Excavator boom potential energy recovery and reuse device based on balanced oil cylinder and working principle

Abstract

The application discloses a device and working principle for excavator boom potential energy recovery and reuse based on an auxiliary oil cylinder, which realizes the recovery and reuse of the boom potential energy through an auxiliary oil cylinder and two accumulators with the same parameters; during the boom lowering process, the oil at the hydraulic pump outlet is introduced into the rod cavity of the boom cylinder and the rod cavity of the auxiliary oil cylinder, the oil in the rodless cavity of the auxiliary oil cylinder is returned to the oil tank, the high-pressure oil in the rodless cavity of the boom cylinder is introduced into the two accumulators with the same parameters, and the boom potential energy is recovered and stored; during the boom lifting process, the oil in the rod cavities of the boom cylinder and the auxiliary oil cylinder is returned to the oil tank, the oil at the hydraulic pump outlet is introduced into the rodless cavity of the boom cylinder to drive the boom to rise, the pressure oil in one accumulator is introduced into the rodless cavity of the auxiliary oil cylinder to assist the boom to rise, the pressure oil in the other accumulator is introduced into the oil inlet of the hydraulic pump to reduce the output torque of the engine, and the boom potential energy is released.

Description

Technical Field

[0001] This invention relates to the fields of mechanical design, fluid transmission and control, energy consumption and energy saving in engineering machinery, and particularly to the field of potential energy recovery and reuse of excavator booms. Background Technology

[0002] Hydraulic excavators are the most widely used construction machinery in various earthmoving projects. Due to their unique working mechanism, the excavator's boom frequently rises and falls. During the boom's descent, the hydraulic energy converted from the gravitational potential energy of the boom, stick, and bucket is transformed into heat energy under the throttling effect of various control valves, resulting in significant energy loss. Simultaneously, the generated high temperatures can damage some components of the excavator, reducing its reliability and service life. Properly recovering and reusing this energy can not only improve the energy efficiency of the excavator during operation, reduce energy consumption and emissions, but also extend the excavator's service life and economic efficiency, and lower its operating and maintenance costs.

[0003] The existing method for recovering and reusing the potential energy of excavators based on auxiliary cylinders is to recover the pressure oil and energy of the two boom cylinders through an accumulator, and then to send all the pressure oil in the accumulator into the auxiliary cylinder when the boom rises. This method has strict limitations on the specific parameters of the auxiliary cylinder, does not meet the requirements of parts standardization, and increases the cost of modification. Summary of the Invention

[0004] To address the aforementioned problems, this invention proposes a device and its working principle for the recovery and reuse of potential energy from an excavator boom based on an auxiliary hydraulic cylinder. This addresses the issue of excessively high modification costs in existing technologies due to strict limitations on the parameters of the auxiliary hydraulic cylinder.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A device for recovering and reusing the potential energy of an excavator boom based on a balance cylinder and its working principle are disclosed. The device includes: a boom cylinder 11, a boom cylinder 13, an auxiliary cylinder 12, a three-position four-way directional valve 7, a three-position four-way directional valve 10, an energy storage unit 18, a check valve 3, a relief valve 2, a throttle valve 16, an engine 14, a hydraulic pump 1, an oil tank 15, and an oil tank 17. The rod chamber of the auxiliary cylinder 12 is connected to the rod chambers of both the boom cylinder 11 and the boom cylinder 13. The three-position four-way directional valve 10 is connected to the energy storage unit 18 and the boom cylinder 11. The rodless chamber, the rodless chamber of boom cylinder 13, the rodless chamber of auxiliary cylinder 12, and the three-position four-way directional valve 7 are all connected. The three-position four-way directional valve 7 is connected to the three-position four-way directional valve 10, the oil outlet of hydraulic pump 1, the oil tank 17, the rod chamber of boom cylinder 11, the rod chamber of boom cylinder 13, and the rod chamber of auxiliary cylinder 12. The engine 14 is coaxially connected to hydraulic pump 1. The overflow valve 2 is connected to the outlet of hydraulic pump 1 and the oil tank 15. The check valve 3 is connected to the oil inlet of hydraulic pump 1, the oil tank 15, and the throttle valve 16. The throttle valve 16 is connected to the energy storage unit 18.

[0007] In an embodiment, the energy storage unit 18 includes a two-position two-way reversing valve 4, a two-position two-way reversing valve 6, a two-position two-way reversing valve 9, an accumulator 5, and an accumulator 8. The accumulator 8 is connected to both the two-position two-way reversing valve 6 and the two-position two-way reversing valve 9, and the accumulator 5 is connected to both the two-position two-way reversing valve 4 and the two-position two-way reversing valve 6.

[0008] In this embodiment, the two-position two-way reversing valve 9 in the energy storage unit 18 is connected to the three-position four-way reversing valve 10, and the two-position two-way reversing valve 4 is connected to the throttle valve 16.

[0009] The technical effects achieved by this invention are as follows:

[0010] The auxiliary cylinder parameters are exactly the same as the boom cylinder parameters, which better meets the requirements of parts standardization and reduces the modification cost. When the boom is lowered, the hydraulic energy converted from the potential energy of the working device when the boom cylinder 11 and boom cylinder 13 are lowered is recovered through two accumulators 5 and 8 with the same parameters, ensuring that the two accumulators absorb the same amount of energy. When the boom is raised, the pressure oil stored in the accumulator 8 is introduced into the rodless chamber of the auxiliary cylinder 12 to assist the boom in raising. The pressure oil in the accumulator 5 is introduced into the oil inlet of the hydraulic pump 1 to reduce the output torque of the engine 14. The accumulator 5 is connected to the two-position two-way reversing valve 4, which is connected to the throttle valve 16. The throttle valve 16 can regulate the oil release speed in the accumulator 5. Under the action of the throttle valve 16, the oil pressure in the accumulator 5 and the accumulator 8 can be controlled to be equal in real time, which facilitates the recovery of the pressure oil in the rodless chamber of the boom cylinder 11 and the rodless chamber of the boom cylinder 13 when the boom is lowered again. Attached Figure Description

[0011] To more clearly illustrate the technical embodiments of the present invention, the accompanying drawings used will be briefly described below.

[0012] Figure 1 This is a schematic diagram of the hydraulic principle of the hydraulic system for recovering and reusing the potential energy of the excavator boom according to an embodiment of the present invention. Attached image description:

[0014] 1-Hydraulic pump, 2-Relief valve, 3-Check valve, 4, 6, 9-Two-position two-way directional valve, 5, 8-Accumulator, 7, 10-Three-position four-way directional valve, 11, 13-Boom cylinder, 12-Auxiliary cylinder, 14-Engine, 15, 17-Fuel tank, 16-Throttle valve, 18-Energy storage unit. Detailed Implementation

[0015] Unless otherwise expressly defined, in the claims, description, and accompanying drawings of this invention, the use of directional terms such as "center," "lateral," "longitudinal," "horizontal," "vertical," "top," "bottom," "inner," "outer," "upper," "lower," "front," "rear," "left," "right," "clockwise," and "counterclockwise" to indicate orientation or positional relationships is based on the orientation and positional relationships shown in the accompanying drawings and is only for the convenience of describing the invention and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the specific scope of protection of this invention.

[0016] Unless otherwise expressly defined, the terms "fixed connection" or "fixed connection" used in the claims, description and drawings of this invention should be interpreted broadly, that is, any connection in which there is no displacement or relative rotation relationship between the two parties, including non-removable fixed connections, detachable fixed connections, integral connections and fixed connections through other devices or elements.

[0017] In the claims, description and accompanying drawings of this invention, the terms "comprising," "having," and variations thereof are used to mean "including but not limited to."

[0018] like Figure 1As shown, the hydraulic system for boom potential energy recovery and reuse includes: boom cylinder 11, boom cylinder 13, auxiliary cylinder 12, three-position four-way directional valve 7, three-position four-way directional valve 10, energy storage unit 18, check valve 3, relief valve 2, throttle valve 16, engine 14, hydraulic pump 1, oil tank 15, and oil tank 17. The rod chamber of auxiliary cylinder 12 is connected to the rod chambers of boom cylinder 11 and boom cylinder 13. The three-position four-way directional valve 10 is connected to the energy storage unit 18, the rodless chamber of boom cylinder 11, and the boom cylinder... The rodless chamber of cylinder 13, the rodless chamber of auxiliary cylinder 12, and the three-position four-way directional valve 7 are all connected. The three-position four-way directional valve 7 is connected to the three-position four-way directional valve 10, the oil outlet of hydraulic pump 1, the oil tank 17, the rod chamber of boom cylinder 11, the rod chamber of boom cylinder 13, and the rod chamber of auxiliary cylinder 12. The engine 14 is coaxially connected to hydraulic pump 1. The overflow valve 2 is connected to the outlet of hydraulic pump 1 and the oil tank 15. The check valve 3 is connected to the oil inlet of hydraulic pump 1, the oil tank 15, and the throttle valve 16. The throttle valve 16 is connected to the energy storage unit 18.

[0019] In an embodiment, the energy storage unit 18 includes a two-position two-way reversing valve 4, a two-position two-way reversing valve 6, a two-position two-way reversing valve 9, an accumulator 5, and an accumulator 8. The accumulator 8 is connected to both the two-position two-way reversing valve 6 and the two-position two-way reversing valve 9, and the accumulator 5 is connected to both the two-position two-way reversing valve 4 and the two-position two-way reversing valve 6.

[0020] In this embodiment, the two-position two-way reversing valve 9 in the energy storage unit 18 is connected to the three-position four-way reversing valve 10, and the two-position two-way reversing valve 4 is connected to the throttle valve 16.

[0021] The boom potential energy recovery and reuse device and its working principle include:

[0022] When the boom descends, the three-position four-way directional valve 7 and the three-position four-way directional valve 10 are in the right position. The oil output by the hydraulic pump 1 flows through the three-position four-way directional valve 7 into the rod chamber of the boom cylinder 11, the rod chamber of the boom cylinder 13, and the rod chamber of the auxiliary cylinder 12. The pressure oil in the rodless chamber of the auxiliary cylinder 12 flows back to the oil tank 17. At this time, the two-position two-way directional valve 6 and the two-position two-way directional valve 9 are in the connected state, and the two-position two-way directional valve 4 is in the disconnected state. The pressure oil in the rodless chamber of the boom cylinder 11 and the rodless chamber of the boom cylinder 13 is fed into the accumulator 5 and the accumulator 8 to realize energy recovery.

[0023] When the boom rises, the three-position four-way directional valve 7 and the three-position four-way directional valve 10 are in the left position. The pressure oil output by the hydraulic pump 1 flows into the rodless chamber of the boom cylinder 11 and the rodless chamber of the boom cylinder 13 to drive the boom to rise. The oil in the rod chamber of the boom cylinder 11, the rod chamber of the boom cylinder 13, and the rod chamber of the auxiliary cylinder 12 flows back to the oil tank through the three-position four-way directional valve 7. At this time, the two-position two-way directional valve 5 and the two-position two-way directional valve 9 are in the connected state, and the two-position two-way directional valve 6 is in the disconnected state. The pressure oil in the accumulator 8 flows into the rodless chamber of the auxiliary cylinder 12 to assist the boom to rise. The pressure oil in the accumulator 5 flows into the oil inlet of the hydraulic pump 1 through the throttle valve 16 to reduce the output torque of the engine 14 and realize the release and reuse of energy.

Claims

1. A device for recovering and reusing the potential energy of an excavator boom based on a balance cylinder and its working principle, characterized in that: include: The system includes boom cylinder 11, boom cylinder 13, auxiliary cylinder 12, three-position four-way directional valve 7, three-position four-way directional valve 10, energy storage unit 18, check valve 3, relief valve 2, throttle valve 16, engine 14, hydraulic pump 1, oil tank 15, and oil tank 17. The rod chamber of auxiliary cylinder 12 is connected to the rod chambers of boom cylinder 11 and boom cylinder 13. The three-position four-way directional valve 10 is connected to the energy storage unit 18, the rodless chamber of boom cylinder 11, the rodless chamber of boom cylinder 13, and the auxiliary cylinder. The rodless chamber of cylinder 12 and the three-position four-way directional valve 7 are connected. The three-position four-way directional valve 7 is connected to the three-position four-way directional valve 10, the oil outlet of hydraulic pump 1, oil tank 17, the rod chamber of boom cylinder 11, the rod chamber of boom cylinder 13, and the rod chamber of auxiliary cylinder 12. The engine 14 is coaxially connected to hydraulic pump 1. The overflow valve 2 is connected to the outlet of hydraulic pump 1 and oil tank 15. The check valve 3 is connected to the oil inlet of hydraulic pump 1, oil tank 15, and throttle valve 16. The throttle valve 16 is connected to energy storage unit 18.

2. The device for recovering and reusing the potential energy of an excavator boom based on a balance cylinder and its working principle as described in claim 1, characterized in that: The energy storage unit 18 includes a two-position two-way reversing valve 4, a two-position two-way reversing valve 6, a two-position two-way reversing valve 9, an accumulator 5, and an accumulator 8. The accumulator 8 is connected to both the two-position two-way reversing valve 6 and the two-position two-way reversing valve 9, and the accumulator 5 is connected to both the two-position two-way reversing valve 4 and the two-position two-way reversing valve 6.

3. The device for recovering and reusing the potential energy of an excavator boom based on a balance cylinder, and its working principle, as described in claim 2, are characterized in that: In the energy storage unit 18, the two-position two-way reversing valve 9 is connected to the three-position four-way reversing valve 10, and the two-position two-way reversing valve 4 is connected to the throttle valve 16.

Images