Telescopic sleeve hydraulic cylinder unloading device of mining dump vehicle

Abstract

The invention provides a telescopic sleeve hydraulic cylinder unloading device of a mining dump vehicle. The telescopic sleeve hydraulic cylinder unloading device comprises a hydraulic cylinder piston, a tail level cylinder barrel, a guiding sleeve and a tail level piston rod. An unloading device body is arranged on the hydraulic cylinder piston and is arranged in the moving direction of the hydraulic cylinder piston. According to the unloading device body, the hydraulic cylinder piston is provided with a penetrating hole in the hydraulic cylinder piston moving device, the penetrating hole is internally provided with a guiding pin shaft, and the part, at the tail end of the penetrating hole, of the guiding pin shaft is provided with a dovetail cone. The guiding pin shaft penetrates out of the penetrating hole and is sleeved with a spring. The spring is externally provided with a spring base. Outside the spring base, the guiding pin shaft is fixed through a nut. When the telescopic sleeve hydraulic cylinder unloading device is used and an oil cylinder is elevated to the highest point, the unloading device body on the hydraulic cylinder piston makes contact with the guiding sleeve, an unloading valve is opened to make oil liquid in a rodless cavity enter a rod cavity, the unloading function is finished, and the oil cylinder is prevented from suffering from ultrahigh pressure no longer.

Description

technical field [0001] The invention relates to a telescopic sleeve hydraulic cylinder of a mining dump truck, in particular, an unloading device is arranged inside the oil cylinder, which has an unloading function when the oil cylinder is lifted to the highest point. Background technique [0002] At present, the structure of the mining dump truck cylinder is roughly divided into two types, one is a multi-stage double-acting cylinder, and the other is a final-stage double-acting cylinder. Since the dump truck oil cylinder can fall by the weight of the large box, the structure commonly used in the market is the final double-acting form. [0003] Such as figure 1 As shown, the conventional last-stage double-acting telescopic sleeve hydraulic cylinder is composed of a hydraulic cylinder piston 1, a final cylinder barrel 4, a guide sleeve 7, and a final piston rod 8. Compared with ordinary dump trucks, mining dump trucks are loaded more and have higher pressure. Due to structu...

AI Technical Summary

Problems solved by technology

Compared with ordinary dump trucks, mining dump trucks are loaded more and have higher pressure. Due to structural limitations, the limit device cannot be used to protect the oil cylinder.

When the oil cylinder is lifted to the highest position, the oil cylinder itself cannot be unloaded, and the continuous pressurization causes the internal pressure of the oil cylinder to rise suddenly, resulting in the deformation of the oil cylinder and even the bottom of the oil cylinder falling off, resulting in serious quality and safety accidents

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