Epiroc (Nanjing) Construction and Mining Equipment Co., Ltd.

Chengyun Zhu

Jie Zhao

Ning Heng

Disclosed is a tower lifting device for a rotary blasthole drill, comprising a hydraulic cylinder (), an extending oil path (), a retracting oil path (), a speed control oil path () and a proximity switch (), wherein the extending oil path () is connected to a non-rod-end chamber of the hydraulic cylinder (), and an extension control unit is provided on the extending oil path (); the retracting oil path () is connected to a rod-end chamber of the hydraulic cylinder (), and a retraction control unit is provided on the retracting oil path (); the speed control oil path () is connected to the retracting oil path (), the speed control oil path () is connected to a speed control valve block () in series and the tail end thereof is connected to an oil tank (); the proximity switch () is arranged on a tower supporting frame () for controlling the switching on and off of the speed control valve block (), and when the tower () is approximately in a horizontal state, the speed control valve block () is on. By using such a tower lifting device in the present invention, the speed at which the tower is laid down to a horizontal state can be conveniently controlled.

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Jiangsu, China

Chengyun Zhu