A kind of truck hydraulic energy-saving control system and the method for reducing fork truck operating power consumptionTechnical field
The present invention relates to fork truck fields, more particularly to a kind of truck hydraulic energy-saving control system and reduce fork truck work energyThe method of consumption.
Background technology
Fork truck is widely used in the places such as factory, warehouse, station, harbour, be mainly used for the handling of cargo, carrying, pile,De-stacking and short distance transport etc..When fork truck works, coordinate to complete sequence of operations jointly using its steering gear and operating valve.MeshBefore, the characteristics of fork truck is typically to carry out fuel feeding to its steering gear and operating valve using gear pump, the gear pump is：Fuel delivery oneIt is fixed, and it is in the state of huge discharge.However, due to fork truck, its operating valve just has big flow demand only when lifting,Just there are additional power and torque needs to engine, that is, for fork truck under other operating modes, operating valve need to there is no big flowIt asks, when engine major part and is not required the consumption of this Partial Power.Thus, the fork truck of the prior art, gear pump is in workDo not have discharge capacity can be caused to waste when big flow demand as valve, increase fuel consumption and thermal losses, increase the power consumption of engine.
The content of the invention
The present invention provides a kind of methods that truck hydraulic energy-saving control system reduces fork truck operating power consumption, which overcome existingThere is the fork truck of technology using the shortcoming present in gear oil pump feed.
The technical solution adopted by the present invention to solve the technical problems is：A kind of truck hydraulic energy-saving control system, includingThe steering gear of fork truck and operating valve, the steering gear and operating valve are respectively provided with load feedback signal output port；It further includes：
At least one first variable pump is configured as to the steering gear and/or operating valve fuel feeding, first variable pump toolThere is load feedback signal receiving port, which connects the load feedback signal output port of steering gearAnd the load feedback signal output port of operating valve；The oil outlet of first variable pump connects the oil inlet and work of the steering gearMake the oil inlet of valve；
At least one second variable pump is configured as common with the first variable pump when the operating valve has big flow demandFuel feeding is carried out for operating valve, the oil outlet of second variable pump connects the oil inlet of operating valve；
Control unit is connected with the internal controller of the second variable pump, for controlling second variable pump fuel-displacedWhether.
In one embodiment, shuttle valve is further included, the load feedback signal of the steering gear is connected in a wherein import for the shuttle valveThe load feedback signal output port of the operating valve is connected in output port, another import of the shuttle valve, and the outlet of the shuttle valve connectsLead to the load feedback signal receiving port of first variable pump.
In one embodiment, the oil outlet of first variable pump using control valve cooperation oil pipe and the steering gear intoHydraulic fluid port is connected with the oil inlet of operating valve, using the control valve when the steering gear and operating valve work, makes describedOne variable pump is preferentially to the steering gear fuel feeding.
In one embodiment, the control valve is pressure-gradient control valve, and the oil inlet of the pressure-gradient control valve connects going out for first variable pumpHydraulic fluid port, a wherein oil outlet for the pressure-gradient control valve connect the oil inlet of the steering gear, and another oil outlet connects the operating valveOil inlet, the oil-control mouth of the pressure-gradient control valve connect the load feedback signal output port of the steering gear.
In one embodiment, described control unit includes detector and processor, and detector is used to drive in fork truck for detectingMake whether the operating-controlling mechanism action of the operating valve progress big flow work and for driving the second variable pump operatingWhether engine speed reaches preset value, the input of the signal output port connection processing device of the detector, the output of processorIt is connected with the controller of second variable pump.
In one embodiment, described control unit is for manipulating the machinery whether controller of second variable pump obtains electricControl device.
In one embodiment, on the connecting path between the oil outlet of second variable pump and the oil inlet of the operating valveIt is also equipped with the check valve that hydraulic oil is only allowed to flow to operating valve from the second variable pump.
In one embodiment, first variable pump and the second variable pump are driven by same engine.
A kind of method for reducing fork truck operating power consumption, provides at least one first variable pump and at least one second variable pump,When the steering gear of fork truck and/or operating valve work, fuel feeding is carried out from the first variable pump to the steering gear of fork truck and/or operating valve；It is operating valve fuel feeding jointly by the second variable pump and the first variable pump when the operating valve of fork truck has big flow demand.
In one embodiment, when the steering gear of fork truck and operating valve work, first variable pump is preferentially to fork truckSteering gear carries out fuel feeding, after fuel feeding is carried out to the operating valve of fork truck.
Compared to the prior art, the invention has the advantages that：
1st, since the present invention uses the first variable pump and the second variable pump cooperating, under fork truck major part operating mode, byFirst variable pump carries out fuel feeding to steering gear and/or operating valve, only has big flow demand in operating valve (when forklift lifting)When fuel feeding is just carried out for operating valve by the first variable pump and the second variable pump jointly so that the present invention can according to steering gear,The traffic demand of operating valve carries out reasonable fuel feeding, avoids that discharge capacity is caused to waste, so as to reduce fuel consumption and thermal losses, sectionSave the energy；The power consumption of engine can be substantially reduced, and the engine long time is avoided to be in the working condition of high intensity, improves hairThe service life of motivation；
2nd, the present invention further coordinates the load feedback signal receiving port of the first variable pump and steering gear using shuttle valveLoad feedback signal output port and operating valve load feedback signal output port between relation, can prevent steering gearThe first variable pump is activated simultaneously with operating valve；
3rd, the present invention further coordinates fuel feeding order of first variable pump to steering gear and operating valve using pressure-gradient control valve,When steering gear and operating valve have traffic demand, it is ensured that the first variable pump is to the preferential fuel feeding of steering gear, so that Forklift WorkerAction is more coordinated, rationally when making；
4th, control unit of the invention preferably includes detector and processor, and detector is used to drive in fork truck for detectingThe hair whether operating valve carries out the operating-controlling mechanism action of big flow work and for driving the second variable pump operatingWhether motivation rotating speed reaches preset value so that hydraulic energy-saving control system of the invention is more intelligent, and operation is easier.
The present invention is described in further detail with reference to the accompanying drawings and embodiments；But a kind of truck hydraulic section of the present inventionEnergy control system is not limited to embodiment.
Description of the drawings
Fig. 1 is the principle of the present invention block diagram.
Specific embodiment
Embodiment one
A kind of truck hydraulic energy-saving control system shown in Figure 1, of the invention, steering gear 7 and work including fork truckMake valve 6, steering gear 7 is used to carry out hydraulic oil distribution during fork-truck steering, operating valve 6 for forklift lifting/decline, tilt forward and back,Hydraulic oil distribution is carried out when left and right sidesway, pallet fork opening/closing.The steering gear 7 and operating valve 6 are respectively provided with load feedback signalOutput port.Present invention additionally comprises：
First variable pump 1 is configured as to 6 fuel feeding of the steering gear 7 and/or operating valve, which hasLoad feedback signal receiving port, the load feedback signal receiving port connect the load feedback signal output port of steering gear 7And the load feedback signal output port of operating valve 6；The oil outlet of first variable pump 1 connects the oil inlet of the steering gear 7With the oil inlet of operating valve 6；
Second variable pump 2, be configured as when the operating valve 6 has big flow demand be jointly with the first variable pump 1Operating valve 6 carries out fuel feeding, and the oil outlet of second variable pump 2 connects the oil inlet of operating valve 6；
Control unit is connected with the internal controller of the second variable pump 2, for second variable pump 2 to be controlled to go outWhether oil.
In the present embodiment, present invention additionally comprises shuttle valve 4, the load of the steering gear 7 is connected in a wherein import for the shuttle valve 4The load feedback signal output port of the operating valve 6, the shuttle are connected in feedback signal output mouth, another import of the shuttle valve 4The load feedback signal receiving port of first variable pump 1 is connected in the outlet of valve 4.
In the present embodiment, the oil outlet of first variable pump 1 is using control valve cooperation oil pipe and the steering gear 7Oil inlet is connected with the oil inlet of operating valve 6, using the control valve when the steering gear 7 and operating valve 6 work, makes instituteThe first variable pump 1 is stated preferentially to 7 fuel feeding of steering gear.Specifically, the control valve be pressure-gradient control valve 5, the oil inlet of the pressure-gradient control valve 5The oil outlet of first variable pump 1 is connected, a wherein oil outlet for the pressure-gradient control valve 5 connects the oil inlet of the steering gear 7, separatelyOne oil outlet connects the oil inlet of the operating valve 6, and the oil-control mouth of the pressure-gradient control valve 5 connects the load feedback letter of the steering gear 7Number output port.
In the present embodiment, described control unit includes detector (not embodied in figure) and processor 3, and detector is used to detectWhether in fork truck for driving operating-controlling mechanism (i.e. the lifting handle of the fork truck) action of the progress of the operating valve 6 big flow work,And whether the engine speed for second variable pump 2 to be driven to operate reaches preset value, the signal output part of detectorThe input of mouth connection processing device 3, the output of processor 3 are connected with the controller of second variable pump 2.
In the present embodiment, the connecting path between the oil outlet of second variable pump 2 and the oil inlet of the operating valve 6On be also equipped with only hydraulic oil being allowed to flow to the check valve of operating valve 6 from the second variable pump 2.
In the present embodiment, 1 and second variable pump 2 of the first variable pump is driven by same engine 8.First changeAmount pump 1 and the second variable pump 2 are respectively axial plunger pump.The number of first variable pump, 1 and second variable pump 2 is not limited toOne, and when the number of the first variable pump 1 is multiple, the plurality of first variable pump 1 for operating valve 6 and/or can turn togetherCan also a part of be 6 fuel feeding of operating valve to 7 fuel feeding of device, remaining is then 7 fuel feeding of steering gear.
A kind of method of reduction fork truck operating power consumption of the present invention is：At least one first variable pump 1 and at least 1 the are providedTwo variable pumps 2, when the steering gear 7 of fork truck and/or operating valve 6 work, from the first variable pump 1 to the steering gear 7 of fork truck and/orOperating valve 6 carries out fuel feeding；It is common by the second variable pump 2 and the first variable pump 1 when the operating valve 6 of fork truck has big flow demandFor 6 fuel feeding of operating valve.Particularly, when the steering gear 7 of fork truck and operating valve 6 work, first variable pump 1 is preferentially to forkThe steering gear 7 of vehicle carries out fuel feeding, after fuel feeding is carried out to the operating valve 6 of fork truck.In this regard, realized using the pressure-gradient control valve 5, andIt is defeated that the load feedback signal receiving port of first variable pump and the load feedback signal of steering gear 7 are coordinated using the shuttle valve 4Relation between exit port and the load feedback signal output port of operating valve 6 prevents steering gear 7 and operating valve 6 while activatesFirst variable pump 1.A kind of method of reduction fork truck operating power consumption of the present invention, further includes：Described control unit, the control are providedUnit include detector (not embodied in figure) and processor 3, using detector detect fork truck in be used for drive the operating valve 6 intoWhether operating-controlling mechanism (i.e. the lifting handle of the fork truck) action of row big flow work and for driving second variable pump 2Whether the engine speed of operating reaches preset value, is operated with the lifting handle in fork truck, and for driving the second variableWhen the rotating speed of the engine of 2 operating of pump reaches preset value, by processor 3 the second variable pump 2 is controlled to obtain electric, together with the first variablePump 1 is jointly 6 fuel feeding of operating valve, and operating valve 6 is made to meet big flow demand.
A kind of course of work of truck hydraulic energy-saving control system of the present invention is as follows：
During fork truck work, under most of operating mode (except forklift lifting), the second variable pump 2 is electricly no, therefore, theTwo variable pumps 2 are standby, and discharge capacity is close to 0.When the load feedback signal receiving port of the first variable pump 1 receivesWhen steering gear 7 or operating valve 6 feed back the load feedback signal to come (load feedback signal is a small amount of hydraulic oil), first becomesThe swash plate action of amount pump 1, hydraulic oil is exported to steering gear 7 or operating valve 6.When steering gear 7 and operating valve 6 have traffic demandWhen, under the control of pressure-gradient control valve 5, the hydraulic oil of the first variable pump 1 output preferentially supplies steering gear 7, resupplies operating valve afterwards6。
Whether the detector of control unit is detected by operation the lifting handle of fork truck, when the lifting handle quilt of fork truckDuring operation, fork truck will carry out lifting action, at this point, operating valve 6 has a big flow demand, the detector of control unit will detectSignal transmission is detected to processor 3, and to the rotating speed of engine 8, when the rotating speed for detecting engine 8 reaches preset valueWhen (such as 1400 revs/min), detector transmits the signal to processor 3, therefore processor 3 controls the second variable pump 2Controller obtains electric, and the discharge capacity of the second variable pump 2 is made to increase by linear scale, is supplied together with the first variable pump 1 for operating valve 6Oil, so as to meet the needs of 6 big flow of operating valve.
When the lifting handle of fork truck resets, the second variable pump 2 stops, to 6 fuel feeding of operating valve, making operating valve 6 in fork truckWhen having traffic demand under other operating modes, only by 1 fuel feeding of the first variable pump.So so that the present invention can be according to steering gear 7, workThe traffic demand of valve 6 carries out reasonable fuel feeding, avoids that discharge capacity is caused to waste, and so as to reduce fuel consumption and thermal losses, savesThe energy；The power consumption of engine can be substantially reduced, and the engine long time is avoided to be in the working condition of high intensity, raising is startedThe service life of machine.In addition, the present invention is when operating valve 6 has big flow demand (when fork truck is lifted), by the first variable pump 1Fuel feeding is carried out to operating valve 6 jointly with the second variable pump 2, meets the big flow demand of operating valve 6, makes the speed of forklift lifting moreSoon, so as to improving the work efficiency of fork truck.
Embodiment two
Its with embodiment one difference lies in：Described control unit is to be obtained for manipulating the controller of second variable pumpMechanical manipulation device whether electricity, for example, control switch.
It, only need to (driver can when the rotating speed of engine is increased to preset value when truck driver operates lifting handleJudged by rule of thumb), then operation-control switch, make the second variable pump 2 controller obtain it is electric, you can make the second variable pump together withFirst variable pump carries out fuel feeding for operating valve, so as to meet the big flow demand of operating valve.
Above-described embodiment is only used for a kind of truck hydraulic energy-saving control system further illustrated the present invention, but the present invention is simultaneouslyIt is not limited to embodiment, any simple modification, the equivalent change that every technical spirit according to the invention makees above exampleChange and modify, each fall in the protection domain of technical solution of the present invention.