CN103717914A - Hydraulic control system for construction machinery - Google Patents
Hydraulic control system for construction machinery Download PDFInfo
- Publication number
- CN103717914A CN103717914A CN201180072647.XA CN201180072647A CN103717914A CN 103717914 A CN103717914 A CN 103717914A CN 201180072647 A CN201180072647 A CN 201180072647A CN 103717914 A CN103717914 A CN 103717914A
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- China
- Prior art keywords
- dipper
- controlling rod
- hydraulic pump
- scraper bowl
- oil hydraulic
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Classifications
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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
- E02F9/2235—Control of flow rate; Load sensing arrangements using one or more variable displacement pumps 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
- E02F9/2004—Control mechanisms, e.g. control levers
-
- 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
- F15B11/17—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
- 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
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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
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
- F15B2211/7051—Linear output members
- F15B2211/7053—Double-acting output members
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/8593—Systems
- Y10T137/85978—With pump
- Y10T137/85986—Pumped fluid control
Landscapes
- 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
The present invention relates to a hydraulic control system for construction machinery capable of supplying a working fluid from a hydraulic pump to both an arm cylinder and a bucket cylinder and operating same, while performing a complex operation such as excavation by simultaneously operating an arm operating device and a bucket operating device. The hydraulic control system comprises: a first arm control valve installed in a passage between a first hydraulic pump and the arm cylinder, for controlling the driving, stopping, and directional switching of the arm cylinder when the first arm control valve is switched according to a manipulation of the arm operating device; a second arm control valve installed in a passage between a second hydraulic pump and the arm cylinder, for being switched to join and supply a flow discharged from the second hydraulic pump to the arm cylinder when a control signal according to the manipulation of the arm operating device exceeds a set value; a bucket control valve installed in a passage between the second hydraulic pump and the bucket cylinder, for controlling the driving, stopping, and directional switching of the bucket cylinder when the bucket control valve is switched according to a manipulation of the bucket operating device; and a joining cancellation valve installed in a passage between the second hydraulic pump and the second arm control valve.
Description
Technical field
The present invention relates to a kind of hydraulic control system for construction plant.More particularly, the present invention relates to a kind of hydraulic control system for construction plant, it can be such as operate in the process of the combined operations such as excacation of dipper controlling rod and scraper bowl controlling rod simultaneously, by hydraulic fluid is fed to bucket arm cylinder and bucket cylinder from corresponding oil hydraulic pump, operate bucket arm cylinder and bucket cylinder.
Background technique
As shown in Figure 1, the hydraulic control system for construction plant of prior art comprises:
A pair of first and second become displacement hydraulic pump (being below called " oil hydraulic pump ") 1 and 2;
Bucket arm cylinder 3, it is connected to the first oil hydraulic pump 1;
Bucket cylinder (not shown), it is connected to the second oil hydraulic pump 2;
Dipper controlling rod 4 and scraper bowl controlling rod (not shown), it is exported according to the control signal of operation amount;
The first dipper control valve 5, it is arranged in the flow path between the first oil hydraulic pump 1 and bucket arm cylinder 3, and is switched, with the operation in response to dipper controlling rod 4, control bucket arm cylinder 3 starting, stop and commutating;
The second dipper control valve 6, it is arranged in the flow path between the second oil hydraulic pump 2 and bucket arm cylinder 3, and if surpass setting value according to the control signal of the operation of dipper controlling rod 4, be switched, so that the exudate hydraulic fluid of the second oil hydraulic pump 2 is converged with the hydraulic fluid of bucket arm cylinder 3 to be supplied; And
Scraper bowl control valve (not shown), it is arranged in the path between the second oil hydraulic pump 2 and bucket cylinder (not shown), and is switched, with the operation in response to scraper bowl controlling rod, control bucket cylinder starting, stop and commutating.
Therefore, by operate dipper and scraper bowl and carry out excacation in the situation that simultaneously, the control signal that the operation that the first dipper control valve 5 drives according to the execution " dipper effect (arm-in) " by dipper controlling rod 4 produces, along the dextrad in accompanying drawing, switch, and the hydraulic fluid of therefore discharging from the first oil hydraulic pump 1 is fed to the large chamber 3a of bucket arm cylinder 3 via the first dipper control valve 5 having switched.Now, the hydraulic fluid refluxing from the loculus 3b of bucket arm cylinder 3 turns back to hydraulic fluid tank T via the first dipper control valve 5.
If the operation amount of dipper controlling rod 4 surpasses predetermined value, the second dipper control valve 6 switches along left-hand in accompanying drawing, and therefore from the hydraulic fluid of the second oil hydraulic pump 2, via the second dipper control valve 6 having switched, converges to be supplied with the hydraulic fluid of the loculus 2a of bucket arm cylinder 2.
On the other hand, although accompanying drawing is not shown, bucket cylinder can be by the operation due to scraper bowl controlling rod and from the hydraulic fluid of the second oil hydraulic pump 2 supplies.
Therefore,, during operating at the same time the combined operation of dipper and scraper bowl, bucket arm cylinder 3 can be by the hydraulic fluid to converge each other from the first and second oil hydraulic pumps 1 and 2 discharges.
As mentioned above, by operate dipper and scraper bowl simultaneously and carry out excacation in the situation that (generally speaking, the load that the load ratio producing in bucket arm cylinder 3 sides produces in bucket cylinder side is relatively large), from the first and second oil hydraulic pumps 1 and 2 hydraulic fluids of discharging, converge each other, and be fed to bucket arm cylinder 3 to drive bucket arm cylinder, and the hydraulic fluid of discharging from the second oil hydraulic pump 2 is only fed to bucket cylinder to drive bucket cylinder.Now, though owing to acting on external load on bucket arm cylinder 3 or bucket cylinder in the situation that produce load in the side in bucket arm cylinder 3 and bucket cylinder, the first and second oil hydraulic pumps 1 and 2 discharge pressure also increase conventionally.Due to this reason, produced the pressure loss, and this has a negative impact to fuel efficiency.
Summary of the invention
technical problem
Therefore, the present invention is devoted to solve the problems referred to above that occur in prior art, an embodiment of the invention relate to a kind of hydraulic control system for construction plant, during its excacation that can simultaneously operate at dipper and scraper bowl, by removing combining functions and making hydraulic fluid be fed to respectively bucket arm cylinder and bucket cylinder from corresponding oil hydraulic pump, prevent the pressure loss of oil hydraulic pump.
technological scheme
According to an aspect of the present invention, provide a kind of hydraulic control system for construction plant, it comprises:
First and second become displacement hydraulic pump;
Bucket arm cylinder, described bucket arm cylinder is connected to described the first oil hydraulic pump;
Bucket cylinder, described bucket cylinder is connected to described the second oil hydraulic pump;
Dipper controlling rod and scraper bowl controlling rod, described dipper controlling rod and described scraper bowl controlling rod are configured to output according to the control signal of its operation amount;
The first dipper control valve, described the first dipper control valve is arranged in the flow path between described the first oil hydraulic pump and described bucket arm cylinder, and is switched, with the operation in response to described dipper controlling rod, control described bucket arm cylinder starting, stop and commutating;
The second dipper control valve, described the second dipper control valve is arranged in the flow path between described the second oil hydraulic pump and described bucket arm cylinder, and if surpass setting value according to the control signal of the operation of described dipper controlling rod, be switched, so that the exudate hydraulic fluid of described the second oil hydraulic pump is converged with the hydraulic fluid of described bucket arm cylinder to be supplied;
Scraper bowl control valve, described scraper bowl control valve is arranged in the path between described the second oil hydraulic pump and described bucket cylinder, and is switched, with the operation in response to described scraper bowl controlling rod, control described bucket cylinder starting, stop and commutating; And
Cut-out Proportional valve confluxes, the described cut-out Proportional valve that confluxes is arranged in the path between described the second oil hydraulic pump and described the second dipper control valve, and if the discharge pressure of described the first and second oil hydraulic pumps surpasses predefined value, be switched, to cut off confluxing from described second hydraulic fluid of oil hydraulic pump discharge and the exudate hydraulic fluid of described the first oil hydraulic pump.
According to a further aspect of the invention, provide a kind of hydraulic control system, it comprises:
First and second become displacement hydraulic pump; Bucket arm cylinder, described bucket arm cylinder is connected to described the first oil hydraulic pump; Bucket cylinder, described bucket cylinder is connected to described the second oil hydraulic pump; Dipper controlling rod and scraper bowl controlling rod, the output of described dipper controlling rod and described scraper bowl controlling rod according to the control signal of its operation amount; The first dipper control valve, described the first dipper control valve is controlled the hydraulic fluid that is supplied to described bucket arm cylinder according to the operation of described dipper controlling rod; The second dipper control valve, if surpass setting value according to the control signal of the operation of described dipper controlling rod, described the second dipper control valve is controlled the hydraulic fluid that is fed to described bucket arm cylinder from described the second oil hydraulic pump; Scraper bowl control valve, described scraper bowl control valve is controlled the driving to described bucket cylinder according to the operation of described scraper bowl controlling rod; And the cut-out Proportional valve that confluxes, if described bucket arm cylinder operates separately, the cut-out Proportional valve that confluxes converges the hydraulic fluid of described the second oil hydraulic pump and the exudate hydraulic fluid of described the first oil hydraulic pump, if described bucket arm cylinder and described bucket cylinder operate simultaneously,, conflux and cut off Proportional valve cut-out combining functions, described hydraulic control system comprises:
First step, reads dipper effect control signal according to the operation amount of described dipper controlling rod, according to the discharge pressure of the scraper bowl effect control signal of the operation amount of described scraper bowl controlling rod and described the first and second oil hydraulic pumps;
Second step, determines whether described dipper effect control signal surpasses a setting value and whether described scraper bowl effect control signal surpasses a described setting value;
Third step, whether the discharge pressure whether discharge pressure of determining described the first oil hydraulic pump surpasses another setting value and described the second oil hydraulic pump surpasses described another setting value; And
The 4th step, if described dipper effect control signal and described scraper bowl effect control signal surpass the discharge pressure of a described setting value and described the first and second oil hydraulic pumps and surpass described another setting value,, by the cut-out Proportional valve that conflux described in being applied to described dipper effect control signal and the proportional control signal of described scraper bowl effect control signal, remove combining functions.
When described dipper controlling rod and described scraper bowl controlling rod operate simultaneously,
Described confluxing cuts off Proportional valve and can under the first state that cuts off flow path, operate, when described dipper controlling rod operates separately, described in conflux and cut off Proportional valve and can under the second state that connects flow path, operate.
The described cut-out Proportional valve that confluxes
Operation in Ke first portion, second portion and third part, wherein in first portion, amount of exercise is controlled as with the operation amount of described dipper controlling rod and described scraper bowl controlling rod and increases progressively pro rata to remove combining functions, in second portion, along with the increase of the operation amount of described dipper controlling rod and described scraper bowl controlling rod and maintain the dissengaged positions that confluxes, in third part, thereby the operation amount that amount of exercise is controlled as with described dipper controlling rod and described scraper bowl controlling rod successively decreases and is switched to combining functions inversely proportionally.
The described cut-out Proportional valve that confluxes can comprise:
Solenoid valve, described solenoid valve is switched with the opening/closing flow path in response to the input of electrical signal.
The described cut-out Proportional valve that confluxes can comprise:
Electric proportional control valve, described electric proportional control valve is switched with opening/closing flow path according to the input of electrical signal.
beneficial effect
According to the present invention, the hydraulic control system for construction plant of many aspects has the following advantages.
When operating dipper and scraper bowl and complete excacation simultaneously, make hydraulic fluid be fed to bucket arm cylinder and bucket cylinder from corresponding oil hydraulic pump, and the pressure loss that therefore can prevent oil hydraulic pump is to improve fuel efficiency.
Accompanying drawing explanation
Fig. 1 is the hydraulic circuit diagram of the hydraulic control system for construction plant of the prior art;
Fig. 2 is the hydraulic circuit diagram of the hydraulic control system for construction plant according to an embodiment of the present invention;
Fig. 3 be illustrate according to an embodiment of the present invention be used for controlling the flow chart for the method for the hydraulic control system of construction plant; And
Fig. 4 is the plotted curve of the operation of explaining that confluxing of the hydraulic control system for construction plant according to an embodiment of the present invention cut off Proportional valve.
Embodiment
Below, the preferred embodiment of the present invention is described in detail with reference to the accompanying drawings in detail.The object that such as detailed structure and element etc. limits in embodiment, is only to provide with helping the thorough understanding of those skilled in the art detail of the present invention, and the present invention is not limited to below disclosed mode of execution.
As shown in Figure 2, according to an embodiment of the present invention, a kind of hydraulic control system for construction plant comprises:
First and second become displacement hydraulic pump (being below called " oil hydraulic pump ") 1 and 2;
Bucket arm cylinder 3, it is connected to the first oil hydraulic pump 1;
Bucket cylinder (not shown), it is connected to the second oil hydraulic pump 2;
Dipper controlling rod 4 and scraper bowl controlling rod (not shown), it is exported according to the control signal of operation amount;
The first dipper control valve 5, it is arranged in the flow path between the first oil hydraulic pump 1 and bucket arm cylinder 3, and is switched, with the operation in response to dipper controlling rod 4, control bucket arm cylinder 3 starting, stop and commutating;
The second dipper control valve 6, it is arranged in the flow path between the second oil hydraulic pump 2 and bucket arm cylinder 3, and if surpass setting value according to the control signal of the operation of dipper controlling rod 4, be switched, so that the exudate hydraulic fluid of the second oil hydraulic pump 2 is converged with the hydraulic fluid of bucket arm cylinder 3 to be supplied;
Scraper bowl control valve (not shown), it is arranged in the path between the second oil hydraulic pump 2 and bucket cylinder, and is switched, with the operation in response to scraper bowl controlling rod, control bucket cylinder starting, stop and commutating; And
Conflux and cut off Proportional valve 8, it is arranged in the path 7 between the second oil hydraulic pump 2 and the second dipper control valve 6, and if the discharge pressure of the first and second oil hydraulic pumps 1 and 2 surpasses predefined value, be switched, to cut off confluxing from the second oil hydraulic pump 2 hydraulic fluids of discharge and the exudate hydraulic fluid of the first oil hydraulic pump 1.
Another mode of execution according to the present invention,
A kind of hydraulic control system is provided, and it comprises: first and second become displacement hydraulic pump 1 and 2; Bucket arm cylinder 3, it is connected to the first oil hydraulic pump 1; Bucket cylinder (not shown), it is connected to the second oil hydraulic pump 2; Dipper controlling rod 4 and scraper bowl controlling rod (not shown), it is exported according to the control signal of its operation amount; The first dipper control valve 5, the hydraulic fluid that is supplied to bucket arm cylinder 3 is controlled in its operation according to dipper controlling rod 4; The second dipper control valve 6, if surpass setting value according to the control signal of the operation of dipper controlling rod 4, the second dipper control valve 6 is controlled the hydraulic fluid that is fed to bucket arm cylinder 3 from the second oil hydraulic pump 2; Scraper bowl control valve (not shown), the driving to bucket cylinder is controlled in its operation according to scraper bowl controlling rod; And the cut-out Proportional valve 8 that confluxes, if bucket arm cylinder 3 operates separately, the cut-out Proportional valve 8 that confluxes converges the hydraulic fluid of the second oil hydraulic pump 2 and the exudate hydraulic fluid of the first oil hydraulic pump 1, if bucket arm cylinder 3 and bucket cylinder operate simultaneously, conflux and cut off Proportional valve 8 cut-out combining functions, described hydraulic control system comprises:
First step S100, reads dipper effect control signal according to the operation amount of dipper controlling rod 4, according to the discharge pressure of scraper bowl effect (bucket-in) control signal of the operation amount of scraper bowl controlling rod and the first and second oil hydraulic pumps 1 and 2;
Second step S200, determines whether dipper effect control signal surpasses a setting value Ap and whether scraper bowl effect control signal surpasses described setting value Ap;
Third step S300, whether the discharge pressure whether discharge pressure of determining the first oil hydraulic pump 1 surpasses another setting value Bp and the second oil hydraulic pump 2 surpasses described another setting value Bp; And
The 4th step S400, if described dipper effect control signal and described scraper bowl effect control signal surpass the discharge pressure of a described setting value Ap and the first and second oil hydraulic pumps 1 and 2 and surpass described another setting value Bp, by being applied to conflux to described dipper effect control signal and the proportional control signal of described scraper bowl effect control signal, cut off Proportional valve 8, remove combining functions.
When dipper controlling rod 4 and scraper bowl controlling rod operate simultaneously, conflux and cut off Proportional valve 8 and operate under the first state I of cutting off flow path 7,
When dipper controlling rod operates separately, the cut-out Proportional valve 8 that confluxes operates under the second state I I that connects flow path 7.
Conflux and cut off Proportional valve 8
Amount of exercise be controlled as operation amount with dipper controlling rod 4 and scraper bowl controlling rod increase progressively pro rata to remove in the combining functions first portion (a) of (conflux and cut off the second state I I of Proportional valve 8), along with the increase of the operation amount of dipper controlling rod 4 and scraper bowl controlling rod, maintain the dissengaged positions that confluxes (conflux and cut off the first state I of Proportional valve 8) second portion (b) thus in and amount of exercise be controlled as operation amount with dipper controlling rod 4 and scraper bowl controlling rod inversely proportional successively decrease and be switched to operation in the combining functions third part (c) of (conflux and cut off the second state I I of Proportional valve 8).
The cut-out Proportional valve 8 that confluxes can comprise:
Solenoid valve, described solenoid valve is switched with the opening/closing flow path 7 in response to the input of electrical signal.
The cut-out Proportional valve 8 that confluxes can comprise:
Electric proportional control valve, described electric proportional control valve is switched with opening/closing flow path 7 according to the input of electrical signal.
preferred forms
Below, will the usage example of the hydraulic control system for construction plant according to an embodiment of the present invention be described.
As shown in Figure 2, in the situation that dipper operates separately, the first dipper control valve 5 operates the control signal producing and switches along accompanying drawing dextrad according to the dipper effect by dipper controlling rod 4, and therefore according to the operation amount of dipper controlling rod 4, from the hydraulic fluid Q1 of the first oil hydraulic pump 1 discharge, is supplied to the large chamber 3a of bucket arm cylinder 3 via the first dipper control valve 5 having switched.Now, the hydraulic fluid refluxing from the loculus 3b of bucket arm cylinder 3 turns back to hydraulic fluid tank T via the first dipper control valve 5.
If the operation amount of dipper controlling rod 4 surpasses predetermined value, the second dipper control valve 6 switches along accompanying drawing left-hand, and the hydraulic fluid of the large chamber 2a that the hydraulic fluid Q2 therefore discharging from the second oil hydraulic pump 2 cuts off Proportional valve 8 and the second dipper control valve 6 and the second oil hydraulic pump 2 via confluxing in order converges (the hydraulic fluid total amount that is supplied in this case, the large chamber 3a of bucket arm cylinder 3 becomes (Q1+Q2)).
Therefore, when dipper operates separately, from the hydraulic fluid Q2 of the second oil hydraulic pump 2 supplies and the hydraulic fluid Q1 that is fed to bucket arm cylinder 3 from the first oil hydraulic pump 1, converge (Q1+Q2), the service speed of bucket arm cylinder 3 can improve.
Although accompanying drawing is not shown, bucket cylinder can be by the operation due to scraper bowl controlling rod and from the hydraulic fluid of the second oil hydraulic pump 2 supplies.
On the other hand, if surpass setting value according to the control signal input of the operation of dipper controlling rod 4 and scraper bowl controlling rod (not shown) and the discharge pressure value of the first and second oil hydraulic pumps 1 and 2, think that actual excavation work completes, and controller (not shown) outputs to by electric control signal (for cutting off the control signal of confluxing of the hydraulic fluid of the first and second oil hydraulic pumps 1 and 2) the cut-out Proportional valve 8 that confluxes.
By like this, conflux and cut off Proportional valve 8 along the downward direction switching in accompanying drawing, to cut off flow path (being arranged on the supply side flow path between the second oil hydraulic pump 2 and the second dipper control valve 6), and therefore from the hydraulic fluid of the second oil hydraulic pump 2, no longer can converge with the hydraulic fluid of the first oil hydraulic pump 1.Also be, hydraulic fluid from the first oil hydraulic pump 1 is fed to bucket arm cylinder 3 via the first dipper control valve 5, simultaneously, hydraulic fluid from the second oil hydraulic pump 2 is fed to bucket cylinder (now, being supplied to the hydraulic fluid of bucket cylinder in the situation that be not supplied with the operation interference of bucket arm cylinder 3) via scraper bowl control valve (not shown).
Below, describe with reference to the accompanying drawings the hydraulic control system for construction plant of another mode of execution according to the present invention, wherein by confluxing, cut off Proportional valve and remove combining functions.
In the step S100 of Fig. 3, read dipper effect control signal according to the operation amount of dipper controlling rod 4, according to the discharge pressure of the scraper bowl effect control signal of the operation amount of scraper bowl controlling rod and the first and second oil hydraulic pumps 1 and 2.
In S200, determine whether dipper effect control signal surpasses a setting value Ap and whether scraper bowl effect control signal surpasses described setting value Ap.
At S300, whether the discharge pressure whether discharge pressure of determining the first oil hydraulic pump 1 surpasses another setting value Bp and the second oil hydraulic pump surpasses described another setting value Bp.
At S400, if described dipper effect control signal and described scraper bowl effect control signal surpass the discharge pressure of a described setting value Ap and the first and second oil hydraulic pumps 1 and 2 and surpass described another setting value Bp, by the load in identification bucket arm cylinder 3 and bucket cylinder, occur, determine that actual excavation work completes.
By like this, be applied to conflux from controller to dipper effect control signal and the proportional electric control signal of scraper bowl effect control signal and cut off Proportional valve 8, confluxing, cut off Proportional valve 8 and switch to the first state I, and therefore the flow path 7 between the second oil hydraulic pump 2 and the second dipper control valve 6 is cut off.
Now, being applied to the control signal S that cuts off Proportional valve 8 that confluxes can be expressed by following formula:
S=(dipper effect operation amount * C) and (scraper bowl effect operation amount * D).
At this, C and D excavate the constant predetermined amount of the work that is applied to that condition selects according to difference.
As shown in Figure 4, conflux cut off Proportional valve 8 in amount of exercise is controlled as the first portion (a) that operation amount with dipper controlling rod 4 and scraper bowl controlling rod increases progressively to remove combining functions pro rata, along with the increase of the operation amount of dipper controlling rod 4 and scraper bowl controlling rod, maintain the dissengaged positions that confluxes second portion (b) thus in and amount of exercise be controlled as operation amount with dipper controlling rod 4 and scraper bowl controlling rod and successively decrease to be switched in the third part (c) of combining functions inversely proportionally and operate.
Therefore, by operate bucket arm cylinder 3 and bucket cylinder and carry out excacation in the situation that simultaneously, by cut off Proportional valve 8 cut-out flow paths 7 by means of confluxing, remove combining functions, and therefore the hydraulic fluid of the second oil hydraulic pump 2 no longer can converge with the hydraulic fluid of discharging from the first oil hydraulic pump 1.
Also be, operate at the same time dipper and scraper bowl to carry out in the situation of excacation, hydraulic fluid from the first oil hydraulic pump 1 is fed to the large chamber 3a of bucket arm cylinder 3 via the first dipper control valve 5, meanwhile, the hydraulic fluid from the second oil hydraulic pump 2 is fed to the large chamber of bucket cylinder via scraper bowl control valve.
As mentioned above, foundation is according to the hydraulic control system for construction plant of embodiment of the present invention, by operate dipper and scraper bowl and complete excacation in the situation that simultaneously, with in bucket arm cylinder and bucket cylinder, need respectively the corresponding hydraulic fluid of power from corresponding oil hydraulic pump, be fed to bucket arm cylinder and bucket cylinder, and the pressure loss that therefore can prevent oil hydraulic pump is to improve fuel efficiency.
industrial applicability
As is clear from the above, according to the hydraulic control system for construction plant of embodiment of the present invention, can be used for excavator or loader, by operate dipper and scraper bowl and complete excacation in the situation that simultaneously, make hydraulic fluid be fed to bucket arm cylinder and bucket cylinder from corresponding oil hydraulic pump, and the pressure loss that therefore can prevent oil hydraulic pump is to improve fuel efficiency.
Claims (6)
1. for a hydraulic control system for construction plant, comprising:
First and second become displacement hydraulic pump;
Bucket arm cylinder, described bucket arm cylinder is connected to described the first oil hydraulic pump;
Bucket cylinder, described bucket cylinder is connected to described the second oil hydraulic pump;
Dipper controlling rod and scraper bowl controlling rod, described dipper controlling rod and described scraper bowl controlling rod are configured to output according to the control signal of the operation amount of described dipper controlling rod and described scraper bowl controlling rod;
The first dipper control valve, described the first dipper control valve is arranged in the flow path between described the first oil hydraulic pump and described bucket arm cylinder, and is switched, with the operation in response to described dipper controlling rod, control described bucket arm cylinder starting, stop and commutating;
The second dipper control valve, described the second dipper control valve is arranged in the flow path between described the second oil hydraulic pump and described bucket arm cylinder, and if surpass setting value according to the control signal of the operation of described dipper controlling rod, be switched, so that the exudate hydraulic fluid of described the second oil hydraulic pump is converged with the hydraulic fluid of described bucket arm cylinder to be supplied;
Scraper bowl control valve, described scraper bowl control valve is arranged in the path between described the second oil hydraulic pump and described bucket cylinder, and is switched, with the operation in response to described scraper bowl controlling rod, control described bucket cylinder starting, stop and commutating; And
Cut-out Proportional valve confluxes, the described cut-out Proportional valve that confluxes is arranged in the path between described the second oil hydraulic pump and described the second dipper control valve, and if the discharge pressure of described the first and second oil hydraulic pumps surpasses predefined value, be switched, to cut off confluxing from described second hydraulic fluid of oil hydraulic pump discharge and the exudate hydraulic fluid of described the first oil hydraulic pump.
2. a hydraulic control system, it comprises: first and second become displacement hydraulic pump; Bucket arm cylinder, described bucket arm cylinder is connected to described the first oil hydraulic pump; Bucket cylinder, described bucket cylinder is connected to described the second oil hydraulic pump; Dipper controlling rod and scraper bowl controlling rod, described dipper controlling rod and the output of described scraper bowl controlling rod are according to the control signal of the operation amount of described dipper controlling rod and described scraper bowl controlling rod; The first dipper control valve, described the first dipper control valve is controlled the hydraulic fluid that is supplied to described bucket arm cylinder according to the operation of described dipper controlling rod; The second dipper control valve, if surpass setting value according to the control signal of the operation of described dipper controlling rod, described the second dipper control valve is controlled the hydraulic fluid that is fed to described bucket arm cylinder from described the second oil hydraulic pump; Scraper bowl control valve, described scraper bowl control valve is controlled the driving to described bucket cylinder according to the operation of described scraper bowl controlling rod; And the cut-out Proportional valve that confluxes, if described bucket arm cylinder operates separately, the cut-out Proportional valve that confluxes converges the hydraulic fluid of described the second oil hydraulic pump and the exudate hydraulic fluid of described the first oil hydraulic pump, if described bucket arm cylinder and described bucket cylinder operate simultaneously,, conflux and cut off Proportional valve cut-out combining functions, described hydraulic control system comprises:
First step, reads dipper effect control signal according to the operation amount of described dipper controlling rod, according to the discharge pressure of the scraper bowl effect control signal of the operation amount of described scraper bowl controlling rod and described the first and second oil hydraulic pumps;
Second step, determines whether described dipper effect control signal surpasses a setting value and whether described scraper bowl effect control signal surpasses a described setting value;
Third step, whether the discharge pressure whether discharge pressure of determining described the first oil hydraulic pump surpasses another setting value and described the second oil hydraulic pump surpasses described another setting value; And
The 4th step, if described dipper effect control signal and described scraper bowl effect control signal surpass the discharge pressure of a described setting value and described the first and second oil hydraulic pumps and surpass described another setting value,, by the cut-out Proportional valve that conflux described in being applied to described dipper effect control signal and the proportional control signal of described scraper bowl effect control signal, remove combining functions.
3. hydraulic control system as claimed in claim 1, wherein, when described dipper controlling rod and described scraper bowl controlling rod operate simultaneously, the described cut-out Proportional valve that confluxes operates under the first state that cuts off flow path, when described dipper controlling rod operates separately, described in conflux and cut off Proportional valve and operate under the second state that connects flow path.
4. hydraulic control system as claimed in claim 2, wherein, described confluxing cut off Proportional valve in first portion, operation in second portion and third part, wherein in first portion, amount of exercise is controlled as with the operation amount of described dipper controlling rod and described scraper bowl controlling rod and increases progressively pro rata to remove combining functions, in second portion, along with the increase of the operation amount of described dipper controlling rod and described scraper bowl controlling rod and maintain the dissengaged positions that confluxes, in third part, thereby the operation amount that amount of exercise is controlled as with described dipper controlling rod and described scraper bowl controlling rod successively decreases and is switched to combining functions inversely proportionally.
5. hydraulic control system as claimed in claim 1, wherein, described in conflux and cut off Proportional valve and comprise solenoid valve, described solenoid valve is switched with the opening/closing flow path in response to the input of electrical signal.
6. hydraulic control system as claimed in claim 1, wherein, described in conflux and cut off Proportional valve and comprise electric proportional control valve, described electric proportional control valve is switched with opening/closing flow path according to the input of electrical signal.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/KR2011/005790 WO2013022131A1 (en) | 2011-08-09 | 2011-08-09 | Hydraulic control system for construction machinery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103717914A true CN103717914A (en) | 2014-04-09 |
| CN103717914B CN103717914B (en) | 2016-05-11 |
Family
ID=47668625
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201180072647.XA Expired - Fee Related CN103717914B (en) | 2011-08-09 | 2011-08-09 | For the hydraulic control system of construction machinery |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US20140158235A1 (en) |
| EP (1) | EP2743517A4 (en) |
| JP (1) | JP5771332B2 (en) |
| KR (1) | KR20140050030A (en) |
| CN (1) | CN103717914B (en) |
| WO (1) | WO2013022131A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111465738A (en) * | 2017-12-14 | 2020-07-28 | 沃尔沃建筑设备公司 | Hydraulic machine |
| CN111501893A (en) * | 2020-04-30 | 2020-08-07 | 徐州徐工挖掘机械有限公司 | Negative flow hydraulic system and excavator |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BR112014016207A8 (en) | 2012-01-02 | 2017-07-04 | Volvo Constr Equip Ab | method for controlling debris movement for a construction machine including an undercarriage, an upper oscillating structure mounted on the undercarriage to oscillate according to an operation of an oscillating joystick, a cab mounted on an oscillating structure top, and a clamp including a barrier clamped to a front end of the top swing structure to be actuated according to a clamp joystick operation |
| DE112012006316B4 (en) | 2012-06-04 | 2023-07-06 | Volvo Construction Equipment Ab | Drive control method for a construction machine |
| KR101741703B1 (en) | 2013-01-24 | 2017-05-30 | 볼보 컨스트럭션 이큅먼트 에이비 | Device and method for controlling flow rate in construction machinery |
| KR20150005752A (en) * | 2013-07-04 | 2015-01-15 | 현대중공업 주식회사 | Hydraulic Circuit Providing Float Function |
| JP5975073B2 (en) * | 2014-07-30 | 2016-08-23 | コベルコ建機株式会社 | Construction machinery |
| GB2547959B (en) | 2016-01-08 | 2020-07-08 | Cummins Inc | Communication interface for start-stop systems and methods |
| JP6807399B2 (en) | 2016-09-21 | 2021-01-06 | 株式会社小松製作所 | Work vehicle and flood control method |
| CN110861225A (en) * | 2019-11-26 | 2020-03-06 | 中铁十一局集团第二工程有限公司 | Cutting method of tunnel lining |
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- 2011-08-09 WO PCT/KR2011/005790 patent/WO2013022131A1/en active Application Filing
- 2011-08-09 EP EP20110870643 patent/EP2743517A4/en not_active Withdrawn
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2014522952A (en) | 2014-09-08 |
| CN103717914B (en) | 2016-05-11 |
| JP5771332B2 (en) | 2015-08-26 |
| EP2743517A1 (en) | 2014-06-18 |
| WO2013022131A1 (en) | 2013-02-14 |
| KR20140050030A (en) | 2014-04-28 |
| EP2743517A4 (en) | 2015-04-08 |
| US20140158235A1 (en) | 2014-06-12 |
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