CN104047914B - A kind of paver control of floating ironer system and paver - Google Patents
A kind of paver control of floating ironer system and paver Download PDFInfo
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- CN104047914B CN104047914B CN201410315371.9A CN201410315371A CN104047914B CN 104047914 B CN104047914 B CN 104047914B CN 201410315371 A CN201410315371 A CN 201410315371A CN 104047914 B CN104047914 B CN 104047914B
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- 238000007667 floating Methods 0.000 title claims abstract description 33
- 239000002828 fuel tank Substances 0.000 claims abstract description 18
- 239000012530 fluid Substances 0.000 claims description 64
- 239000003921 oil Substances 0.000 abstract description 50
- 239000010720 hydraulic oil Substances 0.000 abstract description 18
- 238000000034 method Methods 0.000 abstract description 13
- 230000007423 decrease Effects 0.000 description 6
- 230000001276 controlling effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 2
- 239000010426 asphalt Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- Road Paving Machines (AREA)
Abstract
The invention discloses a kind of paver control of floating ironer system, comprise: the big arm cylinder be connected with screed, the solenoid valve be connected with big arm cylinder, flow control valve, Y type three position four-way directional control valve, main relief valve is within the system set, first, second selector valve, back pressure valve and two position and four-way reversing valves, when paving, second selector valve makes return line and fuel tank disconnect, hydraulic oil in return line gets back to fuel tank through back pressure valve makes return line form system back pressure, if parking batch turning, because return line has back pressure, positive pressure is formed accordingly in rod chamber and rodless cavity, eliminate the degree of vacuum that rod chamber or rodless cavity internal cause are in oil suction state and exist, thus prevent from making because there is degree of vacuum screed to produce sinking to a certain degree or floating, reduce screed in paver stop-start process and cause the quality influence of impression and arch camber to road surface, effectively improve the flatness of paving concrete pavement.The invention also discloses the paver with this system.
Description
Technical field
The present invention relates to engineering machinery hydraulic control field, particularly relate to a kind of paver control of floating ironer system and there is the paver of this system.
Background technique
The expressway construction of China's development is had higher requirement to bituminous concrete paver working performance, especially to the requirement increasingly stringent of the flatness paved.First, paver needs to regulate the height of screed before paving, by the height that promotes or reduce screed with applicable different highway to the requirement of paving thickness, then, by the paver setting paving thickness, concrete or asphalt pavement are paved.Most of paver of the prior art adopts ironing-board float to pave, and namely in paving process, screed is in quick condition, and the rod chamber being connected to the left and right big arm cylinder of screed both sides is directly communicated with fuel tank with rodless cavity.Because hopper capacity or truck hold quantitative limitation, there is the continuous circulation of parking, batch turning, starting three steps in paver in paving process.Before parking batch turning, if the screed being in quick condition upwards floats, now the rod chamber of left and right big arm cylinder is in oil suction state, and this can make rod chamber there is certain vacuum degree, now stop, screed can sink to making road surface to produce impression because of the degree of vacuum of rod chamber existence; If the screed being in quick condition floats downwards, now the rodless cavity of left and right big arm cylinder is in oil suction state, this can make rodless cavity there is certain vacuum degree, now stops and starts to walk, and the degree of vacuum that screed can exist because of rodless cavity rises and makes road surface arch camber because Action of Gravity Field declines; The impression that the parking of paver in paving process and starting make road surface produce and arching phenomenon have a strong impact on the flatness on road surface.For reducing impression that stop-start process causes to road surface and arch camber, the technical way that those skilled in the art take is:
1, strengthen hopper capacity, reduce stop frequency, these means can only reduce the number of times that the impression on road surface and arch camber occur, and fundamentally cannot solve the problem of impression because stop-start brings to road surface and arch camber.
2, adopt transfer vehicle to carry out paving operation, cost is higher.
Summary of the invention
For the above-mentioned technical problem that paver of the prior art exists in paving process, the invention provides a kind of paver control of floating ironer system, utilize this system can solve the problem of impression and the arch camber caused to paving concrete pavement due to the parking of paver and starting in paving process, thus effectively can improve the flatness of paving concrete pavement.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of paver control of floating ironer system, for controlling the lifting of screed or floating, comprise: be connected to the left big arm cylinder of screed both sides, right big arm cylinder, and two solenoid valves be connected with the rod chamber of described left big arm cylinder, described right big arm cylinder respectively, each described solenoid valve has two working positions of two-way admittance and unidirectional oil-feed, and described paver control of floating ironer system also comprises:
Flow control valve, the conducting from its hydraulic fluid port A2 to its hydraulic fluid port B2 of described flow control valve, the flow rates controlled from its hydraulic fluid port B2 to its hydraulic fluid port A2;
Y type three position four-way directional control valve, the oil inlet P 1 of described Y type three position four-way directional control valve is communicated with main oil pipe road, its oil return inlet T 1 is communicated with return line, its actuator port A1 is communicated with the first oil circuit, described first oil circuit forms two branch roads and is communicated with the rodless cavity of right big arm cylinder with described left big arm cylinder respectively, and its actuator port B1 is communicated with the hydraulic fluid port A2 of described flow control valve; The hydraulic fluid port B2 of described flow control valve is communicated with the second oil circuit, and described second oil circuit forms two branch roads and is communicated with the rod chamber of right big arm cylinder with described left big arm cylinder respectively by described solenoid valve;
Main relief valve, is connected between described main oil pipe road and described return line;
First selector valve, in parallel with described main relief valve, to control the break-make on described main oil pipe road and described return line;
Second selector valve, is connected between described return line and fuel tank, to control the break-make of described return line and fuel tank;
Back pressure valve, in parallel with described second selector valve, the pressure controlling described return line forms back pressure to make system in return line;
Two position and four-way reversing valves, the hydraulic fluid port A3 of described two position and four-way reversing valves is all communicated with described return line with hydraulic fluid port B3, and its hydraulic fluid port C3 is communicated with described first oil circuit, and its hydraulic fluid port D3 is communicated with described second oil circuit; Described two position and four-way reversing valves are in primary importance, hydraulic fluid port A3 described in it and hydraulic fluid port C3 conducting described in it, hydraulic fluid port B3 described in it and hydraulic fluid port D3 conducting described in it; Described two position and four-way reversing valves are in the second place, and hydraulic fluid port A3 described in it, hydraulic fluid port B3, hydraulic fluid port C3 and hydraulic fluid port D3 all close.
Preferably, described back pressure valve is relief valve.
Preferably, described flow control valve is series flow control valve.
Preferably, described two position and four-way reversing valves are two four-way electromagnetic reversing valves.
Preferably, described first selector valve and the second selector valve are 2/2-way solenoid directional control valve.
Preferably, described Y type three position four-way directional control valve is Y type three-position four-way electromagnetic directional valve.
Present invention also offers a kind of paver, comprise screed, described paver has paver control of floating ironer system as above.
Compared with prior art, the beneficial effect of paver control of floating ironer system of the present invention is: paver control of floating ironer system of the present invention is by being connected to the Y type three position four-way directional control valve between main oil pipe road and return line, and the flow control valve be connected between Y type three position four-way directional control valve and left and right big arm cylinder is to control the rising of screed and to decline with the paving thickness regulating paver, the pressure that paver control of floating ironer system of the present invention controls in return line by being connected to the second selector valve between return line and fuel tank and the back pressure valve in parallel with this second selector valve, when screed highly being regulated before paving at paver, this second selector valve makes return line and fuel tank be in connected state, can by the flexible free adjustment screed height of the piston rod of left and right big arm cylinder, when paver is in paving process, second selector valve makes return line and fuel tank disconnect, hydraulic oil in return line need flow through back pressure valve just can get back to fuel tank, back pressure valve makes return line form system back pressure, if now paver parking batch turning, due to left big arm cylinder, the return line that the rod chamber of right big arm cylinder is communicated with rodless cavity has certain back pressure, certain positive pressure is formed accordingly in rod chamber and rodless cavity, eliminate rod chamber or rodless cavity internal cause and be in oil suction state (negative pressure state) and the certain vacuum degree that exists, thus prevent from making because there is degree of vacuum screed to produce sinking to a certain degree or floating, reduce screed in paver stop-start process and cause the quality influence of impression and arch camber to road surface, effectively improve the flatness of paver paving concrete pavement.
Accompanying drawing explanation
View when Fig. 1 is paver control of floating ironer Systematical control screed of the present invention lifting;
View when Fig. 2 is paver control of floating ironer Systematical control screed of the present invention decline;
Fig. 3 is the view of paver control of floating ironer system of the present invention when screed is in quick condition;
Fig. 4 is the structural representation of paver of the present invention.
Embodiment
For making those skilled in the art better understand technological scheme of the present invention, below in conjunction with the drawings and specific embodiments, the present invention is elaborated.
As Figure 1-4, a kind of paver control of floating ironer system disclosed by the invention, comprising:
Left big arm cylinder 1, right big arm cylinder 11, be connected to the both sides of screed 15;
There is the first solenoid valve 2, second solenoid valve 10 of two working positions of two-way admittance and unidirectional oil-feed, be connected with the rod chamber of left big arm cylinder 1, right big arm cylinder 11 respectively;
The conducting from hydraulic fluid port A2 to hydraulic fluid port B2, the flow control valve 4 that flow is limited from hydraulic fluid port B2 to hydraulic fluid port A2;
Y type three position four-way directional control valve 5, the oil inlet P 1 of Y type three position four-way directional control valve 5 is communicated with main oil pipe road, oil return inlet T 1 is communicated with return line, actuator port A1 is communicated with the first oil circuit 12, first oil circuit 12 forms two branch roads and is communicated with the rodless cavity of left big arm cylinder 1, right big arm cylinder 11 respectively, and actuator port B1 is communicated with the hydraulic fluid port A2 of flow control valve 4;
The hydraulic fluid port B2 of flow control valve 4 is communicated with the second oil circuit 13, and the second oil circuit 13 forms two branch roads and is communicated with the rod chamber of left big arm cylinder 1, right big arm cylinder 11 respectively by the first solenoid valve 2, second solenoid valve 10;
Be connected to the main relief valve 6 between main oil pipe road and return line;
In parallel with main relief valve 6, to control the first selector valve 7 of the break-make on main oil pipe road and return line;
Be connected between return line and fuel tank, to control the second selector valve 8 of the break-make of return line and fuel tank;
In parallel with the second selector valve 8, control the pressure of return line with the back pressure valve 9 making system form back pressure in return line;
The hydraulic fluid port A3 of two position and four-way reversing valve 3, two position and four-way reversing valves, hydraulic fluid port B3 is all communicated with return line, and hydraulic fluid port C3 is communicated with the first oil circuit, and hydraulic fluid port D3 is communicated with the second oil circuit; Two position and four-way reversing valves 3 are in primary importance, hydraulic fluid port A3 and hydraulic fluid port C3 conducting, and hydraulic fluid port B3 and hydraulic fluid port D3 conducting, two position and four-way reversing valves are in the second place, hydraulic fluid port A3, hydraulic fluid port B3, hydraulic fluid port C3, and hydraulic fluid port D3 all closes.
Left big arm cylinder 1, right big arm cylinder 11 stretching with the decline and the rising that control screed 15 by piston rod, thus regulating the height of screed 15 that paver is paved the road surface of different-thickness, the piston rod of left big arm cylinder 1, right big arm cylinder 11 is stretched by the control realization of Y type three position four-way directional control valve 5.
The steady lifting that the effect of flow control valve 4 is by controlling left big arm cylinder 1, the steady lifting of piston of right big arm cylinder 11 controls screed 15; When screed 15 needs to rise, hydraulic oil in main oil pipe road enters the hydraulic fluid port A2 of flow control valve 4 via Y type three position four-way directional control valve 5, flowing out from hydraulic fluid port B2 then not by any restriction of flow control valve 4, then the rod chamber of left big arm cylinder 1, right big arm cylinder 11 is entered, to make its piston rod shrink under the effect of hydraulic oil, thus promote the height of screed 15; When screed 15 needs lower timing, the hydraulic oil of the rod chamber of left big arm cylinder 1, right big arm cylinder 11 enters from the hydraulic fluid port B2 of flow control valve 4, flow out from hydraulic fluid port A2, now the flow velocity of hydraulic oil is subject to flow control valve 4 and limits, to stop to sink fast because screed 15 is subject to Action of Gravity Field, add stationarity when screed 15 declines.
Should be appreciated that, flow control valve 4 can be common throttle valve or series flow control valve, and because series flow control valve can make to produce stable flow by its hydraulic oil, thus make the decline of screed 15 more steady, flow control valve 4 preferentially can select series flow control valve.
The effect of main relief valve 6 is the working pressure controlling whole system, the pressure namely in main oil pipe road.When for a certain reason, when in main oil pipe road, the pressure of hydraulic oil is higher than working pressure set by main relief valve 6, main relief valve 6 starts overflow, in case hydraulic actuator, hydraulic pipe line and the hydraulic control component in locking system overpressure damage system.
When paver paves, if make screed 15 be in quick condition, the rod chamber of left big arm cylinder 1, right big arm cylinder 11 need be communicated with directly or indirectly with rodless cavity, for this reason, by two position and four-way reversing valves 3 by rod chamber and rodless cavity indirect communication.
The effect of back pressure valve 9 is, paver is in paving process, screed 15 is in quick condition all the time, now, second selector valve 8 makes return line and fuel tank disconnect, hydraulic oil in return line need flow through back pressure valve 9 just can get back to fuel tank, back pressure valve 9 has certain pilot pressure, and make return line form system back pressure, if now paver parking batch turning, due to left big arm cylinder 1, the return line that the rod chamber of right big arm cylinder 11 is communicated with rodless cavity has certain back pressure, certain positive pressure is formed accordingly in rod chamber and rodless cavity, eliminate rod chamber or rodless cavity internal cause and be in oil suction state (negative pressure state) and the certain vacuum degree that exists, thus prevent from making because there is degree of vacuum screed 15 to produce sinking to a certain degree or floating, reduce screed 15 in paver stop-start process and cause the quality influence of impression and arch camber to road surface, effectively improve the flatness of paver paving concrete pavement.
Kind for making return line form the back pressure valve 9 of system back pressure has multiple, as: relief valve, reduction valve, Pilot operated check valve.
Particularly, paver control of floating ironer system of the present invention selects relief valve as back pressure valve 9 to control the pressure of return line.Generally, the pressure that return line and the hydraulic element be attached thereto can bear is less than the pressure (work system pressure) in main oil pipe road usually, pilot pressure as the relief valve of optional native system is 1Mp, namely the oil pressure relief of relief valve is 1Mp, the pressure on main oil pipe road is 20Mp, and namely system pressure is 20Mp.
For making the more deep understanding of those skilled in the art paver control of floating ironer of the present invention system, below in conjunction with accompanying drawing, to paver control of floating ironer system of the present invention control the lifting of screed 15, decline, float time system mode be described in detail.
Should be appreciated that, this Y type three position four-way directional control valve 5, first selector valve 7, second selector valve 8 involved by paver control of floating ironer system, two position and four-way reversing valves 3 can be all hydraulic control valves, also can be solenoid electric valve, might as well, Y type three position four-way directional control valve 5 is preferably Y type three-position four-way electromagnetic directional valve, and the first selector valve 7 and the second selector valve 8 are preferably 2/2-way solenoid directional control valve, and two position and four-way reversing valves 3 are preferably two four-way electromagnetic reversing valves.
1, system mode when screed 15 promotes.
As shown in Figure 1, the Y2 of the first solenoid valve 2, second solenoid valve 10, Y type three position four-way directional control valve 5 end, two position and four-way reversing valve 3, first selector valves 7 all electric, the second selector valve 8 dead electricity.
Hydraulic oil is entered the oil inlet P 1 of Y type three position four-way directional control valve 5 by main oil pipe road by oil sources P, flow out from its actuator port B1, the second oil circuit 13 is flowed through by the one-way valve of flow control valve 4, then two branch roads are formed, respectively by the first solenoid valve 2, second solenoid valve 10 enters left big arm cylinder 1, the rod chamber of right big arm cylinder 11, promote piston rod under pressure to move upward, piston rod drives screed 15 to promote, hydraulic oil is from left big arm cylinder 1, the rodless cavity of right big arm cylinder 11 flows out and converges and flow through the actuator port A1 that the first oil circuit 12 enters Y type three position four-way directional control valve, flow out from oil return inlet T 1, and flow back to fuel tank.
2, system mode when screed 15 declines
As shown in Figure 2, the Y1 of the first solenoid valve 2, second solenoid valve 10, Y type three position four-way directional control valve 5 end, two position and four-way reversing valve 3, first selector valves 7 all electric, the second selector valve 8 dead electricity.
Hydraulic oil is entered the oil inlet P 1 of Y type three position four-way directional control valve 5 by main oil pipe road by oil sources P, flow out from its actuator port A1, flow through the first oil circuit 12, then two branch roads are formed, enter left big arm cylinder 1 respectively, the rodless cavity of right big arm cylinder 11, promote piston rod under pressure to move downward, piston rod drives screed 15 to decline, hydraulic oil is from left big arm cylinder 1, the rod chamber of right big arm cylinder 11 flows out and converges and flow through the hydraulic fluid port B2 that the second oil circuit 13 enters flow control valve 4, hydraulic oil flow in flow control valve 4 is restricted, flow out from hydraulic fluid port A2 with less flow velocity, to stop to sink fast because screed 15 is subject to Action of Gravity Field, add stationarity when screed 15 declines.Enter the actuator port B1 of Y type three position four-way directional control valve from the hydraulic oil of flow control valve 4 outflow, flow out from oil return inlet T 1, and flow back to fuel tank.
3, screed 15 float (paver pave state) time system mode
As shown in Figure 3, the second selector valve 8, first solenoid valve 2, second solenoid valve 10 all electric, two position and four-way reversing valves 3, Y type three position four-way directional control valve 5, first selector valve 7 all dead electricity.
Hydraulic oil by main oil pipe road, flows through the first selector valve 7 being on state by oil sources P, after the hydraulic oil of the first selector valve 7 outflow flows through back pressure valve 9 again, flow back to fuel tank.Now, the hydraulic fluid port A3 of two position and four-way reversing valves 3, hydraulic fluid port B3 is all communicated with return line, and hydraulic fluid port C3 is communicated with the rodless cavity of left big arm cylinder 1, right big arm cylinder 11, and hydraulic fluid port D3 is communicated with the rod chamber of left big arm cylinder 1, right big arm cylinder 11.Because hydraulic oil has flowed through back pressure valve 9, return line is made to create certain back pressure, the return line with certain back pressure is communicated with rodless cavity with the rod chamber of left big arm cylinder 1, right big arm cylinder 11 indirectly by two position and four-way reversing valves 3, make rod chamber and rodless cavity there is certain positive pressure, left big arm cylinder 1, right big arm cylinder 11 drive paver screed 15 to float to carry out paving operation in the oil hydraulic circuit formed with two position and four-way reversing valves 3 simultaneously.
If now paver parking batch turning, due to the rod chamber be communicated with by two position and four-way reversing valves 3 to return line corresponding with rodless cavity there is certain positive pressure, eliminate rod chamber or rodless cavity internal cause and be in oil suction state (negative pressure state) and the certain vacuum degree that exists, thus prevent from making because there is degree of vacuum screed 15 to produce sinking to a certain degree or floating, reduce screed 15 in paver stop-start process and cause the quality influence of impression and arch camber to road surface, effectively improve the flatness of paver paving concrete pavement.
As shown in Figure 4, present invention also offers one and comprise screed 15, this paver has paver control of floating ironer system as above.
Claims (7)
1. a paver control of floating ironer system, for controlling the lifting of screed or floating, comprise: be connected to the left big arm cylinder of screed both sides, right big arm cylinder, and two solenoid valves be connected with the rod chamber of described left big arm cylinder, described right big arm cylinder respectively, each described solenoid valve has two working positions of two-way admittance and unidirectional oil-feed, it is characterized in that, also comprise:
Flow control valve, the conducting from its hydraulic fluid port A2 to its hydraulic fluid port B2 of described flow control valve, the flow rates controlled from its hydraulic fluid port B2 to its hydraulic fluid port A2;
Y type three position four-way directional control valve, the oil inlet P 1 of described Y type three position four-way directional control valve is communicated with main oil pipe road, its oil return inlet T 1 is communicated with return line, its actuator port A1 is communicated with the first oil circuit, described first oil circuit forms two branch roads and is communicated with the rodless cavity of right big arm cylinder with described left big arm cylinder respectively, and its actuator port B1 is communicated with the hydraulic fluid port A2 of described flow control valve; The hydraulic fluid port B2 of described flow control valve is communicated with the second oil circuit, and described second oil circuit forms two branch roads and is communicated with the rod chamber of right big arm cylinder with described left big arm cylinder respectively by described solenoid valve;
Main relief valve, is connected between described main oil pipe road and described return line;
First selector valve, in parallel with described main relief valve, to control the break-make on described main oil pipe road and described return line;
Second selector valve, is connected between described return line and fuel tank, to control the break-make of described return line and fuel tank;
Back pressure valve, in parallel with described second selector valve, the pressure controlling described return line forms back pressure to make system in return line;
Two position and four-way reversing valves, the hydraulic fluid port A3 of described two position and four-way reversing valves is all communicated with described return line with hydraulic fluid port B3, and its hydraulic fluid port C3 is communicated with described first oil circuit, and its hydraulic fluid port D3 is communicated with described second oil circuit; Described two position and four-way reversing valves are in primary importance, hydraulic fluid port A3 described in it and hydraulic fluid port C3 conducting described in it, hydraulic fluid port B3 described in it and hydraulic fluid port D3 conducting described in it; Described two position and four-way reversing valves are in the second place, and described in it, hydraulic fluid port A3, hydraulic fluid port B3, hydraulic fluid port C3 and hydraulic fluid port D3 all close.
2. paver control of floating ironer system according to claim 1, is characterized in that, described back pressure valve is relief valve.
3. paver control of floating ironer system according to claim 1, is characterized in that, described flow control valve is series flow control valve.
4. paver control of floating ironer system according to claim 1, is characterized in that, described two position and four-way reversing valves are two four-way electromagnetic reversing valves.
5. paver control of floating ironer system according to claim 1, is characterized in that, described first selector valve and the second selector valve are 2/2-way solenoid directional control valve.
6. paver control of floating ironer system according to claim 1, is characterized in that, described Y type three position four-way directional control valve is Y type three-position four-way electromagnetic directional valve.
7. a paver, comprises screed, it is characterized in that, described paver is just like the paver control of floating ironer system according to any one of claim 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410315371.9A CN104047914B (en) | 2014-07-03 | 2014-07-03 | A kind of paver control of floating ironer system and paver |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410315371.9A CN104047914B (en) | 2014-07-03 | 2014-07-03 | A kind of paver control of floating ironer system and paver |
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| CN104047914A CN104047914A (en) | 2014-09-17 |
| CN104047914B true CN104047914B (en) | 2016-03-09 |
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| CN106523446B (en) * | 2015-09-11 | 2018-08-14 | 徐工集团工程机械股份有限公司 | hydraulic control system and paver |
| CN106593981A (en) * | 2016-12-15 | 2017-04-26 | 北汽福田汽车股份有限公司 | Sweeping plate lifting hydraulic system, sweeping machine hydraulic system and sweeping machine |
| CN108316096B (en) * | 2018-01-22 | 2023-08-04 | 柳工无锡路面机械有限公司 | Integrated control hydraulic system of road paver and control method thereof |
| CN108442213B (en) * | 2018-05-04 | 2023-11-21 | 徐工集团工程机械股份有限公司 | Multifunctional control system of paver screed |
| CN108716490B (en) * | 2018-08-23 | 2023-08-04 | 安徽合力股份有限公司 | Hydraulic system of lifting appliance of stacker |
| CN109340205B (en) * | 2018-12-21 | 2023-10-24 | 北京三一智造科技有限公司 | Floatable oil cylinder and engineering machinery |
| CN110656558B (en) * | 2019-09-10 | 2024-04-26 | 江苏四明工程机械有限公司 | Four-crawler intelligent slipform paver and upright post floating electrohydraulic control system thereof |
| CN113719482B (en) * | 2021-08-30 | 2023-07-18 | 湖南三一中益机械有限公司 | Hydraulic system and paver |
| CN114060337B (en) * | 2021-11-25 | 2023-05-30 | 广东精铟海洋工程股份有限公司 | Hydraulic control system of double-ring beam hydraulic bolt lifting device |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN104047914A (en) | 2014-09-17 |
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