CN112343871B - Auxiliary lifting hydraulic system and engineering machinery - Google Patents
Auxiliary lifting hydraulic system and engineering machinery Download PDFInfo
- Publication number
- CN112343871B CN112343871B CN202011275611.9A CN202011275611A CN112343871B CN 112343871 B CN112343871 B CN 112343871B CN 202011275611 A CN202011275611 A CN 202011275611A CN 112343871 B CN112343871 B CN 112343871B
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- oil
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- auxiliary lifting
- movable arm
- hydraulic system
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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
- F15B1/024—Installations or systems with accumulators used as a supplementary power source, e.g. to store energy in idle periods to balance pump load
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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
-
- 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
- E02F9/2285—Pilot-operated systems
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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
- F15B1/027—Installations or systems with accumulators having accumulator charging devices
- F15B1/033—Installations or systems with accumulators having accumulator charging devices with electrical control means
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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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/14—Energy-recuperation means
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/88—Control measures for saving energy
Abstract
The invention relates to a hydraulic system, which aims at solving the problem of recycling potential energy of an upper movable arm of engineering machinery; the auxiliary lifting hydraulic system comprises a liquid filling pressure oil source, an auxiliary lifting oil cylinder, an energy accumulator, a switching valve, a hydraulic oil tank and an overflow valve, wherein the liquid filling pressure oil source is connected with the auxiliary lifting oil cylinder and the energy accumulator through the switching valve at the same time, and the overflow valve is connected between the energy accumulator and the hydraulic oil tank. The auxiliary lifting hydraulic system can be used for auxiliary lifting, when the movable arm descends, the auxiliary lifting oil cylinder presses oil in the oil cavity of the auxiliary lifting oil cylinder into the energy accumulator under the action of the movable arm, so that the gravity potential energy of the movable arm is recovered, when the movable arm ascends again, the oil in the energy accumulator enters the oil cavity of the auxiliary lifting oil cylinder, and the auxiliary lifting oil cylinder and the movable arm lifting hydraulic system lift the movable arm together, so that the recovered energy is reused when the movable arm descends.
Description
Technical Field
The present disclosure relates to hydraulic systems, and more particularly, to an auxiliary lifting hydraulic system and an engineering machine.
Background
The excavator is a machine with very many applications and good operation precision, and is widely used in various engineering construction projects, however, a huge mechanical structure consumes much energy in the working process. In an excavator, the mass of a boom, an arm, a bucket, and the like is huge, and a great amount of energy is consumed for lifting the boom during operation, and huge potential energy is consumed when the boom is lowered.
With the improvement of the requirements of laws and regulations such as energy conservation, consumption reduction, emission and the like, the defect that the energy consumption of the excavator driven by the traditional diesel engine is too high is more and more remarkable. The energy consumption problem is always one of important performance indexes focused by customers, and the reduction of oil consumption directly reduces the use cost of customers. Therefore, how to reduce the energy consumption of the excavator is an urgent problem for the current excavator manufacturing industry.
In an excavator, the energy consumed by lifting and lowering the movable arm occupies most of the total energy consumption of the excavator, so how to recycle and utilize the potential energy in the process of lowering the movable arm after lifting the movable arm becomes the key point of energy conservation and emission reduction in the current industry.
Disclosure of Invention
The invention aims at solving the technical problem of recycling potential energy when a movable arm of engineering machinery descends, and provides an auxiliary lifting hydraulic system and engineering machinery so as to recycle and utilize the potential energy when the movable arm of engineering machinery descends.
The technical scheme for achieving the purpose of the invention is as follows: the auxiliary lifting hydraulic system is characterized by comprising a liquid filling pressure oil source, an auxiliary lifting oil cylinder, an energy accumulator, a switching valve, a hydraulic oil tank and an overflow valve, wherein the liquid filling pressure oil source is simultaneously connected with the auxiliary lifting oil cylinder and the energy accumulator through the switching valve, and the overflow valve is connected between the energy accumulator and the hydraulic oil tank. The auxiliary lifting hydraulic system can be used for auxiliary lifting, and when the movable arm of the engineering machinery descends, the auxiliary lifting oil cylinder presses oil in an oil cavity of the auxiliary lifting oil cylinder into the energy accumulator under the action of the movable arm, so that the gravitational potential energy recovery of the movable arm is realized. When the movable arm is lifted again, oil in the energy accumulator enters an oil cavity of the auxiliary lifting oil cylinder, and the auxiliary lifting oil cylinder lifts the movable arm together with a lifting hydraulic system of the movable arm, so that the energy recovered when the movable arm descends can be reused.
The auxiliary lifting hydraulic system further comprises a one-way valve, wherein the oil inlet end of the one-way valve is connected with the oil outlet end of the switch valve, the oil outlet end of the one-way valve is simultaneously connected with the auxiliary lifting cylinder and the energy accumulator, and the switch valve is simultaneously communicated with the auxiliary lifting cylinder and the energy accumulator through the one-way valve.
The auxiliary lifting hydraulic system further comprises an unloading valve, wherein the unloading valve is connected between the one-way valve and the switch valve, and the oil return end of the unloading valve is connected with the hydraulic oil tank.
In the auxiliary lifting hydraulic system, the auxiliary lifting hydraulic system further comprises an oil drain switch valve, and the oil drain switch valve is connected between the energy accumulator and the hydraulic oil tank.
The technical scheme for achieving the purpose of the invention is as follows: the engineering machinery comprises a movable arm hinged on a main machine of the engineering machinery and a movable arm lifting hydraulic system for lifting the movable arm, wherein a movable arm oil cylinder of the movable arm lifting hydraulic system is connected between the movable arm and the main machine; the hydraulic system is characterized by further comprising the auxiliary lifting hydraulic system, wherein the auxiliary lifting oil cylinder and the movable arm oil cylinder are connected between the movable arm and the host in parallel. The auxiliary lifting oil cylinder is used for assisting the movable arm oil cylinder to lift the movable arm by using the pressure oil stored in the energy accumulator when the movable arm is lifted, and the gravitational potential energy of the movable arm is converted into hydraulic energy through the auxiliary lifting oil cylinder and stored in the energy accumulator when the movable arm is lowered, so that the recovery and the utilization of the potential energy of the movable arm are realized, and the energy consumption of the whole machine is reduced.
The engineering machinery further comprises a controller and a liquid filling control electromagnetic valve, wherein the electromagnetic coil is connected with the controller, a first oil port of the liquid filling control electromagnetic valve is connected with a liquid control end of the switch valve, a second oil port of the liquid filling control electromagnetic valve is connected with the hydraulic oil tank, a third oil port of the liquid filling control electromagnetic valve is connected with a pilot oil source, and the first oil port is selectively communicated with the second oil port or the third oil port.
The engineering machinery further comprises a pressure sensor and an attitude sensor.
The pressure sensor is connected with the controller and is used for detecting the actual pressure value of the energy accumulator.
The gesture sensor is connected with the controller and is used for detecting the extension displacement of the auxiliary lifting oil cylinder or detecting the rotation angle of the auxiliary lifting oil cylinder; the attitude sensor may be a displacement sensor that detects the extension displacement of the auxiliary lift cylinder, or may be an angle sensor that detects the rotation angle of the auxiliary lift cylinder.
The controller determines a pressure value of the target charging pressure of the accumulator in the current posture according to a detection result of the posture sensor, when the actual pressure value of the accumulator is smaller than or equal to the pressure value of the target charging pressure of the accumulator in the current posture, the controller controls the charging control electromagnetic valve to enable the switch valve to be in a conducting state, and when the actual pressure value of the accumulator is larger than the pressure value of the target charging pressure of the accumulator in the current posture, the controller controls the charging control electromagnetic valve to enable the switch valve to be in a cut-off state.
The engineering machinery further comprises an oil drain switch valve, and the oil drain switch valve is connected between the energy accumulator and the hydraulic oil tank. Further, the oil drain switch valve is an electromagnetic valve with an electromagnetic coil connected with the controller.
In the engineering machinery, the liquid filling pressure oil source in the auxiliary lifting hydraulic system is a hydraulic pump of the movable arm lifting hydraulic system.
Compared with the prior art, the invention recovers and recycles the gravitational potential energy reduced when the movable arm descends, reduces the energy consumption of the machine, and has simple and reliable structure and obvious energy-saving effect of the auxiliary lifting hydraulic system.
Drawings
Fig. 1 is a schematic diagram of an auxiliary lifting hydraulic system of the present invention.
Fig. 2 is a schematic structural diagram of a boom cylinder lifting arm of an auxiliary lifting cylinder in an engineering machine.
Part names and serial numbers in the figure:
the hydraulic oil tank 1, the main pump 2, the switching valve 3, the unloading valve 4, the oil drain switching valve 5, the overflow valve 6, the one-way valve 7, the accumulator 8, the pilot oil supply valve 9, the liquid filling control electromagnetic valve 10, the controller 11, the auxiliary lifting oil cylinder 12, the movable arm 13, the movable arm oil cylinder 14 and the rotary platform 15.
Detailed Description
The following describes specific embodiments with reference to the drawings.
Fig. 1 shows an auxiliary lifting hydraulic system in an excavator in this embodiment. The auxiliary lifting hydraulic system may also be used in other work machines, such as loaders.
In an excavator, a lower body and an upper body rotatably mounted on the lower body constitute an excavator main body, a boom is hinged to a rotary platform of the upper body, an arm is usually hinged to a tip end of the boom, and a bucket or other accessory is correspondingly mounted to a tip end of the arm according to the function of the excavator.
The main hydraulic systems of the excavator include rotary motors, traveling motors, boom, stick, bucket, or other implement-driven hydraulic systems having a common hydraulic pump, hydraulic tank, and the like. The boom lifting hydraulic system for lifting the boom comprises a boom cylinder 14, a main control valve for controlling the hydraulic cylinder and a pilot control oil path for controlling the main control valve. One end of the boom cylinder 14 is hinged to the boom 13, and the other end is hinged to a revolving platform 15 of the excavator, as shown in fig. 2. The extension and retraction of the boom cylinder 14 realizes the lifting and lowering of the boom 13.
As shown in fig. 1, the auxiliary lift hydraulic system includes a charging pressure oil source, an auxiliary lift cylinder 12, an accumulator 8, a switching valve 3, an overflow valve 6, a hydraulic tank 1, a check valve 7, an unloading valve 4, a drain switching valve 5, and the like. Wherein the charging pressure oil source and the hydraulic oil tank 1 are common components with the boom lifting hydraulic system. For example, the hydraulic charging pressure oil source may be a main pump 2 of the excavator, which supplies oil to the main hydraulic system of the excavator when the main pump is in operation, and also supplies oil to the auxiliary lifting hydraulic system when the accumulator of the auxiliary lifting hydraulic system is charged.
The switch valve 3 is a hydraulic control valve, the oil inlet end of the switch valve 3 is connected with a liquid filling pressure oil source, namely, the switch valve is connected with the main pump 2 of the excavator, the oil outlet end of the switch valve 3 is connected with the oil inlet end of the unloading valve 4, the oil outlet end of the unloading valve 4 is connected with the oil inlet end of the one-way valve 7, the oil return end of the unloading valve 4 is connected with the hydraulic oil tank 1, and unloading is carried out through the unloading valve 4 when the accumulator 8 is filled completely and the switch valve 3 is not closed yet.
The oil outlet end of the one-way valve 7 is connected with the accumulator 8 and the large cavity of the auxiliary lifting oil cylinder 12, and the small cavity of the auxiliary lifting oil cylinder 12 is connected with the hydraulic oil tank 1.
The relief valve 6 serves as a relief valve and is connected between the accumulator 8 and the hydraulic tank 1.
The oil drain switch valve 5 is arranged between the energy accumulator 8 and the hydraulic oil tank 1, and when the excavator does not work, the oil drain switch valve 5 is conducted to release the pressure oil stored in the energy accumulator 8, so that accidents are avoided.
In the auxiliary lifting hydraulic system, the number of the auxiliary lifting cylinders can be one or two, and the two auxiliary lifting cylinders are arranged in parallel.
In order to realize automatic filling and discharging of the accumulator 8, the excavator in this embodiment further includes a controller 11 (i.e. a logic control unit) and a filling control electromagnetic valve 10, wherein a first oil port of the filling control electromagnetic valve 10 is connected with a hydraulic control end of the switch valve 3, a second oil port is connected with the hydraulic oil tank 1, a third oil port is connected with a pilot oil source, and the first oil port is selectively communicated with the second oil port or the third oil port. The pilot oil source is a pilot oil source valve 9 in the main hydraulic system of the excavator, or may be a pilot pump in the excavator. The electromagnetic coil of the liquid filling control electromagnetic valve 10 is connected with the controller 11, when the electromagnetic coil of the liquid filling control electromagnetic valve 10 is powered on, the pressure oil output by the pilot oil source valve 9 acts on the liquid control end of the switch valve 3 through the third oil port and the first oil port of the liquid filling control electromagnetic valve, the switch valve 3 commutates to conduct between the oil inlet end and the oil outlet end, and the oil output by the main pump 2 flows to the large cavities of the accumulator 8 and the auxiliary lifting oil cylinder 12 through the switch valve 3, the unloading valve 4 and the one-way valve 7. When the oil filling is stopped, the electromagnetic coil of the liquid filling control electromagnetic valve 10 is powered off, and the first oil port and the second oil port of the liquid filling control electromagnetic valve 10 are communicated with the hydraulic control end of the switching valve 3 to release pressure, so that the switching valve 3 is switched to be closed.
The oil drain switch valve 5 is an electromagnetic valve, an electromagnetic coil of which is connected with the controller 11, and the controller 11 controls the on or off of the oil drain switch valve.
For detecting the pressure of the oil in the accumulator 8, a pressure sensor (not shown) is provided, which is connected to the signal input S1 of the controller 11, for detecting the pressure value of the oil in the accumulator.
In order to acquire the posture of the auxiliary lift cylinder 12, a posture sensor (not shown) is provided, which is connected to the signal input terminal S2 of the controller 11, and the posture sensor may be a displacement sensor that detects the extension displacement of the auxiliary lift cylinder or an angle sensor that detects the rotation angle of the auxiliary lift cylinder.
The auxiliary lifting hydraulic system assists the movable arm lifting hydraulic system to lift and lower the movable arm, so that potential energy of the movable arm is recycled and utilized when the movable arm is lowered, the pressure in the auxiliary lifting oil cylinder (namely, the actual pressure of the energy accumulator) needs to be set to a reasonable value according to design parameters of the excavator, if the pressure in the auxiliary lifting oil cylinder 12 is too high, the bucket of the excavator is unloaded and the movable arm is lowered, the lowering speed of the movable arm is likely to be greatly reduced or even cannot be lowered due to the effect of the auxiliary lifting oil cylinder, and the potential energy recycling effect of the movable arm cannot be achieved, but the working efficiency of the excavator is lowered. If the pressure in the energy accumulator is too low, the energy accumulator absorbs too little potential energy of the movable arm in the moving arm descending process, and the effect of recycling the gravitational potential energy of the movable arm descending is poor. Therefore, in order to achieve the best effect, the charging pressure in the accumulator after the auxiliary lifting hydraulic system is charged should reach a reasonable value, namely the target charging pressure.
Under the conditions that the switch valve is closed 3, the overflow valve 6 does not overflow, and the oil drain switch valve 5 does not drain, the energy accumulator 8, the auxiliary lifting oil cylinder 12 and a connecting pipeline thereof form a closed system, the internal pressure of the closed system changes along with the posture change of the auxiliary lifting oil cylinder 12, and the posture of the auxiliary lifting oil cylinder 12 refers to the telescopic displacement of the auxiliary lifting oil cylinder or the included angle between the auxiliary lifting oil cylinder 12 and a rotary platform. The telescopic displacement of the auxiliary lifting cylinder 12 and the included angle between the auxiliary lifting cylinder and the rotary platform are in one-to-one correspondence. When the auxiliary lifting cylinder 12 stretches, the volume of a large cavity of the auxiliary lifting cylinder changes, and the pressure in the accumulator 8 also changes. Therefore, the pressure value for the target charge pressure determined according to the excavator design parameters also appears to be a different pressure value depending on the posture of the auxiliary lift cylinder.
When automatic charging is performed, the controller 11 determines a pressure value of the target charging pressure in the posture according to a detection result of the posture sensor (the telescopic displacement of the auxiliary lifting cylinder or the angle between the auxiliary lifting cylinder and the rotary platform), and when the pressure value of the target charging pressure is larger than or equal to an actual pressure value of the accumulator 8 at the moment, the controller 11 enables the charging control electromagnetic valve 10 to be electrified, and the switching valve 3 is conducted to charge the accumulator 8; if the pressure value of the target charge pressure is smaller than the actual pressure value of the accumulator 8, the controller 11 controls the charge control solenoid valve 10 to close the on-off valve 3, thereby stopping charging the accumulator 8.
The working process of the excavator in this embodiment is as follows: after the engine of the excavator is started, the controller 11 detects the gesture of the auxiliary lifting oil cylinder 12 and the actual pressure value in the accumulator 8, the pressure value of the target charging pressure of the accumulator 8 in the gesture is determined through the gesture of the auxiliary lifting oil cylinder 11, and when the actual pressure value of the accumulator 8 is smaller than or equal to the pressure value of the target charging pressure in the gesture, the controller 11 controls the charging control electromagnetic valve 10, so that the switch valve 3 is conducted to charge the accumulator 8. When the actual pressure value of the accumulator 8 is larger than the pressure value of the target charging pressure in the gesture, the charging control electromagnetic valve 10 is powered off, the switch valve 3 is closed, and charging of the accumulator 8 is finished.
When the excavator works to lift the movable arm, the large cavity of the movable arm oil cylinder in the movable arm lifting hydraulic system is filled with oil, and the movable arm oil cylinder stretches to lift the movable arm. When lifting, the oil in the accumulator 8 enters the large cavity of the auxiliary lifting oil cylinder 12, the auxiliary lifting oil cylinder 12 stretches, and the movable arm is lifted together with the movable arm oil cylinder, so that the lifting of the movable arm is assisted. When the movable arm descends, large-cavity oil of the movable arm oil cylinder returns to the hydraulic oil tank, the movable arm descends under the action of gravity, the gravity of the movable arm acts on the auxiliary lifting oil cylinder 12 to retract a piston rod of the auxiliary lifting oil cylinder 12, oil in the large cavity of the auxiliary lifting oil cylinder 12 enters an accumulator, the oil pressure in the accumulator 8 rises, and the accumulator 8 absorbs the reduced gravitational potential energy in the descending process of the movable arm and stores the gravitational potential energy in the accumulator in the form of hydraulic energy so as to be used in the next lifting of the movable arm. In the embodiment, potential energy of the movable arm is recycled and utilized through the energy accumulator and the auxiliary lifting oil cylinder, so that energy conservation and consumption reduction of the excavator are realized.
When the engine is stopped, the oil drain switch valve 5 is powered off, the oil drain switch valve 5 is conducted, oil in the energy accumulator 8 flows into the hydraulic oil tank 1 through the oil drain switch valve, pressure relief of the energy accumulator 8 is achieved, and high-pressure oil is prevented from being dangerous when an auxiliary lifting hydraulic system is maintained.
The auxiliary lifting hydraulic system in this embodiment may also be used for a loader in which the boom is lifted by extension and contraction of the boom cylinder, and both ends of the boom are respectively hinged between the boom and the front frame. An auxiliary lifting oil cylinder in the auxiliary lifting hydraulic system is connected between the movable arm and the front frame and is arranged in parallel with the movable arm oil cylinder. The working principle of the auxiliary lifting hydraulic system in the loader is the same as that of the auxiliary lifting hydraulic system in the excavator.
Claims (6)
1. The engineering machinery comprises a movable arm hinged on a main machine of the engineering machinery and a movable arm lifting hydraulic system for lifting the movable arm, wherein a movable arm oil cylinder of the movable arm lifting hydraulic system is connected between the movable arm and the main machine;
the hydraulic system is characterized by further comprising an auxiliary lifting hydraulic system, wherein the auxiliary lifting hydraulic system comprises a liquid filling pressure oil source, an auxiliary lifting oil cylinder, an energy accumulator, a switching valve, a hydraulic oil tank, an overflow valve, a controller, a liquid filling control electromagnetic valve connected with the electromagnetic coil, a pressure sensor and an attitude sensor connected with the controller, the liquid filling pressure oil source is simultaneously connected with a large cavity of the auxiliary lifting oil cylinder and the energy accumulator through the switching valve, and the overflow valve is connected between the energy accumulator and the hydraulic oil tank;
the auxiliary lifting oil cylinder and the movable arm oil cylinder are connected between the movable arm and the host in parallel;
the first oil port of the liquid filling control electromagnetic valve is connected with the hydraulic control end of the switch valve, the second oil port is connected with the hydraulic oil tank, the third oil port is connected with a pilot oil source, and the first oil port is selectively communicated with one of the second oil port and the third oil port;
the pressure sensor is used for detecting the actual pressure value of the energy accumulator;
the gesture sensor is used for detecting the extending displacement of the auxiliary lifting oil cylinder or detecting the rotation angle of the auxiliary lifting oil cylinder;
the controller determines a pressure value of the target charging pressure of the accumulator under the current gesture of the auxiliary lifting oil cylinder according to a detection result of the gesture sensor, and when the actual pressure value of the accumulator is smaller than or equal to the pressure value of the target charging pressure of the accumulator under the current gesture, the controller controls the charging control electromagnetic valve to enable the switch valve to be in a conducting state, otherwise, the controller controls the charging control electromagnetic valve to enable the switch valve to be in a cut-off state.
2. The construction machine according to claim 1, wherein the auxiliary lifting hydraulic system further comprises a one-way valve, an oil inlet end of the one-way valve is connected with an oil outlet end of the on-off valve, and the oil outlet end of the one-way valve is connected with the auxiliary lifting cylinder and the accumulator at the same time.
3. The construction machine according to claim 2, wherein the auxiliary lifting hydraulic system further comprises an unloading valve connected between the check valve and the on-off valve, and an oil return end of the unloading valve is connected with the hydraulic tank.
4. The work machine of claim 1, wherein the auxiliary lift hydraulic system further comprises a drain switch valve connected between the accumulator and the hydraulic tank.
5. The construction machine according to claim 4, wherein the oil drain switching valve is a solenoid valve having a solenoid connected to a controller.
6. The work machine of claim 1, wherein the source of hydraulic fluid in the auxiliary hoist hydraulic system is a hydraulic pump in the boom hoist hydraulic system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011275611.9A CN112343871B (en) | 2020-11-16 | 2020-11-16 | Auxiliary lifting hydraulic system and engineering machinery |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011275611.9A CN112343871B (en) | 2020-11-16 | 2020-11-16 | Auxiliary lifting hydraulic system and engineering machinery |
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| CN112343871A CN112343871A (en) | 2021-02-09 |
| CN112343871B true CN112343871B (en) | 2023-05-09 |
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| JP3929380B2 (en) * | 2002-09-26 | 2007-06-13 | 株式会社小松製作所 | Position energy recovery / regeneration device for work equipment |
| CN203476851U (en) * | 2013-09-04 | 2014-03-12 | 山东宏康机械制造有限公司 | Plate shearing machine hydraulic system |
| CN104314894A (en) * | 2014-09-18 | 2015-01-28 | 芜湖高昌液压机电技术有限公司 | Pressure relay type unloading loop for scissor lift |
| CN104988963A (en) * | 2015-06-18 | 2015-10-21 | 力士德工程机械股份有限公司 | Hydraulic excavator movable arm potential energy recovery system |
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