Science & technology information technological information 2019 no. 02sconice & technology information industry doi:10. 16661/j. Cnki. 1672-3791. 2019. 02. 117 studying the qinxiang quan (shanghai zhenghua heavy industries (gross group) co. Ltd. 201913) qing: the issue of graftation of bridge-based cranes has always been a matter of greater corporate concern, the reasons for which must be carefully analysed and positive measures must be taken to eliminate it as soon as possible and to ensure the proper functioning of the crane. The paper summarizes the diagnosis of the problem of trajectories on the bridge in practice, the hazards of trajectories, and analyses the causes of the trajectories and proposes methods of repair. The bridge-gate cranes are orbiting machines, and normally, in ideal condition, all wheels of the machine should be fully rolling. Its rotational edge should not be in contact with the orbit so as to ensure that all steering wheels are friction-guided, at which point the crane's wheels and orbits are minimally worn and without additional operational resistance. In operational applications, however, it is not fully guaranteed to operate in the desired state, and it is often the case that there are gnawings. The reasons for this are diverse and complex and will be addressed in the following areas. Keywords: onshore bridge cranes, large and small car wheels catalogue number: th215 bibliography number: article no. A: 1672-3791 (2019) 01 (b)-0117-021 hydraulic cranes, also known as motor vehicles, in long-term use, with different degrees of large-sized vehicle gnawing. There are serious consequences due to heavy car chewing: distortion and change in shape of the main beam of the crane; acceleration of the degree of orbital wear and wear, affecting the useful life of the orbit; reduction of the useful life of the wheel; increased resistance to operation and even the burning of electrical motors; damage to the structure of the plant; and de-orbiting accidents. Increased maintenance overhaul workload, spare parts consumption and equipment maintenance overhaul costs affect normal stability, safety and economic production. When a bridge crane chews its tracks, it is necessary to exercise strict control over the exits from the design, manufacture, installation, maintenance and repair of the vehicle to ensure the proper functioning of the used vehicle, to reduce equipment accidents, failure rates and equipment maintenance and repair costs and to ensure stable, safe and economical production. 2 reason analysis and solution 2. 1 the primary causes of this trajectories, which are caused by deviations in wheel position, are the pattern bias, linear deviations in wheeling, deviations in wheel-to-angle lines and deviations in wheel spacing. When the wheel is slashed, there is an angle in horizontal direction between the centre of the wheel orbital and the centre of the pedal, and the thrust that drives the wheel can be broken into a vertically orbital peace in orbit, resulting in a horizontal slide of the body and a cycling orbit. Usually, when the crane moves in one direction, the wheel edges chew one side of the orbit, and when the wheel turns, the same wheel chews on the other side of the orbit. When this occurs, it is necessary to measure the slant deviation and, when specific data are available, add a gasket between the axle bearings of the wheel and the end beams to adjust. The same can happen when there is a linear deviation from the wheel, a deviation from the wheel to the angle, and a deviation from the wheel distance. Linear deviations usually occur on the side of two wheels in the same orbit, one on the outside side and the other on the inside side; when there is a deviation on the side of the wheel, the two tracks are chewed on both the inside and the outside side; and when there is a deviation on the side of the wheel, it is usually on the inside side of the wheel, which is larger, and on the outer side, which is smaller. When these events occur, adjustments are made when data are available for timely measurement, and when deviations are small, the spacing of the bearings of the wheel can be reduced on the one hand and the length of the bearings on the other can be increased accordingly; when deviations are greater, the installed bolt holes in the bearings on the beams can be expanded and the moving positioning keys can be adjusted for deviations. 2. 2 the main reasons for this orbital chewing, which is caused by installation defects in orbits, are orbital linear deviations, orbital-species deviations and relative high-platform deviations, which often occur in fixed areas. When the linear deviation of the orbit and the orbital range are small, the bolt can be adjusted by an appropriate adjustment of the pressurer; when the deviation is too large, the orbit can only be re-installed. In the case of a relatively high deviation, improvements can be made by a side-lined steel plate under a low-side orbit, and the thickness of the plate can be determined by the size of the deviation. 2. 3 the gnawing orbit caused by the moving system is characterized by a spraining of the car when it is activated or parked. Most of this is due to wear and tear of parts, such as brakes, figure 1 high comparison of orbital markers (seconded 120 pages)
