Is it necessary to stop the machine when measuring the roundness of the plate rolling machine?

When measuring the roundness of the workpiece processed by the plate rolling machine, the safety operating procedures must be strictly followed and the equipment must be completely stopped. If the operator needs to use a template or other detection tools to verify the curvature of the workpiece during the rolling process, the active wheel of the plate rolling machine must be completely stopped first, and the measurement can be carried out close to the surface of the workpiece after the inertial motion of the roller is completely eliminated. This requirement stems from the multiple risks of dynamic measurement: the contact area between the running roller and the steel plate is prone to form a shear danger zone, the high-speed rotating parts may cause the detection tool to splash, and the workpiece that has not stopped is prone to position deviation due to the release of residual stress, affecting the measurement accuracy.

For traditional mechanical plate rolling machines, the roundness detection needs to be completed by manually holding the template and matching it with the workpiece surface after the machine is stopped. When measuring, it is necessary to reserve a 5%-10% margin at the end of the workpiece to prevent the template from slipping due to elastic rebound. In special working conditions, if a large-diameter cylinder (diameter ≥ 3 meters) is encountered, it is also necessary to use a magnetic hanger to fix the workpiece to avoid safety accidents caused by the rolling of the cylinder. The intelligent plate rolling machine with optical monitoring system can realize non-contact online monitoring through CCD curvature sensor and laser displacement sensor. At this time, data can be collected in real time under low-speed operation, but the system still needs to suspend the roller movement during the data correction stage to perform parameter adjustment.

Regardless of the detection method used, the operator must ensure that the body parts are away from the roller working area and no moving parts are allowed to be touched during the measurement. For hydraulically driven plate rolling machines, it is also necessary to confirm that the hydraulic system has been depressurized to prevent accidental contact with the control switch causing the roller to move unexpectedly. Historical accident analysis shows that about 63% of plate rolling injury accidents are caused by illegal operations without stopping the machine for inspection, highlighting the necessity of stopping the machine for inspection.