SU1019470A1 - Device for counting itoms moved by conveyor - Google Patents

Description

The invention relates to agricultural machines, and more specifically to the equipment for the automatic processing of egg flows at large poultry farms that provide for mass production of eggs.

A device for counting articles transported by a conveyor is known, which contains a line of photocells, threshold elements, OR elements, a reading unit and a counter C}

The use of such a device for counting eggs on a conveyor arranged in a chaotic manner is accompanied by large errors, since in this device the criterion (sign) of counting objects is their length in the direction of movement of the conveyor belt. Regardless of how many objects simultaneously fall into the field of view of the photocell line, one object of the greatest length will be counted.

The closest to the invention to the technical essence is a device for counting the number of objects containing a television camera, information output of which is connected to the input of the threshold element, the first output of which is connected to the first input of the first element And, the output of which is connected to the first input of the second element And, the counter , block of selection of one line, block of measurement of movements, setting point and trigger 2}.

A disadvantage of the known device is the use of information contained in the first, middle and last lines of a television frame, therefore when counting a chaotic stream of eggs on the conveyor, errors arise that also reach unacceptably large values

The purpose of the invention is to improve the accuracy of measuring the number of objects when transporting them by a conveyor.

The goal is achieved by the fact that in the device for counting objects moved by a conveyor containing a television camera, the information output of which is connected to the input of a threshold element, the first output of which is connected to the first input of the first element And, the output of which is connected to the first input of the second element And, and a counter, the OR elements, the comparison unit and the first, second and third time measuring channels are entered, each of which is made of the first, 5 second and third elements AND pulse width meter, block subtracting and differentiating element, at each time of the measuring channel the output of the first element 0: ment And through a pulse width meter connected to the input of the subtraction unit, the first output of which is connected to the first input of the second t element And whose output through the differentiating element is connected to the first input of the third element And, the outputs of the third elements And all the time of the measuring channels through the first element OR are connected

0 with the counter input, the first output of the threshold element is connected to the first inputs of the first elements And the time of the measurement channels and to the control input of the comparison unit, the first outputs of which are connected to the second inputs of the first elements AND of the measuring channels and the inputs of the second OR element, the output of which is connected to the second input of the second

0 of the element And whose output is connected to the second inputs of the third elements And the time of the measuring channels, the second outputs of the blocks (the subtractions are connected to the information inputs of the comparison unit, the second outputs of which are connected to the second inputs of the second elements And the time of the measuring channels, the second output of the threshold element is connected to the second input of the first element And to the third inputs of the first elements And the time of the measuring channels.

The drawing shows a functional diagram of the proposed device.

The device contains a television camera 1, the threshold element 2,. the first element AND 3, the comparison unit, the first element OR 5, the counter 6, the second element OR 7, the second element AND 8, the first, second and third time from measuring channels 9-11, each of which consists of the first element AND 12 , meter 13 pulse duration, block I subtraction, second Elemert And 15, differentiating element 1b and the third element And 1 /.

In the AND subtraction block, the subsequent code is subtracted from the previous one received at its input. The differentiating element 1b produces a pulse with a unipolar one-way differential voltage at its input. The operation of the device is considered in the case of counting the eggs moved by the conveyor. The device operates as follows. Television camera 1, placed on top of a conveyor with a transported stream of eggs, provides video signals that display the location of the eggs on a dark background of the conveyor belt. Eggs are arranged arbitrarily on the plane of the conveyor, and the sweep of the television lines is parallel to the vector of the speed of movement of the conveyor belt,. From the output of the television camera 1, the video signals are fed to the inputs through the horn cell 2, which separates the video pulses from the sync pulses, extracts the pulses corresponding to the transitions from a dark background to a white background (direct transition) and from a white background to a dark one (reverse transition). In order to reduce the amount of analyzing information, it gates the video signals of all the TV lines with a rectangular pulse of duration t determined depending on a given conveyor speed j exactly during the interval T. the video signals are output for further processing, Further under the field of view. the image j that occurs on the camera telescope during this interval will be understood. Video signal analysis is performed on three identical time measuring channels 9-11. Consider the operation of the device for several of the most typical situations. In the first case, in the field of view of the camera, there appear one egg of different phases. The sign on which the egg is counted is in the presence of the leftmost point in its projection, on the plane of the conveyor. Therefore, the purpose of processing the video signal of each row is to measure tr 1, corresponding to the time of the direct transition from the beginning of the i-th TV line in the j-th frame, and also to compare successively measured intervals T i. The listed tasks are solved by the channel equipment as follows. The duration is measured by the pulse width meter 13, where the start of the interval T {is determined by the 1st television clock sync pulse supplied from the output of threshold element 2 of the first element 12 and from the last pulse output to the meter 13 input of the pulse width, and the end of the interval is given by the forward transition pulse to another input of the first element I 12 through the comparison block C. ; After that, the meter 13 of the pulse duration of this channel does not participate in the measurements until the end of the row length. The number Nir (i-1) obtained in the pulse width meter 13, proportional to the duration ti, enters the difference subtractor, where the number Nil (11) for the first row of the NC frame (tl) 0, the corresponding interval t ( 1-1.) Of the previous line. In block 14, the difference I Nui-NC, (i-l) is calculated. This difference is transmitted to the input of the comparison unit. Comparison unit 4 is intended to distribute the channels in a sequential order that appears in the line of the direct transition corresponding to different eggs. Its principle of operation is discussed below. In the situation-; In the comparison block 4, the chips corresponding to the arrival of the same information for all three times of the measuring channels are assigned priority channels, ensuring the operation in accordance with the described logic. ,, in block 4 of comparison, the condition 41 L is valid. If this . the condition is then fulfilled on the output channel of the comparison unit 4 corresponding to the given time of the comparison block, a pulse of direct transition appears, which prohibits the continuation of the measurement of the interval G –i with the TZ meter of the pulse duration before the arrival of the clock pulse (L + 1), With the arrival of the latter in block 4 Comparison of this prohibition is reduced immediately 510 for all time measuring channels 9-11. From another output of block 1, the value of the sign of the difference goes to the input of the second element AND 15 to another input of which receives an enabling signal from the comparison block k and then to differentiating element 16, where it is compared with the sign L1-1. When the sign A changes from minus to plus an impulse is produced, which is a sign of the extreme left point of the egg analyzed by the device. For the position of the egg of the first phase at the output of the second element And 8 there is a resolving potential (as the output potential of the first element 3 is prohibitive because the clock of the TV line does not coincide in time with the information video pulse corresponding to the white background of the egg) and therefore at the output of the third element And 17, a pulse appears, separated by differentiating element 16, which through the first element OR 5 is fed to the input of counter 6, In the third phase, the operation of the device proceeds in a similar way. In the second phase, the visible part of the egg is not counted as an egg, since in this case there is not one, but a set of leftmost points. This logic is implemented by the first element I 3 at the output of which a prohibitory (single) signal appears (at the time of coincidence of the sync pulse of the string and the information video pulse corresponding to the white background of the egg), which remains until the beginning (i + l) of the string. This signal is fed to the input of the second element AND 8, to the other input of which a unit potential from the second element OR 7 is supplied in the case when at least one of the outputs of the comparison unit has a inhibitory (unit) potential. When these signals coincide at the inputs of the second element AND 8, it prohibits the output signal applied to the inverse input of the third 0 and 7 element to output the signal from differentiating element 16 to the first element OR 5 and 6 (for the second phase there is a set of leftmost points, false extremum) In the second case, in the field of view of the television camera 1 there are several contiguous eggs, each of which must be counted. The egg in the fourth phase will be counted as in the first phase. For the separation of horizontally touching eggs, the following is provided. The initial stage of processing the egg in the fifth phase is similar to the initial stage of processing the egg in the third phase. In the area of contact between the egg, the processing in the fifth phase has differences. Two contiguous eggs correspond to a continuous video signal level of a white background that intersects the point of contact. The duration tTgf of the video signal in this case will be equal to the maximum length of the string / C corresponding to the field of view of the camera, in the pulse width meter 13 an overfilling will occur, the Pulse of which is blocked, the Determination of the increment in the subtraction block and then the operation of the C comparison block before the arrival (1+ 1) sync pulse line. Practically this TV line is ignored for the second. Later, the increment sign will change from minus to plus, which is a sign of the egg count, and the pulse formed by the differentiating element 16 will pass through the third element 17 and the first element OR 5 will go to the input of counter 6, The proposed device differs from the known devices in that it provides increased accuracy in calculating the number of eggs on the conveyor, including contiguous ones, which, in turn, increases the economic efficiency of the proposed counting device. have a good

Claims (1)

DEVICE FOR ACCOUNT OF SUBJECTS TO BE CARRIED OUT BY A CONVEYOR, comprising a television camera, the information output of which is connected to the input of a threshold element, the first output of which is connected to the first input of the first element And, the output of which is connected to the first input of the second element And, and a counter, o-τη and h and further that} in order to increase the accuracy of the device, OR elements, a comparison unit and the first, second and third time-measuring channels, each of which is made of the first, second and third elements of I, a meter, are introduced into it Call duration pulses subtraction unit j and the differentiating element vremyaizmeritelnom in each channel, the output of first AND Through a pulse duration meter it is connected to the input of the subtraction unit, the first output of which is connected to the first input of the second element And, the output of which through the differentiating element is connected to the first input of the third element And, the outputs of the third elements And all the time from the measuring channels through the first element OR. with the counter input, the first output of the threshold element is connected to the first inputs of the first elements AND time measuring channels and to the control input of the comparison unit, the first outputs of which are connected to the second by the strokes of the first AND elements of the measuring channels and with the inputs of the second OR element, the output of which is connected to the second input of the second AND element, the output of which is connected to the second inputs of the third elements And the measuring channels, the second outputs of the subtraction units which are connected to the information inputs of the comparison unit, the second outputs which are connected to the second inputs of the second element AND time channels, the second output of the threshold element is connected to the second input of the first element And to the third inputs of the first elements And ntov vremyaizmeritolnyhkanalov. Ύ