SU1388920A1 - Device for counting moving articles - Google Patents

Abstract

The invention relates to the field of automatic devices for counting and recording the number of various products moving at arbitrary intervals under conditions of impact on the product of useful vibration. The device provides high accuracy of counting by eliminating false-scraps in the conditions of vibration of the article. LI. The device contains control channels 4, 5, recorder-6. Each channel consists of a photo sensor 1, a two-level comparator 2, and a generator of 3 pulses. The shaper contains NOT elements, OR elements and a trigger. The device provides a detuning of the inevitable multiple photosensors by defining the sequence of operation of the comparator 2. 5 Il. i SL

Description

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The invention relates to automatic devices for counting and recording the number of different products moving at arbitrary intervals in terms of their impact on a useful product (moving products by vibrating ion transport) or harmful vibration.

The aim of the invention is to improve the accuracy of the device by eliminating false triggering in conditions of vibration of products.

I Figure 1 shows the structure of the proposed device.

The device contains in each of the control channels a photo sensor 1, a de-level comparator 2 and a shaper of 3 pulses, consisting of the first and second elements NOT 3.1 and 3. | 2, the second and first elements OR 3J3 and 3.4, and the trigger 3 5. In figure 1 and | kzhe marked: Au 5 - the first and in 1 | opoy control channels 6 - block registration.

The principle of operation of the device lies in the following. When the photo sensor 1 overlaps with its output, its output signal changes from maximum (fully open) to minimum (fully closed) over. by decreasing the intensity of the radiant flux and by giving the inputs to the threshold elements of the comparator 2, the response thresholds KdTopbDc are set in this way, a signal appeared at the very beginning 2.1, and at the output 2.2 at the end of reliable threshold elements are set to the specific thresholds for their operation) Neither, at output 2.1 - at the level of 0.9 of the maximum, at output 2.2 - at the level of 1.1 of the minimum lead of their input signal).

Figure 2 shows the characteristics (comparator for outputs 2.1 and 2.2 (diagrams A 2.1 and A. 2., 2), as well as an indicative graph of the dependence of the output signal at the output of sensor A 1 on its degree of overlap F, where points 1 and 4 correspond to The level of operation of the comparator and the points 2 and 3 are the maximum and minimum values of the input signal.

Due to the finite dimensions of the photocell of sensor 1 when entering and exiting products from the zone of action of the photosensor, output 2.1 will have

priority in case of triggering and release relative to output 2.2 of comparator 2.

When constructing timing diagrams that explain the principle of operation of the device, the following assumptions are taken: the amplitude during the period of vibracil and the speed of movement of the products are constant, since the operability of the device does not depend on these factors.

Depending on the ratio between the dimensions of the photodetector 1 and the amplitude of vibration A, and also depending on its presence and absence, the operation of the device is considered in 3 cases: the amplitude of vibration of the products is greater than the distance between the lines of view of the photodetector; the vibration amplitude is less than the specified distance; no vibration at all.

By the lines of sight are meant parallel straight lines, which form orthogonal projections of the dimensions of the photodetector element in the direction of motion of the products, on a plane parallel to this direction. When the product lines overlap, a comparator is triggered at outputs 2.1 and 2.2.

Fig. 3 shows time diagrams characterizing the processes in the device when the product enters the zone of the photosensor of the first channel.

The product experiences a complex motion consisting of a constant-speed motion and vibration, the amplitude of which varies sinusoidally (for simplicity, the triangular shape of the vibration is shown).

The signals at the comparator output are shown in diagrams A3.1, A3.2 (direct) and A3.1, A3.2 (inverse). The trigger control signals are shown in diagrams AZ. G, A3.4. Control of the S-input (unit installation input) of the trigger is formed according to the law.

A 3.3 A 3.1 + A 3.-2, and control of the R-input of the trigger (installation input yule) according to the law A 3.4 A 3.2 + A 3.1.

Due to the priority operation of comparator 2 on output 2.1 (with respect to output 2.2), the trigger 3.5 is blocked at the R input (signal A3.4), and at the S input it is set to one state (signal A 3.3)

the moment when the product leaves the zone of action of the first photo sensor.

Figure 4 shows timing diagrams characterizing the processes in the device when the product leaves the zone of the photosensor of the first channel.

It is obvious that the signals A3.1, A3.2, AZ.-1, A3.2 in this case are inverse to the corresponding signals given in Fig. 3, and due to the priority release of the comparator on the output 2.1 with respect to the output 2.2 ( when the product leaves the zone of the photodotchet of the first channel, output 2.1 releases first with respect to output 2.2) the trigger 3.5 is blocked at the S input (AZ signal), and at the R input is set to zero (signal A3.4). The specified state of the trigger is maintained until the next product enters the zone of action of the photo sensor 1.

Fig. 3 shows diagrams explaining the principle of operation of the device in cases where the vibration amplitude is less than the distance between the lines of sight, as well as when there is no vibration at all. Diagram A 3.5 shows the output pulses at the output of the first shaper (inverse output of the trigger 3.5).

In all cases, the movement of products through the zone of photosensors 1 to the input of the registration unit 6 comes from the code of the formers 4 and 5 channels of single pulses, in which there are no false signals. photosensors triggered. This ensures accurate counting of products by the registration unit 6 regardless of their vibration.

Accuracy is achieved by using such photosensor circuits.

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and shapers, which, without any complication of the optical part, provide detuning from the inevitable repeated operation of photosensors and shapers under the conditions of vibration.

Claims (1)

Invention Formula A device for counting moving articles, comprising a registration unit and control channels, each of which is made up of a photo sensor and a pulse shaper, photo sensors of the first and second control channels are located sequentially in the area of movement of products at a distance from each other that is longer than one object length, characterized in that, in order to control the accuracy of the device when products vibrate, a two-level comparator is inserted into each control channel, each pulse shaper is made of elements NO, OR and RS trigger, the outputs of the first and second elements are NOT connected respectively to the first inputs of the first and second elements OR, the outputs of which are connected respectively to the R and S inputs of the trigger, in each control channel the output of the photosensor is connected to the input of the two-level comparator, the first output is connected to the input of the first element and the second input of the second element OR pulse generator, the second output of the two-level comparator is connected to the input of the second element and the second input of the first element OR form The pulse rotator, inverse outputs 8-, triggers of pulse drivers of control channels are connected to the inputs of the registration unit. AZL 3 f.l FIG. H AZM FIG 5