CN101521470A - Power supply method and power supply system for rubber-tyred container gantry crane - Google Patents
Power supply method and power supply system for rubber-tyred container gantry crane Download PDFInfo
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- CN101521470A CN101521470A CN200910048278A CN200910048278A CN101521470A CN 101521470 A CN101521470 A CN 101521470A CN 200910048278 A CN200910048278 A CN 200910048278A CN 200910048278 A CN200910048278 A CN 200910048278A CN 101521470 A CN101521470 A CN 101521470A
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Abstract
The invention provides a power supply method and a power supply system for a rubber-tyred container gantry crane. The technical proposal comprises: taking a diesel generating set as an electric energy supply device to provide the system with low-power electric energy, and taking an energy storage unit as an electric energy supply system of the whole machine to provide short-time high-power energy demand for a hoisting mechanism by a method of energy accumulation by time so as to remarkably reduce the equipment power of a diesel engine. Compared with the prior power supply proposal of the rubber-tyred container gantry crane, the technical proposal of the invention saves more than 60 percent of fuel oil. The power supply method and the power supply system for the rubber-tyred container gantry crane have the advantages of greatly reducing the oil consumption of the rubber-tyred container gantry crane, improving the utilization rate of the fuel oil, and achieving the aims of energy conservation and emission reduction, and maintain the maneuvering flexibility possessed by the rubber-tyred container gantry crane.
Description
Technical field
The present invention relates to the harbour hoisting equipment, more particularly, relate to a kind of rubbertyred container gantry crane method of supplying power to and system.
Background technology
Rubbertyred container gantry crane (abbreviation tyre crane) is the present main pile machinery in container terminal in the world, and the total outfit amount in the whole world surpasses 6500 at present, accounts for mechanical more than 90% of total amount of all kinds of piles.The outfit amount of China is above 2000.Rubbertyred container gantry crane is to obtain operation power by the diesel generating set burning diesel oil that disposes on its machine.
As shown in Figure 1, the power supply plan of traditional rubbertyred container gantry crane is that the electricity that diesel generating set 101 sends passes through circuit breaker 102,103,104 supply with described crane with electricity, part electricity is given other auxiliary equipment 106 power supplies of rubbertyred container gantry crane by transformer 105, the other part of the electricity that sends is transferred to the work drive motor of described rubbertyred container gantry crane by inverter 107 and corresponding frequency converter, concrete is, and the frequency converter 108 that hoists is lifting motor 181 power supplies, the dolly frequency converter 109 of crane and cart frequency converter 110,111 is corresponding motor power supply, when descending, the suspender of rubbertyred container gantry crane can make lifting motor 181 produce electric energy, but this part regenerative electric energy is not effectively utilized, and is converted to heat energy by the resistance of relevant device and consumes (consuming such as being braked unit 112 and brake resistance 113).Because on job specification and the power configuration, the fuel utilization ratio of the power supply plan of traditional rubbertyred container gantry crane only be 8%---13%, it exists, and noise is big, discharge amount of exhaust gas greatly, maintenance cost and all very high shortcoming of operating cost.
At the high problem of rubbertyred container gantry crane oil consumption, some fuel-saving technique schemes have appearred in the market.As: super capacitor energy-storage, flywheel energy storage and press power demand and regulate diesel engine speed etc.It is reported that the oil-saving effect of these schemes is between 20%---40%.
As shown in Figure 2, the alternating current that diesel generating set 201 sends is handled through inverter 202, and be that motor 204 is powered through frequency converter 203, increases a super capacitor 205 and is directly parallel on the DC master row.This power supply plan can descend energy consumption more than 11～13%.But, the diesel generating set of this power supply plan configuration is with the diesel generating set equally big (440-480KW) of conventional tire formula gantry container crane machine, because the upper and lower bound of DC master row voltage has requirement, so the utilizable charge/discharge capacity scope of super capacitor is very restricted.
Again as shown in Figure 3, diesel generating set 301 is 280KW, and super capacitor 305 is parallel on the DC master row by DC/DC converter 306.
Above-mentioned two kinds of power supply plans all are based on diesel generating set, are as energy recuperation and auxiliary power unit super capacitor.
Afterwards, also occurred rubbertyred container gantry crane on the market and become oil firing into using " oil changes " scheme of machine on the grid alternating current of ground.It is reported, the energy-saving effect ably done of rubbertyred container gantry crane " oil changes " scheme also be about 40%, initial outlay is big, the transition operation is wasted time and energy, and has sacrificed motor-driven, flexible characteristic that rubbertyred container gantry crane possessed originally but " oil changes " brought again.
By analysis, cause the big main cause of rubbertyred container gantry crane fuel consume to have:
1, the diesel engine power configuration is excessive
Hoisting and the peak power needs of two mechanisms of dolly during in order to satisfy rubbertyred container gantry crane all with peak load, normal speed and rated acceleration operation, 440---480KW high-power diesel generating set is generally all selected by producer, and the continuous power during the common operation of rubbertyred container gantry crane is only about 80KW.
2, diesel engine low load time ratio is too high
According to statistics: diesel load is lower than and reaches more than 85% duration of runs of 25%, still operation at full speed of diesel engine during this period, and a large amount of reserve capacities causes the fuel oil waste serious.
3, unloaded waiting time is long
Because the decision of dock operation character, unloaded waiting time is generally 50%---65%.But because the needs of communication, illumination, air conditioner, diesel engine still needs full speed running, the empty diesel oil that burns.
4, the electric energy that weight descends and mechanism's moderating process produces does not obtain utilizing
The regenerative electric energy that produces in weight decline and the mechanism's moderating process is braked resistance and has consumed in vain, can't obtain recycling.
Summary of the invention
Defectives such as oil consumption height, pollution weight and complex structure thereof at present rubbertyred container gantry crane existence, the purpose of this invention is to provide a kind of rubbertyred container gantry crane method of supplying power to and system, this system and method not only can reduce the oil consumption of rubbertyred container gantry crane significantly, improve the utilance of fuel oil, reach the energy-saving and emission-reduction purpose, and can guarantee the maneuverability of rubbertyred container gantry crane.
For this reason, rubbertyred container gantry crane method of supplying power to of the present invention, it comprises the steps:
A, diesel generating set carry out the small-power generating at ordinary times;
B, the electric energy that generates is charged to Storage Unit after the AC/DC conversion;
C, the electric energy that stores is supplied with each high-power travelling mechanism of rubbertyred container gantry crane in short-term through the DC/DC conversion.
Among the described step b, the electric energy of described generation is collected by Storage Unit under the intelligent power management module controls after the AC/DC conversion, and the intelligent power management module is also controlled the speed regulator work of diesel generating set.
Described intelligent power management module have following each or appoint several functions:
A, with the fluctuation direct current be transformed into constant DC, export to Storage Unit;
B, few in energy storage, the Storage Unit initial condition that internal resistance is very low is carried out the current limliting management during to Storage Unit precharge;
C, Storage Unit energy storage are lower than when setting threshold values, stop each mechanism action of rubbertyred container gantry crane, and the wait charging process is carried out;
When d, diesel generating set work, keep the Storage Unit normality is charged;
When e, Storage Unit energy storage quota, the control diesel generating set turn-offs;
F, when the Storage Unit energy storage is lower than set point, control diesel generating set restart;
G, according to the size of Storage Unit energy storage capacity, dynamically adjust the rotating speed of diesel generating set;
Running parameter in h, detection and the control Storage Unit;
I, carry out communication, obtain data such as lifting capacity, speed, power drain, and PLC is proposed the mechanism speed requirement according to the energy storage situation of Storage Unit with the PLC controller of rubbertyred container gantry crane.
Under Storage Unit operation irregularity situation, described electric energy through the AC/DC conversion directly is the corresponding travelling mechanism power supply of rubbertyred container gantry crane.
When the travelling mechanism of rubbertyred container gantry crane was in weight decline or retarding braking, Storage Unit reclaimed the regenerative electric energy that is descended and quickened the braking generation by weight.
Described regenerative electric energy is also controlled the brake unit and the brake resistance work of low capacity when the Storage Unit spill-over.
In addition, the present invention also provides a kind of rubbertyred container gantry crane electric power system, it is characterized in that: comprise
Diesel generating set provides low-power energy as the electric energy device for supplying for system;
The AC/DC transducer, input is connected with diesel generating set, and the electric energy that diesel generating set is generated carries out the rectification processing;
Storage Unit, input is connected with the AC/DC converter output end, and the electric current collection after the rectification is got up;
The DC/DC converter, input is connected with the output of Storage Unit, and the electric energy that Storage Unit is exported converts the constant high pressure electric current to; Output is connected with the DC master row of rubbertyred container gantry crane, supplies with each high-power travelling mechanism of rubbertyred container gantry crane in short-term.
In further improvement of the present invention, also be connected with the intelligent power management module between the described AC/DC transducer.
Described diesel generating set has speed regulator, and described intelligent power management module is also connected to described speed regulator.
The output of described AC/DC transducer also passes through the DC master row of a direct cross-over connection rubbertyred container gantry crane of change over switch.
Rubbertyred container gantry crane method of supplying power to of the present invention and system, by provide low-power energy as the electric energy device for supplying for system with diesel generating set and with Storage Unit as complete machine electric energy feed system, method with the accumulated time energy, for lifting mechanism provides high-power in short-term energy requirement, significantly reduced the Diesel engine generated output.Like this, at ordinary times little diesel generating set with tricklet to the Storage Unit energy storage of charging; During each mechanism of rubbertyred container gantry crane electronic work done, energy is gushed out from Storage Unit is surge.Adopt such technical scheme, the power supply plan of the existing relatively rubbertyred container gantry crane of the present invention is saved fuel oil 65%, have obvious social and economic benefits, in addition, do not have that " oil changes " such existing initial outlay is big, the transition operation is wasted time and energy, the problem of motor-driven, the flexible characteristic of having sacrificed that rubbertyred container gantry crane possessed originally yet.
Therefore, rubbertyred container gantry crane method of supplying power to of the present invention and system have and reduce the oil consumption of hanging significantly, improve the utilance of fuel oil, reach the advantage of energy-saving and emission-reduction purpose, and the maneuverability that has kept rubbertyred container gantry crane to have.
Description of drawings
Fig. 1 is a conventional tire formula gantry container crane electric power system schematic diagram.
Among the figure: 101, diesel generating set 102,103,104, circuit breaker 105, transformer 106, auxiliary equipment 107, inverter 108, frequency converter 181, lifting motor 109, dolly frequency converter 110,111, cart frequency converter 112 is braked unit 113, brake resistance
Fig. 2 is the electric power system schematic diagram that rubbertyred container gantry crane has adopted super capacitor.
Among the figure: 201, diesel generating set 211, diesel engine 221, generator 202, inverter 203, frequency converter 204, motor 205, super capacitor 206, dynamic braking unit and resistance
Fig. 3 is the rubbertyred container gantry crane electric power system schematic diagram of Japanese YASKAWA company.
Among the figure: 301, diesel generating set 311, diesel engine 321, generator 302, inverter 303, frequency converter 304, motor 305, super capacitor 306, dynamic braking unit and resistance 307, DC/DC transducer
Fig. 4 is an electric power system schematic diagram of the present invention.
Among the figure: 410, diesel generating set 411, diesel engine 412, generator 413, speed regulator 420, AC/DC transducer 430, intelligent power management module 440, Storage Unit 450, DC/DC converter 460, change over switch 470, circuit breaker 001, frequency converter 002 hoists, dolly frequency converter 003, cart 1 frequency converter 004, cart 2 frequency converters 005, auxiliary equipment and control power converter
Embodiment
Further specify technical scheme of the present invention below in conjunction with drawings and Examples.
As shown in Figure 4, rubbertyred container gantry crane electric power system of the present invention comprises diesel generating set 410, AC/DC transducer 420, intelligent power management module 430, Storage Unit 440, DC/DC converter 450, change over switch 460.
Wherein, diesel generating set 410 is made up of diesel engine 411 and generator 412, and diesel engine 411 has speed regulator 413, has the automatic speed regulation function.Diesel generating set 401 connect AC/DC transducers 420 through a circuit breaker 470, AC/DC transducer 420 is a diode rectification.AC/DC transducer 420 connect Storage Units 440 through intelligent power management module 430 again, Storage Unit 440 can be a super capacitor, also can be storage battery or other electrical storage device.Storage Unit 440 connects the DC/DC converter again, the DC/DC converter is each travelling mechanism power supply of rubbertyred container gantry crane through the DC master row of rubbertyred container gantry crane again, promptly be connected to the frequency converter 001 that hoists, dolly frequency converter 002, cart 1 frequency converter 003, cart 2 frequency converters 004, auxiliary equipment and control power converter 005.In addition, intelligent power management module 430 also connects the speed regulator 413 of diesel engine 411, and AC/DC transducer 420 is also through transforming the DC master row of switch 460 direct cross-over connection rubbertyred container gantry cranes.
Rubbertyred container gantry crane power supply process of the present invention is:
But the diesel engine 411 drive generators 412 by automatic speed regulation send the non-constant alternating current of 220-440V, 25-50HZ, through 420 rectifications of AC/DC transducer, (intelligent power management module 430 is according to Storage Unit 440 change in voltage through intelligent power management module 430 for the direct current that obtains, according to the relation of I=P/V, adjust charging current automatically and electric current be limited in the permissible value) Storage Unit 440 is charged.Storage Unit 440 voltage signals and rubbertyred container gantry crane electric-control system operational order are sent to speed regulator 413 inputs of diesel engine 411, jointly control the rotating speed of diesel engine 411, realize the purpose of pressing energy requirement regulator generator 412 energy output.Because Storage Unit 440 voltages can not suddenly change, so diesel engine 411 rotating speeds can not suddenly change yet, and this can be under the good working environment engine 412 all the time, and is of great advantage useful life to prolonging diesel engine.Each mechanism of rubbertyred container gantry crane and the required electric energy of auxiliary equipment provide by Storage Unit 440, its process is: (voltage 300-600V) is converted to the 600V stable DC by DC/DC transducer 450 and gives the power supply DC master row electric energy that Storage Unit 440 stores, power to each mechanism and auxiliary equipment by DC master row again, each travelling mechanism is when weight decline or retarding braking, and the regenerative electric energy of generation is all reclaimed by Storage Unit 440.
When Storage Unit breaks down, can start the emergency pattern, promptly pass through change over switch 460 with AC/DC transducer 420 and DC master row cross-over connection, at this moment software control is limited in 50% of normal speed with the lifting mechanism highest running speed, dolly and cart mechanism speed remain unchanged, but do not allow to hoist this moment and the trolley body interlock.
In the present invention, Storage Unit 440 electric power signal and the load signal that hoists can be introduced 413 speed regulator inputs of diesel engine 411, with the rotating speed of regulating diesel engine 413 and the automatic start-stop of finishing diesel engine, solve long-time underload and the unloaded fuel oil waste that causes.
In the present invention, intelligent power management module 430 is the speed regulating control of management diesel engine, the automatic start-stop control of diesel engine; Also manage the charging control of Storage Unit, concrete function is as follows:
1, the diesel engine 411 of automatic speed regulation drives generator 412 and sends the non-constant alternating current of 220～440V, 25～0HZ, delivers to diode rectification after smoothing reactor filtering, the direct current input intelligent power management module 430 that obtains;
2, intelligent power management module 430 is transformed into constant 600V direct current to 300～600V direct current of input, outputs to Storage Unit 440, charges.
3, Storage Unit 440 initial conditions, energy storage is few, and internal resistance is very low, and intelligent power management module 430 is carried out the current limliting management when precharge.
4, Storage Unit 440 energy storage are lower than when setting threshold values, and intelligent power management module 430 does not allow each travelling mechanism action of rubbertyred container gantry crane, and the wait charging process is carried out.
When 5, diesel generating set 410 was worked, intelligent power management module 430 kept Storage Unit 440 normalities are charged.
6, during Storage Unit 440 energy storage quotas, intelligent power management module 430 control diesel generating sets 410 turn-off.
When 7, Storage Unit 440 energy storage were lower than set point, intelligent power management module 430 control diesel generating sets 410 restarted.
8, according to the size of Storage Unit 440 energy storage capacities, intelligent power management module 430 is dynamically adjusted the rotating speed of diesel engine generator.
9, intelligent power management module 430 detect and control Storage Unit 440 in electric current, temperature, junior units parameter such as all press.
10, intelligent power management module 430 is carried out communication with rubbertyred container gantry crane PLC controller, obtains data such as lifting capacity, speed, power drain, and according to the energy storage situation of Storage Unit 440 PLC is proposed the mechanism speed requirement.
In the present invention, DC/DC converter 450 is transformed into stable 600V direct current to 300～600V direct current of Storage Unit 440 outputs and offers each travelling mechanism need for electricity of rubbertyred container gantry crane; Travelling mechanism is when weight decline or retarding braking, and the regenerative electric energy of generation is all reclaimed by DC/DC converter 450 input Storage Units 440; Regenerative electric energy only when Storage Unit 440 spill-overs, is just controlled the brake unit and the brake resistance work of a low capacity.
By adopting technical scheme of the present invention, the rubbertyred container gantry crane fuel consumption can descend more than 65%, by annual operation 100,000 Units of every rubbertyred container gantry crane, 2 liters/Unit of average fuel consumption, can save 130,000 liters of calculating of fuel oil every year, present national outfit amount is above 2000, if wherein half adopts the present invention, can save 1.3 hundred million liters of fuel oils every year, reduce expenses 600,000,000 yuan, reduce 340,000 tons of CO2 emissions, reduce about 1000 tons of sulfur dioxide (SO2) emissions, its economic benefit and social benefit are fairly obvious.
Therefore, the rubbertyred container gantry crane method of supplying power to and the system of invention have the oil consumption that reduces rubbertyred container gantry crane significantly, improve the utilance of fuel oil, reach the advantage of energy-saving and emission-reduction purpose, and the maneuverability that has kept rubbertyred container gantry crane to have.
Those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in claims scope of the present invention variation, the modification of above embodiment.
Claims (10)
1, a kind of rubbertyred container gantry crane method of supplying power to is characterized in that, comprises the steps:
A, diesel generating set carry out the small-power generating at ordinary times;
B, the electric energy that generates is charged to Storage Unit after the AC/DC conversion;
C, the electric energy that stores is supplied with each high-power travelling mechanism of rubbertyred container gantry crane in short-term through the DC/DC conversion.
2, rubbertyred container gantry crane method of supplying power to according to claim 1, it is characterized in that: among the described step b, the electric energy of described generation is collected by Storage Unit under the intelligent power management module controls after the AC/DC conversion, and the intelligent power management module is also controlled the speed regulator work of diesel generating set.
3, rubbertyred container gantry crane method of supplying power to according to claim 2 is characterized in that: described intelligent power management module have following each or appoint several functions:
A, with the fluctuation direct current be transformed into constant DC, export to Storage Unit;
B, few in energy storage, the Storage Unit initial condition that internal resistance is very low is carried out the current limliting management during to Storage Unit precharge;
C, Storage Unit energy storage are lower than when setting threshold values, stop each mechanism action of rubbertyred container gantry crane, and the wait charging process is carried out;
When d, diesel generating set work, keep the Storage Unit normality is charged;
When e, Storage Unit energy storage quota, the control diesel generating set turn-offs;
F, when the Storage Unit energy storage is lower than set point, control diesel generating set restart;
G, according to the size of Storage Unit energy storage capacity, dynamically adjust the rotating speed of diesel generating set;
Running parameter in h, detection and the control Storage Unit;
I, carry out communication, obtain data such as lifting capacity, speed, power drain, and PLC is proposed the mechanism speed requirement according to the energy storage situation of Storage Unit with the PLC controller of rubbertyred container gantry crane.
4, rubbertyred container gantry crane method of supplying power to according to claim 1 and 2, it is characterized in that: under Storage Unit operation irregularity situation, described electric energy through the AC/DC conversion directly is the corresponding travelling mechanism power supply of rubbertyred container gantry crane.
5, rubbertyred container gantry crane method of supplying power to according to claim 1 and 2, it is characterized in that: when the travelling mechanism of rubbertyred container gantry crane was in weight decline or retarding braking, Storage Unit reclaimed the regenerative electric energy that is descended and quickened the braking generation by weight.
6, rubbertyred container gantry crane method of supplying power to according to claim 5 is characterized in that: described regenerative electric energy is also controlled the brake unit and the brake resistance work of low capacity when the Storage Unit spill-over.
7, a kind of rubbertyred container gantry crane electric power system is characterized in that comprising:
Diesel generating set provides low-power energy as the electric energy device for supplying for system;
The AC/DC transducer, input is connected with diesel generating set, and the electric energy that diesel generating set is generated carries out the rectification processing;
Storage Unit, input is connected with the AC/DC converter output end, and the electric current collection after the rectification is got up;
The DC/DC converter, input is connected with the output of Storage Unit, and the electric energy that Storage Unit is exported converts the constant high pressure electric current to; Output is connected with the DC master row of rubbertyred container gantry crane, supplies with each high-power travelling mechanism of rubbertyred container gantry crane in short-term.
8, rubbertyred container gantry crane electric power system according to claim 7 is characterized in that: also be connected with the intelligent power management module between the described AC/DC transducer.
9, rubbertyred container gantry crane electric power system according to claim 8, it is characterized in that: the rubbertyred container gantry crane electric power system, it is characterized in that described diesel generating set has speed regulator, described intelligent power management module is also connected to described speed regulator.
10, according to the described rubbertyred container gantry crane electric power system of arbitrary claim in the claim 7 to 9, it is characterized in that: the output of described AC/DC transducer also passes through the DC master row of a direct cross-over connection rubbertyred container gantry crane of change over switch.
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| CN200910048278A CN101521470B (en) | 2009-03-26 | 2009-03-26 | Power supply method and power supply system for rubber-tyred container gantry crane |
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| CN200910048278A CN101521470B (en) | 2009-03-26 | 2009-03-26 | Power supply method and power supply system for rubber-tyred container gantry crane |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101924478A (en) * | 2009-06-16 | 2010-12-22 | 孙枫 | Power supply method of mobile type hoisting equipment and system thereof |
| CN102457060A (en) * | 2010-10-26 | 2012-05-16 | 深圳市汇川技术股份有限公司 | Injection molding machine having energy-saving device and inverter |
| CN102714424A (en) * | 2011-01-19 | 2012-10-03 | 三菱重工业株式会社 | Power-supply device, crane, and power-supply method |
| CN103771267A (en) * | 2014-02-14 | 2014-05-07 | 上海振华重工(集团)股份有限公司 | Container hoisting device electrified by LNG (Liquefied Natural Gas) fuel gas power |
| WO2017161842A1 (en) * | 2016-03-24 | 2017-09-28 | 深圳市兆涵科技发展有限公司 | Three-power hybrid energy saving system for rubber-tired gantry crane |
Family Cites Families (6)
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| CN1240607C (en) * | 2002-12-04 | 2006-02-08 | 上海振华港口机械（集团）股份有限公司 | Tire type gantry container crane using super capacitor |
| CN2874892Y (en) * | 2005-11-29 | 2007-02-28 | 余柏鋆 | Generator power conversion energy saving device for tyre type container gantry crane |
| CN200944575Y (en) * | 2006-09-01 | 2007-09-05 | 罗中柱 | DC busbar supplying crane power system |
| CN1945963A (en) * | 2006-09-01 | 2007-04-11 | 罗中柱 | DC bus powered crane power system |
| CN100515911C (en) * | 2007-02-02 | 2009-07-22 | 武汉理工大学 | Flow type hoisting machinery power device utilizing accumulator |
| CN201038814Y (en) * | 2007-05-21 | 2008-03-19 | 哈尔滨巨容新能源有限公司 | Tyre type container crane diesel-electric set idling power set |
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2009
- 2009-03-26 CN CN200910048278A patent/CN101521470B/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101924478A (en) * | 2009-06-16 | 2010-12-22 | 孙枫 | Power supply method of mobile type hoisting equipment and system thereof |
| CN102457060A (en) * | 2010-10-26 | 2012-05-16 | 深圳市汇川技术股份有限公司 | Injection molding machine having energy-saving device and inverter |
| CN102714424A (en) * | 2011-01-19 | 2012-10-03 | 三菱重工业株式会社 | Power-supply device, crane, and power-supply method |
| CN102714424B (en) * | 2011-01-19 | 2015-07-15 | 三菱重工业株式会社 | Power-supply device, crane, and power-supply method |
| CN103771267A (en) * | 2014-02-14 | 2014-05-07 | 上海振华重工(集团)股份有限公司 | Container hoisting device electrified by LNG (Liquefied Natural Gas) fuel gas power |
| WO2017161842A1 (en) * | 2016-03-24 | 2017-09-28 | 深圳市兆涵科技发展有限公司 | Three-power hybrid energy saving system for rubber-tired gantry crane |
| US20170275140A1 (en) * | 2016-03-24 | 2017-09-28 | Shenzhen Zhaohan Technology Development Co., Ltd. | Three-power hybrid energy saving system of a rubber tyred gantry crane |
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