CN208279268U - A kind of fork truck energy saving system with speed-regulating function - Google Patents
A kind of fork truck energy saving system with speed-regulating function Download PDFInfo
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- CN208279268U CN208279268U CN201721849466.4U CN201721849466U CN208279268U CN 208279268 U CN208279268 U CN 208279268U CN 201721849466 U CN201721849466 U CN 201721849466U CN 208279268 U CN208279268 U CN 208279268U
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- 230000002457 bidirectional effect Effects 0.000 claims abstract description 39
- 230000003028 elevating effect Effects 0.000 claims abstract description 35
- 238000004146 energy storage Methods 0.000 claims abstract description 26
- 230000007423 decrease Effects 0.000 claims abstract description 24
- 239000007788 liquid Substances 0.000 claims abstract description 20
- 239000013589 supplement Substances 0.000 claims abstract description 15
- MFOUDYKPLGXPGO-UHFFFAOYSA-N propachlor Chemical compound ClCC(=O)N(C(C)C)C1=CC=CC=C1 MFOUDYKPLGXPGO-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000003921 oil Substances 0.000 claims description 45
- 239000010720 hydraulic oil Substances 0.000 claims description 29
- 239000003990 capacitor Substances 0.000 claims description 27
- 239000004065 semiconductor Substances 0.000 claims description 19
- 230000005611 electricity Effects 0.000 claims description 7
- 238000009355 double cropping Methods 0.000 claims description 5
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- 238000005381 potential energy Methods 0.000 abstract description 23
- 238000011084 recovery Methods 0.000 abstract description 9
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- Forklifts And Lifting Vehicles (AREA)
Abstract
The utility model provides a kind of fork truck energy saving system with speed-regulating function, including double acting electric motor-generator, double acting pump-motor, seal-off pressure oil tank, liquid-controlled oil supplement valve, bidirectional hydraulic locking-valve, elevating ram, safety valve, three-phase bridge type converter, energy supply-energy storage device, control device, fuel tank；Double acting pump-motor is connected with double acting electric motor-generator；Double acting electric motor-generator is connected with three-phase bridge type converter；Three-phase bridge type converter is connected with energy supply-energy storage device；Control device controls three-phase bridge type converter and energy supply-energy storage device working condition；The oil discharge outlet and inlet port of double acting pump-motor are connected with liquid-controlled oil supplement valve；Liquid-controlled oil supplement valve is connected with bidirectional hydraulic locking-valve, and bidirectional hydraulic locking-valve is connected with elevating ram rod chamber and rodless cavity；Elevating ram rod chamber and rodless cavity are connected with safety valve.The potential energy recovery system of the utility model passes through control double acting electric motor-generator rotational speed regulation pallet fork decrease speed, hydraulic circuit restriction loss is eliminated, hydraulic heating of oil is reduced, improves potential energy recovery efficiency, and system hardware and software is simple and reliable, it can be achieved that degree is high.
Description
Technical field
The utility model relates to a kind of fork truck energy conserving system, in particular to a kind of fork truck with speed-regulating function is energy-efficient
System.
Background technique
In recent years, Logistics Industry scale grows continuously and fast, and social logistics total cost accounts for GDP specific gravity and remains high, fork
Vehicle carries equipment as the core of logistics, is of great significance to ensureing conevying efficiency, enhancing economic strength.The whole world in 2015
Fork truck total sales volume 106.42 ten thousand, China's fork truck sales volume 32.76 ten thousand accounts for total sales volume ratio 30.7%, ranks the world within continuous 7 years
First big fork truck consumption market.But in forklift truck products, since industry is started late, electri forklift sales volume accounts for fork truck pin in China
20% or so of amount, the market accounting rate of the electri forklifts such as this and America and Europe, Japan 60% still has larger gap.And electri forklift due to
The features such as self-pollution is small, low noise, following electri forklift pin huge in industry markets spaces such as warehouse logistics, food medicine
Amount accounting will be promoted gradually.Electri forklift has many advantages, such as, but it is to restrict electri forklift shift that cruise duration is short
Key factor.The frequent cargo lifting of electri forklift hoisting system, consumes big energy, accounts for vehicle energy consumption than nearly 50%, and frequent
Cargo decline in terms of potential energy recycling with great potential.The aspect of electri forklift potential energy recycling at this stage, in addition to present is ground
Study carefully hot spot, recycles how decline potential energy further improves gesture on the basis of energy storage device to greatest extent using energy storage device
Energy recovery efficiency, is present research emphasis, and research weak link.In terms of electri forklift potential energy recovery efficiency, liquid
The restriction loss that the electrohydraulic servo valve of pallet fork decrease speed is adjusted in pressure system, not only directly results in Hydraulic System Fever,
It is the low key factor of losses of potential energy, potential energy recovery efficiency, therefore reduces restriction loss, to improves fork truck potential energy recovery efficiency tool
It is significant.Furthermore electri forklift energy storage device multiselect lead-acid accumulator energy storage, and fork of forklift truck decline process usually exists
Between more than ten seconds to tens seconds, lead-acid accumulator power density is low, and quick charge is difficult in the short time, is unable to high efficiency recycling goods
Fork decline potential energy.
For electri forklift potential energy recovery system, the prior art is as follows:
By taking Chinese patent 200610042603.3 as an example, adjusted by electrohydraulic servo valve and generator-motor pump control system
Pallet fork decrease speed needs to control the operating configurations of motor, revolution speed and electrohydraulic servo valve, i.e. motor, pump, electromagnetic servo simultaneously
The real-time high-precision of valve matches, and requires high to system hardware and software equipment, it can be achieved that property requires height.
By taking Chinese patent 201210128114.5 as an example, energy regeneration and recycling are realized by multi-way valve, but multi-way valve
Structure is complicated, and oil circuit is more, and forklift steering system and hoisting system are designed in a hydraulic system, hydraulic circuit change variation
Greatly, operation complexity is high.
By taking Chinese patent 201620398878.X as an example, electri forklift is realized by throttle grverning and variable speed volumetric speed control
Potential energy recycling, but hydraulic system hand-operated direction valve control precision is low, throttle grverning energy loss is big, also results in hydraulic fry dried food ingredients
Heat reduces system effectiveness.
Summary of the invention
In view of the deficiency of the prior art, the utility model lies in that providing has pallet fork speed-regulating function, normal work
There is no the electri forklift energy saving system of restriction loss under condition.
The utility model solves technical solution used by above-mentioned technical problem: a kind of fork truck with speed-regulating function is high
Imitate energy conserving system, including double acting motor, double acting motor, bidirectional hydraulic locking-valve, elevating ram, three-phase bridge type converter, confession
It can energy storage device and control device；Double acting motor is connected with double acting motor, the oil discharge outlet and inlet port of double acting motor with
Bidirectional hydraulic locking-valve is connected；Bidirectional hydraulic locking-valve is connected with the rod chamber of elevating ram and rodless cavity respectively；Control device includes
Control chip and auxiliary circuit, double acting motor are connected with three-phase bridge type converter, three-phase bridge type converter and energy supply energy storage dress
Set the working condition connected, control device is respectively connected to three-phase bridge type converter and energizes energy storage device and both control.
Further, control device receives the acquisition signal of current sensor, voltage sensor and speed encoder, output
Pwm signal controls the turn-on and turn-off condition of metal-oxide-semiconductor in three-phase bridge type converter, relay in control energy supply energy storage device
Turn-on and turn-off condition, current sensor are mounted on U, V phase in the three-phase wire of three-phase inverter, and voltage sensor is mounted on
The output end of super capacitor and battery, speed encoder are mounted on double acting motor output shaft.
Further, control chip is ATMEGA328P-PU chip.
Further, which further includes liquid-controlled oil supplement valve and seal-off pressure oil tank, seal-off pressure oil tank and hydraulic control repairing
Valve is connected, and liquid-controlled oil supplement valve is connected in parallel on the oil outlet and inlet port of double acting motor, and the hydraulic oil of seal-off pressure oil tank passes through liquid
Two check valves for controlling Fill valve can be respectively to the oil outlet of double acting motor and inlet port fuel feeding.
Further, which includes safety valve, and safety valve is made of two overflow valves, two overflow valves respectively with lifting
Cylinder rod chamber is connected with rodless cavity.
Further, double acting motor includes motor and generator, exports electric energy when double acting motor rotates forward, works as motor
It is produced electricl energy when reversion.
Further, double acting motor includes motor and pump, generates attraction when double acting motor rotates forward, works as double acting
Motor generates thrust when inverting.
Further, when hydraulic oil flows into bidirectional hydraulic locking-valve left side hydraulic control one-way valve, oil pressure cntrol bidirectional hydraulic locking-valve
The right hydraulic control one-way valve is reversely opened, and the hydraulic oil into elevating ram rodless cavity pushes elevating ram rod chamber hydraulic oil to pass through
Hydraulic control one-way valve on the right of two-way locking-valve, flows back to double acting motor；When hydraulic oil flows into hydraulic control one-way valve on the right of bidirectional hydraulic locking-valve,
Oil pressure cntrol bidirectional hydraulic locking-valve left side hydraulic control one-way valve is reversely opened, and the hydraulic oil into elevating ram rod chamber pushes lifting
Oil cylinder rodless cavity hydraulic oil flows back to double acting motor by two-way locking-valve left side hydraulic control one-way valve.
Further, when pallet fork decrease speed is excessively slow, current sensor and speed encoder on generator are by generator
Working speed, torque conditions are transmitted to control device, and control device compares generator actual speed signal with given rotating speed, adjust
Metal-oxide-semiconductor switching sequence increases double acting electric motor-generator revolving speed, reduces the torque of double acting electric motor-generator, reduces double acting
Pump-motor torque reduces hydraulic system and declines resistance, and hydraulic oil accelerates stream by the hydraulic control one-way valve on the right of bidirectional hydraulic locking-valve
Enter elevating ram rod chamber, while the hydraulic control one-way valve reverse opening on the hydraulic control bidirectional hydraulic locking-valve left side, elevating ram without
Rod cavity hydraulic oil flows back to double-acting pump-motor by the hydraulic control one-way valve quickening on the bidirectional hydraulic locking-valve left side, and then accelerates pallet fork
Decrease speed.
The beneficial effects of the utility model are: the pump that 1. the utility model are made up of double acting motor, double acting motor
Control system avoids valve control system to control pallet fork decrease speed using Direct Torque technical controlling double acting motor speed
Complicated speed regulation process, control device is simple, not high to system hardware and software requirement, it can be achieved that property is high.2. the utility model
The pump control system being made up of double acting motor, double acting motor, instead of controlling the electro-hydraulic of pallet fork decrease speed in original system
Servo valve eliminates restriction loss under system nominal situation, improves potential energy recovery efficiency, further extends the charge and discharge of battery single
Electricity uses the time, extends fork truck storage battery cruise duration；3. the utility model passes through bidirectional hydraulic locking-valve, liquid-controlled oil supplement valve, double
The potential energy recovery system with pallet fork speed-regulating function of motor, double acting motor composition is acted on, oil circuit is simple, and control is simple, behaviour
It is convenient, it can be achieved that property height to make practice；4. in the present invention, super capacitor power density is high, goods is recycled by super capacitor
Fork decline potential energy, fast charging and discharging performance is, it can be achieved that the high efficiency of short time internal potential energy recycles, and can be electri forklift raising
System provides raising moment electric energy, smooth battery output power, increasing storage battery service life.5. the utility model is in electric current
Sensor, which is mounted in three-phase inverter, installs current sensor, installs voltage sensor in the output end of super capacitor and battery
Device acquires current signal, super capacitor and the storage of three-phase inverter in double acting motor output shaft installation speed encoder in real time
The voltage signal of battery and the tach signal of motor output shaft are simultaneously sent to control system, and control system is according to above-mentioned signal energy
The enough speed obtained to the raising and lowering of pallet fork, and oil circuit is adjusted in the switching sequence by adjusting metal-oxide-semiconductor, thus real
Now adjust the purpose of the pallet fork speed of service, easy to operate, the precise control of the utility model.
Detailed description of the invention
Fig. 1 is the entire block diagram of the utility model.
Fig. 2 is the energy supply-energy storage device schematic diagram of the utility model, and in figure, A1 indicates that battery, A2 indicate super electricity
Hold, A3 indicates that first voltage sensor, A4 indicate that second voltage sensor, A5 indicate that the first relay, A6 indicate the second relay
Device.
Fig. 3 is the three-phase bridge type converter schematic diagram of the utility model, and in figure, B1 indicates the first current sensor, B2 table
Show that the second current sensor, B3, B5, B7, B9, B11, B13 indicate that metal-oxide-semiconductor, B4, B6, B8, B10, B12, B14 indicate diode,
B15, B16, B17 indicate resistance.
Fig. 4 is the control device schematic diagram of the utility model.
Specific embodiment
The technical solution of the utility model is described specifically with reference to embodiments, embodiment is only used for further illustrating
The utility model, and the restriction not to the utility model.
Referring to attached drawing 1, the utility model provides a kind of fork truck energy saving system with speed-regulating function, including double acting
Motor 1, double acting motor 2, seal-off pressure oil tank 8, liquid-controlled oil supplement valve 3, bidirectional hydraulic locking-valve 4,5 safety valve 6 of elevating ram, three
Phase bridge-type inverter, energy supply-energy storage device, control device, fuel tank 7；Double acting motor 2 is connected with double acting motor 1；Double acting
The oil discharge outlet and inlet port of motor 1 are connected with bidirectional hydraulic locking-valve 4；The rod chamber with elevating ram 5 respectively of bidirectional hydraulic locking-valve 4
It is connected with rodless cavity；Control device includes that control chip and auxiliary circuit, double acting motor are connected with three-phase bridge type converter, and three
Phase bridge-type inverter is connected with energy supply energy storage device, and control device is respectively connected to three-phase bridge type converter and energy supply energy storage dress
Set and control the working condition of the two.
1 output shaft of double acting motor installs built-in bearing speed encoder, completes to motor rotor position and rotary speed information
Detection, detection signal is transmitted to the I/O mouth of control device ATMEGA328P-PU chip.
Seal-off pressure oil tank 8 is connected with liquid-controlled oil supplement valve 3, liquid-controlled oil supplement valve 3 be connected in parallel on double acting motor 2 oil outlet and
Inlet port, the hydraulic oil of seal-off pressure oil tank 8 can going out to double acting motor respectively by two check valves of liquid-controlled oil supplement valve 3
Hydraulic fluid port and inlet port fuel feeding.
Safety valve 6 is made of two overflow valves, and two overflow valves are connected with 5 rod chamber of elevating ram and rodless cavity respectively.
Since fork of forklift truck lifting weight weight has larger uncertainty, so when pallet fork is declined suddenly by greater impact, lifting
The occurrence of 5 hydraulic oil of oil cylinder has little time to flow, and easily occurs suppressing cylinder phenomenon, such in order to prevent, when pressure in elevating ram
When reaching relief valve set pressure, overflow valve is opened, and discharges the pressure in elevating ram 5, protects elevating ram 5.Energy supply-energy storage
Device is made of battery A1 and super capacitor A2 referring to attached drawing 2, further include respectively with battery A1 and super capacitor A2 phase
The first relay A5, the second relay A6 even and first voltage sensors A 3, second voltage sensors A 4.Battery A1
It is connected in parallel on the output end of three-phase bridge type converter with super capacitor A2, provides energy source for forklift lifting system, and for storing
The potential energy of pallet fork decline recycling.When pallet fork declines, second voltage sensors A 4 is with the detection frequency detecting super capacitor A2 of 1KHZ
Both end voltage, when super capacitor A2 both end voltage is lower than voltage rating 27V, control device controls the second relay A6 conducting,
Pallet fork decline potential energy is preferably super capacitor A2 power supply；When pallet fork declines or when super capacitor A2 is recycling potential energy charging, when
When super capacitor A2 both end voltage is not less than voltage rating, control device controls the second relay A6 shutdown, the first relay A5
Conducting, pallet fork decline potential energy as battery A1 charging；At the end of pallet fork descending stroke, the first relay A5 of control device control,
Second relay A6 shutdown.When pallet fork lifting, second voltage sensors A 4 detects super capacitor A1 both end voltage, when super electricity
When holding A1 both end voltage not less than voltage rating, control device controls the second relay A6 conducting, and super capacitor A2 is fork truck act
Rising moment provides electric energy, power-on time 1 to 2 second or until when super capacitor A2 undertension 20V, control device control later the
Two relay A6 shutdown, the first relay A5 conducting, are forklift lifting system power supply by battery A1.
Voltage sensor utilizes electric resistance partial pressure principle, port input voltage is reduced five times, detected value is transmitted to
ATMEGA328P-PU chip I/O mouthfuls, completes the acquisition of voltage signal.
Three-phase bridge type converter mainly completes the AC-DC conversion of electric current between energy supply-energy storage device and double acting motor 1,
Energy supply-energy storage device operating current is direct current, and 1 operating current of double acting motor is three-phase alternating current.Three-phase bridge type converter
Structure it is as shown in Fig. 3, be mainly made of the diode of six or six times of several metal-oxide-semiconductors, six free switch.Same perpendicular column
Metal-oxide-semiconductor be a phase, to avoid DC power supply short-circuit, only one conducting of every phase MOS synchronization.When energy supply-energy storage device
When powering for double acting motor 1, control device issues the conducting and shutdown that pwm signal controls six metal-oxide-semiconductors, using between three-phase
The conducting of different metal-oxide-semiconductors is delayed, and DC voltage can be converted to sequence of voltage pulses, to drive double acting motor 1；Because each
When driving the multiple metal-oxide-semiconductor parallel connections of bridge arm, driving current can be increased, therefore according to the rated current situation of double acting motor 1, really
The number of metal-oxide-semiconductor needed for fixed.When double acting motor 1 is energy supply energy storage device charging, metal-oxide-semiconductor stops working, each drive axle
The diode of upper free switch is converted into six traditional pulse rectifiers, converts direct current for three-phase alternating current, is battery
Charging.First current sensor B1 and the second current sensor B2 detects the electric current of three-phase electricity U, V phase, detection signal transmission respectively
ATMEGA328P-PU chip is given, using three-phase current and is zero, W phase current can be found out, may determine that currently by detecting electric current
The torque conditions of double acting motor 1.
Current sensor is electromagnetic isolation Hall element, and when having electric current to flow through in electric wire, induction is generated in Hall element
Magnetic field, the current signal detected are transferred directly to the I/O mouth of control device ATMEGA328P-PU chip, complete current signal
Acquisition.
Control device is mainly made of ATMEGA328P-PU chip and auxiliary circuit, as shown in Fig. 4.ATMEGA328P-
PU integrated chip is in arduino plate, including digital I/O interface and simulation I/O interface, achievable to believe current signal, voltage
Number data acquisition, output pwm signal controls the on-off of relay, and the electric operation control circuit figure of control device is as shown in Figure 3.
ATMEGA328P-PU chip receives pallet fork raising signal, dropping signal, and acquires the voltage sensor in energy supply-energy storage device
Signal controls the break-make situation of relay in energy supply-energy storage device；Control device controls double cropping by Study on direct torque control technology
With 1 revolving speed of motor, ATMEGA328P-PU chip receives the speed preset (command speed) in program, passes through Hall current
Sensor and speed encoder judge the working condition of current three-phase bridge type converter, generate torque command (torque current) control
The working condition of three-phase bridge type converter, and then control 1 revolving speed of double acting motor.
Embodiment 1, the first working condition.
When pallet fork raising, control device is connected to pallet fork raising signal, and second voltage sensors A 5 detects super electricity at this time
Hold A2 both end voltage, if super capacitor A2 both end voltage is not less than voltage rating, control device controls the second relay A6 and leads
Logical, super capacitor A2 provides electric energy for forklift lifting moment, and power-on time is 1 to 2 second or until super capacitor A2 undertension
When 20V, it is forklift lifting by battery A1 that control device, which controls the second relay A6 shutdown, the first relay A5 conducting, later
System power supply.The direct current of super capacitor A2 or battery A1, control device are controlled three-phase bridge by three-phase bridge type converter at this time
Formula inverter metal-oxide-semiconductor B3, B13, B7, B5, B11, B9 are successively opened, and control metal-oxide-semiconductor switching sequence difference 120 between three-phase
Degree, makes the similar output sine wave of U, V, W tri-, and converting direct-current power into alternating-current power is powered, at this time double cropping for double acting motor 1
It is worked with motor 1 in motor status.Double acting motor 1 drives double acting motor 2 to rotate, and the work of double acting motor 2 at this time is pumping
State.The electric current and tach signal of control device real-time reception double acting motor 1, and with control program in given rotating speed pair
Than controlling pwm signal, and then change the switching sequence of metal-oxide-semiconductor, making U, V, W three-phase output voltage amplitude and double acting motor 1
Power angle to control three-phase alternating voltage control generator speed, and then controls revolution speed.Pump drives hydraulic oil by two-way
Hydraulic locking-valve 4 flows to 5 rodless cavity of elevating ram, when pallet fork, which needs to rest on some position, completes tripping action, pumps by working
State becomes off working state, and bidirectional hydraulic locking-valve 4 cuts off rapidly oil circuit, prevents 5 rodless cavity oil return of elevating ram, and then lock
Pallet fork position.When electri forklift hoisting system is encountered compared with heavy duty, cause 5 rod chamber of elevating ram and rodless cavity differing pressure compared with
When there is hydraulic oil impact greatly or suddenly, safety valve 6 is opened at this time, automatic adjustment 5 rod chamber of elevating ram and rodless cavity pressure
Difference prevents elevating ram 5 from occurring suppressing cylinder phenomenon.In the course of work of pump, if pump oil suction is insufficient, lead to raising oil circuit hydraulic oil
When insufficient, liquid-controlled oil supplement valve 3 gives pump repairing automatically, guarantees the normal work of hydraulic system.
Embodiment 2, the first working condition.
When pallet fork decline, 5 rodless cavity oil return of elevating ram, bidirectional hydraulic locking-valve 4 is opened, and hydraulic oil passes through bidirectional hydraulic
Locking-valve 4 flows into double acting pump-motor 2, and double acting motor 2 is driven to invert.At this point, the work of double acting motor 2 is in pump state.Pump
Double acting motor 1 is driven to invert, at this point, the work of double acting motor 1, in Generator Status, electrical power generators are inverse by three-phase bridge
Become device to charge to super capacitor A2 or battery A1.Current sensor and speed when pallet fork decrease speed is too fast, on generator
Generator working speed, torque conditions are transmitted to control device by encoder, control device by generator actual speed signal with give
Determine rotating ratio pair, calculate the angle of stator magnetic linkage space vector, selection nearby by metal-oxide-semiconductor B3, B9, B11 or B5, B7, B13 or
B5, B7, B11 or B5, B9, B11 conducting, make 1 stator magnetic linkage of double acting motor become larger, increase generator torque, increase motor and turn
Square increases hydraulic system and declines resistance, and hydraulic oil slows down inflow lifting oil by the hydraulic control one-way valve on 4 the right of bidirectional hydraulic locking-valve
5 rod chamber of cylinder, while the hydraulic control one-way valve reverse opening on 4 left side of hydraulic control bidirectional hydraulic locking-valve, 5 rodless cavity liquid of elevating ram
Pressure oil is slowed down by the hydraulic control one-way valve on 4 left side of bidirectional hydraulic locking-valve flows back to double-acting pump-motor, and then slows down reduction of speed under pallet fork
Degree.When pallet fork decrease speed is excessively slow, nearby selection by metal-oxide-semiconductor B3, B9, B13 or B3, B9, B11 or B3, B7, B11 or B5, B9,
B13 conducting, makes 1 stator magnetic linkage of double acting motor become smaller, and reduces generator torque, reduces motor torque, reduces under hydraulic system
Resistance drops, and hydraulic oil is accelerated to flow into 5 rod chamber of elevating ram, while liquid by the hydraulic control one-way valve on 4 the right of bidirectional hydraulic locking-valve
The hydraulic control one-way valve reverse opening on voltage-controlled 4 left side of bidirectional hydraulic locking-valve processed, 5 rodless cavity hydraulic oil of elevating ram pass through bidirectional hydraulic
Double acting motor 2 is flowed back in the hydraulic control one-way valve quickening on 4 left side of locking-valve, and then accelerates pallet fork decrease speed.When generator is super
When capacitor A2 or battery A1 charges, second voltage sensors A 4 detects super capacitor A2 both end voltage, as super capacitor A2 two
When voltage being held to be lower than voltage rating 27V, control device controls the second relay A6 conducting, and it is preferably super electricity that pallet fork, which declines potential energy,
Hold A2 charging；When pallet fork declines or when super capacitor A2 is recycling potential energy charging, when super capacitor A2 both end voltage is not less than
When voltage rating, control device controls the second relay A6 shutdown, the first relay A1 conducting, and it is battery that pallet fork, which declines potential energy,
A1 charging；At the end of pallet fork descending stroke, control device controls the first relay A5, the second relay A6 shutdown.
Claims (10)
1. a kind of fork truck energy saving system with speed-regulating function, characterized in that including double acting motor, double acting motor,
Bidirectional hydraulic locking-valve, elevating ram, three-phase bridge type converter, energy supply energy storage device and control device；Double acting motor and double cropping
It is connected with motor, the oil discharge outlet and inlet port of double acting motor are connected with bidirectional hydraulic locking-valve；Bidirectional hydraulic locking-valve respectively with act
The rod chamber of oil-lifting jar is connected with rodless cavity；Control device includes control chip and auxiliary circuit, double acting motor and three-phase bridge
Formula inverter is connected, and three-phase bridge type converter is connected with energy supply energy storage device, and control device is respectively connected to three-phase bridge type inverse
Device and energy supply energy storage device and the working condition for controlling the two.
2. a kind of fork truck energy saving system with speed-regulating function according to claim 1, characterized in that control device
Receive the acquisition signal of current sensor, voltage sensor and speed encoder, output pwm signal controls three-phase bridge type inverse
The turn-on and turn-off condition of metal-oxide-semiconductor in device, control energize the turn-on and turn-off condition of relay in energy storage device, current sensor
U, V phase being mounted in the three-phase wire of three-phase inverter, voltage sensor are mounted on the output end of super capacitor and battery,
Speed encoder is mounted on double acting motor output shaft.
3. a kind of fork truck energy saving system with speed-regulating function according to claim 1, characterized in that control chip
It is ATMEGA328P-PU chip.
4. a kind of fork truck energy saving system with speed-regulating function according to claim 1, characterized in that the system is also
Including liquid-controlled oil supplement valve and seal-off pressure oil tank, seal-off pressure oil tank is connected with liquid-controlled oil supplement valve, and liquid-controlled oil supplement valve is connected in parallel on double
The hydraulic oil of the oil outlet and inlet port of acting motors, seal-off pressure oil tank can be distinguished by two check valves of liquid-controlled oil supplement valve
To the oil outlet and inlet port fuel feeding of double acting motor.
5. a kind of fork truck energy saving system with speed-regulating function according to claim 1, characterized in that the system packet
Safety valve is included, safety valve is made of two overflow valves, and two overflow valves are connected with elevating ram rod chamber and rodless cavity respectively.
6. a kind of fork truck energy saving system with speed-regulating function according to claim 1, characterized in that double cropping electricity consumption
Machine includes motor and generator, exports electric energy when double acting motor rotates forward, produces electricl energy when motor reversal.
7. a kind of fork truck energy saving system with speed-regulating function according to claim 1, characterized in that double acting horse
Up to including motor and pump, attraction is generated when double acting motor rotates forward, generates thrust when the reversion of double acting motor.
8. a kind of fork truck energy saving system with speed-regulating function according to claim 1, characterized in that hydraulic oil stream
When entering bidirectional hydraulic locking-valve left side hydraulic control one-way valve, hydraulic control one-way valve is reversely opened on the right of oil pressure cntrol bidirectional hydraulic locking-valve, into
The hydraulic oil for entering elevating ram rodless cavity pushes elevating ram rod chamber hydraulic oil to pass through hydraulic control one-way valve on the right of two-way locking-valve, stream
Return double acting motor；When hydraulic oil flows into hydraulic control one-way valve on the right of bidirectional hydraulic locking-valve, the oil pressure cntrol bidirectional hydraulic locking-valve left side
Hydraulic control one-way valve is reversely opened, and the hydraulic oil into elevating ram rod chamber pushes elevating ram rodless cavity hydraulic oil by two-way
Locking-valve left side hydraulic control one-way valve, flows back to double acting motor.
9. a kind of fork truck energy saving system with speed-regulating function according to claim 2, characterized in that pallet fork decline
When excessive velocities, the working speed of generator and torque conditions are transmitted to control by current sensor and speed encoder on generator
Device processed, control device compare generator actual speed signal with given rotating speed, adjust metal-oxide-semiconductor switching sequence, reduce double cropping
With motor-generator speed, increase the torque of double acting electric motor-generator, increase double-acting pump-motor torque, increases hydraulic pressure system
System decline resistance, hydraulic oil is slowed down by the hydraulic control one-way valve on the right of bidirectional hydraulic locking-valve flows into elevating ram rod chamber, simultaneously
The hydraulic control one-way valve reverse opening on the hydraulic control bidirectional hydraulic locking-valve left side, elevating ram rodless cavity hydraulic oil pass through bidirectional hydraulic
The hydraulic control one-way valve on the locking-valve left side, which slows down, flows back to double-acting pump-motor, and then slows down pallet fork decrease speed.
10. a kind of fork truck energy saving system with speed-regulating function according to claim 2, it is characterized in that pallet fork declines
When speed is excessively slow, generator working speed, torque conditions are transmitted to control by current sensor and speed encoder on generator
Device, control device compare generator actual speed signal with given rotating speed, adjust metal-oxide-semiconductor switching sequence, increase double acting
Electric motor-generator revolving speed reduces the torque of double acting electric motor-generator, reduces double-acting pump-motor torque, reduces hydraulic system
Decline resistance, hydraulic oil is accelerated to flow into elevating ram rod chamber, while liquid by the hydraulic control one-way valve on the right of bidirectional hydraulic locking-valve
The hydraulic control one-way valve reverse opening on the voltage-controlled bidirectional hydraulic locking-valve processed left side, elevating ram rodless cavity hydraulic oil pass through bidirectional hydraulic lock
Double-acting pump-motor is flowed back in the hydraulic control one-way valve quickening on the valve left side, and then accelerates pallet fork decrease speed.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108298474A (en) * | 2017-12-26 | 2018-07-20 | 浙江大学 | A kind of fork truck energy saving system with speed-regulating function |
| CN110374941A (en) * | 2019-01-09 | 2019-10-25 | 浙江大学 | A kind of the fork truck potential energy recovery system and control method adaptive according to load weight |
| US20220258554A1 (en) * | 2021-02-17 | 2022-08-18 | Francis Walls | Kinetic Energy Shock Absorber |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108298474A (en) * | 2017-12-26 | 2018-07-20 | 浙江大学 | A kind of fork truck energy saving system with speed-regulating function |
| CN108298474B (en) * | 2017-12-26 | 2024-09-03 | 浙江大学 | Fork truck high-efficient economizer system with speed governing function |
| CN110374941A (en) * | 2019-01-09 | 2019-10-25 | 浙江大学 | A kind of the fork truck potential energy recovery system and control method adaptive according to load weight |
| CN110374941B (en) * | 2019-01-09 | 2020-12-22 | 浙江大学 | Forklift potential energy recovery system self-adaptive to load weight and control method |
| US20220258554A1 (en) * | 2021-02-17 | 2022-08-18 | Francis Walls | Kinetic Energy Shock Absorber |
| US12011960B2 (en) * | 2021-02-17 | 2024-06-18 | Francis Walls | Kinetic energy shock absorber |
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