SU120880A1 - Installation for electric heating rod blanks by the method of resistance - Google Patents

Description

The main disadvantage of the known devices for the contact heating of bar blanks by the method of resisting is the cooling down of the ends of the product.

The proposed installation eliminates chilling of the ends and provides a uniform temperature over the entire length of the workpiece by applying a combined heating.

This is achieved due to the fact that the installation uses separate transformers for the longitudinal heating of the workpiece and transverse heating of its ends, the secondary windings of which are combined into a single circuit, eliminating the need to open the contacts under high voltage.

The installation consists of an electrical heating part of a mechanical power-discharging device.

FIG. 1 shows a diagram of the combined heating of bar blanks; in fig. 2-diagram of the installation for electric heating rod blanks with power-reset device.

The heating part of the installation (Fig. 1), besides the transformer / dl for the main longitudinal heating of the workpiece, has two additional transformers 2 for the transverse heating of the ends. The secondary winding of the transverse heating transformer 2, consisting of one coil, is a jumper between the upper and the lower contacts. With the transformer / longitudinal heating disconnected, the transverse heating transformers 2 are automatically turned on, which bring the temperature of the workpiece under the contacts to the temperature of the middle section. The secondary voltage of the transformer 2 is transverse heating 1.5-2 volts. At such voltages, the break of the contacts without relieving the voltage proceeds without arcing.

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The operating time of transformers 1 and 2 can overlap in time and can be reduced to almost the operating time of the transformer / longitudinal heating.

The installation is intended to heat a bar material with a length of 600 mm and a diameter of 10-15 mm to a forging or rolling temperature.

The installation consists of four independent heating posts, each of which contains a power-discharge device. Coordinates the work of the installation of the controller, driven by a separate electric motor; temperature is controlled by photoelectric pyrometers.

The power-dropping device (Fig. 2) consists of the following components: a hopper 3 with a supply of blanks for continuous operation for 30 minutes, a feeder 4 moving from a pneumatic cylinder 5 and a spring-loaded lever 6 that holds the workpiece from rolling, a dumper 7 of blanks, spring loaded a flat spring 8, a current-carrying vice 9, clamping the workpiece by the ends, the clip of which moves in a vertical plane, and the conveyor 10, which is arranged parallel to the heated workpiece.

Feeding-dropping device operates as follows.

Feeder 4 transfers the workpiece into the current-carrying vice 9 and with the same stroke pushes the previous (heated) workpiece 7 onto the conveyor 10 with the ejector 7. During the return stroke of the feeder 4, the resetter 7 is deflected by the workpiece clamped in the current-carrying vice 9. on a tray or directly to forging or rolling equipment.

Subject invention

Claims (2)

1. Installation for electrical heating of bar blanks by the method of resistance, which, in order to ensure uniform temperature along the entire length of the blank, uses separate transformers for longitudinal heating of the blank and transverse heating of its ends, the secondary windings of which are combined into a single a circuit that eliminates the need to open the contacts under high voltage. 2. Installation under item I, characterized in that, in order to supply the blanks to the current-carrying vise and dump the heated billet from the vice to the discharge conveyor, a feed dispenser is used in it, in front of which there is a fold-away dumper of the workpiece.