CN105156412A - Crane luffing energy recovery-recycle method and system, and crane - Google Patents
Crane luffing energy recovery-recycle method and system, and crane Download PDFInfo
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- CN105156412A CN105156412A CN201410680034.XA CN201410680034A CN105156412A CN 105156412 A CN105156412 A CN 105156412A CN 201410680034 A CN201410680034 A CN 201410680034A CN 105156412 A CN105156412 A CN 105156412A
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Abstract
The invention discloses a crane luffing energy recovery-recycle method and system, and a crane. The crane luffing energy recovery-recycle method comprises that a luffing oil cylinder converts gravitational potential energy generated during the luffing-down process of a crane arm of the crane into hydraulic energy; a first hydraulic power unit converts the hydraulic energy generated by the luffing oil cylinder into mechanical energy of a main transmission shaft, and the first hydraulic power unit is communicated with a main pump coaxially; the main transmission shaft drives a second hydraulic power unit to rotate through a transfer case, the transfer case is communicated with an output shaft of an engine, and the engine is connected in parallel with the second hydraulic power unit through the transfer case; the second hydraulic power unit supplements liquid to an energy accumulator, and mechanical energy of the second hydraulic power unit is converted into hydraulic energy, and the hydraulic energy is stored. During the luffing-down process, the gravitational potential energy of the sling load and the crane arm is recycled, energy saving and emission reduction are achieved, and heat generated by the system is reduced.
Description
Technical field
The present invention relates to engineering machinery field, particularly a kind of crane amplitude variation energy regenerating and reuse method and system and hoist.
Background technique
Hoist is a kind of gravity Work machine, when luffing falls, and the gravity acting of lift heavy and shear leg.
Choke area at present by controlling equilibrium valve realizes the throttle grverning of decline process, and the energy of weight decline process all transforms in order to heat energy, causes the waste of energy.Hydraulic fluid temperature can be caused simultaneously to raise, the reliability of hydraulic element based on durability is reduced.Raising to reduce oil temperature, just needing the power increasing radiator.
Summary of the invention
In view of above technical problem, the invention provides a kind of crane amplitude variation energy regenerating and reuse method and system and hoist, by luffing is fallen action time, the gravitational potential energy of lift heavy and shear leg is recycled, achieve energy-saving and emission-reduction, and reduce the heating of system.
According to an aspect of the present invention, a kind of crane amplitude variation energy regenerating and reuse method are provided, comprise:
The gravitational potential energy produced in crane boom luffing dropping process is converted to hydraulic energy by amplitude oil cylinder;
The hydraulic energy that amplitude oil cylinder produces is converted to the mechanical energy of main drive shaft by the first hydraulic power unit, wherein the first hydraulic power unit and main pump coaxial communication;
Main drive shaft drives the second hydraulic power unit to rotate by transfer case, and wherein transfer case is communicated with on engine output shaft, and motor is in parallel with the second hydraulic power unit by transfer case;
Second hydraulic power unit, to accumulator topping up, converts the mechanical energy of the second hydraulic power unit to hydraulic energy and stores.
In one embodiment of the invention, described method also comprises:
In shear leg luffing dropping process, adjust the discharge capacity of the first hydraulic power unit, to control the luffing rate of descent of shear leg.
In one embodiment of the invention, to be driven before the second hydraulic power unit carries out the step rotated by transfer case at main drive shaft, described method also comprises:
The load torque T of transfer case exported to by Real-time Obtaining first hydraulic power unit
h;
Obtain the maximum recovery torque T of the second hydraulic power unit
xmax;
Judge T
xmaxwhether be less than T
h;
If T
xmaxbe less than T
h, then the discharge capacity of the second hydraulic power unit is adjusted to maximum, makes the recovery torque T of the second hydraulic power unit
x=T
xmax, pass through T
xcommon equilibrium T is carried out with engine braking moment
h.
In one embodiment of the invention, described method also comprises:
If T
xmaxbe not less than T
h, then the recovery torque T of the second hydraulic power unit is made by the discharge capacity of adjustment second hydraulic power unit
x=T
h.
In one embodiment of the invention, after the second hydraulic power unit is to the step of accumulator topping up, also comprise:
When the pressure of accumulator reaches predetermined maximum service pressure, disconnect being communicated with of the second hydraulic power unit and transfer case, rely on engine braking moment to balance T completely
h.
In one embodiment of the invention, described method also comprises:
When hoist carries out getting on the bus operation, the hydraulic energy that accumulator release stores, for hoist provides driving force.
In one embodiment of the invention, when crane operates, the step of the hydraulic energy that accumulator release stores comprises:
When crane boom luffing hoists, the hydraulic energy that accumulator discharges is converted to the mechanical energy of main drive shaft by the second hydraulic power unit;
The mechanical energy of main drive shaft is converted to hydraulic energy by main pump, hoists with the luffing driving amplitude oil cylinder to realize shear leg.
In one embodiment of the invention, described method also comprises: hoist in process at shear leg luffing, adjusts main pump delivery, to control luffing lifting velocity.
In one embodiment of the invention, before the hydraulic energy that accumulator discharges being converted at the second hydraulic power unit the step of the mechanical energy of main drive shaft, described method also comprises:
The load torque T that Real-time Obtaining main pump exports
d;
Obtain the available maximum drive torque T of the second hydraulic power unit
xcmax;
Judge T
xcmaxwhether be less than T
d;
If T
xcmaxbe less than T
d, then the discharge capacity of the second hydraulic power unit is transferred to maximum, makes the driving torque T that the second hydraulic power unit provides
xc=T
xcmax, pass through T
xccommon Host actuating pump is carried out with engine driving torque.
In one embodiment of the invention, described method also comprises: if T
xcmaxbe not less than T
d, then adjust the discharge capacity of the second hydraulic power unit, make the driving torque T that the second hydraulic power unit provides
xc=T
d.
In one embodiment of the invention, after the hydraulic energy that accumulator discharges being converted at the second hydraulic power unit the step of the mechanical energy of main drive shaft, also comprise:
When the pressure of accumulator reaches predetermined Minimum operating pressure, disconnect being communicated with of the second hydraulic power unit and transfer case, rely on engine-driving main pump completely.
According to a further aspect in the invention, a kind of crane amplitude variation energy regenerating and reutilization system are provided, comprise: amplitude oil cylinder, the first hydraulic power unit, transfer case, the second hydraulic power unit and accumulator, wherein the first hydraulic power unit and main pump coaxial communication, transfer case is communicated with on engine output shaft, motor is in parallel with the second hydraulic power unit by transfer case, wherein:
Amplitude oil cylinder, for being converted to hydraulic energy by the gravitational potential energy produced in crane boom luffing dropping process;
First hydraulic power unit, the hydraulic energy for amplitude oil cylinder being produced is converted to the mechanical energy of main drive shaft;
Transfer case, for driving the second hydraulic power unit to rotate by the mechanical energy of main drive shaft;
Second hydraulic power unit, for by accumulator topping up, converts the mechanical energy of the second hydraulic power unit to hydraulic energy and stores;
Accumulator, for storing hydraulic energy.
In one embodiment of the invention, described system also comprises the first discharge capacity adjustment module, wherein:
First discharge capacity adjustment module, in shear leg luffing dropping process, adjusts the discharge capacity of the first hydraulic power unit, to control the luffing rate of descent of shear leg.
In one embodiment of the invention, described system also comprises the first moment acquisition module, the second moment acquisition module, the first identification module and the second discharge capacity adjustment module, wherein:
First moment acquisition module, exports to the load torque T of transfer case for Real-time Obtaining first hydraulic power unit
h;
Second moment acquisition module, for obtaining the maximum recovery torque T of the second hydraulic power unit
xmax;
First identification module, for judging T
xmaxwhether be less than T
h;
Second discharge capacity adjustment module, for the judged result according to the first identification module, at T
xmaxbe less than T
htime, the discharge capacity of the second hydraulic power unit is adjusted to maximum, makes the recovery torque T of the second hydraulic power unit
x=T
xmax, pass through T
xcommon equilibrium T is carried out with engine braking moment
h.
In one embodiment of the invention, the second discharge capacity adjustment module also for the judged result according to the first identification module, at T
xmaxbe not less than T
htime, the recovery torque T of the second hydraulic power unit is made by the discharge capacity adjusting the second hydraulic power unit
x=T
h.
In one embodiment of the invention, described system also comprises the first pressure transducer and the first switch, wherein:
First pressure transducer, for detecting the pressure of accumulator;
First switch, when the pressure for detecting at the first pressure transducer reaches predetermined maximum service pressure, disconnects being communicated with of the second hydraulic power unit and transfer case, and dependence engine braking moment balances T completely
h.
In one embodiment of the invention, when accumulator is also for carrying out at hoist getting on the bus operation, the hydraulic energy that release stores, for hoist provides driving force.
In one embodiment of the invention, the hydraulic energy that accumulator discharges, also for when crane boom luffing hoists, is converted to the mechanical energy of main drive shaft by the second hydraulic power unit; Main pump also for the mechanical energy of main drive shaft is converted to hydraulic energy, hoists with the luffing driving amplitude oil cylinder to realize shear leg.
In one embodiment of the invention, described system also comprises the 3rd discharge capacity adjustment module, wherein:
3rd discharge capacity adjustment module, for hoisting in process at shear leg luffing, adjusts main pump delivery, to control luffing lifting velocity.
In one embodiment of the invention, described system also comprises the 3rd moment acquisition module, the 4th moment acquisition module, the second identification module, wherein:
3rd moment acquisition module, for the load torque T that Real-time Obtaining main pump exports
d;
4th moment acquisition module, for obtaining the available maximum drive torque T of the second hydraulic power unit
xcmax;
Second identification module, for judging T
xcmaxwhether be less than T
d;
Second discharge capacity adjustment module also for the judged result according to the second identification module, at T
xcmaxbe less than T
dtime, the discharge capacity of the second hydraulic power unit is transferred to maximum, makes the driving torque T that the second hydraulic power unit provides
xc=T
xcmax, pass through T
xccommon Host actuating pump is carried out with engine driving torque.
In one embodiment of the invention, the second discharge capacity adjustment module also for the judged result according to the second identification module, at T
xcmaxbe not less than T
dtime, adjust the discharge capacity of the second hydraulic power unit, make the driving torque T that the second hydraulic power unit provides
xc=T
d.
In one embodiment of the invention, when the pressure of the first switch also for detecting at the first pressure transducer reaches predetermined Minimum operating pressure, disconnect being communicated with of the second hydraulic power unit and transfer case, completely dependence engine-driving main pump.
According to a further aspect in the invention, provide a kind of hoist, comprise the crane amplitude variation energy regenerating described in above-mentioned any one embodiment and reutilization system.
The present invention is by luffing decline process, adopt and regulate luffing rate of descent to the mode of accumulator topping up, instead of the mode of current employing equilibrium valve speed governing, reduce the heating value of system, extend the working life of hydraulic element, and hoist radiation system power can be reduced.
Description of the invention provides in order to example with for the purpose of describing, and is not exhaustively or limit the invention to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.Selecting and describing embodiment is in order to principle of the present invention and practical application are better described, and enables those of ordinary skill in the art understand the present invention thus design the various embodiments with various amendment being suitable for special-purpose.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technological scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the schematic diagram of crane amplitude variation energy regenerating of the present invention and a reutilization system embodiment.
Fig. 2 is the schematic diagram of crane amplitude variation energy regenerating of the present invention and another embodiment of reutilization system.
Fig. 3 is the schematic diagram of crane amplitude variation energy regenerating of the present invention and the another embodiment of reutilization system.
Fig. 4 is the schematic diagram of crane amplitude variation energy regenerating of the present invention and a reuse method embodiment.
Fig. 5 is the schematic diagram of crane amplitude variation energy regenerating of the present invention and another embodiment of reuse method.
Fig. 6 is the schematic diagram of crane amplitude variation energy regenerating of the present invention and the another embodiment of reuse method.
Fig. 7 is the schematic diagram of crane amplitude variation energy regenerating of the present invention and the another embodiment of reuse method.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technological scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Illustrative to the description only actually of at least one exemplary embodiment below, never as any restriction to the present invention and application or use.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Unless specifically stated otherwise, otherwise positioned opposite, the numerical expression of the parts of setting forth in these embodiments and step and numerical value do not limit the scope of the invention.
Meanwhile, it should be understood that for convenience of description, the size of the various piece shown in accompanying drawing is not draw according to the proportionate relationship of reality.
May not discuss in detail for the known technology of person of ordinary skill in the relevant, method and apparatus, but in the appropriate case, described technology, method and apparatus should be regarded as a part of authorizing specification.
In all examples with discussing shown here, any occurrence should be construed as merely exemplary, instead of as restriction.Therefore, other example of exemplary embodiment can have different values.
It should be noted that: represent similar terms in similar label and letter accompanying drawing below, therefore, once be defined in an a certain Xiang Yi accompanying drawing, then do not need to be further discussed it in accompanying drawing subsequently.
Fig. 1 is the schematic diagram of crane amplitude variation energy regenerating of the present invention and a reutilization system embodiment.As shown in Figure 1, described crane amplitude variation energy regenerating and reutilization system comprise: amplitude oil cylinder 1, first hydraulic power unit 2, transfer case 3, second hydraulic power unit 4 and accumulator 5, luffing equilibrium valve 10, main reversing valve 9, main pump 6 and motor 7, wherein:
The oil outlet of main pump 6 is communicated with the first actuator port P of main reversing valve 9, and the second actuator port A of main reversing valve 9 is communicated with the first actuator port C of luffing equilibrium valve 10, and the second actuator port D of luffing equilibrium valve 10 is communicated with the rodless cavity of amplitude oil cylinder 1.
First actuator port C of luffing equilibrium valve 10 is communicated with the filler opening of the first hydraulic power unit 2, first hydraulic power unit 2 is coaxially connected with main pump 6, transfer case 3 is connected to motor 7 on the output shaft of main pump 6, motor 7 is in parallel with the second hydraulic power unit 4 by transfer case 3, and the second hydraulic power unit 4 is communicated with accumulator 5.
Amplitude oil cylinder 1, for being converted to hydraulic energy by the gravitational potential energy produced in crane boom luffing dropping process.
First hydraulic power unit 2, the hydraulic energy for amplitude oil cylinder being produced is converted to the mechanical energy of main drive shaft.
Transfer case 3, for driving the second hydraulic power unit to rotate by the mechanical energy of main drive shaft.
Second hydraulic power unit 4, for by accumulator topping up, converts the mechanical energy of the second hydraulic power unit to hydraulic energy and stores.
Accumulator 5, for storing hydraulic energy.
The crane amplitude variation energy regenerating provided based on the above embodiment of the present invention and reutilization system, can the energy of effectively reclaiming crane luffing operation lift heavy and shear leg decline process, then recycled, reduced hoisting operation fuel consume, energy-saving and emission-reduction.The present invention is in luffing decline process, adopt and regulate luffing rate of descent to the mode of accumulator topping up, instead of the mode of current employing equilibrium valve speed governing, reduce the heating value of system, extend the working life of hydraulic element, and hoist radiation system power can be reduced.
In one embodiment of the invention, the first hydraulic power unit 2 comprises the first variable displacement pump and the first pump motor; Second hydraulic power unit 4 comprises the second variable displacement pump and the second pump motor.
In one embodiment of the invention, as shown in Figure 1, described system also comprises pilot control, the first selector valve 11, second selector valve 13, first cartridge valve 12 and shuttle valve 14, wherein:
The oil outlet of pilot control is communicated with the first actuator port H of the first selector valve 11, and the second actuator port F of the first selector valve 11 is communicated with the control port of luffing equilibrium valve.
First filler opening of the second selector valve 13 is communicated with the oil outlet of shuttle valve 14, and first, second filler opening of shuttle valve 14 is communicated with oil outlet S with the first actuator port R of the first cartridge valve 12 respectively.
As shown in Figure 1, in luffing dropping process, electromagnet 1Y, 4Y are energized, and amplitude oil cylinder 1 and the first hydraulic power unit 2 form pump control cylinder loop, and main reversing valve 9 is in meta, the first actuator port P of main reversing valve and the second actuator port A not conducting.
Electromagnet 4Y obtains electric, first selector valve 11 is in bottom, first actuator port H of the first selector valve 11 and the second actuator port F conducting, pilot control is made to flow into guide's hydraulic fluid port E of luffing equilibrium valve 10, thus luffing equilibrium valve 10 reverse-conducting made, the pressure oil of amplitude oil cylinder 1 rodless cavity flows to the first actuator port R of the first cartridge valve by luffing equilibrium valve 10.
Electromagnet 1Y is energized, then the second selector valve 13 is in left position, and the control port U of cartridge valve 12 is without pressure oil, and the first cartridge valve 12 will be opened thus, and the first actuator port R of the first cartridge valve 12 is communicated with the first actuator port C of luffing equilibrium valve 10.Thus, the first hydraulic power unit 2 and amplitude oil cylinder 1 form path, to reclaim the gravitational potential energy that in shear leg luffing dropping process, lift heavy and shear leg produce.
The hydraulic energy that amplitude oil cylinder 1 produces, promote the first hydraulic power unit 2 and rotate, the hydraulic energy that amplitude oil cylinder 1 produces by the first hydraulic power unit 2 will be converted to the mechanical energy of transmission shaft.
The mechanical energy of transmission shaft drives main pump 6, transfer case 3, second hydraulic power unit 4 rotates, thus makes the mechanical energy of transmission shaft convert the rotation function of the second hydraulic power unit 4 to.
Second hydraulic power unit 4 will rotate, thus is squeezed into by hydraulic oil in accumulator 5, namely completes the conversion of mechanical energy to hydraulic energy, finally realizes the recovery of luffing energy.
Accumulator 5, for storing hydraulic energy.
In the above embodiment of the present invention, carry out the recovery of energy for changing-breadth system, what mainly adopt is the locking that equilibrium valve carries out amplitude oil cylinder.
In one embodiment of the invention, switch valve can be adopted to substitute luffing equilibrium valve locking is carried out to oil cylinder, the effect of luffing energy recovery and reuse can be reached equally.
In one embodiment of the invention, switch valve can be adopted to substitute the first cartridge valve locking is carried out to the first hydraulic power unit, the effect of luffing energy recovery and reuse can be reached equally.
In one embodiment of the invention, when luffing falls, first actuator port R of the first cartridge valve can be communicated with the second actuator port D of luffing equilibrium valve 10, that is, the first actuator port R of the first cartridge valve can be connected to the oil circuit between equilibrium valve and amplitude oil cylinder rodless cavity.So, the effect of luffing energy recovery and reuse can be reached equally.
In one embodiment of the invention, described system also comprises the first discharge capacity adjustment module, wherein:
First discharge capacity adjustment module, in the whole luffing dropping process of shear leg, adjusts the discharge capacity of the first hydraulic power unit 2, to control the luffing rate of descent of shear leg, thus prevents luffing from hurtling down.
In the above embodiment of the present invention, in weight decline process, variable displacement pump is adopted to regulate weight rate of descent, instead of the mode of current equilibrium valve speed governing, namely volumetric speed control is adopted to replace throttle grverning, reduce the heating value of system, extend the working life of hydraulic element, and hoist radiation system power can be reduced.
In one embodiment of the invention, in hoist working procedure, crane controller is according to the angle of crane control handle, output current signal controls the discharge capacity of the first hydraulic power unit 2, and then control luffing rate of descent, and then calculate the first hydraulic power unit 2 and export to the moment of torsion of transfer case axle i.e. callable energy torque T
h.
Fig. 2 is the schematic diagram of crane amplitude variation energy regenerating of the present invention and another embodiment of reutilization system.Compared with above-described embodiment, in embodiment illustrated in fig. 2, described system can also comprise the first moment acquisition module 201, second moment acquisition module 202, first identification module 203, second discharge capacity adjustment module 204 and the first switch 17 as shown in Figure 1 and second switch 18, wherein:
First moment acquisition module 201 is connected with the first hydraulic power unit 2 in Fig. 1, and the second moment acquisition device 202 is connected with the second hydraulic power unit 4.
As shown in Figure 1, the first switch 17 is arranged between the second hydraulic power unit 4 and transfer case 3, and second switch is arranged between motor 7 and transfer case 3.
First moment acquisition module 201, in shear leg luffing dropping process, the load torque T of transfer case 3 exported to by Real-time Obtaining first hydraulic power unit 2
h.
In one embodiment of the invention, the first moment acquisition module 201 can obtain described load torque T by the measured value of the discharge capacity and the first pressure transducer 82 that obtain the first hydraulic power unit 2
h.
Second moment acquisition module 202, for obtaining the maximum recovery torque T of the second hydraulic power unit 4
xmax.
In one embodiment of the invention, the second moment acquisition module 202 can obtain described maximum recovery torque T by the pressure obtaining the accumulator that the maximum pump discharge of the second hydraulic power unit 4 and the second pressure transducer 81 detect
xmax.
First identification module 203, for judging T
xmaxwhether be less than T
h.
Second discharge capacity adjustment module 204, for the judged result according to the first identification module 203, at T
xmaxbe less than T
htime, the discharge capacity of the second hydraulic power unit 4 is adjusted to maximum, makes the recovery torque T of the second hydraulic power unit 4
x=T
xmax, and trigger the first switch 17 and second switch 18 closes, pass through T
xcommon equilibrium T is carried out with the braking moment of motor 7
h.That is, the second hydraulic power unit 4 can only the mechanical energy (i.e. the luffing energy of partially recycled jib lubbing mechanism) of partially recycled first hydraulic power unit 2.
In one embodiment of the invention, the second discharge capacity adjustment module 204 also for the judged result according to the first identification module 203, at T
xmaxbe not less than T
htime, the recovery torque T of the second hydraulic power unit 4 is made by the discharge capacity adjusting the second hydraulic power unit 4
x=T
h, trigger that the first switch is closed, second switch disconnects simultaneously, rely on pass through T completely
xbalance T
h.That is, the second hydraulic power unit 4 all can reclaim the mechanical energy (namely all reclaiming the luffing energy of jib lubbing mechanism) of the first hydraulic power unit 2.
In one embodiment of the invention, the first switch 17 and second switch 18 all can adopt clutch.
In one embodiment of the invention, as shown in Figure 1, described system also comprises the first pressure transducer 81, wherein:
First pressure transducer 81 is connected with accumulator 5, for detecting the pressure of accumulator 5;
When the pressure of the first switch 17 also for detecting at the first pressure transducer 81 reaching predetermined maximum service pressure, disconnecting the second hydraulic power unit 4 and the connection of transfer case 3, relying on motor 7 braking moment to balance T completely
h.
In the above embodiment of the present invention, along with the weight-drop that hoists, the carrying out of energy regenerating, the pressure of accumulator constantly increases, when the pressure of accumulator reaches the maximum service pressure of accumulator setting, disconnect the second hydraulic power unit 4 and the connection of transfer case 3, rely on motor 7 braking moment to balance T completely
h.
In one embodiment of the invention, as shown in Figure 1, described system also comprises the 3rd selector valve 15 and the second cartridge valve 16, wherein:
First actuator port X of the 3rd selector valve 15 is communicated with oil return circuit, and the second actuator port Y is communicated with the control port U1 of the second cartridge valve 16, and the 3rd actuator port Z is communicated with accumulator 5.
First actuator port V of the second cartridge valve 16 is communicated with accumulator 5, and the second actuator port W is communicated with the second hydraulic power unit 4.
In the process that crane boom luffing falls, electromagnet 3Y obtains electric, 3rd selector valve 15 is in left position, the control port U1 of the second cartridge valve 16 is without pressure oil, first actuator port V of the second cartridge valve 16 and the second actuator port W conducting, accumulator 5 is communicated with the second hydraulic power unit 4, realizes the recovery of luffing energy.
When the pressure that the first pressure transducer 81 detects reaches predetermined maximum service pressure, electromagnet 3Y power-off, 3rd selector valve 15 is in right position, the control port U1 of the second cartridge valve 16 has pressure oil, first actuator port V and the second actuator port W of the second cartridge valve 16 disconnect, accumulator 5 and the second hydraulic power unit 4 disconnect, and rely on motor 7 braking moment to balance T completely
h.
In one embodiment of the invention, switch valve can be adopted to substitute the second cartridge valve locking is carried out to accumulator, the effect of luffing energy recovery and reuse can be reached equally.
In one embodiment of the invention, as shown in Figure 1, described system also comprises the relief valve 19 be communicated with accumulator 5, wherein:
Relief valve 19, when the pressure detected for the first pressure transducer 81 reaches predetermined maximum service pressure (that is, when the accumulator fills up), open, make the pressure that accumulator keeps constant, energy regenerating stops.
In one embodiment of the invention, when accumulator 5 also has a dump energy for carry out at hoist getting on the bus operation and accumulator, the hydraulic energy that release stores, for the hydraulic actuator of hoist provides driving force.
In one embodiment of the invention, described hydraulic actuator can comprise at least one in the hydraulic actuators such as amplitude oil cylinder, hoist motor, rotary motor.
In one embodiment of the invention, when the luffing of shear leg hoists, electromagnet 3Y, 5Y are energized, and form open model pump control cylinder loop, realize the driving to changing-breadth system by main pump and amplitude oil cylinder.
Specifically, electromagnet 3Y obtains electric, 3rd selector valve 15 is in left position, the control port U1 of the second cartridge valve 16 is without pressure oil, first actuator port V of the second cartridge valve 16 and the second actuator port W conducting, accumulator 5 is communicated with the second hydraulic power unit 4, and accumulator 5 mesohigh oil drives the second hydraulic power unit 4 to rotate by the second cartridge valve 16.
Second hydraulic power unit 4 drives transfer case to rotate by the first switch 1, thus mechanical energy is passed to main drive shaft, provides driving force together with motor to main drive shaft, thus realizes the recycling of the hydraulic energy stored.
Electromagnet 5Y obtains electric, and main reversing valve 9 is in left position, the first actuator port P of the main reversing valve of main reversing valve and the second actuator port A conducting.Main pump 6 also for the mechanical energy of main drive shaft is converted to hydraulic energy, hoists with the luffing driving amplitude oil cylinder 1 to realize shear leg.Now the hoisting of amplitude oil cylinder, is undertaken providing hydraulic oil by main pump or pump/motor.
In one embodiment of the invention, described system also comprises the 3rd discharge capacity adjustment module, wherein:
3rd discharge capacity adjustment module, for hoisting in process at shear leg luffing, the discharge capacity of adjustment main pump 6, to control luffing lifting velocity.
In one embodiment of the invention, in hoist working procedure, crane controller is according to the angle of crane control handle, and output current signal controls main pump delivery, and then the speed that control luffing rises, and then obtains the output torque T of main pump
d.
Fig. 3 is the schematic diagram of crane amplitude variation energy regenerating of the present invention and the another embodiment of reutilization system.Compared with above-described embodiment, in embodiment illustrated in fig. 3, described system can also comprise the 3rd moment acquisition module 301, the 4th moment acquisition module 302, second identification module 303, wherein:
3rd moment acquisition device 301 is communicated with main pump, and the 4th moment acquisition device 302 is communicated with the second hydraulic power unit; Second identification module 303 is communicated with the 4th moment acquisition module with the 3rd moment acquisition module respectively.
3rd moment acquisition module 301, for hoisting in process at shear leg luffing, the load torque T that Real-time Obtaining main pump 6 exports
d.
In one embodiment of the invention, the 3rd moment acquisition module 301 can obtain the load torque T of described main pump 6 output by the acquisition discharge capacity of main pump 6 and the measured value of the 3rd pressure transducer 83
d.
4th moment acquisition module 302, for obtaining the available maximum drive torque T of the second hydraulic power unit 4
xcmax.
In one embodiment of the invention, the second moment acquisition module 202 can obtain described maximum drive torque T by the pressure obtaining the accumulator that the maximum pump discharge of the second hydraulic power unit 4 and the second pressure transducer 81 detect
xcmax.
Second identification module 303, for judging T
xcmaxwhether be less than T
d.
Second discharge capacity adjustment module 204 also for the judged result according to the second identification module 303, at T
xcmaxbe less than T
dtime, the discharge capacity of the second hydraulic power unit 4 is transferred to maximum, makes the driving torque T that the second hydraulic power unit 4 provides
xc=T
xcmax; Trigger the first switch and second switch closes, by the driving torque T of the second hydraulic power unit 4 simultaneously
xccommon Host actuating pump 6 is carried out with the driving moment of motor 7.
In one embodiment of the invention, the second discharge capacity adjustment module 204 also for the judged result according to the second identification module 303, at T
xcmaxbe not less than T
dtime, the driving torque T that the discharge capacity adjusting the second hydraulic power unit 4 makes the second hydraulic power unit 4 provide
xc=T
d; Trigger that the first switch is closed, second switch disconnects simultaneously.That is, the second hydraulic power unit is relied on to carry out Host actuating pump completely.
In one embodiment of the invention, when the pressure of the first switch also for detecting at the first pressure transducer 81 reaches predetermined Minimum operating pressure, disconnect being communicated with of the second hydraulic power unit 4 and transfer case 3, simultaneously closed second switch, rely on motor 7 Host actuating pump 6 completely.
In one embodiment of the invention, along with hoisting, weight rises, high-voltage oil liquid in accumulator is released, the pressure of accumulator constantly reduces, as inflation 1MPa higher than accumulator of the pressure of accumulator, by the displacement control signal zero setting of the second hydraulic power unit, electromagnet 3Y power-off, second cartridge valve 16 disconnects, and the first switch 17 disconnects, and relies on motor to provide power completely.
According to a further aspect in the invention, provide a kind of hoist, comprise the crane amplitude variation energy regenerating described in above-mentioned any one embodiment and reutilization system.
Based on the hoist that the above embodiment of the present invention provides, can the energy of effectively reclaiming crane luffing operation lift heavy and shear leg decline process, then recycled, reduced hoisting operation fuel consume, energy-saving and emission-reduction.The present invention is in luffing decline process, adopt and regulate luffing rate of descent to the mode of accumulator topping up, instead of the mode of current employing equilibrium valve speed governing, reduce the heating value of system, extend the working life of hydraulic element, and hoist radiation system power can be reduced.
Fig. 4 is the schematic diagram of crane amplitude variation energy regenerating of the present invention and a reuse method embodiment.Preferably, the present embodiment can be performed by crane amplitude variation energy regenerating of the present invention and reutilization system.The method comprises the following steps:
Step 401, the gravitational potential energy that lift heavy in crane boom luffing dropping process and shear leg produce is converted to hydraulic energy by amplitude oil cylinder 1.
Step 402, the hydraulic energy that amplitude oil cylinder 1 produces is converted to the mechanical energy of main drive shaft by the first hydraulic power unit 2, wherein the first hydraulic power unit 2 and main pump 6 coaxial communication.
Step 403, main drive shaft drives the second hydraulic power unit 4 to rotate by transfer case 3, and wherein transfer case 3 is communicated with on motor 7 output shaft, and motor 7 is in parallel with the second hydraulic power unit 4 by transfer case 3.
Step 404, accumulator 5 topping up given by the second hydraulic power unit 4, converts the mechanical energy of the second hydraulic power unit 4 to hydraulic energy and stores.
The crane amplitude variation energy regenerating provided based on the above embodiment of the present invention and reuse method, can the energy of effectively reclaiming crane luffing operation lift heavy and shear leg decline process, then recycled, reduced hoisting operation fuel consume, energy-saving and emission-reduction.The present invention is in luffing decline process, adopt and regulate luffing rate of descent to the mode of accumulator topping up, instead of the mode of current employing equilibrium valve speed governing, reduce the heating value of system, extend the working life of hydraulic element, and hoist radiation system power can be reduced.
In one embodiment of the invention, described method can also comprise: in shear leg luffing dropping process, adjusts the discharge capacity of the first hydraulic power unit 2, to control the luffing rate of descent of shear leg.
In the above embodiment of the present invention, in weight decline process, variable displacement pump is adopted to regulate weight rate of descent, instead of the mode of current equilibrium valve speed governing, namely volumetric speed control is adopted to replace throttle grverning, reduce the heating value of system, extend the working life of hydraulic element, and hoist radiation system power can be reduced.
Fig. 5 is the schematic diagram of crane amplitude variation energy regenerating of the present invention and another embodiment of reuse method.Before the step 402 shown in Fig. 4, described method can also comprise:
Step 501, in crane boom luffing dropping process, the load torque T of transfer case 3 exported to by Real-time Obtaining first hydraulic power unit 2
h.
Step 502, obtains the maximum recovery torque T of the second hydraulic power unit 4
xmax.
Step 503, judges T
xmaxwhether be less than T
h.If T
xmaxbe less than T
h, then step 504 is performed; Otherwise, if T
xmaxbe not less than T
h, then step 505 is performed.
Step 504, adjusts to maximum by the discharge capacity of the second hydraulic power unit 4, makes the recovery torque T of the second hydraulic power unit 4
x=T
xmax, pass through T
xcommon equilibrium T is carried out with motor 7 braking moment
h, no longer perform other step of the present embodiment afterwards.That is, in this case, the present invention can only the mechanical energy (i.e. the luffing energy of partially recycled jib lubbing mechanism) of partially recycled first hydraulic power unit 2.
Step 505, makes the recovery torque T of the second hydraulic power unit 4 by the discharge capacity adjusting the second hydraulic power unit 4
x=T
h.That is, in this case, the present invention all can reclaim the mechanical energy (namely all reclaiming the luffing energy of jib lubbing mechanism) of the first hydraulic power unit 2.
In one embodiment of the invention, described method can also comprise: when the pressure of accumulator 5 reaches predetermined maximum service pressure, disconnects being communicated with of the second hydraulic power unit 4 and transfer case 3, relies on motor 7 braking moment to balance T completely
h.
In the above embodiment of the present invention, along with the weight-drop that hoists, the carrying out of energy regenerating, the pressure of accumulator constantly increases, when the pressure of accumulator reaches the maximum service pressure of accumulator setting, disconnect the second hydraulic power unit 4 and the connection of transfer case 3, rely on motor 7 braking moment to balance T completely
h.
In one embodiment of the invention, described method also comprises: when hoist carries out getting on the bus operation, accumulator 5 discharges the hydraulic energy stored, for the hydraulic actuator of hoist provides driving force.
In one embodiment of the invention, described hydraulic actuator can comprise at least one in the hydraulic actuators such as amplitude oil cylinder, hoist motor, rotary motor.
Fig. 6 is the schematic diagram of crane amplitude variation energy regenerating of the present invention and the another embodiment of reuse method.Described when crane operates, the step that accumulator 5 discharges the hydraulic energy stored comprises:
Step 601, when crane boom luffing hoists and accumulator has a dump energy, the hydraulic energy that accumulator 5 discharges is converted to the mechanical energy of main drive shaft by the second hydraulic power unit 4;
Step 602, the mechanical energy of main drive shaft is converted to hydraulic energy by main pump 6, hoists with the luffing driving amplitude oil cylinder 1 to realize shear leg.
In one embodiment of the invention, described method also comprises: hoist in process at shear leg luffing, and the discharge capacity of adjustment main pump 6, to control luffing lifting velocity.
Fig. 7 is the schematic diagram of crane amplitude variation energy regenerating of the present invention and the another embodiment of reuse method.Before the hydraulic energy that accumulator 5 discharges being converted at the second hydraulic power unit 4 shown in Fig. 6 the step of the mechanical energy of main drive shaft, described method can also comprise:
Step 701, when crane boom luffing hoists, the load torque T that Real-time Obtaining main pump 6 exports
d.
Step 702, obtains the available maximum drive torque T of the second hydraulic power unit 4
xcmax.
Step 703, judges T
xcmaxwhether be less than T
d.If T
xcmaxbe less than T
d, then step 704 is performed; Otherwise, if T
xcmaxbe not less than T
d, then step 705 is performed.
Step 704, if T
xcmaxbe less than T
d, then the discharge capacity of the second hydraulic power unit 4 is transferred to maximum, makes the driving torque T that the second hydraulic power unit 4 provides
xc=T
xcmax; Trigger the first switch and second switch closes, by the driving torque 4T of the second hydraulic power unit simultaneously
xccommon Host actuating pump 6 is carried out with the driving moment of motor 7.
Step 705, in one embodiment of the invention, described method also comprises: if T
xcmaxbe not less than T
d, then adjust the discharge capacity of the second hydraulic power unit 4, make the driving torque T that the second hydraulic power unit 4 provides
xc=T
d; Trigger that the first switch is closed, second switch disconnects simultaneously.That is, the second hydraulic power unit is relied on to carry out Host actuating pump completely.
In one embodiment of the invention, after the step 601 shown in Fig. 6, described method can also comprise: when the pressure of accumulator 5 reaches predetermined Minimum operating pressure, disconnects being communicated with of the second hydraulic power unit 4 and transfer case 3, relies on motor 7 Host actuating pump 6 completely.
In one embodiment of the invention, along with hoisting, weight rises, high-voltage oil liquid in accumulator is released, the pressure of accumulator constantly reduces, as inflation 1MPa higher than accumulator of the pressure of accumulator, by the displacement control signal zero setting of the second hydraulic power unit, electromagnet 3Y power-off, second cartridge valve 16 disconnects, and the first switch 17 disconnects, and relies on motor to provide power completely.
At the first moment acquisition module 201 described above, second moment acquisition module 202, first identification module 203, second discharge capacity adjustment module 204, 3rd moment acquisition module 301, 4th moment acquisition module 302, second functional unit such as identification module 303 grade is embodied as the general processor for performing function described by the application, programmable logic controller (PLC) (PLC), DSP digital signal processor (DSP), specific integrated circuit (ASIC), field programmable gate array (FPGA) or other PLDs, discrete gate or transistor logic, discrete hardware components or it is appropriately combined arbitrarily.
Can be realized by crane controller in the function of the functional units such as the first moment acquisition module 201, second moment acquisition module 202, first identification module 203, second discharge capacity adjustment module 204 described above, the 3rd moment acquisition module 301, the 4th moment acquisition module 302, second identification module 303.
So far, the present invention is described in detail.In order to avoid covering design of the present invention, details more known in the field are not described.Those skilled in the art, according to description above, can understand how to implement technological scheme disclosed herein completely.
One of ordinary skill in the art will appreciate that all or part of step realizing above-described embodiment can have been come by hardware, the hardware that also can carry out instruction relevant by program completes, described program can be stored in a kind of computer-readable recording medium, the above-mentioned storage medium mentioned can be ROM (read-only memory), disk or CD etc.
Claims (23)
1. crane amplitude variation energy regenerating and a reuse method, is characterized in that, comprising:
The gravitational potential energy produced in crane boom luffing dropping process is converted to hydraulic energy by amplitude oil cylinder;
The hydraulic energy that amplitude oil cylinder produces is converted to the mechanical energy of main drive shaft by the first hydraulic power unit, wherein the first hydraulic power unit and main pump coaxial communication;
Main drive shaft drives the second hydraulic power unit to rotate by transfer case, and wherein transfer case is communicated with on engine output shaft, and motor is in parallel with the second hydraulic power unit by transfer case;
Second hydraulic power unit, to accumulator topping up, converts the mechanical energy of the second hydraulic power unit to hydraulic energy and stores.
2. method according to claim 1, is characterized in that, also comprises:
In shear leg luffing dropping process, adjust the discharge capacity of the first hydraulic power unit, to control the luffing rate of descent of shear leg.
3. method according to claim 1, is characterized in that, to be driven before the second hydraulic power unit carries out the step rotated by transfer case at main drive shaft, described method also comprises:
The load torque T of transfer case exported to by Real-time Obtaining first hydraulic power unit
h;
Obtain the maximum recovery torque T of the second hydraulic power unit
xmax;
Judge T
xmaxwhether be less than T
h;
If T
xmaxbe less than T
h, then the discharge capacity of the second hydraulic power unit is adjusted to maximum, makes the recovery torque T of the second hydraulic power unit
x=T
xmax, pass through T
xcommon equilibrium T is carried out with engine braking moment
h.
4. method according to claim 3, is characterized in that, also comprises:
If T
xmaxbe not less than T
h, then the recovery torque T of the second hydraulic power unit is made by the discharge capacity of adjustment second hydraulic power unit
x=T
h.
5. the method according to any one of claim 1-4, is characterized in that, after the second hydraulic power unit is to the step of accumulator topping up, also comprises:
When the pressure of accumulator reaches predetermined maximum service pressure, disconnect being communicated with of the second hydraulic power unit and transfer case, rely on engine braking moment to balance T completely
h.
6. method according to claim 1, is characterized in that, also comprises:
When hoist carries out getting on the bus operation, the hydraulic energy that accumulator release stores, for hoist provides driving force.
7. method according to claim 6, is characterized in that, when crane operates, the step of the hydraulic energy that accumulator release stores comprises:
When crane boom luffing hoists, the hydraulic energy that accumulator discharges is converted to the mechanical energy of main drive shaft by the second hydraulic power unit;
The mechanical energy of main drive shaft is converted to hydraulic energy by main pump, hoists with the luffing driving amplitude oil cylinder to realize shear leg.
8. method according to claim 7, is characterized in that, also comprises:
Hoist in process at shear leg luffing, adjust main pump delivery, to control luffing lifting velocity.
9. method according to claim 7, is characterized in that, before the hydraulic energy that accumulator discharges being converted at the second hydraulic power unit the step of the mechanical energy of main drive shaft, also comprises:
The load torque T that Real-time Obtaining main pump exports
d;
Obtain the available maximum drive torque T of the second hydraulic power unit
xcmax;
Judge T
xcmaxwhether be less than T
d;
If T
xcmaxbe less than T
d, then the discharge capacity of the second hydraulic power unit is transferred to maximum, makes the driving torque T that the second hydraulic power unit provides
xc=T
xcmax, pass through T
xccommon Host actuating pump is carried out with engine driving torque.
10. method according to claim 9, is characterized in that, also comprises:
If T
xcmaxbe not less than T
d, then adjust the discharge capacity of the second hydraulic power unit, make the driving torque T that the second hydraulic power unit provides
xc=T
d.
11. methods according to any one of claim 7-10, is characterized in that, after the hydraulic energy that accumulator discharges being converted at the second hydraulic power unit the step of the mechanical energy of main drive shaft, also comprise:
When the pressure of accumulator reaches predetermined Minimum operating pressure, disconnect being communicated with of the second hydraulic power unit and transfer case, rely on engine-driving main pump completely.
12. 1 kinds of crane amplitude variation energy regenerating and reutilization system, it is characterized in that, comprise: amplitude oil cylinder, the first hydraulic power unit, transfer case, the second hydraulic power unit and accumulator, wherein the first hydraulic power unit and main pump coaxial communication, transfer case is communicated with on engine output shaft, motor is in parallel with the second hydraulic power unit by transfer case, wherein:
Amplitude oil cylinder, for being converted to hydraulic energy by the gravitational potential energy produced in crane boom luffing dropping process;
First hydraulic power unit, the hydraulic energy for amplitude oil cylinder being produced is converted to the mechanical energy of main drive shaft;
Transfer case, for driving the second hydraulic power unit to rotate by the mechanical energy of main drive shaft;
Second hydraulic power unit, for by accumulator topping up, converts the mechanical energy of the second hydraulic power unit to hydraulic energy and stores;
Accumulator, for storing hydraulic energy.
13. systems according to claim 12, is characterized in that, also comprise the first discharge capacity adjustment module, wherein:
First discharge capacity adjustment module, in shear leg luffing dropping process, adjusts the discharge capacity of the first hydraulic power unit, to control the luffing rate of descent of shear leg.
14. systems according to claim 12, is characterized in that, also comprise the first moment acquisition module, the second moment acquisition module, the first identification module and the second discharge capacity adjustment module, wherein:
First moment acquisition module, exports to the load torque T of transfer case for Real-time Obtaining first hydraulic power unit
h;
Second moment acquisition module, for obtaining the maximum recovery torque T of the second hydraulic power unit
xmax;
First identification module, for judging T
xmaxwhether be less than T
h;
Second discharge capacity adjustment module, for the judged result according to the first identification module, at T
xmaxbe less than T
htime, the discharge capacity of the second hydraulic power unit is adjusted to maximum, makes the recovery torque T of the second hydraulic power unit
x=T
xmax, pass through T
xcommon equilibrium T is carried out with engine braking moment
h.
15. systems according to claim 14, is characterized in that,
Second discharge capacity adjustment module also for the judged result according to the first identification module, at T
xmaxbe not less than T
htime, the recovery torque T of the second hydraulic power unit is made by the discharge capacity adjusting the second hydraulic power unit
x=T
h.
16. systems according to any one of claim 12-15, is characterized in that, also comprise the first pressure transducer and the first switch, wherein:
First pressure transducer, for detecting the pressure of accumulator;
First switch, when the pressure for detecting at the first pressure transducer reaches predetermined maximum service pressure, disconnects being communicated with of the second hydraulic power unit and transfer case, and dependence engine braking moment balances T completely
h.
17. systems according to claim 16, is characterized in that,
When accumulator is also for carrying out at hoist getting on the bus operation, the hydraulic energy that release stores, for hoist provides driving force.
18. systems according to claim 17, is characterized in that,
The hydraulic energy that accumulator discharges, also for when crane boom luffing hoists, is converted to the mechanical energy of main drive shaft by the second hydraulic power unit;
Main pump also for the mechanical energy of main drive shaft is converted to hydraulic energy, hoists with the luffing driving amplitude oil cylinder to realize shear leg.
19. systems according to claim 18, is characterized in that, also comprise the 3rd discharge capacity adjustment module, wherein:
3rd discharge capacity adjustment module, for hoisting in process at shear leg luffing, adjusts main pump delivery, to control luffing lifting velocity.
20. systems according to claim 18, is characterized in that, also comprise the 3rd moment acquisition module, the 4th moment acquisition module, the second identification module, wherein:
3rd moment acquisition module, for the load torque T that Real-time Obtaining main pump exports
d;
4th moment acquisition module, for obtaining the available maximum drive torque T of the second hydraulic power unit
xcmax;
Second identification module, for judging T
xcmaxwhether be less than T
d;
Second discharge capacity adjustment module also for the judged result according to the second identification module, at T
xcmaxbe less than T
dtime, the discharge capacity of the second hydraulic power unit is transferred to maximum, makes the driving torque T that the second hydraulic power unit provides
xc=T
xcmax, pass through T
xccommon Host actuating pump is carried out with engine driving torque.
21. systems according to claim 20, is characterized in that,
Second discharge capacity adjustment module also for the judged result according to the second identification module, at T
xcmaxbe not less than T
dtime, adjust the discharge capacity of the second hydraulic power unit, make the driving torque T that the second hydraulic power unit provides
xc=T
d.
22. systems according to claim 18, is characterized in that,
When the pressure of the first switch also for detecting at the first pressure transducer reaches predetermined Minimum operating pressure, disconnect being communicated with of the second hydraulic power unit and transfer case, completely dependence engine-driving main pump.
23. 1 kinds of hoists, is characterized in that, comprise as the crane amplitude variation energy regenerating in claim 12 to 22 as described in any one and reutilization system.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410680034.XA CN105156412B (en) | 2014-11-24 | 2014-11-24 | Crane amplitude variation energy regenerating and reuse method and system and crane |
| EP15862593.9A EP3225855B1 (en) | 2014-11-24 | 2015-01-19 | Method and system for recovering and utilizing duty energy of crane, and crane |
| PCT/CN2015/070962 WO2016082321A1 (en) | 2014-11-24 | 2015-01-19 | Method and system for recovering and utilizing duty energy of crane, and crane |
| US15/528,649 US10359063B2 (en) | 2014-11-24 | 2015-01-19 | Method and system for recovering and utilizing operating energy of crane, and crane |
| BR112017010895A BR112017010895A2 (en) | 2014-11-24 | 2015-01-19 | method and system for recovering and utilizing crane, and crane operating energy |
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| CN201410680034.XA CN105156412B (en) | 2014-11-24 | 2014-11-24 | Crane amplitude variation energy regenerating and reuse method and system and crane |
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| CN105156412B (en) | 2017-08-08 |
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