CN107663869A - Excavator - Google Patents
Excavator Download PDFInfo
- Publication number
- CN107663869A CN107663869A CN201710628283.8A CN201710628283A CN107663869A CN 107663869 A CN107663869 A CN 107663869A CN 201710628283 A CN201710628283 A CN 201710628283A CN 107663869 A CN107663869 A CN 107663869A
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- Prior art keywords
- pressure
- valve
- remote
- primary side
- control valve
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/28—Dredgers; 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
- E02F3/36—Component parts
- E02F3/42—Drives for dippers, buckets, dipper-arms or bucket-arms
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/28—Dredgers; 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
- E02F3/36—Component parts
- E02F3/42—Drives for dippers, buckets, dipper-arms or bucket-arms
- E02F3/43—Control of dipper or bucket position; Control of sequence of drive operations
-
- 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
-
- 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
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Operation Control Of Excavators (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The present invention provides a kind of excavator that can realize desired operation assisting.The excavator possesses：Multiple hydraulic unit drivers；Multiple directions control valve, control multiple hydraulic unit drivers each；Action bars, operate multiple hydraulic unit drivers；Multiple remote-controlled valves, the pilot port of each of multiple directions control valve is connected to, first pilot corresponding with the mode of operation of action bars is generated according to the first pilot inputted and exported to pilot port, thus controls each of multiple directions control valve；Multiple pressure-reducing valves, the primary side of each multiple remote-controlled valves is connected to, connection between primary side and oil tank and non-interconnected is switched according to the pressure of primary side, thus the guide's pressure inputted depressurized.
Description
Technical field
The application advocates the priority based on Japanese patent application filed in 29 days July in 2016 the 2016-150716th.
The full content that it is applied is by reference to being applied in this specification.
The present invention relates to a kind of excavator.
Background technology
Conventionally, there is known following crane：Its input side by the way that pressure-reducing valve to be connected to remote-controlled valve, to corresponding to swing arm
Rise and fall and depressurized with the pressure of the pilot valve of the volume of goods flow larger side in suspension hook elevator, disobey rod operation, keep suspension goods
Thing moves horizontally (for example, patent document 1).
Patent document 1：Japanese Unexamined Patent Publication 7-41287 publications
However, the pressure-reducing valve disclosed in patent document 1 is not the structure of the pressure of feedback secondary side, therefore presence can not be controlled
The possibility of the pressure of primary side processed.Also, the pressure-reducing valve disclosed in patent document 1 is not attached to oil tank, therefore presence can not
The possibility promptly depressurized to the guide's pressure inputted.Therefore, even if the structure disclosed in patent document 1 is applied to
It is required that the operating system of the excavator of accurate operation, there is also the possibility that can not realize desired operation assisting.
The content of the invention
Therefore, in view of above-mentioned problem, its object is to provide a kind of excavator that can realize desired operation assisting.
To achieve these goals, in an embodiment, there is provided a kind of excavator, it possesses：Multiple hydraulic unit drivers；It is more
Individual directional control valve, control the plurality of hydraulic unit driver each；Action bars, operate the multiple hydraulic unit driver；It is multiple
Remote-controlled valve, the pilot port of each of the multiple directional control valve is connected to, according to the first pilot generation inputted and institute
State the mode of operation of action bars and first pilot and export accordingly to the pilot port, thus control the multiple directional control valve
Each；And multiple pressure-reducing valves, the primary side of each the multiple remote-controlled valve is connected to, should according to the switching of the pressure of primary side
Connection between primary side and oil tank and non-interconnected, is thus depressurized to the pressure of primary side.
Invention effect
According to above-mentioned embodiment, using the teaching of the invention it is possible to provide a kind of excavator that can realize desired operation assisting.
Brief description of the drawings
Fig. 1 is the side view of one for representing excavator.
Fig. 2 is the figure of one for representing to drive the hydraulic circuit of the hydraulic unit driver of excavator.
Fig. 3 is the figure of one of guide's hydraulic circuit in the operating system for represent excavator.
Fig. 4 is the sectional view of one of the structure for showing schematically pressure-reducing valve.
Fig. 5 is the figure of the relation between action preferential when representing composition operation and the action limited.
Fig. 6 is other figure of guide's hydraulic circuit in the operating system for represent excavator.
In figure：10- controllers, 15- lower running bodies, 20- upper rotations, 21- swing arms, 21c- swing arm cylinders, 22- buckets
Bar, 22c- dipper cylinders, 23- scraper bowls, 23c- scraper bowl cylinders, 24- revolving bodies, 20m- revolution hydraulic motors, 30- controllers, 31,
31a, 31b- swing arm directional control valve, 32,32a, 32b- dipper directional control valve, 33- scraper bowl directional control valves, 34-
Revolution directional control valve, 35,35R, 35L- walking directional control valve, 36- straight ahead valves, the standby directional control valves of 37-,
38- stop valves, 40,40a, 40b- remote control valve cell, 41- swing arm remote-controlled valves, 42- dipper remote-controlled valves, 43- scraper bowls be remotely controlled
Valve, 44- revolution remote-controlled valves, 51- swing arm pressure-reducing valves, 52- dipper pressure-reducing valves, 53- scraper bowl pressure-reducing valves, 54- revolutions are used
Pressure-reducing valve, 51CV~54CV- check-valves, 100- excavators, P1, P2- hydraulic pump, Pg- pioneer pumps, RC1, RC2- center bypass oil
Road, the main hydraulic circuits of Cm-, Cr- remote control circuits.
Embodiment
Hereinafter, referring to the drawings, to being illustrated as the infinite embodiment illustrated of the present invention.
In addition, in record in all of the figs, it is identical or corresponding to identical or corresponding part or component mark
Reference symbol, and the repetitive description thereof will be omitted.Also, in accompanying drawing not for the purpose of representing comparing between part or component,
Specific size can compare following non-limiting embodiment, be determined by those skilled in the art.
First, with reference to figure 1, the basic structure of the excavator involved by present embodiment is illustrated.
Fig. 1 represents the side view of one of the excavator 100 involved by present embodiment.
Excavator 100 involved by present embodiment possesses：Swing arm 21, in the e axle supporting base end part of upper rotation 20；Bucket
Bar 22, e axle supporting is in the front end of swing arm 21；And scraper bowl 23, e axle supporting is in the front end of dipper 22.
Also, excavator 100 possesses swing arm cylinder 21c, the dipper cylinder 22c for driving swing arm 21, dipper 22 and scraper bowl 23 respectively
And scraper bowl cylinder 23c.Also, excavator 100 possesses：Rotary fluid motor (not shown), drive upper rotation 20；And walking
With motor (not shown), lower running body 15 is driven.Hereinafter, sometimes by swing arm cylinder 21c, dipper cylinder 22c, scraper bowl cylinder 23c, revolution
Hydraulic motor and walking are referred to as " hydraulic unit driver " with hydraulic motor.
Swing arm cylinder 21c is stretched by the working oil supplied by hydraulic circuit described later on long side direction, is stretched according to this
Contracting, swing arm 21 is driven in the vertical direction.Also, swing arm cylinder 21c passes through according to the action bars carried out by operator (operator)
Operational ton control swing arm with directional control valve 31 (with reference to figure 2), controlled flow and the flowing side of supplied working oil
To etc..That is, swing arm 21 is according to its action of the bar operational control carried out by operator.
Also, dipper cylinder 22c and scraper bowl cylinder 23c are identical with swing arm cylinder 21c, pass through the work supplied from hydraulic circuit described later
Stretched as oil, it is flexible according to this, dipper 22 and scraper bowl 23 are driven respectively.Dipper cylinder 22c and scraper bowl cylinder 23c pass through root respectively
The dipper controlled according to the operational ton of the action bars carried out by operator is controlled with directional control valve 32 (with reference to figure 2) and scraper bowl with direction
Valve 33 (with reference to figure 2) processed, is controlled flow and flow direction of supplied working oil etc..That is, dipper 22 and scraper bowl 23 is distinguished
Bar according to being carried out by operator operates, and controls its action.
Then, with reference to figure 2, to driving the hydraulic circuit (main hydraulic circuit Cm) of hydraulic unit driver of excavator 100 to carry out
Explanation.
Fig. 2 is to represent to drive hydraulic circuit (the main hydraulic pressure time of the hydraulic unit driver of the excavator involved by present embodiment
Road Cm) the figure of one.
Main hydraulic circuit Cm includes：Hydraulic pump P1, P2；Center bleed off circuit RC1, RC2；Parallel oil circuit PC1, PC2；Control
(swing arm is with directional control valve 31, dipper with directional control valve 32, scraper bowl directional control valve for the directional control valve of hydraulic unit driver
33rd, directional control valve 35 is used in revolution directional control valve 34, walking)；And other control valves (straight ahead valve 36, standby side
To control valve 37, stop valve 38).
Swing arm includes swing arm directional control valve 31a, 31b with directional control valve 31.
Dipper includes dipper directional control valve 32a, 32b with directional control valve 32.
Walking directional control valve 35 includes：Directional control valve 35L use in walking, control it is left with walking hydraulic motor (not
Diagram)；And walking directional control valve 35R, control right walking hydraulic motor (not shown).
The output axis connection of the power source such as hydraulic pump P1, P2 and engine (not shown), to the direction of control hydraulic unit driver
Control valve supplies working oil.
The working oil to be spued from hydraulic pump P1, P2 is recycled to oil tank T by bleed off circuit RC1, RC2 respectively at center.
Walking is configured with the bleed off circuit RC1 of center from hydraulic pump P1 sides (upstream side) successively tandem (series connection) to be controlled with direction
Valve 35L processed, standby directional control valve 37, revolution are controlled with directional control valve 34, swing arm with directional control valve 31b and dipper with direction
Valve 32a processed.
On the bleed off circuit RC2 of center straight ahead valve is configured with from hydraulic pump P2 sides (upstream side) successively tandem (series connection)
36th, walking with directional control valve 35R, scraper bowl with directional control valve 33, swing arm with directional control valve 31a, dipper direction controlling
Valve 32b and stop valve 38.
Also, walking directional control valve 35L, standby directional control valve 37, revolution directional control valve 34, swing arm side
Pass through parallel the oil circuit PC1 and hydraulic pressure from center bleed off circuit RC1 branches with directional control valve 32a to control valve 31b and dipper
Pump P1 is connected side by side.
Also, straight ahead valve 36, walking are controlled with directional control valve 35R, scraper bowl with directional control valve 33, swing arm with direction
Valve 31a and dipper processed pass through the parallel oil circuit PC2 and hydraulic pump P2 from center bleed off circuit RC2 branches with directional control valve 32b
Connection side by side.
Main hydraulic circuit Cm is by center bleed off circuit RC1, RC2, parallel oil circuit PC1, PC2 from hydraulic pump P1, P2 to drive
(swing arm is with directional control valve 31, dipper with directional control valve 32, scraper bowl direction controlling for the directional control valve of hydrodynamic pressure driver
Directional control valve 35 is used in valve 33, revolution directional control valve 34, walking) supply working oil.Specifically, hydraulic unit driver is driven
Directional control valve pressed according to the remote control (Remote control) of input to 2 pilot ports for being arranged at both ends, mobile valve
The position of core, to control the flow of supplied working oil and flow direction (that is, operating direction).Thereby, it is possible to realize to cut the earth
The desired action (operation) of machine 100.
Also, main hydraulic circuit Cm uses most upstream (that is, hydraulic pump P2 and the walking for being configured at center bleed off circuit RC2
With the oil circuit between directional control valve 36R) straight ahead valve 36, form and the working oil to be spued from 2 hydraulic pumps P1, P2 entered
The interflow loop Cmj at row interflow.That is, straight ahead valve 36 is for example driving standby operation attached by standby directional control valve 37
Part is (for example, grab bucket, mixer etc..Hereinafter referred to as " spare part ") when, by switching the work to be spued from hydraulic pump P1, P2
The supply target of oil, using interflow loop Cmj, 2 hydraulic pumps P1, P2 working oil are collaborated.Thus, main hydraulic circuit
Cm (excavator 100) can supply the working oil from hydraulic pump P1, P2 both sides' discharge to standby directional control valve 37.
In addition, straight ahead valve 36 allows hand over hydraulic pump P1, P2 each when being walked by lower running body 15
To walking with the state of directional control valve 35L, 35R each supply working oil and from hydraulic pump P1 to walking direction controlling
Valve 35L, 35R both sides supply the state of working oil.
Then, with reference to figure 3, to guide's hydraulic circuit (remote control (Remote in the operating system involved by present embodiment
Control) loop) illustrate.
Fig. 3 is represent guide's hydraulic circuit (remote control circuit Cr) in the operating system involved by present embodiment one
Figure.
Remote control circuit Cr possesses pioneer pump Pg, multiple remote-controlled valves (swing arm remote-controlled valve 41, dipper remote-controlled valve 42, scraper bowl
With remote-controlled valve 43, revolution remote-controlled valve 44), be connected to each remote-controlled valve primary side multiple pressure-reducing valves (swing arm pressure-reducing valve 51,
Dipper pressure-reducing valve 52, scraper bowl pressure-reducing valve 53, revolution pressure-reducing valve 54).
Pioneer pump Pg is connected to the output shaft of the power sources such as engine (not shown), generates from the remote control pressure of remote-controlled valve output
Press (first pilot) in source.
Remote-controlled valve 41~44 is pressed by 2 pilot ports supply remote control respectively to corresponding directional control valve 31~34,
To control all directions control valve 31~34.Remote-controlled valve 41~44 be 1 input 2 output, will input to primary side first pilot as
Source is pressed, and removes neutral condition, and any one party corresponding with the operation direction of bar into 2 output ports produces and operational ton phase
The remote control pressure answered.
Excavator 100 involved by present embodiment is can using the action bars of 4 directions (fore-and-aft direction and left and right directions)
To operate the structure of 2 hydraulic unit drivers.That is, include in the lever operating device (remote control valve cell 40) corresponding to 1 action bars
Control 2 remote-controlled valves of 2 directional control valves.Specifically, remote control valve cell 40 includes：It is remotely controlled valve cell 40a, including swing arm
With remote-controlled valve 41 and scraper bowl remote-controlled valve 43；And remote control valve cell 40b, including dipper is with remote-controlled valve 42 and revolution remote-controlled valve
44。
As described above, pressure-reducing valve 51~54 is connected to the primary side of remote-controlled valve 41~44.That is, pressure-reducing valve 51~54 is distinguished
The guide's oil circuit being arranged between pioneer pump Pg and remote-controlled valve 41~44.Pressure-reducing valve 51~54 passes through the pressure according to primary side
(that is, the pressure of feedback secondary side while), switch connection between primary side and oil tank T and non-interconnected, to the pressure of primary side
Power is depressurized.Also, pressure-reducing valve 51~54 is controlled according to being inputted from controller 10 to the controlling value of o (current value)
The setting pressure (upper pressure limiting) of primary side processed, is depressurized by as setting pressure in a manner of following to the pressure of primary side.Thus,
Can be to inputting to the first pilot of the primary side of remote-controlled valve 41~44, i.e. the source pressure for being remotely controlled pressure is depressurized, therefore can be suppressed
The action for the hydraulic unit driver that (limitation) operates relative to bar.
Also, pressure-reducing valve 51~54 possesses the oil circuit of connection (bypass) primary side and primary side and is arranged at the oil respectively
Check-valves (check valve) 51CV~54CV on road.Check-valves 51CV~54CV allows working oil from secondary lateral primary side respectively
Flowing, and block flowing of the working oil from primary lateral primary side.Thus, the main decompression work(of pressure-reducing valve 51~54 is maintained
Can, and because of certain reason, in the case that the pressure of primary side is higher than primary side, for example, when the pressure of primary side turns into low pressure,
Allow supply of the working oil from secondary lateral primary side, make the pressure of primary side reduce, can be set to and primary side identical pressure
Power.For example, in the power-off of excavator, engine as pioneer pump Pg power source etc. stops, pressure-reducing valve 51~54
The pressure of primary side declines, therefore by check-valves 51CV~54CV effect, declines the pressure of primary side, can be by primary
The pressure of side is set to identical.
Hereinafter, with reference to figure 4, the structure of pressure-reducing valve 51~54 is illustrated.
In addition, check-valves 51CV~54CV can also be omitted.
Fig. 4 is the sectional view of one of the structure for showing schematically swing arm pressure-reducing valve 51.
In addition, the structure of pressure-reducing valve 51~54 is all identical, thus by swing arm with the structure of pressure-reducing valve 51 as representative examples
To illustrate.
Swing arm included with pressure-reducing valve 51 mobile space 512 in the framework that valve element 511, valve element can move in axial direction,
O 513, the input port Pi of primary side, primary side output port Po, working oil is back to oil tank T oil tank
Port PT and spring 514.
The part of a sides (lower end side in figure) of the input port Pi with being provided with spring 514 in mobile space 512 connects
Connect.Hereinafter, the part being connected in mobile space 512 with input port Pi, referred to as input port Pi are also included sometimes.
Output port Po is connected with the part near the centre position of the moving direction of the valve element 511 in mobile space 512.
Hereinafter, output port Po will be referred to as including the part being connected in mobile space 512 with output port Po sometimes.
In addition, it is provided with to input port Pi (part specifically, being connected in mobile space 12 with input port Pi)
And the oil circuit bypassed between output port Po (part specifically, being connected in mobile space 512 with output port Po),
Check-valves 51CV is provided with the oil circuit.
Also, oil tank port PT, which is arranged in mobile space 512, is provided with the another side of o 513 (in figure
Upper end side).Hereinafter, oil tank port will be referred to as including the part being connected in mobile space 512 with oil tank port PT sometimes
PT。
Valve element 511 have it is generally cylindrical shaped, in mobile space 512, a side (upper end in figure) receive from electricity
The resistance of magnetic solenoid 513, another side (bottom in figure) receive the resistance from spring 514.
Also, on valve element 511 near the centre of the direction of principal axis of mobile space 512, it is provided with the generation with than valve element 511
Large-diameter portion 511a, 511b of the big external diameter of the external diameter of table.Large-diameter portion 511a external diameter and oil tank port PT in mobile space 512
The internal diameter of coupling part 512a between output port is roughly the same.Also, large-diameter portion 511b external diameter and mobile space 512
The internal diameter of coupling part 512b between middle input port Pi and output port Po is roughly the same.Therefore, large-diameter portion 511a according to
The movement of the upward direction of valve element 511, be inserted into the coupling part 512a of mobile space 512, thus, it is possible to by output port Po with
It is set to non-interconnected between the PT of oil tank port.Also, movements of the large-diameter portion 511b according to valve element 511 in downward direction, is inserted into movement
The coupling part 512b in space 512, thus, it is possible to which non-interconnected state will be set between output port Po and input port Pi.
What large-diameter portion 511a, 511b were connected with keeping output port Po with input port Pi and oil tank port PT any one party
The interval setting of state.
In addition, Fig. 4 depicts the state that large-diameter portion 511a is inserted into the coupling part 512a of mobile space 512, output end
Mouth Po and oil tank port PT turns into non-interconnected.
Here, illustrated using Fig. 4 structures being depressurized to output port Po pressure.
In addition, illustrated on the premise of large-diameter portion 511b external diameter is more than large-diameter portion 511a.Also, from spring
On the premise of 514 are more than the downward power loaded from o 513 to valve element 511 to the upward power that valve element 511 loads
Illustrate.
The power in lower direction in the figure from o 513 is loaded with valve element 511.Also, from spring on valve element 511
514 are loaded with the power in upper direction in figure.Also, as described above, large-diameter portion 511b is more than large-diameter portion 511a, therefore according to output port
Po pressure, the power for acting on large-diameter portion 511b upper surface are more than the power for the lower surface for acting on large-diameter portion 511a.That is, valve element
Power downward in figure corresponding with output port Po pressure is loaded with 511.
If being risen according to output port Po pressure, it is carried on power downward in the figure of valve element 511 and becomes big, and be more than from electricity
Magnetic solenoid 513 and spring 514 be carried in the figure of valve element 511 it is upward make a concerted effort, then valve element 511 moves down into figure.Cause
This, oil tank port PT and output port Po turns into connected state, and output port Po working oil is discharged to oil tank T, output port
Po pressure is depressurized.
On the other hand, if output port Po connects with oil tank port PT, output port Po pressure is depressurized, then with output
Port Po pressure gradually decreases to the downward power of valve element 511 accordingly.Therefore, if according to output port Po pressure, bear
The downward power for being loaded in valve element 511 is less than and from o 513 and spring 514 is carried on conjunction upward in the figure of valve element 511
Power, then valve element 511 move up, output port Po and oil tank port PT turn into non-interconnected state, and output port Po with it is defeated
Inbound port Pi turns into connected state.Thus, working oil is supplied to output port Po, output port Po pressure from input port Pi
Rise.
In this way, pressure-reducing valve 51 has the pressure according to output port Po, output port Po and oil tank port PT can be switched
Connection and non-interconnected structure, thereby, it is possible to promptly output port Po pressure is depressurized.
Also, in this example, when output port Po connects with oil tank port PT, output port Po turns into input port Pi
Non-interconnected, when output port Po connects with input port Pi, output port Po and oil tank port PT turns into non-interconnected.Therefore, subtract
Pressure valve 51 can be depressurized more promptly to output port Po pressure, and even in the output port for making to be depressurized
In the case that Po pressure returns to the pressure of primary side, also can promptly it recover.That is, pressure-reducing valve 51 can further be improved
Response.
In addition, when the pressure to output port Po depressurizes, i.e. connected between output port Po and oil tank port PT
When, it can also be connected between output port Po and input port Pi.
Also, controller 10 can be reduced from o by improving supply to the current value of o 513
513 and spring 514 be carried in the figure of valve element 511 upward make a concerted effort.That is, controller 10 is by further improving supply to electromagnetism
The current value of solenoid 513, it can further reduce above-mentioned setting pressure.Therefore, controller 10 passes through control input to electromagnetism
The current value of solenoid 513, the degree for the action for suppressing hydraulic unit driver can be controlled.
Fig. 3 is returned to, as described above, pressure-reducing valve 51~54 is connected to the primary side of corresponding remote-controlled valve 41~44, therefore built-in
2 decompressions corresponding with 2 built-in remote-controlled valves are connected with the remote control valve cell 40 of 2 remote-controlled valves in remote-controlled valve 41~44
Valve.In this example, 2 pressure-reducing valves are built in remote control valve cell 40.That is, it is integrally formed with remote control valve cell 40.It is specific and
Speech, depressurized in built-in swing arm with swing arm is integrally built-in with the remote control valve cell 40a of remote-controlled valve 41 and scraper bowl with remote-controlled valve 43
Valve 51 and scraper bowl pressure-reducing valve 53.Also, built-in dipper is with the remote control valve cell 40b of remote-controlled valve 42 and revolution remote-controlled valve 44
Integrally it is built-in with dipper pressure-reducing valve 52 and revolution pressure-reducing valve 54.Thus, without using connection pressure-reducing valve 51~54 and remote control
Hydraulic hose between valve 41~44 etc., it is possible to increase operating efficiency when space efficiency and excavator 100 manufacture etc..
Then, the specific method that the action of hydraulic unit driver is controlled using pressure-reducing valve 51~54 is illustrated with reference to figure 5.
Fig. 5 is the figure of the relation between action preferential when representing composition operation and the action limited.
In this example, in the case of the composite move for include the action of swing arm 21, the preferential action for carrying out swing arm 21,
Suppress the action of (limitation) other operation important documents (dipper 22, scraper bowl 23, rotary fluid motor or spare part).Hereinafter, it is right
(1) concrete example of~(4) illustrates.
In addition, input has operational ton from detectable action bars and the sensor in operation direction (not in controller 10
Diagram) signal on the premise of illustrate.
(1) light load shovel sandy soil
In the case of the operation for carrying out shovel sandy soil, carry out being lifted the bar operation of swing arm 21 while closing dipper 22.Now,
Dipper 22 works because the effect of deadweight, dipper cylinder 22c load become smaller, therefore compared with loading larger swing arm cylinder 21c
Oil readily flows to dipper cylinder 22c.Especially, when gently loading (when the excavation load for scraper bowl 23 is smaller), the effect is obvious, therefore
There is swing arm 21 can not fully be lifted and operability deterioration.
Therefore, controller 10 carries out operation corresponding with shovel sandy soil operation, i.e. lifting is dynamic while close dipper 22
In the case of the bar operation of arm 21, the preferential action (boom arm lift action) for carrying out swing arm 21, suppress the dynamic of (limitation) dipper 22
Make (dipper closing motion).Specifically, if controller 10 is judged as carrying out according to the signal from the sensor simultaneously
Lift the bar operation of swing arm 21 and close the bar operation of dipper 22, then input electric current to the electric solenoid of dipper pressure-reducing valve 52
Pipe, is depressurized to dipper with the pressure of the primary side of remote-controlled valve 42.Thus, the action of dipper 22 is limited, therefore can be preferential
Working oil is supplied to swing arm cylinder 21c, the desired operability for following operator can be realized.
In addition, sensor of the controller 30 using the load condition such as detection scraper bowl 23, can when being judged as gently loading
To limit the action of dipper 22.
(2) scraper bowl closes ＆ boom arm lifts (latter half of digging operation)
In the latter half of digging operation, the bar operation of swing arm 21 is lifted while close scraper bowl 23.Now, scraper bowl
23 be supported on excavates that latter half is smaller, and scraper bowl directional control valve 33 is configured at main hydraulic circuit Cm upstream side (liquid
Press pump P2 sides), therefore working oil readily flows to scraper bowl cylinder 23c.Accordingly, there exist can not fully lift swing arm 21 and operational deterioration
Possibility.
Moreover, in the case that controller 10 lifts the bar operation of swing arm 21 while scraper bowl 23 close, preferentially
The action (boom arm lift action) of swing arm 21 is carried out, suppresses the action of (system limit) scraper bowl 23.Specifically, if controller 10 according to
Signal from the sensor, it is judged as having carried out the bar operation for the bar operation and closing scraper bowl 23 for lifting swing arm 21 simultaneously,
Then electric current is inputted to the o of scraper bowl pressure-reducing valve 53, scraper bowl is subtracted with the pressure of the primary side of remote-controlled valve 43
Pressure.Thus, the action of scraper bowl 23 is limited, therefore preferentially can be supplied working oil to swing arm cylinder 21c, can realize and follow operation
The desired operability of person.
(3) lifting revolution
Carry out in the case of slinging revolution action, carry out the bar behaviour for turning round upper rotation 20 while lifting swing arm 4
Make.Now, excavate rear bucket 23 to be stained with the state of sandy soil, lift swing arm 21, and carry out revolution action, therefore on swing arm 21
It is applied with larger load.Therefore, working oil readily flows to the relatively low rotary fluid motor of duty factor, as a result, in the presence of dynamic
In the state of arm 21 can not be lifted fully, upper rotation 20 is turned round and the possibility of operability deterioration.
Moreover, controller 10 carried out lifted swing arm 21 and make upper rotation 3 turn round bar operation in the case of,
The preferential action (boom arm lift action) for carrying out swing arm 21, suppress the revolution action of (limitation) upper rotation 3.Specifically,
If controller 10, according to the signal from the sensor, the bar for being judged as having carried out lifting swing arm 21 simultaneously operates and makes top
The bar operation that revolving body 20 turns round, then input electric current to the o of revolution pressure-reducing valve 54, to revolution remote-controlled valve
The pressure of 44 primary side is depressurized.Thus, revolution action is limited, therefore preferentially can be supplied working oil to swing arm cylinder
21c, therefore the desired operability for following operator can be realized.
(4) drive during spare part (when mixer is installed especially)
When needing the spare part of working oil of big flow with light load driving (when especially, installing mixer), if entering
The bar operation of row lifting swing arm 4, then working oil readily flows to the hydraulic unit driver of spare part.Therefore, because swing arm 4 can not be abundant
Lifting, or from making the bar that swing arm 4 declines that interval etc. occur when operating transition, there is operability deterioration.
Therefore, it is preferential to carry out in the case that controller 10 has carried out the bar operation of lifting swing arm 4 when spare part drives
The action (boom arm lift action) of swing arm 21, suppress the action of (limitation) spare part.Specifically, if controller 10 is according to next
From the signal of the sensor, it is judged as having carried out the operation for the bar operation and driving spare part for lifting swing arm 21 simultaneously, then
Electric current is inputted to the o of standby pressure-reducing valve (not shown), to the pressure of the primary side of standby remote-controlled valve (not shown)
Depressurized.Thus, the action of spare part is limited, therefore preferentially can be supplied working oil to swing arm cylinder 21c, can be realized
Follow the desired operability of operator.
In this way, in present embodiment, according to the pressure of primary side, switch the connection between primary side and oil tank and non-company
It is logical, thus the pressure-reducing valve depressurized to the pressure of primary side is connected to the primary side of remote-controlled valve, followed so as to realize
Operation assisting desired by operator.
More than, the mode for implementing the present invention is described in detail, but to be not limited to this specific by the present invention
Embodiment, various modifications, change can be carried out in the range of described purport of the invention in detail in the claims.
For example, in above-mentioned embodiment, be built in remote control valve cell 40 (40a, 40b) 2 remote-controlled valves each
2 pressure-reducing valves of primary side connection be integrally built in the remote control valve cell 40, but as shown in fig. 6, can be with being remotely controlled valve cell
40 are provided separately.
Claims (5)
1. a kind of excavator, it possesses：
Multiple hydraulic unit drivers；
Multiple directions control valve, control the plurality of hydraulic unit driver each；
Action bars, operate the multiple hydraulic unit driver；
Multiple remote-controlled valves, the pilot port of each of the multiple directional control valve is connected to, according to the first pilot inputted
Generation first pilot corresponding with the mode of operation of the action bars is simultaneously exported to the pilot port, thus controls the multiple side
To each of control valve；And
Multiple pressure-reducing valves, be connected to the primary side of each the multiple remote-controlled valve, according to the pressure of primary side switch the primary side with
Connection between oil tank and non-interconnected, is thus depressurized to the pressure of primary side.
2. excavator according to claim 1, it possesses the distant of 2 remote-controlled valves included by built-in the multiple remote-controlled valve
Control valve cell,
2 pressure-reducing valves of 2 remote-controlled valves corresponded to the remote control valve cell, configuration in the multiple pressure-reducing valve.
3. excavator according to claim 2, wherein,
The remote control valve cell is integrally formed with 2 pressure-reducing valves.
4. according to excavator according to any one of claims 1 to 3, wherein,
Each the multiple pressure-reducing valve relative to primary side to guide's pressure of primary side when depressurizing, by primary side and primary side
It is maintained connected state.
5. according to excavator according to any one of claims 1 to 4, wherein,
The multiple hydraulic unit driver includes the annex beyond the hydraulic unit driver and the driving swing arm of driving swing arm
Other hydraulic unit drivers,
The multiple pressure-reducing valve is carrying out operating the compound of one hydraulic unit driver and other hydraulic unit drivers simultaneously
During operation, carried out to inputting to the guide of the remote-controlled valve for corresponding to other hydraulic unit drivers in the multiple remote-controlled valve to press
Decompression.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2016150716A JP6682396B2 (en) | 2016-07-29 | 2016-07-29 | Excavator |
| JP2016-150716 | 2016-07-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107663869A true CN107663869A (en) | 2018-02-06 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710628283.8A Pending CN107663869A (en) | 2016-07-29 | 2017-07-28 | Excavator |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP6682396B2 (en) |
| CN (1) | CN107663869A (en) |
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| Publication number | Publication date |
|---|---|
| JP2018017100A (en) | 2018-02-01 |
| JP6682396B2 (en) | 2020-04-15 |
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