Wheels are an important part of double beam bridge cranes. The outer ring of the wheel tread, the shaft hole and the bearing hole are all machined. The control accuracy is directly related to the stability of the crane operating mechanism and the size of the noise.
In order to obtain higher machining accuracy, the double-beam bridge crane must correctly install the workpiece. Grinding wheel installation can adopt direct alignment method and fixture installation method. Directly align the installation, find the position of the workpiece directly on the machine tool with measuring tools such as a dial indicator, a scribe, and then clamp it. The direct alignment and installation accuracy of the four-jaw chuck lathe mainly depends on the worker's experience, technical level and the tools used. In addition, adjustment is very time-consuming and inefficient. Caliper installation is to install the caliper to a certain position on the machine tool, and fix the workpiece on the caliper without alignment.
Thus, the rapid, convenient, stable and reliable repeated positioning of the workpiece of the double-beam bridge crane is realized. The crane wheel is a general standard part, which is processed by fixture clamping, which has high processing efficiency and good precision control. Through reasonable installation methods and processing techniques, high-precision and high-quality grinding wheels can be processed. The good use of wheeled machining parts ensures the working mechanism of the double-beam bridge crane.
The function of the rail pressing plate is to fix the trajectory, which is also a common method for fixing the rails of double girder bridge cranes. However, if the double-beam bridge crane is in a high-speed, frequent or wheel pressure working environment, the existing fixing methods can no longer meet its performance requirements. At this time, the nut of the track pressure plate is easy to loosen, the track pressure plate falls off, and the rail plate bolt is broken. Once the rail pressure plate is loose, it will inevitably cause rail position movement, rail gnawing and other faults. This can also cause derailment.
In terms of control accuracy, the processing method of the double-beam bridge crane is also very important. Common processing methods include trial cutting method and adjustment method. The trial cutting method is to first try to cut a small part of the machined surface, then measure the size of the trial cut, make appropriate adjustments according to the processing requirements, and then try again. After two or three trial cuts and tests, the entire machined surface can be cut only after the machining dimensions meet the requirements. The adjustment method is to use the positioning device or the tool setting device on the machine tool or the pre-adjusted tool post to make the tool reach a certain position accuracy relative to the machine tool or fixture, and then perform batch processing.
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