CN103993623B - Excavator, bucket hydraulic system thereof and method for controlling bucket excavating speed of excavator - Google Patents
Excavator, bucket hydraulic system thereof and method for controlling bucket excavating speed of excavator Download PDFInfo
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- CN103993623B CN103993623B CN201410227924.5A CN201410227924A CN103993623B CN 103993623 B CN103993623 B CN 103993623B CN 201410227924 A CN201410227924 A CN 201410227924A CN 103993623 B CN103993623 B CN 103993623B
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000001514 detection method Methods 0.000 claims abstract description 6
- 239000003921 oil Substances 0.000 claims description 131
- 238000009412 basement excavation Methods 0.000 claims description 23
- 239000007788 liquid Substances 0.000 claims description 13
- 239000010720 hydraulic oil Substances 0.000 claims description 5
- 239000002828 fuel tank Substances 0.000 claims description 4
- 239000012530 fluid Substances 0.000 claims description 2
- 230000005611 electricity Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 5
- 238000005065 mining Methods 0.000 description 5
- 230000005484 gravity Effects 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
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Abstract
The invention discloses an excavator, a bucket hydraulic system thereof and a method for controlling the excavating speed of a bucket thereof, wherein the bucket hydraulic system of the excavator comprises a bucket hydraulic cylinder (1) and a reversing valve (2), the bucket hydraulic cylinder (1) is connected with a main oil inlet oil way (3) and a main oil return oil way (4) through the reversing valve (2), the bucket hydraulic system of the excavator further comprises a control system, the control system comprises a control device and a pressure sensor (5), the pressure sensor (5) is connected with a rodless cavity of the bucket hydraulic cylinder (1) to detect the pressure in the rodless cavity, the control device is connected with the pressure sensor (5), when the rodless cavity of the bucket hydraulic cylinder (1) is filled with oil and the rod cavity returns oil, the control device controls the oil return flow rate of the rod cavity of the bucket (1) according to the detection value of the pressure sensor (5), to control the digging speed of the excavator bucket.
Description
Technical field
The present invention relates to engineering machinery field, in particular it relates to a kind of power shovel hydraulic system, excavator and control
The method of power shovel excavation speed.
Background technology
Hydraulic crawler excavator is the restoration in earth-rock construction machinery of a kind of discontinuous running, and its work process is: with the cutting edge of scraper bowl
Cutting soil, scraper bowl promotes after filling, returns back to unload soil position, and the scraper bowl after unstowing returns excavation position and starts next time
Operation.It is widely used in fields such as building, transportation, minings, to extensively application.
In the cycle of operation of excavator, mining process load is big, and power consumption is many, the mining ability of scraper bowl and excavation effect
Rate is most important.Fig. 1 shows a kind of power shovel hydraulic system of the prior art, should including bucket cylinder 1 ' and control
The scraper bowl banked direction control valves 2 ' of bucket cylinder 1 ' stretching motion, wherein, when the piston rod of bucket cylinder 1 ' stretches out, scraper bowl excavates
Action, when the piston rod of bucket cylinder 1 ' is retracted, scraper bowl carries out uninstall action.In mining process, scraper bowl may be made at gravity
Glide with lower acceleration, during the delivery rate of the rodless cavity that gliding speed exceedes bucket cylinder 1 ', rodless cavity will be caused to be emptied, thus
Causing scraper bowl in unfavorable phenomenons such as gravity midline position pauses, above-mentioned scraper bowl banked direction control valves 2 ' of the prior art is provided with oil return joint
Discharge orifice 3 ' or regeneration check valve, thus the steady excavation of scraper bowl is realized by throttle grverning or throttling regeneration, but so can
Limit scraper bowl rod chamber oil return flow velocity of bucket cylinder 1 ' in mining process, so that excavation speed declines；Additionally, due to joint
Stream effect, pressure and the excavation back pressure of bucket cylinder 1 ' rod chamber can increase, and cause digging force to reduce and power dissipation is serious.
In consideration of it, be necessary to provide a kind of novel power shovel hydraulic system, to overcome or alleviated by drawbacks described above.
Summary of the invention
It is an object of the present invention to provide a kind of power shovel hydraulic system, this power shovel hydraulic system can
Control the excavation speed of described power shovel.
It is a further object to provide a kind of excavator, this excavator uses the power shovel that the present invention provides
Hydraulic system.
It is also another object of the present invention to provide a kind of method controlling power shovel excavation speed, the method can have
Effect ground controls the excavation speed of described power shovel.
To achieve these goals, the present invention provides a kind of power shovel hydraulic system, including bucket hydraulic cylinder with change
To valve, the rodless cavity of this bucket hydraulic cylinder and rod chamber are connected with main oil-feed oil circuit and main oil return circuit by described reversal valve respectively
Connecing, wherein, described power shovel hydraulic system also includes that control system, described control system include controlling device and pressure passes
Sensor, described pressure transducer is connected with the rodless cavity of described bucket hydraulic cylinder, to detect this nothing when described rodless cavity oil-feed
Pressure in bar chamber, described control device is connected with described pressure transducer, described bucket hydraulic cylinder rodless cavity oil-feed and
During rod chamber oil return, described control device controls the rod chamber of described bucket hydraulic cylinder according to the detected value of described pressure transducer
Oil return flow velocity, to control the excavation speed of described power shovel.
Preferably, described control device includes controller and flow controlling unit, and described flow controlling unit can be at joint
Stream oil circuit position and un-throttled oil circuit position between switch, described pressure transducer and described flow controlling unit respectively with described control
Device connects, and when the detected value of described pressure transducer is less than the value preset, described controller makes described flow controlling unit
Being in throttling oil circuit position, when the detected value of described pressure transducer is more than described default value, described controller makes described
Flow controlling unit is in un-throttled oil circuit position.
Preferably, described flow controlling unit is electromagnetic flow control valve, and the rod chamber of described bucket hydraulic cylinder is by the
One working oil path is connected with described reversal valve, and described electromagnetic flow control valve is arranged in described first working oil path.
Preferably, described first working oil path is parallel with check valve, and the oil-in of described check valve is with described reversal valve even
Connecing, oil-out is connected with the rod chamber of described bucket hydraulic cylinder.
Preferably, described flow controlling unit includes solenoid directional control valve and liquid flow control control valve, described bucket hydraulic cylinder
Rod chamber be connected with described reversal valve by the first working oil path, described liquid flow control control valve is arranged on described first and works
On oil circuit, the automatically controlled end of described pressure transducer and described solenoid directional control valve is connected with described controller respectively, and described electromagnetism changes
Hydraulic control end to the actuator port of valve with described liquid flow control control valve is connected.
Preferably, described first working oil path is parallel with check valve, and the oil-in of described check valve is with described reversal valve even
Connecing, oil-out is connected with the rod chamber of described bucket hydraulic cylinder.
Preferably, the oil return opening of described solenoid directional control valve is connected with fuel tank, and oil-in is connected with pioneer pump, and described electromagnetism changes
Allow hand over to making described actuator port turn on described oil-in or turn on described oil return opening to valve.
Preferably, described main oil-feed oil circuit is provided with variable pump and is connected with overflow oil circuit, described overflow oil circuit sets
It is equipped with overflow valve.
Preferably, described reversal valve includes first guide's hydraulic control end and second guide's hydraulic control end, when hydraulic oil acts on institute
When stating first guide's hydraulic control end, described reversal valve switches to make the rod chamber oil-feed of described bucket hydraulic cylinder, rodless cavity oil return, when
When hydraulic oil acts on described second guide's hydraulic control end, described reversal valve switches to make the rodless cavity of described bucket hydraulic cylinder enter
Oil, rod chamber oil return, described first guide's hydraulic control end and second guide's hydraulic control end are respectively by first guide's oil circuit and second first
Oil Guide road is connected to guide's hydraulic control handle.
Additionally, the present invention also provides for a kind of excavator, wherein, this excavator includes according to described in technique scheme
Power shovel hydraulic system, with can stretching out so that described power shovel enters by the piston rod of described bucket hydraulic cylinder
Row excavates, and by the retraction of the piston rod of described bucket hydraulic cylinder, described power shovel is unloaded.
Additionally, the present invention also provides for a kind of method controlling power shovel excavation speed, wherein, the method includes following
Step: a, detection power shovel hydraulic cylinder rodless cavity in pressure；B, at the rodless cavity of described power shovel hydraulic cylinder
When oil-feed and rod chamber oil return, control described excavator according to the detected value of the pressure in the rodless cavity of power shovel hydraulic cylinder
The oil return flow velocity of the rod chamber of bucket hydraulic cylinder, to control the excavation speed of described power shovel.
Preferably, in described step b, compare with preset value including by described detected value, when described detected value is big
When described preset value, control the rod chamber of described power shovel hydraulic cylinder from un-throttled oil circuit oil return, when described detected value
During less than or equal to described preset value, control the rod chamber of described power shovel hydraulic cylinder from throttling oil circuit oil return.
By technique scheme, owing to described control device controls described shovel according to the detected value of described pressure transducer
The oil return flow velocity of the rod chamber of bucket hydraulic cylinder, to control the excavation speed of described power shovel such that it is able at bucket load
Less or under Gravitative Loads excavate when (now the rodless cavity pressure of bucket hydraulic cylinder diminishes) control described scraper bowl
The rod chamber of hydraulic cylinder with less flow velocity oil return, make scraper bowl steadily excavate to guarantee rodless cavity not to be emptied, and can
Carry out (now the rodless cavity pressure of bucket hydraulic cylinder becomes big) when heavy duty is excavated at scraper bowl and control described bucket hydraulic cylinder
Rod chamber with bigger flow velocity oil return, thus reduce excavation back pressure, improve digging efficiency and save the energy.
Other features and advantages of the present invention will be described in detail in detailed description of the invention part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and constitutes the part of description, with following tool
Body embodiment is used for explaining the present invention together, but is not intended that limitation of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram of a kind of power shovel hydraulic system of the prior art.
Fig. 2 is the schematic diagram of the power shovel hydraulic system of the first embodiment according to the present invention, wherein commutates
Valve is in cut-off state.
Fig. 3 is the schematic diagram of the power shovel hydraulic system of the first embodiment according to the present invention, wherein commutates
Valve is in right position, and electromagnetic flow control valve is in throttle.
Fig. 4 is the schematic diagram of the power shovel hydraulic system of the first embodiment according to the present invention, wherein commutates
Valve is in right position, and electromagnetic flow control valve is in un-throttled state.
Fig. 5 is the schematic diagram of the power shovel hydraulic system of the second embodiment according to the present invention, wherein commutates
Valve is in cut-off state.
Description of reference numerals
1 ' bucket cylinder 2 ' scraper bowl banked direction control valves
3 ' meter out hole 1 bucket hydraulic cylinder
2 reversal valve 2a the first guide hydraulic control ends
The main oil-feed oil circuit of 2b the second guide hydraulic control end 3
4 main oil return circuit 5 pressure transducers
6 controller 7 electromagnetic flow control valves
8 first working oil path 9 second working oil path
10 check valve 11 solenoid directional control valves
11A actuator port 11P oil-in
11T oil return opening 12 liquid flow control control valve
13 fuel tank 14 pioneer pumps
15 variable pump 16 guide's hydraulic control handles
Detailed description of the invention
Below in conjunction with accompanying drawing, the detailed description of the invention of the present invention is described in detail.It should be appreciated that this place is retouched
The detailed description of the invention stated is merely to illustrate and explains the present invention, is not limited to the present invention.
In invention, in the case of illustrating on the contrary, the noun of locality of use such as " left and right " typically refers to reference to accompanying drawing
Shown is left and right.
See Fig. 2 to Fig. 5, according to an aspect of the present invention, it is provided that a kind of power shovel hydraulic system, including scraper bowl
Hydraulic cylinder 1 and reversal valve 2, the rod chamber of this bucket hydraulic cylinder 1 and rodless cavity are by reversal valve 2 and main oil-feed oil circuit 3 and lead back
Oil oil circuit 4 connects, and wherein, power shovel hydraulic system also includes control system, and control system includes controlling device and pressure
Sensor 5, pressure transducer 5 is connected with the rodless cavity of bucket hydraulic cylinder 1, to detect this rodless cavity when described rodless cavity oil-feed
In pressure, control device be connected with pressure transducer 5, when rodless cavity oil-feed and the rod chamber oil return of bucket hydraulic cylinder 1, control
Device processed controls the oil return flow velocity of the rod chamber of bucket hydraulic cylinder 1 according to the detected value of pressure transducer 5, to control digger shovel
The excavation speed of bucket.
It is as noted previously, as and controls device and control the rod chamber of bucket hydraulic cylinder 1 according to the detected value of pressure transducer 5
Oil return flow velocity, to control the excavation speed of power shovel such that it is able to less at bucket load or dig under Gravitative Loads
When pick (now the rodless cavity pressure of bucket hydraulic cylinder 1 diminishes) control the rod chamber of described bucket hydraulic cylinder 1 with relatively
Little flow velocity oil return, makes scraper bowl steadily excavate to guarantee the rodless cavity of bucket hydraulic cylinder 1 not to be emptied, and can enter at scraper bowl
What when row heavy duty is excavated, (now the rodless cavity pressure of bucket hydraulic cylinder 1 becomes big) controlled described bucket hydraulic cylinder 1 has bar
Chamber with bigger flow velocity oil return, thus improve digging efficiency and save the energy.
It is understood that the core technology design of the present invention is the rodless cavity pressure by detecting bucket hydraulic cylinder 1
Control the oil return flow velocity of the rod chamber of bucket hydraulic cylinder 1 in real time, and do not lie in the concrete of the oil return flow velocity of control rod chamber
Technological means, say, that as long as any technical scheme that make use of the core technology of the present invention to conceive, fall within the present invention
Protection domain in.
Additionally, control device can include controller 6 and flow controlling unit, flow controlling unit can be at throttling oil circuit
Switching between position and un-throttled oil circuit position, pressure transducer 5 and flow controlling unit are connected with controller 6 respectively, when pressure passes
When the detected value of sensor 5 is less than the value preset, controller 6 makes flow controlling unit be in throttling oil circuit position, works as pressure sensing
When the detected value of device 5 is more than the value preset, controller 6 makes flow controlling unit be in un-throttled oil circuit position.
Specifically, see Fig. 2 to Fig. 4, according to the first embodiment of the present invention, control device and can include controller
6 and electromagnetic flow control valve 7, electromagnetic flow control valve 7 can switch between throttling oil circuit position and un-throttled oil circuit position, scraper bowl
The rod chamber of hydraulic cylinder 1 is connected with reversal valve 2 by the first working oil path 8, and electromagnetic flow control valve 7 is arranged on the first working oil
On road 8, pressure transducer 5 and electromagnetic flow control valve 7 are connected with controller 6 respectively, when the detected value of pressure transducer 5 is less than
During the value preset, controller 6 makes electromagnetic flow control valve 7 be in throttling oil circuit position, when the detected value of pressure transducer 5 is more than
During the value preset, controller 6 makes electromagnetic flow control valve 7 be in un-throttled oil circuit position.Wherein, described default force value is used
It is in throttling oil circuit position or un-throttled oil circuit position, to control the rod chamber of bucket hydraulic cylinder 1 in instruction electromagnetic flow control valve 7
Oil return flow velocity, it is to be understood that this preset force value be the specific works situation according to power shovel depending on, right
For those skilled in the art, can easily set this according to the practical working situation of power shovel and needs and preset
Force value (such as determining this force value preset by normal experiment), therefore repeat no more here.In the above-described embodiment,
The present invention realizes the control of the oil return flow velocity of rod chamber to bucket hydraulic cylinder 1 by electromagnetic flow control valve 7, but, just
As previously mentioned, the present invention is expressly not limited to this embodiment.
Additionally, the first working oil path 8 can be parallel with check valve 10, the oil-in of check valve 10 is connected with reversal valve 2, goes out
Hydraulic fluid port is connected with the rod chamber of bucket hydraulic cylinder 1, owing to the rod chamber of bucket hydraulic cylinder 1 is by check valve 10 oil-feed, thus can
To ensure the normal unloading of scraper bowl.
Explain the power shovel hydraulic system of the first embodiment according to the present invention below in conjunction with the accompanying drawings
How to work:
From figure 2 it can be seen that reversal valve 2 is in middle position cut-off state, now power shovel does not works.
From figure 3, it can be seen that reversal valve 2 switches to illustrate right position so that the rodless cavity oil-feed of bucket hydraulic cylinder 1, have
The oil return of bar chamber, the force value during now pressure transducer 5 detects the rodless cavity of bucket hydraulic cylinder 1 is less than the value preset, thus
The signal detected passes to controller 6, and controller 6 makes electromagnetic flow control valve 7 be in (the diagram right side, throttling oil circuit position
Position), so it is able to ensure that the rodless cavity of bucket hydraulic cylinder 1 is not emptied, so that scraper bowl steadily excavates.
Figure 4, it is seen that reversal valve 2 is still in illustrating right position so that the rodless cavity oil-feed of bucket hydraulic cylinder 1, have
The oil return of bar chamber, the force value during now pressure transducer 5 detects the rodless cavity of bucket hydraulic cylinder 1 is more than the value preset, thus
The signal detected passes to controller 6, and controller 6 makes electromagnetic flow control valve 7 be in (diagram a left side, un-throttled oil circuit position
Position), so can make rod chamber oil return when without throttling of bucket hydraulic cylinder 1, excavate back pressure such that it is able to reduce, carry
High digging efficiency, saves the energy.
Although it is not shown, but be well understood that, when reversal valve 2 switches to enter so that the rod chamber of bucket hydraulic cylinder 1
Oil, during rodless cavity oil return, no matter electromagnetic flow control valve 7 is in throttling oil circuit position or un-throttled oil circuit position (due to check valve
The existence of 10), the normal unloading of scraper bowl can be ensured.
See Fig. 5, according to the second embodiment of the present invention, control device and can include controller 6, solenoid directional control valve
11 and liquid flow control control valve 12, liquid flow control control valve 12 can switch between throttling oil circuit position and un-throttled oil circuit position,
The rod chamber of bucket hydraulic cylinder 1 is connected with reversal valve 2 by the first working oil path 8, and liquid flow control control valve 12 is arranged on first
In working oil path 8, the automatically controlled end of pressure transducer 5 and solenoid directional control valve 11 is connected with controller 6 respectively, solenoid directional control valve 11
Actuator port 11A is connected with the hydraulic control end of liquid flow control control valve 12, when the detected value of pressure transducer 5 is less than the value preset
Time, controller 6 makes solenoid directional control valve 11 make electromagnetic flow control valve 7 be in throttling oil circuit position, when the detection of pressure transducer 5
When value is more than the value preset, controller 6 makes solenoid directional control valve 11 make electromagnetic flow control valve 7 be in un-throttled oil circuit position.
Wherein, the first working oil path 8 can also be parallel with check valve 10, and the oil-in of check valve 10 is connected with reversal valve 2,
Oil-out is connected with the rod chamber of bucket hydraulic cylinder 1.Owing to the rod chamber of bucket hydraulic cylinder 1 is by check valve 10 oil-feed, thus
Can ensure that the normal unloading of scraper bowl.
Wherein, the oil return opening 11T of solenoid directional control valve 11 can be connected with fuel tank 13, and oil-in 11P is connected with pioneer pump 14,
Solenoid directional control valve 11 allows hand over to making actuator port 11A and oil-in 11P conducting or turning on oil return opening 11T.But the present invention
It is not limited to this.
The operation principle of the power shovel hydraulic system of the second embodiment according to the present invention is excavated with the first
The operation principle of mechanical shovel bucket hydraulic system is similar to, and differs primarily in that employing electromagnetic flow control valve 7 in the first embodiment
Control the oil return flow velocity of the rod chamber of bucket hydraulic cylinder 1, and the second embodiment uses solenoid directional control valve 11 and liquid flow control
Control valve 12 controls the oil return flow velocity of the rod chamber of bucket hydraulic cylinder 1, and this change is to those skilled in the art
It is well understood by, therefore repeats no more here, additionally, other various suitable changes (including the change etc. of Hydraulic Elements) are also
Permissible, as long as being capable of the control of the oil return flow velocity of the rod chamber to bucket hydraulic cylinder 1, these technical schemes are all incited somebody to action
Fall in protection scope of the present invention.
In both the above embodiment, main oil-feed oil circuit 3 can be provided with variable pump 15 and main oil-feed oil circuit 3 is permissible
It is connected with overflow oil circuit, this overflow oil circuit is provided with overflow valve.Certainly, in the case of suitably, variable pump 15 is replaced to
Dosing pump is also possible, and these schemes all ought to be protected by the present invention.
In both the above embodiment, reversal valve 2 can include the first guide hydraulic control end 2a and second guide's hydraulic control end
2b, when hydraulic oil acts on the first guide hydraulic control end 2a, reversal valve 2 switches to make the rod chamber oil-feed of bucket hydraulic cylinder 1, nothing
The oil return of bar chamber, when hydraulic oil acts on the second guide hydraulic control end 2b, reversal valve 2 switches to make the rodless cavity of bucket hydraulic cylinder 1
Oil-feed, rod chamber oil return.Additionally, the first guide hydraulic control end 2a and the second guide hydraulic control end 2b can also pass through the first guide respectively
Oil circuit and second guide's oil circuit are connected to guide's hydraulic control handle 16.But the invention is not restricted to this.
According to another aspect of the present invention, it is provided that a kind of excavator, wherein, this excavator includes according to above-mentioned technical side
Power shovel hydraulic system described in case, with can stretching out so that digger shovel by the piston rod of bucket hydraulic cylinder 1
Bucket excavates, and by the retraction of the piston rod of bucket hydraulic cylinder 1, power shovel is unloaded.
According to a further aspect of the invention, it is provided that a kind of method of excavation speed controlling power shovel, wherein, should
Method comprises the following steps: a, detection power shovel hydraulic cylinder rodless cavity in pressure；B, at power shovel hydraulic cylinder
Rodless cavity oil-feed and during rod chamber oil return, control to dig according to the detected value of the pressure in the rodless cavity of power shovel hydraulic cylinder
The oil return flow velocity of the rod chamber of pick machine bucket hydraulic cylinder, to control the excavation speed of power shovel.As noted, originally
The core technology design of invention is to control bucket hydraulic cylinder in real time by the rodless cavity pressure of detection bucket hydraulic cylinder
The oil return flow velocity of rod chamber, this has obtained good embodiment in the above-mentioned methods.Specifically, in stepb, including detecting
Value compares with preset value, when detected value is more than described preset value, controls the rod chamber of described power shovel hydraulic cylinder
From un-throttled oil circuit oil return, when detected value is less than or equal to preset value, control the rod chamber of power shovel hydraulic cylinder from joint
Stream oil circuit oil return.As noted, to those skilled in the art, can be according to the real work of power shovel
Situation and needs and easily set this force value preset (such as determining this default force value by normal experiment), therefore this
In repeat no more.
The preferred embodiment of the present invention is described in detail above in association with accompanying drawing, but, the present invention is not limited to above-mentioned reality
Execute the detail in mode, in the technology concept of the present invention, technical scheme can be carried out multiple letter
Monotropic type, these simple variant belong to protection scope of the present invention.
It is further to note that each the concrete technical characteristic described in above-mentioned detailed description of the invention, at not lance
In the case of shield, can be combined by any suitable means.In order to avoid unnecessary repetition, the present invention to various can
The compound mode of energy illustrates the most separately.
Additionally, combination in any can also be carried out between the various different embodiment of the present invention, as long as it is without prejudice to this
The thought of invention, it should be considered as content disclosed in this invention equally.
Claims (10)
1. a power shovel hydraulic system, including bucket hydraulic cylinder (1) and reversal valve (2), the nothing of this bucket hydraulic cylinder (1)
Bar chamber and rod chamber are connected with main oil-feed oil circuit (3) and main oil return circuit (4) by described reversal valve (2) respectively, and its feature exists
In, described power shovel hydraulic system also includes that control system, described control system include controlling device and pressure transducer
(5), described pressure transducer (5) is connected with the rodless cavity of described bucket hydraulic cylinder (1), to detect when described rodless cavity oil-feed
Pressure in this rodless cavity, described control device is connected with described pressure transducer (5), in the nothing of described bucket hydraulic cylinder (1)
When the oil-feed of bar chamber and rod chamber oil return, described control device controls described scraper bowl according to the detected value of described pressure transducer (5)
The oil return flow velocity of the rod chamber of hydraulic cylinder (1), to control the excavation speed of described power shovel, described control device includes control
Device processed (6) and flow controlling unit, described flow controlling unit can switch between throttling oil circuit position and un-throttled oil circuit position,
Described pressure transducer (5) and described flow controlling unit are connected with described controller (6) respectively, when described pressure transducer
(5), when detected value is less than the value preset, described controller (6) makes described flow controlling unit be in throttling oil circuit position, when
When the detected value of described pressure transducer (5) is more than described default value, described controller (6) makes described flow controlling unit
It is in un-throttled oil circuit position.
Power shovel hydraulic system the most according to claim 1, it is characterised in that described flow controlling unit is electromagnetism
Flow control valve (7), the rod chamber of described bucket hydraulic cylinder (1) is by the first working oil path (8) with described reversal valve (2) even
Connecing, described electromagnetic flow control valve (7) is arranged on described first working oil path (8).
Power shovel hydraulic system the most according to claim 2, it is characterised in that described first working oil path (8) and
Being associated with check valve (10), the oil-in of described check valve (10) is connected with described reversal valve (2), oil-out and described bucket hydraulic
The rod chamber of cylinder (1) connects.
Power shovel hydraulic system the most according to claim 1, it is characterised in that described flow controlling unit includes electricity
Magnetic reversal valve (11) and liquid flow control control valve (12), the rod chamber of described bucket hydraulic cylinder (1) passes through the first working oil path (8)
Being connected with described reversal valve (2), described liquid flow control control valve (12) is arranged on described first working oil path (8), described pressure
The automatically controlled end of force transducer (5) and described solenoid directional control valve (11) is connected with described controller (6) respectively, described solenoid directional control valve
(11) actuator port (11A) is connected with the hydraulic control end of described liquid flow control control valve (12).
Power shovel hydraulic system the most according to claim 4, it is characterised in that described first working oil path (8) and
Being associated with check valve (10), the oil-in of described check valve (10) is connected with described reversal valve (2), oil-out and described bucket hydraulic
The rod chamber of cylinder (1) connects.
Power shovel hydraulic system the most according to claim 4, it is characterised in that returning of described solenoid directional control valve (11)
Hydraulic fluid port (11T) is connected with fuel tank (13), and oil-in (11P) is connected with pioneer pump (14), and described solenoid directional control valve (11) can be cut
Shift to make described actuator port (11A) turn on described oil-in (11P) or turn on described oil return opening (11T).
Power shovel hydraulic system the most as claimed in any of claims 1 to 6, it is characterised in that described master enters
It is provided with variable pump (15) on oil oil circuit (3), and described main oil-feed oil circuit (3) is connected with overflow oil circuit, on described overflow oil circuit
It is provided with overflow valve.
Power shovel hydraulic system the most as claimed in any of claims 1 to 6, it is characterised in that described commutation
Valve (2) includes first guide's hydraulic control end (2a) and second guide's hydraulic control end (2b), when hydraulic oil acts on the described first first drain
During control end (2a), described reversal valve (2) switches to make the rod chamber oil-feed of described bucket hydraulic cylinder (1), rodless cavity oil return, works as liquid
When force feed acts on described second guide hydraulic control end (2b), described reversal valve (2) switches to make the nothing of described bucket hydraulic cylinder (1)
The oil-feed of bar chamber, rod chamber oil return, described first guide's hydraulic control end (2a) and second guide's hydraulic control end (2b) are respectively by first first
Oil Guide road and second guide's oil circuit are connected to guide's hydraulic control handle (16).
9. an excavator, it is characterised in that this excavator includes excavation as claimed in any of claims 1 to 8
Mechanical shovel bucket hydraulic system, with can stretching out so that described power shovel enters by the piston rod of described bucket hydraulic cylinder (1)
Row excavates, and by the retraction of the piston rod of described bucket hydraulic cylinder (1), described power shovel is unloaded.
10. the method controlling power shovel excavation speed, it is characterised in that the method comprises the following steps:
A, detection power shovel hydraulic cylinder rodless cavity in pressure；
B, when the rodless cavity oil-feed of described power shovel hydraulic cylinder and rod chamber oil return, according to power shovel hydraulic cylinder
The detected value of the pressure in rodless cavity controls the oil return flow velocity of the rod chamber of described power shovel hydraulic cylinder, digs described in controlling
The excavation speed of pick mechanical shovel bucket,
In described step b, compare with preset value including by described detected value, when described detected value is more than described preset value
Time, control the rod chamber of described power shovel hydraulic cylinder from un-throttled oil circuit oil return, when described detected value is less than or equal to institute
When stating preset value, control the rod chamber of described power shovel hydraulic cylinder from throttling oil circuit oil return.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410227924.5A CN103993623B (en) | 2014-05-27 | 2014-05-27 | Excavator, bucket hydraulic system thereof and method for controlling bucket excavating speed of excavator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410227924.5A CN103993623B (en) | 2014-05-27 | 2014-05-27 | Excavator, bucket hydraulic system thereof and method for controlling bucket excavating speed of excavator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103993623A CN103993623A (en) | 2014-08-20 |
| CN103993623B true CN103993623B (en) | 2016-12-07 |
Family
ID=51307938
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410227924.5A Active CN103993623B (en) | 2014-05-27 | 2014-05-27 | Excavator, bucket hydraulic system thereof and method for controlling bucket excavating speed of excavator |
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| CN106089826A (en) * | 2016-08-10 | 2016-11-09 | 龙工(上海)机械制造有限公司 | A kind of four in one bucket hydraulic system for wheel loader |
| CN108488121B (en) * | 2018-02-12 | 2020-11-10 | 宝鸡石油机械有限责任公司 | Hydraulic self-walking control method and control system for moving device |
| CN108729479A (en) * | 2018-05-28 | 2018-11-02 | 柳州柳工挖掘机有限公司 | Bucket rod cylinder of excavator hydraulic control system and control method |
| CN109484784A (en) * | 2018-12-29 | 2019-03-19 | 福建龙马环卫装备股份有限公司 | A kind of Lifting tail gate decrease speed control system |
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| CN110332163B (en) * | 2019-07-25 | 2024-04-19 | 中国铁建重工集团股份有限公司 | Hydraulic control system and scraper |
| CN110616770A (en) * | 2019-09-23 | 2019-12-27 | 三一重机有限公司 | Anti-suction control system and control method for bucket rod oil cylinder, bucket rod oil cylinder and excavator |
| CN111395425B (en) * | 2020-04-02 | 2022-09-02 | 上海三一重机股份有限公司 | Bucket rod oil cylinder control system and method and excavator |
| CN111519677B (en) * | 2020-04-28 | 2022-03-01 | 三一重机有限公司 | Floating hydraulic system and engineering machinery |
| CN111535393A (en) * | 2020-05-25 | 2020-08-14 | 上海三一重机股份有限公司 | Excavator bucket control system and method and excavator |
| CN115045354A (en) * | 2022-06-30 | 2022-09-13 | 徐州徐工矿业机械有限公司 | Hydraulic energy-saving system, excavator and control method of excavator in bucket and arm combined action |
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| JP2011106513A (en) * | 2009-11-13 | 2011-06-02 | Toyota Industries Corp | Hydraulic control device for cargo handling |
| JP5831233B2 (en) * | 2012-01-04 | 2015-12-09 | 株式会社豊田自動織機 | lift device |
| CN102588359B (en) * | 2012-02-28 | 2014-10-22 | 上海中联重科桩工机械有限公司 | Hydraulic system, excavator and control method of hydraulic system |
| CN202732515U (en) * | 2012-07-13 | 2013-02-13 | 三一重工股份有限公司 | Flow control hydraulic system and engineering machine |
| CN203063751U (en) * | 2012-11-07 | 2013-07-17 | 秦皇岛天业通联重工股份有限公司 | Mining dump truck and hydraulic pressure lifting controlling system of mining dump truck |
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Effective date of registration: 20211203 Address after: Room 4015, office building, 677 Lugu Avenue, Changsha hi tech Development Zone, Hunan 410000 Patentee after: Zoomlion earth moving machinery Co.,Ltd. Address before: 714000 west section of Chaoyang Street, high tech Zone, Weinan City, Shaanxi Province Patentee before: ZOOMLION HEAVY INDUSTRY SCIENCE&TECHNOLOGY Co.,Ltd. |