With the advancement of small crane technology, the lifting range has been continuously expanding, which leads to increasingly stringent technical requirements for these cranes. As lifting equipment becomes more powerful, the trend in lifting technology is moving toward larger-scale, integrated operations that are now commonly applied in major lifting projects.
To assess the wear at a misaligned position, it's important to measure the diameter on both sides and the yaw data. By subtracting the yaw value at the maximum yaw point from the abrasion value at the minimum diameter, you can determine the actual amount of wear. For instance, if the minimum diameter is 0.40 mm and the maximum yaw is 0.30 mm, the actual wear would be 0.10 mm. If this value is too low, grinding could cause burning and result in scrap. In deep knife marks, it's advisable to use a guillotine knife to remove the most damaged symmetrical point before grinding, then measure the affected area. If the measured diameter minus the tool mark diameter is less than 0.20 mm, grinding should only proceed after obtaining approval.
Small crane hoisting technology is typically divided into two modes: split hoisting and integral hoisting. Operators must be able to evaluate whether grinding is feasible based on factors such as workpiece bending, yaw, misalignment, and the depth of tool marks. For areas where the grinding amount is less than 0.50 mm, careful measurement of yaw, bending, misalignment, and tool marks is essential. If the grinding amount is below 0.20 mm, permission from the responsible party should be obtained before proceeding. 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 must also 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 features ensure that no part of the body can enter the danger zone or come into contact with moving parts. They also prevent objects from flying out, accidental ejection of high-pressure liquids, or potential burns and corrosion. Additionally, they help contain any damage caused by mechanical throwing, dropping, or launching of parts and their fragments.
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