CN105697429A - Energy recovery control system and lifting equipment - Google Patents
Energy recovery control system and lifting equipment Download PDFInfo
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- CN105697429A CN105697429A CN201510969463.3A CN201510969463A CN105697429A CN 105697429 A CN105697429 A CN 105697429A CN 201510969463 A CN201510969463 A CN 201510969463A CN 105697429 A CN105697429 A CN 105697429A
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- main valve
- fluid port
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/20—Means for actuating or controlling masts, platforms, or forks
- B66F9/22—Hydraulic devices or systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
- F15B19/005—Fault detection or monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/14—Energy-recuperation means
Abstract
The invention discloses an energy recovery control system and lifting equipment. The energy recovery control system comprises a hydraulic pump, a main valve, a hydraulic execution element, an energy accumulator, a first control valve and a second control valve; the main valve has a first main valve pressure oil port, a second main valve pressure oil port, a main valve working oil port and a main valve oil discharge port; the hydraulic execution element has an execution element working oil port; an outlet of the hydraulic pump is connected with the first main valve pressure oil port; the main valve working oil port is connected with the execution element working oil port; the execution element working oil port is connected with the energy accumulator through the first control valve; the first control valve controls the connection and the disconnection of the actuation element working oil port and the energy accumulator; the energy accumulator and the second main valve pressure oil port are connected through the second control valve; and the second control valve controls the connection and the disconnection of the energy accumulator and the second main valve pressure oil port. The energy recovery control system can directly act the energy, absorbed by the energy accumulator, on the main valve when being applied to the lifting equipment, and is wider in application range.
Description
Technical field
The present invention relates to engineering machinery field, particularly to a kind of energy recovery control system and crane gear。
Background technology
Fork truck is widely used in workshop, warehouse etc. and environmental condition is required higher occasion, its structure and work characteristics determine when pallet fork proposes weight rising, needing elevating ram to provide it driving force, namely hydraulic cylinder provides energy, is gravitional force by hydraulic energy transfer；And when pallet fork proposes weight decline, its potential energy is discharged。This potential energy is considerable relative to the fork truck of frequent operation, as can not be effectively utilized, not only causes energy dissipation, also will cause the rising of hydraulic fluid temperature, influential system service behaviour。Therefore designing energy storage device in its hydraulic system, the potential energy discharged in goods decline process is stored, and be used in the next working cycle, it is necessary for putting forward high-octane utilization ratio。
Energy recycle device of the prior art mainly has two kinds, and one is to utilize electric energy to carry out energy regenerating, and another kind utilizes hydraulic energy to carry out energy regenerating。Wherein, electric energy is utilized to carry out the energy recovery control system schematic diagram of energy regenerating as shown in Figure 1, under the effect of load gravity, the piston of hydraulic cylinder 18 moves downward, the hydraulic oil of hydraulic cylinder 18 rodless cavity arrives the oil-in of pump motor 13 through the right position of 2/2-way electromagnetic valve 17, and driving pump motor 13 rotates, and pump motor 13 drive motor 11 generates electricity, energy accumulating device such as battery or ultracapacitor etc. are charged by motor 11 by inverter 12, it is achieved energy regenerating。Wherein, 2/2-way electromagnetic valve 17 is switch valve, does not play speed governing effect, so the decrease speed of weight is uncontrollable。
Fig. 2 show the energy recovery control system schematic diagram utilizing hydraulic energy to carry out energy regenerating。As shown in Figure 2, hydraulic energy reclaims mainly by accumulator 24, during lifting operation, handle the lifting sheet handle of banked direction control valves 27, valve stem depressions switch K2, reversal valve 26 obtains electric commutation turn-on accumulator 24 and the entrance oil circuit of hydraulic pump 23, thus the inlet and outlet pressure decreasing pump is poor, reduces motor 21 and drives the power demand of pump；During decline operation, handling the lifting sheet handle of banked direction control valves 27, valve stem depressions switch K1, reversal valve 29 obtains electric and commutates, and the pressure in hydraulic cylinder 28 enters accumulator 24 and stores。
The energy recovery control system that hydraulic energy carries out energy regenerating that utilizes of prior art has the disadvantage in that
1, when hydraulic energy is carried out energy regenerating, hydraulic oil is introduced pumping hydraulic fluid port by energy recovery control system, is not suitable for common gear pump, and general gear pump inlet port normal pressure requires not can exceed that 1MPa, and specific pump structure will make cost increase, be unfavorable for popularization and application。
2, the energy recovery control system that the lifting class crane gear of prior art adopts is mainly for the equipment of electrical energy drive, and large-tonnage lifting equipment adopt be typically all internal combustion engine, power of IC engine is big, and it is also big for meeting rate request hydraulic pressure pump delivery, accumulator should not introduce the oil-in of hydraulic pump, and therefore the energy recovery control system range of application of above prior art is limited。
3, the control valve controlling energy regenerating is switch valve, cannot decrease speed be controlled after switching, and owing to working connection and energy absorption loop exist pressure reduction during switching, can produce to impact。
4, not having pressure detecting in decline absorption process, when energy storage pressure and the big cavity pressure of elevating ram are essentially identical, weight will be stagnated。
Summary of the invention
It is an object of the invention to provide a kind of energy recovery control system and crane gear, it is intended to propose a kind of energy recovery control system, solve the problem that the range of application of the energy recovery control system existence of prior art is limited。Further, the problem also solving uncontrollable weight decrease speed。
To achieve these goals, first aspect present invention provides a kind of energy recovery control system, including hydraulic pump, main valve, hydraulic actuator and accumulator, main valve has the first main valve pressure oil port, second main valve pressure oil port, main valve actuator port and main valve oil drain out, main valve can control bound actuator port and the first main valve pressure oil port, the break-make of the second main valve pressure oil port and main valve oil drain out, hydraulic actuator has executive component actuator port, hydraulic pressure delivery side of pump and the first main valve pressure oil port connect, main valve actuator port is connected with executive component actuator port, energy recovery control system also includes the first control valve and second and controls valve, executive component actuator port controls valve with accumulator by first and is connected, first controls valve controls the break-make of executive component actuator port and accumulator, accumulator and the second main valve pressure oil port are connected by the second control valve, second controls valve controls the break-make of accumulator and the second main valve pressure oil port。
Further, first controls valve has the first hydraulic fluid port and the second hydraulic fluid port, first the first hydraulic fluid port controlling valve is connected with executive component actuator port, first the second hydraulic fluid port controlling valve is connected with accumulator, first controls valve has the first operating position and the second operating position, in first its first hydraulic fluid port of the first operating position controlling valve and the connection of the second hydraulic fluid port, disconnect at first its first hydraulic fluid port of the second operating position controlling valve and the second hydraulic fluid port。
Further, first controls valve and can control valve port opening when its first hydraulic fluid port and the second hydraulic fluid port connect。
Further, the first control valve is electricity proportional throttle valve。
Further, energy recovery control system also includes the first pressure detecting element and the second pressure detecting element, and the first pressure detecting element is connected with executive component actuator port, and the second pressure detecting element is connected with accumulator。
Further, second controls valve includes the first hydraulic fluid port and the second hydraulic fluid port, second the first hydraulic fluid port controlling valve is connected with accumulator, second the second hydraulic fluid port controlling valve and the second main valve pressure oil port connect, second controls valve has the first operating position and the second operating position, in second its first hydraulic fluid port of the first operating position controlling valve and the connection of the second hydraulic fluid port, disconnect at second its first hydraulic fluid port of the second operating position controlling valve and the second hydraulic fluid port。
Further, energy recovery control system also includes load pressure and compares valve, main valve also includes main valve load feedback mouth, main valve can control the break-make of the first main valve pressure oil port and main valve load feedback mouth, and load pressure compares valve for passing through to compare the accumulator Stress control main valve load feedback mouth with main valve load feedback mouth and connect with oil extraction and disconnect。
Further, load pressure compares valve and includes the first hydraulic fluid port, second hydraulic fluid port, first controls port and second controls port, load pressure compares the first hydraulic fluid port of valve, main valve load feedback mouth and first controls port and is connected to each other, load pressure compares the second hydraulic fluid port of valve and is connected with oil extraction, second controls port is connected with accumulator, load pressure compares valve and has the first operating position and the second operating position, load pressure compare valve by compare accumulator and main valve load feedback mouth Stress control its switch between the first operating position and the second operating position, its first hydraulic fluid port of the first operating position and the connection of the second hydraulic fluid port of valve is compared at load pressure, its first hydraulic fluid port of the second operating position and the disconnection of the second hydraulic fluid port of valve is compared at load pressure。
Further, energy recovery control system also includes check valve, accumulator and the second main valve pressure oil port are connected by the second control valve and check valve, check valve has check valve inlet and one-way valved outlet, and wherein, check valve inlet is connected with accumulator, one-way valved outlet and second controls valve and connects, or, check valve inlet controls valve with second and is connected, and one-way valved outlet and the second main valve pressure oil port connect。
Second aspect present invention provides a kind of crane gear, including the energy recovery control system any one of first aspect present invention。
Based on technical scheme provided by the invention, this energy recovery control system includes hydraulic pump, main valve, hydraulic actuator and accumulator, main valve has the first main valve pressure oil port, second main valve pressure oil port, main valve actuator port and main valve oil drain out, main valve can control bound actuator port and the first main valve pressure oil port, the break-make of the second main valve pressure oil port and main valve oil drain out, hydraulic actuator has executive component actuator port, hydraulic pressure delivery side of pump and the first main valve pressure oil port connect, main valve actuator port is connected with executive component actuator port, energy recovery control system also includes the first control valve and second and controls valve, executive component actuator port controls valve with accumulator by first and is connected, first controls valve controls the break-make of executive component actuator port and accumulator, accumulator and the second main valve pressure oil port are connected by the second control valve, second controls valve controls the break-make of accumulator and the second main valve pressure oil port。The energy of the accumulator storage of this energy recovery control system directly can be acted on main valve by the second main valve pressure oil port, can be used on the lifting equipment that heavy duty drives, pump inlet pressure without impact, to adopting gear pump as hydraulic pump also without restriction, is therefore used wider by cause。Further, when first controls valve port opening when valve can control the connection of its first hydraulic fluid port and the second hydraulic fluid port, it is possible to controlled the oil extraction pressure of executive component by valve port opening, thus the speed of weight decline can also be controlled。
By referring to the accompanying drawing detailed description to the exemplary embodiment of the present invention, the further feature of the present invention and advantage thereof will be made apparent from。
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described 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 premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings。
Fig. 1 is the energy recovery control system principle schematic utilizing electric energy to carry out energy regenerating of the prior art；
Fig. 2 is the energy recovery control system principle schematic utilizing hydraulic energy to carry out energy regenerating of the prior art；
Fig. 3 is the principle schematic of the energy recovery control system of the embodiment of the present invention；
Fig. 4 be the embodiment of the present invention energy-recuperation system in the principle schematic of a concrete example of main valve。
Each accompanying drawing labelling represents respectively:
11-motor；12-inverter；13-pump motor；15-overflow valve；17-2/2-way electromagnetic valve；18-hydraulic cylinder；21-motor；23-hydraulic pump；24-accumulator；26-reversal valve；27-banked direction control valves；28-hydraulic cylinder；29-reversal valve；4-energy recovery control system；421-the first pressure detecting element；422-the second pressure detecting element；43-hydraulic pump；44-accumulator；N-accumulator；46-energy regenerating controls valve；A-recovery valve actuator port；P-recovery valve pressure oil port；E-recovery valve oil-out；N-accumulator；Ls-recovery valve load feedback mouth；T-recovery valve oil drain out；461-first controls valve；A1-first controls the first hydraulic fluid port of valve；A2-first controls the second hydraulic fluid port of valve；462-second controls valve；B1-second controls the first hydraulic fluid port of valve；B2-second controls the first hydraulic fluid port of valve；463-load pressure compares valve；C1-load pressure compares the first hydraulic fluid port of valve；C2-load pressure compares the second hydraulic fluid port of valve；464-check valve；47-main valve；P1-the first main valve pressure oil port；P2-the second main valve pressure oil port；A1-main valve actuator port；LS1-main valve load feedback mouth；T1-main valve oil drain out；48-hydraulic actuator；W-executive component actuator port。
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments。Description only actually at least one exemplary embodiment is illustrative below, never as any restriction to the present invention and application or use。Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention。
Unless specifically stated otherwise, the parts otherwise set forth in these embodiments and positioned opposite, the numerical expression of step and numerical value do not limit the scope of the invention。
Simultaneously, it should be appreciated that for the ease of describing, the size of the various piece shown in accompanying drawing is not draw according to actual proportionate relationship。
The known technology of person of ordinary skill in the relevant, method and apparatus are likely to be not discussed in detail, but in the appropriate case, technology, method and apparatus should be considered to authorize a part for description。
Shown here with in all examples discussed, any occurrence should be construed as merely exemplary, not as restriction。Therefore, other example of exemplary embodiment can have different values。
It should also be noted that similar label and letter below figure represent similar terms, therefore, once a certain Xiang Yi accompanying drawing is defined, then it need not be further discussed in accompanying drawing subsequently。
Fig. 3 illustrates the energy recovery control system of the embodiment of the present invention and the principle schematic of energy regenerating control valve。
As it is shown on figure 3, the energy regenerating of the present embodiment controls valve 46 includes the first control valve 461, second controls valve 462, and has recovery valve actuator port A, recovery valve pressure oil port P, recovery valve oil-out E and accumulator N。Recovery valve pressure oil port P is connected with recovery valve actuator port A。Recovery valve actuator port A is connected with accumulator N by the first control valve 461, and first controls valve 461 controls the break-make of recovery valve actuator port A and accumulator N；Accumulator N is connected with recovery valve oil-out E by the second control valve 462, and second controls valve 462 controls the break-make of accumulator N and recovery valve oil-out E。
First controls valve 461 has the first hydraulic fluid port a1 and the second hydraulic fluid port a2, wherein, first hydraulic fluid port a1 is connected with recovery valve actuator port A, and the second hydraulic fluid port a2 is connected with accumulator N, and first controls valve 461 can control connection and the disconnection of its first hydraulic fluid port a1 and the second hydraulic fluid port a2。
Preferably, first in the present embodiment controls valve 461 and has the first operating position and the second operating position, and when the first operating position, its first hydraulic fluid port a1 and the second hydraulic fluid port a2 connects (the upper working position in Fig. 3)；When the second operating position (the lower working position in Fig. 3), its first hydraulic fluid port a1 and the second hydraulic fluid port a2 disconnects。
As it is shown on figure 3, the energy recovery control system 4 of the present embodiment includes energy regenerating controls valve 46, hydraulic pump 43, main valve 47, hydraulic actuator 48 and accumulator 44。Wherein, main valve 47 has the first main valve pressure oil port P1, second main valve pressure oil port P2, main valve actuator port A1 and main valve oil drain out T1, main valve 47 can the break-make of control bound actuator port A1 and the first main valve pressure oil port P1, the second main valve pressure oil port P2 and main valve oil drain out T1。Hydraulic actuator 48 has executive component actuator port W。The outlet of hydraulic pump 43 is connected with the first main valve pressure oil port P1。Energy regenerating controls the recovery valve pressure oil port P of valve 46 and is connected with main valve actuator port A1。Recovery valve oil-out E and the second main valve pressure oil port P2 connects。Recovery valve actuator port A is connected with executive component actuator port W。Accumulator N is connected with accumulator 44。
Energy recovery control system 4 in above example makes recovery valve oil-out E directly be connected with the second main valve pressure oil port P2 of main valve 47, the energy of accumulator 44 storage directly can be acted on main valve 47 by recovery valve oil-out E, can be used on the lifting equipment that heavy duty drives, because of on pump inlet pressure without impact, to adopting gear pump as hydraulic pump also without restriction, therefore use wider。
Additionally, before energy regenerating in energy recovery control system in above example controls the in-line that valve 46 is connected to actuator actuator port W and the second main valve pressure oil port P2, its first control valve 461 just can control its first hydraulic fluid port a1 and the second hydraulic fluid port a2 in weight decline process and connect thus reclaiming potential energy and being stored in accumulator 44；Second control valve 462 then can control accumulator 44 and release energy in good time。
So that when weight is controlled by the first control valve 461 in decline process, the decrease speed of weight can be effectively controlled, improving the comfort level of operation, in the present embodiment, first controls valve 461 can control valve port opening when its first hydraulic fluid port a1 and the second hydraulic fluid port a2 connects。
Preferably, it is electricity proportional throttle valve that first in the present embodiment controls valve 461, therefore, in weight decline process, have only to the current value by electricity proportional throttle valve and certain slope is set, namely electric current is set according to certain ratio, it is possible to effectively control the decrease speed of weight。
In the present embodiment, second controls valve 462 includes the first hydraulic fluid port b1 and the second hydraulic fluid port b2, and wherein the first hydraulic fluid port b1 is connected with accumulator N, and the second hydraulic fluid port b2 exports E with recovery valve oil-out and is connected。Second controls valve valve 462 has the first operating position and the second operating position, when it is in the first operating position (the lower working position shown in Fig. 3), first hydraulic fluid port b1 and the second hydraulic fluid port b2 connection, when it is in the second operating position (the upper working position shown in Fig. 3), the first hydraulic fluid port b1 and the second hydraulic fluid port b2 disconnects。Second control valve 462 can be such as 2/2-way solenoid directional control valve。
In order to the pressure of detection executive component actuator port W and accumulator N, thus the first control valve 461 and the second control valve 462 are controlled by the pressure according to detection executive component actuator port W and accumulator N, as shown in Figure 3, energy regenerating controls valve 46 and is additionally provided with the first pressure detecting hydraulic fluid port and the second pressure detecting hydraulic fluid port, wherein, first pressure detecting hydraulic fluid port is connected with recovery valve actuator port A, and the second pressure detecting hydraulic fluid port is connected with accumulator N。First pressure detecting element 421 is connected to the first pressure detecting hydraulic fluid port, and therefore, the first pressure detecting element 421 can detect the force value of executive component actuator port W。Second pressure detecting element 422 is connected with the second pressure detecting hydraulic fluid port, and therefore, the second pressure detecting element 422 can detect the force value of accumulator N。
In the present embodiment, the first control valve 461 is electricity proportional throttle valve。If the force value that the first pressure detecting element 421 detects is B1, the force value that second pressure detecting element 422 detects is B2, so in the decline process of weight, if B1 is not more than B2, then illustrate that potential energy cannot be absorbed, electricity proportional throttle valve must not be electric, main valve 47 control the decline of executive component 48。If B1 is more than B2 certain value, then illustrate that potential energy can be absorbed, then main valve 47 does not work, electricity proportional throttle valve obtains electric, electricity proportional throttle valve is made to be in the first operating position, first hydraulic fluid port a1 and the second hydraulic fluid port a2 connection, and valve port is in certain aperture, make the second control valve 462 be in the second operating position simultaneously, first hydraulic fluid port b1 and the second hydraulic fluid port b2 is off, it is achieved is controlled valve 46 by energy regenerating and controls the decline process of executive component 48, namely controls the decline process of weight, now accumulator 44 can absorb energy, is in the energy absorption stage。Can effectively control the decrease speed of weight by controlling the current value of electricity proportional throttle valve in this stage, such as the current value of electricity proportional throttle valve is arranged certain slope, effectively prevent the problem that decrease speed cannot be controlled existed in prior art, improve the comfortableness of operation。
In the energy absorption stage, decline along with weight, potential energy gradates as pressure energy, store gradually to accumulator 44, the pressure of accumulator N is gradually increasing, namely, the force value B2 that second pressure detecting element 422 detects is in continuous increase, when compared with the force value B1 that the first pressure detecting element 421 detects, when the difference of force value B1 and force value B2 narrows down to certain value, for ensureing that weight has enough decrease speeds, at this moment the current value of electricity proportional throttle valve will be gradually reduced, the opening of main valve 47 is gradually increased inversely simultaneously, avoid the decline process of weight occurs stagnation。Furthermore it is also possible to make by electricity proportional throttle valve control the decline of weight be transformed into controlled this process of decline of weight by main valve can smooth transition, it is to avoid impact。
Wherein, owing to the pressure reduction between the first pressure detecting element 421 and the second pressure detecting element 422 is dynamic value, controlling the first control valve 461 according to this dynamic value, absorption efficiency is higher。
To sum up, in whole energy absorption process, owing to have employed electricity proportional throttle valve, utilize its speed-regulating function so that whole speed of operation is controlled, improve the comfortableness of operation。Additionally, the setting of the first pressure detecting element 421 and the second pressure detecting element 422 makes energy recovery control system the pressure of executive component actuator port W and accumulator N can be detected simultaneously and carry out corresponding control according to force value, it is to avoid the decrease speed caused due to energy regenerating is crossed slow or stops。
When accumulator 44 stores enough energy, it is possible to control the second control valve 462 and be in the first operating position so that its first hydraulic fluid port b1 and the second hydraulic fluid port b2 connection。The energy of accumulator 44 storage just directly can be acted on the second main valve pressure oil port P2 by recovery valve oil-out E, provides energy thereby through main valve 47 for executive component 48。
As shown in Figure 3, energy regenerating control valve 46 also includes load pressure and compares valve 463, and energy regenerating controls valve 46 and also has recovery valve load feedback mouth Ls and recovery valve oil drain out T, load pressure compares valve 463 can control connection and the disconnection of recovery valve load feedback mouth Ls and recovery valve oil drain out T by comparing the pressure of accumulator N and recovery valve load feedback mouth Ls。
In the present embodiment, load pressure compares valve 463 and includes the first hydraulic fluid port c1, second hydraulic fluid port c2, first controls port and second controls port, load pressure compares the first hydraulic fluid port c1 of valve 463, recovery valve load feedback mouth Ls and the first controls port and be connected to each other, load pressure compares the second hydraulic fluid port c2 of valve and is connected with recovery valve oil drain out T, and second controls port is connected with accumulator N。
Main valve 47 also includes main valve load feedback mouth Ls1。The main valve load feedback mouth Ls1 of main valve 47 is connected with recovery valve load feedback mouth Ls。Main valve 47 can control the break-make of its first main valve pressure oil port P1 and main valve load feedback mouth Ls1。
Load pressure compares valve 463 and has the first operating position and the second operating position, load pressure compares valve 463 and controls it switch between the first operating position and the second operating position by comparing the pressure (namely pressure of main valve load feedback mouth Ls1) of accumulator N and recovery valve load feedback mouth Ls, when the first operating position (the upper working position in Fig. 3), the first hydraulic fluid port c1 and the second hydraulic fluid port c2 connection；When the second actuator port (the lower working position in Fig. 3), the first hydraulic fluid port c1 and the second hydraulic fluid port c2 disconnects。
Load pressure compares whether valve 463 directly connects with fuel tank for the outlet controlling hydraulic pump 43, thus controlling hydraulic pump 43 whether band load work。When first main valve pressure oil port P1 connects with main valve load feedback mouth Ls1 and main valve load feedback mouth Ls1 connects with oil extraction, hydraulic pump 43 is without load work。
Specifically, in the process of releasing energy, namely during lifting heavy, load pressure compares valve 463 and compares the pressure (namely pressure of main valve load feedback mouth Ls1) of load feedback mouth Ls and the pressure of accumulator N, time in energy absorption process, accumulator 44 has stored enough energy。When needs lifting heavy, due in the present embodiment load pressure compare valve 463 first control port be additionally provided with spring, it is thus desirable to during pressure certain value that the pressure of accumulator N is more than load feedback mouth Ls, load pressure can be made to compare valve 463 and to be in the first operating position, its the first hydraulic fluid port c1 and the second hydraulic fluid port c2 connection, the direct oil return of hydraulic pump 43, no longer loss of energy；Meanwhile, second controls valve 462 is in the first operating position, and the pressure of accumulator 44 directly enters main valve 47 through the second main valve pressure oil port P2, and supply main valve 47 works。
Release along with energy, the pressure of accumulator 44 is gradually lowered, insufficient pressure as accumulator N, when not reaching the pressure certain value more than load feedback mouth Ls, load pressure compares valve 463 will be in the second operating position, and the second control valve 462 will be in the second operating position (upper in Fig. 3) main valve 47 by hydraulic pump 43 fuel feeding simultaneously。
Preferably, energy regenerating controls valve 46 and also includes check valve 464, and check valve 464 has check valve inlet and one-way valved outlet, and check valve inlet is connected with accumulator N, and one-way valved outlet is connected with recovery valve oil-out E。As it is shown on figure 3, in the present embodiment, check valve inlet is connected with accumulator N by the second control valve 462。
Check valve 464 can also be arranged on accumulator N and the second and control between valve 462。
Check valve 464 is possible to prevent the pressure oil of main valve 47 to enter in energy regenerating control valve 46 through the second main valve pressure oil port P2 and recovery valve oil-out E。
Main valve 47 in above example can be any valve with aforementioned structure and function in prior art, for instance structure principle chart valve as shown in Figure 4。
The present invention also proposes a kind of crane gear, including the energy recovery control system in above-described embodiment。This crane gear can be such as fork truck。
In sum, the energy recovery control system of the embodiment of the present invention makes recovery valve oil-out directly be connected with a main valve pressure oil port of main valve, the energy of accumulator storage directly can be acted on main valve by recovery valve oil-out, and can drive in heavy duty, also can utilize ordinary gear oil pump feed, expand the range of application of energy recovery control system。It addition, the adoption rate choke valve in the embodiment of the present invention is controlled, the decrease speed of the weight in energy absorption process is control effectively, improves operating characteristics。
Finally should be noted that: above example is only in order to illustrate that technical scheme is not intended to limit；Although the present invention being described in detail with reference to preferred embodiment, those of ordinary skill in the field are it is understood that still can modify to the specific embodiment of the present invention or portion of techniques feature carries out equivalent replacement；Without deviating from the spirit of technical solution of the present invention, it all should be encompassed in the middle of the technical scheme scope that the present invention is claimed。
Claims (10)
1. an energy recovery control system, including hydraulic pump (43), main valve (47), hydraulic actuator (48) and accumulator (44), described main valve (47) has the first main valve pressure oil port (P1), second main valve pressure oil port (P2), main valve actuator port (A1) and main valve oil drain out (T1), described main valve (47) can control described main valve actuator port (A1) and described first main valve pressure oil port (P1), the break-make of the second main valve pressure oil port (P2) and described main valve oil drain out (T1), described hydraulic actuator (48) has executive component actuator port (W), the outlet of described hydraulic pump (43) is connected with described first main valve pressure oil port (P1), described main valve actuator port (A1) is connected with described executive component actuator port (W), it is characterized in that, described energy recovery control system also includes the first control valve (461) and second and controls valve (462), described executive component actuator port (W) controls valve (461) with described accumulator (44) by described first and is connected, described first controls valve (461) controls the break-make of described executive component actuator port (W) and described accumulator (44), described accumulator (44) controls valve (462) with described second main valve pressure oil port (P2) by described second and is connected, described second controls valve (462) controls the break-make of described accumulator (44) and described second main valve pressure oil port (P2)。
2. energy recovery control system according to claim 1, it is characterized in that, described first controls valve (461) has the first hydraulic fluid port (a1) and the second hydraulic fluid port (a2), described first the first hydraulic fluid port (a1) controlling valve (461) is connected with described executive component actuator port (W), described first the second hydraulic fluid port (a2) controlling valve (461) is connected with described accumulator (44), described first controls valve (461) has the first operating position and the second operating position, connect with the second hydraulic fluid port (a2) at described first its first hydraulic fluid port (a1) of the first operating position controlling valve (461), disconnect with the second hydraulic fluid port (a2) at described first its first hydraulic fluid port (a1) of the second operating position controlling valve (461)。
3. energy recovery control system according to claim 2, it is characterised in that described first controls valve (461) can control valve port opening when its first hydraulic fluid port (a1) connects with the second hydraulic fluid port (a2)。
4. energy recovery control system according to claim 3, it is characterised in that described first control valve (461) is electricity proportional throttle valve。
5. energy recovery control system according to claim 1, it is characterized in that, described energy recovery control system also includes the first pressure detecting element (421) and the second pressure detecting element (422), described first pressure detecting element (421) is connected with described executive component actuator port (W), and described second pressure detecting element (422) is connected with described accumulator (44)。
6. energy recovery control system according to claim 1, it is characterized in that, described second controls valve (462) includes the first hydraulic fluid port (b1) and the second hydraulic fluid port (b2), described second the first hydraulic fluid port (b1) controlling valve (462) is connected with described accumulator (44), described second the second hydraulic fluid port (b2) controlling valve (462) is connected with described second main valve pressure oil port (P2), described second controls valve (462) has the first operating position and the second operating position, connect with the second hydraulic fluid port (b2) at described second its first hydraulic fluid port (b1) of the first operating position controlling valve (462), disconnect with the second hydraulic fluid port (b2) at described second its first hydraulic fluid port (b1) of the second operating position controlling valve (462)。
7. energy recovery control system according to any one of claim 1 to 6, it is characterized in that, described energy recovery control system also includes load pressure and compares valve (463), described main valve (47) also includes main valve load feedback mouth (Ls1), described main valve (47) can control the break-make of described first main valve pressure oil port (P1) and described main valve load feedback mouth (Ls1), described load pressure compares valve (463) for being connected with oil extraction by relatively described accumulator (44) and main valve load feedback mouth (Ls1) described in the Stress control of described main valve load feedback mouth (Ls1) and disconnecting。
8. energy recovery control system according to claim 7, it is characterized in that, described load pressure compares valve (463) and includes the first hydraulic fluid port (c1), second hydraulic fluid port (c2), first controls port and second controls port, described load pressure compares first hydraulic fluid port (c1) of valve (463), described main valve load feedback mouth (Ls1) controls port with described first and is connected to each other, described load pressure compares second hydraulic fluid port (c2) of valve (463) and is connected with oil extraction, described second controls port is connected with described accumulator (44), described load pressure compares valve (463) and has the first operating position and the second operating position, described load pressure compares valve (463), and by the Stress control of relatively described accumulator (44) and described main valve load feedback mouth (Ls1), it switches between the first operating position and the second operating position, its first hydraulic fluid port (c1) of the first operating position comparing valve (463) at described load pressure connects with the second hydraulic fluid port (c2), its first hydraulic fluid port (c1) of the second operating position comparing valve (463) at described load pressure disconnects with the second hydraulic fluid port (c2)。
9. the energy recovery control system according to any one of claim 1-6, it is characterized in that, described energy recovery control system also includes check valve (464), described accumulator (44) is connected by described second control valve (462) and described check valve (464) with described second main valve pressure oil port (P2), described check valve (464) has check valve inlet and one-way valved outlet, wherein, described check valve inlet is connected with described accumulator (44), described one-way valved outlet controls valve (462) with described second and is connected, or, described check valve inlet controls valve (462) with described second and is connected, described one-way valved outlet is connected with described second main valve pressure oil port (P2)。
10. a crane gear, it is characterised in that described crane gear includes the energy recovery control system according to any one of claim 1-9。
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| CN201510969463.3A CN105697429B (en) | 2015-12-22 | 2015-12-22 | Energy recovery control system and crane gear |
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