hydraulic circuit for a pipe layer according to the prior art
- FIG. 3 is a hydraulic circuit diagram for a pipe layer according to an embodiment of the present invention.
- Figure 4 is a cross-sectional view of the neutral state of the unloading valve in the hydraulic circuit for a pipe layer according to an embodiment of the present invention
- FIG. 5 is a hydraulic circuit diagram of the unloading valve in the hydraulic circuit for the pipe layer according to an embodiment of the present invention
- FIG. 6 (a, b) is a graph showing the operating characteristics of the unloading valve in the hydraulic circuit for a pipe layer according to an embodiment of the present invention.
- first and second hydraulic pumps (hereinafter referred to as first and second hydraulic pumps) P1 and pilot pumps P3 connected to the engine 1,
- Control valve (3) (4, 5),
- the control valve is installed in the center bypass passage 6 of the second hydraulic pump P2 and controls the flow direction and amount of the hydraulic oil supplied to the right traveling motor and the second work device (boom cylinder, etc.) during switching. 7) (8),
- the hydraulic oil of the first hydraulic pump P1 is supplied to the control valves 3 and 7 for the left and right traveling motors, and the hydraulic oil of the second hydraulic pump P2 is supplied to the control valves for the first and second working devices.
- the center bypass passage 2 of the first hydraulic pump P1 is supplied by the pilot signal pressure for switching the traveling straight valve 9 to supply the signal pressure corresponding to the traveling device operation signal to the unloading valve 50.
- a pilot valve 52 for closing the flow path flowing into the hydraulic tank T is supplied by the pilot signal pressure for switching the traveling straight valve 9 to supply the signal pressure corresponding to the traveling device operation signal to the unloading valve 50.
- the above-mentioned unloading valves 50 and 50a are operated by the hydraulic tank T in the center bypass passages 2 and 6 of the first and second hydraulic pumps P1 and P2 when switched by the pilot signal pressure from the outside.
- the hydraulic tank T in the center bypass passages 2 and 6 of the first and second hydraulic pumps P1 and P2 by the pressure formed in the center bypass passages 2 and 6 of the hydraulic pumps P1 and P2.
- poppets 54 and 54a (referred to as "negative poppets") to open and close the flow paths flowing through.
- the hydraulic tank T is formed in the valve spools 53 and 53a described above, and in the center bypass passages 2 and 6 of the first and second hydraulic pumps P1 and P2 when the attachment is finely operated in the pipe laying work mode. And notches 55 and 55a for linearly controlling passage closure to the furnace.
- the pressure of the first hydraulic pump P1 is determined by the pressure selected from the pilot signal pressure 1Pf on the side of the unloading valve 50 and the pressure downstream of the center bypass passage 2 of the first hydraulic pump P1. Downstream of the first shuttle valve 56 for controlling the tilt angle of the swash plate a, the pilot signal pressure 2Pf on the side of the unloading valve 50a, and the center bypass passage 6 of the second hydraulic pump P2. And a second shuttle valve 57 for controlling the tilt angle of the swash plate b of the second hydraulic pump P2 by a pressure selected from the side pressure.
- the hydraulic pressure including the first and second hydraulic pump (P1, P2), the main control valve (MCV) 16 and the operation mode switching valve 13, the attachment switching device (30, 40) connected to the engine (1) Since the circuit configuration is substantially the same as the hydraulic circuit configuration shown in FIG. 1, detailed descriptions of these configurations and operations are omitted, and the same reference numerals are used for overlapping circuit components.
- the operation only part discharged from the first hydraulic pump P1 is supplied to the control valve 3 through the center bypass passage 2, thereby driving the left traveling motor.
- a part of the hydraulic oil of the first hydraulic pump P1 is supplied to the control valve 7 via the flow path 25 and the traveling straight valve 9 in order to drive the right traveling motor.
- part of the hydraulic oil discharged from the second hydraulic pump P2 is supplied to the control valves 4 and 5 via the center bypass passage 6, the traveling straight valve 9, and the flow path 26 in order. Drive the swing motor and winch motor.
- a part of the hydraulic oil of the second hydraulic pump P2 is supplied to the control valve 8 via the center bypass passage 6 and the flow passage 27 in order to drive the boom cylinder.
- the hydraulic oil of the second hydraulic pump P2 hardly flows to the control valve 7.
- the first and second hydraulic pumps P1 and P2 described above are overloaded due to the occurrence of high pressure in the center bypass passages 2 and 6 blocked by the switching of the spool 15.
- the pilot signal pressure from the pilot pump P3 is blocked at the P port of the pilot valve 52, and from the attachment switching device 30 (work equipment operation signal) and 40;
- the operation signal Pi is not supplied to the unloading valves 50 and 50a through the pilot valve 52.
- the unloading valves 50 and 50a are kept open by the valve springs, so that the hydraulic oil discharged from the first and second hydraulic pumps P1 and P2 passes through the center bypass passages 2 and 6 and the unloading valves 50 and 50a. It passes through the P1 and P2 ports of the loading valves 50 and 50a in order, and is moved to the hydraulic tank T via the unloading valves 50 and 50a.
- the swash plate (a, b) tilt angles of the first and second hydraulic pumps P1 and P2 are controlled so that the flow rate discharged from the first and second hydraulic pumps P1 and P2 is minimized to prevent the occurrence of overload. .
- the working flow rate gradually decreases when moving from the center bypass passage 2 of the first hydraulic pump P1 to the hydraulic tank T via the unloading valve 50, with reference to FIGS. 4 and 5.
- the hydraulic oil discharged from the first hydraulic pump P1 flows into P1 of the valve block 64 through the P1 port of the unloading valve 50 in communication with the center bypass passage 2 thereof. .
- the hydraulic oil introduced into the valve block 64 passes through the orifice 65 of the valve spool 53 and the poppet 54 and moves toward the hydraulic tank T.
- the poppet 54 is moved downward in the drawing.
- the hydraulic oil from the first hydraulic pump P1 is supplied to the hydraulic tank T through the poppet 54 which is completely open.
- the operation signal (1 to 40kg / cm 2) through the Ps 2 port (or Ps 1 port) passes through the pilot valve 52 to correspond to the operation of the attachment switching device 40 (runner operation signal) described above. Since it is supplied to Pi port of 50), the spool is gradually moved upward in the drawing. As a result, the passage for moving the hydraulic oil passing through the P1 port of the valve block 64 toward the hydraulic tank T is closed little by little. At this time, the notch part 55 formed in the valve spool 53 linearly controls the closed opening area of the passage, so that the P1 port is connected to the P1 port from the center bypass passage 2 of the first hydraulic pump P1. After flowing into the unloading valve 50 through, the amount of hydraulic fluid flowing toward the hydraulic tank (T) is gradually reduced.
- the above-mentioned unloading valve (50, 50a) is formed in the left and right symmetrical type and operate in the same way, the flow path communicated to the hydraulic tank (T) in the center bypass passage (2) of the first hydraulic pump (P1) Only the unloading valve 50 provided in the above description is described, and the description of the unloading valve 50a connected to the center bypass passage 6 of the second hydraulic pump P2 is omitted, and the same configuration is referred to as "a". Add the reference numerals.
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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)
- Fluid-Pressure Circuits (AREA)
- Operation Control Of Excavators (AREA)
Abstract
Description
Claims (4)
- 유압펌프의 토출 유량을 네가티브 유량 제어시스템에 의해 제어하는 파이프 레이어용 유압회로에 있어서:엔진에 연결되는 제1,2유압펌프 및 파일럿 펌프와,상기 제1유압펌프의 센터바이패스통로에 설치되고, 절환시 좌측 주행모터 및 제1작업장치에 공급되는 작동유의 흐름 방향, 량을 각각 제어하는 제어밸브와,상기 제2유압펌프의 센터바이패스통로에 설치되고, 절환시 우측 주행모터 및 제2작업장치에 공급되는 작동유의 흐름 방향, 량을 각각 제어하는 제어밸브와,상기 제2유압펌프의 센터바이패스통로 상류측에 설치되고, 작업장치와 주행장치를 동시에 구동시키는 작업모드 선택시 파일럿 펌프로부터의 파일럿 신호압에 의해 절환되며, 절환시 제1유압펌프의 작동유를 좌측 및 우측 주행모터용 제어밸브에 각각 분배공급하고, 제2유압펌프의 작동유를 제1,2작업장치용 제어밸브에 각각 분배공급하는 주행 직진밸브와,파이프 레잉 작업모드에서 작업장치 또는 주행장치를 미세 조작시 제1,2유압펌프의 센터바이패스통로에서 각각 유압탱크로 흐르는 통로의 닫힘을 선형적으로 제어하는 언로딩 밸브와,상기 주행 직진밸브를 절환시키는 파일럿 신호압에 의해 절환되어, 주행장치 조작신호에 대응되는 신호압을 언로딩 밸브에 공급하여 제1유압펌프의 센터바이패스통로에서 유압탱크로 흐르는 유로를 닫히도록 하고, 작업장치 조작신호에 대응되는 신호압을 언로딩 밸브에 공급하여 제2유압펌프의 센터바이패스통로에서 유압탱크로 흐르는 유로를 닫히도록 하는 파일럿 밸브와,작업장치와 주행장치를 동시에 구동시키는 작업모드 선택시 외부로부터 전기적 신호의 입력에 따라 절환되고, 절환시 파일럿 펌프로부터의 파일럿 신호압을 주행 직진밸브, 파일럿 밸브와, 제1,2유압펌프의 센터바이패스통로 하류측에 설치된 밸브스풀에 각각 공급하는 작업모드 절환밸브를 포함하는 것을 특징으로 파이프 레이어용 유압회로.
- 제1항에 있어서, 상기 언로딩 밸브는,외부로부터의 파일럿 신호압에 의해 절환시 상기 제1,2유압펌프의 센터바이패스통로에서 유압탱크로 연통되는 통로의 닫히는 개구 단면적을 선형적으로 제어하는 밸브스풀과,상기 밸브스풀의 출구포트와 유압탱크사이의 유로에 설치되고, 상기 제1,2유압펌프의 센터바이패스통로에 형성되는 압력에 의해 상기 제1,2유압펌프의 센터바이패스통로에서 유압탱크로 흐르는 유로를 개폐시키는 포펫으로 이뤄지는 것을 특징으로 하는 파이프 레이어용 유압회로.
- 제2항에 있어서, 상기 밸브스풀에 형성되고, 파이프 레잉 작업모드에서 어태치먼트를 미세 조작시 제1,2유압펌프의 센터바이패스통로에서 유압탱크로 흐르는 통로 닫힘을 선형적으로 제어하는 노치부를 포함하는 것을 특징으로 하는 파이프 레이어용 유압회로.
- 제1항에 있어서, 상기 언로딩 밸브측 파일럿 신호압과, 제1유압펌프의 센터바이패스통로의 하류측 압력중 선택되는 압력에 의해 제1유압펌프의 사판 경전각을 제어하는 제1셔틀밸브와,상기 언로딩 밸브측 파일럿 신호압과, 제2유압펌프의 센터바이패스통로의 하류측 압력중 선택되는 압력에 의해 제2유압펌프의 사판 경전각을 제어하는 제2셔틀밸브를 포함하는 것을 특징으로 하는 파이프 레이어용 유압회로.
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/002,912 US9249812B2 (en) | 2011-03-07 | 2011-03-07 | Hydraulic circuit for pipe layer |
PCT/KR2011/001536 WO2012121427A1 (ko) | 2011-03-07 | 2011-03-07 | 파이프 레이어용 유압회로 |
JP2013557622A JP5711395B2 (ja) | 2011-03-07 | 2011-03-07 | パイプレイヤ用油圧回路 |
CN201180069093.8A CN103415709B (zh) | 2011-03-07 | 2011-03-07 | 用于管道铺设机的液压回路 |
KR1020137022907A KR101820324B1 (ko) | 2011-03-07 | 2011-03-07 | 파이프 레이어용 유압회로 |
EP11860149.1A EP2685110B1 (en) | 2011-03-07 | 2011-03-07 | Hydraulic circuit for pipe layer |
Applications Claiming Priority (1)
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PCT/KR2011/001536 WO2012121427A1 (ko) | 2011-03-07 | 2011-03-07 | 파이프 레이어용 유압회로 |
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WO2012121427A1 true WO2012121427A1 (ko) | 2012-09-13 |
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US (1) | US9249812B2 (ko) |
EP (1) | EP2685110B1 (ko) |
JP (1) | JP5711395B2 (ko) |
KR (1) | KR101820324B1 (ko) |
CN (1) | CN103415709B (ko) |
WO (1) | WO2012121427A1 (ko) |
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Also Published As
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JP5711395B2 (ja) | 2015-04-30 |
CN103415709B (zh) | 2016-01-20 |
US20130333367A1 (en) | 2013-12-19 |
EP2685110B1 (en) | 2016-09-14 |
KR20140034756A (ko) | 2014-03-20 |
JP2014508903A (ja) | 2014-04-10 |
CN103415709A (zh) | 2013-11-27 |
EP2685110A4 (en) | 2015-09-02 |
US9249812B2 (en) | 2016-02-02 |
KR101820324B1 (ko) | 2018-02-28 |
EP2685110A1 (en) | 2014-01-15 |
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