SU1665230A1 - Device for inspection of article linear dimensions - Google Patents

Abstract

This invention relates to instrumentation technology. The purpose of the invention is to increase the information content by measuring the linear dimensions of the product fragments. The device consists of a transporting mechanism 1 and a photodetector 9. The linear dimensions of the object are measured by changes in the light signal at the photodetector 9. 1 cpff., 2 cpff. 3 il.

Description

The invention relates to a measuring and control technique and can be used to control the linear dimensions of products.

The purpose of the invention is to increase the information content by measuring the linear dimensions of the product fragments and improving the accuracy due to the additional control of the movement of the product and shielding the photodetector from spurious signals.

Figure 1 shows the mechanical layout of the device; figure 2 - structural diagram of the electrical part of the device; on fig.Z - timing charts of the blocks of the device.

The device consists of a transporting mechanism 1, designed to move a controlled product mechanically connected with mechanism 1 of a gearbox 2 and an electric motor 3, a sensor for moving a product made in the form of a gear wheel 4 mounted on the axis of an electric motor 3, and a magnetic head 5 having a magnetic contact with a wheel 4, optically coupled laser 6, a translucent mirror 7, a mirror 8 and a photodetector 9 intended for optical communication with a monitored product, optically connected with a mirror 7 mirror and 10 and photodetector 11, the two slit diaphragms

12, located in front of the photodetectors 9 and 11, transmissive reading scale

13, located on the mechanism 1 and intended for optical communication with the photodetector 11 in the process of moving the mechanism 1, the signal processing circuit 14, the input of which is connected to the output of the photoreceiver 9, n electrical circuits, each of which consists of series-connected circuits 15 forming a pulse of length, the inputs of which are connected to the k-that pair of outputs of the circuit 14, and the comparison block 16 with the tolerance limits, and the minimum tolerance limits of the tolerance boundaries connected in series, the first input of which is connected to the first of the k-th air output circuit 14, and the knob 18 maximum tolerance limits, the output of which is connected to the second input of block 16, the second inputs of knobs 17 and 18 are connected to you

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the course of the head 5, the coincidence circuit 19, the inputs of which are connected to the outputs of the n blocks 16, the signal processing circuit 20 whose input is connected to the output of the photodetector 11, and n formers 21 of the reference pulses, the first input of the former 21 is connected to the circuits 20, the output of the k-driver 19 is connected to the third input (Stop input) of the set 17 of the electric circuit, and the second inputs of the drivers 21 are combined and connected to the n + 1-th output of the circuit 20.

The device works as follows. The motor 3 through the gearbox 2 rotates the mechanism 1, on which the measured products 22 are laid, and moves the products 22 in the area of the laser beam 6, while the product casts a shadow on the slit diaphragm 12. The amount of light that is inversely proportional to the cross section of the product 22 enters the photodetector 9 the plane of the slit diaphragm 12. Thus, by changing the signal 23 of the photodetector 9, it is possible to judge that not only the edges of the product, but also intermediate places for changing the shape of the product 22, enter the zone of the slit diaphragm 12. Signals 24 - 35 are also shown in FIG.

 During the rotation of the electric motor 3, the movement sensor of the product, consisting of a gear 4 and a magnetic head 5, outputs pulses 29 (FIG. 3), the number of which is proportional to the movement of the product 22.

The signal 23 of the photodetector 9, after double differentiation, acquires a pulsed form 24, and the position of crossing the zero of the signal 24 does not depend on the level of illumination, but depends only on the position of the places where the shape of the product 22 changes.

After comparing with the zero level and demultiplexing in the circuit 14, the pulses corresponding to each change in shape are transmitted to the corresponding circuit 15 and to the input of the setters 17. At the output of the circuits 15, signals 26,27,28 are formed, corresponding to the lengths of the controlled dimensions of the product 22, 17, signals 30, 32, 34 are formed, corresponding to the minimum allowable controlled dimensions of article 22. At the end of signals 30, 32, 34, arriving at the setters 18, signals 31,33,35 are formed at the output of the latter, corresponding to the end tolerance roliruemye dimensions of the article 22.

Signals 31 and 26.33 and 27, 35 and 28 arrive at blocks 16, and if the end of signals 26, 27, 28 coincides with signals 31, 33, 35, respectively, then the product 22 is suitable for this monitored size and blocks 16, a fit signal appears in a controlled size.

The fit signals are controlled by the size of all the blocks 16 and are fed to the input of the coincidence circuit 19, at the output of which the fit signal is generated.

For the correction of additive error,

associated with the error of the reducer, the signal of the photodetector 11, converted by the circuit 20 (FIG. 3) and the formers 21 of the reference pulses, is fed to the third input (Stop input) of the setters 17 of the minimum acceptance limits for tolerances on the dimensions being monitored.

Claims (3)

Invention Formula 1, A linear dimensions control device comprising a transport mechanism for moving an article, an article transfer sensor and an optically coupled radiation source and a photodetector, intended for optical communication with the product, characterized in that, in order to increase the information content by measuring the linear dimensions of the product fragments, it is provided with a processing circuit signals, the input of which is connected to the output of the photodetector, n electrical circuits, each of which consists of a series-connected circuit for forming length pulses, the inputs of which connected to the k-pair of outputs of the signal processing circuit, and the comparison unit with the tolerance limits, and serially connected setters of minimum tolerance limits, the first input of which is combined with the first input of the name-shaping circuit, the length pulses, and the setting unit of the maximum tolerance limits, the output of which is connected to the second input of the comparison block with the tolerance limits, the second inputs of the setting units are combined and connected to the output of the movement sensor of the product, and the coincidence circuit, the inputs of which are connected to the outputs of the blocks compare with tolerance limits. 2. The device according to claim 1, about tl and h and y e e- 0 so that, in order to improve accuracy, it is equipped with a second photodetector, optically coupled to a radiation source, transmitting a reference scale located on the transport mechanism and 5 designed for optical communication with the second photodetector during the movement of the product, the second signal processing circuit, the input of which is connected to the output of the second photodetector, n forming device mi reference pulses, the second inputs of which are combined and connected to the n + 1 output of the second signal processing circuit, the first input of the former of the reference pulse generator is connected to the kit to the output of the second signal processing circuit, and the output is connected to the Stop input of the master minimum limits of tolerance of the electric circuit. 3. The device according to claim 1, characterized in that, in order to increase accuracy, it is provided with a slit diaphragm located in front of the photodetector. 22 Shig.2. GB 27 28 „Good