CN113586532A - Construction machine - Google Patents

Construction machine Download PDF

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Publication number
CN113586532A
CN113586532A CN202111132345.9A CN202111132345A CN113586532A CN 113586532 A CN113586532 A CN 113586532A CN 202111132345 A CN202111132345 A CN 202111132345A CN 113586532 A CN113586532 A CN 113586532A
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CN
China
Prior art keywords
flow path
valve
hydraulic pump
hydraulic
inlet
Prior art date
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Granted
Application number
CN202111132345.9A
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Chinese (zh)
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CN113586532B (en
Inventor
耿家文
金月峰
宋之克
张箭
董玉忠
苗衡
卢杰
程易
张新奎
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xuzhou XCMG Excavator Machinery Co Ltd
Original Assignee
Xuzhou XCMG Excavator Machinery Co Ltd
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Application filed by Xuzhou XCMG Excavator Machinery Co Ltd filed Critical Xuzhou XCMG Excavator Machinery Co Ltd
Priority to CN202111132345.9A priority Critical patent/CN113586532B/en
Publication of CN113586532A publication Critical patent/CN113586532A/en
Application granted granted Critical
Publication of CN113586532B publication Critical patent/CN113586532B/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/021—Installations or systems with accumulators used for damping
    • 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
    • E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
    • E02F9/2267—Valves or distributors
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/024—Installations or systems with accumulators used as a supplementary power source, e.g. to store energy in idle periods to balance pump load
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/027—Check valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/20576—Systems with pumps with multiple pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
    • F15B2211/31523—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source and an output member
    • F15B2211/31535—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source and an output member having multiple pressure sources and a single output member

Abstract

The invention relates to an engineering machine, comprising: a working arm; the hydraulic cylinder comprises a rodless cavity, a rod cavity and a piston rod connected with the working arm; the reversing valve comprises an inlet, an outlet, a first working port communicated with the rodless cavity and a second working port communicated with the rod cavity; the first hydraulic pump is communicated with the inlet of the reversing valve in a switching mode; a hydraulic motor in selectable on-off communication with the first hydraulic pump; the second hydraulic pump is in transmission connection with the hydraulic motor and is communicated with the inlet of the reversing valve in a switching-on and switching-off mode, and the output pressure of the second hydraulic pump is different from that of the first hydraulic pump; the first accumulator is respectively communicated with the first hydraulic pump, the inlet of the reversing valve and the outlet of the reversing valve in a switching-on and switching-off mode; and the second accumulator is respectively communicated with the inlets of the second hydraulic pump and the reversing valve in a switching mode.

Description

Construction machine
Technical Field
The invention relates to the field of engineering equipment, in particular to engineering machinery.
Background
Fig. 1 shows a schematic configuration of a hydraulic system of an excavator of the related art, and as shown in fig. 1, the hydraulic system of the excavator includes a hydraulic cylinder 6 for driving a working arm to pitch and swing, a directional control valve 4 for controlling movement of the hydraulic cylinder 6, a hydraulic pump 3 for supplying hydraulic fluid to the hydraulic cylinder 6, and a hydraulic fluid tank 11 for containing hydraulic fluid.
Wherein the reversing valve 4 comprises an inlet communicating with the hydraulic pump 3, an outlet communicating with the hydraulic fluid tank 11, a first working port communicating with the rod chamber of the hydraulic cylinder 6 and a second working port communicating with the rodless chamber of the hydraulic cylinder 6. The directional valve 4 has a first state and a second state. When the reversing valve is in a first state, the first working port of the reversing valve is communicated with the inlet, and the second working port of the reversing valve is communicated with the outlet; in the second state, the second working port of the reversing valve is communicated with the inlet, and the first working port is communicated with the outlet. The change valve 4 further comprises a first pilot fluid port for introducing hydraulic fluid for switching it to the first state and a second pilot fluid port for introducing hydraulic fluid for switching it to the second state.
The hydraulic system further comprises a first pilot valve 1 communicated with the first pilot fluid port, a second pilot valve 2 communicated with the second pilot fluid port, and a pilot pump 9 communicated with the first pilot valve 1 and the second pilot valve 2.
The hydraulic system further comprises an accumulator 7 communicating with the rodless chamber of the hydraulic cylinder 6, a control valve 8 communicating with the accumulator 7 and an energy release motor 10 communicating with the control valve 8. The hydraulic system also comprises a one-way valve 5, an inlet of the one-way valve 5 is communicated with a second working port of the reversing valve 4, and an outlet of the one-way valve 5 is communicated with a rodless cavity of the hydraulic cylinder.
In order to achieve the purpose of energy conservation, hydraulic fluid in a rodless cavity of the hydraulic cylinder 6 enters the energy accumulator 7 for storage in the process of descending the working arm of the excavator, and drives the energy release motor 10 to rotate after passing through the control valve 8, so that energy is recycled, and an energy-saving effect is achieved.
In the ascending and descending processes of a working arm of the excavator, the load fluctuation of the hydraulic pump 3 is large, so that the load fluctuation of an engine for driving the hydraulic pump 3 is large, the fuel efficiency is low, and the installed power of the engine is high.
Disclosure of Invention
The invention aims to provide a construction machine to solve the problem of low fuel efficiency caused by large load fluctuation of an engine of a hydraulic system for driving a hydraulic pump in the related art.
According to an aspect of an embodiment of the present invention, there is provided a construction machine including: a working arm; the hydraulic cylinder comprises a rodless cavity, a rod cavity and a piston rod connected with the working arm; the reversing valve comprises an inlet, an outlet, a first working port communicated with the rodless cavity and a second working port communicated with the rod cavity; the first hydraulic pump is communicated with the inlet of the reversing valve in a switching mode; a hydraulic motor in selectable on-off communication with the first hydraulic pump; the second hydraulic pump is in transmission connection with the hydraulic motor and is communicated with the inlet of the reversing valve in a switching-on and switching-off mode, and the output pressure of the second hydraulic pump is different from that of the first hydraulic pump; the first accumulator is respectively communicated with the first hydraulic pump, the inlet of the reversing valve and the outlet of the reversing valve in a switching-on and switching-off mode; and the second accumulator is respectively communicated with the inlets of the second hydraulic pump and the reversing valve in a switching mode.
In some embodiments, the work machine further comprises: a first flow path including a first end communicating with the first hydraulic pump and a second end communicating with an inlet of the directional valve; a second flow path including a first end communicating with the first hydraulic pump and a second end communicating with an inlet of the first accumulator, and the first end of the second flow path communicating with the first end of the first flow path; a first control valve provided in the first flow path and configured to control on/off of the first flow path; and a second control valve provided in the second flow path and configured to control on/off of the second flow path.
In some embodiments, the work machine further includes a first check valve, an inlet of the first check valve being in communication with the first hydraulic pump, and an outlet of the first check valve being in communication with the first end of the first flow path and the first end of the second flow path.
In some embodiments, the work machine further comprises: a third flow path including a first end in communication with the outlet of the reversing valve and a second end in communication with the first accumulator; and a third control valve provided in the third flow path and configured to control on/off of the third flow path.
In some embodiments, the second end of the third flow path is in communication with the second flow path.
In some embodiments, the inlet of the hydraulic motor is in selective on-off communication with the outlet of the reversing valve.
In some embodiments, the inlet of the hydraulic motor is in communication with the second flow path, and a fourth control valve is disposed between the inlet of the hydraulic motor and the second flow path.
In some embodiments, the work machine further comprises: a fourth flow path including a first end communicating with the second hydraulic pump and a second end communicating with an inlet of the directional valve; a fifth flow path including a first end communicating with the second hydraulic pump and a second end communicating with an inlet of the second accumulator, and the first end of the fifth flow path communicating with the first end of the fourth flow path; a fifth control valve provided in the fourth flow path and configured to control on/off of the fourth flow path; and a sixth control valve provided in the fifth flow path and configured to control on/off of the fifth flow path.
In some embodiments, the work machine further comprises a second check valve, an inlet of the second check valve being in communication with the second hydraulic pump, and an outlet of the second check valve being in communication with the first end of the fourth flow path and the first end of the fifth flow path.
In some embodiments, the work machine comprises an excavator.
By applying the technical scheme of the invention, the first hydraulic pump, the second hydraulic pump, the first accumulator and the second accumulator are respectively communicated with the inlet of the reversing valve in a switching-on and switching-off mode, so that the movement of the hydraulic cylinder is provided with hydraulic power by one or a plurality of the first hydraulic pump, the second hydraulic pump, the first accumulator and the second accumulator, the pressure requirements of high, middle and low stages of a hydraulic system can be met, and compared with the situation that only one hydraulic pump provides hydraulic power for the hydraulic cylinder, the hydraulic power is provided for the hydraulic cylinder, and the problem of low fuel efficiency caused by large load fluctuation of an engine for driving the hydraulic pumps is favorably solved.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the related art, the drawings needed to be used in the description of the embodiments or the related art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 illustrates a structural schematic diagram of a hydraulic system of a related art excavator;
in fig. 1: 1. a first pilot valve; 2. a second pilot valve; 3. a hydraulic pump; 4. a diverter valve; 5. A one-way valve; 6. a hydraulic cylinder; 7. an accumulator 8, a control valve; 9. A pilot pump; 10. An energy release motor; 11. a hydraulic fluid tank.
Fig. 2 shows a schematic configuration of a hydraulic system of a working machine according to an embodiment of the present invention.
In fig. 2: 1. A hydraulic fluid tank; 2. a second hydraulic pump; 3. an engine; 4. a first hydraulic pump; 5. a first check valve; 6. a first control valve; 7. a fifth control valve; 8. a third control valve; 9. a seventh control valve; 10. a diverter valve; 11. a hydraulic cylinder; 12. a controller; 13. a first accumulator; 14. a second accumulator; 15. a second control valve; 16. a sixth control valve; 17. a first pressure sensor; 18. a second pressure sensor; 19. a fourth control valve; 20. a second one-way valve; 21. a hydraulic motor.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 2, the working machine of the present embodiment includes a work arm, a hydraulic cylinder 11, a directional control valve 10, a first hydraulic pump 4, a hydraulic motor 21, a second hydraulic pump 2, a first accumulator 13, and a second accumulator 14.
The hydraulic cylinder 11 comprises a rodless chamber a, a rod chamber B and a piston rod connected to the work arm. The reversing valve 10 includes an inlet, an outlet, a first working port in communication with the rodless chamber a, and a second working port in communication with the rod chamber B.
When the hydraulic fluid introduced from the inlet of the directional control valve 10 flows to the rodless chamber a, the piston rod is driven by the hydraulic fluid to extend to the outside of the cylinder body of the hydraulic cylinder 11, and the hydraulic fluid discharged from the rod chamber B of the hydraulic cylinder 11 flows to the outlet of the directional control valve 10 through the second working port. When the hydraulic fluid introduced from the inlet of the directional control valve 10 flows to the rod chamber B, the piston rod is driven by the hydraulic fluid to retract toward the inside of the cylinder body of the hydraulic cylinder 11, and the hydraulic fluid discharged from the rodless chamber a of the hydraulic cylinder 11 flows to the outlet of the directional control valve 10 through the first working port.
The first hydraulic pump 4 is in selectable on-off communication with the inlet of the directional valve 10. The hydraulic motor 21 is in communication with the first hydraulic pump 4 so as to be selectively opened and closed, and when the first hydraulic pump 4 is in communication with the hydraulic motor 21, the hydraulic motor 21 is driven to rotate by the hydraulic fluid output from the first hydraulic pump 4.
The second hydraulic pump 2 is in transmission connection with a hydraulic motor 21 and is in on-off communication with an inlet of the reversing valve 10, and the output pressure of the second hydraulic pump 2 is different from the output pressure of the first hydraulic pump 4. The second hydraulic pump 2 outputs hydraulic fluid of a pressure different from that of the first hydraulic pump 4 under the drive of the hydraulic motor 21.
The first accumulator 13 is in selective on-off communication with the first hydraulic pump 4, the inlet of the directional valve 10 and the outlet of the directional valve 10, respectively. The first accumulator 13 accumulates energy when communicating with the first hydraulic pump 4. The first accumulator 13 is selectively communicable with the outlet of the directional valve 10 to accumulate energy when the hydraulic cylinder 11 discharges hydraulic fluid. When the first accumulator 13 is communicated with the inlet of the direction valve 10, the energy accumulated by the first accumulator 13 can be used for driving the hydraulic cylinder 11 to work.
The second accumulator 14 is in selective on-off communication with the second hydraulic pump 2 and the inlet of the directional valve 10, respectively. When the second accumulator 14 communicates with the second hydraulic pump 2, the second accumulator 14 accumulates energy. When the second accumulator 14 is communicated with the inlet of the direction valve 10, the energy accumulated by the second accumulator 14 can be used for driving the hydraulic cylinder 11 to work.
In the embodiment, the first hydraulic pump 4, the second hydraulic pump 2, the first accumulator 13 and the second accumulator 14 are respectively in on-off communication with the inlet of the reversing valve 10, so that a single or a combination of a plurality of the first hydraulic pump 4, the second hydraulic pump 2, the first accumulator 13 and the second accumulator 14 provides hydraulic power for the movement of the hydraulic cylinder 11, the pressure requirements of each stage of high, middle and low of the hydraulic system can be met, and compared with the situation that only one hydraulic pump provides hydraulic power for the hydraulic cylinder, the problem of low fuel efficiency caused by large load fluctuation of an engine 3 for driving the hydraulic pumps is favorably avoided.
The work machine further comprises a first flow path, a second flow path, a first control valve 6 and a second control valve 15. The first flow path includes a first end communicating with the first hydraulic pump 4 and a second end communicating with an inlet of the directional valve 10. The second flow path includes a first end communicating with the first hydraulic pump 4 and a second end communicating with an inlet of the first accumulator 13, and the first end of the second flow path communicates with the first end of the first flow path.
The first control valve 6 is provided in the first flow path and configured to control opening and closing of the first flow path. And a second control valve 15 provided in the second flow path and configured to control on/off of the second flow path.
When only the first control valve 6 of the first control valve 6 and the second control valve 15 is conducted, the hydraulic fluid output from the first hydraulic pump 4 may enter the inlet of the direction valve 10, thereby driving the hydraulic cylinder 11 to operate.
When only the second control valve 15 of the first control valve 6 and the second control valve 15 is opened, the hydraulic fluid discharged from the first hydraulic pump 4 is delivered to the first accumulator 13, and the first accumulator 13 accumulates energy.
When both the first control valve 6 and the second control valve 15 are on, the first accumulator 13 communicates with the inlet of the direction valve 10, and the energy accumulated in the first accumulator 13 drives the hydraulic cylinder 11 to operate.
The working machine further comprises a first check valve 5, an inlet of the first check valve 5 is communicated with the first hydraulic pump 4, and an outlet of the first check valve 5 is communicated with a first end of the first flow path and a first end of the second flow path.
The working machine further comprises a third flow path and a third control valve 8. The third flow path includes a first end communicating with the outlet of the direction valve 10 and a second end communicating with the first accumulator 13; the third control valve 8 is provided in the third flow path and configured to control on/off of the third flow path.
A second end of the third flow path communicates with the second flow path to enable communication of the first accumulator 13 with the outlet of the directional valve 10. The third flow path and the second flow path communicate between the second control valve 15 and the outlet of the first hydraulic pump 4.
When both the third control valve 8 and the second control valve 15 are turned on, the hydraulic fluid discharged from the hydraulic cylinder 11 enters the first accumulator 13 through the outlet of the selector valve 10, the third flow path, and the second flow path to accumulate energy in the first accumulator 13.
An inlet of the hydraulic motor 21 communicates with the second flow path, and a fourth control valve 19 is provided between the inlet of the hydraulic motor 21 and the second flow path. The hydraulic motor 21 and the second flow path communicate between the second control valve 15 and the outlet of the first hydraulic pump 4.
When the fourth control valve 19 is turned on, the hydraulic fluid output from the first hydraulic pump 4 drives the hydraulic motor 21 to rotate, and the hydraulic motor 21 drives the second hydraulic pump 2 to rotate, so that the second hydraulic pump 2 outputs the hydraulic fluid. In some embodiments, the pressure of the hydraulic fluid output by the second hydraulic pump 2 is greater than the pressure of the hydraulic fluid output by the first hydraulic pump 4.
The inlet of the hydraulic motor 21 is in selective on-off communication with the outlet of the directional valve 10. When both the third control valve 8 and the fourth control valve 19 are open, hydraulic fluid discharged from the hydraulic cylinder 11 drives the hydraulic motor 21 to rotate.
The work machine further comprises a fourth flow path, a fifth control valve and a sixth control valve 16. The fourth flow path includes a first end communicating with the second hydraulic pump 2 and a second end communicating with an inlet of the selector valve 10. The fifth flow path includes a first end communicating with the second hydraulic pump 2 and a second end communicating with an inlet of the second accumulator 14, and the first end of the fifth flow path communicates with the first end of the fourth flow path.
The fifth control valve 7 is provided in the fourth flow path and configured to control on/off of the fourth flow path. The sixth control valve 16 is provided in the fifth flow path and configured to control on/off of the fifth flow path.
When only the fifth control valve 7 of the fifth control valve 7 and the sixth control valve 16 is conducted, the hydraulic fluid output from the second hydraulic pump 2 may enter the inlet of the direction valve 10, thereby driving the hydraulic cylinder 11 to operate.
When only the sixth control valve 16 of the fifth and sixth control valves 7 and 16 is open, the hydraulic fluid discharged from the second hydraulic pump 2 is delivered to the second accumulator 14, and the second accumulator 14 accumulates energy.
When the fifth control valve 7 and the sixth control valve 16 are both open, the second accumulator 14 communicates with the inlet of the direction switching valve 10, and the energy accumulated in the first accumulator 13 drives the hydraulic cylinder 11 to operate.
The working machine further comprises a second check valve 20, an inlet of the second check valve 20 is communicated with the second hydraulic pump 2, and an outlet of the second check valve 20 is communicated with a first end of the fourth flow path and a first end of the fifth flow path.
The working machine further comprises a seventh control valve 9 arranged between the outlet of the reversing valve 10 and the hydraulic fluid tank 1.
The working machine further comprises a controller 12 and a first pressure sensor 17 for detecting the charging pressure of the first accumulator 13, the controller 12 being in signal connection with the first pressure sensor 17 and the second control valve 15, respectively, for closing the second control valve 15 after the pressure in the first accumulator 13 has reached a first predetermined pressure.
The working machine further comprises a controller 12 and a second pressure sensor 18 for detecting the charging pressure of the second accumulator 14, the controller 12 being in signal connection with the second pressure sensor 18 and the sixth control valve 16, respectively, for closing the sixth control valve 16 after the pressure in the second accumulator 14 has reached a second predetermined pressure.
In the present exemplary embodiment, the charging pressure of the second energy store 14 is greater than the charging pressure of the first energy store 13.
The controller 12 is in signal connection with the first to seventh control valves respectively, and the controller 12 realizes the above functions of the hydraulic system by controlling the on-off of the first to seventh control valves.
In some embodiments, the work machine comprises an excavator.
The working principle of the hydraulic system is described below based on some exemplary working processes of the working machine.
After the excavator is started, the controller 12 outputs electrical signals to the fourth control valve 19 and the sixth control valve 16. After the fourth control valve 19 is electrified, the right side works; after the sixth control valve 16 is powered on, the right position works, the engine 3 drives the first hydraulic pump 4 to rotate, oil is absorbed from the hydraulic fluid tank 1, medium-pressure oil is output by the first hydraulic pump 4, passes through the first one-way valve 5 and then passes through the fourth control valve 19 to drive the hydraulic motor 21 to rotate, the hydraulic motor 21 rotates to drive the second hydraulic pump 2 to rotate, high-pressure oil is output by the second hydraulic pump 2, and enters the second energy accumulator 14 after passing through the right position of the sixth control valve 16, and the high-pressure oil is stored after the initial power-on in the process, so that power is provided for a high-pressure load in the working process of the excavator.
During the raising of the boom of the excavator, the controller 12 outputs an electric signal to the second control valve 15. And the second control valve 15 works at the right position after being electrified, and the oil way is communicated. The controller 12 outputs an electric signal to the seventh control valve 9, the seventh control valve 9 after being electrified works at the left position, and the oil circuit is communicated. The controller 12 outputs an electric signal to the first control valve 6, the first control valve 6 works at the left position after being powered on, an oil path is communicated, the controller 12 outputs an electric signal to the right side of the electromagnetic valve reversing valve 10, the electromagnetic valve reversing valve 10 works at the right position after being powered on, the oil path is communicated, the first hydraulic pump 4 outputs pressure oil, the pressure oil passes through the first one-way valve 5, passes through the first control valve 6, passes through the electromagnetic valve reversing valve 10 at the right position oil path and enters the rodless cavity A of the hydraulic cylinder 11, under the condition that the load of a movable arm is small, the hydraulic oil in the first energy accumulator 13 can also pass through the second control valve 15, passes through the first control valve 6, passes through the electromagnetic valve reversing valve 10 at the right position oil path and enters the rodless cavity A of the hydraulic cylinder 11, and the hydraulic oil in the rodless cavity B of the hydraulic cylinder 11 passes through the electromagnetic valve 10 at the right position oil path and then passes through the seventh control valve 9 and returns to the hydraulic fluid tank 1.
If the boom load is large, the controller 12 outputs an electric signal to the sixth control valve 16, and the sixth control valve 16 after being powered works at the right position, so that the oil path is connected. The controller 12 outputs an electric signal to the fifth control valve 7, the fifth control valve 7 works at the left position after being electrified, and the oil circuit is communicated. The controller 12 outputs an electric signal to the right side of the electromagnetic valve reversing valve 10, after the electric signal is obtained, the electromagnetic valve reversing valve 10 works at the right position, and an oil path is communicated. The hydraulic oil in the second accumulator 14 can also pass through the sixth control valve 16, the fifth control valve 7 and the right oil path of the electromagnetic valve reversing valve 10, and enter the rodless cavity a of the hydraulic cylinder 11 to drive the movable arm to ascend.
During the lowering of the boom of the excavator, the controller 12 outputs an electric signal to the first control valve 6. The first control valve 6 works at the left position after being electrified, and the oil way is communicated. The controller 12 outputs an electric signal to the third control valve 8, the third control valve 8 works at the left position after the electric signal is obtained, and the oil circuit is communicated. The controller 12 outputs an electric signal to the second control valve 15, the second control valve 15 works at the right position after the electric signal is obtained, and the oil circuit is connected. The controller 12 outputs an electric signal to the left side of the electromagnetic valve reversing valve 10, after the electric signal is obtained, the electromagnetic valve reversing valve 10 works in the left position, and an oil path is communicated. The first hydraulic pump 4 outputs pressure oil, passes through the first check valve 5, the first control valve 6 and the right oil way of the electromagnetic valve reversing valve 10, and enters the rodless cavity B of the hydraulic cylinder 11. Hydraulic oil in a rodless cavity A of the hydraulic cylinder 11 passes through a solenoid valve reversing valve 10 at the left position, passes through a third control valve 8 at the left position, passes through a second control valve 15 at the right position, and enters a first energy accumulator 13 to finish energy recovery.
During the working process of the excavator, the output pressure oil of the first hydraulic pump 4 or the output pressure oil of the first energy accumulator 13 or the output pressure oil of the second energy accumulator 14 is determined according to the load condition of each executing element, so that the pressure requirements of the hydraulic system of the excavator in high, medium and low stages are met. The excavator engine 3 is ensured to be in middle and low load operation.
The present invention is not limited to the above exemplary embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A work machine, comprising:
a working arm;
the hydraulic cylinder (11) comprises a rodless cavity (A), a rod cavity (B) and a piston rod connected with the working arm;
a reversing valve (10) comprising an inlet, an outlet, a first working port in communication with said rodless chamber (a), and a second working port in communication with said rod chamber (B);
a first hydraulic pump (4) in selective on-off communication with an inlet of the directional valve (10);
a hydraulic motor (21) in on-off communication with the first hydraulic pump (4) selectively;
the second hydraulic pump (2) is in transmission connection with the hydraulic motor (21) and is in on-off communication with an inlet of the reversing valve (10) selectively, and the output pressure of the second hydraulic pump (2) is different from that of the first hydraulic pump (4);
a first accumulator (13) which is in selective on-off communication with the first hydraulic pump (4), the inlet of the reversing valve (10) and the outlet of the reversing valve (10); and
and the second accumulator (14) is respectively communicated with the inlets of the second hydraulic pump (2) and the reversing valve (10) in a switching mode.
2. The work machine of claim 1, further comprising:
a first flow path comprising a first end communicating with the first hydraulic pump (4) and a second end communicating with an inlet of the directional valve (10);
a second flow path including a first end communicating with the first hydraulic pump (4) and a second end communicating with an inlet of the first accumulator (13), and the first end of the second flow path communicating with the first end of the first flow path;
a first control valve (6) provided in the first flow path and configured to control on/off of the first flow path; and
and a second control valve (15) provided in the second flow path and configured to control on/off of the second flow path.
3. A working machine according to claim 2, further comprising a first non-return valve (5), an inlet of the first non-return valve (5) being in communication with the first hydraulic pump (4), and an outlet of the first non-return valve (5) being in communication with a first end of the first flow path and a first end of the second flow path.
4. The work machine of claim 2, further comprising:
a third flow path comprising a first end in communication with an outlet of the reversing valve (10) and a second end in communication with the first accumulator (13);
and a third control valve (8) provided in the third flow path and configured to control on/off of the third flow path.
5. The work machine of claim 4, wherein a second end of the third flow path is in communication with the second flow path.
6. A working machine according to any of claims 2-5, characterized in that the inlet of the hydraulic motor (21) is in selectable on-off communication with the outlet of the directional valve (10).
7. A working machine according to any of claim 6, characterized in that the inlet of the hydraulic motor (21) communicates with the second flow path, and that a fourth control valve (19) is arranged between the inlet of the hydraulic motor (21) and the second flow path.
8. The work machine of claim 1, further comprising:
a fourth flow path including a first end communicating with the second hydraulic pump (2) and a second end communicating with an inlet of the direction valve (10);
a fifth flow path including a first end communicating with the second hydraulic pump (2) and a second end communicating with an inlet of the second accumulator (14), and the first end of the fifth flow path communicating with the first end of the fourth flow path;
a fifth control valve (7) provided in the fourth flow path and configured to control on/off of the fourth flow path; and
and a sixth control valve (16) provided in the fifth flow path and configured to control on/off of the fifth flow path.
9. The working machine according to claim 8, further comprising a second check valve (20), an inlet of the second check valve (20) being in communication with the second hydraulic pump (2), and an outlet of the second check valve (20) being in communication with a first end of the fourth flow path and a first end of the fifth flow path.
10. A working machine according to claim 1, characterized by comprising an excavator.
CN202111132345.9A 2021-09-27 2021-09-27 Construction machine Active CN113586532B (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070074509A1 (en) * 2005-09-30 2007-04-05 Caterpillar Inc. Hydraulic system for recovering potential energy
CN102758813A (en) * 2012-08-01 2012-10-31 三一重工股份有限公司 Energy-recovery hydraulic system and engineering machinery
CN106223380A (en) * 2016-08-31 2016-12-14 徐州徐工挖掘机械有限公司 A kind of hydraulic hybrid excavator system
CN107882802A (en) * 2017-09-22 2018-04-06 北京机械设备研究所 A kind of three-level Erecting System
CN111271327A (en) * 2020-01-23 2020-06-12 福建工程学院 Independent composite control hydraulic system
CN112384662A (en) * 2018-08-30 2021-02-19 沃尔沃建筑设备公司 Hydraulic circuit for construction equipment

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070074509A1 (en) * 2005-09-30 2007-04-05 Caterpillar Inc. Hydraulic system for recovering potential energy
CN102758813A (en) * 2012-08-01 2012-10-31 三一重工股份有限公司 Energy-recovery hydraulic system and engineering machinery
CN106223380A (en) * 2016-08-31 2016-12-14 徐州徐工挖掘机械有限公司 A kind of hydraulic hybrid excavator system
CN107882802A (en) * 2017-09-22 2018-04-06 北京机械设备研究所 A kind of three-level Erecting System
CN112384662A (en) * 2018-08-30 2021-02-19 沃尔沃建筑设备公司 Hydraulic circuit for construction equipment
CN111271327A (en) * 2020-01-23 2020-06-12 福建工程学院 Independent composite control hydraulic system

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