Power head of rotary-excavator

Abstract

The invention discloses a power head of a rotary-excavator. The power head of the rotary-excavator comprises a drill bit. The outer side of the drill bit is provided with an upper pressing plate. Thelower end face of the upper pressing plate is fixedly connected with one end of a spring. The other end of the spring is fixedly connected with a lower pressing plate. The lower end face of the lowerpressing plate is fixedly provided with a sleeve. The outer side of the sleeve is in welded connection with a fixing plate. The outer side of the drill bit is fixedly provided with a large gear. The upper end of the fixing plate is provided with a hydraulic motor. The power head of the rotary-excavator is capable of, through a mode of manual control, increasing a range of a rotation speed, reducing a speed in drilling and piling processes through enlarging the range, thereby increasing a twisting force in the drilling and piling processes, piling a harder stratum, and increasing a speed in a soil throwing process, thereby throwing out soil in the drill bit of the rotary-excavator better, wherein a transmission ratio between a small gear and the large gear is 1:1.3, greatly reducing a rotation speed of the small gear, and enabling a whole structure to be more simplified through an open-type installing structure.

Description

technical field [0001] The invention relates to the technical field of rotary excavators, in particular to a power head of a rotary excavator. Background technique [0002] The rotary excavator is used for drilling and piling on the ground. It must be used in construction. It uses the rotation of the drill bit to turn the mud and rocks into the inside of its own drill bit. After the inside is full, it is lifted to the ground to remove the inside When the mud and rocks are thrown out, the control of the drill bit speed of the rotary excavator needs to be controlled at different speeds in different time periods. When piling, a lower speed is required, so that there is more force for drilling, and when it comes out to throw soil In this case, a higher speed is required, so that the soil in the drill bit of the rotary excavator can be better thrown out. [0003] The power of today’s drill bits, that is, the power head, is driven by hydraulic output (such as Rexroth’s hydraulic ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a power head of a rotary excavator to solve the problem that the traditional automatic speed change of the power head proposed in the above background technology results in a small amplitude modulation, which cannot reach the highest or lowest limit value of the rotating speed, and the variable range is limited. It is easy to heat up and needs to be sealed

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