CN101435451A - Movable arm potential energy recovery method and apparatus of hydraulic excavator - Google Patents
Movable arm potential energy recovery method and apparatus of hydraulic excavator Download PDFInfo
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- CN101435451A CN101435451A CNA2008101438747A CN200810143874A CN101435451A CN 101435451 A CN101435451 A CN 101435451A CN A2008101438747 A CNA2008101438747 A CN A2008101438747A CN 200810143874 A CN200810143874 A CN 200810143874A CN 101435451 A CN101435451 A CN 101435451A
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Abstract
The invention discloses a method for recovering potential energy of a movable arm of a hydraulic digging machine and a device thereof. The method comprises the following steps: firstly, the potential energy is stored through an energy accumulator in the retraction process of a hydraulic cylinder; and secondly the stored energy in the energy accumulator drives a generator to generate electricity, thereby realizing the recovery of the potential energy of the movable arm of the hydraulic digging machine. A mode for storing the potential energy is to convert the potential energy into pressure energy. The energy accumulator and the generator are connected through a proportioning valve so as to control the rotational speed of the generator. The method realizes high-efficiency recovery of the potential energy of the movable arm of the hydraulic digging machine; the principle of the method is to skillfully change the working time of hydraulic oil for power generation through the function of energy storage of the energy accumulator and provide effective buffering for recovering the potential energy; in addition, through the throttling control of the proportioning valve, the method reduces pressure fluctuation of the hydraulic oil in the power generation process, realizes the adjustment of the working rotational speed of the generator, improves the working efficiency of the generator and further improves the efficiency of energy recovery.
Description
Technical field
The invention belongs to electromechanical integration technology area, relate to a kind of Hydraulic Excavator's Boom potential energy recovery method and device.
Background technique
Hydraulic shovel is a kind of typical periodic job equipment, and the decline of swing arm is the typical link of its operation cycle.When Hydraulic Excavator's Boom descended, common hydraulic shovel was the rate of descent of regulating working arm by the aperture of control valve, realized stopping of swing arm descending motion by closed control valve.Common hydraulic shovel does not have energy recycle device usually, and swing arm is transferred the most of consumption of the potential energy that discharges in the process on control valve, has caused the waste of energy.
Hybrid power hydraulic excavator is owing to be equipped with storage battery and generator, can be recycled into electric energy to the potential energy in the Hydraulic Excavator's Boom decline process in theory and is stored in the storage battery, is used further to the drive motor acting in due course.Existing oil electric mixed dynamic Hydraulic Excavator's Boom potential energy recovery method adopts serial connection oil hydraulic motor and generator on swing arm oil hydraulic cylinder oil circuit mostly, by hydraulic motor-driving generator the potential energy of swing arm is recycled into electric energy.Because the time that can carry out energy recovery in the Hydraulic Excavator's Boom decline process is usually less than 2 seconds, and the pressure surge of hydraulic oil is big in the callback course, it is very low to cause generator to be operated in the efficient of inefficient district, energy recovery.
Summary of the invention
Technical problem to be solved by this invention provides a kind of Hydraulic Excavator's Boom potential energy recovery method and device, to improve the reuse efficiency of Hydraulic Excavator's Boom potential energy.
Technical solution of the present invention is as follows:
A kind of Hydraulic Excavator's Boom potential energy recovery method is characterized in that, by accumulator the potential energy in the oil hydraulic cylinder retraction process is stored earlier, again the energy storage in the accumulator is driven generator for electricity generation, realizes the recovery of Hydraulic Excavator's Boom potential energy.
The mode of described storage of potential energy is that potential energy converting and energy is become the pressure energy.
The passing ratio valve connects the rotating speed with the control generator between described accumulator and the generator.
A kind of Hydraulic Excavator's Boom potential energy recovering device is characterized in that, comprises oil hydraulic cylinder, fuel tank, accumulator, motor, generator and energy storage device; One end of described oil hydraulic cylinder is connected with fuel tank by first solenoid valve; The other end is connected with fuel tank by second solenoid valve; The rear end of described oil hydraulic cylinder is connected by the 3rd solenoid valve with accumulator; Described accumulator is connected with generator by the 4th solenoid valve, motor; Described generator is electrically connected with energy storage device.
Described Hydraulic Excavator's Boom potential energy recovering device also comprises controller, and described controller is connected with first solenoid valve, second solenoid valve, the 3rd solenoid valve and the control end of the 4th solenoid valve.
Described first solenoid valve, second solenoid valve and the 3rd solenoid valve are two-position two-way solenoid valve.
Described the 4th solenoid valve is the bi-bit bi-pass Proportional valve.
Described generator is connected with energy storage device by inverter.
Beneficial effect:
The present invention has realized the high efficiente callback of Hydraulic Excavator's Boom potential energy, its principle is that the energy storage effect by accumulator has changed the operating time that hydraulic oil is used to generate electricity dexterously, efficient buffer is provided for the recovery of potential energy, in addition, the throttling control of passing ratio valve has reduced the pressure surge of hydraulic oil in the power generation process, realize the adjusting of generator working speed, improved the working efficiency of generator, and then improved the efficient of energy recovery.
By accumulator the potential energy in the oil hydraulic cylinder retraction process is converted to the pressure energy earlier, by the control of controller, the pressure oil in the accumulator is used to drive generator for electricity generation then.Because the energy storage effect of accumulator, the deficiency when having avoided existing energy recovery can only occur in the oil hydraulic cylinder withdrawal has effectively prolonged the time of energy recovery.
By the aperture of controller adjustment bi-bit bi-pass Proportional valve, the pressure reduction when keeping hydraulic oil to flow through generator remains unchanged substantially, realizes the adjusting of generator working speed, guarantees that generator is operated in high efficient area.Overcome the low shortcoming of original potential energy recovering device potential energy reuse efficiency thus.
Description of drawings
Fig. 1 is a Hydraulic Excavator's Boom potential energy energy recycle device schematic representation.
Embodiment
Following example is to further specify of the present invention, rather than the restriction scope of invention.
Embodiment 1:
As shown in Figure 1, oil electric mixed dynamic Hydraulic Excavator's Boom potential energy recovering device, comprise oil hydraulic cylinder 3, controller 1, accumulator 2, two-position two- way solenoid valve 4,5 and 7, (wherein two-position two-way solenoid valve 4 for bi-bit bi-pass Proportional valve 6,7 and 5 and first solenoid valve of the respectively corresponding summary of the invention part of bi-bit bi-pass Proportional valve 6, second solenoid valve, the 3rd solenoid valve and the 4th solenoid valve), generator 9, oil hydraulic motor 10, inverter 11, accumulator 12 and fuel tank 8, two-position two- way solenoid valve 4,5 and 7 are normally closed solenoid valve, bi-bit bi-pass Proportional valve 6 is normally closed Proportional valve, two-position two-way solenoid valve 4 is installed between oil hydraulic cylinder 3 rod chamber hydraulic fluid ports and the fuel tank 8, two-position two-way solenoid valve 7 is installed between oil hydraulic cylinder 3 rodless cavity hydraulic fluid ports and the fuel tank 8, two-position two-way solenoid valve 5 one ends link to each other with the hydraulic fluid port of oil hydraulic cylinder 3 rodless cavities, and the other end links to each other with bi-bit bi-pass Proportional valve 6.Accumulator 2 is installed between two-position two-way solenoid valve 5 and the bi-bit bi-pass Proportional valve 6.Oil hydraulic motor 10, generator 9, inverter 11 and accumulator 12 have been connected in series after the bi-bit bi-pass Proportional valve 6 successively.The output of controller 2 links to each other with two-position two- way solenoid valve 4,5,7, bi-bit bi-pass Proportional valve 6 and generator 9 respectively.Need to prove in addition: label 8 correspondences among Fig. 1 be same fuel tank, be drawn as the standard that a plurality of just industries are drawn.
The working procedure of this device is as follows: when the piston rod of oil hydraulic cylinder 3 is withdrawn, if do not need to carry out energy recovery, then open two-position two-way solenoid valve 4,7, close two-position two-way solenoid valve 5 and bi-bit bi-pass Proportional valve 6, hydraulic oil in the fuel tank 8 enters the rod chamber of oil hydraulic cylinder 3 by two-position two-way solenoid valve 4, and the hydraulic oil in oil hydraulic cylinder 3 rodless cavities is by two-position two-way solenoid valve 7 oil sump tanks; Carry out energy recovery if desired, then close two-position two-way solenoid valve 7 and bi-bit bi-pass Proportional valve 6 earlier, connect two-position two-way solenoid valve 4,5 again, hydraulic oil in the fuel tank 8 enters the rod chamber of oil hydraulic cylinder 3 by two-position two-way solenoid valve 4, and the hydraulic oil in oil hydraulic cylinder 3 rodless cavities is filled in the accumulator 2.When needs carry out energy recovery, controller 1 is closed two-position two- way solenoid valve 5,7, connect two-position two-way solenoid valve 4 and bi-bit bi-pass Proportional valve 6, pressure oil in the accumulator 2 flows into oil hydraulic motor 10, drive generator 9 generatings, the electric energy that generator 9 produces is stored in the accumulator 12 by inverter 11.
By accumulator 2 potential energy in oil hydraulic cylinder 3 retraction process is converted to the pressure energy earlier, by the control of controller 1, the pressure oil in the accumulator 2 is used to drive generator 9 generatings then.Because the energy storage effect of accumulator 2, the deficiency when having avoided existing energy recovery can only occur in oil hydraulic cylinder 3 withdrawals has effectively prolonged the time of energy recovery.
Adjust the aperture of bi-bit bi-pass Proportional valve 6 by controller 1, pressure reduction when keeping hydraulic oil to flow through generator 9 remains unchanged substantially, realize electric energy that generator 9 outputs are stable and the adjusting that realizes motor 9 working speeds, guarantee that generator 9 is operated in high efficient area.
Claims (8)
1, a kind of Hydraulic Excavator's Boom potential energy recovery method is characterized in that, by accumulator the potential energy in the oil hydraulic cylinder retraction process is stored earlier, again the energy storage in the accumulator is driven generator for electricity generation, realizes the recovery of Hydraulic Excavator's Boom potential energy.
2, Hydraulic Excavator's Boom potential energy recovery method according to claim 1 is characterized in that, the mode of described storage of potential energy is that potential energy converting and energy is become the pressure energy.
3, Hydraulic Excavator's Boom potential energy recovery method according to claim 1 and 2 is characterized in that, the passing ratio valve connects the rotating speed with the control generator between described accumulator and the generator.
4, a kind of Hydraulic Excavator's Boom potential energy recovering device is characterized in that, comprises oil hydraulic cylinder, fuel tank, accumulator, motor, generator and energy storage device; One end of described oil hydraulic cylinder is connected with fuel tank by first solenoid valve; The other end is connected with fuel tank by second solenoid valve; The rear end of described oil hydraulic cylinder is connected by the 3rd solenoid valve with accumulator; Described accumulator is connected with generator by the 4th solenoid valve, motor; Described generator is electrically connected with energy storage device.
5, Hydraulic Excavator's Boom potential energy recovering device according to claim 4 is characterized in that, also comprises controller, and described controller is connected with first solenoid valve, second solenoid valve, the 3rd solenoid valve and the control end of the 4th solenoid valve.
6, Hydraulic Excavator's Boom potential energy recovering device according to claim 4 is characterized in that, described first solenoid valve, second solenoid valve and the 3rd solenoid valve are two-position two-way solenoid valve.
7, Hydraulic Excavator's Boom potential energy recovering device according to claim 4 is characterized in that, described the 4th solenoid valve is the bi-bit bi-pass Proportional valve.
8, according to each described Hydraulic Excavator's Boom potential energy recovering device of claim 4～7, it is characterized in that described generator is connected with energy storage device by inverter.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101438747A CN101435451B (en) | 2008-12-09 | 2008-12-09 | Movable arm potential energy recovery method and apparatus of hydraulic excavator |
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| CN2008101438747A CN101435451B (en) | 2008-12-09 | 2008-12-09 | Movable arm potential energy recovery method and apparatus of hydraulic excavator |
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| CN101435451A true CN101435451A (en) | 2009-05-20 |
| CN101435451B CN101435451B (en) | 2012-03-28 |
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