CN202451484U - Double-cylinder synchronization control hydraulic system and crane - Google Patents
Double-cylinder synchronization control hydraulic system and crane Download PDFInfo
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- CN202451484U CN202451484U CN2012200688304U CN201220068830U CN202451484U CN 202451484 U CN202451484 U CN 202451484U CN 2012200688304 U CN2012200688304 U CN 2012200688304U CN 201220068830 U CN201220068830 U CN 201220068830U CN 202451484 U CN202451484 U CN 202451484U
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Abstract
The utility model discloses a double-cylinder synchronization control hydraulic system which comprises a first oil cylinder, a second oil cylinder, a synchronization element and a double-cylinder synchronization independent control device, wherein the device is provided with a first oil inlet, a second oil inlet, a first oil outlet, a second oil outlet, an oil discharge port, a first hydraulic control check valve, a second hydraulic control check valve, a first reversing valve, a second reversing valve, a first check valve and a second check valve; the first oil inlet is communicated with the first oil outlet; and the second oil inlet is communicated with the second oil outlet. The two hydraulic oil cylinders of the system are relatively high in synchronization precision and can be independently controlled through operation, so that the synchronization error can be manually eliminated. The utility model also discloses a crane with the double-cylinder synchronization control hydraulic system.
Description
Technical field
The utility model relates to technical field of hydraulic, particularly the twin-tub synchronization control hydraulic system of hoist.The utility model also relates to the hoist that is provided with said twin-tub synchronization control hydraulic system.
Background technique
Along with the continuous increase of hoister in large tonnage lifting tonnage, counterweight weight that it is set and quantity also constantly increase, so the device of lifting counterweight is also with regard to the natural selection double hydraulic cylinder.
The use of double hydraulic cylinder can promote the weight of counterweight, and can guarantee stationarity.But twin-tub is operated simultaneously and can be had a serious problem, and promptly twin-tub is done synchronization onwards or when falling to operating simultaneously; There is certain synchronization error; The existence of this error is very serious to oil hydraulic cylinder influence, gently then causes oil hydraulic cylinder cylinder barrel and piston rod to be out of shape, and is heavy then can cause serious security incident.
At present; Employed twin-tub synchro system all adopts synchronization control element flow divider-combiner on the hoist; Guarantee the synchronism of twin-tub with this, promptly whole double-cylinder hydraulic synchro system only depends on the synchronizing characteristics of this valve to guarantee the synchronous of twin-tub, has following technical disadvantages:
1) this method can adapt to less demanding occasion synchronously, but for hoister in large tonnage, because counterweight weight super large, it is more important that the synchronism of twin-tub just seems, independent flow divider-combiner can not be satisfied with requirement of system design.
2) the synchronism error of counterweight oil cylinder depends primarily on the shunting precision of flow divider-combiner, in case flow divider-combiner is selected, synchro system can't be eliminated synchronization error twin-tub occurring when asynchronous, and this promotes to twin-tub and has brought great difficulty.
Therefore, how improving the net synchronization capability of hoist twin-tub synchronization hydraulic system, is the present technical issues that need to address of those skilled in the art.
The model utility content
First purpose of the utility model provides a kind of twin-tub synchronization control hydraulic system.The biliquid compressing cylinder of this system not only has the higher synchronous precision, can also carry out independent control to single cylinder through operation, thereby manually eliminate synchronization error.
Second purpose of the utility model provides a kind of hoist that is provided with said twin-tub synchronization control hydraulic system.
In order to realize above-mentioned first purpose; The utility model provides a kind of twin-tub synchronization control hydraulic system; Comprise first oil cylinder, second oil cylinder and synchronous element; Further comprise the synchronous independent control gear of twin-tub, this device has first filler opening, second filler opening, first oil outlet, second oil outlet and drain tap, and is provided with first Pilot operated check valve, second Pilot operated check valve, first selector valve, second selector valve, first one-way valve and second one-way valve; Said first filler opening is communicated with said first oil outlet, and said second filler opening is communicated with said second oil outlet;
The filler opening of said first Pilot operated check valve is communicated with said drain tap, oil outlet is communicated with said first filler opening; Its guide's hydraulic fluid port selectively is communicated with the oil outlet or the said drain tap of said second one-way valve through said first selector valve, and the filler opening of said second one-way valve is communicated with said second oil outlet;
The filler opening of said second Pilot operated check valve is communicated with said drain tap, oil outlet is communicated with said second filler opening; Its guide's hydraulic fluid port selectively is communicated with the oil outlet or the said drain tap of said first one-way valve through said second selector valve, and the filler opening of said first one-way valve is communicated with said first oil outlet;
First oil outlet of said synchronous element and second oil outlet are communicated with first filler opening and second filler opening of the synchronous independent control gear of said twin-tub respectively, and first oil outlet of the synchronous independent control gear of said twin-tub and second oil outlet are communicated with the filler opening of said first oil cylinder and second oil cylinder respectively.
Preferably; Said first selector valve and second selector valve all have first hydraulic fluid port, second hydraulic fluid port and the 3rd hydraulic fluid port, and have two working positions: in first working position, its first hydraulic fluid port is communicated with second hydraulic fluid port; In second working position, its second hydraulic fluid port is communicated with the 3rd hydraulic fluid port;
First hydraulic fluid port of said first selector valve, second hydraulic fluid port and the 3rd hydraulic fluid port are communicated with the oil outlet of second one-way valve, the guide's hydraulic fluid port and the drain tap of first Pilot operated check valve respectively;
First hydraulic fluid port of said second selector valve, second hydraulic fluid port and the 3rd hydraulic fluid port are communicated with the oil outlet of first one-way valve, the guide's hydraulic fluid port and the drain tap of second Pilot operated check valve respectively.
Preferably, said first selector valve and second selector valve are the two-position three way solenoid directional control valve.
Preferably, further comprise relief valve, the filler opening of said relief valve is communicated with the oil outlet of said first one-way valve and second one-way valve, and the oil outlet of said relief valve is communicated with said drain tap.
Preferably, said synchronous element is a syncmotor.
Preferably, said syncmotor is the plunger type syncmotor.
Preferably, the filler opening oil circuit of said synchronous element is provided with one-way throttle valve.
Preferably, the filler opening oil circuit of said synchronous element is provided with series flow control valve.
For realizing above-mentioned second purpose, the utility model provides a kind of hoist, comprises hoist body and twin-tub synchronization control hydraulic system, and said twin-tub synchronization control hydraulic system is above-mentioned each described twin-tub synchronization control hydraulic system.
Preferably, said first oil cylinder and second oil cylinder are the amplitude oil cylinder or the counterweight oil cylinder of hoist.
The twin-tub synchronization control hydraulic system that the utility model provided is through synchronous element and the synchronous independent control gear of twin-tub etc.; Realize that twin-tub hoists and the synchronization control when falling to operating; When realizing, also can carry out independent control to its first oil outlet and second oil outlet through first selector valve and second selector valve of operation Hydraulic Synchronizing independence control gear to twin-tub control; The synchronization error during thereby the elimination twin-tub is synchronized with the movement has effectively promoted the synchronization accuracy that twin-tub moves simultaneously.
In a kind of embodiment, further comprise relief valve, the filler opening of said relief valve is communicated with the oil outlet of said first one-way valve and second one-way valve, oil outlet is communicated with said drain tap.Through relief valve is set, when system pressure raises, can avoid system to build the pressure sealing, component life are produced harmful effect, thereby guarantees security of system.And make this control gear be applicable to syncmotor, thereby obtain versatility more widely.
In another kind of embodiment, said synchronous element is a syncmotor.The synchronization accuracy of common syncmotor is about 1.5%-2.5%, and the precision of plunger type syncmotor then can reach 0.5%, compares with flow divider-combiner, can significantly promote the synchronization accuracy of hydraulic system, and easy and simple to handle.
The hoist that the utility model provided is provided with above-mentioned twin-tub synchronization control hydraulic system, because above-mentioned twin-tub synchronization control hydraulic system has above-mentioned technique effect, the hoist that is provided with this twin-tub synchronization control hydraulic system also should possess the corresponding techniques effect.
Description of drawings
Fig. 1 provides the hydraulic schematic diagram of a kind of embodiment of twin-tub synchronization control hydraulic system for the utility model;
Fig. 2 is the hydraulic schematic diagram of the synchronous independent control gear of twin-tub shown in Fig. 1.
Among the figure:
1. synchronous independent control gear 7. first equilibrium valves 8. second equilibrium valves 9. first oil cylinders 10. second oil cylinders 11. first Pilot operated check valves 12. second Pilot operated check valves 13. first selector valves 14. second selector valves 15. first one-way valves 16. second one-way valves 17. relief valves of oil hydraulic pump 2. relief valves 3. main valves 4. one-way throttle valves 5. syncmotors 6. twin-tubs
Embodiment
The core of the utility model provides a kind of twin-tub synchronization control hydraulic system.The biliquid compressing cylinder of this system not only has the higher synchronous precision, can also carry out independent control to single cylinder through operation, thereby manually eliminate synchronization error.
Another core of the utility model provides a kind of hoist that is provided with said twin-tub synchronization control hydraulic system.
In order to make those skilled in the art person understand the utility model scheme better, the utility model is done further to specify below in conjunction with accompanying drawing and embodiment.
Please refer to Fig. 1, Fig. 1 provides the hydraulic schematic diagram of a kind of embodiment of twin-tub synchronization control hydraulic system for the utility model.
In a kind of embodiment, the twin-tub synchronization control hydraulic system that the utility model provides mainly is made up of oil hydraulic pump 1, main valve 3, syncmotor 5, the synchronous independent control gear 6 of twin-tub and two oil cylinder.
Oil circuit between oil hydraulic pump 1 oil outlet and the fuel tank is provided with relief valve 2; The oil-feed oil circuit of syncmotor 5 is provided with one-way throttle valve 4; Be respectively equipped with first equilibrium valve 7 and second equilibrium valve 8 on the oil-feed oil circuit of first oil cylinder 9 and second oil cylinder 10, first oil outlet of syncmotor 5 and second oil outlet are communicated with first equilibrium valve 7 and second equilibrium valve 8 respectively through the synchronous independent control gear 6 of twin-tub.
Syncmotor 5 is devices that a kind of two motor coaxial rigid connect; Therefore the rotating speed of its each motor can be consistent; Only need can change through the displacement size that changes two motors the split ratio of syncmotor, for example the discharge capacity of two motors is selected to equate that then split ratio will be 1: 1.
The streaming error of syncmotor 5 mainly is present in two motors leakage and foozle separately.In general, the synchronization accuracy of common syncmotor is about 1.5%-2.5%, and the precision of plunger type syncmotor then can reach 0.5%, compares with flow divider-combiner, can farthest promote the synchronization accuracy of hydraulic system, and easy and simple to handle.
Because there is certain streaming error in syncmotor 5, when streaming error surpasses certain value, may cause the twin-tub motion to be obstructed, influence Security, so need set up the synchronous independent control gear of twin-tub.This device can be realized the independent compensation of streaming error, can eliminate the synchronization error of twin-tub in being synchronized with the movement.
Please refer to Fig. 2, Fig. 2 is the hydraulic schematic diagram of the synchronous independent control gear of twin-tub shown in Fig. 1.
The synchronous independent control gear 6 of twin-tub has the first filler opening A1, the second filler opening A2, the first oil outlet B1, the second oil outlet B2 and drain tap T, and is integrated with first Pilot operated check valve 11, second Pilot operated check valve 12, first selector valve 13, second selector valve 14, first one-way valve 15 and second one-way valve 16.
First hydraulic fluid port of first selector valve 13, second hydraulic fluid port and the 3rd hydraulic fluid port are communicated with the oil outlet of second one-way valve 16, the guide's hydraulic fluid port and the drain tap T of first Pilot operated check valve 11 respectively, and the filler opening of second one-way valve 16 is communicated with the second oil outlet B2.
First hydraulic fluid port of second selector valve 14, second hydraulic fluid port and the 3rd hydraulic fluid port are communicated with the oil outlet of first one-way valve 15, the guide's hydraulic fluid port and the drain tap T of second Pilot operated check valve 12 respectively, and the filler opening of first one-way valve 15 is communicated with the first oil outlet B1.
The first filler opening A1 is communicated with the first oil outlet B1; The second filler opening A2 is communicated with the second oil outlet B2; The filler opening of first Pilot operated check valve 11 is communicated with drain tap T, oil outlet is communicated with the first filler opening A1, and the filler opening of second Pilot operated check valve 12 is communicated with drain tap T, oil outlet is communicated with the second filler opening A2.
When first selector valve 13 is in first working position; And when second selector valve 14 was in second working position, first Pilot operated check valve 11 was opened, and the first filler opening A1 is communicated with drain tap T; No longer to the first oil outlet B1 normal fuel injection, and the second filler opening A2 is still to the second oil outlet B2 fuel feeding.
When first selector valve 13 is in second working position; And when second selector valve 14 was in first working position, second Pilot operated check valve 12 was opened, and the second filler opening A2 is communicated with drain tap T; No longer to the second oil outlet B2 normal fuel injection, and the first filler opening A1 is still to the first oil outlet B1 fuel feeding.
That is to say,, can carry out independent control to the first oil outlet B1 and the second oil outlet B2 when needed through first selector valve 13 and second selector valve 14.Because when independent control, its first filler opening A1 or the second filler opening A2 are communicated with drain tap T, so can avoid system's overflow that builds the pressure.
In addition, the filler opening of its first Pilot operated check valve 11 and second Pilot operated check valve 12 directly is communicated with fuel tank through drain tap T, when synchronization hydraulic system occurs inhaling sky, can carry out repairing well, makes system works more stable.
For improving the Security of system, can further set up relief valve 17, the filler opening of relief valve 17 is communicated with the oil outlet of first one-way valve 15 and second one-way valve 16, and the oil outlet of relief valve 17 is communicated with drain tap T.
Through relief valve 17 is set, when system pressure raises, can avoid system to build the pressure sealing, component life are produced harmful effect, thereby guarantees security of system.And make this control gear not only go for the synchro system of flow divider-combiner control, but also can be used for the synchro system of syncmotor control, make it have versatility more widely.
Please continue with reference to figure 1; First oil outlet of syncmotor and second oil outlet are communicated with the first filler opening A1 and the second filler opening A2 of the synchronous independent control gear of twin-tub respectively; The first oil outlet B1 of the synchronous independent control gear of twin-tub and the second oil outlet B2 are communicated with the filler opening of first equilibrium valve and second equilibrium valve respectively, and drain tap T is communicated with fuel tank.
Through the unlatching of control two-position three way solenoid directional control valve control Pilot operated check valve, then the hydraulic oil of the syncmotor of this side discharge will be through the Pilot operated check valve oil sump tank, and promptly the oil hydraulic cylinder of this side will stop action; The hydraulic oil that the opposite side syncmotor is discharged will promote oil hydraulic cylinder and move.When the position of twin-tub equates, then can carry out simultaneously operating, promptly twin-tub moves simultaneously.
The utility model provides the working principle of twin-tub synchronization control hydraulic system following:
One, the twin-tub operating mode that hoists synchronously
Control main valve 3 right-hand members get; After the hydraulic oil of oil hydraulic pump 1 output passes through; Arrive the filler opening of syncmotor 5 through the one-way valve in the one-way throttle valve 4, thereby promote syncmotor 5 rotations, syncmotor 5 is exported hydraulic oil in proportion; Two oil circuit hydraulic oil get into the rodless cavity of first oil cylinder 9 and second oil cylinder 10 respectively, stretch out thereby promote two hydraulic cylinder synchronous.
Two, the twin-tub operating mode that falls synchronously
Control main valve 3 left ends get; After the hydraulic oil of oil hydraulic pump 1 output passes through; Get into the rod chamber of first oil cylinder 9 and second oil cylinder 10, pressure oil promotes the twin-tub retraction, and the oil return of rodless cavity compiles and one-way throttle valve 4 places after through the synchronous independent control gear of first equilibrium valve 7 and second equilibrium valve 8, twin-tub 6, syncmotor 5; Through the T mouth of the restriction in the one-way throttle valve 4, thereby realize that oil return is to fuel tank to main valve 3.
Three, the single cylinder operating mode that independently hoists
Hoist or fall when asynchronous when twin-tub occurring, just need the independent control operation of starting.Be controlled to be example separately with first oil cylinder 9 below, set forth the oil hydraulic cylinder realization principle of control separately.
Control main valve 3 right-hand members get electric after; Pressure gets into first oil cylinder 9 through one-way throttle valve 4, syncmotor 5, synchronizer 6 backs, and this moment is too fast if first oil cylinder, 9 lifting velocities occur, and second oil cylinder, 10 lifting velocities are slow excessively; And the positional error of twin-tub has surpassed normal allowed band; Then can start independent control operation, its objective is to make 9 stop motions of first oil cylinder, only allow second oil cylinder 10 to play lift operations.
May command first selector valve 13; Then hydraulic oil is through guide's oil pocket of first one-way valve 15, first selector valve, 13 upper entering first Pilot operated check valves 11; First Pilot operated check valve 11 can be opened in the effect of pressure; Thereby the hydraulic oil that makes syncmotor 5 first oil outlets output is from drain tap T oil sump tank, do not have pressure to get into the rodless cavity of first oil cylinder 9, so first oil cylinder 9 can not move; And syncmotor 5 second oil outlets can normally be exported high-pressure and hydraulic oil, and pressure oil gets into the rodless cavity of second oil cylinder 10, promote second oil cylinder 10 and promote.When second oil cylinder 10 is promoted to the position of first oil cylinder 9, then can stop independent operation, i.e. main valve 3 right-hand member dead electricity, then twin-tub recovery synchronization motion.
Above-mentioned twin-tub synchronization control hydraulic system only is a kind of preferred version of the utility model, specifically is not limited thereto, and can make pointed adjustment according to actual needs on this basis, thereby obtain different embodiment.For example, when syncmotor replaces with flow divider-combiner, still can accomplish being synchronized with the movement, controlling separately function; When one-way throttle valve becomes series flow control valve, also can realize identical function.Because mode in the cards is more, just illustrate no longer one by one here.
Except above-mentioned twin-tub synchronization control hydraulic system, the utility model also provides a kind of hoist, comprises hoist body and twin-tub synchronization control hydraulic system, and said twin-tub synchronization control hydraulic system is a twin-tub synchronization control hydraulic system mentioned above.
Particularly, said first oil cylinder and second oil cylinder are the amplitude oil cylinder or the counterweight oil cylinder of hoist.
More than twin-tub synchronization control hydraulic system and hoist that the utility model provided have been carried out detailed introduction.Used concrete example among this paper the principle and the mode of execution of the utility model are set forth, above embodiment's explanation just is used to help to understand the core concept of the utility model.Should be understood that; For those skilled in the art; Under the prerequisite that does not break away from the utility model principle, can also carry out some improvement and modification to the utility model, these improvement and modification also fall in the protection domain of the utility model claim.
Claims (10)
1. twin-tub synchronization control hydraulic system; Comprise first oil cylinder, second oil cylinder and synchronous element; It is characterized in that; Further comprise the synchronous independent control gear of twin-tub, this device has first filler opening, second filler opening, first oil outlet, second oil outlet and drain tap, and is provided with first Pilot operated check valve, second Pilot operated check valve, first selector valve, second selector valve, first one-way valve and second one-way valve; Said first filler opening is communicated with said first oil outlet, and said second filler opening is communicated with said second oil outlet;
The filler opening of said first Pilot operated check valve is communicated with said drain tap, oil outlet is communicated with said first filler opening; Its guide's hydraulic fluid port selectively is communicated with the oil outlet or the said drain tap of said second one-way valve through said first selector valve, and the filler opening of said second one-way valve is communicated with said second oil outlet;
The filler opening of said second Pilot operated check valve is communicated with said drain tap, oil outlet is communicated with said second filler opening; Its guide's hydraulic fluid port selectively is communicated with the oil outlet or the said drain tap of said first one-way valve through said second selector valve, and the filler opening of said first one-way valve is communicated with said first oil outlet;
First oil outlet of said synchronous element and second oil outlet are communicated with first filler opening and second filler opening of the synchronous independent control gear of said twin-tub respectively, and first oil outlet of the synchronous independent control gear of said twin-tub and second oil outlet are communicated with the filler opening of said first oil cylinder and second oil cylinder respectively.
2. twin-tub synchronization control hydraulic system according to claim 1; It is characterized in that; Said first selector valve and second selector valve all have first hydraulic fluid port, second hydraulic fluid port and the 3rd hydraulic fluid port, and have two working positions: in first working position, its first hydraulic fluid port is communicated with second hydraulic fluid port; In second working position, its second hydraulic fluid port is communicated with the 3rd hydraulic fluid port;
First hydraulic fluid port of said first selector valve, second hydraulic fluid port and the 3rd hydraulic fluid port are communicated with the oil outlet of second one-way valve, the guide's hydraulic fluid port and the drain tap of first Pilot operated check valve respectively;
First hydraulic fluid port of said second selector valve, second hydraulic fluid port and the 3rd hydraulic fluid port are communicated with the oil outlet of first one-way valve, the guide's hydraulic fluid port and the drain tap of second Pilot operated check valve respectively.
3. twin-tub synchronization control hydraulic system according to claim 2 is characterized in that said first selector valve and second selector valve are the two-position three way solenoid directional control valve.
4. according to each described twin-tub synchronization control hydraulic system of claim 1 to 3; It is characterized in that; Further comprise relief valve, the filler opening of said relief valve is communicated with the oil outlet of said first one-way valve and second one-way valve, and the oil outlet of said relief valve is communicated with said drain tap.
5. according to each described twin-tub synchronization control hydraulic system of claim 1 to 3, it is characterized in that said synchronous element is a syncmotor.
6. twin-tub synchronization control hydraulic system according to claim 5 is characterized in that said syncmotor is the plunger type syncmotor.
7. according to each described twin-tub synchronization control hydraulic system of claim 1 to 3, it is characterized in that the filler opening oil circuit of said synchronous element is provided with one-way throttle valve.
8. according to each described twin-tub synchronization control hydraulic system of claim 1 to 3, it is characterized in that the filler opening oil circuit of said synchronous element is provided with series flow control valve.
9. a hoist comprises hoist body and twin-tub synchronization control hydraulic system, it is characterized in that, said twin-tub synchronization control hydraulic system is aforesaid right requirement 1 to 8 each described twin-tub synchronization control hydraulic system.
10. hoist according to claim 9 is characterized in that, said first oil cylinder and second oil cylinder are the amplitude oil cylinder or the counterweight oil cylinder of hoist.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200688304U CN202451484U (en) | 2012-02-28 | 2012-02-28 | Double-cylinder synchronization control hydraulic system and crane |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200688304U CN202451484U (en) | 2012-02-28 | 2012-02-28 | Double-cylinder synchronization control hydraulic system and crane |
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| CN202451484U true CN202451484U (en) | 2012-09-26 |
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| CN2012200688304U Expired - Lifetime CN202451484U (en) | 2012-02-28 | 2012-02-28 | Double-cylinder synchronization control hydraulic system and crane |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102536934A (en) * | 2012-02-28 | 2012-07-04 | 徐州重型机械有限公司 | Dual-cylinder synchronous control hydraulic system and crane |
| CN103482372A (en) * | 2013-09-24 | 2014-01-01 | 长春发电设备总厂 | Hydraulic semi-luffing tripper car of head-sinking-preventing bucket-wheel stacker-reclaimer |
| CN104235092A (en) * | 2014-09-18 | 2014-12-24 | 芜湖高昌液压机电技术有限公司 | Unilateral throttling synchronism loop of dual-column gantry lifting machine |
| CN104405705A (en) * | 2014-09-18 | 2015-03-11 | 芜湖高昌液压机电技术有限公司 | Automatic correction hydraulic motor synchronizing circuit of two-column gantry lifting machine |
| CN105483870A (en) * | 2016-01-26 | 2016-04-13 | 湖州南浔中兴丝织有限公司 | Silk winding mechanical part of silk winding and strip forming production device |
| CN106698199A (en) * | 2017-01-23 | 2017-05-24 | 武汉船用机械有限责任公司 | Double-derricking cylinder hydraulic control system |
-
2012
- 2012-02-28 CN CN2012200688304U patent/CN202451484U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102536934A (en) * | 2012-02-28 | 2012-07-04 | 徐州重型机械有限公司 | Dual-cylinder synchronous control hydraulic system and crane |
| CN103482372A (en) * | 2013-09-24 | 2014-01-01 | 长春发电设备总厂 | Hydraulic semi-luffing tripper car of head-sinking-preventing bucket-wheel stacker-reclaimer |
| CN104235092A (en) * | 2014-09-18 | 2014-12-24 | 芜湖高昌液压机电技术有限公司 | Unilateral throttling synchronism loop of dual-column gantry lifting machine |
| CN104405705A (en) * | 2014-09-18 | 2015-03-11 | 芜湖高昌液压机电技术有限公司 | Automatic correction hydraulic motor synchronizing circuit of two-column gantry lifting machine |
| CN105483870A (en) * | 2016-01-26 | 2016-04-13 | 湖州南浔中兴丝织有限公司 | Silk winding mechanical part of silk winding and strip forming production device |
| CN106698199A (en) * | 2017-01-23 | 2017-05-24 | 武汉船用机械有限责任公司 | Double-derricking cylinder hydraulic control system |
| CN106698199B (en) * | 2017-01-23 | 2018-08-07 | 武汉船用机械有限责任公司 | A kind of double amplitude oil cylinder hydraulic control systems |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120926 |
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| CX01 | Expiry of patent term |