With the advancement of small crane technology, the lifting range is continuously expanding, which leads to increasingly stringent technical requirements. As lifting equipment improves in capacity, the development trend of lifting technology is moving closer to integrated lifting solutions, which are now widely applied in large-scale lifting projects.
To assess the condition of a misaligned area, it's essential to measure the diameter on both sides and record the yaw data. By subtracting the yaw value at the maximum yaw position from the abrasion value at the minimum diameter, you can determine the actual amount of wear. For example, if the minimum diameter is 0.40 mm and the maximum yaw is 0.30 mm, the actual abrasion would be 0.10 mm. If this value is too low, grinding may cause burning and result in scrap. In such cases, it's recommended to use a guillotine knife to cut out the most severe and biased symmetrical points before grinding, then measure the damaged section. If the measured diameter minus the tool mark diameter is less than 0.20 mm, it’s advisable to seek approval before proceeding with grinding.
Small crane hoisting technology typically falls into two categories: split hoisting and integral hoisting. Operators must evaluate whether grinding is feasible based on parameters like workpiece bending, yaw, misalignment, and the depth of tool marks. For areas where the grinding amount does not exceed 0.50 mm, careful measurement of yaw, bending, misalignment, and tool marks is necessary. If the grinding amount is below 0.20 mm, it’s important to get approval from the responsible person before starting the process. If the yaw or bending exceeds one-third of the grinding area, the part should be straightened first before grinding.
In special situations, protective devices for small cranes should include additional safety measures such as barriers, isolation, sealing, absorption, or shielding against electricity, fire, explosives, high temperatures, vibrations, dust, smoke, radiation, and noise. These measures help prevent any part of the body from entering the danger zone or coming into contact with moving parts. They also protect against flying objects, accidental ejection of high-pressure liquids, and potential injuries such as burns or chemical corrosion. Furthermore, they ensure that mechanical components, fragments, or debris are contained to avoid harm caused by throwing, dropping, or launching.
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