SU582218A1 - Device for detecting and marking glass defects - Google Patents

Description

The invention relates to devices used to control the quality of glass, and can be used to automatically detect and mark local defects in glass on flow lines.

A device for detecting and marking glass defects is known, which contains a transmitting television tube equipped with a frame format converter made of optical fibers, a source of illumination and a computer 1 connected to a television camera.

Another device is known, comprising a glass conveyor with a light source, a glass speed sensor, a delay element and a marking head 2.

- The known devices have a low reliability of the scanning system, their construction is complicated, and control at elevated glass speeds on the conveyor is impossible.

The aim of the invention is to improve the reliability of the device.

This goal is achieved in that a known device comprising a conveyor and glass with a light source, a glass speed sensor, a delay element and a marking head are inserted into a sawtooth generator, a shift register, a trigger, a logic element AND, a photoelectric converter, differentiating circuit, amplifier-driver and power amplifier, the glass speed sensor connected to one of the register inputs

shift, with the input of the sawtooth generator and through the delay element with one of their trigger inputs, the output of which is connected to one of the inputs of the logic element And, the output of the sawtooth generator

SoilTiney voltages with a photoelectric converter input and a differential value input, the output of which is connected, to another trigger input, the output of which is connected to one of the 1 logical input And, the other input of which is connected to the photoelectric converter output, and the output of the logic element And connected to another input of the shift register, the output of which

through the power amplifier connected to the marking head.

FIG. 1 shows a structural electrical circuit of the device; in fig. 2 oscillograms of voltages that work

devices.

A device for detecting glass defects contains a conveyor 1 for moving glass 2, a source of illumination 3 located above or below glass and creating a uniform light flux 4, a single-line photoelectric converter 5, the input of which is connected to the output of the sawtooth generator 6 and the input of the differentiating chain 7, the output of which is connected to the input of the trigger 8. The output of the speed sensor 9 is connected to the input of the generator 6, to the delay element 10 and the clock input of the shift register 11, the output of the delay element 10 is connected to trigger trigger 8, the output of which is connected to one input of the logic element And 12, and the other input of which through the amplifier-driver 13 is connected to the photoelectric converter 5. The output of the element 12 is connected to the information input of the shift register 11, the output of which through the power amplifier 14 is connected to the marking head -15.

The converter has a light-tight housing, mostly rectangular in shape, and its photosensitive surface (pupil) faces the glass ribbon in such a way that it perceives the light flux from the light source 3 and has a smaller size in the direction of the glass ribbon movement than perpendicular to its movement.

As an amplifier -former 13, a circuit with two RC differentiating chains or diffraction transformers with input and output amplifier stages is applied.

The speed sensor 9 may be made in the form of a wheel freely rolling on glass, kinematically associated with a slotted disk, on both sides of which there is an illumination lamp and a photocell. When the glass moves along the conveyor, the speed sensor generates a continuous sequence of pulses.

The marking head is a jet driven by an electric pulse, and is located behind the phototransducer in the direction of the glass ribbon. The remaining elements are standard.

This device can control a strip of glass equal in width to the length of the pupil. In order to monitor a glass of a larger width, these devices are dialed into a system with photo sensors arranged one to another across the entire width of the glass, while the speed sensor 9 and generator 6 serve the entire system.

The operation of the device is as follows.

A uniform luminous flux 4 from source 3 passes through two or more controlled glass 2 along a conveyor 1, is modulated by heterogeneity of glass and hits the photosensitive surface of a single-line photoelectric converter 5.

Simultaneously with this speed sensor 9, synchro pulses are produced (Fig. 2, a), whose frequency is proportional to the speed of movement of the glass ribbon. These pulses trigger the sawtooth voltage generator (FPG) 6, which carries out electronic

scan photoelectric converter 5.

In the absence of a defect, the signal from the output of the converter 5 is similar to the input

(Fig. 2.62) and the output of the amplifier maker 13, where amplification and double differentiation occurs, receive a signal (Fig. 2.6) corresponding to a zero level.

This signal arrives at one of the inputs of the D | vuh, the input of the logical element 12, without causing the marking head 15 to operate.

When a defect intersects a light flux 4, the latter is modulated and, falling on the photosensitive surface of a single-line photoelectric converter 5, produces a signal whose shape has a form similar to that of a signal. 2.6. This

the signal is amplified and differentiated twice by the amplifier driver 13 and, from the output of the latter, is fed to one of the inputs of the element 12.

At the same time, the delayed scheme

10, the clock pulse (Fig. 2, d) is applied to trigger trigger 8. The trigger is reset by a pulse (Fig. 2, c), which coincides with the beginning of the return stroke of the polling pulse (Fig. 2.6) and is formed from the polling pulse

by differentiation in the circuit 7. The output of the trigger 8 produces a strobe pulse (Fig. 2, (E), which is fed to another input of the And 12 element. When the input signals coincide (Fig. 2, e and Fig. 2, g)

The output of the element 12 is produced by the impulse of the defect (Fig. 2, h). This pulse is applied to the information input of the multi-bit signal register 11 and is recorded in its first bit. The shift pulses to the register come from the speed sensor 9, which acts as a synchronizer. Each pulse provides the transfer of information about the defect to the subsequent register register.

Thus, information is delayed and stored for the duration of the defect from the photoconverter 5 to the marking head 15. Power amplifier 14 ensures that the marking head 15 operates from the pulses of the shift register 11. The number of register bits equals the ratio of the photoelectric converter to the marking head to the diameter labels that the marking head places on the glass surface in the immediate vicinity of the defect.

Claims (2)

Invention Formula A device for detecting and marking glass defects containing a glass movement conveyor with a light source, a glass speed sensor, a delay element and a marking head, characterized in that, in order to increase the reliability of the device, it is equipped with a sawtooth generator, shift register, trigger And, a photoelectric converter, a differentiating circuit, an amplifier forformer and a power amplifier, the glass speed sensor connected to one and From the inputs of the shift register, with the input of the sawtooth generator and through the delay element with one of the trigger inputs, the output of which is connected to one of the inputs of the logic element I, the output of the sawtooth voltage generator is connected to the input of the photoelectric converter and the input of the differentiating circuit, output which is connected to another input of the trigger, the output of which is connected to one of the inputs of the logic element And, the other input of which through the amplifier-shaper is connected to the output of the photoelectric converter ovatel, and the output of the AND gate is connected to another input of the shift register, the output of which via the power amplifier is connected to the marking head. Sources of information taken into account in the examination 1. USSR Author's Certificate No. 404522, cl. B 07, 5/34, 1972. 2. US patent No. 3.359.853, cl. 356-201, 1967. but