Straight grinding machine for steel bridge testing and with telescopic grinding heads

Abstract

The invention discloses a straight grinding machine for steel bridge testing and with telescopic grinding heads. The straight grinding machine comprises a straight grinding machine body, the straight grinding machine body comprises a rotary core bar, the coarse sand grinding head, the fine sand grinding head, a coarse sand grinding head core bar and a fine sand grinding head core bar. The rotary core bar sequentially passes through a coarse sand grinding head telescopic device, a coarse sand grinding head connector and the coarse sand grinding head core bar to be connected with the coarse sand grinding head. In addition, the rotary core bar sequentially passes through a fine sand grinding head telescopic device, a fine sand grinding head connector and the fine sand grinding head core bar to be connected with the fine sand grinding head. The straight grinding machine realizes the function that during grinding of the inner portion of a steel box girder, the grinding heads do not need to be replaced, achieves grinding on the two sides of a transverse partition plate on one side of an over weld hole 19, and improves the grinding efficiency and the maneuverability.

Description

technical field [0001] The invention belongs to the technical field of civil engineering, and in particular relates to a steel bridge test straight grinder with a retractable grinding head. Background technique [0002] In recent years, with the rapid economic development, many long-span steel box girder bridges have been built in my country. Due to the long-term alternating load, the steel box girder is prone to fatigue cracks at the weld joints. Some parts inside the steel box girder have complex structure and narrow space, such as the U-rib and the welding hole of the panel, which are prone to fatigue cracks. [0003] In order to study and repair fatigue cracks, the steel surface needs to be ground for further research. The commonly used grinding machine inside the steel box girder is a straight grinder, but the current straight grinder can only install one grinding head. The coarse sand grinding head needs to be replaced during the initial grinding, and the fine sand g...

AI Technical Summary

Problems solved by technology

The commonly used grinding machine inside the steel box girder is a straight grinder, but the current straight grinder can only install one grinding head. The coarse sand grinding head needs to be replaced during the initial grinding, and the fine sand grinding head is required for further grinding. It takes a long time to change the grinding head during the process; and the structure of the welding hole is complicated, and the cracks often span the welding hole, resulting in the need for grinding on both sides of the welding hole, and it is very inconvenient to grind inside the steel box girder. A ladder needs to be erected, and the two sides of the welding hole belong to different warehouses. In order to polish the same place, it is necessary to walk back and forth between the two warehouses, which is extremely unfavorable for operation

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