SU150889A1 - Method for measuring the length of hot roll using a television device - Google Patents

Description

The known methods for measuring the length of a hot roll do not exclude errors resulting from changes in the thickness of the roll.

According to the proposed method, the measurement is carried out on a limited section of the roller table, where the end of the roll falls in the field of view of the lens. In this case, the length is measured from the point of intersection of the optical axis of the objective with the plane of the roller table to the point of intersection of the generator of the angle of view of the object with the plane of the roller table.

This method of measuring the length of a roll allows the elimination of errors due to the thickness of the roll.

The drawing shows a diagram explaining a method for measuring the length of a hot roll using a television device.

The television device was equipped with two TV-ion transmitting cameras / and 2 installed at a height I above the live rolls 3 hot rolling mills a distance from each other, slightly exceeding the maximum possible length of roll 4, the generator 5 mass pulses, sweep block 6, two selectors 7 and 5, the summing device 9 and the digital display 10.

The measurement circuit also includes four photo relays //, J2, 13, and 14, two of which are located along the edges of the measurement zone, and two in the middle of the measurement zone and in the base distance from each other, which is less than the minimum possible length of roll .

When the entire roll falls into the measurement zone, the boundaries of which are viewed by the photo relay and 14 and illuminated by the photo relays 12 and 13, actuators 15 and 16 are activated, which open the gates of the transmitting chambers (the executive mechanism triggers only the presence of impulses with photo relay 12 and 13 and no pulses with a photo relay 11 and 14).

No. 150889- 2 In this case, the image of the front and rear ends of the moving roll is projected through the lenses of the transmitting cameras on the photo layer of the transmitting television tubes operating in the single-line decomposition mode.

At any position of the roll in the measurement zone in the field of view of the transmitting chambers, the lower faces of the roll ends coincide with the plane of the roller table. As a result, the duration of the pulses taken from the transmitting tubes does not depend on the thickness of the roll. The drawing shows the rolls of different thickness (dotted lines), which have the same projection on the photo layer of the transmitting tubes.

The generator of pulsing pulses on a monoscope also operates in a single-line decomposition mode and is powered by the same scanner as the transmitting cameras. Signal p: astine monoscope has a striped structure.

As a result of a single-line scan of the beam intersecting the strips of the signal plate, the monoscope generates a series of g; common HMnyjibCOB for each period of the razzerty.

Each pulse of a monoscope, the scan of which is identical to the scan of the transmitting tubes, represents a certain increment in the length of the roll.

The scale pulses of the monoscope, together with the pulses taken from the transmitting tubes, enter the selectors 7 and 8 of the pulses. In selectors, the transmission tube pulses are used as the gate for the monoscope pulses (through the selector, the pulses that the monoscope generates during the pulse of the transmission tube pass through the selector).

The pulses preexisting through the selectors are summed for each sweep period with the base distance in the adder, and the output of which is set to a digital indicator of the length of the roll.

Subject invention

A method of measuring the length of a hot roll using a television device, which is characterized by the fact that, in order to eliminate errors due to the thickness of the roll, the measurement is carried out in a limited area of roller-nga, in which the end of the roll falls in the field of view of the lens. The lengths lead from the intersection point of the optical axis of the object to the roller plane to the intersection point of the generator of the angle of view of the objective with the roller table.