CN103842663A - Control system for operating work device for construction machine - Google Patents

Control system for operating work device for construction machine Download PDF

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Publication number
CN103842663A
CN103842663A CN201180073924.9A CN201180073924A CN103842663A CN 103842663 A CN103842663 A CN 103842663A CN 201180073924 A CN201180073924 A CN 201180073924A CN 103842663 A CN103842663 A CN 103842663A
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CN
China
Prior art keywords
control valve
swing arm
flow path
center bypass
driving
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201180073924.9A
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Chinese (zh)
Inventor
郑海均
宋永复
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Volvo Construction Equipment AB
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Volvo Construction Equipment AB
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Filing date
Publication date
Application filed by Volvo Construction Equipment AB filed Critical Volvo Construction Equipment AB
Publication of CN103842663A publication Critical patent/CN103842663A/en
Pending legal-status Critical Current

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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02FDREDGING; SOIL-SHIFTING
    • E02F9/00Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20Drives; Control devices
    • E02F9/22Hydraulic or pneumatic drives
    • E02F9/2278Hydraulic circuits
    • E02F9/2282Systems using center bypass type changeover valves
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02FDREDGING; SOIL-SHIFTING
    • E02F9/00Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20Drives; Control devices
    • E02F9/22Hydraulic or pneumatic drives
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02FDREDGING; SOIL-SHIFTING
    • E02F3/00Dredgers; Soil-shifting machines
    • E02F3/04Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/36Component parts
    • E02F3/42Drives for dippers, buckets, dipper-arms or bucket-arms
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02FDREDGING; SOIL-SHIFTING
    • E02F9/00Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/08Superstructures; Supports for superstructures
    • E02F9/10Supports for movable superstructures mounted on travelling or walking gears or on other superstructures
    • E02F9/12Slewing or traversing gears
    • E02F9/121Turntables, i.e. structure rotatable about 360°
    • E02F9/123Drives or control devices specially adapted therefor
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02FDREDGING; SOIL-SHIFTING
    • E02F9/00Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20Drives; Control devices
    • E02F9/22Hydraulic or pneumatic drives
    • E02F9/2217Hydraulic or pneumatic drives with energy recovery arrangements, e.g. using accumulators, flywheels
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02FDREDGING; SOIL-SHIFTING
    • E02F9/00Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20Drives; Control devices
    • E02F9/22Hydraulic or pneumatic drives
    • E02F9/2221Control of flow rate; Load sensing arrangements
    • E02F9/2225Control of flow rate; Load sensing arrangements using pressure-compensating valves
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02FDREDGING; SOIL-SHIFTING
    • E02F9/00Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20Drives; Control devices
    • E02F9/22Hydraulic or pneumatic drives
    • E02F9/2264Arrangements or adaptations of elements for hydraulic drives
    • E02F9/2267Valves or distributors
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02FDREDGING; SOIL-SHIFTING
    • E02F9/00Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20Drives; Control devices
    • E02F9/22Hydraulic or pneumatic drives
    • E02F9/2278Hydraulic circuits
    • E02F9/2285Pilot-operated systems
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02FDREDGING; SOIL-SHIFTING
    • E02F9/00Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20Drives; Control devices
    • E02F9/22Hydraulic or pneumatic drives
    • E02F9/2278Hydraulic circuits
    • E02F9/2292Systems with two or more pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/17Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/20Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205Systems with pumps
    • F15B2211/2053Type of pump
    • F15B2211/20546Type of pump variable capacity
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/20Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205Systems with pumps
    • F15B2211/20576Systems with pumps with multiple pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/30Directional control
    • F15B2211/31Directional control characterised by the positions of the valve element
    • F15B2211/3105Neutral or centre positions
    • F15B2211/3116Neutral or centre positions the pump port being open in the centre position, e.g. so-called open centre
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/30Directional control
    • F15B2211/31Directional control characterised by the positions of the valve element
    • F15B2211/3122Special positions other than the pump port being connected to working ports or the working ports being connected to the return line
    • F15B2211/3133Regenerative position connecting the working ports or connecting the working ports to the pump, e.g. for high-speed approach stroke

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Operation Control Of Excavators (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

Disclosed is a control system for controlling flow so as to allow simultaneous usage of a parallel flow path and a tandem flow path thereby reducing loss of pressure inside a control valve, when simultaneously operating work devices having different operating pressures. A control system for operating the work device, according to the present invention, provides the control system for operating the work device for a construction machine, comprising: first and second hydraulic pumps that are connected to an engine; a revolution control valve, an arm control valve, and a left driving control valve, which are installed on a first center bypass path of the first hydraulic pump, and each of which is connected via the parallel flow path; a boom control valve, a bucket control valve, and a right driving valve, which are installed on a second center bypass path of the second hydraulic pump, and each of which is connected via the parallel flow path; a pressure generation device; a bleed flow path, which is formed on a control spool at a lower side of a boom of the boom control valve, for maintaining an open state of the second center bypass path without closing same, when the boom control valve is switched so as to lower the boom; and a center bypass switch valve, which is installed on the lowermost side of the second center bypass path and is switched by means of a control signal for switching the boom control valve.

Description

Be used for the control system of the operation element device of construction plant
Technical field
The present invention relates to a kind of attachment arrangement driving control system for construction plant.More specifically, the present invention relates to a kind of attachment arrangement driving control system for construction plant, wherein, two attachment arrangements with different operating pressure simultaneously in driven situations (for example, for the situation of carrying out the swing arm of swing arm step-down operation and being driven such as the attachment arrangement of scraper bowl simultaneously), the flow of hydraulic fluid is controlled as and can uses parallel connection (parallel) flow path and series connection (tandem) flow path simultaneously, causes the pressure loss producing in control valve to reduce.
Background technique
Conventionally, as shown in Figure 1, comprise according to the traditional swing arm driving control system for construction plant of prior art:
Motor 1;
The first and second variable displacement hydraulic pump (hereinafter referred to " the first and second oil hydraulic pumps ") 2 and 3, the first and second oil hydraulic pumps 2 and 3 are connected to motor 1 and pioneer pump 4;
Control the driving of rotary motor 6 rotary control valve 7, control bucket arm cylinder 8 driving dipper control valve 9 and control the control valve 11 of advancing of the driving of left travel motor 10, wherein, rotary control valve, dipper control valve and the control valve of advancing are arranged in the first center bypass path 5 of the first oil hydraulic pump 2, to be connected respectively to flow path 5a in parallel;
Control the driving of boom cylinder 13 swing arm control valve 7, control bucket cylinder 15 driving scraper bowl control valve 16 and control the control valve 18 of advancing of the driving of right travel motor 17, wherein, swing arm control valve, scraper bowl control valve and the control valve of advancing are arranged in the second center bypass path 12 of the second oil hydraulic pump 3, to be connected respectively to flow path 12a in parallel; And
Pressure generation device 19 and 20, pressure generation device 19 and 20 outputs are corresponding to the control signal of manipulated variable.
When pressure generation device 19 is during in neutral position, the hydraulic fluid of discharging from the second oil hydraulic pump 3 is by the second center bypass path 12 and return to flow path 21 and turn back to hydraulic fluid tank T.
Handled for make swing arm rising in the situation that at pressure generation device 19, offered swing arm control valve 14 from the pilot signal pressure of pioneer pump 4 via pressure generation device 19.For this reason, swing arm control valve 14 is switched to the left side on drawing, so that swing arm rises, therefore, the hydraulic fluid of discharging from the second oil hydraulic pump 3 offers the large chamber of boom cylinder 13 via load safety check 22 and swing arm control valve 14.Now, the hydraulic fluid of outflow boom cylinder 13 cells turns back to hydraulic fluid tank T via swing arm control valve 14.Therefore, boom cylinder 13 is driven in the mode stretching, so that swing arm rises.
, handled for make swing arm decline in the situation that at pressure generation device 19 meanwhile, offered swing arm control valve 14 from the pilot signal pressure of pioneer pump 4 via pressure generation device 19.For this reason, swing arm control valve 14 is switched to the right side on drawing, so that swing arm declines, therefore, the hydraulic fluid of discharging from the second oil hydraulic pump 3 offers the cell of boom cylinder 13 via swing arm control valve 14.Now, the hydraulic fluid of outflow boom cylinder 13 large chambers turns back to hydraulic fluid tank T via swing arm control valve 14a and back pressure safety check 23.Therefore, boom cylinder 13 is driven in the mode of shrinking, so that swing arm declines.
In the case, back pressure safety check 23 is provided with valve spring, with convenient hydraulic fluid from it through out-of-date, form constant pressure.In addition, regeneration pipeline is arranged in back pressure safety check 23, so that in the decline process of swing arm, the hydraulic fluid that flows out boom cylinder 13 large chambers can be regenerated to the cell of boom cylinder 13 along regeneration pipeline.
As mentioned above, in the time that swing arm declines, due to by the step-down operation of himself weight, lower pressure acts on swing arm.Simultaneously, the swing arm for carrying out swing arm step-down operation with need to be than the attachment arrangement of the relative high operation pressure of the operation pressure of swing arm (for example, refer to scraper bowl) simultaneously in driven situation, (throttling arrangement is arranged on control guiding valve in swing arm decline side, refer to swing arm control valve 14) hydraulic fluid inlet port side place, to handle when can keeping swing arm and scraper bowl.
Meanwhile, throttling arrangement is arranged on relatively low pressure operation to produce in the flow path in parallel of each attachment arrangement that makes the pressure that swing arm rises, to handle when can realizing swing arm for carrying out lift operations on swing arm and another attachment arrangement.
In addition, series flow path is formed on scraper bowl control valve 16 and advances in control valve 18, and scraper bowl control valve 16 is connected with swing arm control valve 14 by the second center bypass path 12 abreast with the control valve 18 of advancing.; in the time that the driving of bucket cylinder 15 is controlled separately; hydraulic fluid from the second oil hydraulic pump 3 flows in scraper bowl control valve 16 by flow path 12a in parallel and series flow path, thereby reduces the excess pressure loss producing in the time that the hydraulic fluid from the second oil hydraulic pump 3 only flows in scraper bowl control valve 16 by flow path 12a in parallel.
Simultaneously, in the case of two different attachment arrangements of the swing arm such as for carrying out swing arm step-down operation and scraper bowl are driven simultaneously, control guiding valve blocking-up in the second center bypass path 12 passive arm decline sides, and hydraulic fluid only offers bucket cylinder 15 by flow path 12a in parallel.In the case, the preferential control valve that the problem of appearance is mounted in flow path 12a in parallel can not be guaranteed enough flow paths, thereby produces the excessive pressure loss, and therefore causes energy loss.
In addition, as throttle valve, 24(is shown in Fig. 2) variable control valve can be arranged in flow path 12a in parallel, use throttling arrangement to guarantee the restriction of flow path but exist.
Summary of the invention
Technical problem
Therefore, the present invention is intended to solve the problems referred to above that occur in prior art, and the object of this invention is to provide a kind of attachment arrangement driving control system for construction plant, wherein, in the situation that two attachment arrangements with different operating pressure are driven in swing arm step-down operation and scraper bowl operating process simultaneously, allow to flow in scraper bowl control valve by flow path in parallel and series flow path from the hydraulic fluid of the second oil hydraulic pump, cause the unnecessary pressure loss producing in control valve to reduce, reduce thus the efficiency that therefore energy loss also improves hydraulic system.
Technological scheme
In order to realize above object, provide a kind of according to the attachment arrangement driving control system for construction plant of the embodiment of the present invention, comprising:
Motor;
Be connected to the first variable displacement hydraulic pump and second variable displacement hydraulic pump of motor and pioneer pump;
Be configured to the driving of controlling rotary motor rotary control valve, be configured to the dipper control valve of the driving of controlling bucket arm cylinder and be configured to the control valve of advancing of the driving of controlling left travel motor, wherein, rotary control valve, dipper control valve and the control valve of advancing are arranged in the first center bypass path of the first oil hydraulic pump, to be connected respectively to flow path in parallel;
Be configured to the driving of controlling boom cylinder swing arm control valve, be configured to the scraper bowl control valve of the driving of controlling bucket cylinder and be configured to the control valve of advancing of the driving of controlling right travel motor, wherein, swing arm control valve, scraper bowl control valve and the control valve of advancing are arranged in the second center bypass path of the second oil hydraulic pump, to be connected respectively to flow path in parallel;
Pressure generation device, described pressure generation device is configured to the control signal of output corresponding to manipulated variable;
Discharge flow path, described discharge flow path is formed on the control guiding valve in the swing arm decline side of swing arm control valve, and be configured to when swing arm control valve be switched to by the manipulation of pressure generation device make swing arm decline time, keep the second center bypass path in open mode, instead of blocking-up the second center bypass path; And
Center bypass changing valve, described center bypass changing valve is arranged on the downstream side of the second center bypass path, and the control signal pressure that is configured to be used to switch swing arm control valve switches,
Wherein, in the time carrying out the swing arm of swing arm step-down operation and need to be driven than the attachment arrangement of the relative high operation pressure of the operation pressure of described swing arm simultaneously, from the hydraulic fluid of the second oil hydraulic pump by flow path in parallel be connected in the series flow path inflow swing arm control valve of the second center bypass path.
According to the preferred embodiment of the present invention, attachment arrangement is scraper bowl, and the control valve of control attachment arrangement is scraper bowl control valve.
Beneficial effect
As the attachment arrangement driving control system for construction plant according to the embodiment of the present invention of above configuration has the following advantages.
In the situation that two attachment arrangements with different operating pressure are driven in swing arm step-down operation and scraper bowl operating process simultaneously, allow from the hydraulic fluid of the second oil hydraulic pump by flow path in parallel and series flow path inflow scraper bowl control valve (, in the case, can guarantee that flow path picture through the flow of the hydraulic fluid in series flow path as many), cause the pressure loss producing in control valve to reduce, thereby reduce energy loss.
Brief description of the drawings
Fig. 1 is the hydraulic circuit diagram illustrating according to the attachment arrangement driving control system for construction plant of prior art;
Fig. 2 illustrates the zoomed-in view being applied to according to the critical piece of the variable control valve of the attachment arrangement driving control system for construction plant of prior art;
Fig. 3 is the hydraulic circuit diagram illustrating according to the attachment arrangement driving control system for construction plant of the embodiment of the present invention; And
Fig. 4 illustrates the zoomed-in view being applied to according to the critical piece of the pilot-actuated valve of the attachment arrangement driving control system for construction plant of the embodiment of the present invention.
The reference symbol explanation of primary component in figure
1: motor
2: the first oil hydraulic pumps
3: the second oil hydraulic pumps
4: pioneer pump
5: the first center bypass path
6: rotary motor
7,9,11,14,16,18: control valve
8: bucket arm cylinder
10,17: travel motor
13: boom cylinder
15: bucket cylinder
19,20: pressure generation device
25: discharge flow path (bleed flow path)
26: center bypass changing valve
Embodiment
Describe the preferred embodiments of the present invention in detail in connection with accompanying drawing now.Material defined in specification, for example concrete structure and element, be only the detail for helping the present invention of those of ordinary skill in the art's complete understanding to provide, and the present invention is not limited to hereinafter the disclosed embodiments.
As shown in Figures 3 and 4, comprise according to the attachment arrangement driving control system for construction plant of the embodiment of the present invention:
Motor 1;
The first and second variable displacement hydraulic pump (hereinafter referred to " the first and second oil hydraulic pumps ") 2 and 3, the first and second oil hydraulic pumps 2 and 3 are connected to motor 1 and pioneer pump 4;
Control the driving of rotary motor 6 rotary control valve 7, control bucket arm cylinder 8 driving dipper control valve 9 and control the control valve 11 of advancing of the driving of left travel motor 10, wherein, rotary control valve, dipper control valve and the control valve of advancing are arranged in the first center bypass path 5 of the first oil hydraulic pump 2, to be connected respectively to flow path 5a in parallel;
Control the driving of boom cylinder 13 swing arm control valve 7, control bucket cylinder 15 driving scraper bowl control valve 16 and control the control valve 18 of advancing of the driving of right travel motor 17, wherein, swing arm control valve, scraper bowl control valve and the control valve of advancing are arranged in the second center bypass path 12 of the second oil hydraulic pump 3, to be connected respectively to flow path 12a in parallel;
Pressure generation device 19 and 20, pressure generation device 19 and 20 outputs are corresponding to the control signal of manipulated variable;
Discharge flow path 25, discharge flow path 25 is formed on the control guiding valve in the swing arm decline side of swing arm control valve 14a, and when swing arm control valve 14a be switched to by the manipulation of pressure generation device 19 make swing arm decline time, keep the second center bypass path 12 in open mode, instead of blocking-up the second center bypass path; And
Center bypass changing valve 26, center bypass changing valve 26 is arranged on the downstream side of the second center bypass path 12, and the control signal pressure that is used to switch swing arm control valve 14a switches,
Therefore, when the swing arm of carrying out swing arm step-down operation with have than the attachment arrangement of the relative high operation pressure of swing arm operation pressure (, refer to scraper bowl) while being driven, flow in scraper bowl control valve 16 by flow path 12a in parallel and the series flow path that is connected to the second center bypass path 12 from the hydraulic fluid of the second oil hydraulic pump 3 simultaneously.
In the case, except being formed on the control guiding valve in the swing arm decline side of swing arm control valve 14a, and when swing arm control valve 14a be switched to by the manipulation of pressure generation device 19 make swing arm decline time, keep the second center bypass path 12 in open mode, instead of the discharge flow path 25 of blocking-up the second center bypass path
And be arranged on the downstream side of the second center bypass path 12, and be used to outside the center bypass changing valve 26 of the control signal pressure switching of switching swing arm control valve 14a, the configuration of the attachment arrangement driving control system shown in Fig. 3 is identical with the configuration of the attachment arrangement driving control system shown in Fig. 1.Therefore,, for fear of redundancy, the detailed description of its identical configuration and operation will be omitted, and same reference numeral represents similar elements.
Below describing in detail according to the usage example of the attachment arrangement driving control system for construction plant of the embodiment of the present invention in connection with accompanying drawing.
As shown in Figures 3 and 4, in the situation that the operation of swing arm step-down operation and scraper bowl is carried out simultaneously, response is by the pilot signal pressure from pioneer pump 4 of pressure process units 19, and swing arm control valve 14a is switched to the right side on drawing by the manipulation of pressure process units 19.The hydraulic fluid of therefore, discharging from the second oil hydraulic pump 3 offers the cell of boom cylinder 13 via load safety check 22 and swing arm control valve 14a.Meanwhile, the hydraulic fluid of outflow boom cylinder 13 large chambers turns back to hydraulic fluid tank T via swing arm control valve 14a and back pressure safety check 23.As a result, boom cylinder 13 is driven in the mode of shrinking, so that swing arm declines.
In the case, the hydraulic fluid that flows out boom cylinder 13 large chambers is partly regenerated to the cell of boom cylinder 13 by the upper regeneration pipeline forming of the control guiding valve (, referring to swing arm control valve 14a) in swing arm decline side.
The discharge flow path 25 that the hydraulic fluid of meanwhile, discharging from the second oil hydraulic pump 3 forms via the second center bypass path 12 and the control spool on the swing arm decline side of swing arm control valve 14a offers the inlet side of scraper bowl control valve 16.Therefore, discharge flow path 25 is connected to the guiding valve path of scraper bowl control valve 16 via the load safety check 27 of scraper bowl control valve 16.Meanwhile, converge the hydraulic fluid through load safety check 27 through the hydraulic fluid that is arranged on the preferential control valve on flow path 12a in parallel, then flow in the guiding valve of scraper bowl control valve 16.
In the time thering is the swing arm of different operating pressure and scraper bowl and driven simultaneously, flow in the guiding valve of scraper bowl control valve 16 by path 12a in parallel from the hydraulic fluid of the second oil hydraulic pump 3.Meanwhile, also flow in the guiding valve of scraper bowl control valve 16 by the second center bypass path 12 from the hydraulic fluid of the second oil hydraulic pump 3.For this reason, the pressure loss reduces with the flow that flows into the hydraulic fluid in the spool of scraper bowl control valve 16 by the second center bypass path 12 as many.Equally, the pressure loss of minimizing also may be used on the control valve 18 of advancing.
Industrial applicability
As mentioned above, be according to the advantage of the attachment arrangement driving control system for construction plant of the embodiment of the present invention, in the situation that two attachment arrangements with different operating pressure are driven in swing arm step-down operation and scraper bowl operating process simultaneously, allow to flow in scraper bowl control valve by flow path in parallel and series flow path from the hydraulic fluid of the second oil hydraulic pump, cause the pressure loss producing in control valve to reduce, improve thus the energy efficiency of hydraulic system.

Claims (2)

1. for an attachment arrangement driving control system for construction plant, comprising:
Motor;
Be connected to the first variable displacement hydraulic pump and second variable displacement hydraulic pump of described motor and pioneer pump;
Be configured to the driving of controlling rotary motor rotary control valve, be configured to the dipper control valve of the driving of controlling bucket arm cylinder and be configured to the control valve of advancing of the driving of controlling left travel motor, wherein, described rotary control valve, described dipper control valve and described in the control valve of advancing be arranged in the first center bypass path of described the first oil hydraulic pump, to be connected respectively to flow path in parallel;
Be configured to the driving of controlling boom cylinder swing arm control valve, be configured to the scraper bowl control valve of the driving of controlling bucket cylinder and be configured to the control valve of advancing of the driving of controlling right travel motor, wherein, described swing arm control valve, described scraper bowl control valve and described in the control valve of advancing be arranged in the second center bypass path of described the second oil hydraulic pump, to be connected respectively to flow path in parallel;
Pressure generation device, described pressure generation device is configured to the control signal of output corresponding to manipulated variable;
Discharge flow path, described discharge flow path is formed on the control guiding valve in the swing arm decline side of described swing arm control valve, and be configured to when described swing arm control valve be switched to by the manipulation of described pressure generation device make swing arm decline time, keep described the second center bypass path in open mode, instead of block described the second center bypass path; And
Center bypass changing valve, described center bypass changing valve is arranged on the downstream side of described the second center bypass path, and the control signal pressure that is configured to be used to switch described swing arm control valve switches,
Wherein, in the time carrying out the swing arm of swing arm step-down operation and need to be driven than the attachment arrangement of the relative high operation pressure of the operation pressure of described swing arm simultaneously, flow in described scraper bowl control valve by described flow path in parallel and the series flow path that is connected to described the second center bypass path from the hydraulic fluid of described the second oil hydraulic pump.
2. attachment arrangement driving control system as claimed in claim 1, wherein, described attachment arrangement is scraper bowl, and the control valve of controlling described attachment arrangement is scraper bowl control valve.
CN201180073924.9A 2011-10-07 2011-10-07 Control system for operating work device for construction machine Pending CN103842663A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/KR2011/007439 WO2013051740A1 (en) 2011-10-07 2011-10-07 Control system for operating work device for construction machine

Publications (1)

Publication Number Publication Date
CN103842663A true CN103842663A (en) 2014-06-04

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Country Status (6)

Country Link
US (1) US20140238010A1 (en)
EP (1) EP2772653A4 (en)
JP (1) JP5802338B2 (en)
KR (1) KR20140074306A (en)
CN (1) CN103842663A (en)
WO (1) WO2013051740A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104179738A (en) * 2014-08-07 2014-12-03 龙工(上海)精工液压有限公司 Open hydraulic system for glide loading machine
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CN104179738A (en) * 2014-08-07 2014-12-03 龙工(上海)精工液压有限公司 Open hydraulic system for glide loading machine
CN104179738B (en) * 2014-08-07 2016-04-13 龙工(上海)精工液压有限公司 A kind of sliding loader open type hydraulic system
CN113167056A (en) * 2018-12-13 2021-07-23 卡特彼勒Sarl Hydraulic control circuit for a work machine
CN113167056B (en) * 2018-12-13 2022-04-12 卡特彼勒Sarl Hydraulic control circuit for a work machine
JP2021107735A (en) * 2019-12-28 2021-07-29 株式会社クボタ Flow control valve
JP7305532B2 (en) 2019-12-28 2023-07-10 株式会社クボタ flow control valve

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JP2014534386A (en) 2014-12-18
EP2772653A4 (en) 2015-10-21

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Application publication date: 20140604