CN100386254C - Electric fork track lifting control system possessing energy recovery device - Google Patents
Electric fork track lifting control system possessing energy recovery device Download PDFInfo
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- CN100386254C CN100386254C CNB2006100426033A CN200610042603A CN100386254C CN 100386254 C CN100386254 C CN 100386254C CN B2006100426033 A CNB2006100426033 A CN B2006100426033A CN 200610042603 A CN200610042603 A CN 200610042603A CN 100386254 C CN100386254 C CN 100386254C
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Abstract
The present invention discloses a lifting control system of an electric forkman with the function of energy recovery, which comprises a motor, a pump motor, an oil complement device, an electrohydraulic servo valve, a lifting oil cylinder, a control device and an accumulator. The motor is used for driving the pump motor in a hydraulic system, and the electrohydraulic servo valve is used for controlling the actions of an actuating mechanism and the lifting oil cylinder under the functions of the control device. The control system makes the motor work in a regenerative braking mode during the process of the ascension, the descension and the retardment of the lifting oil cylinder except that the control system has the driving and controlling functions of the actuating mechanism and the lifting oil cylinder, and the control system is used for recovering braking energy through a boosted circuit, and the braking energy is stored in the accumulator. The potential energy of heavy objects is used for driving the motor to reverse through a hydraulic pump motor in the process that the heavy objects and loads are slammed down, the motor is in an electricity generating state in work inversing condition, and the potential energy of the heavy objects is transformed into electric energy to be stored in the accumulator. Thereby, the control system not only can implement the recovery of the kinetic energy of the electric forkman, but also can implement the recovery of the potential energy generated by the falling of the heavy objects. The present invention has the advantages of simple structure, low cost and immense economic value.
Description
Technical field
The invention belongs to electri forklift lifting device control field, relate in particular to electric regenerative electri forklift lifting control system, this system can reclaim the braking energy of control electri forklift lifting device braking procedure and the weight potential energy of weight decline process.
Background technology
In recent years, development along with industrial technology in the world wide, energy shortage and problem of environmental pollution are serious day by day, sub-technology of this current collection of electri forklift and hydraulic technique are maked rapid progress in the product of one, electri forklift accounts for 50～60% of recoverable amount in market abroad at present, and the present recoverable amount of China accounts for 15～20%, broad market prospect.The electri forklift lifting device adopts the type of drive of motor-hydraulic efficiency pressure system-hydraulic actuating cylinder more, and its shortcoming is that efficient is low, and energy consumption is big, and the electri forklift power saving has been subjected to the extensive concern of industry.The characteristics of electri forklift elevating ram are that crank motion is frequent, lifting and transfer weight repeatedly, and hoisting force is bigger, and often bears negative value load.In the weight decline process, its gravitional force and kinetic energy all are converted into the throttle loss of hydraulic efficiency pressure system, not only cause the waste of the energy, also can cause hydraulic efficiency pressure system heating, noise and vibration.Or even harm such as initiating system fault and reduction system life.Energy recovery technology in recent years becomes an energy-conservation primary study direction of hydraulic efficiency pressure system.The rated load, nominal load of hoisting system is 6: 1 to 8: 1 with the ratio of minimum load in addition, and no-load speed should be higher than full-load speed according to reason.Electri forklift is regulated hoisting speed and is taked throttling governing mostly at present, causes the hydraulic efficiency pressure system operating efficiency low, and degradation of energy is big.Power of motor can not make full use of, and the no-load speed and the full-load speed of fork truck are basic identical, promotes efficient and awaits improving.
Summary of the invention
Defective and deficiency at above-mentioned prior art existence, the invention reside in provides electric regenerative electri forklift lifting control system, this system is in the rising of lifting device actuating unit hydraulic ram and decline braking procedure of electri forklift, control system makes machine operation in the regenerative brake state, and electric energy feedback that regenerative brake produced and be stored in the storage battery.And transfer in the process when weight load, weight potential energy drives the motor counter-rotating by Hydraulic Pump-motor, makes motor be in anti-operating mode generating state.The potential energy of weight is converted into power storage in storage battery.Electri forklift is realized dual speed governing in actuating unit elevating ram drive controlling in addition, high response accuracy of comprehensive application valve control system and the high efficiency advantage of pump control system.
For achieving the above object, the technical solution used in the present invention is: a kind of electric regenerative electri forklift lifting control system is characterized in that this system comprises motor, pump-motor, recharging oil device, electrohydraulic servo valve, elevating ram, control setup, storage battery; Motor links to each other with the cooresponding pump-motor of two cavity areas of oil cylinder with discharge capacity; The T mouth of electrohydraulic servo valve links to each other with oil suction with the oil discharge outlet of pump-motor respectively with the P mouth, and the A mouth of electrohydraulic servo valve links to each other with rod chamber with the rodless cavity of elevating ram respectively with the B mouth; Recharging oil device is connected pump-motor oil discharge outlet and oil suction, and links to each other with the T mouth with the P mouth of electrohydraulic servo valve; Control setup links to each other with the lifting motor with storage battery through being electrically connected respectively, and links to each other with first signal transducer that is provided with on the secondary signal sensor that is provided with and the motor on the control signal interface of electrohydraulic servo valve, the elevating ram respectively by the control signal connection lead.
Described control setup comprises control circuit board and motor-driven DC/DC changer, wherein control circuit board comprises filter circuit, microprocessor, photoelectric isolating circuit and power driving circuit, control circuit board is by input filter circuit acquisition instructions signal and first, second sensor signal, microprocessor carries out data handing after the photoelectric isolating circuit output pwm signal to the signal that collects, one group links to each other with the control signal interface of electrohydraulic servo valve, and another group links to each other through the control end of power driving circuit with each power device of motor-driven DC/DC changer.
The technique effect that the present invention brings is:
1) adopts dual speed-regulating scheme, when control signal hour, control setup is by the opening amount of PWM waveform adjustment electrohydraulic servo valve, realize the High Accuracy Control of valve control system, when control signal is big, control setup is regulated motor speed by the PWM mode of speed control, and the execution speed of the discharge capacity regulator solution compressing cylinder by pump-motor is realized the high efficiency control of pump control system.Can satisfy like this and realize permanent torque adjustment under the command speed, and above rating horsepower the time, realize permanent power regulation, the hoisting speed when adjusting is fully loaded and unloaded respectively, the operating efficiency of raising fork truck.
2) native system needn't increase electrical generator and energy-storage travelling wave tube, can realize that the recover kinetic energy of actuating unit and weight potential energy reclaim.In the elevating ram lifting with transfer in the weight moderating process, control setup makes machine operation in the regenerative brake pattern, by motor-driven DC/DC converter boost circuit braking energy is reclaimed, and is stored in the storage battery.In addition when elevating ram is transferred the heavier load weight, the feedback dynamic brake principle of utilizing motor reclaims the decline potential energy of weight, and is stored in the storage battery.Because feedback energy is stored in the storage battery, has increased substantially the period of service of storage battery, has reduced the throttle loss of system simultaneously, has improved the work efficiency of system.
Description of drawings
Fig. 1 is an electric regenerative electri forklift lifting control system constructional drawing of the present invention, and system is by motor 1, pump-motor 2, and recharging oil device 3, electrohydraulic servo valve 4, elevating ram 5, control setup 6, storage battery 7 is formed.
Fig. 2 is the control setup schematic diagram;
Fig. 3 is an elevating ram lifting weight drive current directional pattern.
Fig. 4 is elevating ram lifting weight braking energy feedback direction of current figure.
Fig. 5 is that elevating ram is transferred than weight thing drive current directional pattern.
Fig. 6 is that elevating ram is transferred than weight thing braking energy feedback and transferred more heavy thing potential energy feedback direction of current figure.
Below in conjunction with accompanying drawing and example the present invention is described in further detail.
The specific embodiment
The present invention includes permanent-magnet brushless DC electric machine 1, pump-motor 2, recharging oil device 3, electrohydraulic servo valve 4, elevating ram 5, control setup 6, lead-acid storage battery 7.Its interconnected relationship is as follows:
1) permanent-magnet brushless DC electric machine 1 links to each other with the cooresponding pump-motor 2 of elevating ram two cavity areas with discharge capacity.
2) the P mouth of electrohydraulic servo valve 4 links to each other with oil suction with the oil discharge outlet of pump-motor 2 respectively with the T mouth, and the A mouth of electrohydraulic servo valve 4 links to each other with rod chamber with the rodless cavity of elevating ram 5 respectively with the B mouth.Recharging oil device 3 is connected pump-motor 2 oil discharge outlets and oil suction, and links to each other with the T mouth with the P mouth of electrohydraulic servo valve 4;
3) control setup 6 links to each other with storage battery 7 with motor 1 respectively through electrical cable.Control setup 6 through the control signal connection lead respectively with the control signal interface of electrohydraulic servo valve 4, first signal transducer on the motor 1 links to each other with secondary signal sensor on the elevating ram 5.
Control setup comprises control circuit board and motor-driven DC/DC changer.Control circuit board comprises filter circuit as shown in Figure 2, microprocessor, photoelectric isolating circuit and power driving circuit.Microprocessor adopts DSP, and the filter circuit that filter circuit adopts representative type to be built by op amp, photoelectric isolating circuit are realized that by optocoupler power driving circuit adopts modular design.The required various level of control setup are provided through common DC/DC Switching Power Supply coupling by storage battery power supply.For permanent-magnet brushless DC electric machine, motor-driven DC/DC changer is made up of six power devices in the control setup, power device VT1 and VT4, VT3 and VT6, VT2 and VT5 form the driving half-bridge respectively and constitute three phase inverter bridge, the two ends and the storage battery of three phase inverter bridge are connected in parallel, VT1 and VT4, VT3 and VT6, the centre of VT2 and VT5 is connected with machine winding respectively.
Principle of work of the present invention is as follows:
Control circuit board is through the signal of input filter circuit reception command signal and first, second sensor, and signal comprises electric moter voltage, current signal and hydraulic ram speed, displacement signal.Microprocessor carries out data handing after the photoelectric isolating circuit output pwm signal to acquired signal.One group of pwm signal is directly connected to the control signal interface of electrohydraulic servo valve, the opening amount of control electrohydraulic servo valve, the High Accuracy Control of realization valve control system.Another group pwm signal is realized motor-driven and control of braking through the action of each power device of power driving circuit control motor-driven DC/DC changer.During motor-driven, the DC/DC changer works in decompression mode, and by regulating pwm signal duty cycle adjustment motor speed, because motor is connected with pump-motor is coaxial, corresponding change pump-motor displacement is realized the high efficiency control of pump control system.During motor braking, the DC/DC changer works in boost mode, and corresponding adjusting pwm signal duty cycle adjustment motor braking moment realizes motor regenerative brake and anti-operating mode dynamic brake.Therefore native system can be realized the dual speed control of actuating unit on the one hand, comprehensive application high response accuracy of valve control system and the high efficiency advantage of pump control system; Can realize the electri forklift recover kinetic energy on the other hand, can realize that also weight potential energy reclaims.
When actuating unit elevating ram 5 lifting weights drive, this moment, the DC/DC changer worked in decompression mode, and motor 1 works in first quartile, and storage battery 7 electric currents flow into motor 1 through DC/DC changer positive, drive the rotation of motor 1 positive dirction, direction of current as shown in Figure 3.Control setup 6 is further regulated the dual speed control that the pwm signal dutycycle realizes elevating ram 5 according to command signal and sensor signal.
When actuating unit elevating ram 5 lifting weight glancing impacts, the DC/DC changer works in boost mode, motor 1 works in second quadrant, this moment is because the afterflow effect of motor 1 winding inductance, motor 1 regenerating braking energy feeds back in the storage battery 7 through the conversion of DC/DC converter boost, direction of current is regulated pwm signal duty cycle adjustment lock torque as shown in Figure 4.
When actuating unit elevating ram 5 is transferred than the weight thing, because weight load is not enough to overcome systemic resistance and drags 2 counter-rotatings of pump-motor, weight load must be transferred through motor 1 driving pump-motor 2, this moment, the DC/DC changer worked in decompression mode, motor 1 works in third quadrant, battery 7 electric currents drive motor 1 opposite spin through the anti-phase inflow motor 1 of DC/DC changer, and direction of current as shown in Figure 5.
When actuating unit elevating ram 5 is transferred than weight thing glancing impact, the DC/DC changer works in boost mode, motor 1 works in four-quadrant, this moment is because the afterflow effect of motor 1 winding inductance, motor 1 regenerating braking energy feeds back in the storage battery 7 through the conversion of DC/DC converter boost, and direction of current as shown in Figure 6.
When actuating unit elevating ram 5 is transferred more heavy thing, weight load is enough to overcome systemic resistance, hydraulic actuating cylinder 5 drags 2 rotations of pump-motor under the weight loading, drive motor 1 counter-rotating simultaneously, make motor 1 work in anti-operating mode generating state, electric energy is fed back in the storage battery 7, realize the recovery of weight potential energy.Control the ON time of DC/DC inverter power device this moment, i.e. the size of the lock torque of may command motor 1 and feedback electric current guarantees the lowering velocity of actuating unit, and direction of current as shown in Figure 6.
Claims (4)
1. an electric regenerative electri forklift lifting control system is characterized in that, this system comprises motor (1), pump-motor (2), recharging oil device (3), electrohydraulic servo valve (4), elevating ram (5), control setup (6), storage battery (7); Motor (1) links to each other with the cooresponding pump-motor of two cavity areas (2) of oil cylinder with discharge capacity; The T mouth of electrohydraulic servo valve (4) links to each other with oil suction with the oil discharge outlet of pump-motor (2) respectively with the P mouth, and the A mouth of electrohydraulic servo valve (4) links to each other with rod chamber with the rodless cavity of elevating ram (5) respectively with the B mouth; Recharging oil device (3) is connected pump-motor (2) oil discharge outlet and oil suction, and links to each other with the T mouth with the P mouth of electrohydraulic servo valve (4); Control setup (6) links to each other with lifting motor (1) with storage battery (7) respectively through electrical cable, and links to each other with first signal transducer that motor (1) is gone up setting with the control signal interface of electrohydraulic servo valve (4), the secondary signal sensor that elevating ram (5) is gone up setting respectively by the control signal connection lead;
Described control setup (6) comprises control circuit board and motor-driven DC/DC changer, wherein control circuit board comprises filter circuit, microprocessor, photoelectric isolating circuit and power driving circuit, control circuit board is by input filter circuit acquisition instructions signal and first, second sensor signal, microprocessor carries out data handing after the photoelectric isolating circuit output pwm signal to the signal that collects, one group links to each other with the control signal interface of electrohydraulic servo valve, and another group links to each other through the control end of power driving circuit with each power device of motor-driven DC/DC changer.
2. electric regenerative electri forklift lifting control system as claimed in claim 1 is characterized in that described motor (1) is permanent-magnet brushless DC electric machine or permanent magnet brush DC machine.
3. the electri forklift lifting control system with energy recovery as claimed in claim 1 is characterized in that described storage battery (7) is lead-acid battery or lithium cell or Ni-MH battery.
4. electric regenerative electri forklift lifting control system as claimed in claim 4, it is characterized in that for permanent-magnet brushless DC electric machine, motor-driven DC/DC changer is made up of six power devices in the control setup, power device VT1 and VT4, VT3 and VT6, VT2 and VT5 form the driving half-bridge respectively and constitute three phase inverter bridge, the two ends and the storage battery of three phase inverter bridge are connected in parallel, VT1 and VT4, VT3 and VT6, the centre of VT2 and VT5 is connected with machine winding respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100426033A CN100386254C (en) | 2006-03-31 | 2006-03-31 | Electric fork track lifting control system possessing energy recovery device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100426033A CN100386254C (en) | 2006-03-31 | 2006-03-31 | Electric fork track lifting control system possessing energy recovery device |
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| CN1830750A CN1830750A (en) | 2006-09-13 |
| CN100386254C true CN100386254C (en) | 2008-05-07 |
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| CNB2006100426033A Expired - Fee Related CN100386254C (en) | 2006-03-31 | 2006-03-31 | Electric fork track lifting control system possessing energy recovery device |
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| US8689943B2 (en) | 2010-03-01 | 2014-04-08 | The Raymond Corporation | Energy storage on an elevated platform and transfer method |
| US8869944B2 (en) | 2010-03-01 | 2014-10-28 | The Raymond Corporation | Energy storage on an elevated platform and transfer method |
| CN102092662B (en) * | 2010-12-15 | 2012-12-19 | 三一集团有限公司 | Lifting hydraulic system and lifting machine with same |
| CN102108948B (en) * | 2010-12-28 | 2012-11-28 | 山河智能装备股份有限公司 | Renewable energy power generating system applicable to electrocar for loading, unloading and transporting |
| CN102730604A (en) * | 2012-06-18 | 2012-10-17 | 三一集团有限公司 | Tandem hybrid fork lift truck |
| CN103359619B (en) * | 2013-07-22 | 2015-08-05 | 上海港机重工有限公司 | Adopt all electric container in hoisting status machine of centralized drive axle |
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| CN104495697B (en) * | 2014-12-12 | 2017-01-11 | 牛力机械制造有限公司 | Automatic charging mechanism for prolonging working time of storage battery of electric fork lift truck |
| CN104555741B (en) * | 2014-12-31 | 2016-10-05 | 中联重科股份有限公司 | A kind of rotary drilling rig master winch control system and rotary drilling rig |
| CN105236317A (en) * | 2015-11-12 | 2016-01-13 | 潍柴动力股份有限公司 | Electric fork-lift truck, potential energy recycling system and method thereof |
| CN105697429B (en) * | 2015-12-22 | 2017-08-08 | 徐州重型机械有限公司 | Energy recovery control system and crane gear |
| CN107032265B (en) * | 2017-05-04 | 2018-11-09 | 西华大学 | A kind of direct electric drive pump control energy conserving system for double mast forklift trucks |
| CN111555376A (en) * | 2020-04-08 | 2020-08-18 | 江苏快乐电源(涟水)有限公司 | Electric forklift energy recovery system for guaranteeing thermal balance of battery |
| CN113148914B (en) * | 2021-01-29 | 2023-12-29 | 华侨大学 | Forklift potential energy recovery and release integrated device and working method |
| CN113213381A (en) * | 2021-05-25 | 2021-08-06 | 上海市特种设备监督检验技术研究院 | Online monitoring system for pallet fork energy efficiency of electric forklift |
| CN113339334A (en) * | 2021-06-02 | 2021-09-03 | 捷尔杰（天津）设备有限公司 | Potential energy recovery system of aerial work platform |
| CN113526413B (en) * | 2021-07-20 | 2022-10-25 | 宁波如意股份有限公司 | Forklift lifting device and power generation efficiency control method thereof |
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