Energy-saving excavator

Abstract

An energy-saving excavator includes a slideway, a counterweight iron, a first pulley, a main arm, a main arm axle pin, a support, a parabolic-shaped tower groove, a second pulley and a transmission rope; the counterweight iron is slidably connected to a body of the excavator through the slideway, the first pulley is mounted on an upper end of the slideway, the main arm is fixed to the parabolic-shaped tower groove and is rotatably connected to the body of the excavator through the main arm axle pin, one end of the transmission rope is fixed to the counterweight iron, the transmission rope goes around the first pulley and in turn the second pulley, another end is connected to the parabolic-shaped tower groove, and the first pulley is connected to the axle pin of the main arm through the support.

What is claimed is: 
     
         1 . An energy-saving excavator, comprising: a slideway, a counterweight iron, a first pulley, a main arm, an axle pin of the main arm, a support, a parabolic-shaped tower groove, a second pulley and a transmission rope; wherein the counterweight iron is slidably connected to a body of the excavator through the slideway, the first pulley is mounted on an upper end of the slideway, the main arm is fixed to the parabolic-shaped tower groove and is rotatably connected to the body of the excavator through the axle pin of the main arm, one end of the transmission rope is fixed to the counterweight iron, the transmission rope goes around the first pulley and in turn the second pulley, another end is connected to the parabolic-shaped tower groove, and the first pulley is connected to the axle pin of the main arm through the support. 
     
     
         2 . The energy-saving excavator according to  claim 1 , wherein two main arm cylinders are attached between the main arm and the body of the excavator. 
     
     
         3 . The energy-saving excavator according to  claim 2 , wherein a counterweight iron cylinder is connected to the counterweight iron, and the counterweight iron cylinder is connected to an oil circuit of one of the main arm cylinders.