The invention discloses an arc height protection device. The device comprises a
machine tool, a bottom plate fixedly arranged on the surface of the
machine tool, a strong magnetic limiting plate located at the upper end of the bottom plate, a hinge device fixedly arranged together with the strong magnetic limiting plate, a contact rod connected with the hinge device, an
alarm device, a PLC control panel and a power supply; a strong
magnet is embedded in the strong magnetic limiting plate; one end of the contact rod is provided with a magnetic rod, and the other end of the contact rod is provided with a conductive rod; the magnetic rod and the strong
magnet are magnetically attracted; the conductive rod is fixedly arranged together with the hinge device; the free end of the conductive rod extends out of the edge of the strong magnetic limiting plate; the hinge device is provided with a conductive contact; and the conductive contact is connected with the PLC control panel, the
alarm device, the power supply and the
machine tool through wires. According to the invention, in the paying-off process of the steel cord internal paying-off stranding
machine tool, when the arc height of a steel cord is too large, the
machine tool can give an alarm and stop in time, the phenomena of
wire breakage and
rope breakage of the steel cord are avoided, the product quality of the steel cord is ensured, and the loss is reduced.