Series hybrid power system for excavator boom

Abstract

The invention discloses a series hybrid power system for an excavator boom. An output shaft of a prime motor is connected with a transmission shaft of a hydraulic pump, a port S and a port P of the hydraulic pump are respectively connected with an oil tank and a port A of a first one-way valve, a port B of the first one-way valve is respectively connected with the port P of a hydraulic motor and the port B of a second one-way valve, and a port T of the hydraulic motor and the port A of the second one-way valve both are connected with the oil tank; the hydraulic pump is connected with a transmission shaft at one end of a flywheel through a one-way clutch, a first transmission and a first clutch, and the transmission shaft at the other end of the flywheel is connected with the transmission shaft of the hydraulic pump / motor through a second clutch and a second transmission; the port S and the port P of the hydraulic pump / motor are respectively connected with the oil tank and the port P ofa main reversing valve, the port A and the port B of the main reversing valve are respectively connected with a rod cavity and a rodless cavity of a boom hydraulic cylinder, and the port A and the port B of a third one-way valve are respectively connected with the oil tank and the rod cavity of the boom hydraulic cylinder. The system provided by the invention can recycle energy of the boom, and also can perform efficient reuse of the energy.

Description

technical field [0001] The invention belongs to the technical field of hydraulic transmission, and in particular relates to a serial hybrid power system for excavator arms. Background technique [0002] Hydraulic excavators are widely used in various construction fields. Hydraulic excavators have disadvantages such as high fuel consumption and low efficiency. Research on energy saving is imminent. [0003] figure 1 It is a structural schematic diagram of a common excavator arm system at present. Wherein, the end of the boom 100 is hinged on the turntable 200 , the cylinder barrel of the boom hydraulic cylinder 4 is hinged on the turntable 200 , and the piston rod end of the boom hydraulic cylinder 4 is hinged on the middle part of the boom 100 . When the piston rod of the boom hydraulic cylinder 4 performs telescopic movement, the boom 100 can be driven to lift and lower. During the working process of the excavator, the boom lifts frequently, and due to the large mass of ...

AI Technical Summary

Problems solved by technology

The hydraulic recovery scheme takes advantage of the accumulator’s high power density and the ability to absorb pressure shocks. However, due to the low density of energy stored in the accumulator, if more energy needs to be stored, a larger accumulator will be required, which in turn will Occupies a large space, and the installation of the accumulator is also very inconvenient

In addition, the pressure of the accumulator will rise with the increase of the stored oil, which will affect the falling speed of the boom

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