The controller introduces the composition of its hardware circuit and compiles the corresponding software. Through the installation and debugging proof, the developed controller can automatically record the number of thermal fatigue tests, can resist the interference of the intermediate frequency induction heating power supply, and is reliable in operation and can be applied to surfacing welding. Hot rolling conveyor rolls on a thermal fatigue tester. In order to improve the service life of the hot rolling conveying roller, a heat-resistant and wear-resistant material is deposited on the surface of the conveying roller, which is called a surfacing hot rolling conveying roller. In the process of conveying the hot rolled billet, the conveying roller can reach a temperature of 70 ° C or higher and a minimum temperature of 10 ° C or less. Thermal fatigue occurs due to repeated changes in the temperature of the conveying roller and different materials inside and outside.
At present, there is no domestic testing machine suitable for testing the thermal fatigue of such a conveyor roller. Therefore, the development of a testing machine for the thermal fatigue test of such a transfer roller has important engineering significance. The developed thermal fatigue testing machine includes a mechanical part and a control part. On the basis of a brief introduction to the principle of the mechanical part, the development of the controller is emphasized. The mechanical part principle selects the medium frequency induction power supply heating and the jet water cooling method. The heating coil, the intermediate frequency transformer and the cooler are rigidly connected together to move along the fixed slide. The air cylinder is fixed on the slide rail to control the overall left and right movement, and the heating and cooling of the conveying roller are repeated.
During heating, the heating coil and the intermediate frequency transformer in the whole are driven by the motor to move left and right along the conveying roller, and automatically change direction after hitting the limit switches l and 2 to achieve uniform heating of the conveying roller. The conveying roller rotates around the axis, and the non-contact temperature sensor reciprocates along the axial direction of the conveying roller. When the sensor hits the normally closed contact, the sensor moves in the reverse direction and detects the temperature of the conveying roller.
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