Limiting device and limiting method of lifting and pushing mechanism of mining excavator

Abstract

The invention discloses a limiting device of a lifting and pushing mechanism of a mine excavator, which comprises a programmable controller, a human-machine interface, a lifting absolute value coder and a pushing absolute value coder. The limiting device is characterized in that the lifting absolute value coder is connected with a lifting mechanism coiling block through a flexible shaft; the pushing absolute value coder is connected with a shaft of a pushing speed reducer through a flexible shaft; signals of the absolute value coders are connected to a position detection module of the programmable controller through a shielding cable; a central processing unit of the programmable controller reads the signals of the coders in real time through the position detection module; signal values of the signals are compared with a numerical value set by a touch screen to obtain numerical values of different limit points; and the given numerical values of a frequency converter are controlled by using the numerical values of the different limit points so that a lifting and pushing motor is controlled and lifting and pushing limit and pre-limit are controlled. According to the limiting device,the limit is accurate, a mechanical mechanism is protected, operation and control properties are improved, and urgent needs of a large excavator are met.

Description

technical field [0001] The invention belongs to an electric control system of a mining excavator, and relates to a limit device of a lifting and pushing mechanism of the mining excavator. Background technique [0002] At present, mining excavators are mainly used for mining in open-pit mines. The excavators vibrate greatly when they are working. The lifting and pushing mechanisms of domestic excavators WK-4 and WK-10 are not equipped with electrical limit devices. The hoisting mechanism of the excavator has no limit, and there are often phenomena such as collision with the sky wheel or excessive lifting and falling, and the hoisting rope falling out of the groove; The finale is broken, which affects the life of the equipment mechanism. In addition, in order to meet the excavation process requirements of large excavators, it is necessary to set multiple pre-limits. Using collision limit switches requires a large number and is very inconvenient to install. Using traditional r...

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Problems solved by technology

[0002] At present, mining excavators are mainly used for mining in open-pit mines. The excavators vibrate greatly when they work. The lifting and pushing mechanisms of domestic excavators WK-4 and WK-10 are not equipped with electrical limit devices. The hoisting mechanism of the excavator has no limit, and there are often phenomena such as collision with the sky wheel or excessive lifting and lowering, and the hoisting rope falling out of the groove; The finale is broken, which affects the life of the equipment mechanism

In addition, in order to meet the excavation process requirements of large excavators, it is necessary to set multiple pre-limits. Using collision limit switches requires a large number and is very inconvenient to install. Using traditional rotation limit switches, due to the different sizes of buckets, the limit different points, the adjustment is very difficult, and the accuracy cannot meet the requirements. Large excavators urgently need an effective limit

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