CN2076972U - Fork lift truck energy-saving hydraulic control system - Google Patents

Fork lift truck energy-saving hydraulic control system Download PDF

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Publication number
CN2076972U
CN2076972U CN 90215492 CN90215492U CN2076972U CN 2076972 U CN2076972 U CN 2076972U CN 90215492 CN90215492 CN 90215492 CN 90215492 U CN90215492 U CN 90215492U CN 2076972 U CN2076972 U CN 2076972U
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motor
control
machine
variable pump
valve
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彭昌宗
彭健强
彭伟强
彭姗姗
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彭昌宗
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Abstract

The utility model relates to an energy conservation hydraulic system regarding the static pressure driving battery forklift. The system works through that a DC electric machine drives a variable capacity pump, whose intake side is allocated with a one-way valve and two bi-bit two-way valves so as to control a low pressure energy accumulator and a high pressure accumulator respectively through electricity or liquid, make a recovery of the fork lift truck lifting mechanism potential energy and the running mechanism braking kinetic energy, and to make full use of all the energy so that the DC electric machine fork lift truck won't produce heavy current when it starts up and the happening of storage battery heavy current discharging is decreased with the result that the application capacity and life length of the storage battery is prolonged. The system can also be applied to other handling trucks of various kinds.

Description

The present invention relates to a kind of energy-conserving hydraulic driving control system of fork truck.
The existing storage battery fork truck when transporting goods, be unloaded the goods of certain altitude down, and these goods have potential energy, and in unloading process, by hoist cylinder, speed control valve is excreted to fuel tank, and these potential energies have wasted with regard to becoming heat energy.Fork truck is again a kind of handling machinery with less turning radius, and short-range advancing carried out in its loading, and turning retreats, and operating modes such as braking are moved very frequently, and the kinetic energy of fork truck when brake snub equally also becomes friction heat and loses.Fork truck starts DC machine when the handling goods very frequent, makes storage battery be in heavy-current discharge, and this not only reduces the use capacity of storage battery, shortened the service life of storage battery simultaneously again.The form of heavy-current discharge mainly contains three kinds; (1) according to the characteristic of DC machine, the electric current when electric motor starting is 10~20 times of rated current, and in order to reduce starting current, often crosstalk resistance in circuit makes starting current be reduced to 2~2.5 times of rated current.Here just there is consuming electric power in crosstalk resistance, and the time of only managing the big electric current of electric motor starting is shorter, but under the frequent operating mode of starting, the energy that is consumed also is very considerable.Starting current after the DC machine crosstalk resistance is still very big in addition.For example: the storage battery forktruck of 1 ton of hoisting capacity, starting current still 400 peaces doubly more than.If the fork truck operating mode is two above motors stack startings simultaneously, starting current at this moment will 1000 peaces doubly about.(2) fork truck hoists and when climbing operating mode, the discharge current of DC machine also in nearly 200 peaces doubly fully loaded.If these two kinds of operating modes are carried out simultaneously, then discharge current reaches 400 peaces doubly.(3) existing fork truck user, in order to accelerate handling labor, direct inverted running when fork truck advances often, at this moment the counter-current of DC machine up to 1000 peaces doubly, big like this electric current can make motor, electrical equipment and mechanical drive be subjected to impact load and damages; Above-mentioned several heavy-current discharge phenomenon is on the one hand damaged accumulator electrode, and battery age is shortened greatly, from relevant statistical figure, storage battery service life, has only 1/4 of rated life.Heavy-current discharge greatly reduces the loading capacity of storage battery on the other hand, even has only 1/2~1/5 of original specified loading capacity.
If the potential energy and the kinetic energy of above-mentioned storage battery forktruck are reclaimed, and are made full use of; It is equally big to make DC machine reduce to load current at the big electric current of Fraquent start simultaneously; In addition to many motor stack heavy-current discharges; Hoist and the heavy-current discharge when climbing; The heavy-current discharge that motor commutates suddenly and turns round; Can both solve then concerning storage battery, be exactly to have increased the use capacity widely, prolonged the life-span, and certain fork truck like this is not also produced at present.
In view of the foregoing, the fork truck energy-conserving hydraulic driving control system that the purpose of this invention is to provide a kind of novelty.It mainly is by one and swashs (or compounding) DC machine, drive a bidirectional variable hydraulic pump/motor, a check valve is housed between controllable capacity pump and oil suction case, by two two position two-way valves automatically controlled or hydraulic control, control a high pressure accumulator and a low pressure accumulator respectively, reclaim unavailable in the past potential energy and kinetic energy.After being made full use of, make whole hydraulic control system energy consumption minimum.The energy and the relative assembly of storing by energy storage makes operating modes such as DC machine starting current and lifting climbing commutation suddenly simultaneously, do not produce heavy-current discharge, makes DC machine, electrical equipment, and storage battery has obtained protection, has prolonged service life.Concerning storage battery, also increased loading capacity.
The drawing simple explanation:
The hydraulic control system figure of the embodiment that Fig. 1 proposes according to the present invention.
Single pedal control mechanism schematic diagram in Fig. 2 present embodiment.
Two-pedal control mechanism principle figure in Fig. 3 present embodiment.
The control circuit schematic diagram of Fig. 4 present embodiment.
Fig. 5 is the single pedal control mechanism schematic diagram of Fig. 1 variant embodiment.
Fig. 6 is the two-pedal control mechanism principle figure of Fig. 1 variant embodiment.
Fig. 7 is the control circuit schematic diagram of Fig. 1 variant embodiment.
Fig. 8 is another variant embodiment hydraulic control system part oil circuit figure.
Below in conjunction with accompanying drawing example of the present invention is illustrated.
In Fig. 1, storage battery 1 on the fork truck it by appliance controller 2, to and swash or compounding DC machine 3(hereinafter to be referred as DC machine) propulsion source is provided, thereby drive two-way variable displacement pump/motors 4(hereinafter to be referred as the variable pump/motor) provide pressure oil-source to the fork truck actuating unit.The device of control variable pump/motor 4 is well-known technology.For example: pedal control mechanism 8, can pass through a pedal, or two pedals (seeing Fig. 2,3) drive micro-switch L1L2, starting DC machine 3, it drives simultaneously shoulders bar machinery 8d or apportioning valve 8E, and the servomechanism 8F of variable pump/motor 4 changes swash plate 5 in certain positive and negative angular range, the size of discharge capacity/motor can not only be changed, the direction of oil stream can also be changed.
Be provided with between variable pump/motor 4 and the fuel tank 6 and place restrictions on the check valve 7 that pressure oil returns fuel tank, but variable pump/motor 4 can be by check valve 7 to fuel tank 6 oil suctions.Variable pump/motor 4 is connected two-position two-way solenoid valve 14 with right side pipeline between the check valve 7, (hereinafter to be referred as electromagnetic valve) safety valve 16, and low pressure accumulator 15.Left side pipeline between variable pump/motor 4 and check valve 7 connects bi-bit bi-pass change-over valve 20, (hereinafter to be referred as change-over valve) safety valve 21, and high pressure accumulator 23.The magnet coil 14a of electromagnetic valve 14 can be by 3-position-3-way hand change over valve 11(hereinafter to be referred as hand change over valve) hand switch L4 and the micro-switch switching that L1 controls of pedal control mechanism 8.
The pressure oil of variable pump/motor 4 outputs, process hand change over valve 11,12,13(are at meta) direct oil sump tank 6.Two pipelines are arranged between variable pump/motor 4 and the hand change over valve 11, and one is connected with change-over valve 20.Another pipeline is an attachment security valve 9, and it is a top pressure of setting hydraulic efficiency pressure system.Its mouth of hand change over valve 11 has two oil circuits in parallel, and wherein one connects check valve 17.These two oil circuits in parallel all with hoist cylinder 25, and safety valve 24 connects, safety valve 24 is a pressure of setting the oil circuit that hoists.
Hand change over valve 12 is that control fork truck dump ram 26 is made door frame inclination usefulness, and this is known.
Hand change over valve 13 is 27 rotatings of control walking HM Hydraulic Motor, and the recovery of kinetic energy.The mouth of hand change over valve 13 and brake activation valve 31, governor valve 30a, Fill valve 30b, walking HM Hydraulic Motor 27, and check valve 28,29 connects.(brake activation valve 31 can use with the drg interlock of fork truck, also can not establish brake activation valve 31, and by hand change over valve 13, own meta function (F) is braked).
When hand change over valve 13 is in meta (F), or brake activation valve 31 is when braking mode, because the inertia of vehicle makes HM Hydraulic Motor 27 make the operating mode of pump, pressure oil output is by check valve 28,29, pressure-gradient control valve 22, provide pressure oil to energy storage 23, reclaim kinetic energy.
The action to embodiment now is described
When (one) DC machine is started;
Pedal control mechanism 8 is when reference position, and variable pump/motor 4 is to be in meta, and discharge capacity is zero.When floor sheet controller 8 just depresses as forward, first micro-switch L1 action (seeing Fig. 1,2,3,4) magnet coil 14a action, electromagnetic valve 14 switches to (I) position from the position of (H), pressure oil process electromagnetism magnet valve 14 in the low pressure accumulator 15 is to variable pump/motor 4 fuel feeding, the swash plate 5 of while controllable capacity pump 4 is the certain angle of forward inclination, makes the HM Hydraulic Motor operating mode and is rotated.Because variable pump/motor 4 connects together with DC machine 3, DC machine 3 overcomes static friction torque, also rotation simultaneously, rising along with rotating speed, counter potential also increases gradually, after DC machine 4 accelerates to rated speed of rotation, speed switch 36 connection control circuit (see figure 4)s pedal control mechanism 8 continuation at this moment that are contained on the DC machine 3 are down stepped on, and the normal opened contact of the second micro-switch L2 is connected, contactless switch Z action, DC machine 3 and storage battery 1 energising, DC machine 3 is rotated, owing to be to be in certain rotating speed, when power supply connects, do not produce the big electric current of starting, only have load current.
When the second micro-switch L2 moved, its normally closed switch disconnected, and the circuit of magnet coil 14a is disconnected, and electromagnetic valve 14 resets into (H) position from (I) position, and low pressure accumulator 15 does not supply pressure oil to the variable pump/motor.
When the forklift operator person as stepping on pedal gear 8 too violent, will cause full voltage starting DC machine 3, and speed switch 36 does not move DC machine 3 fail to starts, the operating mode of big electric current starting just can not take place yet.
(2) recovery of goods lifting process and potential energy and utilization
When (1) goods rises
Because the operating mode of front (), the starting process of DC machine 3 is narrated, no longer repeats (below run into also repeated description no longer of similar starting duty) here.
(see figure 1) is with hand change over valve 11 after DC machine 3 is driven, switch to (a) position, from fuel tank 6 oil suctions, mouth is by hand change over valve 11 by check valve 7 for the input end of controllable capacity pump 4, check valve 17 provides pressure oil to load oil cylinder 25, and the cargo-carring goods of fork truck is risen.Hand change over valve 11 is switched to meta (b) from (a) position, and the oil circuit between controllable capacity pump 4 and the oil cylinder 25 is cut off.Oil cylinder 25 just stops to rise, and goods is maintained on the position of certain altitude.
When (2) goods descends (occasion that load is heavy)
Hand change over valve 11, switch to (C) position by meta (b), under the effect of goods gravity, the pressure oil in the oil cylinder 25 is flowed into to controllable capacity pump 4, under the effect of high pressure oil, make change-over valve 20 switch to the position of (J), at this moment pedal control mechanism 8 oppositely depresses, and variable pump/motor 4 is made the motor operating mode and rotated, drive DC machine 3 simultaneously, speed switch 36 actions, in this 3rd micro-switch L3 action simultaneously, (see figure 4) makes storage battery 1 to DC machine 3 power supplies and driving.Swash plate 5 is done oppositely to regulate and is made the commutation of oil stream, provides pressure oil to high pressure accumulator 23, and like this potential energy of goods being become hydraulic pressure can store.
Hand change over valve 11 switches to (b) position, and oil cylinder 25 stops to high pressure accumulator 23 for pressure oil.At this moment pilot operated directional control valve that is switch to (K) position keeps the oil pressure of high pressure accumulator 23.
(3) underload decline (underloading or unloaded decline)
Hand change over valve 11 switches to (C) position by (b) position, because load is lighter, or it is unloaded, pressure in the oil cylinder 25 is less, hydraulic directional control valve 20 is failure to actuate, at this moment the hand switch L4 on the handle of hand change over valve 11 is connected, make magnet coil 14a excitation, electromagnetic valve 14 switches to (I) position, pressure oil less in the oil cylinder 25 is flowed into to controllable capacity pump 4, and at this moment pedal control mechanism 8 oppositely depresses and (sees Fig. 2,3,4), the 3rd micro-switch L4 action, make storage battery 1 to DC machine 4 power supplies, and drive, controllable capacity pump 4 is made the motor operating mode, and swash plate 5 is being done oppositely adjusting, make oil flow to low pressure accumulator 15 pressure oil is provided, like this underloading or unloaded potential energy are reclaimed, because can regulated variable pump 4 swash plates 5, oil cylinder 25 descending speeds also just controlled, do not exist owing to carry under light or the idle condition, the slow problem of oil cylinder 25 descending speeds takes place.
No matter in the potential energy of heavy duty or underloading reclaims, variable pump/motor 4 is made antiport, supplies pressure oil to the high and low pressure energy storage, in order to prevent that oppositely exporting oil mass causes suction empty too soon, oppositely on the pedal stop screw 8a is being housed, (also available limiting stopper) is to place restrictions on the output oil mass.Simultaneously Fill valve 32 is housed on the oil circuit of variable pump/motor 4, gives repairing, eliminate emptying phenomenon by fuel tank 6.
(4) rising once more of goods
The operating mode of starting DC machine 3 is identical with aforementioned (one).Hand change over valve 11 switches to (a) position, when controllable capacity pump 4 during to load oil cylinder 25 fuel feeding, reach certain pressure, make change-over valve 20 switch to (J) position, the high pressure oil of storage in the high pressure accumulator 23, sucking hole to controllable capacity pump 4 provides pressure oil, because the effect of check valve 7, pressure oil can not flow into fuel tank 6.Make the load reduction of DC machine 3 like this, reach the purpose of saving the energy.
(3) recovery of traveling gear braking energy and utilization
DC machine 3 starting duty are identical with aforementioned (one).Hand change over valve 13 switches to (E) position, the working connection process check valve 19 of controllable capacity pump 4, and brake activation valve 31, Fill valve 30b, governor valve 30a provides pressure oil to walking HM Hydraulic Motor 27, drives HM Hydraulic Motor 27, and the speed of walking is by pedal control mechanism 8 controls.When fork truck from a high speed, the occasion that the needs that drive at moderate speed slow down or brake, perhaps in very long ramp slide down, hand change over valve 13 is switched to (F) position, or depress brake activation valve 31, cut off the oil circuit between controllable capacity pump 4 and the HM Hydraulic Motor 27, at this moment the operator has returned to incipient state with pedal control mechanism 8 certainly, cuts off the power supply of DC machine 3.
Because the influence of the inertia of fork truck drives HM Hydraulic Motor 27 direction shown in arrow among Fig. 1 and rotates, the operating mode of making pump provides pressure oil, by check valve 28, opens pressure valve 22, flows into high pressure accumulator 23, and braking energy is stored in the energy storage 23.In the time spent of doing that HM Hydraulic Motor 27 plays pump, the drive torque that it is required plays the effect of lock torque all the time.After if high pressure accumulator 23 is full of by pressure oil, can leads to safety valve 21 and turn back to fuel tank 6.
This that stored be energy partly, equally can preceding method, to walking, provide pressure oil, and reach purpose of energy saving.
(4) inverted running of traveling gear
Fork truck often needs the forward-reverse operation when transporting goods.If make traveling gear by mechanical drive with DC machine, make inverted running when ahead running, the counter-current of DC machine is pacified doubly big like this electric current up to 1000 at once, can make motor, electrical equipment and mechanical drive be impacted and damage, so be not allow to take place this operating mode.And as shown in Figure 1, switch to (E) position by hand change over valve 13, walking HM Hydraulic Motor 27 is moved in working direction.When hand change over valve 13 being directly switch to (G) position, make HM Hydraulic Motor 27 inverted runnings.Because hydrostatic drive has software feature, adds high pressure accumulator 23, reclaim kinetic energy on the one hand, play buffer action again simultaneously, so the disadvantage that does not have above-mentioned mechanical drive to have.And can improve the carrying work efficiency.
Modified example of the present invention is shown in Fig. 5,6,7, and its hydraulic control system is identical with Fig. 1.During forklift operator, Q connects with the mains with key switch, and (see figure 7) pedal control mechanism 8 can be made up of a pedal gear (see figure 5) or two pedal gear (see figure 6)s.When work, depress as forward, bar 8d is shouldered in drive, first micro-switch L1 action, magnet coil 14a energising, electromagnetic valve 14 switches to (I) position, pressure oil in the low pressure accumulator 15, to variable pump/motor 4 fuel feeding, shoulder bar 8d and promote swash plate 5(or passing ratio valve, servomechanism) certain angle that tilts is made the HM Hydraulic Motor operating mode and is rotated, because DC machine 3 connects together also rotation simultaneously with variable pump/motor 4, be contained in speed switch 36 actions on the DC machine 3, connect control circuit.At this moment pedal control mechanism 8 continues down to step on, and the second micro-switch L2 connects, contactless switch Z energising, and the Z1 closing of contact, DC machine 3 and storage battery 1 energising, its starting duty first time is finished, and does not produce the big electric current of starting, only has load current.Because the contact self-locking of Z1, even pedal control mechanism 8 recovers incipient state, micro-switch L1, L2 throw off, and DC machine still remains in operation.So often there is not the problem of restarting in phase work, and reaches the generation that whole on period does not have the big electric current of starting.When the handling work of fork truck stops, only needing key switch Q to be disconnected contactless switch Z dead electricity, DC machine 3 stalls.Operating mode when needing potential energy to reclaim, its operation order is described identical with (2) (3) in aforementioned (two).
Another modified example of the present invention as shown in Figure 8.The starting of relevant DC machine 3 can be used one push start.For example come reduced voltage starting by manual control apparatus, methods such as crosstalk resistance reach the purpose of specified starting current.
DC machine 3 variable pump/motor 4 in long-term operation is to be in unloaded state.When operating mode needs pressure oil-source, make controllable capacity pump 4 that oil sources is provided by mechanisms such as pedal control mechanisms 8.After whole work period is finished when needing parking period longer (as a work team, or) cutting off the electricity supply gets final product.The operating mode here in fact only produces the big electric current of one push start.Reach purpose of energy saving equally, shown in Figure 8 have carry, underloading, unloaded decline energy recovery control step is as follows: hand change over valve 11 is in (C) position, under the effect of goods gravity, pressure oil in the oil cylinder 25 is flowed into to controllable capacity pump 4, under the effect of high pressure oil, make change-over valve 20 switch to (J) position, change-over valve 33 switches to (L) position, cut off the control oil channel of change-over valve 34, and make this control oil channel release.Low pressure accumulator 15 is in closes.At this moment pedal control mechanism 8 oppositely depresses, and making potential energy become hydraulic pressure can be to high pressure accumulator 23 storage.
When underloading, unloaded decline, the pressure in the oil cylinder 25 is less, and change-over valve 20 does not switch, and energy storage 23 is in closes, and change-over valve 33 is in (m) position, makes change-over valve 34 switch to (I) position.Fluid in the oil cylinder 25 flows to controllable capacity pump 4, and pedal control mechanism 8 oppositely depresses simultaneously, makes underloading or unloaded potential energy, stores to low pressure accumulator 15 by controllable capacity pump 4.Fill valve 32 is to prevent that controllable capacity pump 4 from inhaling empty when reverse output and establish, and the front that utilizes of the energy is stated.
The effect of invention
The oil pressure that the present invention has when potential energy and kinetic energy made reverse drive by the variable pump/motor can be stored in the energy storage; Though heavy duty, underloading, and unloaded potential energy all can be to two energy storage storages of high and low pressure; When hoist cylinder descends at light load, do not have the problem slowly that descends, this has just improved work efficiency; When the variable pump/motor is made forward drive, but all actv. utilizations of the energy low, a Senior Two energy storage storage reach purpose of energy saving; Energy storage drives DC machine to variable pump/motor oil transportation process, makes it not produce the big electric current of starting; Utilize this hydraulic control system only to make the big electric current of disposable starting, make the DC machine long-term operation, the same big electric current of starting that reduces reaches energy-conservation purpose; Because above-mentioned advantage makes storage battery prolong the life-span, has improved loading capacity, and loading and unloading operation efficient, save use cost.

Claims (15)

1, a kind of energy-saving control system of hydrostatic transmissions storage battery forktruck, the invention is characterized in that this system is made up of following elements: one and sharp DC motor, a variable pump/motor, pedal control mechanism, control apparatus, check valve of intake side configuration of variable pump/motor, two oil circuits of configuration between them, one the tunnel connects automatically controlled (or hydraulic control) bi-bit bi-pass change-over valve, low pressure accumulator.Another road connects a hydraulic control bi-bit bi-pass change-over valve, high pressure accumulator.The output circuit of variable pump/motor connects a Fill valve, connects the hydraulic control oil circuit of above-mentioned (or two) bi-bit bi-pass change-over valve.The output circuit of variable pump/motor also connects three hand change over valves, and they connect lift oil tank respectively, dump ram, walking HM Hydraulic Motor.
2, as described in the right (1), it is characterized in that well swashs the running of (or compounding) DC machine, form by two orders, supply pressure oil by low pressure accumulator to the sucking hole of variable pump/motor earlier, the variable pump/motor is made the motor operating mode, and drives the DC machine rotation, energized then, the cut off low energy storage is to variable pump/motor fuel feeding, and the starting current of DC machine is decided with load.
3, as described in the right (1), the Energy Saving Control hydraulic efficiency pressure system, its feature DC machine is the compounding DC machine.
4, as described in the right (1) (2), it is characterized in that and can be controlled by pedal control mechanism that turn round according to each operating mode starting, pedal control mechanism recovers the initial position, DC machine shuts down.
5, as described in the right (1) (2), its feature also can be by manual control apparatus step-down, and the series resistance starting DC machine is done disposable starting, and DC machine drives the long-term operation of variable pump/motor, and DC machine shuts down, and is switched by hand switch.
6, as described in right (1) (2), its feature also can be by the key switch closure, pedal control mechanism depresses the action of first micro-switch from the initial position, the magnet coil energising, electromagnetic valve switches, low pressure accumulator is to variable pump/motor fuel feeding, and the variable pump/motor is made the motor operating mode and driven the DC machine running, the speed switch action, second micro-switch continues action, the contactless switch action, the control circuit self-locking, storage battery is powered to DC machine, pedal control mechanism, even the recovery initial position, DC machine still remains in operation, and key switch disconnects, the contactless switch dead electricity, DC machine shuts down.
7, as described in the right (1), its feature also can be connected with DC machine by speed switch, and speed switch does not reach predetermined speed, the main power source no power, and DC machine does not turn round.
8, as described in the right (1) (2), the reclaimed oil pressure that it is characterized in that the hoist cylinder potential energy, be less than or equal to the setting pressure of high pressure (or low pressure) energy storage, also swashing under (or compounding) DC machine drive variable pump/motor rotation operating mode, the swash plate of regulated variable pump/motor, the speed that the may command hoist cylinder descends.
9, as described in the right (1), it is characterized in that the output of high pressure accumulator energy storage,, provide pressure oil to the sucking hole of variable pump/motor by the hydraulic control bi-bit bi-pass change-over valve control of adjustable pressure control.
10, as described in the right (1), it is characterized in that the variable pump/motor oppositely exports, Fill valve can prevent the suction sky of pump from the fuel tank repairing.
11, as described in the right (1), connect two check valves on the oil circuit of the HM Hydraulic Motor that it is characterized in that walking, make forward output and pressure valve, high pressure accumulator connects, the walking HM Hydraulic Motor, positive and negative braking can both be reclaimed kinetic energy.Its braking function can be made damped condition by the O type function of brake activation valve or hand change over valve.
12, as described in the right (1), it is characterized in that reverse pedal gear is equipped with spacing adjusting bolt, place restrictions on the angle of reverse pedal gear, the regulated variable pump/motor is oppositely exported.
13, as described in the right (1), it is characterized in that also can be in heavily loaded potential energy descends, and the hoist cylinder internal pressure is higher, and the hydraulic control bi-bit bi-pass change-over valve of control high pressure accumulator switches, and connects high pressure accumulator.The two position three-way valve of hydraulic control simultaneously switches, and makes the two position three-way valve control oil channel release of control low pressure accumulator, and low pressure accumulator is closed.Pedal control mechanism oppositely depresses, and the variable pump/motor is oppositely exported.Pedal control mechanism restores, and the variable pump/motor is in meta, and oppositely exporting discharge capacity is zero.
14, as described in the right (1), its feature also can be in underloading, the unloaded potential energy that descends reclaims, the pressure of hoist cylinder is less than or equal to the low pressure accumulator setting pressure, the bi-bit bi-pass change-over valve switches, and connects low pressure accumulator, and pedal control mechanism oppositely depresses, the variable pump/motor is oppositely exported, the low pressure accumulator energy storage.Pedal control mechanism restores, and the variable pump/motor is in meta, and oppositely exporting discharge capacity is zero.
15, as described in the right (1), its feature also can connect the walking HM Hydraulic Motor at hand change over valve, when making coasting mode, can be undertaken by the y-function of hand change over valve.
CN 90215492 1990-11-21 1990-11-21 Fork lift truck energy-saving hydraulic control system Withdrawn CN2076972U (en)

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CN 90215492 CN2076972U (en) 1990-11-21 1990-11-21 Fork lift truck energy-saving hydraulic control system

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Application Number Priority Date Filing Date Title
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CN111396378A (en) * 2020-04-09 2020-07-10 大连理工大学 Motor-driven hydraulic system for crane luffing mechanism and method of operation thereof
US10844885B2 (en) 2016-07-07 2020-11-24 Dana Italia S.R.L. System for recovering energy from a hydraulic actuator

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CN101027244B (en) * 2004-09-23 2011-06-15 克朗设备公司 Materials handling vehicle comprising an electronically controlled valve
WO2006081745A1 (en) * 2005-02-06 2006-08-10 Yangdong He A hydraulic auxiliary system with an accumulator increasing flow for a concrete pump
CN100577555C (en) * 2006-04-19 2010-01-06 浙江佳力科技股份有限公司 Full hydraulic electric forklift electric system
CN101558245B (en) * 2006-12-11 2011-06-15 舍弗勒技术两合公司 Hydraulic circuit arrangement for controlling a hybrid clutch and an automatic gearbox on a motor vehicle
CN102105727B (en) * 2008-06-25 2013-08-21 巴斯夫欧洲公司 Method for safely preventing backflowing in the conveying of a fluid
CN102792045A (en) * 2009-12-03 2012-11-21 卡特彼勒环球矿业有限责任公司 Hydraulic reservoir for hydraulic regenerative circuit
CN102792045B (en) * 2009-12-03 2014-12-03 卡特彼勒环球矿业有限责任公司 Hydraulic reservoir, hydraulic system and operation method for hydraulic regenerative circuit
CN102241379B (en) * 2010-05-13 2014-05-07 济南谨恒节能技术有限公司 Energy-saving travelling type hydraulic transport machine
WO2011140972A1 (en) * 2010-05-13 2011-11-17 济南谨恒节能技术有限公司 Traveling hydraulic handling machine of energy-saving type
CN102241379A (en) * 2010-05-13 2011-11-16 济南谨恒节能技术有限公司 Energy-saving travelling type hydraulic transport machine
CN102336372A (en) * 2010-07-16 2012-02-01 徐州重型机械有限公司 Hydraulic control system of crane and winch device of crane
CN101955139A (en) * 2010-09-14 2011-01-26 三一集团有限公司 Energy-saving stacking machine
CN102092662A (en) * 2010-12-15 2011-06-15 三一集团有限公司 Lifting hydraulic system and lifting machine with hydraulic system
CN102092662B (en) * 2010-12-15 2012-12-19 三一集团有限公司 Lifting hydraulic system and lifting machine with hydraulic system
CN102134047A (en) * 2011-02-15 2011-07-27 安徽合力股份有限公司 Energy-saving hydraulic system of electric forklift
CN103403360A (en) * 2011-02-23 2013-11-20 舍弗勒技术股份两合公司 Hydraulic device for actuating a clutch
CN102536931A (en) * 2011-12-23 2012-07-04 航天长征化学工程股份有限公司 Reversal hydraulic driving system of raking machine
CN102602852A (en) * 2012-03-23 2012-07-25 三一集团有限公司 Hydraulic hybrid stacking machine
CN102602852B (en) * 2012-03-23 2014-09-10 三一集团有限公司 Hydraulic hybrid stacking machine
CN102758813A (en) * 2012-08-01 2012-10-31 三一重工股份有限公司 Energy-recovery hydraulic system and engineering machinery
CN102758813B (en) * 2012-08-01 2014-12-31 三一重工股份有限公司 Energy-recovery hydraulic system and engineering machinery
CN102900715B (en) * 2012-10-08 2015-06-24 北京索普液压机电有限公司 Hydraulic control system for forklift, and forklift
CN102900715A (en) * 2012-10-08 2013-01-30 北京索普液压机电有限公司 Hydraulic control system for forklift, and forklift
CN103693034A (en) * 2013-07-15 2014-04-02 南京工程学院 Electro-hydraulic proportional valve control pump/motor hydraulic power assisted system of electric automobile
CN104828748A (en) * 2015-04-03 2015-08-12 柳州柳工叉车有限公司 Forklift hydraulic energy recovery device
CN105197840A (en) * 2015-04-16 2015-12-30 上海市闸北区物流工程技术研究所 Electric control hydraulic driving system for industrial vehicle
CN105197840B (en) * 2015-04-16 2018-11-20 上海市闸北区物流工程技术研究所 A kind of Electro-hydraulic drive system for industrial vehicle
CN105621322A (en) * 2016-02-24 2016-06-01 上海市闸北区物流工程技术研究所 Full-hydraulic electric stacking forklift
US10844885B2 (en) 2016-07-07 2020-11-24 Dana Italia S.R.L. System for recovering energy from a hydraulic actuator
CN111396378A (en) * 2020-04-09 2020-07-10 大连理工大学 Motor-driven hydraulic system for crane luffing mechanism and method of operation thereof
CN111396378B (en) * 2020-04-09 2021-03-26 大连理工大学 Motor-driven hydraulic system for crane luffing mechanism and method of operation thereof

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