CN106400874A - Energy accumulator based excavator rotating mechanism energy recovery system and method - Google Patents

Abstract

The invention belongs to the field of engineering machinery, and discloses an energy recovery system and method for an excavator slewing mechanism based on an accumulator, which includes a fuel tank, a variable pump, a first reversing valve, a hydraulic motor, a first reversing valve, and a hydraulic motor connected sequentially through pipelines. The first oil circuit and the second oil circuit are connected between the directional valve and the hydraulic motor, the output end of the hydraulic motor is connected with a rotary mechanism and a damping mechanism, and the pipeline between the variable displacement pump and the first directional valve is also connected with a The energy storage pipeline is connected with a hydraulic accumulator, the first oil circuit is connected with a second reversing valve, the second oil circuit is connected with a third reversing valve, and the energy storage pipeline is connected with the second reversing valve and the second reversing valve respectively. The three-way reversing valve is connected through the pipeline to recover and reuse the braking energy of the slewing mechanism of the excavator, which is of great significance to the energy-saving research of the slewing mechanism of the excavator.

Description

Energy recovery system and method for excavator slewing mechanism based on accumulator

technical field

The invention relates to the field of engineering machinery, in particular to an energy accumulator-based energy recovery system and method for a slewing mechanism of an excavator.

Background technique

As a kind of earthwork construction machinery, hydraulic excavator plays a very important role in national infrastructure construction due to its economical and efficient advantages. About 65%-70% of earthwork in various earthwork projects in the world is completed by excavators. .

Excavators often operate in harsh environments with frequent and violent load fluctuations and complex working conditions, which will inevitably lead to problems such as low engine fuel utilization, poor exhaust emissions, and heating of the hydraulic system. With the extensive use of excavators, these problems are becoming more and more obvious. come out. According to statistics, the energy utilization rate of excavators is only about 15%-25%, and the energy loss is mostly lost in the form of heat energy. About 15% of construction machinery failures come from mechanical systems, and 40% come from hydraulic systems. Research on excavator energy saving is not only of positive significance to environmental protection and energy shortage, but also helps to alleviate the heating problem of the hydraulic system and improve the reliability and working life of the hydraulic system of the excavator. maintenance costs.

In a working cycle of the hydraulic excavator, the slewing mechanism accounts for about 50%-70% of the movement time, about 25%-40% of the energy consumption, and about 35%-40% of the heat generation. Therefore, the research on the energy saving of the slewing mechanism is of great significance.

Contents of the invention

The invention provides an energy accumulator-based energy recovery system and method for a rotary mechanism of an excavator, which recovers and reuses the braking energy of the rotary mechanism of an excavator, which is of great significance to energy-saving research on the rotary mechanism of an excavator.

To achieve the above object, the present invention adopts the following technical solutions:

Technical solution one:

An energy recovery system for an excavator slewing mechanism based on an accumulator, including an oil tank, a variable pump, a first reversing valve, and a hydraulic motor connected in sequence through pipelines, and the gap between the first reversing valve and the hydraulic motor is The first oil circuit and the second oil circuit are connected, and the output end of the hydraulic motor is driven and connected with a slewing mechanism and a damping mechanism,

An energy storage pipeline is also connected to the pipeline between the variable displacement pump and the first reversing valve, a hydraulic accumulator is connected to the energy storage pipeline, a second reversing valve is connected to the first oil circuit, A third reversing valve is connected to the second oil circuit, and the energy storage pipeline communicates with the second reversing valve and the third reversing valve through pipelines respectively.

The characteristics and further improvement of the technical solution of the present invention are:

(1) The second reversing valve and the third reversing valve all have an oil inlet, an oil outlet and an oil return port, and the second reversing valve and the third reversing valve have The oil inlets are respectively connected to the first reversing valve through pipelines, the oil outlet on the second reversing valve is connected to a port on the hydraulic motor through the first oil passage, and the first reversing valve The oil outlet on the three-way valve is connected to another port on the hydraulic motor through the second oil passage; The pipeline communicates with the energy storage pipeline at the same time.

(2) The energy storage pipeline is connected with an energy storage valve, the energy storage valve is connected between the hydraulic accumulator and the outlet of the variable displacement pump, the oil return port on the second reversing valve and The oil return port on the third reversing valve is connected between the energy storage valve on the energy storage pipeline and the hydraulic accumulator through a pipeline. (3) The oil return port of the second reversing valve and the oil return port of the third reversing valve are respectively provided with one-way valves on the pipelines that communicate with the energy storage pipeline, and the two one-way valves The conduction directions of the valves respectively face the energy storage pipelines.

(4) A rotational speed sensor and a rotational speed acceleration sensor are arranged on the rotating shaft of the slewing mechanism.

Technical solution two:

An accumulator-based energy recovery method for an excavator's slewing mechanism, the method is applied to the energy recovery system for an excavator's slewing mechanism based on an accumulator described in Technical Solution 1, and the method includes the following steps:

Step 1, when the slewing mechanism of the excavator starts to brake, the braking energy is generated during the braking process of the slewing mechanism of the excavator, and the braking energy is passed through the oil return ports of the second reversing valve and the third reversing valve Transfer to the hydraulic accumulator for recovery and storage; when the slewing mechanism of the excavator is braked, the hydraulic accumulator completes the recovery of braking energy; the braking energy includes at least rotational kinetic energy and frictional heat energy;

Step 2, when the slewing mechanism of the excavator starts in reverse, the hydraulic accumulator releases the recovered braking energy, so that the slewing mechanism of the excavator starts to accelerate in reverse.

The beneficial effects produced by the present invention are: (1) a hydraulic accumulator is added to the slewing mechanism of the traditional excavator, and an energy recovery system based on the accumulator is established; (2) the invention effectively recovers the slewing braking process of the hydraulic excavator The rotational kinetic energy lost in the form of heat energy can not only save energy and reduce the oil temperature of the hydraulic system, but also improve the reliability and service life of the equipment. Secondly, this energy-saving solution can not only be extended to other types of hydraulic excavators, but also provides a reference for related types of construction machinery.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is the schematic diagram of the traditional excavator slewing mechanism hydraulic system simulation model provided by the embodiment of the present invention;

2 is a schematic diagram of a simulation model of an energy recovery system for an excavator slewing mechanism based on an accumulator provided by an embodiment of the present invention;

Fig. 3 is a schematic flowchart of an energy recovery method for an excavator slewing mechanism based on an accumulator provided by an embodiment of the present invention;

Fig. 4 is a schematic diagram of a rotational speed comparison curve in the braking phase provided by an embodiment of the present invention;

Fig. 5 is a schematic diagram of the rotational speed comparison curve in the acceleration phase provided by the embodiment of the present invention;

Fig. 6 is a schematic diagram of gas volume and pressure changes of a hydraulic accumulator provided by an embodiment of the present invention;

Fig. 7 is a schematic diagram of the control signals of the three-position four-way reversing valve and the two-position three-way reversing valve provided by the embodiment of the present invention;

Fig. 8 is a schematic diagram of the energy release control signal of the accumulator provided by the embodiment of the present invention;

Fig. 9 is a schematic diagram of the rotational speed comparison curve of the slewing mechanism reversed when the hydraulic accumulator is powered by the embodiment of the present invention;

Fig. 10 is a schematic diagram of the change of the flow rate and the charging volume when the hydraulic accumulator releases energy according to the embodiment of the present invention.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

An embodiment of the present invention provides an energy recovery system for an excavator turning mechanism based on an accumulator. Exemplarily, as shown in FIG. 1 , it is a schematic diagram of a hydraulic system simulation model of a traditional excavator turning mechanism, including: , Three-position four-way reversing valve 3, one-way valve 4, overflow valve 5, motor 6, rotary mechanism 7 and damping mechanism 8.

As shown in Figure 2, the accumulator-based excavator slewing mechanism energy recovery system provided by the embodiment of the present invention includes an oil tank D, a variable pump 1, a first reversing valve 3, and a hydraulic motor 6 connected in sequence through pipelines. The first reversing valve 3 and the hydraulic motor 6 are connected with a first oil circuit and a second oil circuit, and the output end of the hydraulic motor 6 is connected with a rotary mechanism 7 and a damping mechanism 8. The variable An energy storage pipeline is also connected to the pipeline between the pump 1 and the first reversing valve 3, a hydraulic accumulator B is connected to the energy storage pipeline, and a second reversing valve E2 is connected to the first oil circuit , the third reversing valve E3 is connected to the second oil circuit, and the energy storage pipeline communicates with the second reversing valve E2 and the third reversing valve E3 respectively through pipelines.

Further, both the second reversing valve E2 and the third reversing valve E3 have an oil inlet, an oil outlet and an oil return port, and the second reversing valve E2 and the third reversing valve The oil inlet on the valve E3 is respectively connected to the first reversing valve 3 through pipelines, and the oil outlet on the second reversing valve E2 is connected to the hydraulic motor 6 through the first oil passage. One port is connected, and the oil outlet on the third reversing valve E3 is connected with the other port on the hydraulic motor 6 through the second oil circuit; the second reversing valve E2 and the third reversing valve E2 The oil return port on the reversing valve E3 communicates with the energy storage pipeline through pipelines respectively.

Further, an energy storage valve A is connected to the energy storage pipeline, and the energy storage valve A is connected between the hydraulic accumulator B and the outlet of the variable displacement pump 1, and the second reversing valve E2 and the oil return port on the third reversing valve E3 are connected between the accumulator valve A and the hydraulic accumulator B on the accumulator pipeline through pipelines.

Furthermore, the oil return port of the second reversing valve E2 and the oil return port of the third reversing valve E3 are respectively provided with check valves F on the pipelines connected with the energy storage pipeline, two The conduction directions of the one-way valves F are respectively towards the energy storage pipelines.

Optionally, an overflow valve C is also connected between the port of the hydraulic accumulator B and the oil inlet of the oil tank D, and the overflow valve C can be used as the residual oil recovered in the hydraulic accumulator B When it is too much, send the remaining oil to the fuel tank D.

Further, the energy recovery system further includes a rotational speed sensor and a rotational speed acceleration sensor arranged on the rotating shaft of the slewing mechanism of the excavator, the rotational speed sensor is used to collect the rotational speed of the rotating shaft of the slewing mechanism of the excavator, and the rotational speed acceleration sensor It is used to collect the acceleration of the rotating shaft of the slewing mechanism of the excavator.

In the energy recovery system for the slewing mechanism of an excavator based on an accumulator provided in an embodiment of the present invention, the first reversing valve is a three-position four-way reversing valve, the second reversing valve and the third reversing valve It is a two-position three-way reversing valve, and the energy storage valve is a two-position two-way reversing valve:

When the slewing mechanism of the excavator starts to brake, and the middle position of the three-position four-way reversing valve is connected, and the left position of the two two-position three-way reversing valves is connected, the oil outlet of the hydraulic motor Connect with the hydraulic accumulator through two one-way valves respectively, and the hydraulic accumulator starts to recover the braking energy of the excavator slewing mechanism;

When the braking of the slewing mechanism of the excavator is completed, and the left position of the three-position four-way reversing valve is turned on, the slewing mechanism of the excavator starts to start in reverse;

When the slewing mechanism of the excavator moves in the reverse direction at a constant speed, and the right position of the two-position two-way reversing valve is turned on, the hydraulic accumulator starts to release braking energy, so that the slewing mechanism of the excavator reverses Accelerate start.

An embodiment of the present invention also provides an energy recovery method for an excavator slewing mechanism based on an accumulator. The method is applied to the energy recovery system for an excavator slewing mechanism based on an accumulator described in the above embodiment. The method includes the following step:

Step 1, when the slewing mechanism of the excavator starts to brake, the braking energy is generated during the braking process of the slewing mechanism of the excavator, and the braking energy is passed through the oil return ports of the second reversing valve and the third reversing valve Transfer to the hydraulic accumulator for recovery and storage; when the slewing mechanism of the excavator is braked, the hydraulic accumulator completes the recovery of braking energy; the braking energy includes at least rotational kinetic energy and frictional heat energy;

Step 2, when the slewing mechanism of the excavator starts in reverse, the hydraulic accumulator releases the recovered braking energy, so that the slewing mechanism of the excavator starts to accelerate in reverse.

Specifically, the method includes the following steps:

Step 1, when the slewing mechanism of the excavator starts to brake, the input control signal and the fixed value signal 0 of the three-position four-way reversing valve are respectively input to the first comparator, and the first comparator outputs signal 1;

Step 2, inputting the output signal 1 of the comparator into a proportional amplifier, thereby obtaining the output signal k of the proportional amplifier;

Step 3, using the output signal k of the proportional amplifier as the input control signals of the two two-position three-way reversing valves, so that the left position of each two-position three-way reversing valve is connected, and the hydraulic accumulator starts to recover energy ;

Step 4, when the braking of the slewing mechanism of the excavator is completed, the input control signal of the three-position four-way reversing valve adjusts the left position of the three-position four-way reversing valve to turn on, and the slewing mechanism of the excavator starts to reverse start up;

Step 5, determine the start time and end time for the hydraulic accumulator to release braking energy, and turn on the left position of the two-position two-way reversing valve between the start time and the end time, the hydraulic accumulator The accumulator starts releasing braking energy.

Specifically, in step 5, the determination of the start time and end time of releasing the braking energy of the hydraulic accumulator is specifically:

(5a) Obtain the real-time angular velocity of the rotary shaft of the excavator rotary mechanism collected by the angular velocity sensor after the reverse start, compare the real-time angular velocity of the rotary shaft of the excavator with the set angular velocity threshold, and record that the real-time angular velocity is less than the set angular velocity The first time period of the angular velocity threshold;

(5b) Obtain the real-time angular acceleration absolute value of the rotating shaft after the reverse start of the slewing mechanism of the excavator collected by the angular acceleration sensor, compare the real-time angular acceleration absolute value with the set angular acceleration threshold, and record the real-time angular acceleration a second time period during which the acceleration is less than the angular acceleration threshold;

(5c) Determine the common time period of the first time period and the second time period, the starting moment of the common time period is the starting moment when the hydraulic accumulator releases braking energy, and the common time period The end moment of the time period is the end moment when the hydraulic accumulator releases braking energy.

It should be noted that the embodiment of the present invention adds a hydraulic accumulator circuit to the slewing system of the traditional excavator. During the initial start-up process of the excavator, the slewing mechanism of the excavator works normally according to the traditional mode. When the slewing mechanism of the excavator brakes, the hydraulic pressure The accumulator works.

It should be noted that during the braking process of the excavator return mechanism, the hydraulic accumulator is connected to the circuit under the action of two two-position three-way reversing valves to recover braking energy.

It should be noted that since the slewing mechanism has large speed fluctuations when accelerating and starting, in view of the limited energy recovered by the hydraulic accumulator, the braking energy recovered by the hydraulic accumulator is released when the slewing mechanism moves at a constant speed.

It should be noted that when the two two-position three-way reversing valves are both in the right position, the slewing mechanism of the excavator works in the traditional mode.

The complete working process of the excavator slewing mechanism energy recovery system based on the accumulator provided by the embodiment of the present invention is as follows:

(1) The control signal of the variable pump adjusts the start of the variable pump, the right position of the three-position four-way reversing valve is connected, and the slewing mechanism starts to rotate forward at this time.

(2) The slewing mechanism is started, rotated to the working position, and the excavator starts digging.

(3) After the excavation operation is completed, the excavator rotates to the unloading position, and the slewing mechanism starts to brake.

(4) The control signal of the three-position four-way reversing valve adjusts the three-position four-way reversing valve to be in the neutral position (at this time, the input of the control signal of the variable pump and the control signal of the three-position four-way reversing valve are both 0, and the variable pump The displacement is also 0), the two left two-position three-way reversing valves are in the left position, so that the oil outlet of the motor is connected to the hydraulic accumulator through the two one-way valves, and the hydraulic accumulator starts to store energy .

(5) Under the action of the working pressure of the accumulator, braking is realized. After the braking is completed, the control signal of the three-position four-way reversing valve adjusts the three-position four-way reversing valve to be in the left position, and the slewing mechanism begins to reverse start.

(6) After the slewing mechanism reverses and moves at a constant speed, the control signal of the two-position two-way reversing valve adjusts the two-position two-way reversing valve to the right position, and the accumulator starts to release energy to realize the reverse acceleration of the slewing mechanism.

Exemplarily, as shown in FIG. 4 , it is a schematic diagram of the rotational speed comparison curve between the braking stage of the slewing mechanism of the traditional excavator and the braking stage of the slewing mechanism of the excavator according to the technical solution of the present invention.

It can be seen from Fig. 4 that the excavator slewing device provided by the embodiment of the present invention has less speed fluctuation during the braking phase, and can brake faster, reducing the hydraulic shock of the system during braking.

It can be seen from Figure 5 that during the reverse start of the slewing mechanism of the excavator, the slewing mechanism is accelerated again under the action of the braking energy released by the hydraulic accumulator.

It can be seen from Figure 6 that the pressure and volume of the hydraulic accumulator change accordingly with the recovery and release of braking energy, realizing energy reuse.

In summary, the accumulator-based energy recovery system for the slewing mechanism of excavators provided by the embodiments of the present invention can recover braking energy when the slewing mechanism is braking, and can release energy when the slewing mechanism starts up again.

What needs to be added is that regarding the selection of the timing for the accumulator to release energy, it is necessary to analyze the motion law and energy supply of the slewing mechanism during the motion process.

When the slewing mechanism is started, the pressure at the oil inlet of the motor quickly reaches the set pressure of the relief valve at the pump outlet, and the relief valve overflows the excess flow. Then the motor and the slewing mechanism are accelerated and started. With the increase of the motor speed, the absorption flow increases and the overflow of the relief valve decreases. The pressure of the system remains at the set pressure of the relief valve until the moment of energy release.

When the flow absorbed by the motor is equal to the output flow of the pump, the relief valve will no longer overflow, and the system pressure will begin to drop, but at this time the driving torque generated by the system pressure is still greater than the load resistance torque, so although the rotational acceleration of the slewing mechanism decreases, But still accelerating. With the further increase of the rotational speed, the flow of the motor is in short supply. When the driving torque generated by the system pressure is equal to the rotational resistance torque, the rotational speed of the slewing mechanism reaches the maximum value, and then it will rotate at a constant speed with slight speed fluctuations.

When the overflow valve is opened, the flow rate of the variable displacement pump exceeds the demand, and the speed fluctuates greatly after opening. Since the energy recovered by the hydraulic accumulator is limited, the energy can be released after the speed of the slewing mechanism is stable. At the same time, when the speed of the slewing mechanism tends to be stable, although the speed fluctuates, the rotational acceleration is very small, so the braking energy collected by the hydraulic accumulator is released when the acceleration is small.

The specific steps of the control principle of energy recovery and release provided by the embodiments of the present invention are as follows:

Step 1: Compare the control signal of the three-position four-way reversing valve with the fixed value 0. When the control signal of the three-position four-way reversing valve is 0, output 1 after the comparison.

Step 2: Amplify the output signal according to the ratio k, and use it as the control signal of the two-position three-way reversing valve on the left and right sides.

Step 3: Adjust the control signal of the two-position three-way reversing valve on the left to the left position, and adjust the control signal of the two-position three-way reversing valve on the right to the left position. At this point, the accumulator starts to store energy.

Step 4: After the brake is completed, the three-position four-way reversing valve control signal is adjusted to the left position of the three-position four-way reversing valve, and the slewing mechanism starts to start in reverse.

Step 5: After the slewing mechanism is started in reverse, since the acceleration has a maximum value and drops to 0 when the angular velocity reaches 12r/min, it fluctuates at 0 and the amplitude becomes smaller and smaller. The angular velocity of the rotary mechanism collected by the angular velocity sensor is compared with the set angular velocity threshold (for example, it can be set to 12r/min). When the value is greater than k, the output signal value is 1, otherwise the output signal value is 0.

Step 5: Record the time period when the output signal is 1.

Step 6: Take the absolute value of the angular acceleration of the slewing mechanism collected by the angular acceleration sensor.

Step 7: Compare the absolute value of the angular acceleration with a preset angular acceleration threshold (for example, it can be set to 0.01), and record the time period when the absolute value of the acceleration is less than the preset angular acceleration threshold.

Step 8: Obtain the time period during which the speed value in step 5 is relatively stable and the time period during which the angular acceleration described in step 7 is small, that is, the time period during which the accumulator releases energy as described above is obtained.

Step 9: Compare the clock signal with the fixed value K(1s), and input the clock signal when the value of the clock signal is greater than the value of K(1s).

Step 10: When both steps 8 and 9 are satisfied, the control signal of the two-position two-way reversing valve adjusts the two-position two-way reversing valve to the left position, and the accumulator starts to release energy.

Exemplary, as shown in Figure 7 is the control signal of the three-position four-way reversing valve and the two-position three-way reversing valve, as can be seen from Figure 7, using the three-position four-way reversing valve and the two-position three-way reversing valve The control signal to control the accumulator circuit is simple and easy to operate.

Figure 8 is the control signal of the accumulator to release energy, through the control signal hydraulic accumulator to complete the appropriate amount of release.

As shown in Figure 9, after the hydraulic accumulator releases energy, the rotation speed curve of the slewing mechanism reverses. From Figure 9, it can be clearly seen that the reverse movement of the slewing mechanism is accelerated after the energy is released.

As shown in Figure 10, the change of flow rate and inflated volume when the hydraulic accumulator releases energy, it can be seen from Figure 10 that the time when the hydraulic accumulator releases energy stably is basically consistent with the control signal in Figure 8, which fully proves that the control method is correct and feasible .

The beneficial effects produced by the present invention are: (1) a hydraulic accumulator is added to the slewing mechanism of the traditional excavator, and an energy recovery system based on the accumulator is established; (2) on the basis of the energy recovery system of the accumulator, in the recovery A logic signal control system is added to the system, and the control process of energy recovery and release is verified through the feedback signals of angular velocity and angular acceleration and logical operations. The system achieves the purpose of recovering energy when braking and releasing energy when starting again; (3) the invention effectively recovers the rotational kinetic energy lost in the form of heat energy during the slewing braking process of the hydraulic excavator, thereby not only saving energy and reducing The oil temperature of the hydraulic system also improves the reliability and service life of the equipment. Secondly, this energy-saving solution can not only be extended to other types of hydraulic excavators, but also provides a reference for related types of construction machinery.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (6)

1. a kind of rotating mechanism of dredger energy-recuperation system based on accumulator, including the fuel tank being sequentially connected by pipeline, Variable pump, the first reversal valve, hydraulic motor, are connected with the first oil circuit and between described first reversal valve and described hydraulic motor Two oil circuits, on the outfan of described hydraulic motor drive connection have slew gear and damping mechanism it is characterised in that

Accumulation of energy pipeline is also associated with the pipeline between described variable pump and described first reversal valve, described accumulation of energy pipeline connects There is hydraulic accumulator, described first oil circuit is connected with the second reversal valve, described second oil circuit is connected with the 3rd reversal valve, institute State accumulation of energy pipeline and pass through pipeline connection with described second reversal valve and described 3rd reversal valve respectively.

2. a kind of rotating mechanism of dredger energy-recuperation system based on accumulator according to claim 1, its feature exists In all there is oil-in, oil-out and oil return opening on described second reversal valve and described 3rd reversal valve, described second reversal valve It is connected by pipeline with described first reversal valve respectively with the oil-in on described 3rd reversal valve, on described second reversal valve Oil-out is connected with a port on described hydraulic motor by described first oil circuit, the oil-out on described 3rd reversal valve It is connected with another port on described hydraulic motor by described second oil circuit；Described second reversal valve and described 3rd commutation Oil return opening on valve respectively pass through pipeline simultaneously with described accumulation of energy pipeline connection.

3. a kind of rotating mechanism of dredger energy-recuperation system based on accumulator according to claim 2, its feature exists In accumulation of energy valve being connected with described accumulation of energy pipeline, described accumulation of energy valve is connected to described hydraulic accumulator and described variable pump Outlet between, the oil return opening on oil return opening and described 3rd reversal valve on described second reversal valve is connected to institute by pipeline State between described accumulation of energy valve and the described hydraulic accumulator on accumulation of energy pipeline.

4. a kind of rotating mechanism of dredger energy-recuperation system based on accumulator according to claim 3, its feature exists In on the pipeline that the oil return opening of described second reversal valve is connected with described accumulation of energy pipeline with the oil return opening of described 3rd reversal valve It is respectively arranged with check valve, the conducting direction of two described check valves is respectively facing described accumulation of energy pipeline.

5. a kind of rotating mechanism of dredger energy regenerating system based on accumulator according to any one of claim 1 to 4 System is it is characterised in that be provided with speed probe and rotating speed acceleration sensor in the rotating shaft of described slew gear.

6. a kind of rotating mechanism of dredger energy reclaiming method based on accumulator, methods described is applied to claim 1-5 and appoints The rotating mechanism of dredger energy-recuperation system based on accumulator described in one it is characterised in that methods described include as follows Step：

Step 1, when rotating mechanism of dredger starts braking, produces Brake Energy in described rotating mechanism of dredger braking procedure Amount, described braking energy is sent to hydraulic accumulator by the oil return opening of the second reversal valve and the 3rd reversal valve and carries out reclaiming storage Deposit；When the braking of described rotating mechanism of dredger completes, hydraulic accumulator completes the recovery of braking energy；Described braking energy is extremely Comprise rotational kinetic energy and frictional heat energy less；

Step 2, when described rotating mechanism of dredger reverse starting, the braking energy of recovery is released by described hydraulic accumulator Put, so that described rotating mechanism of dredger reversely accelerates to start.