CN103993623A - 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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- CN103993623A CN103993623A CN201410227924.5A CN201410227924A CN103993623A CN 103993623 A CN103993623 A CN 103993623A CN 201410227924 A CN201410227924 A CN 201410227924A CN 103993623 A CN103993623 A CN 103993623A
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000001514 detection method Methods 0.000 claims abstract description 6
- 239000003921 oil Substances 0.000 claims description 126
- 238000009412 basement excavation Methods 0.000 claims description 21
- 239000007788 liquid Substances 0.000 claims description 12
- 239000010720 hydraulic oil Substances 0.000 claims description 6
- 239000002828 fuel tank Substances 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 6
- 238000005065 mining Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000004134 energy conservation Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000002689 soil 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, particularly, relate to a kind of method of power shovel hydraulic system, excavator and control power shovel excavation speed.
Background technology
Hydraulic crawler excavator is a kind of restoration in earth-rock construction machinery of discontinuous running, and its course of work is: with the cutting edge cutting soil of scraper bowl, scraper bowl is filled rear lifting, returned back to and unload native position, and the scraper bowl after unstowing returns and excavates position and start operation next time.It is widely used in fields such as building, communications and transportation, minings, to extensive use.
In the working cycles of excavator, mining process load is large, and power consumption is many, and mining ability and the digging efficiency of scraper bowl are most important.Fig. 1 has shown a kind of power shovel hydraulic system of the prior art, comprise the scraper bowl banked direction control valves 2 ' of bucket cylinder 1 ' and this bucket cylinder 1 ' stretching motion of control, wherein, in the time that 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 unloads action.In mining process, scraper bowl may accelerate to glide under Action of Gravity Field, gliding speed will cause while exceeding the delivery rate of rodless cavity of bucket cylinder 1 ' that rodless cavity inhales empty, thereby cause 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 meter out hole 3 ' or regeneration one way valve, thereby regenerate to realize the steady excavation of scraper bowl by throttle grverning or throttling, but can limit like this rod chamber oil return flow velocity of scraper bowl bucket cylinder 1 ' in mining process, thereby excavation speed is declined; In addition, due to throttling action, the pressure of bucket cylinder 1 ' rod chamber and excavation back pressure can increase, and cause digging force reduction and power dissipation serious.
Given this, be necessary to provide a kind of novel power shovel hydraulic system, to overcome or to alleviate above-mentioned defect.
Summary of the invention
An object of the present invention is to provide a kind of power shovel hydraulic system, this power shovel hydraulic system can be controlled the excavation speed of described power shovel.
Another object of the present invention is to provide a kind of excavator, and this excavator uses power shovel hydraulic system provided by the invention.
A further object of the present invention is to provide a kind of method of controlling power shovel excavation speed, and the method can be controlled the excavation speed of described power shovel effectively.
To achieve these goals, the invention provides a kind of power shovel hydraulic system, comprise scraper bowl hydraulic cylinder and reversal valve, the rodless cavity of this scraper bowl hydraulic cylinder is connected with main oil-feed oil circuit and main oil return circuit by described reversal valve respectively with rod chamber, wherein, described power shovel hydraulic system also comprises control system, described control system comprises control device and pressure sensor, described pressure sensor is connected with the rodless cavity of described scraper bowl hydraulic cylinder, to detect the pressure in this rodless cavity when the described rodless cavity oil-feed, described control device is connected with described pressure sensor, in the time of the rodless cavity oil-feed of described scraper bowl hydraulic cylinder and rod chamber oil return, described control device is according to the oil return flow velocity of the rod chamber of scraper bowl hydraulic cylinder described in the detected value control of described pressure sensor, to control the excavation speed of described power shovel.
Preferably, described control device comprises controller and flow controlling unit, described flow controlling unit can switch between throttling oil circuit position and non-throttling oil circuit position, described pressure sensor is connected with described controller respectively with described flow controlling unit, in the time that the detected value of described pressure sensor is less than default value, described controller makes described flow controlling unit in throttling oil circuit position, in the time that the detected value of described pressure sensor is greater than described default value, described controller makes described flow controlling unit in non-throttling oil circuit position.
Preferably, described flow controlling unit is electromagnetic flow control valve, and the rod chamber of described scraper bowl hydraulic cylinder is connected with described reversal valve by the first working oil path, and described electromagnetic flow control valve is arranged in described the first working oil path.
Preferably, described throttling oil circuit is parallel with one way valve, and the oil-in of described one way valve is connected with described reversal valve, and oil-out is connected with the rod chamber of described scraper bowl hydraulic cylinder.
Preferably, described flow controlling unit comprises solenoid operated directional valve and liquid flow control control valve, the rod chamber of described scraper bowl hydraulic cylinder is connected with described reversal valve by the first working oil path, described liquid flow control control valve is arranged in described the first working oil path, the automatically controlled end of described pressure sensor and described solenoid operated directional valve is connected with described controller respectively, and the actuator port of described solenoid operated directional valve is connected with the hydraulic control end of described liquid flow control control valve.
Preferably, described throttling oil circuit is parallel with one way valve, and the oil-in of described one way valve is connected with described reversal valve, and oil-out is connected with the rod chamber of described scraper bowl hydraulic cylinder.
Preferably, the oil return opening of described solenoid operated directional valve is connected with fuel tank, and oil-in is connected with pioneer pump, described solenoid operated directional valve can switch to make described actuator port and described oil-in conducting or with described oil return opening conducting.
Preferably, on described main oil-feed oil circuit, be provided with variable pump and be connected with overflow oil circuit, on described overflow oil circuit, being provided with overflow valve.
Preferably, described reversal valve comprises first guide's hydraulic control end and second guide's hydraulic control end, in the time that hydraulic oil acts on described first guide's hydraulic control end, described reversal valve switches to the rod chamber oil-feed that makes described scraper bowl hydraulic cylinder, rodless cavity oil return, in the time that hydraulic oil acts on described second guide's hydraulic control end, described reversal valve switches to the rodless cavity oil-feed that makes described scraper bowl hydraulic cylinder, rod chamber oil return, described first guide's hydraulic control end and second guide's hydraulic control end are connected to guide's hydraulic control handle by first guide's oil circuit and second guide's oil circuit respectively.
In addition, the present invention also provides a kind of excavator, wherein, this excavator comprises according to the power shovel hydraulic system described in technique scheme, can described power shovel being excavated by stretching out of the piston rod of described scraper bowl hydraulic cylinder, and the retraction of piston rod by described scraper bowl hydraulic cylinder unloads described power shovel.
In addition, the present invention also provides a kind of method of controlling power shovel excavation speed, and wherein, the method comprises the following steps: the pressure in the rodless cavity of a, detection power shovel hydraulic cylinder; B, in the time of the rodless cavity oil-feed of described power shovel hydraulic cylinder and rod chamber oil return, according to the oil return flow velocity of the rod chamber of power shovel hydraulic cylinder described in the detected value control of the pressure in the rodless cavity of power shovel hydraulic cylinder, to control the excavation speed of described power shovel.
Preferably, in described step b, comprise described detected value and preset value are compared, in the time that described detected value is greater than described preset value, control the rod chamber of described power shovel hydraulic cylinder from the oil return of non-throttling oil circuit, in the time that described detected value is less than or equal to described preset value, control the rod chamber of described power shovel hydraulic cylinder from the oil return of throttling oil circuit.
Pass through technique scheme, because described control device is according to the oil return flow velocity of the rod chamber of scraper bowl hydraulic cylinder described in the detected value control of described pressure sensor, to control the excavation speed of described power shovel, thereby can be in scraper bowl load less or under Gravitative Loads, excavate etc. (now the rodless cavity pressure of scraper bowl hydraulic cylinder diminishes) in situation control described scraper bowl hydraulic cylinder rod chamber with less flow velocity oil return, to guarantee rodless cavity not inhale sky, scraper bowl is steadily excavated, and can scraper bowl carry out (now the rodless cavity pressure of scraper bowl hydraulic cylinder becomes greatly) in situation such as heavy duty excavations etc. control described scraper bowl hydraulic cylinder rod chamber with larger flow velocity oil return, thereby reduce to excavate back pressure, improve digging efficiency and energy conservation.
Other features and advantages of the present invention are described in detail the detailed description of the invention part subsequently.
Brief description of the drawings
Accompanying drawing is to be used to provide a further understanding of the present invention, and forms a part for manual, is used from explanation the present invention, but is not construed as limiting the invention with detailed description of the invention one below.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 that wherein reversal valve is in cut-off state according to the schematic diagram of the power shovel hydraulic system of the first embodiment of the present invention.
Fig. 3 is according to the schematic diagram of the power shovel hydraulic system of the first embodiment of the present invention, and wherein reversal valve is in right position, and electromagnetic flow control valve is in throttle.
Fig. 4 is according to the schematic diagram of the power shovel hydraulic system of the first embodiment of the present invention, and wherein reversal valve is in right position, and electromagnetic flow control valve is in non-throttle.
Fig. 5 is that wherein reversal valve is in cut-off state according to the schematic diagram of the power shovel hydraulic system of the second embodiment of the present invention.
Description of reference numerals
1 ' bucket cylinder 2 ' scraper bowl banked direction control valves
3 ' meter out hole 1 scraper bowl hydraulic cylinder
2 reversal valve 2a first guide's hydraulic control ends
The main oil-feed oil circuit of 2b second guide's hydraulic control end 3
4 main oil return circuit 5 pressure sensors
6 controller 7 electromagnetic flow control valves
8 first working oil path 9 second working oil path
10 one way valve 11 solenoid operated directional valves
11A actuator port 11P oil-in
11T oil return opening 12 liquid flow control control valves
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 specific embodiment of the present invention is elaborated.Should be understood that, detailed description of the invention described herein only, for description and interpretation the present invention, is not limited to the present invention.
In invention, in the situation that not doing contrary explanation, the noun of locality of use typically refers to reference to shown in the drawings left and right as " left and right ".
Referring to Fig. 2 to Fig. 5, according to an aspect of the present invention, a kind of power shovel hydraulic system is provided, comprise scraper bowl hydraulic cylinder 1 and reversal valve 2, the rod chamber of this scraper bowl hydraulic cylinder 1 is connected with main oil-feed oil circuit 3 and main oil return circuit 4 by reversal valve 2 with rodless cavity, wherein, power shovel hydraulic system also comprises control system, control system comprises control device and pressure sensor 5, pressure sensor 5 is connected with the rodless cavity of scraper bowl hydraulic cylinder 1, to detect the pressure in this rodless cavity when the described rodless cavity oil-feed, control device is connected with pressure sensor 5, in the time of the rodless cavity oil-feed of scraper bowl hydraulic cylinder 1 and rod chamber oil return, control device is according to the oil return flow velocity of the rod chamber of the detected value control scraper bowl hydraulic cylinder 1 of pressure sensor 5, to control the excavation speed of power shovel.
As mentioned above, because control device is according to the oil return flow velocity of the rod chamber of the detected value control scraper bowl hydraulic cylinder 1 of pressure sensor 5, to control the excavation speed of power shovel, thereby can be in scraper bowl load less or under Gravitative Loads, excavate etc. (now the rodless cavity pressure of scraper bowl hydraulic cylinder 1 diminishes) in situation control described scraper bowl hydraulic cylinder 1 rod chamber with less flow velocity oil return, do not inhale sky and scraper bowl is steadily excavated to guarantee the rodless cavity of scraper bowl hydraulic cylinder 1, and can scraper bowl carry out (now the rodless cavity pressure of scraper bowl hydraulic cylinder 1 becomes greatly) in situation such as heavy duty excavations etc. control described scraper bowl hydraulic cylinder 1 rod chamber with larger flow velocity oil return, thereby improve digging efficiency and energy conservation.
Be understandable that; core technology design of the present invention is to control in real time by the rodless cavity pressure of detection scraper bowl hydraulic cylinder 1 the oil return flow velocity of the rod chamber of scraper bowl hydraulic cylinder 1; and do not lie in the concrete technological means of oil return flow velocity of controlling rod chamber; that is to say; as long as utilized any technical scheme of core technology design of the present invention, all will fall into protection scope of the present invention.
In addition, control device can comprise controller 6 and flow controlling unit, flow controlling unit can switch between throttling oil circuit position and non-throttling oil circuit position, pressure sensor 5 is connected with controller 6 respectively with flow controlling unit, in the time that the detected value of pressure sensor 5 is less than default value, controller 6 makes flow controlling unit in throttling oil circuit position, and in the time that the detected value of pressure sensor 5 is greater than default value, controller 6 makes flow controlling unit in non-throttling oil circuit position.
Particularly, referring to Fig. 2 to Fig. 4, according to the first embodiment of the present invention, control device can comprise controller 6 and electromagnetic flow control valve 7, electromagnetic flow control valve 7 can switch between throttling oil circuit position and non-throttling oil circuit position, the rod chamber of scraper bowl hydraulic cylinder 1 is connected with reversal valve 2 by the first working oil path 8, electromagnetic flow control valve 7 is arranged in the first working oil path 8, pressure sensor 5 is connected with controller 6 respectively with electromagnetic flow control valve 7, in the time that the detected value of pressure sensor 5 is less than default value, controller 6 makes electromagnetic flow control valve 7 in throttling oil circuit position, in the time that the detected value of pressure sensor 5 is greater than default value, controller 6 makes electromagnetic flow control valve 7 in non-throttling oil circuit position.Wherein, it is also non-throttling oil circuit position in throttling oil circuit position that described default force value is used to indicate electromagnetic flow control valve 7, to control the oil return flow velocity of rod chamber of scraper bowl hydraulic cylinder 1, be understandable that, this default force value is according to the specific works situation of power shovel and fixed, to those skilled in the art, can easily set this default force value (for example determining by normal experiment the force value that this is default) with needing according to the practical working situation of power shovel, therefore repeat no more here.In the above-described embodiment, the present invention realizes the control of the oil return flow velocity of the rod chamber to scraper bowl hydraulic cylinder 1 by electromagnetic flow control valve 7, but as above-mentioned, the present invention is obviously not limited to this embodiment.
In addition, throttling oil circuit can be parallel with one way valve 10, and the oil-in of one way valve 10 is connected with reversal valve 2, and oil-out is connected with the rod chamber of scraper bowl hydraulic cylinder 1, because the rod chamber of scraper bowl hydraulic cylinder 1 passes through one way valve 2 oil-feeds, thereby can ensure the normal unloading of scraper bowl.
Explain according to the power shovel hydraulic system of the first embodiment of the present invention and how to work below in conjunction with accompanying drawing:
As can be seen from Figure 2, reversal valve 2 is in meta cut-off state, and now power shovel is not worked.
As can be seen from Figure 3, reversal valve 2 switches to the right position of diagram, make the rodless cavity oil-feed of scraper bowl hydraulic cylinder 1, rod chamber oil return, now pressure sensor 5 detects that the force value in the rodless cavity of scraper bowl hydraulic cylinder 1 is less than default value, thereby the signal detecting is passed to controller 6, and controller 6 makes electromagnetic flow control valve 7 (illustrate right position) in throttling oil circuit position, can guarantee that like this rodless cavity of scraper bowl hydraulic cylinder 1 do not inhale sky, thereby scraper bowl is steadily excavated.
As can be seen from Figure 4, reversal valve 2 is still in illustrating right position, make the rodless cavity oil-feed of scraper bowl hydraulic cylinder 1, rod chamber oil return, now pressure sensor 5 detects that the force value in the rodless cavity of scraper bowl hydraulic cylinder 1 is greater than default value, thereby the signal detecting is passed to controller 6, controller 6 makes electromagnetic flow control valve 7 (illustrate left position) in non-throttling oil circuit position, can make like this rod chamber oil return under the state without throttling of scraper bowl hydraulic cylinder 1, thereby can reduce to excavate back pressure, improve digging efficiency, energy conservation.
Although not shown, but be well understood that, when reversal valve 2 switches to the rod chamber oil-feed that makes scraper bowl hydraulic cylinder 1, when rodless cavity oil return, no matter electromagnetic flow control valve 7 is also non-throttling oil circuit position (due to the existence of one way valve 10) in throttling oil circuit position, can both ensure the normal unloading of scraper bowl.
Referring to Fig. 5, according to the second embodiment of the present invention, control device can comprise controller 6, solenoid operated directional valve 11 and liquid flow control control valve 12, liquid flow control control valve 12 can switch between throttling oil circuit position and non-throttling oil circuit position, the rod chamber of scraper bowl hydraulic cylinder 1 is connected with reversal valve 2 by the first working oil path 8, liquid flow control control valve 12 is arranged in the first working oil path 8, the automatically controlled end of pressure sensor 5 and solenoid operated directional valve 11 is connected with controller 6 respectively, the actuator port 11A of solenoid operated directional valve 11 is connected with the hydraulic control end of liquid flow control control valve 12, in the time that the detected value of pressure sensor 5 is less than default value, controller 6 makes solenoid operated directional valve 11 make electromagnetic flow control valve 7 in throttling oil circuit position, in the time that the detected value of pressure sensor 5 is greater than default value, controller 6 makes solenoid operated directional valve 11 make electromagnetic flow control valve 7 in non-throttling oil circuit position.
Wherein, throttling oil circuit also can be parallel with one way valve 10, and the oil-in of one way valve 10 is connected with reversal valve 2, and oil-out is connected with the rod chamber of scraper bowl hydraulic cylinder 1.Because the rod chamber of scraper bowl hydraulic cylinder 1 passes through one way valve 2 oil-feeds, thereby can ensure the normal unloading of scraper bowl.
Wherein, the oil return opening 11T of solenoid operated directional valve 11 can be connected with fuel tank 13, and oil-in 11P is connected with pioneer pump 14, solenoid operated directional valve 11 can switch to make actuator port 11A and oil-in 11P conducting or with oil return opening 11T conducting.But the invention is not restricted to this.
Similar according to the operating principle of the operating principle of the power shovel hydraulic system of the second embodiment of the present invention and the first power shovel hydraulic system, the main distinction is to adopt electromagnetic flow control valve 7 to control the oil return flow velocity of the rod chamber of scraper bowl hydraulic cylinder 1 in the first embodiment, and in the second embodiment, adopt solenoid operated directional valve 11 and liquid flow control control valve 12 to control the oil return flow velocity of the rod chamber of scraper bowl hydraulic cylinder 1, this variation is fine understanding to those skilled in the art, therefore repeat no more here, in addition, other various suitable variations (comprising the variation of Hydraulic Elements etc.) are also fine, as long as can realize the control of the oil return flow velocity of the rod chamber to scraper bowl hydraulic cylinder 1, these technical schemes all will fall into protection scope of the present invention.
In above two kinds of embodiments, on main oil-feed oil circuit 3, can be provided with variable pump 15 and main oil-feed oil circuit 3 can be connected with overflow oil circuit, on this overflow oil circuit, be provided with overflow valve.Certainly, in situation suitably, variable pump 15 is replaced to constant displacement pump and be also fine, these schemes all ought to be subject to protection of the present invention.
In above two kinds of embodiments, reversal valve 2 can comprise first guide's hydraulic control end 2a and second guide's hydraulic control end 2b, in the time that hydraulic oil acts on first guide's hydraulic control end 2a, reversal valve 2 switches to the rod chamber oil-feed that makes scraper bowl hydraulic cylinder 1, rodless cavity oil return, in the time that hydraulic oil acts on second guide's hydraulic control end 2b, reversal valve 2 switches to the rodless cavity oil-feed that makes scraper bowl hydraulic cylinder 1, rod chamber oil return.In addition, first guide's hydraulic control end 2a and second guide's hydraulic control end 2b can also be connected to guide's hydraulic control handle 16 by first guide's oil circuit and second guide's oil circuit respectively.But the invention is not restricted to this.
According to another aspect of the present invention, a kind of excavator is provided, wherein, this excavator comprises according to the power shovel hydraulic system described in technique scheme, can power shovel being excavated by stretching out of the piston rod of scraper bowl hydraulic cylinder 1, and the retraction of piston rod by scraper bowl hydraulic cylinder 1 unloads power shovel.
According to a further aspect of the invention, provide a kind of method of the excavation speed of controlling power shovel, wherein, the method comprises the following steps: the pressure in the rodless cavity of a, detection power shovel hydraulic cylinder; B, in the time of the rodless cavity oil-feed of power shovel hydraulic cylinder and rod chamber oil return, according to the oil return flow velocity of the rod chamber of the detected value control power shovel hydraulic cylinder of the pressure in the rodless cavity of power shovel hydraulic cylinder, to control the excavation speed of power shovel.As above-mentioned, core technology design of the present invention is to control in real time by the rodless cavity pressure of detection scraper bowl hydraulic cylinder the oil return flow velocity of the rod chamber of scraper bowl hydraulic cylinder, and this has obtained good embodiment in said method.Particularly, in step b, comprise detected value and preset value are compared, in the time that detected value is greater than described preset value, control the rod chamber of described power shovel hydraulic cylinder from the oil return of non-throttling oil circuit, in the time that detected value is less than or equal to preset value, control the rod chamber of power shovel hydraulic cylinder from the oil return of throttling oil circuit.As above-mentioned, to those skilled in the art, can easily set this default force value (for example determining by normal experiment the force value that this is default) with needing according to the practical working situation of power shovel, therefore repeat no more here.
Below describe by reference to the accompanying drawings the preferred embodiment of the present invention in detail; but; the present invention is not limited to the detail in above-mentioned embodiment; within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition each the concrete technical characterictic described in above-mentioned detailed description of the invention, in reconcilable situation, can combine by any suitable mode.For fear of unnecessary repetition, the present invention is to the explanation no longer separately of various possible combinations.
In addition, between various embodiment of the present invention, also can be combined, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (12)
1. a power shovel hydraulic system, comprise scraper bowl hydraulic cylinder (1) and reversal valve (2), the rodless cavity of this scraper bowl hydraulic cylinder (1) is connected with main oil-feed oil circuit (3) and main oil return circuit (4) by described reversal valve (2) respectively with rod chamber, it is characterized in that, described power shovel hydraulic system also comprises control system, described control system comprises control device and pressure sensor (5), described pressure sensor (5) is connected with the rodless cavity of described scraper bowl hydraulic cylinder (1), to detect the pressure in this rodless cavity when the described rodless cavity oil-feed, described control device is connected with described pressure sensor (5), in the time of the rodless cavity oil-feed of described scraper bowl hydraulic cylinder (1) and rod chamber oil return, described control device is according to the oil return flow velocity of the rod chamber of scraper bowl hydraulic cylinder (1) described in the detected value control of described pressure sensor (5), to control the excavation speed of described power shovel.
2. power shovel hydraulic system according to claim 1, it is characterized in that, described control device comprises controller (6) and flow controlling unit, described flow controlling unit can switch between throttling oil circuit position and non-throttling oil circuit position, described pressure sensor (5) is connected with described controller (6) respectively with described flow controlling unit, in the time that the detected value of described pressure sensor (5) is less than default value, described controller (6) makes described flow controlling unit in throttling oil circuit position, in the time that the detected value of described pressure sensor (5) is greater than described default value, described controller (6) makes described flow controlling unit in non-throttling oil circuit position.
3. power shovel hydraulic system according to claim 2, it is characterized in that, described flow controlling unit is electromagnetic flow control valve (7), the rod chamber of described scraper bowl hydraulic cylinder (1) is connected with described reversal valve (2) by the first working oil path (8), and described electromagnetic flow control valve (7) is arranged in described the first working oil path (8).
4. power shovel hydraulic system according to claim 3, it is characterized in that, described throttling oil circuit is parallel with one way valve (10), the oil-in of described one way valve (10) is connected with described reversal valve (2), and oil-out is connected with the rod chamber of described scraper bowl hydraulic cylinder (1).
5. power shovel hydraulic system according to claim 2, it is characterized in that, described flow controlling unit comprises solenoid operated directional valve (11) and liquid flow control control valve (12), the rod chamber of described scraper bowl hydraulic cylinder (1) is connected with described reversal valve (2) by the first working oil path (8), described liquid flow control control valve (12) is arranged in described the first working oil path (8), the automatically controlled end of described pressure sensor (5) and described solenoid operated directional valve (11) is connected with described controller (6) respectively, the actuator port (11A) of described solenoid operated directional valve (11) is connected with the hydraulic control end of described liquid flow control control valve (12).
6. power shovel hydraulic system according to claim 5, it is characterized in that, described throttling oil circuit is parallel with one way valve (10), the oil-in of described one way valve (10) is connected with described reversal valve (2), and oil-out is connected with the rod chamber of described scraper bowl hydraulic cylinder (1).
7. power shovel hydraulic system according to claim 5, it is characterized in that, the oil return opening (11T) of described solenoid operated directional valve (11) is connected with fuel tank (13), oil-in (11P) is connected with pioneer pump (14), described solenoid operated directional valve (11) can switch to make described actuator port (11A) and (11P) conducting of described oil-in or with described oil return opening (11T) conducting.
8. according to the power shovel hydraulic system described in any one in claim 1 to 7, it is characterized in that, on described main oil-feed oil circuit (3), be provided with variable pump (15) and be connected with overflow oil circuit, on described overflow oil circuit, being provided with overflow valve.
9. according to the power shovel hydraulic system described in any one in claim 1 to 7, it is characterized in that, described reversal valve (2) comprises first guide's hydraulic control end (2a) and second guide's hydraulic control end (2b), in the time that hydraulic oil acts on described first guide's hydraulic control end (2a), described reversal valve (2) switches to the rod chamber oil-feed that makes described scraper bowl hydraulic cylinder (1), rodless cavity oil return, in the time that hydraulic oil acts on described second guide's hydraulic control end (2b), described reversal valve (2) switches to the rodless cavity oil-feed that makes described scraper bowl hydraulic cylinder (1), rod chamber oil return, described first guide's hydraulic control end (2a) and second guide's hydraulic control end (2b) are connected to guide's hydraulic control handle (16) by first guide's oil circuit and second guide's oil circuit respectively.
10. an excavator, it is characterized in that, this excavator comprises according to the power shovel hydraulic system described in any one in claim 1 to 9, can described power shovel being excavated by stretching out of the piston rod of described scraper bowl hydraulic cylinder (1), and the retraction of piston rod by described scraper bowl hydraulic cylinder (1) unloads described power shovel.
Control the method for power shovel excavation speed for 11. 1 kinds, it is characterized in that, the method comprises the following steps:
Pressure in the rodless cavity of a, detection power shovel hydraulic cylinder;
B, in the time of the rodless cavity oil-feed of described power shovel hydraulic cylinder and rod chamber oil return, according to the oil return flow velocity of the rod chamber of power shovel hydraulic cylinder described in the detected value control of the pressure in the rodless cavity of power shovel hydraulic cylinder, to control the excavation speed of described power shovel.
12. methods according to claim 11, it is characterized in that, in described step b, comprise described detected value and preset value are compared, in the time that described detected value is greater than described preset value, control the rod chamber of described power shovel hydraulic cylinder from the oil return of non-throttling oil circuit, in the time that described detected value is less than or equal to described preset value, control the rod chamber of described power shovel hydraulic cylinder from the oil return of throttling oil circuit.
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| 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 |
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| CN201410227924.5A 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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| CN103993623A true CN103993623A (en) | 2014-08-20 |
| CN103993623B CN103993623B (en) | 2016-12-07 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| CN108488121A (en) * | 2018-02-12 | 2018-09-04 | 宝鸡石油机械有限责任公司 | A kind of board migration device hydraulic pressure is from ambulation control method and control system |
| 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 |
| CN109570426A (en) * | 2019-01-22 | 2019-04-05 | 青岛海德马克智能装备有限公司 | A kind of clamping control system and radial forging operate machine |
| CN110332163A (en) * | 2019-07-25 | 2019-10-15 | 中国铁建重工集团股份有限公司 | Hydraulic control system and carry 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 |
| CN111395425A (en) * | 2020-04-02 | 2020-07-10 | 上海三一重机股份有限公司 | Bucket rod oil cylinder control system and method and excavator |
| CN111519677A (en) * | 2020-04-28 | 2020-08-11 | 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 |
| CN116770922A (en) * | 2022-03-08 | 2023-09-19 | 斗山工程机械（中国）有限公司 | Hydraulic system and excavator |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN108488121A (en) * | 2018-02-12 | 2018-09-04 | 宝鸡石油机械有限责任公司 | A kind of board migration device hydraulic pressure is from ambulation control method and control system |
| 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 |
| CN109570426A (en) * | 2019-01-22 | 2019-04-05 | 青岛海德马克智能装备有限公司 | A kind of clamping control system and radial forging operate machine |
| CN110332163A (en) * | 2019-07-25 | 2019-10-15 | 中国铁建重工集团股份有限公司 | Hydraulic control system and carry scraper |
| 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 |
| CN111395425A (en) * | 2020-04-02 | 2020-07-10 | 上海三一重机股份有限公司 | Bucket rod oil cylinder control system and method and excavator |
| CN111519677A (en) * | 2020-04-28 | 2020-08-11 | 三一重机有限公司 | Floating hydraulic system and engineering machinery |
| 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 |
| CN116770922A (en) * | 2022-03-08 | 2023-09-19 | 斗山工程机械（中国）有限公司 | Hydraulic system 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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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 DEVELOPMENT Co.,Ltd. WEINAN BRANCH Patentee before: ZOOMLION HEAVY INDUSTRY SCIENCE&TECHNOLOGY Co.,Ltd. |