SU440428A1 - Device for controlling the speed of movement of parts during their continuous-sequential heating - Google Patents

Description

one

The invention relates to devices for controlling the speed of movement of parts during their continuous-sequential heating.

A device for adjusting the speed of movement of parts with ph continuous-heating is known, which includes inlet and outlet trays and a rotary disk.

The aim of the invention is to eliminate undamped oscillations and increase the dynamic stability of the movement of parts.

For this, the device is provided with a braking device arranged in contact with heated parts, creating an increasing braking torque with increasing speed, for example, an AC motor operating in a braking mode in the linear portion of its braking performance, or with an excited load current due to own emf generator, or with a perturbed electromagnetic brake acting on the principle of eddy currents.

The invention is illustrated by the example of a continuous heating control system with an effect on the speed of movement, especially when large gain factors are needed to increase the control accuracy, putting the system into a dynamically unstable mode.

FIG. 1 shows a system for magnetoparametric automatic control of continuous-successive heating mode; in fig. 2 is a section along the line A-A in FIG. one; on

FIG. 3 - connection of an AC motor used as a corrective decelerating braking device. The system of magnetoparametric automatic regulation of the continuous heating mode, designed to heat steel parts, has a heating inductor 1, a pulling solenoids 2 creating a pulling magnetic field, and a chute device 3 that feeds the heated parts 4 to the input of the heating inductor 1 with minimal overcurrent of frictional forces slip. Tray device 3 consists of a supply tray o, freely rotating almost on a horizontal

the axles 6 of the disk carousel 7 with an annular groove 8 at the end for holding the parts 4 and the evacuation tray 9. The inlet 5 and the evacuating 9 trays are aligned with the annular groove 8 of the circular carousel 7 so that the parts 4 are free to move from the inlet tray 5 into the annular groove 8 and from the annular groove 8 into the discharge chute 9.

Axis 6 through the rim 10 of the disk carousel 7 (coupled due to the forces of friction sliding

4) through a belt drive, which additionally consists of a belt 11 and a pulley 12, is connected to an AC motor shaft 13. The asynchronous motor 13, which serves as a corrective decelerating braking device, is connected to the current source (see Fig. 3). The winding 14 of the motor 13 is connected to the alternating current source through the rectifier 15 and the adjusting resistance 16 so that the engine operates in the braking mode. The transfer from axis 6 of carousel 7 to the motor shaft 13 in the case of using an induction motor as a corrective decelerating braking device is selected from such a calculation that at the nominal speed of rotation of axis 6 of the carousel 7 the shaft of the induction motor 13 rotates at a low speed n in the approximate speed limits to ft с к where 5k - critical engine slip; Ps and Pk - synchronous and critical speed of the asynchronous motor in the normal mode of its work. In this case, an asynchronous motor, as is known, creates an approximately proportional braking torque with increasing speed. In case of using as a corrective decelerating brake device of an excited generator, which is loaded with current due to its own E.D.S., an increase in the braking moment with increasing speed can be ensured in a wider range of its low speeds. And changing the current, e.g., the excitation current of the corrective decelerating braking device, within certain limits, for example, by using resistance 16 or by varying the voltage of the power supply, allows you to simply change the braking torque and the braking force acting on the column of heated parts. As a result, the coordinate of the static balance of forces acting in the system on its electromechanical characteristic is shifted, due to which the controlled heat content at the outlet of the heater can also be changed within certain limits. The subject of the invention is a device for controlling the speed of movement of parts during their continuous-sequential heating, which contains supply and discharge trays and a rotary disk, characterized in that, in order to eliminate continuous oscillations and increase the dynamic stability of the movement of parts, it is equipped with a braking device located with possibility of contacting with heated parts.

Fig f

l

 ru