Vibration damping type long tensioning device for mining machine and mining machine body three-section tensioning structure

Abstract

The invention relates to a vibration damping type long tensioning device for a mining machine and a mining machine body three-section tensioning structure. A first long screw and a second long screw in the long tensioning device are coaxially and fixedly connected through a threaded sleeve, one end of a vibration damper is fixed to the threaded sleeve, the other end of the vibration damper is a free end, and the design main vibration damping direction of the vibration damper is in the radial direction of the threaded sleeve; and the machine body three-section tensioning structure comprises a left traction part, a middle electric cabinet and a right traction part which are sequentially arranged adjacently from left to right to form a machine body, an installation groove with a downward groove opening and extending leftwards and rightwards is formed in the machine body, the left traction part and the right traction part serve as the left groove wall and the right groove wall of the installation groove respectively, in the installation state, the first long screw and the second long screw penetrate through a left through hole and a right through hole in the left groove wall and the right groove wall respectively and are fastened to the machine body through hydraulic nuts and round nuts, and the free end of the vibration damper is fixedly connected relative to the machine body. Thelong tensioning device does not fail due to early fatigue, is beneficial to reducing the overhaul and maintenance times, reduces the use cost and improves the connection reliability of the mining machine body.

Description

technical field [0001] The invention relates to a long tensioning device and a three-stage tensioning structure of a mining machine fuselage composed of the long tensioning device. The long tensioning device is mainly used on the connection between. Background technique [0002] There are generally 4 to 6 groups of tensioning devices in mining machines for underground mining, which are distributed around the fuselage. To prevent the cutting reaction force of the mining machine during the working process from causing the three sections of the fuselage to loosen and cause safety accidents. At present, each group of existing long tensioning devices includes a long screw rod with a length of 4m to 6m. The two ends of the long screw rod are threaded sections, which are tightened by means of hydraulic nuts, etc., and the middle of the long screw rod is almost suspended. [0003] When the mining machine mines ore in the fully mechanized mining face, the cutting reaction force bor...

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Problems solved by technology

[0003] When the mining machine mines ore in the fully mechanized mining face, the cutting reaction force borne by the cutting drum of the mining machine is transmitted to the body of the mining machine. Due to the change of the geological conditions of the mine layer, the cutting reaction force often appears as an impact load. For the machine In itself, it is the source of shock vibration. At the same time, when the mining machine is running on the pin row of the scraper machine, it will also form a vibration source. Resonance, the vibration amplitude is the largest in the middle of the long screw, which makes the long screw fatigue and fracture in the early stage of use, which cannot reach the design life of the long tensioning device

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