Hybrid-driven mechanical mining excavator

Abstract

The invention discloses a hybrid-driven mechanical mining excavator. The hybrid-driven mechanical mining excavator comprises three kinetic potential storage and transportation circuit and motor combination drive systems, supercapacitor sets and controllers. Potential energy of a working device in the descending process and kinetic energy in travelling brake are recycled to be used for combination driving of the mechanical mining excavator. The hybrid-driven mechanical mining excavator disclosed by the invention has the advantages of being high in working efficiency, small in throttling loss, low in energy loss and the like.

Description

technical field [0001] The invention belongs to the field of large-scale equipment for open-pit mining, and in particular relates to a hybrid-driven mechanical mining excavator. Background technique [0002] Large-scale mechanical mining excavator (also known as electric shovel) is one of the essential key equipment in the intermittent mining process and semi-continuous mining process system of open-pit mines. It has large bucket capacity, wide operating range, strong environmental adaptability, It has the advantages of being able to withstand large vibration and shock loads, high working reliability and low maintenance costs. In order to meet the instantaneous high power demand of each actuator in the operation of the electric shovel, the lifting motor, pushing motor, and traveling motor of the electric shovel are all equipped with motors according to the required peak power. On the one hand, the volume of the motor is increased, and the power The difficulty of the overall...

AI Technical Summary

Problems solved by technology

In addition, according to the working characteristics of the electric shovel, the above-mentioned motors are often in low-speed and high-torque operating conditions. Due to the constraints of the current motor output torque, it is necessary to add a reducer to realize this function, which further increases the overall volume of these motors. In addition, there are problems such as large starting current and serious heating in the lifting motor, pushing motor and traveling motor of the electric shovel, especially when the bucket is lowered and the traveling device is braked, the motor is in the generator state, usually By setting the braking resistor, the kinetic energy of the electric shovel and the potential energy of the bucket are converted into heat energy and consumed, which will cause large energy consumption and cause the motor to heat up

In order to meet the short-term peak power demand, it is necessary to configure the installed power of the motor according to the maximum starting load, so that the motor works in the low-efficiency working area for a long time, resulting in a large energy loss, and the excessive starting current will also cause damage to the power grid. shock and impact

In order to recycle the potential energy when the bucket is lowered, the existing method is to feed back the electric energy generated by the motor to the main grid through the inverter. This method will have an impact on the grid and cause large fluctuations, affecting the safe operation of other electrical equipment.

[0003] A Chinese invention patent with the publication number CN101457537A discloses a large-scale mining excavator AC frequency conversion speed control device and its control system. The energy regeneration type public DC bus is used to realize the frequency conversion speed control of the mining excavator, which overcomes the existing The DC speed control system of large excavators has technical difficulties such as easy failure, poor reliability and low production efficiency, and can feed back the electric energy generated by the motor during braking to the grid, but it will cause impact and fluctuations in the grid voltage

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