CN101397770B - Milling machine outrigger elevator apparatus and pavement milling machine using the same - Google Patents
Milling machine outrigger elevator apparatus and pavement milling machine using the same Download PDFInfo
- Publication number
- CN101397770B CN101397770B CN2008101745228A CN200810174522A CN101397770B CN 101397770 B CN101397770 B CN 101397770B CN 2008101745228 A CN2008101745228 A CN 2008101745228A CN 200810174522 A CN200810174522 A CN 200810174522A CN 101397770 B CN101397770 B CN 101397770B
- Authority
- CN
- China
- Prior art keywords
- oil cylinder
- described left
- proportional reversing
- reversing valve
- milling machine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The invention discloses a support lifting device of a milling machine, which comprises a left support oil cylinder and a right support oil cylinder. The support lifting device is used for adjusting the heights of a left leg and a right leg by flexible actions of the left support oil cylinder and the right support oil cylinder. The support lifting device also comprises a left proportional and directional valve and a right proportional and directional valve which are communicated with the left support oil cylinder and the right support oil cylinder respectively through oil circuits and used for controlling the speed of the flexible actions of the left support oil cylinder and the right support oil cylinder; and a left pressure compensator and a right pressure compensator, which are also included by the device, and are respectively installed on the oil circuits between the left proportional and directional valve and the left support oil cylinder and between the right proportional and directional valve and the right support oil cylinder and used for stabilizing the pressures of the left support oil cylinder and the right support oil cylinder. The proportional valves can not only reverse the directions, but also can adjust the flow rate, thereby being capable of adjusting the direction and the speed of the flexible actions of the support oil cylinders to realize the infinitely variable control of the lifting speed of the legs with comparatively high synchronous precision; and the pressure compensators can stabilize the pressure of the oil cylinder and eliminate the load difference between the support oil cylinders so as to ensure no interaction in the actions of the two oil cylinders. The invention also discloses a road milling machine using the support lifting device.
Description
Technical field
The present invention relates to finishing equipment or the device that the road surface processes, be specifically related to the milling machine support lifting device and use the pavement milling machine of this support lifting device.
Background technology
Pavement milling machine (hereinafter to be referred as milling machine) is a kind of plant equipment of maintenance of surface efficiently, and the excavation that is mainly used in asphalt concrete pavements such as highway, airport, goods yard, parking lot is overhauled.This milling machine, that can remove the road surface efficiently gathers around bag, wave, but also excavated pavement hole groove or groove, it is flat also to can be used for milling of the plucking of cement concrete pavement or surface layer faulting of slab ends.
In order to guarantee the construction quality of milling face, need adjust the height of milling machine supporting leg according to the job site situation.At present, the supporting leg lifting control form that is used for milling machine both at home and abroad has two kinds, and a kind of is independent lifting, and another kind is a synchronization lifting, is summarized as follows:
Lifting separately is difficult to realize each supporting leg adjustable height unanimity, is unfavorable for beginning the lifting of combination adjustment supporting leg in milling or the milling process, thereby can't adjusts the milling degree of depth rapidly and accurately, causes milling surface construction non-conformity of quality to close requirement easily.
Synchronization lifting, because of milling machine supporting leg (particularly two front leg struts) oil cylinder varying in weight that feeding unit bears, realize that the structure of synchronization lifting is comparatively complicated, also easily produce the problem of interfering mutually between each support oil cylinder; Simultaneously, do not take the step-less adjustment measure because of the control of supporting leg rising or falling speed, wave in the course of work at feeding unit, supporting leg bears varying load, and its synchronization accuracy is relatively poor.In addition,, will make supporting leg effectively not locked, and easily cause milling machine to tumble and cause the accident in case pipeline goes wrong.
Summary of the invention
In view of this, but the invention provides a kind of milling machine support lifting device of synchronization lifting simple in structure, can avoid the mutual interference of each support oil cylinder action, its synchronization accuracy height.On this basis, the invention provides a kind of pavement milling machine that uses this support lifting device.
For solving above technical problem, milling machine support lifting device provided by the invention comprises left and right support oil cylinder, is used for adjusting by the expanding-contracting action of described left and right support oil cylinder respectively the height of left and right supporting leg, also comprises:
Left and right proportional reversing valve, described left and right proportional reversing valve are communicated with described left and right support oil cylinder by oil circuit respectively, are used to control the expanding-contracting action speed of described left and right support oil cylinder;
Left and right pressure compensator is installed in respectively between described left and right proportional reversing valve and described left and right support oil cylinder on the oil circuit, is used to stablize the pressure of described left and right support oil cylinder.
Preferably, also comprise left and right switch reversal valve, be installed in respectively between described left and right proportional reversing valve and described left and right support oil cylinder on the oil circuit, be used to control the switching of oil circuit between described left and right proportional reversing valve and described left and right support oil cylinder.
Preferably, described left and right switch reversal valve is a Solenoid ball valve.
Preferably, also comprise left and right one way valve, be installed in respectively on the described left and right proportional reversing valve import oil circuit, be used to control the reverse flow of oil circuit between described left and right proportional reversing valve and described left and right support oil cylinder.
Be connected by screw between described left and right switch reversal valve, described left and right one way valve and the described left and right support oil cylinder.
Preferably, described left and right proportional reversing valve is a three position four-way directional control valve, and wherein, the A mouth of described left and right proportional reversing valve, B mouth are connected with the rod chamber or the rodless cavity of described left and right support oil cylinder respectively.
Preferably, described left and right proportional reversing valve is electric proportional reversing valve.
Preferably, also comprise left and right electron-amplifier, be connected with the coil of described left and right proportional reversing valve respectively, be used to amplify the control signal of telecommunication of described left and right proportional reversing valve.
Pavement milling machine provided by the invention comprises above-mentioned milling machine support lifting device.
Compared with prior art, milling machine support lifting device synchronization accuracy height of the present invention, and the mutual interference that can avoid each support oil cylinder to move, particularly: proportional reversing valve is set in the oil circuit, can not only commutate, can also regulate flow, thereby can regulate the direction and the speed of support oil cylinder expanding-contracting action simultaneously, realize the step-less adjustment of supporting leg rising or falling speed, and synchronization accuracy is higher; Pressure compensator is set in the oil circuit, can stablizes oil cylinder working-pressure, eliminate the load difference between support oil cylinder, guarantee that the action of two support oil cylinders does not influence each other; Proportional reversing valve, pressure compensator are conventional Hydraulic Elements, help simplified structure, reduce cost.
Especially, the switch reversal valve is set on the oil circuit, utilizes its locking action, can make left and right oil circuit separate, eliminate interference effect; Simultaneously, on the import oil circuit of proportional reversing valve one way valve is installed, can be prevented the reverse flow of hydraulic oil, guarantee not produce between the left and right oil circuit interference.Further, one way valve, the combination of switch reversal valve are connected with screw with support oil cylinder, and the centre need not sebific duct, steel pipe connects, can be when accident appear in pipeline, and supporting leg can effectively be locked, thereby eliminates the danger of tumbling, and avoids causing the accident.
Pavement milling machine of the present invention, left and right supporting leg is lifting and synchronization lifting separately, between supporting leg elevating movement separate, thereby can be convenient, fast, adjust the milling and planing drum incision by the degree of depth on milling road surface, angle exactly, help to improve construction quality, its application prospect is better.
Description of drawings
Fig. 1 is the hydraulic schematic diagram of milling machine support lifting device one preferred embodiment of the present invention;
Fig. 2 is the assembling schematic diagram of left-handed opening reversal valve among Fig. 1, left one way valve and left branch leg oil cylinder.
The specific embodiment
Basic design of the present invention is to be provided with in the oil circuit of left and right support oil cylinder place: left and right proportional reversing valve, so that control the expanding-contracting action speed of described left and right support oil cylinder, realize supporting leg rising or falling speed step-less adjustment, and improve supporting leg synchronization lifting precision; Left and right pressure compensator so that stablize the pressure of described left and right support oil cylinder, guarantees that both do not interfere in action.
Specify below in conjunction with embodiment and accompanying drawing.
Please refer to Fig. 1, this figure is the hydraulic schematic diagram of milling machine support lifting device one preferred embodiment of the present invention.Milling machine support lifting device shown in Figure 1 comprises: hydraulic pressure original papers such as left branch leg oil cylinder 1, right support oil cylinder 2, left proportional reversing valve 3, right proportional reversing valve 4, left pressure compensator 5, right pressure compensator 6, wherein:
Left branch leg oil cylinder 1, right support oil cylinder 2 by the height of its expanding-contracting action adjustment left branch leg, right supporting leg, are promptly realized the adjusting of the lifting of left branch leg, right supporting leg respectively.
Left side proportional reversing valve 3, right proportional reversing valve 4 are communicated with left branch leg oil cylinder 1, right support oil cylinder 2 by oil circuit respectively, are used to prevent the expanding-contracting action speed of left branch leg oil cylinder 1, right support oil cylinder 2.Because left proportional reversing valve 3, right proportional reversing valve 4 can not only commutate, can also regulate flow, thereby can regulate the direction and the speed of the expanding-contracting action of left branch leg oil cylinder 1, right support oil cylinder 2 simultaneously, thereby realize the step-less adjustment of left and right supporting leg rising or falling speed, improve supporting leg synchronization lifting precision.
Left side pressure compensator 5, right pressure compensator 6 are installed in respectively on left proportional reversing valve 3, right proportional reversing valve 4 and left branch leg oil cylinder support oil cylinder 1,2 oil circuits of right support oil cylinder, are used for stablizing the pressure of left branch leg oil cylinder 1, right support oil cylinder 2.Thus, utilize left pressure compensator 5,6 effects of right pressure compensator, make left branch leg oil cylinder 1, right support oil cylinder 2 not be subjected to the influence of system pressure and load pressure, make that each oil circuit is separate, mutually noninterfere, thus guarantee left and right supporting leg synchronization lifting.
Above-mentioned milling machine support lifting device synchronization accuracy height, and the mutual interference that can avoid each support oil cylinder to move, particularly: proportional reversing valve is set in the oil circuit, can not only commutate, can also regulate flow, thereby can regulate the direction and the speed of support oil cylinder expanding-contracting action simultaneously, realize the step-less adjustment of supporting leg rising or falling speed, and synchronization accuracy be higher; Pressure compensator is set in the oil circuit, can stablizes oil cylinder working-pressure, eliminate the load difference between support oil cylinder, guarantee that the action of two support oil cylinders does not influence each other.In addition, proportional reversing valve, pressure compensator are conventional Hydraulic Elements, help simplified structure, reduce cost.
The present invention also can further improve, and is summarized as follows:
As described in Figure 1, also comprise left-handed opening reversal valve 5, right switch reversal valve 6, wherein: left-handed opening reversal valve 5 is installed on left proportional reversing valve 3 and 1 oil circuit of left branch leg oil cylinder, is used to prevent the switching of left proportional reversing valve 3 and 1 oil circuit of left branch leg oil cylinder; Right switch reversal valve 6 is installed on right proportional reversing valve 4 and 2 oil circuits of right support oil cylinder, is used to control the switching of right proportional reversing valve 4 and 2 oil circuits of right support oil cylinder.Thus, utilize the locking action of left-handed opening reversal valve 5, right switch reversal valve 6, make left and right oil circuit separate, mutually noninterfere.
Preferably, left-handed opening reversal valve 5, right switch reversal valve 6 are Solenoid ball valve, each hydraulic fluid port of valve body is communicated with or disconnects by the relative position of conversion steel ball in valve body, have characteristics such as pressurize, reliable in action height, reaction speed are fast.
As described in Figure 1, also comprise left one way valve 9, right one way valve 10, wherein: left one way valve 9 is installed on the left proportional reversing valve 3 import oil circuits, is used to prevent the reverse flow of 1 oil circuit between left proportional reversing valve 3 and left branch leg oil cylinder; Right one way valve 10 is installed on the right proportional reversing valve 4 import oil circuits, is used to prevent the reverse flow of 2 oil circuits between right proportional reversing valve 4 and right support oil cylinder.Thus, utilize the unidirectional logical oil effect of left one way valve 9, right one way valve 10, make left and right oil circuit separate, eliminate mutual interference.
As shown in Figure 1, left side proportional reversing valve 3, right proportional reversing valve 4 are preferably three position four-way directional control valve, have simple in structure, control characteristics easily, wherein: the P mouth of left proportional reversing valve 3, right proportional reversing valve 4 connects oil-feed path 11 respectively, and the O mouth of left proportional reversing valve 3, right proportional reversing valve 4 connects way to cycle oil 12 respectively; In addition, the A mouth of left proportional reversing valve 3, B mouth are connected with the rod chamber or the rodless cavity of left branch leg oil cylinder 1 respectively; A mouth, the B mouth of right proportional reversing valve 4 are connected with the rod chamber or the rodless cavity of right support oil cylinder 2 respectively.Especially, left one way valve 9, right one way valve 10 are installed respectively,, are guaranteed not produce between the left and right oil circuit interference effect to prevent the reverse flow of left and right oil circuit at the P mouth of the P of left proportional reversing valve 3 mouth, right proportional reversing valve 4.
Preferably, left proportional reversing valve 3, right proportional reversing valve 4 are electric proportional reversing valve, have the characteristics easily of controlling.Give left proportional reversing valve 3, right proportional reversing valve 4 coil input electrical signals, just can according to the polarity of input electrical signal and big or small provider to and flow-control, realize the direction and the speed adjusting of the expanding-contracting action of left branch leg oil cylinder 1, right support oil cylinder 2.
Preferably, also comprise left and right electron-amplifier (figure does not show), the coil with left proportional reversing valve 3, right proportional reversing valve 4 is connected respectively, is used to amplify its control signal of telecommunication.Thus, left and right electric proportional reversing valve respectively with left and right electron-amplifier cooperating, provide an an amount of electric current by left and right electron-amplifier to left and right electric proportional reversing valve, so that the adjustment amount of valve is consistent with the input signal of supplying with left and right electron-amplifier.
It should be noted that described left proportional reversing valve 3, right proportional reversing valve 4 also can be taked the proportional reversing valve of other structure or type, its concrete connection is different with the foregoing description.But because of the concrete type selecting of relevant proportional reversing valve and with the connected mode of other Hydraulic Elements be prior art, it is implemented according to relevant document easily, does not repeat them here.
The present invention also is optimized the assembling mode of each element, is summarized as follows:
See also Fig. 2, this figure is the assembling schematic diagram of left-handed opening reversal valve among Fig. 1, left one way valve, left branch leg oil cylinder.Wherein, 2 be connected by screw respectively between left-handed opening reversal valve 7, left one way valve 9 and the left branch leg oil cylinder 1; Similarly, 2 also can be connected by screw between right switch reversal valve 8, right one way valve 10 and the right support oil cylinder.Need not sebific duct, steel pipe connection in the middle of this connected mode, supporting leg, when accident appearred in pipeline, supporting leg can effectively be locked, thereby eliminated the danger of tumbling, and avoided occurring accident.
Preamble has carried out detailed description to milling machine support lifting device structure of the present invention, below to its course of work brief description:
When only needing " left branch leg oil cylinder 1 " single movement, just only give the signal of telecommunication that coil is an amount of in the left proportional reversing valve 3 (being electric proportional reversing valve), give left-handed opening reversal valve 7 (being Solenoid ball valve) the coil Y7 signal of telecommunication simultaneously, the hydraulic oil that P is made a slip of the tongue enters the rod chamber or the rodless cavity of left branch leg oil cylinder 1, the rising or the decline of realization milling machine left branch leg from A mouth or B mouth through left proportional reversing valve 3 after.Wherein, the independence of left branch leg oil cylinder 1 action is guaranteed by left-handed opening reversal valve 7.
When only needing " right support oil cylinder 2 " single movement, just only give the signal of telecommunication that coil is an amount of in the right proportional reversing valve 4 (being electric proportional reversing valve), give right switch reversal valve 8 (being Solenoid ball valve) the coil Y8 signal of telecommunication simultaneously, the hydraulic oil that P is made a slip of the tongue enters the rod chamber or the rodless cavity of right support oil cylinder 1 from A mouth or B mouth through right proportional reversing valve 4 after, realize the rising or the decline of milling machine right side supporting leg.Wherein, the independence of right support oil cylinder 2 actions is guaranteed by right switch reversal valve 8.
When need left branch leg oil cylinder 1 and right support oil cylinder 2 rising synchronously, just give left electric proportional reversing valve 3 coil Y3a, the identical an amount of signal of telecommunication of right electric proportional reversing valve 4 coil Y4a simultaneously, give left-handed opening reversal valve 7, the right switch reversal valve 8 coil signals of telecommunication simultaneously, realize the rodless cavity oil-feed of left branch leg oil cylinder 1, right support oil cylinder 2, the rod chamber oil return, thus the synchronous rising of milling machine made.Wherein, both rise synchronism by the electric proportional reversing valve 3 coil Y3a in a left side, an amount of signal of telecommunication of right electric proportional reversing valve 4 coil Y4a, and the pressure that left pressure compensator 5, right pressure compensator 5 set guarantees.
When need left branch leg oil cylinder 1 and right support oil cylinder 2 decline synchronously, just give left electric proportional reversing valve 3 coil Y3b, the identical an amount of signal of telecommunication of right electric proportional reversing valve 4 coil Y4b simultaneously, give left-handed opening reversal valve 7, the right switch reversal valve 8 coil signals of telecommunication simultaneously, realize the rod chamber oil-feed of left branch leg oil cylinder 1, right support oil cylinder 2, the rodless cavity oil return, thus the synchronous decline of milling machine made.Wherein, both descend synchronism by electric proportional reversing valve 3 coil Y3b, an amount of signal of telecommunication of right electric proportional reversing valve 4 coil Y4b, and the pressure that left pressure compensator 5, right pressure compensator 5 set guarantees.
In the foregoing description, the control method that makes up by band pressure compensator and electric proportional reversing valve guarantees two supporting leg synchronization liftings, can control in real time the displacement of two support oil cylinders simultaneously according to system's needs thus; Though the load of bearing on each support oil cylinder there are differences, behind the employing pressure compensator, action mutually noninterfere in the time of can guaranteeing two support oil cylinders motions.
Use the pavement milling machine of above-mentioned milling machine support lifting device, left and right supporting leg is lifting and synchronization lifting separately, elevating movement is separate between supporting leg, thereby can adjust the milling and planing drum incision convenient, fast, exactly by the degree of depth on milling road surface, angle, help to improve construction quality, its application prospect is better.
The above only is a preferred implementation of the present invention, should be pointed out that above-mentioned preferred implementation should not be considered as limitation of the present invention, and protection scope of the present invention should be as the criterion with claim institute restricted portion.For those skilled in the art, without departing from the spirit and scope of the present invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. a milling machine support lifting device comprises left and right support oil cylinder, is used for adjusting by the expanding-contracting action of described left and right support oil cylinder respectively the height of left and right supporting leg, it is characterized in that, also comprises:
Left and right proportional reversing valve, described left and right proportional reversing valve are communicated with described left and right support oil cylinder by oil circuit respectively, are used to control the expanding-contracting action speed of described left and right support oil cylinder;
Left and right pressure compensator is installed in respectively between described left and right proportional reversing valve and described left and right support oil cylinder on the oil circuit, is used to stablize the pressure of described left and right support oil cylinder.
2. milling machine support lifting device as claimed in claim 1, it is characterized in that, also comprise left and right switch reversal valve, be installed in respectively between described left and right proportional reversing valve and described left and right support oil cylinder on the oil circuit, be used to control the switching of oil circuit between described left and right proportional reversing valve and described left and right support oil cylinder.
3. milling machine support lifting device as claimed in claim 2 is characterized in that, described left and right switch reversal valve is a Solenoid ball valve.
4. milling machine support lifting device as claimed in claim 3, it is characterized in that, also comprise left and right one way valve, be installed in respectively on the described left and right proportional reversing valve import oil circuit, be used to control the reverse flow of oil circuit between described left and right proportional reversing valve and described left and right support oil cylinder.
5. milling machine support lifting device as claimed in claim 4 is characterized in that, is connected by screw between described left and right switch reversal valve, described left and right one way valve and the described left and right support oil cylinder.
6. milling machine support lifting device as claimed in claim 1, it is characterized in that, described left and right proportional reversing valve is a three position four-way directional control valve, and wherein, the A mouth of described left and right proportional reversing valve, B mouth are connected with the rod chamber or the rodless cavity of described left and right support oil cylinder respectively.
7. as each described milling machine support lifting device of claim 1-6, it is characterized in that described left and right proportional reversing valve is electric proportional reversing valve.
8. milling machine support lifting device as claimed in claim 7 is characterized in that, also comprises left and right electron-amplifier, is connected with the coil of described left and right proportional reversing valve respectively, is used to amplify the control signal of telecommunication of described left and right proportional reversing valve.
9. a pavement milling machine is characterized in that, comprises each described milling machine support lifting device as claim 1-6.
10. pavement milling machine as claimed in claim 9 is characterized in that, described left and right proportional reversing valve is electric proportional reversing valve; Also comprise left and right electron-amplifier, be connected with the coil of described left and right proportional reversing valve respectively, be used to amplify the control signal of telecommunication of described left and right proportional reversing valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101745228A CN101397770B (en) | 2005-08-09 | 2005-08-09 | Milling machine outrigger elevator apparatus and pavement milling machine using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101745228A CN101397770B (en) | 2005-08-09 | 2005-08-09 | Milling machine outrigger elevator apparatus and pavement milling machine using the same |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2005800266377A Division CN101006371B (en) | 2004-08-10 | 2005-08-09 | Single-mode optical fiber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101397770A CN101397770A (en) | 2009-04-01 |
| CN101397770B true CN101397770B (en) | 2011-08-31 |
Family
ID=40516594
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101745228A Active CN101397770B (en) | 2005-08-09 | 2005-08-09 | Milling machine outrigger elevator apparatus and pavement milling machine using the same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101397770B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103884586A (en) * | 2014-03-24 | 2014-06-25 | 上海交通大学 | Electro-hydraulic loading system of film biaxial tensile testing machine |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8469456B2 (en) | 2009-03-25 | 2013-06-25 | Wirtgen Gmbh | Ejector unit for a road milling machine or the like |
| DE102009014729B3 (en) * | 2009-03-25 | 2010-11-04 | Wirtgen Gmbh | Ejector for a road milling machine or the like |
| CN101975202B (en) * | 2010-10-15 | 2013-07-24 | 马鞍山钢铁股份有限公司 | Control method of hydraulic cylinder synchronous control system |
| DE102010054430B4 (en) * | 2010-12-14 | 2015-10-01 | Marco Systemanalyse Und Entwicklung Gmbh | Mobile machine |
| CN102644232B (en) * | 2012-05-09 | 2014-12-10 | 中联重科股份有限公司 | Control method and control device of milling machine and milling machine |
| CN102913493A (en) * | 2012-09-06 | 2013-02-06 | 浙江大学 | Hydraulic system capable of independently adjusting speed by adopting two pressure compensators |
| CN102880145B (en) * | 2012-09-28 | 2016-02-03 | 三一汽车制造有限公司 | leg control system and engineering machinery |
| CN103086289B (en) * | 2013-02-05 | 2015-06-17 | 中联重科股份有限公司 | Support oil cylinder extension speed control method, and device, system and crane thereof |
| CN107178024B (en) * | 2016-04-06 | 2023-01-17 | 江苏徐工工程机械研究院有限公司 | Landing leg lifting control system and method and engineering machinery |
| CN109083892A (en) * | 2018-10-17 | 2018-12-25 | 北京天顺长城液压科技有限公司 | Electrofluidic control device for milling machine supporting leg |
| CN111328488A (en) * | 2020-04-13 | 2020-06-26 | 中联重机股份有限公司 | Crawler harvester with differential steering |
| CN114477020A (en) * | 2021-12-23 | 2022-05-13 | 三江瓦力特特种车辆有限公司 | Hydraulic lifting control circuit with protection function |
-
2005
- 2005-08-09 CN CN2008101745228A patent/CN101397770B/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103884586A (en) * | 2014-03-24 | 2014-06-25 | 上海交通大学 | Electro-hydraulic loading system of film biaxial tensile testing machine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101397770A (en) | 2009-04-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101397770B (en) | Milling machine outrigger elevator apparatus and pavement milling machine using the same | |
| CN106438591B (en) | The high-precision propulsion hydraulic system of balancing earth-pressure shielding machine ratio control and control method | |
| CN201739246U (en) | Mechanical locking type double-cylinder synchronous erecting support hydraulic circuit | |
| CN101318538B (en) | Hydraulic control system and apparatus for split positioning of ship body | |
| CN102912778B (en) | Locking device and hydraulic control system thereof | |
| CN106351134B (en) | Existing line box culvert is worn under one kind and synchronizes jacking system and jacking method | |
| CN202381427U (en) | Hydraulic oil cylinder synchronization control loop and crane using same | |
| CN103982475B (en) | A kind of concrete ejection car jib hydraulic control system | |
| CN103708376B (en) | Large-scale deck plate Large travel range synchronization of jacking up control structure | |
| CN104632736A (en) | Two-degree-of-freedom rocking platform and hydraulic system thereof | |
| CN105201951B (en) | The controlled TBM support hydraulic pressure system of high-efficiency high-accuracy flow | |
| CN103398039B (en) | A kind of control valve device, multi-cylinder synchronous hydraulic control system and hoist | |
| CN101230584A (en) | Laser-control flattening bulldozer | |
| CN107815975A (en) | Incremental launching construction by multipoint jacking device and construction method of the multi-joint multi-span steel beam based on independent non-rigid bridge pier | |
| CN206173822U (en) | Under wear existing circuit box and contain synchronous top and enter system | |
| CN102808433B (en) | Hydraulic circuit and method for controlling compound actions of excavator movable arm | |
| CN104594165A (en) | Leveling system, paver and leveling method | |
| CN103047206A (en) | Fast synchronization hydraulic system for segment assembling lifting motion | |
| CN205876836U (en) | Synchronous hydraulic system and hoist | |
| CN106015138A (en) | Synchronous hydraulic system and crane | |
| CN113819097B (en) | Control valve group, hydraulic system, engineering machinery and arm support overturning control method of engineering machinery | |
| CN102587445A (en) | Load sensing flow control hydraulic system with energy regeneration and conservation | |
| CN104179460A (en) | Tower lifting device of roller-bit hole rig | |
| CN108316096B (en) | Integrated control hydraulic system of road paver and control method thereof | |
| CN104309161A (en) | Multi-cylinder piecewise pressure regulation system for hydraulic press |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CI01 | Correction of invention patent gazette |
Correction item: Application date, case information Correct: 20081105, cancel the case False: 20050809,2005800266377 Number: 13 Volume: 25 |
|
| CI02 | Correction of invention patent application |
Correction item: Application date and case information Correct: 20081105, cancel the case False: 20050809 Number: 13 Page: The title page Volume: 25 |
|
| ERR | Gazette correction |
Free format text: CORRECT: APPLICATION DATE, DIVISION INFORMATION; FROM: 20050809,2005800266377 TO: 20081105, CANCEL DIVISION |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20151116 Address after: 413000 Yiyang high tech Zone in the eastern part of the New District of integrated services building, Room 502, Hunan Patentee after: Yiyang science and Technology Achievement Transformation Service Center Patentee after: Sanyi Heavy Industry Co., Ltd. Address before: 410100 Changsha economic and Technological Development Zone, Hunan City, the 31 industrial city Patentee before: Sanyi Heavy Industry Co., Ltd. |