CN105271070A - Hydraulic energy-saving control system for forklift truck and method for reducing working energy consumption of forklift truck - Google Patents
Hydraulic energy-saving control system for forklift truck and method for reducing working energy consumption of forklift truck Download PDFInfo
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- CN105271070A CN105271070A CN201510481173.4A CN201510481173A CN105271070A CN 105271070 A CN105271070 A CN 105271070A CN 201510481173 A CN201510481173 A CN 201510481173A CN 105271070 A CN105271070 A CN 105271070A
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Abstract
The invention discloses a hydraulic energy-saving control system for a forklift truck and a method for reducing the working energy consumption of the forklift truck. The hydraulic energy-saving control system comprises a steering gear of the forklift truck and a work valve and further comprises a first variable pump, a second variable pump and a control unit. The first variable pump is provided with a load feedback signal receiving port which is connected with a load feedback signal output port of the steering gear and a load feedback signal output port of the work valve. An oil outlet of the first variable pump is connected with an oil inlet of the steering gear and an oil inlet of the work valve. An oil outlet of the second variable pump is communicated with the oil inlet of the work valve. The control unit is connected with the second variable pump. According to the method for reducing the working energy consumption of the forklift truck, when the steering gear and/or the work valve of the forklift truck work/works, the first variable pump supplies oil to the steering gear and/or the work valve of the forklift truck; and when the work valve of the forklift truck has the requirement for large flow, the second variable pump and the first variable pump supply oil to the work valve together. According to the hydraulic energy-saving control system, oil can be supplied reasonably according to the flow of the steering gear and the work valve, so that waste of displacement is avoided, and energy is saved.
Description
Technical field
The present invention relates to fork truck field, particularly relate to a kind of method of truck hydraulic energy-saving control system and reduction fork truck operating power consumption.
Background technology
Fork truck is widely used in the places such as factory, warehouse, station, harbour, is mainly used in the handling of goods, carrying, pile, de-stacking and short range transport etc.During fork truck work, its deflector and operating valve is utilized jointly to coordinate sequence of operations.At present, fork truck normally adopts gear type pump to carry out fuel feeding to its deflector and operating valve, and the feature of this gear type pump is: delivery quality is certain, and is all in the state of huge discharge.But, due to fork truck only when lifting its operating valve just have large discharge demand, just have extra power and moment of torsion needs to driving engine, that is, fork truck is under other operating mode, and its operating valve does not have large discharge demand, does not need the consumption of this part power when much of its.Thus, the fork truck of prior art, its gear type pump can cause discharge capacity to waste when operating valve does not have large discharge demand, increase fuel oil consumption and waste of heat, increases the power consumption of driving engine.
Summary of the invention
The invention provides a kind of method that truck hydraulic energy-saving control system reduces fork truck operating power consumption, which overcome the weak point existing for fork truck employing gear type pump fuel feeding of prior art.
The technical solution adopted for the present invention to solve the technical problems is: a kind of truck hydraulic energy-saving control system, and comprise deflector and the operating valve of fork truck, this deflector and operating valve have load feedback signal output port respectively; Also comprise:
At least one first controllable capacity pump, it is configured to described deflector and/or operating valve fuel feeding, this first controllable capacity pump has load feedback signal receiving port, and this load feedback signal receiving port connects the load feedback signal output port of deflector and the load feedback signal output port of operating valve; The oil outlet of this first controllable capacity pump connects the oil inlet of described deflector and the oil inlet of operating valve;
At least one second controllable capacity pump, its be configured to when described operating valve has large discharge demand and the first controllable capacity pump jointly for operating valve carries out fuel feeding, the oil outlet of this second controllable capacity pump connects the oil inlet of operating valve;
Control unit, it is connected with the internal controller of the second controllable capacity pump, whether fuel-displaced for controlling described second controllable capacity pump.
In one embodiment, also comprise shuttle valve, the load feedback signal output port of described deflector is connected in a wherein import of this shuttle valve, the load feedback signal output port of described operating valve is connected in another import of this shuttle valve, and the load feedback signal receiving port of described first controllable capacity pump is connected in the outlet of this shuttle valve.
In one embodiment, the oil outlet of described first controllable capacity pump adopts a control cock to coordinate oil pipe to be connected with the oil inlet of operating valve with the oil inlet of described deflector, utilize this control cock when described deflector and operating valve all work, make described first controllable capacity pump preferentially to described deflector fuel feeding.
In one embodiment, described control cock is pressure-gradient control valve, the oil inlet of this pressure-gradient control valve connects the oil outlet of described first controllable capacity pump, a wherein oil outlet of this pressure-gradient control valve connects the oil inlet of described deflector, another oil outlet connects the oil inlet of described operating valve, and the control hydraulic fluid port of this pressure-gradient control valve connects the load feedback signal output port of described deflector.
In one embodiment, described control unit comprises detector and treater, detector is for detecting in fork truck whether carry out the operating-controlling mechanism action of large discharge work for ordering about described operating valve, and for driving the engine speed of described second controllable capacity pump running whether to reach preset value, the input of the signal output port connection handling device of this detector, the output of treater is connected with the controller of described second controllable capacity pump.
In one embodiment, described control unit is that the controller for manipulating described second controllable capacity pump obtains whether electric mechanical manipulation device.
In one embodiment, the connecting path between the oil outlet of described second controllable capacity pump and the oil inlet of described operating valve is also provided with and only allows hydraulic oil to flow to the check valve of operating valve from the second controllable capacity pump.
In one embodiment, described first controllable capacity pump and the second controllable capacity pump are driven by same driving engine.
Reduce a method for fork truck operating power consumption, at least one first controllable capacity pump and at least one second controllable capacity pump are provided, when the deflector of fork truck and/or operating valve work, carry out fuel feeding by the first controllable capacity pump to the deflector of fork truck and/or operating valve; When the operating valve of fork truck has large discharge demand, be operating valve fuel feeding jointly by the second controllable capacity pump and the first controllable capacity pump.
In one embodiment, when the deflector of fork truck and operating valve all work, described first controllable capacity pump preferentially carries out fuel feeding to the deflector of fork truck, and the rear operating valve to fork truck carries out fuel feeding.
Compared to prior art, the present invention has following beneficial effect:
1, because the present invention adopts the first controllable capacity pump and the second controllable capacity pump cooperating, under fork truck major part operating mode, by the first controllable capacity pump, fuel feeding is carried out to deflector and/or operating valve, only when operating valve has large discharge demand (when forklift lifting) just by the first controllable capacity pump and the second controllable capacity pump jointly for operating valve carries out fuel feeding, make the present invention can carry out reasonable fuel feeding according to the traffic demand of deflector, operating valve, avoid causing discharge capacity to waste, thus fuel oil consumption and waste of heat can be reduced, save the energy; Greatly can reduce the power consumption of driving engine, and avoid the engine long time to be in the mode of operation of high strength, improve the service life of driving engine;
2, the present invention adopts shuttle valve to coordinate the relation between the load feedback signal output port of the load feedback signal receiving port of the first controllable capacity pump and the load feedback signal output port of deflector and operating valve further, can prevent deflector and operating valve from activating the first controllable capacity pump simultaneously;
3, the present invention adopts pressure-gradient control valve to coordinate the first controllable capacity pump to the fuel feeding order of deflector and operating valve further, when deflector and operating valve all have traffic demand, can ensure that the first controllable capacity pump is to the preferential fuel feeding of deflector, thus when fork truck is worked, action is coordinated, rationally more;
4, control unit of the present invention preferably includes detector and treater, detector is for detecting in fork truck whether carry out the operating-controlling mechanism action of large discharge work for ordering about described operating valve, and for driving the engine speed of described second controllable capacity pump running whether to reach preset value, make hydraulic energy-saving control system of the present invention more intelligent, operate easier.
Below in conjunction with drawings and Examples, the present invention is described in further detail; But a kind of truck hydraulic energy-saving control system of the present invention is not limited to embodiment.
Accompanying drawing explanation
Fig. 1 is functional block diagram of the present invention.
Detailed description of the invention
Embodiment one
Shown in Figure 1, a kind of truck hydraulic energy-saving control system of the present invention, comprise deflector 7 and the operating valve 6 of fork truck, deflector 7 for carrying out hydraulic oil distribution during fork-truck steering, operating valve 6 for forklift lifting/decline, tilt forward and back, left and right sidesway, pallet fork opening/closing time carry out hydraulic oil distribution.This deflector 7 and operating valve 6 have load feedback signal output port respectively.The present invention also comprises:
First controllable capacity pump 1, it is configured to described deflector 7 and/or operating valve 6 fuel feeding, this first controllable capacity pump 1 has load feedback signal receiving port, and this load feedback signal receiving port connects the load feedback signal output port of deflector 7 and the load feedback signal output port of operating valve 6; The oil outlet of this first controllable capacity pump 1 connects the oil inlet of described deflector 7 and the oil inlet of operating valve 6;
Second controllable capacity pump 2, it is configured to when described operating valve 6 has large discharge demand and the first controllable capacity pump 1 carries out fuel feeding for operating valve 6 jointly, and the oil outlet of this second controllable capacity pump 2 connects the oil inlet of operating valve 6;
Control unit, it is connected with the internal controller of the second controllable capacity pump 2, whether fuel-displaced for controlling described second controllable capacity pump 2.
In the present embodiment, the present invention also comprises shuttle valve 4, the load feedback signal output port of described deflector 7 is connected in a wherein import of this shuttle valve 4, the load feedback signal output port of described operating valve 6 is connected in another import of this shuttle valve 4, and the load feedback signal receiving port of described first controllable capacity pump 1 is connected in the outlet of this shuttle valve 4.
In the present embodiment, the oil outlet of described first controllable capacity pump 1 adopts a control cock to coordinate oil pipe to be connected with the oil inlet of operating valve 6 with the oil inlet of described deflector 7, utilize this control cock when described deflector 7 and operating valve 6 all work, make described first controllable capacity pump 1 preferential to described deflector 7 fuel feeding.Specifically, described control cock is pressure-gradient control valve 5, the oil inlet of this pressure-gradient control valve 5 connects the oil outlet of described first controllable capacity pump 1, a wherein oil outlet of this pressure-gradient control valve 5 connects the oil inlet of described deflector 7, another oil outlet connects the oil inlet of described operating valve 6, and the control hydraulic fluid port of this pressure-gradient control valve 5 connects the load feedback signal output port of described deflector 7.
In the present embodiment, described control unit comprises detector (not embodying in figure) and treater 3, whether detector carries out operating-controlling mechanism (i.e. the lifting handle of the fork truck) action of large discharge work for ordering about described operating valve 6 in fork truck for detecting, and whether reach preset value for the engine speed driving described second controllable capacity pump 2 to operate, the input of the signal output port connection handling device 3 of detector, the output of treater 3 is connected with the controller of described second controllable capacity pump 2.
In the present embodiment, the connecting path between the oil outlet of described second controllable capacity pump 2 and the oil inlet of described operating valve 6 is also provided with and only allows hydraulic oil to flow to the check valve of operating valve 6 from the second controllable capacity pump 2.
In the present embodiment, described first controllable capacity pump 1 and the second controllable capacity pump 2 are driven by same driving engine 8.This first controllable capacity pump 1 and the second controllable capacity pump 2 are respectively axial plunger pump.The number of described first controllable capacity pump 1 and the second controllable capacity pump 2 is not limited to one, and when the number of the first controllable capacity pump 1 is multiple, the plurality of first controllable capacity pump 1 can be operating valve 6 and/or deflector 7 fuel feeding together, can a part be also operating valve 6 fuel feeding, and all the other are then deflector 7 fuel feeding.
A kind of method reducing fork truck operating power consumption of the present invention is: provide at least one first controllable capacity pump 1 and at least one second controllable capacity pump 2, when the deflector 7 of fork truck and/or operating valve 6 work, carry out fuel feeding by the first controllable capacity pump 1 to the deflector 7 of fork truck and/or operating valve 6; When the operating valve 6 of fork truck has large discharge demand, be operating valve 6 fuel feeding jointly by the second controllable capacity pump 2 and the first controllable capacity pump 1.Especially, when the deflector 7 of fork truck and operating valve 6 all work, described first controllable capacity pump 1 preferentially carries out fuel feeding to the deflector 7 of fork truck, and the rear operating valve 6 to fork truck carries out fuel feeding.To this, described pressure-gradient control valve 5 is adopted to realize, and adopt the relation that described shuttle valve 4 is coordinated between the load feedback signal output port of the load feedback signal receiving port of the first controllable capacity pump and the load feedback signal output port of deflector 7 and operating valve 6, prevent deflector 7 and operating valve 6 from activating the first controllable capacity pump 1 simultaneously.A kind of method reducing fork truck operating power consumption of the present invention, also comprise: described control unit is provided, this control unit comprises detector (not embodying in figure) and treater 3, whether operating-controlling mechanism (i.e. the lifting handle of the fork truck) action utilizing detector to detect to carry out large discharge work in fork truck for ordering about described operating valve 6, and whether reach preset value for the engine speed driving described second controllable capacity pump 2 to operate, operated with the lifting handle at fork truck, and when the rotating speed of the driving engine operated for driving the second controllable capacity pump 2 reaches preset value, controlling the second controllable capacity pump 2 by treater 3 obtains electric, be operating valve 6 fuel feeding jointly together with the first controllable capacity pump 1, operating valve 6 is made to meet large discharge demand.
The working process of a kind of truck hydraulic energy-saving control system of the present invention is as follows:
In fork truck working process, under most of operating mode (except forklift lifting), the second controllable capacity pump 2 not electric, therefore, the second controllable capacity pump 2 is standby, and its discharge capacity is close to 0.When the load feedback signal receiving port of the first controllable capacity pump 1 receives (this load feedback signal is a small amount of hydraulic oil) when deflector 7 or operating valve 6 feed back the load feedback signal of coming, the swash plate action of the first controllable capacity pump 1, exports to deflector 7 or operating valve 6 by hydraulic oil.When deflector 7 and operating valve 6 all have traffic demand, under the control of pressure-gradient control valve 5, the hydraulic oil that the first controllable capacity pump 1 exports preferentially supplies deflector 7, resupplies operating valve 6 afterwards.
Whether the lifting handle of detector to fork truck of control unit is detected by operation, when the lifting handle of fork truck is operated, fork truck will carry out lifting action, now, operating valve 6 has large discharge demand, the detector of control unit by the Signal transmissions that detects to treater 3, and the rotating speed of driving engine 8 is detected, when detecting that the rotating speed of driving engine 8 reaches preset value (such as 1400 revs/min), detector by this Signal transmissions to treater 3, the controller that therefore treater 3 controls the second controllable capacity pump 2 obtains electric, make the discharge capacity linearly ratio increase of the second controllable capacity pump 2, be operating valve 6 fuel feeding together with the first controllable capacity pump 1, thus meet the demand of operating valve 6 large discharge.
When the lifting handle of fork truck resets, the second controllable capacity pump 2 stops operating valve 6 fuel feeding, when making operating valve 6 have a traffic demand under other operating mode of fork truck, only by the first controllable capacity pump 1 fuel feeding.So, make the present invention can carry out reasonable fuel feeding according to the traffic demand of deflector 7, operating valve 6, avoid causing discharge capacity to waste, thus fuel oil consumption and waste of heat can be reduced, save the energy; Greatly can reduce the power consumption of driving engine, and avoid the engine long time to be in the mode of operation of high strength, improve the service life of driving engine.In addition, the present invention, when operating valve 6 has large discharge demand (when fork truck carries out lifting), jointly carries out fuel feeding to operating valve 6 by the first controllable capacity pump 1 and the second controllable capacity pump 2, meets the large discharge demand of operating valve 6, make the speed of forklift lifting faster, thus improve the work efficiency of fork truck.
Embodiment two
The difference of itself and embodiment one is: described control unit is that the controller for manipulating described second controllable capacity pump obtains whether electric mechanical manipulation device, such as, and master cock.
When truck driver operation lifting handle, only need when the rotating speed of driving engine brings up to preset value (chaufeur can judge by rule of thumb), operation control switch again, the controller of the second controllable capacity pump 2 is made to obtain electric, the second controllable capacity pump can be made to be that operating valve carries out fuel feeding together with the first controllable capacity pump, thus to meet the large discharge demand of operating valve.
Above-described embodiment is only used for further illustrating a kind of truck hydraulic energy-saving control system of the present invention; but the present invention is not limited to embodiment; every above embodiment is done according to technical spirit of the present invention any simple modification, equivalent variations and modification, all fall in the protection domain of technical solution of the present invention.
Claims (10)
1. a truck hydraulic energy-saving control system, comprise deflector and the operating valve of fork truck, this deflector and operating valve have load feedback signal output port respectively; It is characterized in that: also comprise:
At least one first controllable capacity pump, it is configured to described deflector and/or operating valve fuel feeding, this first controllable capacity pump has load feedback signal receiving port, and this load feedback signal receiving port connects the load feedback signal output port of deflector and the load feedback signal output port of operating valve; The oil outlet of this first controllable capacity pump connects the oil inlet of described deflector and the oil inlet of operating valve;
At least one second controllable capacity pump, its be configured to when described operating valve has large discharge demand and the first controllable capacity pump jointly for operating valve carries out fuel feeding, the oil outlet of this second controllable capacity pump connects the oil inlet of operating valve;
Control unit, it is connected with the second controllable capacity pump, whether fuel-displaced for controlling described second controllable capacity pump.
2. truck hydraulic energy-saving control system according to claim 1, it is characterized in that: also comprise shuttle valve, the load feedback signal output port of described deflector is connected in a wherein import of this shuttle valve, the load feedback signal output port of described operating valve is connected in another import of this shuttle valve, and the load feedback signal receiving port of described first controllable capacity pump is connected in the outlet of this shuttle valve.
3. truck hydraulic energy-saving control system according to claim 1 and 2, it is characterized in that: the oil outlet of described first controllable capacity pump adopts a control cock to coordinate oil pipe to be connected with the oil inlet of operating valve with the oil inlet of described deflector, utilize this control cock when described deflector and operating valve all work, make described first controllable capacity pump preferentially to described deflector fuel feeding.
4. truck hydraulic energy-saving control system according to claim 3, it is characterized in that: described control cock is pressure-gradient control valve, the oil inlet of this pressure-gradient control valve connects the oil outlet of described first controllable capacity pump, a wherein oil outlet of this pressure-gradient control valve connects the oil inlet of described deflector, another oil outlet connects the oil inlet of described operating valve, and the control hydraulic fluid port of this pressure-gradient control valve connects the load feedback signal output port of described deflector.
5. truck hydraulic energy-saving control system according to claim 1, it is characterized in that: described control unit comprises detector and treater, detector is for detecting in fork truck whether carry out the operating-controlling mechanism action of large discharge work for ordering about described operating valve, and for driving the engine speed of described second controllable capacity pump running whether to reach preset value, the input of the signal output port connection handling device of this detector, the output of treater is connected with the controller of described second controllable capacity pump.
6. truck hydraulic energy-saving control system according to claim 1, is characterized in that: described control unit is that the controller for manipulating described second controllable capacity pump obtains whether electric mechanical manipulation device.
7. the truck hydraulic energy-saving control system according to claim 1 or 5 or 6, is characterized in that: the connecting path between the oil outlet of described second controllable capacity pump and the oil inlet of described operating valve is also provided with and only allows hydraulic oil to flow to the check valve of operating valve from the second controllable capacity pump.
8. truck hydraulic energy-saving control system according to claim 1, is characterized in that: described first controllable capacity pump and the second controllable capacity pump are driven by same driving engine.
9. reduce a method for fork truck operating power consumption, it is characterized in that: at least one first controllable capacity pump and at least one second controllable capacity pump are provided, when deflector and/or the operating valve work of fork truck, by the first controllable capacity pump, fuel feeding is carried out to the deflector of fork truck and/or operating valve; When the operating valve of fork truck has large discharge demand, be operating valve fuel feeding jointly by the second controllable capacity pump and the first controllable capacity pump.
10. the method for reduction fork truck operating power consumption according to claim 9, is characterized in that: when the deflector of fork truck and operating valve all work, described first controllable capacity pump preferentially carries out fuel feeding to the deflector of fork truck, and the rear operating valve to fork truck carries out fuel feeding.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510481173.4A CN105271070B (en) | 2015-08-07 | 2015-08-07 | A kind of truck hydraulic energy-saving control system and the method for reducing fork truck operating power consumption |
| EP16177465.8A EP3127856B1 (en) | 2015-08-07 | 2016-07-01 | Hydraulic energy saving control system for forklift and method for lowering the operating energy consumption for forklift trucks |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510481173.4A CN105271070B (en) | 2015-08-07 | 2015-08-07 | A kind of truck hydraulic energy-saving control system and the method for reducing fork truck operating power consumption |
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| Publication Number | Publication Date |
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| CN105271070A true CN105271070A (en) | 2016-01-27 |
| CN105271070B CN105271070B (en) | 2018-06-05 |
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| CN201510481173.4A Active CN105271070B (en) | 2015-08-07 | 2015-08-07 | A kind of truck hydraulic energy-saving control system and the method for reducing fork truck operating power consumption |
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2015
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|---|---|---|---|---|
| US4449365A (en) * | 1979-11-19 | 1984-05-22 | Allis-Chalmers Corporation | Lift, tilt and steering control for a lift truck |
| US4819430A (en) * | 1983-01-21 | 1989-04-11 | Hydreco, Inc. | Variably charged hydraulic circuit |
| DE3508339C2 (en) * | 1985-03-08 | 1988-01-21 | Mannesmann Rexroth Gmbh, 8770 Lohr, De | |
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