CN114606995B - Electric hydraulic system and loader - Google Patents
Electric hydraulic system and loader Download PDFInfo
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- CN114606995B CN114606995B CN202210324633.2A CN202210324633A CN114606995B CN 114606995 B CN114606995 B CN 114606995B CN 202210324633 A CN202210324633 A CN 202210324633A CN 114606995 B CN114606995 B CN 114606995B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
- E02F3/36—Component parts
- E02F3/42—Drives for dippers, buckets, dipper-arms or bucket-arms
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- 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
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- 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
- E02F9/2058—Electric or electro-mechanical or mechanical control devices of vehicle sub-units
- E02F9/2062—Control of propulsion units
- E02F9/207—Control of propulsion units of the type electric propulsion units, e.g. electric motors or generators
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- 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
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- 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
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- 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
- E02F9/2267—Valves or distributors
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- 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
- E02F9/2278—Hydraulic circuits
- E02F9/2292—Systems with two or more pumps
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Operation Control Of Excavators (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention discloses an electric hydraulic system and a loader, wherein the electric hydraulic system comprises a closed hydraulic system for realizing lifting and descending of a movable arm and a hydraulic system for realizing steering of the whole loader and action of a tipping bucket oil cylinder, the closed hydraulic system maintains volume difference of large and small cavities of the movable arm oil cylinder through a gear pump and an energy accumulator, a motor M1 drives a bidirectional pump-motor to act, the closed hydraulic system is connected with an inverter through a motor controller M1, the inverter is connected with a common direct current bus, and the movable arm potential energy recovery of the electric loader is realized by utilizing an electric control technology of the inverter and the common direct current bus, so that the cruising ability of the electric loader is improved. The invention solves the problems of high energy loss and limited cruising ability of the loader in the prior art.
Description
Technical Field
The invention relates to an electro-hydraulic system and a loader, and belongs to the technical field of engineering machinery.
Background
In the prior art, a hydraulic system of a loader generally mainly comprises a working hydraulic system and a steering hydraulic system, and the working hydraulic system is implemented in an open system from a quantitative hydraulic system, a fixed variable hydraulic system to a full variable hydraulic system. The quantitative hydraulic system has high-pressure overflow loss; the constant-variable hydraulic system realizes variable during steering, but is still used as a quantitative system during working, and overflow loss also exists; the all-variable hydraulic system realizes variable in steering and working, but the hydraulic system is complex and has higher cost for manufacturing, maintaining and the like.
In order to realize the aim of 'double carbon', the engineering machinery also generates a green new energy technology, and particularly, the loader promotes the development of green new technologies such as 'hydrostatic drive', 'pure electric drive', and the like. However, the hydraulic system of the electric loader is still basically consistent with the hydraulic system of the fuel vehicle, and the problem of energy loss is not solved better. Meanwhile, the electric loader is limited by cruising ability, and is not popularized and applied in all directions in the market.
Disclosure of Invention
In order to solve the defects of the prior art, the invention aims to provide an electro-hydraulic system and a loader, and solves the problems of high energy loss and limited cruising ability of the loader in the prior art.
In order to achieve the above object, the present invention adopts the following technical solutions:
an electric hydraulic system comprises a closed hydraulic system for realizing lifting and descending of a movable arm, wherein the closed hydraulic system comprises a bidirectional double-speed pump-motor, an energy accumulator, a first electromagnetic directional valve, a first one-way valve, a second electromagnetic directional valve, a movable arm hydraulic cylinder, a gear pump, a third electromagnetic directional valve, a hydraulic oil tank, a motor M1 and a second operating handle;
oil ports of a large cavity and a small cavity of the movable arm hydraulic cylinder are respectively connected with oil outlets of a third electromagnetic directional valve and a second electromagnetic directional valve, and oil inlets of the second electromagnetic directional valve and the third electromagnetic directional valve are respectively connected with ports A and B of the bidirectional double-speed pump-motor;
an oil suction port of the gear pump is connected with a hydraulic oil tank, an oil outlet of the gear pump is connected with an oil inlet of the first electromagnetic reversing valve, an oil outlet of the gear pump is connected with a port A of the bidirectional double-speed pump-motor through the first one-way valve, an oil outlet of the gear pump is also connected with a port B of the bidirectional double-speed pump-motor through the second one-way valve, and an oil outlet of the first electromagnetic reversing valve is connected with the energy accumulator;
the motor M1 drives the bidirectional double-speed pump-motor to act, and is connected with an inverter through the M1 motor controller, and the inverter is connected with a common direct-current bus;
the second operating handle is used for realizing the lifting and descending of the movable arm.
Furthermore, the bidirectional two-speed pump-motor comprises a reversing valve, and when the port B of the bidirectional two-speed pump-motor is at a high pressure, the reversing valve is in a second working position, so that only a single pump of the bidirectional two-speed pump-motor is in a working state; when the B port of the bidirectional two-speed pump-motor is at low pressure, the reversing valve is in the first working position, and two motors of the bidirectional two-speed pump-motor are in a working state at the same time.
Furthermore, the hydraulic oil tank further comprises a first overflow valve, an oil inlet of the first overflow valve is connected with an oil outlet of the gear pump, and an oil outlet of the first overflow valve is communicated with the hydraulic oil tank.
Furthermore, the oil inlet of the second overflow valve is connected with the ports A and B of the bidirectional two-speed pump-motor through the third check valve and the fifth check valve respectively.
Furthermore, the power battery is further included and connected with the common direct current bus.
Furthermore, the hydraulic system for realizing the steering of the whole machine and the action of the tipping bucket oil cylinder comprises a hydraulic pump, a priority valve, an electric proportional reversing valve, a steering hydraulic cylinder, a tipping bucket hydraulic cylinder, a first operating handle and a hydraulic steering gear provided with a steering sensor,
an oil inlet P port of the priority valve is connected with an oil outlet of the hydraulic pump, a CF port of a first working oil port of the priority valve is connected with an oil inlet of the hydraulic steering gear, and an oil outlet of the hydraulic steering gear is connected with a steering hydraulic cylinder;
a second working oil port EF of the priority valve is connected with an oil inlet of the electric proportional reversing valve, two working oil ports of the electric proportional reversing valve are respectively connected with a large cavity and a small cavity of the tipping bucket hydraulic cylinder, and an oil return port of the electric proportional reversing valve is connected with a hydraulic oil tank;
the first operating handle controls the action of the electric proportional directional valve.
Furthermore, the device also comprises a motor M2 for driving the hydraulic pump to operate, wherein the motor M2 is connected with an inverter through an M2 motor controller, and the inverter is connected with a common direct current bus.
Further, the motor M3 for providing power for the traveling system is further included, the motor M3 is connected with an inverter through an M3 motor controller, and the inverter is connected with a common direct current bus.
Further, the steering control system further comprises a complete machine control unit ECU, wherein the complete machine control unit ECU is respectively connected with the M1 motor controller, the M2 motor controller, the M3 motor controller, the first electromagnetic directional valve, the second electromagnetic directional valve, the third electromagnetic directional valve, the electric proportional directional valve, the first operating handle, the second operating handle and a steering sensor of the hydraulic steering gear.
A loader comprising an electro-hydraulic system of any one of the preceding claims.
The invention has the following beneficial effects:
1. the lifting and descending of the movable arm adopt a closed hydraulic system, so that the problem of high energy consumption and loss is greatly reduced, and meanwhile, when a certain condition is met, the gear pump reduces the rotating speed, so that the power consumption is further reduced;
2. the potential energy of the movable arm is recovered by descending of the movable arm, and the potential energy of the movable arm of the electric loader is recovered by utilizing an electric control technology of the inverter and the common direct current bus, so that the cruising ability of the electric loader is improved.
Drawings
FIG. 1 is a schematic block diagram of a hydraulic system according to an embodiment of the present invention;
fig. 2 is a connection diagram of the complete machine control unit ECU according to the embodiment of the present invention.
The meaning of the reference symbols in the figures: 1-a power battery; 2-bidirectional two-speed pump-motor; 3-an accumulator; 4-a first electromagnetic directional valve; 5-a first one-way valve; 6-a second one-way valve; 7-a first overflow valve; 8-a third one-way valve; 9-a second electromagnetic directional valve; 10-a second overflow valve; 11-boom cylinder; 12-gear pump; 13-a diverter valve; 14-a fourth one-way valve; 15-a third electromagnetic directional valve; 16-a hydraulic pump; 17-a priority valve; 18-an electrically proportional reversing valve; 19-a hydraulic steering gear; 20-a steering hydraulic cylinder; 21-tipping bucket hydraulic cylinder; 22-a hydraulic oil tank; 23-fifth one-way valve.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Fig. 1 shows a schematic structural diagram of a hydraulic system according to the present embodiment, where the hydraulic system according to the present embodiment includes a closed hydraulic system for realizing lifting and lowering of a boom, and a hydraulic system for realizing steering of a whole machine and actuation of a dump bucket cylinder.
The hydraulic system for realizing the steering of the whole machine and the action of the tipping bucket oil cylinder comprises a steering hydraulic cylinder 20 for driving wheels to steer, a hydraulic steering gear 19 for realizing the steering of the steering cylinder, a priority valve 17, a hydraulic pump 16, an electric proportional reversing valve 18 and a tipping bucket hydraulic cylinder 21; the hydraulic pump 16 for supplying hydraulic fluid to the steering cylinder 20 and the dump truck cylinder 21 is driven by a motor M2, and an oil inlet of the hydraulic pump 16 is connected with a hydraulic oil tank 22.
An oil inlet P port of the priority valve 17 is connected with an oil outlet of the hydraulic pump 16, a first working oil port CF port of the priority valve is connected with an oil inlet of a hydraulic steering gear 19, and hydraulic fluid is provided for a steering hydraulic cylinder 20 through the hydraulic steering gear 19; a second working oil port EF of the priority valve 17 is connected with an oil inlet of the electric proportional reversing valve 18, two working oil ports of the electric proportional reversing valve 18 are respectively connected with a large cavity and a small cavity of the tipping bucket hydraulic cylinder 21, and an oil return port of the electric proportional reversing valve 18 is connected with a hydraulic oil tank 22.
The first control handle at the control end of the electric proportional reversing valve 18 is an electric control handle, and an output electric signal of the electric control handle is fed back to the whole machine control unit ECU, so that hydraulic fluid is supplied to the tipping bucket hydraulic oil cylinder according to the requirement.
The hydraulic steering gear 19 is a load sensing full hydraulic steering gear; the steering gear can extend or retract a piston rod of the steering hydraulic cylinder 20, as shown in fig. 1, wherein a rodless cavity of one steering hydraulic cylinder is communicated with an R port of the steering gear, and a rod cavity is communicated with an L port of the steering gear; the rodless cavity of the other steering hydraulic cylinder is communicated with the L port of the steering gear, and the rod cavity of the other steering hydraulic cylinder is communicated with the R port of the steering gear, so that the two steering hydraulic cylinders synchronously and reversely move, namely the piston rod of one steering hydraulic cylinder retracts in the process of extending the piston rod of the other steering hydraulic cylinder, the two steering hydraulic cylinders are matched to drive wheels to steer, and the speed of the movement of the steering hydraulic cylinders is controlled by the input of the steering gear. The hydraulic steering gear 19 realizes that a steering column is connected with a steering wheel through a steering sensor, the steering sensor detects a rotating speed signal and feeds the rotating speed signal back to an ECU (electronic control unit), and the ECU outputs a signal to a motor controller M2, so that the steering system can provide hydraulic fluid as required.
The closed hydraulic system for realizing lifting and descending of the movable arm comprises a two-way two-speed pump-motor 2, an energy accumulator 3, a first electromagnetic directional valve 4, a first one-way valve 5, a second one-way valve 6, a first overflow valve 7, a third one-way valve 8, a second electromagnetic directional valve 9, a second overflow valve 10, a movable arm hydraulic cylinder 11, a gear pump 12, a third electromagnetic directional valve 15, a hydraulic oil tank 22, a directional valve 13 and a fifth one-way valve 23.
Wherein, the boom cylinder 11 is used for driving the lifting and lowering of the loader work part; oil ports of a large cavity and a small cavity of the movable arm hydraulic cylinder 11 are respectively connected with oil outlets of a third electromagnetic directional valve 15 and a second electromagnetic directional valve 9; oil inlets of the second electromagnetic directional valve 9 and the third electromagnetic directional valve 15 are respectively connected with ports A and B of the bidirectional double-speed pump-motor 2; the bidirectional double-speed pump-motor 2 is driven by a motor M1 and is used for providing hydraulic fluid for a closed hydraulic system for realizing lifting and descending of a movable arm; the gear pump 12 is used for a closed system oil replenishing pump and mainly replenishes the accumulated difference oil in the large cavity and the small cavity of a movable arm oil cylinder, an oil suction port of the gear pump 12 is connected with an oil tank, an oil outlet of the gear pump is connected with an oil inlet of a first electromagnetic reversing valve 4, an oil outlet of the first electromagnetic reversing valve 4 is connected with an energy accumulator 3, an oil outlet of the gear pump 12 is respectively connected with ports A and B of a bidirectional double-speed pump-motor 2 through a first check valve 5 and a second check valve 6, an oil outlet of the gear pump 12 is also connected with an oil inlet of a first overflow valve 7, and an oil outlet of the first overflow valve 7 is communicated with a hydraulic oil tank 22; the energy accumulator 3 is used for storing or releasing oil;
the second control handle for controlling the lifting and descending of the movable arm is an electric control handle, and an output electric signal of the electric control handle is fed back to the whole machine control unit ECU to realize the lifting and descending of the movable arm of the loader.
The embodiment also comprises a walking motor M3 and a power battery 1, wherein the walking motor M3 is used for a whole machine walking system, and the power battery 1 is used for providing electric power for the hydraulic and walking systems and storing the recovered energy.
As shown in fig. 2, the whole machine control unit ECU is connected to the first electromagnetic directional valve 4, the second electromagnetic directional valve 9, the third electromagnetic directional valve 15, the M1 motor controller, the M2 motor controller, the M3 motor controller, the first operating handle, and the second operating handle, respectively.
The whole machine control unit ECU receives the signal of the operating handle, converts the signal and outputs the signal to the motor controller, and the specific operation process is as follows:
1. when a movable arm lifting signal is input by the second control handle, the whole machine control unit ECU receives the signal and controls the motor controller M1, meanwhile, the second electromagnetic directional valve 9 and the third electromagnetic directional valve 15 are electrified, the second electromagnetic directional valve 9 and the third electromagnetic directional valve 15 are changed from a first working position to a second working position, and oil inlets and oil outlets of the electromagnetic directional valves are communicated;
the motor M1 operates positively, at the moment, the port B of the bidirectional double-speed pump-motor 2 is communicated with the large cavity of the movable arm hydraulic cylinder 11 through the third electromagnetic directional valve 15, and the small cavity of the movable arm hydraulic cylinder 11 is communicated with the port A of the bidirectional double-speed pump-motor 2 through the second electromagnetic directional valve 9 to form a closed loop;
the port B of the bidirectional two-speed pump-motor 2 is at high pressure, so that the reversing valve 13 is at a second working position, only a single pump of the bidirectional two-speed pump-motor 2 is in a working state, and the oil inlet and the oil outlet of the other pump are directly communicated so as to be in an idling state;
at the moment, the first electromagnetic directional valve 4 is electrified, so that the first electromagnetic directional valve 4 is changed from the first working position to the second working position, and the oil inlet and the oil outlet of the electromagnetic directional valve are communicated. The oil suction port of the gear pump 12 communicates with the hydraulic oil tank 22. When the pressure in the energy accumulator 3 is lower than the pressure of the first overflow valve 7, the gear pump 12 outputs hydraulic fluid to the small cavity side of the movable arm oil cylinder 11 through the first check valve 5 and the second electromagnetic directional valve 9 to make up for the volume difference of the large cavity and the small cavity of the movable arm oil cylinder, so that a closed hydraulic system is realized, and meanwhile, the energy accumulator 3 is filled with the hydraulic fluid through the first electromagnetic directional valve 4; when the pressure in the energy accumulator 3 is equal to the pressure of the first overflow valve 7, the gear pump 12 reduces or stops rotating speed, output hydraulic fluid is reduced, and the volume difference of a large cavity and a small cavity of the movable arm oil cylinder 11 is made up mainly by releasing oil in the energy accumulator 3 to the small cavity side;
the second overflow valve 10 determines the pressure of the closed system of the movable arm, when the load pressure of the movable arm cylinder is greater than the set pressure of the second overflow valve 10, the second overflow valve 10 is opened, and the large and small cavities of the movable arm cylinder are respectively decompressed through the fourth check valve 14 and the third check valve 8, so that the elements of the closed hydraulic system are protected.
2. When the second control handle inputs a boom descending signal, the whole machine control unit ECU receives the signal and controls the motor controller M1, meanwhile, the second electromagnetic directional valve 9 and the third electromagnetic directional valve 15 are electrified, the second electromagnetic directional valve 9 and the third electromagnetic directional valve 15 are changed from the first working position to the second working position, and oil inlet and oil outlet of the electromagnetic directional valve are communicated.
The port B of the bidirectional double-speed pump-motor 2 is communicated with the large cavity of the movable arm hydraulic cylinder 11 through the third electromagnetic directional valve 15, and the small cavity of the movable arm hydraulic cylinder 11 is communicated with the port A of the bidirectional double-speed pump-motor 2 through the first electromagnetic directional valve 9 to form a closed loop.
The depression at port B of the two-way two-speed pump-motor 2 causes the reversing valve 13 to assume the first operating position, which causes the two-way two-speed pump-motor 2 to assume the two-motor operating condition. The motor runs to drag M1 to rotate reversely, and potential energy of the movable arm reduced is recovered by utilizing an electric control technology of an inverter and a common direct current bus.
At the moment, the first electromagnetic directional valve 4 is electrified, so that the first electromagnetic directional valve 4 is changed from a first working position to a second working position, the pressure in the energy accumulator 3 is lower than the pressure of the first overflow valve 7, hydraulic fluid of the gear pump 12 is filled into the energy accumulator 3 through the first electromagnetic directional valve 4, and when the pressure in the energy accumulator 3 is equal to the pressure of the first overflow valve 7, the oil in the energy accumulator is released to the small cavity side of the movable arm oil cylinder 11;
therefore, when the movable arm of the bidirectional two-speed pump-motor 2 is lifted, the single pump works, and the lifting time is ensured; when the movable arm descends, the double motors work to ensure that the pump-motor does not overspeed.
The above description is only exemplary of the present invention and should not be taken as limiting the invention, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (9)
1. The electric hydraulic system is characterized by comprising a closed hydraulic system for realizing lifting and descending of a movable arm, wherein the closed hydraulic system comprises a two-way two-speed pump-motor (2), an energy accumulator (3), a first electromagnetic reversing valve (4), a first one-way valve (5), a second one-way valve (6), a second electromagnetic reversing valve (9), a movable arm hydraulic cylinder (11), a gear pump (12), a third electromagnetic reversing valve (15), a hydraulic oil tank (22), a motor M1 and a second operating handle;
oil ports of a large cavity and a small cavity of the movable arm hydraulic cylinder (11) are respectively connected with oil outlets of a third electromagnetic reversing valve (15) and an oil outlet of a second electromagnetic reversing valve (9), and oil inlets of the second electromagnetic reversing valve (9) and the third electromagnetic reversing valve (15) are respectively connected with ports A and B of the bidirectional double-speed pump-motor (2);
an oil suction port of the gear pump (12) is connected with a hydraulic oil tank (22), an oil outlet of the gear pump (12) is connected with an oil inlet of the first electromagnetic reversing valve (4), an oil outlet of the gear pump (12) is connected with a port A of the bidirectional two-speed pump-motor (2) through the first one-way valve (5), an oil outlet of the gear pump (12) is also connected with a port B of the bidirectional two-speed pump-motor (2) through the second one-way valve (6), and an oil outlet of the first electromagnetic reversing valve (4) is connected with the energy accumulator (3);
the motor M1 drives the bidirectional double-speed pump-motor (2) to act, and is connected with an inverter through the M1 motor controller, and the inverter is connected with a common direct-current bus;
the second operating handle is used for realizing lifting and descending of the movable arm;
the bidirectional two-speed pump-motor (2) comprises a reversing valve (13), and when the B port of the bidirectional two-speed pump-motor (2) is at high pressure, the reversing valve (13) is in a second working position, so that only a single pump of the bidirectional two-speed pump-motor (2) is in a working state; when the B port of the bidirectional two-speed pump-motor (2) is at low pressure, the reversing valve (13) is in a first working position, so that two motors of the bidirectional two-speed pump-motor (2) are in a working state at the same time.
2. The electro-hydraulic system of claim 1, characterized by further comprising a first overflow valve (7), wherein an oil inlet of the first overflow valve (7) is connected with an oil outlet of the gear pump (12), and an oil outlet of the first overflow valve (7) is communicated with a hydraulic oil tank (22).
3. The electro-hydraulic system as set forth in claim 1, further comprising a second overflow valve (10), a third check valve (8) and a fifth check valve (25), wherein an oil inlet of the second overflow valve (10) is connected to ports a and B of the two-way two-speed pump-motor (2) through the third check valve (8) and the fifth check valve (25), respectively.
4. Electro-hydraulic system according to claim 1, characterized by further comprising a power battery (1), said power battery (1) being connected to a common dc bus.
5. The electro-hydraulic system of claim 1, further comprising a hydraulic system for realizing the steering of the whole machine and the action of the skip bucket cylinder, wherein the hydraulic system comprises a hydraulic pump (16), a priority valve (17), an electric proportional directional valve (18), a steering hydraulic cylinder (20), a skip bucket hydraulic cylinder (21), a first control handle, and a hydraulic steering gear (19) provided with a steering sensor,
an oil inlet P port of the priority valve (17) is connected with an oil outlet of the hydraulic pump (16), a first working oil port CF port of the priority valve (17) is connected with an oil inlet of a hydraulic steering gear (19), and an oil outlet of the hydraulic steering gear (19) is connected with a steering hydraulic cylinder (20);
a second working oil port EF port of the priority valve (17) is connected with an oil inlet of an electric proportional reversing valve (18), two working oil ports of the electric proportional reversing valve (18) are respectively connected with a large cavity and a small cavity of a tipping bucket hydraulic cylinder (21), and an oil return port of the electric proportional reversing valve (18) is connected with a hydraulic oil tank (22);
the first operating handle controls the action of the electric proportional directional valve (18).
6. The electro-hydraulic system of claim 5, further comprising a motor M2 for driving the hydraulic pump (16), wherein the motor M2 is connected to an inverter through a M2 motor controller, and the inverter is connected to a common DC bus.
7. The electro-hydraulic system of claim 6, further comprising a motor M3 for powering the traveling system, wherein the motor M3 is connected to an inverter through a M3 motor controller, and the inverter is connected to a common dc bus.
8. The electro-hydraulic system of claim 7, further comprising a complete machine control unit ECU, wherein the complete machine control unit ECU is respectively connected with the M1 motor controller, the M2 motor controller, the M3 motor controller, the first electromagnetic directional valve (4), the second electromagnetic directional valve (9), the third electromagnetic directional valve (15), the electric proportional directional valve (18), the first operating handle, the second operating handle and the steering sensor of the hydraulic steering gear (19).
9. A loader comprising an electro-hydraulic system as claimed in any one of claims 1 to 8.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210324633.2A CN114606995B (en) | 2022-03-30 | 2022-03-30 | Electric hydraulic system and loader |
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| CN202210324633.2A CN114606995B (en) | 2022-03-30 | 2022-03-30 | Electric hydraulic system and loader |
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| CN114606995B true CN114606995B (en) | 2022-11-11 |
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| GB2628795A (en) * | 2023-04-04 | 2024-10-09 | Caterpillar Inc | Electric work machine |
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| KR102425743B1 (en) * | 2015-08-21 | 2022-07-28 | 현대두산인프라코어(주) | Construction machinery and method for controlling the construction machinery |
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| CN101956405A (en) * | 2010-07-15 | 2011-01-26 | 吉林大学 | Gravitational potential energy recovery device during descending of engineering machinery movable arm |
| JP2012229776A (en) * | 2011-04-27 | 2012-11-22 | Yuken Kogyo Co Ltd | Hydraulic circuit for raising/lowering boom cylinder |
| US20160102686A1 (en) * | 2013-03-26 | 2016-04-14 | Doosan Infracore Co., Ltd. | Hydraulic system for construction equipment |
| CN105926696A (en) * | 2016-06-20 | 2016-09-07 | 浙江大学 | Excavator moving arm potential energy classified recovery and release device and method thereof |
| CN206052835U (en) * | 2016-09-18 | 2017-03-29 | 唐忠盛 | A kind of digitized electric hydraulic excavating machine |
| CN113175450A (en) * | 2021-05-14 | 2021-07-27 | 华侨大学 | Closed electro-hydraulic control system for mechanical arm of asymmetric cylinder |
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