CN212318407U - Swing arm potential energy recovery and reuse system - Google Patents

Swing arm potential energy recovery and reuse system Download PDF

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Publication number
CN212318407U
CN212318407U CN202020704807.4U CN202020704807U CN212318407U CN 212318407 U CN212318407 U CN 212318407U CN 202020704807 U CN202020704807 U CN 202020704807U CN 212318407 U CN212318407 U CN 212318407U
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port
reversing valve
valve
hydraulic
hydraulic pump
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李建松
张文婷
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Xuzhou College of Industrial Technology
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Xuzhou College of Industrial Technology
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Abstract

A movable arm potential energy recovery and reuse system is characterized in that a generator is coaxially connected with a hydraulic pump, an oil suction port S of the hydraulic pump is connected with an oil tank, an oil discharge port P of the hydraulic pump is connected with a port P of a main reversing valve through a first one-way valve, and a port A and a port B of the main reversing valve are respectively connected with a rod cavity and a rodless cavity of a movable arm hydraulic cylinder; the port A and the port P of the first reversing valve are respectively connected with the port T of the main reversing valve and the port P of the hydraulic pump motor, the port T of the first reversing valve and the port T of the hydraulic pump motor are both connected with an oil tank, the port B of the first reversing valve is respectively connected with the energy accumulator, the pressure detection device and the port P of the second reversing valve through a second one-way valve, the port A of the second reversing valve is connected with the port P of the hydraulic motor, the port T of the hydraulic motor is connected with the oil tank, and the output shaft of the hydraulic motor is connected with a fan; an output shaft of the hydraulic pump motor is connected with a transmission shaft of the flywheel through the transmission and the first clutch in sequence. The system can effectively recover the potential energy of the movable arm, and cannot influence the original system.

Description

Swing arm potential energy recovery and reuse system
Technical Field
The utility model belongs to the technical field of hydraulic control, specifically a swing arm potential energy recovery and system of recycling.
Background
The arm support of large-scale engineering machinery has very large mass. Taking an excavator as an example, in the working process of the excavator, the lifting action of a movable arm is frequent, and a large amount of potential energy can be released in the descending process due to the large mass of a working device and a load.
Fig. 1 is a schematic diagram of a current general excavator structure. The end of the boom 100 is hinged to the turntable 200, the cylinder of the boom cylinder 4 is hinged to the turntable 200, and the piston rod end of the boom cylinder 4 is hinged to the middle of the boom 100. When the piston rod of the boom cylinder 4 makes a telescopic motion, the boom 100 is driven to perform lifting and lowering actions. During the working process of the excavator, the movable arm frequently moves up and down, and a large amount of potential energy can be released during the descending process due to the fact that the working device and the load are large in mass. Fig. 2 is a simplified schematic diagram of a prior art excavator boom hydraulic system. As can be seen from fig. 1 and 2, most of the potential energy is consumed at the valve port of the main directional control valve 3 and converted into heat energy, which not only wastes energy, but also greatly increases the heat generation of the system, and at the same time, the high temperature of the oil also reduces the service life of the hydraulic component. Therefore, the research on the potential energy recycling and reusing of the movable arm has important significance for prolonging the service life of equipment and improving the energy utilization rate.
At present, the potential energy recovery mode of a movable arm of an engineering machine mainly comprises an electric type and a hydraulic type. The electric power type mainly adopts a hydraulic motor and a generator as energy conversion elements, and a storage battery and a super capacitor as energy storage elements so as to realize energy conversion and recovery. However, the time of the boom descending process is very short, usually only 3-6 s, and the energy is large, so the power is large. The prior art battery is difficult to withstand such a large charging power. The super capacitor is very expensive and requires a large installation space, so that the electric power recovery is not practical. The hydraulic energy recovery system takes a variable hydraulic pump or a hydraulic motor as an energy conversion element and takes an energy accumulator as an energy storage element. The working principle is that when the gravitational potential energy of the system is recovered, the potential energy of the movable arm is recovered through the variable hydraulic pump or the hydraulic motor and converted into hydraulic energy, the hydraulic energy is stored in the hydraulic energy accumulator, and when the system needs energy, the stored energy is released to assist the engine to do work outwards. The hydraulic recovery scheme utilizes the advantages of large power density of a hydraulic element, capability of absorbing pressure impact and the like, but the density of energy stored by the energy accumulator is low, if more energy needs to be stored, the energy accumulator with a larger volume is needed, and then the energy accumulator occupies a larger installation space, and the installation of the energy accumulator is also very inconvenient, so that the recovery practicability is not strong.
Disclosure of Invention
To the problem that above-mentioned prior art exists, the utility model provides a swing arm potential energy recovery and system of recycling, this system can carry out effectual recovery to swing arm potential energy, and can not exert an influence to original system, simultaneously, can not only avoid the waste of energy with the energy direct action of retrieving in the system, simultaneously, also can reach energy-conserving purpose.
In order to achieve the above object, the utility model provides a movable arm potential energy recovery and recycle system, including generator, hydraulic pump, oil tank, first check valve, main directional control valve, movable arm pneumatic cylinder and energy storage ware, first directional control valve, hydraulic pump motor, second check valve, pressure detection device, second directional control valve, hydraulic motor, fan, derailleur, first clutch and flywheel; the generator is coaxially connected with the hydraulic pump, an oil suction port S of the hydraulic pump is connected with an oil tank, an oil discharge port P of the hydraulic pump is connected with a port P of the main reversing valve through a first one-way valve, and a port A and a port B of the main reversing valve are respectively connected with a rod cavity and a rodless cavity of the movable arm hydraulic cylinder;
the port A and the port P of the first reversing valve are respectively connected with the port T of the main reversing valve and the port P of the hydraulic pump motor, the port T of the first reversing valve and the port T of the hydraulic pump motor are both connected with an oil tank, the port B of the first reversing valve is respectively connected with the energy accumulator, the pressure detection device and the port P of the second reversing valve through a second one-way valve, the port A of the second reversing valve is connected with the port P of the hydraulic motor, the port T of the hydraulic motor is connected with the oil tank, and the output shaft of the hydraulic motor is connected with a fan;
and an output shaft of the hydraulic pump motor is connected with a transmission shaft of the flywheel through the transmission and the first clutch in sequence.
Furthermore, in order to conveniently realize an automatic control process, the hydraulic excavator further comprises a controller, and the controller is respectively connected with the pressure detection device, the hydraulic pump, the main reversing valve, the first clutch, the first reversing valve, the second reversing valve, the hydraulic pump motor, the transmission and the control handle of the excavator.
Furthermore, in order to ensure that the system works within a safe pressure range, the energy accumulator is also connected with the oil tank through an overflow valve.
Preferably, the main reversing valve is a three-position four-way electromagnetic reversing valve, the electromagnet Y1b works at the left position when electrified, the electromagnet Y1a works at the right position when electrified, and the two electromagnets work at the middle position when not electrified; when the valve works at the left position, the oil path between the port P and the port A is connected, and the oil path between the port T and the port B is communicated; when the hydraulic control valve works at the right position, the oil path between the port P and the port B is connected, and the oil path between the port T and the port A is communicated; when the valve works in the middle position, the oil path between the port P and the port A is disconnected, and the oil path between the port T and the port B is disconnected.
Preferably, the first directional control valve is a two-position four-way electromagnetic directional control valve, the electromagnet Y2 works at the right position when being electrified, the oil path between the port B and the port T is communicated, the oil path between the port A and the port P is communicated, the electromagnet Y2 works at the left position when being not electrified, the oil path between the port A and the port T is communicated, and the oil path between the port B and the port P is communicated.
Preferably, the second directional valve is a two-position two-way electromagnetic directional valve, the electromagnet Y3 works at the right position when powered, the oil path between the port a and the port P is communicated, the electromagnet Y3 works at the left position when not powered, and the oil path between the port a and the port P is disconnected.
The utility model discloses in, through having concatenated first switching-over valve and hydraulic pump motor between main switching-over valve and oil tank, can transfer the in-process at the swing arm, turn into the potential energy of swing arm the rotatory mechanical energy of flywheel to can save, thereby can avoid because of turning into the extravagant phenomenon that heaies up with hydraulic component of energy that fluid heat energy caused. The recovered energy acts on the hydraulic pump motor, and can be stored in the energy accumulator through the first reversing valve, so that stable power supply can be provided for the subsequent fan operation. When heat dissipation is needed, the working state of the second reversing valve is controlled to be changed, so that stable power supply can be carried out by using oil in the energy accumulator, and energy can be recycled by driving the heat dissipation fan. The system can reduce the power requirement of a heat dissipation subsystem in the hydraulic system on the engine, and has a remarkable energy-saving effect.
Drawings
FIG. 1 is a schematic diagram of a prior art excavator;
FIG. 2 is a schematic diagram of a hydraulic system of a boom subsystem and a heat dissipation subsystem of an excavator in the prior art;
fig. 3 is a schematic view of the hydraulic principle of the present invention.
In the figure: 1. the hydraulic control system comprises a hydraulic pump, 2, a first one-way valve, 3, a main reversing valve, 4, a movable arm hydraulic cylinder, 5, an oil tank, 6, an engine, 7, a hydraulic pump motor, 8, a flywheel, 9, a first clutch, 10, a gearbox, 11, a first reversing valve, 12, an auxiliary hydraulic pump, 13, a second one-way valve, 14, an accumulator, 15, a second reversing valve, 16, an overflow valve, 17, a pressure detection device, 20, a radiator, 21, a hydraulic motor, 22, a fan, 23 and a system oil return pipeline;
100. a movable arm 200 and a turntable.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
The working principle of the excavator is described by taking the excavator as an example, and the excavator can also be used for arm support type engineering machinery such as a crane and a loader which are similar to the excavator.
Fig. 1 is a schematic view illustrating an assembly structure of a boom 100, a turntable 200, and a boom cylinder 4 in a conventional excavator, in which an end portion of the boom 100 is hinged to the turntable 200, a cylinder tube of the boom cylinder 4 is hinged to the turntable 200, and a piston rod end of the boom cylinder 4 is hinged to a middle portion of the boom 100. When the piston rod of the boom cylinder 4 makes a telescopic motion, the boom 100 is driven to perform lifting and lowering actions.
Fig. 2 is a schematic diagram of a hydraulic system of a boom subsystem and a heat dissipation subsystem of an excavator in the prior art, and the hydraulic system comprises the boom subsystem and the heat dissipation subsystem. The movable arm subsystem comprises a hydraulic pump 1, a first one-way valve 2, a main reversing valve 3, a movable arm hydraulic cylinder 4, an oil tank 5, an engine 6 and the like. The engine 6 powers the system. The hydraulic pump 1 functions to convert mechanical energy of the engine 6 into pressure energy of oil, and to provide high-pressure oil to the system. The first check valve 2 ensures that high-pressure oil provided by the oil source can only flow to the main reversing valve 3 in a one-way mode. The main directional control valve 3 shown in fig. 2 is a three-position four-way electromagnetic directional control valve. In a practical hydraulic system, the valve may be a three-position, four-way valve or a three-position, six-way valve. The reversing mode of the main reversing valve 3 can be electrically controlled, and can also be hydraulically controlled. When the electromagnet Y1a of the main reversing valve 3 is electrified, the main reversing valve 3 works at the right position, oil liquid provided by the hydraulic pump 1 enters a rodless cavity of the movable arm hydraulic cylinder 4 from a port P to a port B of the main reversing valve 3, and oil liquid in a rod cavity of the hydraulic pump flows back to the oil tank 5 from the port A to the port T of the main reversing valve 3. Referring to fig. 1, when the piston rod of the boom cylinder 4 extends, the boom 100 is lifted. When the electromagnet Y1b is energized, the main directional control valve 3 operates in the left position. The oil liquid provided by the hydraulic pump 1 enters the rod cavity of the movable arm hydraulic cylinder 4 from the port P to the port A of the main reversing valve 3, and the oil liquid in the rodless cavity flows back to the oil tank 5 from the port B to the port T of the main reversing valve 3. The piston rod of the boom cylinder 4 is retracted, corresponding to the lowering operation of the boom 100 in fig. 1. At this time, a load such as the boom 100 acts on the piston rod of the boom cylinder 4, and therefore the pressure of the rodless chamber of the boom cylinder 4 is large. When the oil flowing out of the rodless chamber passes through the valve port of the main directional control valve 3, these pressures are consumed at the valve port, and thus much heat is generated. The heat dissipation subsystem includes an auxiliary hydraulic pump 12, a hydraulic motor 21, a fan 22, and a radiator 20. The auxiliary hydraulic pump 12 is usually an external control type constant pressure variable pump, and can change the set pressure according to signals; the auxiliary hydraulic pump 12 is driven by the engine 6 to operate and supply high-pressure oil to the outside. The high-pressure oil discharged from the auxiliary hydraulic pump 12 enters the hydraulic motor 21. The oil discharged from the hydraulic motor 21 is returned to the tank 5. The radiator 20 is arranged on a hydraulic system oil return pipeline 23 of the whole excavator. The mechanical energy output from the hydraulic motor 21 drives the fan 22 to cool the oil flowing through the radiator 20.
As shown in fig. 3, a boom potential energy recovery and reuse system includes a generator 6, a hydraulic pump 1, an oil tank 5, a first check valve 2, a main directional control valve 3, a boom hydraulic cylinder 4, an energy accumulator 14, a first directional control valve 11, a hydraulic pump motor 7, a second check valve 13, a pressure detection device 17, a second directional control valve 15, a hydraulic motor 21, a fan 22, a transmission 10, a first clutch 9, and a flywheel 8; the first clutch 9 is preferably an electromagnetic clutch which can be switched on or off under the action of a control signal. The transmission 10 is preferably a continuously variable transmission, which can vary the transmission ratio between an input shaft and an output shaft. The generator 6 is coaxially connected with the hydraulic pump 1, the oil suction port S of the hydraulic pump 1 is connected with the oil tank 5, the oil discharge port P of the hydraulic pump is connected with the port P of the main reversing valve 3 through the first one-way valve 2, and the port A and the port B of the main reversing valve 3 are respectively connected with the rod cavity and the rodless cavity of the movable arm hydraulic cylinder 4;
the port A and the port P of the first reversing valve 11 are respectively connected with the port T of the main reversing valve 3 and the port P of the hydraulic pump motor 7, the port T of the first reversing valve 11 and the port T of the hydraulic pump motor 7 are both connected with the oil tank 5, the port B of the first reversing valve 11 is respectively connected with the energy accumulator 14, the pressure detection device 17 and the port P of the second reversing valve 15 through the second one-way valve 13, the port A of the second reversing valve 15 is connected with the port P of the hydraulic motor 21, the T of the hydraulic motor 21 is connected with the oil tank 5, and the output shaft of the hydraulic motor 21 is connected with the fan 22;
the output shaft of the hydraulic pump motor 7 is connected to the drive shaft of the flywheel 8 via a transmission 10 and a first clutch 9.
In order to conveniently realize the automatic control process, the hydraulic excavator further comprises a controller, and the controller is respectively connected with the pressure detection device 17, the hydraulic pump 1, the main reversing valve 3, the first clutch 9, the first reversing valve 11, the second reversing valve 15, the hydraulic pump motor 7, the transmission 10 and a control handle of the excavator. Preferably, the controller is a PLC controller.
The pressure sensing device 17 may measure the pressure of the accumulator 14 and send it to the controller in the form of an electrical signal.
In order to ensure that the system is within a safe pressure range, the accumulator 14 is also connected to the tank 5 via a relief valve 16. The relief valve 16 serves to limit the maximum working pressure of the accumulator 14.
Preferably, the hydraulic pump motor 7 is an external control type constant pressure variable pump.
Preferably, the main reversing valve 3 is a three-position four-way electromagnetic reversing valve, the electromagnet Y1b works in the left position when electrified, the electromagnet Y1a works in the right position when electrified, and the two electromagnets work in the middle position when not electrified; when the valve works at the left position, the oil path between the port P and the port A is connected, and the oil path between the port T and the port B is communicated; when the hydraulic control valve works at the right position, the oil path between the port P and the port B is connected, and the oil path between the port T and the port A is communicated; when the valve works in the middle position, the oil path between the port P and the port A is disconnected, and the oil path between the port T and the port B is disconnected.
Preferably, the first switching valve 11 is a two-position four-way electromagnetic switching valve, and when the electromagnet Y2 is energized, it operates in the right position, the oil passages between the ports B and T are communicated, the oil passages between the ports a and P are communicated, when the electromagnet Y2 is not energized, it operates in the left position, the oil passages between the ports a and T are communicated, and the oil passages between the ports B and P are communicated.
Preferably, the second direction valve 15 is a two-position two-way electromagnetic direction valve, the electromagnet Y3 is operated in the right position when energized, the oil path between the port a and the port P is communicated, the electromagnet Y3 is operated in the left position when not energized, and the oil path between the port a and the port P is disconnected.
The working principle is as follows:
firstly, a movable arm lifting process:
the working principle of this part is consistent with that of the prior art. Referring to fig. 1 and 3, when the boom is lifted, the controller energizes the electromagnet Y1a of the main directional control valve 3, and the hydraulic pump 1 is driven by the engine 6, so that the discharged oil is supplied to the port P of the main directional control valve 3 through the first check valve 2, and then enters the rodless chamber of the boom cylinder 4 through the port B of the main directional control valve 3. The oil in the rod chamber of the boom cylinder 4 flows back to the oil tank 5 through the ports a to T of the main directional control valve 3. Therefore, the piston rod of the hydraulic cylinder 4 extends, and the boom 100 is lifted.
II, energy recovery stage:
with reference to fig. 1 and 3, when the movable arm 100 needs to be lowered, an operator sends a lowering electric signal to the controller through the operating handle, and the controller (not shown) receives the lowering electric signal and then controls the electromagnet Y1b of the main directional control valve 3 to be powered on, and controls the electromagnet of the first directional control valve 11 to be powered on and the first clutch 9 to be powered on for actuation; the first reversing valve 11 works in the right position after being electrified. The hydraulic pump 1 is driven by the engine 6, and the discharged oil enters a rod cavity of the movable arm hydraulic cylinder 4 from a port P to a port A of the main reversing valve 3 through the first check valve 2. The oil in the rodless cavity of the boom cylinder 4 flows through the ports B to T of the main directional control valve 3 and the ports a to P of the first directional control valve 11, passes through the hydraulic pump motor 7, and then flows back to the oil tank 5. The hydraulic fluid discharged from the rodless chamber of the boom cylinder 4 has a high pressure due to the gravity of the working mechanism such as the boom. The hydraulic pump motor 7 operates in a motor mode, and drives the flywheel 8 to rotate at an accelerated speed through the transmission 10 and the first clutch 9, so that the gravitational potential energy of the boom 100 is effectively recovered by the flywheel 8.
Preferably, a rotation speed detection device may be further disposed near the flywheel 8 for detecting a rotation speed signal of the flywheel 8 and transmitting the rotation speed signal to the controller in real time;
in the above process, the piston rod of the boom cylinder 4 retracts, and the boom 100 descends. During the descending process of the boom 100, the controller may appropriately adjust the displacement of the hydraulic pump motor 7 and the transmission ratio of the transmission 10 according to the real-time rotation speed of the flywheel 8, so as to drive the flywheel 8 to accelerate continuously. In this way, the gravitational potential energy of the working device such as the boom is converted into the kinetic energy of the rotation of the flywheel 8.
Thirdly, energy recycling process:
when the movable arm subsystem does not work and available energy is available in the flywheel 8, the energy can be matched by the controller according to the real-time rotating speed of the flywheel 8, and the controller enables the first clutch 9 to be closed. At the same time, the swing angle of the hydraulic pump motor 7 is controlled to reverse, so that the pump mode is operated. The flywheel 8 drives the hydraulic pump motor 7 to rotate via the first clutch 9 and the transmission 10. The hydraulic pump motor 7 sucks oil from the oil tank 5, and the discharged oil enters the energy accumulator 14 through the port P to the port B of the first reversing valve and the port A to the port B of the second one-way valve 13 to be stored with recovered energy.
Fourthly, when the fan works:
preferably, a temperature sensor for detecting the temperature of the oil is arranged on the system return pipeline 23, the temperature sensor sends a temperature signal detected in real time to the controller, and the controller obtains the real-time temperature of the system oil according to the received temperature signal.
When the oil temperature of the system reaches a certain value and needs to be cooled, the controller enables the electromagnet of the second reversing valve 15 to be electrified, so that the electromagnet works at the right position. The oil stored in the accumulator 14 flows through the port P to the port a of the second switching valve 15, passes through the hydraulic motor 21, and then flows back to the oil tank 5. The hydraulic motor 21 drives a fan 22 to rapidly cool the oil flowing through the radiator 20.
Since the boom raising and lowering operation is not continuous, the charging of the accumulator 14 by the flywheel 8 is also intermittent. The fan 22 is often required to operate continuously so that the accumulator 14 is available to provide a constant supply of oil to the hydraulic motor 21.
When the pressure detecting device 17 detects that the pressure of the accumulator 14 exceeds a certain value, which indicates that the accumulator 14 reaches the energy storage limit, the controller will control the flywheel 8 to stop charging the accumulator 14.
Fifthly, during flywheel braking:
when the flywheel 8 needs to be braked in an emergency, for example, when an operator sends a braking signal through the control handle, the controller enables the first clutch 9 to be attracted after receiving the braking signal, controls the hydraulic pump motor 7 to work in a pump mode, and keeps the electromagnets of the first reversing valve and the second reversing valve not powered. The flywheel 8 will continue to dissipate its own kinetic energy and drive the hydraulic pump motor 7 via the first clutch 9 and the transmission 10, charging the accumulator 14. In this mode, the controller will ignore the pressure signal of the accumulator 14 as measured by the pressure sensing device 17. That is, even if the accumulator 14 has been filled with oil, the hydraulic pump motor 7 will continue to output oil, which will likely cause the operation of the accumulator 14 to reach the set value of the relief valve 16. This portion of the oil will flow back to the tank from port P to port T of spill valve 16. Thereby completing the consumption of the kinetic energy of the flywheel 8 and realizing the braking of the flywheel 8.
To sum up, the utility model provides a retrieve swing arm potential energy and be used for radiator fan's hydraulic system can turn into the rotatory mechanical energy of flywheel with the potential energy of swing arm, can avoid extravagant because of the energy that turns into fluid heat energy and cause. The recovered energy drives the auxiliary hydraulic pump through the flywheel and is used for driving the cooling fan to recycle. The energy accumulator can balance the flow demand of the hydraulic motor in the heat dissipation system and ensure the stable work of the heat dissipation fan. The system can reduce the power requirement of a heat dissipation subsystem in the hydraulic system on the engine, and has a remarkable energy-saving effect.

Claims (6)

1. A movable arm potential energy recovery and reuse system comprises a generator (6), a hydraulic pump (1), an oil tank (5), a first one-way valve (2), a main reversing valve (3), a movable arm hydraulic cylinder (4) and an energy accumulator (14), wherein the generator (6) is coaxially connected with the hydraulic pump (1), an oil suction port S of the hydraulic pump (1) is connected with the oil tank (5), an oil discharge port P of the hydraulic control system is connected with a port P of a main reversing valve (3) through a first one-way valve (2), a port A and a port B of the main reversing valve (3) are respectively connected with a rod cavity and a rodless cavity of a movable arm hydraulic cylinder (4), the hydraulic control system is characterized by further comprising a first reversing valve (11), a hydraulic pump motor (7), a second one-way valve (13), a pressure detection device (17), a second reversing valve (15), a hydraulic motor (21), a fan (22), a transmission (10), a first clutch (9) and a flywheel (8);
an A port and a P port of a first reversing valve (11) are respectively connected with a T port of a main reversing valve (3) and a P port of a hydraulic pump motor (7), the T port of the first reversing valve (11) and the T port of the hydraulic pump motor (7) are both connected with an oil tank (5), a B port of the first reversing valve (11) is respectively connected with an energy accumulator (14), a pressure detection device (17) and the P port of a second reversing valve (15) through a second one-way valve (13), the A port of the second reversing valve (15) is connected with the P port of a hydraulic motor (21), the T of the hydraulic motor (21) is connected with the oil tank (5), and an output shaft of the hydraulic motor (21) is connected with a fan (22);
an output shaft of the hydraulic pump motor (7) is connected with a transmission shaft of the flywheel (8) through a transmission (10) and a first clutch (9) in sequence.
2. The boom potential energy recovery and reuse system according to claim 1, further comprising a controller, wherein the controller is connected to the pressure detection device (17), the hydraulic pump (1), the main directional control valve (3), the first clutch (9), the first directional control valve (11), the second directional control valve (15), the hydraulic pump motor (7), the transmission (10) and a control handle of the excavator respectively.
3. A boom potential energy recovery and reuse system according to claim 1 or 2, characterized in that said accumulator (14) is further connected to the tank (5) through an overflow valve (16).
4. The system for recovering and recycling the potential energy of the movable arm according to claim 3, wherein the main reversing valve (3) is a three-position four-way electromagnetic reversing valve, the electromagnet Y1b works in the left position when electrified, the electromagnet Y1a works in the right position when electrified, and the electromagnets work in the middle position when not electrified; when the valve works at the left position, the oil path between the port P and the port A is connected, and the oil path between the port T and the port B is communicated; when the hydraulic control valve works at the right position, the oil path between the port P and the port B is connected, and the oil path between the port T and the port A is communicated; when the valve works in the middle position, the oil path between the port P and the port A is disconnected, and the oil path between the port T and the port B is disconnected.
5. The system for recovering and recycling potential energy of the movable arm according to claim 4, wherein the first reversing valve (11) is a two-position four-way electromagnetic reversing valve, an electromagnet Y2 of the system works at a right position when being electrified, an oil path between the port B and the port T is communicated, an oil path between the port A and the port P is communicated, an electromagnet Y2 of the system works at a left position when not being electrified, the oil path between the port A and the port T is communicated, and the oil path between the port B and the port P is communicated.
6. The system for recovering and recycling potential energy of the movable arm according to claim 5, wherein the second reversing valve (15) is a two-position two-way electromagnetic reversing valve, an electromagnet Y3 of the second reversing valve works at a right position when being electrified, an oil path between the port A and the port P is communicated, an electromagnet Y3 of the second reversing valve works at a left position when not being electrified, and the oil path between the port A and the port P is disconnected.
CN202020704807.4U 2020-04-30 2020-04-30 Swing arm potential energy recovery and reuse system Active CN212318407U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112942480A (en) * 2021-01-29 2021-06-11 徐州徐工挖掘机械有限公司 Hydraulic system of hybrid engineering machinery and hybrid engineering machinery

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112942480A (en) * 2021-01-29 2021-06-11 徐州徐工挖掘机械有限公司 Hydraulic system of hybrid engineering machinery and hybrid engineering machinery

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