CN107235440B - A kind of liquid electricity mixing energy conserving system for lifting mechanism - Google Patents
A kind of liquid electricity mixing energy conserving system for lifting mechanism Download PDFInfo
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- CN107235440B CN107235440B CN201710428151.0A CN201710428151A CN107235440B CN 107235440 B CN107235440 B CN 107235440B CN 201710428151 A CN201710428151 A CN 201710428151A CN 107235440 B CN107235440 B CN 107235440B
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- cylinder
- electric cylinder
- lifting mechanism
- electric
- boom
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
- B66F3/46—Combinations of several jacks with means for interrelating lifting or lowering movements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
- B66F3/44—Devices, e.g. jacks, adapted for uninterrupted lifting of loads with self-contained electric driving motors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/14—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Power Engineering (AREA)
- Fluid-Pressure Circuits (AREA)
- Operation Control Of Excavators (AREA)
Abstract
The invention discloses a kind of liquid electricity mixing energy conserving systems for lifting mechanism, the system is by increasing electric cylinder, motor speed controller, two-way DC/DC converter, super capacitor group and pressure sensor, in conjunction with corresponding control method, when realizing swing arm decline, its gravitional force is converted into electric energy as super capacitor group charging；When boom arm lift, super capacitor group provides electric energy for the driving motor of electric cylinder with auxiliary drive.A kind of liquid electricity mixing energy conserving system for lifting mechanism disclosed by the invention has many advantages, such as that the storage utilization efficiency of movable arm potential energy is high, output is steady, and installed power is small.
Description
Technical field
The invention belongs to lifting mechanism energy regenerating fields, and in particular to a kind of liquid electricity mixing energy conservation for lifting mechanism
System.
Background technique
Currently, widely used excavator, the Work machines such as loading machine because working environment is severe, job state is complicated,
Load change is violent, so that engine working range variation is greatly, causes complete machine energy utilization rate lower, emission performance is poor.Simultaneously
The lifting mechanism of these equipments mainly uses hydraulic system to drive, and needs swing arm frequently to go up and down during the work time, due to swing arm
It to be self-possessed larger, hydraulic system needs to overcome gravity acting when driving its rising, and section hydraulic can be converted to the potential energy of operating mechanism,
But in its decline, the potential energy of swing arm is generally converted to hydraulic energy, is converted into heat using control valve and dissipates, this makes liquid
System temperature is pressed to increase, reliability decrease, while causing a large amount of energy waste.
In order to solve the above technical problems, recycling energy frequently with liquid gas energy storage mode or electrical energy storage mode.Specially
Sharp (202391827 U of CN) and patent (103993625 A of CN) have used liquid gas energy storage mode to recycle the decline gesture of swing arm
Energy.However need to consider the problems of that leakage problem, required mechanical volume, the dynamic response of gas are slow using liquid gas energy storage mode
The problem of problem and energy storage pressure fluctuation larger impact controllability.Patent (101435451 A of CN) is in the way of electrical energy storage
It recovers energy, in swing arm decentralization, oil liquid is stored into accumulator first, it is hydraulic being driven using the oil liquid in accumulator
Motor, hydraulic motor drive dynamoelectric machine again, and swing arm gravitional force is finally converted to electric energy, storage to super capacitor or
In battery.This energy regenerating mode energy passes through multiple conversions, and efficiency is lower, is not suitable for small-sized machine.
Summary of the invention
The present invention is directed to the deficiency of existing Energy Recovery Technology, provides a kind of liquid electricity mixing energy conservation system for lifting mechanism
System, to realize the high efficiente callback and recycling of movable arm potential energy.
A kind of liquid electricity mixing energy conserving system for lifting mechanism, including power source (1), hydraulic pump (2), fuel tank (3), overflow
Flow that valve (4), hydraulic circuit (5), at least one boom cylinder (11), swing arm (7), control unit (13), at least one is electronic
Cylinder (8), motor speed controller (12), two-way DC/DC converter (10), super capacitor group (9) and pressure sensor (6)；It is dynamic
Power source output shaft is connect with hydraulic pump, and the oil outlet of hydraulic pump and the oil inlet P of hydraulic circuit and overflow valve oil inlet connect, and is overflow
The oil outlet of stream valve is connect with fuel tank；The oil return inlet T of hydraulic circuit is connect with fuel tank；The rodless cavity and rod chamber of boom cylinder
Pass through actuator port A and the actuator port B connection of pipeline and hydraulic circuit respectively, pressure sensor is mounted on and boom cylinder
On the pipeline of rodless cavity connection, for detecting the pressure P of boom cylinder rodless cavityA；The driving motor and motor of electric cylinder turn
Fast controller is connected；The direct current that the input terminal and output end of two-way DC/DC converter are connect with motor speed controller respectively is female
Line is connected with super capacitor group；Pressure sensor, electrically-controlled valve, motor speed controller and two-way DC/DC converter and control
Unit connection and interactive signal；
It is arranged on the center line of lifting mechanism before and after boom cylinder and electric cylinder, cylinder body end passes through the second liquid respectively
Cylinder pressure pin shaft and the second electric cylinder pin shaft are hinged in upper frame, and tailpiece of the piston rod passes through first hydraulic cylinder pin shaft and first respectively
Electric cylinder pin shaft is hinged on swing arm.
When lifting mechanism is started to work, control unit is according to the comparison of pressure sensor output signal u and its preset value
As a result the working condition of motor speed controller and two-way DC/DC converter is controlled: when swing arm declines, the output of pressure sensor
Signal u is lower than its preset value, and the driving motor of electric cylinder is in generating state at this time, and control unit controls motor speed controller
It works with two-way DC/DC converter, the electric energy for issuing the driving motor of electric cylinder passes through the two-way super electricity of DC/DC converter
The charging of appearance group, is partially recovered in this way, the gravitional force of swing arm is converted into electric energy；When boom arm lift, pressure sensor
Output signal u be higher than its preset value, the driving motor of electric cylinder should be at motoring condition at this time, and control unit controls motor and turns
Fast controller and two-way DC/DC converter work, so that super capacitor group provides electric energy, electric cylinder for the driving motor of electric cylinder
Swing arm is driven to rise together with boom cylinder.
When in system including two boom cylinders or two electric cylinders, single boom cylinder or electric cylinder arrangement
On the center line of lifting mechanism, boom cylinder and electric cylinder are arranged in parallel, and cylinder body end is same by second hydraulic cylinder pin shaft
Axis is hinged in upper frame, and tailpiece of the piston rod passes through first hydraulic cylinder pin shaft respectively and the first electric cylinder pin shaft is hinged to swing arm
On.
The driving motor of the electric cylinder is powered by power grid or battery group.
The driving motor of the electric cylinder is AC induction motor, switched reluctance motor, direct current generator or servo motor
One of.
Compared with prior art, a kind of liquid electricity mixing energy conserving system for lifting mechanism provided by the invention, have with
Lower advantage:
1. the present invention directly converts the method that storage utilizes using swing arm gravitional force-electric energy: when swing arm declines, electric cylinder
Driving motor be in generating state, the electric energy of sending is that super capacitor group charges by two-way DC/DC converter, swing arm gravity
Potential energy is converted into electric energy.When boom arm lift, the driving motor of electric cylinder should be at motoring condition, and super capacitor group is electricity
The driving motor of dynamic cylinder provides electric energy, and electric energy is converted into swing arm gravitional force.Therefore, the invention avoids the prior arts to deposit
In restriction loss, the loss of energy multiple conversions, the storage utilization efficiency of movable arm potential energy can be obviously improved.
2. the present invention can make under hydraulic system drive condition, the appearance of complex state and lead to power source working environment wave
Dynamic problem is eased, and keeps the output of power source steady, reduces installed power.
3. the present invention is suitable for a variety of lifting mechanisms, particularly suitable for hybrid power or complete electrically driven (operated) engineering machinery
Swing arm lifting mechanism, and it is mechanical to can operate with fixed lifting.
Detailed description of the invention
Fig. 1 is present system composition schematic diagram；
Fig. 2 is 1 system composition schematic diagram of the embodiment of the present invention；
Fig. 3 is 2 system composition schematic diagram of the embodiment of the present invention.
In figure: 1: power source；2: hydraulic pump；3: fuel tank；4: overflow valve；5: hydraulic circuit；6: pressure sensor；7: dynamic
Arm；8: electric cylinder；9: super capacitor group；10: two-way DC/DC converter；11: boom cylinder；12: motor speed controller；
13: control unit；14: first hydraulic cylinder pin shaft；15: swing arm pin shaft；16: upper frame；17: second hydraulic cylinder pin shaft；18: the first
Electric cylinder pin shaft；19: the second electric cylinder pin shafts.
Specific embodiment
Detailed technology scheme of the invention is introduced below in conjunction with attached drawing:
As shown in Figure 1, a kind of liquid electricity mixing energy conserving system for lifting mechanism, including power source 1, hydraulic pump 2, fuel tank
3, overflow valve 4, hydraulic circuit 5, at least one boom cylinder 11, swing arm 7, control unit 13, at least one electric cylinder 8, electricity
Machine rotational speed governor 12, two-way DC/DC converter 10, super capacitor group 9,6 power source output shaft of pressure sensor and hydraulic pump
Connection, the oil outlet of hydraulic pump and the oil inlet P of hydraulic circuit and overflow valve oil inlet connect, the oil outlet and fuel tank of overflow valve
Connection；The oil return inlet T of hydraulic circuit is connect with fuel tank；The rodless cavity and rod chamber of boom cylinder pass through respectively pipeline with it is hydraulic
The actuator port A in circuit is connected with actuator port B, and pressure sensor is mounted on the pipeline connecting with boom cylinder rodless cavity
On, for detecting the pressure P of boom cylinder rodless cavityA；The driving motor of electric cylinder is connected with motor speed controller；It is two-way
The DC bus and super capacitor group that the input terminal and output end of DC/DC converter are connect with motor speed controller respectively connect
It connects；Pressure sensor, electrically-controlled valve, motor speed controller and two-way DC/DC converter connect with control unit and interact letter
Number.
It is arranged on the center line of lifting mechanism before and after boom cylinder and electric cylinder, cylinder body end passes through the second liquid respectively
Cylinder pressure pin shaft and the second electric cylinder pin shaft are hinged in upper frame, and tailpiece of the piston rod passes through first hydraulic cylinder pin shaft and first respectively
Electric cylinder pin shaft is hinged on swing arm.
When in system including two boom cylinders or two electric cylinders, single boom cylinder or electric cylinder arrangement
On the center line of lifting mechanism, boom cylinder and electric cylinder are arranged in parallel, and cylinder body end is same by second hydraulic cylinder pin shaft
Axis is hinged in upper frame, and tailpiece of the piston rod passes through first hydraulic cylinder pin shaft respectively and the first electric cylinder pin shaft is hinged to swing arm
On.
When lifting mechanism is started to work, control unit is according to the comparison of pressure sensor output signal u and its preset value
As a result the working condition of motor speed controller and two-way DC/DC converter is controlled: when swing arm declines, the output of pressure sensor
Signal u is lower than its preset value, and the driving motor of electric cylinder is in generating state at this time, and control unit controls motor speed controller
It works with two-way DC/DC converter, the electric energy for issuing the driving motor of electric cylinder passes through the two-way super electricity of DC/DC converter
The charging of appearance group, is partially recovered in this way, the gravitional force of swing arm is converted into electric energy；When boom arm lift, pressure sensor
Output signal u be higher than its preset value, the driving motor of electric cylinder should be at motoring condition at this time, and control unit controls motor and turns
Fast controller and two-way DC/DC converter work, so that super capacitor group provides electric energy, electric cylinder for the driving motor of electric cylinder
Swing arm is driven to rise together with boom cylinder.
The driving motor of the electric cylinder is powered by power grid or battery group.
The driving motor of the electric cylinder is AC induction motor, switched reluctance motor, direct current generator or servo motor
One of.
Embodiment 1
As shown in Fig. 2, a kind of liquid electricity mixing energy conserving system for lifting mechanism, including power source 1, hydraulic pump 2, fuel tank
3, overflow valve 4,5, two boom cylinders 11 of hydraulic circuit, swing arm 7, control unit 13, electric cylinders 8, a motor speed controls
Device 12 processed, two-way DC/DC converter 10, super capacitor group 9,6 power source output shaft of pressure sensor are connect with hydraulic pump, hydraulic
The oil outlet of pump and the oil inlet P of hydraulic circuit and the connection of overflow valve oil inlet, the oil outlet of overflow valve are connect with fuel tank；It is hydraulic
The oil return inlet T in circuit is connect with fuel tank；The rodless cavity and rod chamber of boom cylinder pass through the work of pipeline and hydraulic circuit respectively
Make hydraulic fluid port A to connect with actuator port B, pressure sensor is mounted on the pipeline connecting with boom cylinder rodless cavity, for examining
Survey the pressure P of boom cylinder rodless cavityA；The driving motor of electric cylinder is connected with motor speed controller；Two-way DC/DC transformation
DC bus and the super capacitor group connection that the input terminal and output end of device are connect with motor speed controller respectively；Pressure sensing
Device, electrically-controlled valve, motor speed controller and two-way DC/DC converter are connect with control unit and interactive signal.
Electric cylinder is arranged on the center line of lifting mechanism, and two boom cylinders and electric cylinder are arranged in parallel, and two dynamic
Arm hydraulic cylinder symmetrical expression is distributed in the two sides of electric cylinder, and cylinder body end is coaxially hinged to upper frame by second hydraulic cylinder pin shaft
On, tailpiece of the piston rod passes through first hydraulic cylinder pin shaft respectively and the first electric cylinder pin shaft is hinged on swing arm.Swing arm passes through swing arm
Pin shaft is hinged in upper frame.
Embodiment 2
As shown in figure 3, a kind of liquid electricity mixing energy conserving system for lifting mechanism, including power source 1, hydraulic pump 2, fuel tank
3, overflow valve 4,5, boom cylinders 11 of hydraulic circuit, swing arm 7, the motor of electric cylinder 8, two of control unit 13, two turn
Fast controller 12, two-way DC/DC converter 10, super capacitor group 9,6 power source output shaft of pressure sensor are connect with hydraulic pump,
The oil outlet of hydraulic pump and the oil inlet P of hydraulic circuit and the connection of overflow valve oil inlet, the oil outlet of overflow valve are connect with fuel tank；
The oil return inlet T of hydraulic circuit is connect with fuel tank；The rodless cavity and rod chamber of boom cylinder pass through pipeline and hydraulic circuit respectively
Actuator port A connected with actuator port B, pressure sensor is mounted on the pipeline connecting with boom cylinder rodless cavity, use
In the pressure P of detection boom cylinder rodless cavityA；The driving motor of electric cylinder is connected with motor speed controller；Two-way DC/DC
DC bus and the super capacitor group connection that the input terminal and output end of converter are connect with motor speed controller respectively；Pressure
Sensor, electrically-controlled valve, motor speed controller and two-way DC/DC converter are connect with control unit and interactive signal.
Boom cylinder is arranged on the center line of lifting mechanism, and boom cylinder and two electric cylinders are arranged in parallel, and two
A electric cylinder symmetrical expression is distributed in the two sides of boom cylinder, and cylinder body end is coaxially hinged to by second hydraulic cylinder pin shaft and is got on the bus
On frame, tailpiece of the piston rod passes through first hydraulic cylinder pin shaft respectively and the first electric cylinder pin shaft is hinged on swing arm.Swing arm passes through dynamic
Arm pin shaft is hinged in upper frame.
Embodiment 1 and embodiment 2 are all made of following control method:
When lifting mechanism is started to work, control unit is according to the comparison of pressure sensor output signal u and its preset value
As a result the working condition of motor speed controller and two-way DC/DC converter is controlled: when swing arm declines, the output of pressure sensor
Signal u is lower than its preset value, and the driving motor of electric cylinder is in generating state at this time, and control unit controls motor speed controller
It works with two-way DC/DC converter, the electric energy for issuing the driving motor of electric cylinder passes through the two-way super electricity of DC/DC converter
The charging of appearance group, is partially recovered in this way, the gravitional force of swing arm is converted into electric energy；When boom arm lift, pressure sensor
Output signal u be higher than its preset value, the driving motor of electric cylinder should be at motoring condition at this time, and control unit controls motor and turns
Fast controller and two-way DC/DC converter work, so that super capacitor group provides electric energy, electric cylinder for the driving motor of electric cylinder
Swing arm is driven to rise together with boom cylinder.
The above only designates several embodiments of the invention, and the description thereof is more specific and detailed, but is not pair
The limitation of protection scope of the present invention.The present invention is not limited to excavators, are readily applicable to loading machine, other works such as crane
In journey machinery.
The present invention drives swing arm using electric cylinder and hydraulic cylinder jointly, and the arrangement of electric cylinder and hydraulic cylinder can be by different situations
Flexibly variation: when the present invention is used for light-duty machinery, electric cylinder mainly drives swing arm to work, and hydraulic cylinder can reduce number；For weight
When type machinery, electric cylinder auxiliary hydraulic cylinder drives swing arm work, potential energy when electric cylinder is for recycling swing arm decentralization.
Claims (4)
1. a kind of liquid electricity mixing energy conserving system for lifting mechanism, including power source (1), hydraulic pump (2), fuel tank (3), overflow
Valve (4), hydraulic circuit (5), at least one boom cylinder (11), swing arm (7), control unit (13), it is characterised in that: also wrap
Include at least one electric cylinder (8), motor speed controller (12), two-way DC/DC converter (10), super capacitor group (9) and pressure
Force snesor (6)；Power source output shaft is connect with hydraulic pump, the oil outlet of hydraulic pump and the oil inlet P of hydraulic circuit and overflow
The connection of valve oil inlet, the oil outlet of overflow valve are connect with fuel tank；The oil return inlet T of hydraulic circuit is connect with fuel tank；Boom cylinder
Rodless cavity and rod chamber pass through actuator port A and the actuator port B connection of pipeline and hydraulic circuit, pressure sensor peace respectively
On the pipeline being connect with boom cylinder rodless cavity, for detecting the pressure P of boom cylinder rodless cavityA；Electric cylinder
Driving motor is connected with motor speed controller；The input terminal and output end of two-way DC/DC converter respectively with motor speed control
The DC bus of device connection processed is connected with super capacitor group；Pressure sensor, electrically-controlled valve, motor speed controller and two-way
DC/DC converter is connect with control unit and interactive signal；
It is arranged on the center line of lifting mechanism before and after boom cylinder and electric cylinder, cylinder body end passes through second hydraulic cylinder respectively
Pin shaft and the second electric cylinder pin shaft are hinged in upper frame, and tailpiece of the piston rod passes through first hydraulic cylinder pin shaft and first electronic respectively
Cylinder pin shaft is hinged on swing arm；
When lifting mechanism is started to work, control unit is according to the comparison result of pressure sensor output signal u and its preset value
Control the working condition of motor speed controller and two-way DC/DC converter: when swing arm declines, the output signal of pressure sensor
U is lower than its preset value, and the driving motor of electric cylinder be in generating state at this time, control unit control motor speed controller with pair
It works to DC/DC converter, the electric energy for issuing the driving motor of electric cylinder passes through two-way DC/DC converter super capacitor group
Charging, is partially recovered in this way, the gravitional force of swing arm is converted into electric energy；When boom arm lift, pressure sensor it is defeated
Signal u is higher than its preset value out, and the driving motor of electric cylinder should be at motoring condition at this time, and control unit controls motor speed control
Device processed and two-way DC/DC converter work so that super capacitor group is that the driving motor of electric cylinder provides electric energy, electric cylinder with move
Arm hydraulic cylinder drives swing arm to rise together.
2. a kind of liquid electricity mixing energy conserving system for lifting mechanism according to claim 1, it is characterised in that: work as system
In when including a boom cylinder and an electric cylinder, be arranged in parallel before and after boom cylinder and electric cylinder in lifting mechanism
On center line；When in system including two boom cylinders and an electric cylinder, electric cylinder is arranged in lifting mechanism center line
On, two boom cylinders are arranged symmetrically in electric cylinder two sides, boom cylinder and electric cylinder or so parallel arrangement.
3. a kind of liquid electricity mixing energy conserving system for lifting mechanism according to claim 1, it is characterised in that: the electricity
The driving motor of dynamic cylinder is powered by power grid or battery group.
4. a kind of liquid electricity mixing energy conserving system for lifting mechanism according to claim 1, it is characterised in that: the electricity
The driving motor of dynamic cylinder is one of AC induction motor, switched reluctance motor, direct current generator or servo motor.
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| CN201710428151.0A CN107235440B (en) | 2017-06-08 | 2017-06-08 | A kind of liquid electricity mixing energy conserving system for lifting mechanism |
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| CN201710428151.0A CN107235440B (en) | 2017-06-08 | 2017-06-08 | A kind of liquid electricity mixing energy conserving system for lifting mechanism |
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| CN107235440B true CN107235440B (en) | 2019-02-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112049177A (en) * | 2020-09-07 | 2020-12-08 | 江苏师范大学 | Energy-saving device for electric recovery and reutilization of potential energy of movable arm of excavator |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108223499A (en) * | 2018-01-08 | 2018-06-29 | 华侨大学 | A kind of motor-direct-drive type swing arm energy-recuperation system |
| CN108678048B (en) * | 2018-05-25 | 2021-01-29 | 太原理工大学 | Energy storage lifting system driven by liquid and electricity in hybrid mode |
| WO2021035475A1 (en) * | 2019-08-26 | 2021-03-04 | Guangxi Liugong Machinery Co., Ltd. | Loader |
| CN115288233A (en) * | 2022-07-09 | 2022-11-04 | 西安方元明鑫精密机电制造有限公司 | Energy recovery power management control system of electric cylinder for excavator |
| CN116034659A (en) * | 2023-01-30 | 2023-05-02 | 青岛理工大学 | Electric drive lifting system with energy recovery function for agricultural machinery |
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