CN107524187B - Hydraulic-electric hybrid recycling system for braking energy of rotary motion - Google Patents
Hydraulic-electric hybrid recycling system for braking energy of rotary motion Download PDFInfo
- Publication number
- CN107524187B CN107524187B CN201710830476.1A CN201710830476A CN107524187B CN 107524187 B CN107524187 B CN 107524187B CN 201710830476 A CN201710830476 A CN 201710830476A CN 107524187 B CN107524187 B CN 107524187B
- Authority
- CN
- China
- Prior art keywords
- hydraulic
- oil port
- motor
- way electromagnetic
- valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2217—Hydraulic or pneumatic drives with energy recovery arrangements, e.g. using accumulators, flywheels
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2246—Control of prime movers, e.g. depending on the hydraulic load of work tools
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
A hydraulic-electric hybrid recycling system for braking energy generated by rotary motion is additionally provided with a two-position two-way electromagnetic reversing valve, a damping hole, a two-position four-way electromagnetic reversing valve, a two-position three-way hydraulic control reversing valve, a proportional pilot overflow valve, an oil tank, a displacement sensor, a hydraulic energy accumulator, a two-variable piston, a hydraulic motor/pump, a DC-DC converter, a super capacitor, a power switch, a motor rotating speed controller and a motor/generator, realizes the controllable recycling of stored energy without throttling and short conversion chain through the volume regulation and control of pressure or torque, improves the recycling efficiency of energy, reduces the complexity of a control system and improves the usability.
Description
Technical Field
The invention relates to a hydraulic-electric hybrid recycling system for braking energy of rotary motion, in particular to a hydraulic-electric hybrid recycling system for braking energy of rotary motion (including rotation and walking) of equipment such as a hydraulic excavator.
Background
With the rapid development of equipment manufacturing industry in China, the product yield of hydraulic excavators, loaders, automobile cranes and the like leaps to the top of the world, and becomes one of the important prop industries in China. In these equipment operations, the kinetic energy of the upper vehicle in turning and traveling is large, and acceleration and deceleration are very frequent, and if the braking kinetic energy is not effectively regenerated, a very large energy loss occurs. Therefore, how to recycle the energy efficiently and find a high-efficiency and energy-saving hydraulic rotation system plays an important role in improving the overall energy efficiency of engineering equipment.
At present, the method for recycling the braking energy of the rotary motion mainly comprises the following steps: the energy accumulator is used for directly recovering the braking kinetic energy, the secondary regulation technology is adopted, and the closed loop method and the hybrid power method are adopted. For example, in patent document (CN 105008729A), an energy regeneration system for a construction machine is proposed, in which braking energy is recycled by a regeneration device composed of a hydraulic motor, an electric motor and a storage battery (or a super capacitor bank) by using a hybrid method, and a throttle valve is provided in front of the energy recovery hydraulic motor for regulation in order to overcome torque impact generated by a large inertia load at the beginning of braking, so that the stability of the braking process is improved, but the throttling loss is increased, and the method needs to be converted for multiple times to recycle energy, and the efficiency is low.
Analyzing the existing recycling method, for recycling the kinetic energy of the rotary motion mechanism, an electric mode, a hydraulic accumulator mode and a composite mode thereof are adopted, in order to improve the controllability of the system, balance the large torque requirement at the initial stage of kinetic energy recycling and obtain good operation characteristics, a method of firstly throttling and then recycling is adopted, the energy utilization efficiency is reduced, and larger secondary throttling loss is generated during regeneration.
Disclosure of Invention
Aiming at the defects of the existing engineering equipment in the rotation and walking processes, the invention provides a rotary motion braking energy hydraulic-electric hybrid recycling system, which realizes the controllable recycling of stored energy without throttling and short conversion chains by volume regulation and control of pressure or torque, improves the energy recycling efficiency, reduces the complexity of a control system and improves the controllability.
In order to achieve the above object, the present invention adopts the following technical solutions.
The utility model provides a rotary motion braking energy liquid electricity mixes recycle system, includes hydraulic motor, power supply, main control circuit, check valve group, its characterized in that:
the hydraulic control system is additionally provided with an I-th and an II-th two-position two-way electromagnetic directional valves, an I-III damping hole with serial numbers from I to III in sequence, a two-position four-way electromagnetic directional valve, a two-position three-way hydraulic control directional valve, a proportional pilot overflow valve, an oil tank, a displacement sensor, a hydraulic energy accumulator, a first variable piston, a second variable piston, a hydraulic motor/pump, a DC-DC converter, a super capacitor, a power switch, a motor rotating speed controller and a motor/generator; the input end of the motor/generator is connected with the output end of the motor rotating speed controller, and the output end of the motor/generator is connected with and drives the hydraulic motor/pump; the DC-DC converter and the super capacitor are connected in parallel to the motor rotating speed controller;
an oil port F of the hydraulic motor/pump is connected with the hydraulic energy accumulator, and an oil port E of the hydraulic motor/pump with continuously adjustable electric proportional pressure is respectively communicated with a left control cavity of the two-position three-way hydraulic control reversing valve, an oil port G of the two-position four-way electromagnetic reversing valve and an oil inlet of the damping hole I; the oil outlet of the first damping hole is communicated with the right control cavity of the two-position three-way hydraulic control reversing valve and the oil inlet of the proportional pilot overflow valve respectively; the two-position four-way electromagnetic directional valve oil port H, J, K is respectively connected with the oil tank and the two-position three-way hydraulic control directional valve oil ports M and P; an oil port N of the two-position three-way hydraulic control reversing valve is communicated with the rodless cavity of the first variable piston through a second damping hole and is communicated with an oil tank through a third damping hole; the displacement sensor is connected with a piston rod of the second variable piston;
an oil port A of the first two-position two-way electromagnetic reversing valve and an oil port C of the second two-position two-way electromagnetic reversing valve are respectively communicated with an oil port Q and an oil port P of the hydraulic motor, an oil port B of the first two-position two-way electromagnetic reversing valve is respectively communicated with an oil port E of the hydraulic motor/pump and an oil port G of the two-position four-way electromagnetic reversing valve, and an oil port D of the second two-position two-way electromagnetic reversing valve is respectively communicated with the oil port E of the hydraulic motor/pump and a left control cavity of the two-position three-way hydraulic control reversing valve;
further, the system for recycling the braking energy generated by the rotary motion through the hydro-electric hybrid is characterized in that: the main control loop can be a negative flow control loop, a positive flow control loop, an inlet and outlet independent control loop or a closed pump control loop and the like; and the main control circuit controls the running direction and the speed of the hydraulic motor according to the operation instruction.
Further, the system for recycling the braking energy generated by the rotary motion through the hydro-electric hybrid is characterized in that: the rotary motion braking energy hydraulic-electric hybrid recycling system has two working modes of energy storage and regeneration, when the two-position four-way electromagnetic reversing valve is in the left position, the rotary motion braking energy hydraulic-electric hybrid recycling system works in the energy storage mode, due to the fact that the running speed is high, kinetic energy is required to be stored in the hydraulic energy accumulator and the super capacitor within a short time in the braking process, a hydraulic motor/pump is adopted, the hydraulic motor/pump cooperates with an electric motor/generator to quickly establish braking torque, the braking torque can be regulated and controlled according to the angle requirement of braking, and controllable braking is achieved. When the two-position four-way electromagnetic directional valve is in the right position, the two-position four-way electromagnetic directional valve works in a regeneration mode, and a pressure matching mode (the rotating speed of the pump is unchanged, the outlet pressure is controlled) and a flow matching mode (the set pressure value is higher, the rotating speed of the pump is changed, and the flow is controlled) can control the regeneration flow; the recovery without throttling loss and the utilization of the braking kinetic energy of the rotating mechanism are realized.
Compared with the prior art, the technical scheme of the invention has the following advantages and positive effects.
The system recycles the kinetic energy of the hydraulic rotating mechanism without throttling loss, and has high recycling efficiency.
The system integrates energy storage and recycling, hydraulic and electric energy storage is realized, the recovered energy is directly utilized to reduce the installed power of the host, the system heating is reduced, the sustainable working time of the machine is prolonged, the cooling power is reduced, and the problems that the hydraulic oil tank of the engineering equipment is small and the hydraulic oil is easy to age due to long-term high-temperature work are solved.
The energy recycling unit of the system can be used as an active positive displacement pressure control device to replace the existing energy consumption type element to control the pressure of a hydraulic system.
The energy recycling unit of the system can be used as an independent control unit to be attached to various existing hosts, the controllability of the existing machine is not affected, and the system is high in universality.
Drawings
Fig. 1 is a schematic configuration diagram of a system according to embodiment 1 of the present invention.
Fig. 2 is a schematic configuration diagram of a system according to embodiment 2 of the present invention.
Fig. 3 is a schematic configuration diagram of a system according to embodiment 3 of the present invention.
Fig. 4 is a schematic configuration diagram of a system according to embodiment 4 of the present invention.
In the figure, 1 is a hydraulic motor, 2 is a first two-position two-way electromagnetic reversing valve, 3 is a second two-position two-way electromagnetic reversing valve, 4a is a first damping hole, 4b is a second damping hole, 4c is a third damping hole, 5 is a two-position four-way electromagnetic reversing valve, 6 is a two-position three-way hydraulic control reversing valve, 7 is a proportional pilot overflow valve, 8 is an oil tank, 9 is a displacement sensor, 10 is a hydraulic accumulator, 11a is a first variable piston, 11b is a second variable piston, 12 is a hydraulic motor/pump, 13 is a DC-DC converter, 14 is a super capacitor, 15 is a power switch, 16 is a power source, 17 is a main control loop, 18a ~ 18b is a one-way valve bank, 19 is a motor rotating speed controller, and 20 is an electric motor/generator.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
Example 1
The following describes the embodiment 1 of the present invention with reference to fig. 1.
As shown in the attached figure 1, in the specific implementation, a power source 16 adopts a diesel engine, a hydraulic motor 1 adopts a quantitative motor, a pressure continuously adjustable hydraulic motor/pump 12 adopts an axial plunger structural principle, a hydraulic accumulator 10 is a piston type, a motor/generator 20 adopts a permanent magnet synchronous structure, a motor rotating speed controller 19 adopts a vector control mode, a super capacitor 14 is formed by combining basic modules in series and parallel, a DC-DC converter 13 can bidirectionally increase and reduce the pressure, an external power supply adopts a battery pack, the diameter of a first damping hole 4a is 0.9 mm, a motor/pump mode switching valve adopts an electric control mode, a two-position three-way hydraulic control reversing valve 6 is a hydraulic control three-way slide valve, the diameter of a second damping hole 4b is 1 mm, a proportional pilot overflow valve 7 adopts a cone valve structure, and the diameter of a variable hydraulic cylinder rodless cavity is 40 mm, the hydraulic motor/pump 12 adopts an axial plunger structural form, the diameter of the III damping hole 4c is 0.8 mm, the straight diameter of a rod cavity of the variable hydraulic cylinder is 30 mm, the volume of the oil tank 8 is 200L, and the displacement sensor 9 adopts a differential transformer structure.
The structural system relationship of the implementation technical scheme is that the input end of a motor/generator 20 is connected with the output end of a motor rotating speed controller 19, and the output end of the motor/generator 20 is connected with a driving hydraulic motor/pump 12; the DC-DC converter 13 and the super capacitor 14 are connected in parallel to a motor speed controller 19.
An oil port F of the hydraulic motor/pump 12 is connected with the hydraulic accumulator 10, and an oil port E of the hydraulic motor/pump 12 with continuously adjustable electric proportional pressure is respectively communicated with a left control cavity of the two-position three-way hydraulic control reversing valve 6, an oil port G of the two-position four-way electromagnetic reversing valve 5 and an oil inlet of the damping hole I4 a; an oil outlet of the first damping hole 4a is respectively communicated with a right control cavity of the two-position three-way hydraulic control reversing valve 6 and an oil inlet of the proportional pilot overflow valve 7; an oil port H, J, K of the two-position four-way electromagnetic directional valve 5 is respectively communicated with an oil tank 8 and oil ports M and P of the two-position three-way hydraulic control directional valve 6; an oil port N of the two-position three-way hydraulic control reversing valve 6 is communicated with a rodless cavity of the first variable piston through a second damping hole 4 b; meanwhile, the damping hole III is communicated with an oil tank 8 through a damping hole III 4 c; the displacement sensor 9 is communicated with a piston rod of the second variable piston.
An oil port A of the first two-position two-way electromagnetic directional valve 2 and an oil port C of the second two-position two-way electromagnetic directional valve 3 are respectively communicated with oil ports Q and P of the hydraulic motor 1; an oil port B of the first two-position two-way electromagnetic directional valve 2 is respectively communicated with an oil port E of the hydraulic motor/pump 12 and an oil port G of the two-position four-way electromagnetic directional valve 5; an oil port D of the second two-position two-way electromagnetic directional valve 3 is respectively communicated with an oil port E of the hydraulic motor/pump 12 and a left control cavity of the two-position three-way hydraulic control directional valve 6,
further embodiments are: a main control loop of the rotary motion braking energy hydraulic-electric hybrid recycling system is a negative flow control loop, and the main control loop controls the running direction and the speed of the hydraulic motor according to an operation instruction.
Further embodiments are also characterized in that: the rotary motion braking energy hydraulic-electric hybrid recycling system has two working modes of energy storage and regeneration, when the two-position four-way electromagnetic directional valve 5 is in the left position, the rotary motion braking energy hydraulic-electric hybrid recycling system works in the energy storage mode, because the running speed is high, the kinetic energy is required to be stored into the hydraulic energy accumulator 10 and the super capacitor 14 in a short time in the braking process, the hydraulic motor/pump 12 is adopted to cooperate with the motor/generator 20 to quickly establish braking torque, and the braking torque can be regulated and controlled according to the braking angle requirement, so that controllable braking is realized; when the two-position four-way electromagnetic directional valve 5 is positioned at the right position, the two-position four-way electromagnetic directional valve works in a regeneration mode and a pressing force matching mode: if the pump rotating speed is not changed, controlling the outlet pressure; and (3) flow matching mode: if the set pressure value is higher, the rotating speed of the pump is changed to control the flow, the regeneration flow is controlled, and the recovery without throttling loss and the utilization of the braking kinetic energy of the rotating mechanism are realized.
Example 2
The following describes the embodiment 2 of the present invention with reference to fig. 2.
As shown in fig. 2, the connection and operation of the respective components in this embodiment are the same as those in embodiment 1, except that the main control loop is a positive flow control loop. The hydraulic pump is an electronic proportional control variable displacement pump, and the displacement of the hydraulic pump is in direct proportion to the set signal, namely the set signal is increased, and the displacement of the hydraulic pump is also increased.
Example 3
The following describes embodiment 3 of the present invention with reference to fig. 3.
As shown in fig. 3, the connection and operation of the components in this embodiment are the same as those in embodiment 1, except that the main control loop is an inlet-outlet independent control loop. The main control valve is composed of two three-position three-way proportional direction valves, a working oil port of the first proportional direction valve is communicated with an oil port P of the hydraulic motor 1, a working oil port of the second proportional direction valve is communicated with an oil port Q of the hydraulic motor 1, and an oil outlet of the hydraulic pump is communicated with oil inlets of the first proportional direction valve and the second proportional direction valve.
Example 4
The following describes embodiment 4 of the present invention with reference to fig. 4.
As shown in fig. 4, the connection and operation of the components in this embodiment are the same as those in embodiment 1, except that the main control circuit is a closed pump control circuit. The hydraulic pump is a bidirectional variable hydraulic pump, and two oil ports of the hydraulic pump are respectively communicated with oil ports P and Q of the hydraulic motor.
Claims (3)
1. A hydraulic-electric hybrid recycling system for braking energy of rotary motion comprises a hydraulic motor (1), a power source (16), a main control loop (17) and a check valve bank (18); the method is characterized in that:
the hydraulic control system is additionally provided with an I two-position two-way electromagnetic directional valve (2), an II two-position two-way electromagnetic directional valve (3), an I damping hole (4 a), an II damping hole (4 b), an III damping hole (4 c), a two four-way electromagnetic directional valve (5), a two three-position three-way hydraulic control directional valve (6), a proportional pilot overflow valve (7), an oil tank (8), a displacement sensor (9), a hydraulic energy accumulator (10), a first variable piston (11 a), a second variable piston (11 b), a hydraulic motor/pump (12), a DC-DC converter (13), a super capacitor (14), a power switch (15), a motor rotating speed controller (19) and a motor/generator (20);
the input end of the motor/generator (20) is connected with the output end of the motor rotating speed controller (19), and the output end of the motor/generator is connected with the hydraulic motor/pump (12);
the DC-DC converter (13) and the super capacitor (14) are connected into the motor rotating speed controller (19) in parallel;
an oil port F of the hydraulic motor/pump (12) is communicated with the hydraulic energy accumulator (10), and an oil port E is respectively communicated with a left control cavity of the two-position three-way hydraulic control reversing valve (6), an oil port G of the two-position four-way electromagnetic reversing valve (5) and an oil inlet of the damping hole I (4 a);
an oil outlet of the first damping hole (4 a) is communicated with a right control cavity of the two-position three-way hydraulic control reversing valve (6) and an oil inlet of the proportional pilot overflow valve (7) respectively;
an oil port H, an oil port J and an oil port K of the two-position four-way electromagnetic reversing valve (5) are respectively communicated with an oil tank (8), an oil port M of the two-position three-way hydraulic control reversing valve and an oil port P of the two-position three-way hydraulic control reversing valve;
an oil port N of the two-position three-way hydraulic control reversing valve (6) is communicated with a rodless cavity of the first variable piston (11 a) through a second damping hole (4 b) and is communicated with an oil tank (8) through a third damping hole (4 c); the displacement sensor (9) is connected with a piston rod of the second variable piston (11 b);
the hydraulic control system is characterized in that an oil port A of the first two-position two-way electromagnetic directional valve (2) and an oil port C of the second two-position two-way electromagnetic directional valve (3) are respectively communicated with an oil port Q of the hydraulic motor (1) and an oil port P of the hydraulic motor (1), an oil port B of the first two-position two-way electromagnetic directional valve (2) is respectively communicated with an oil port E of the hydraulic motor/pump (12) and an oil port G of the two-position four-way electromagnetic directional valve (5), and an oil port D of the second two-position two-way electromagnetic directional valve (3) is respectively communicated with an oil port E of the hydraulic motor/pump (12) and a left control cavity of the two-position three-way hydraulic control directional valve (6).
2. The rotary motion braking energy hydro-electric hybrid recovery and utilization system of claim 1, wherein: the main control loop is a negative flow control loop, a positive flow control loop, an inlet and outlet independent control loop or a closed pump control loop, and the main control loop controls the running direction and the speed of the hydraulic motor (1) according to an operation instruction.
3. The rotary motion braking energy hydro-electric hybrid recovery and utilization system of claim 1, wherein: the recycling system has two working modes of energy storage and regeneration, and when the two-position four-way electromagnetic directional valve (5) is in the left position, the recycling system is in the energy storage mode; when the two-position four-way electromagnetic directional valve (5) is in the right position, the regeneration mode is adopted, the regeneration flow is controlled by the pressing force matching mode and the flow matching mode, and the throttling loss-free recovery and the utilization of the braking kinetic energy of the rotating mechanism are realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710830476.1A CN107524187B (en) | 2017-09-15 | 2017-09-15 | Hydraulic-electric hybrid recycling system for braking energy of rotary motion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710830476.1A CN107524187B (en) | 2017-09-15 | 2017-09-15 | Hydraulic-electric hybrid recycling system for braking energy of rotary motion |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107524187A CN107524187A (en) | 2017-12-29 |
| CN107524187B true CN107524187B (en) | 2020-01-07 |
Family
ID=60736863
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710830476.1A Active CN107524187B (en) | 2017-09-15 | 2017-09-15 | Hydraulic-electric hybrid recycling system for braking energy of rotary motion |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107524187B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108869462A (en) * | 2018-06-20 | 2018-11-23 | 浙江大学 | A kind of hydraulic cushion of hydraulic press device with energy recovery function |
| CN114855923B (en) * | 2022-05-30 | 2024-03-15 | 柳州柳工挖掘机有限公司 | Rotary kinetic energy recovery device and excavator |
| CN116658493B (en) * | 2023-08-01 | 2023-10-24 | 华侨大学 | Negative flow system and electric engineering mechanical device based on variable rotation speed and variable displacement |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009008136A (en) * | 2007-06-27 | 2009-01-15 | Hitachi Constr Mach Co Ltd | Rotation control device for construction machine |
| CN104246237A (en) * | 2012-04-10 | 2014-12-24 | 日立建机株式会社 | Hydraulic drive device of construction machine |
| CN104822952A (en) * | 2012-12-13 | 2015-08-05 | 神钢建机株式会社 | Hydraulic circuit for construction machine |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20110077061A (en) * | 2009-12-30 | 2011-07-07 | 볼보 컨스트럭션 이큅먼트 에이비 | Swing moter control method for excavator in open center hydraulic control system |
-
2017
- 2017-09-15 CN CN201710830476.1A patent/CN107524187B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009008136A (en) * | 2007-06-27 | 2009-01-15 | Hitachi Constr Mach Co Ltd | Rotation control device for construction machine |
| CN104246237A (en) * | 2012-04-10 | 2014-12-24 | 日立建机株式会社 | Hydraulic drive device of construction machine |
| CN104822952A (en) * | 2012-12-13 | 2015-08-05 | 神钢建机株式会社 | Hydraulic circuit for construction machine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107524187A (en) | 2017-12-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104196080B (en) | Variable speed volume directly drives pure electric hydraulic crawler excavator and drives and energy-recuperation system | |
| CN107420384B (en) | System is used in the storage of lifting device gravitional force P-V | |
| US10047768B2 (en) | Double-loop control system with single hydraulic motor | |
| CN102587444B (en) | Oil hybrid system for excavator with energy differential recovery | |
| CN102094434B (en) | System for differential recovery of potential energy of boom of oil liquid hybrid power excavating machine | |
| CN202081450U (en) | Potential energy differential recovery system for moving arm of oil-liquid hybrid power excavator | |
| CN103741755B (en) | A kind of excavator energy-recuperation system | |
| CN108755794B (en) | Hydraulic excavator based on hydraulic-electric composite drive | |
| CN104196067B (en) | Point chamber independence variable speed volume directly drives pure electro-hydraulic pressure excavator energy-recuperation system | |
| CN107700576B (en) | Kinetic potential energy recycling system of hydraulic excavator | |
| CN107524187B (en) | Hydraulic-electric hybrid recycling system for braking energy of rotary motion | |
| CN202787369U (en) | Hydraumatic excavating energy saving system | |
| CN104452868B (en) | Double-hydraulic-cylinder mixed drive control system | |
| CN110258684A (en) | A kind of energy saver of excavator swing arm single cylinder pressure-bearing energy regenerating and recycling | |
| CN108591144B (en) | Hydraulic system of motor-driven double-dosing pump double-accumulator distributed direct-drive excavator | |
| CN107503395B (en) | Throttling volume direct-drive composite oil inlet and outlet independent control electro-hydraulic system | |
| CN103628519A (en) | Excavator rotation brake energy recovery system | |
| CN110030304A (en) | A kind of coordinated drive and passive active brake method of large inertia load | |
| US20230151830A1 (en) | Hydraulic-electric coupling driven multi-actuator system and control method | |
| CN103362171A (en) | Hydraulic hybrid power excavator hydraulic system with switching control function | |
| CN110778551B (en) | Full-closed hydraulic system of crane | |
| CN116240941A (en) | Servo pump control system for excavator movable arm and energy regulation and control method | |
| CN103397677B (en) | Based on hydraulic excavator movable arm loop and the control method thereof of hydraulic transformer | |
| CN107489671A (en) | Hybrid power engineering machinery multi executors control system | |
| CN108488120B (en) | Hydraulic system of distributed direct-drive excavator with single variable pump driven by servo motor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |