JPS58187815A - Measuring conveyer - Google Patents

Abstract

PURPOSE:To perform the accurate correction to a static measured value, by providing a plurality of conveying sections on a chain conveyer, detecting which section of said sections reaches a specified load detector, and performing correction to the static measured value by a correcting constant and the like corresponding to the section. CONSTITUTION:A carrier 10a conveys a material to be measured. When the material reaches a load detector 5, an output ''1'' is generated in an output line (a) of a judging logic circuit 35 and supplied to an AND gate 40a. Then a correcting constant and the like for the carrier 10a, which are stored in a correcting value register 38a, are supplied to an adding and subtracting device 46. A dynamic digital measured signal, which is converted from the output of the load detector 5, is supplied to the adding and subtracting device 5. The adding and subtracting device 6 adds or subtracts the correcting constant to or from the dynamic digital measured signal, and the dynamic digital measured signal is corrected to a static digital measured signal. Every time when the output ''1'' is generated in the output lines (b)-(d) of the judging logic circuit 5, the correction is performed to the static digital measured signal in the same way. In this way, the correction is always performed to the accurate static value.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a weighing conveyor, and more particularly to a weighing conveyor capable of correcting one shift of dynamic cutting to a static weighing value. .

Generally, a weighing conveyor weighs an article while it is being conveyed, so the measured value (dynamic weight value) differs from the weight value measured with the object being weighed stationary (static weight value). Yes, it is necessary to correct dynamic measurement values to static measurement values. Therefore, for example, in a weighing conveyor using a belt conveyor, an object whose static weight value is known in advance is conveyed on the belt conveyor multiple times, and the average value of the dynamic weight values is calculated. A correction constant, which is the ratio of the difference between the first shift and the static meter value, is calculated, and this is used to correct the dynamic weight value of the object to be weighed whose weight is unknown to the static weight value. In the case of a belt conveyor, no matter which part of the belt conveys the article to be weighed, the breakage in each part of the belt is almost uniform, so the above correction can be made. Now, there are variations in the weight of the cheno, and no matter where it is being transported, the correction using a constant correction value cannot correct it to a static weight value. In addition, if a carrier is installed on the cheno to facilitate the transportation of items to be weighed,
Due to the influence of rY fluctuations in the weight of the valley carrier and the mounting condition, it became increasingly difficult to correct the static weighing value.

This invention was made to solve the above problem, and a plurality of conveyance sections are provided along the conveyance direction of the chino, a correction constant is determined in advance for each conveyance section, and each conveyance section has a load detector. Each time it reaches the top, the current dynamic needle (direction) is corrected to the static weighing field by the arm correction constant corresponding to the conveyance section reached.

Hereinafter, the present invention will be explained in detail based on one embodiment implemented in a high-speed weighing conveyor.

The high-speed weighing conveyor according to the present invention has a total of two 'r4F conveyors 2 in order to increase the number of weighing pieces per unit time, and the elbow conveyor has two chains of 3a.
13b is stretched in parallel, and the weighing platform 4 is placed at an appropriate place on the tensioning route.
and a load detector 5 are arranged. The weighing conveyor 2 has two chains 6a.

6b is stretched outside the chinos 3a and 3b, and the weighing platform 7 and load detector 8 are arranged at a position slightly apart from the weighing platform 4 and load detector 5. A carrier 9 is placed between the holes 3a and 3b at an appropriate interval as shown in FIG.
carriers 10a to 10d are provided between the carriers 9a to 9d, and the carriers 10a to 10d are provided between the carriers 9a to 9d.
b, 6a, and 6b are caused to travel synchronously by a motor 12. Therefore, after the article to be weighed conveyed by Cheno Sa, 3b passes through weighing platform 4, the article conveyed by Cheno 6a16b passes through weighing platform Ma, so that the number of items to be weighed per unit time is increased. It will be done.

A rotation detection disk 14 is attached to the motor 12, as shown in FIG. This rotation detection disk 14 is
In cooperation with the optical detector 15, each time the carriers 9a to 9d pass the weighing platform 4, the weighing platform 7 is moved to the carrier 10a.
The line (surin)-1a is formed so as to generate a detection pulse every time 1Od to 1Od passes. 4th detection pulse
Shown in Figure (b). In the figure, 18a is the carrier 9a
However, 18b is a detection signal generated when the carrier 9b passes over the weighing platform 4, 18c is a detection signal generated when the carrier 9C passes over the weighing platform 4, 20a is a detection signal generated when the carrier 9d passes over the weighing platform 4, 20b is a detection signal generated by the carrier 10b, and 20c is a detection signal generated when the carrier 9d passes over the weighing platform 4. is carrier 10c
However, 20d is the detection+lus that occurs when the carrier 10d passes over the weighing platform.

Further, the rotation detection disk 14 is formed with a slit 25 so as to cooperate with the optical detector 22 and generate a reset pulse 24 when the carrier loa passes over the meter needle base metal. The reset pulse 24 is 3 degrees as shown in FIG. "]" and "30" are set to "4". Since the detection pulses 18a to 18d and 20@ to 20d are supplied to the terminals J and 1 of the flip 70 knob 26, their Q and Q outputs are as shown in Fig. 4 (0) and (d).
), after the reset pulse 24 is supplied, the detection pulses 18a to 18d are inverted every time the detection pulses 120a to 20d are supplied. The detection pulse 18a is passed through the AND gates 32 and 34 which are opened and closed by the Q and Q outputs.
18d to 18d, 20a to 20d are counters 28.3
0, the count values of counters 2B and 30 change as shown in the table below.

Therefore, the Q output of the flip-flop 26 is "L" at J-.
When the count value of the counter 2 is determined, it is possible to determine which of the carriers 9a to 9d is on the weighing platform 4. When the output of the flip 26 is 11'' at J, the count value of the counter 30 is determined. By making this determination, it is possible to determine which of the carriers lOa to 10d is on the weighing platform 7. The circuits for this purpose are logic discrimination circuits 35 and 36. The discrimination logic circuit 35 outputs an output line a when the carrier 9a is on the weighing platform, an output line a when the carrier 9b75q1"ffi is on the weighing platform 4, and an output line when the carrier 9C is on the weighing platform 4. , output line C, and output line d when the carrier 9d is on the feather weighing table 4, respectively. When the carrier lOa is on the weighing platform 7, the roundness determination logic circuit 36 outputs an output line θ.
...When the carrier 10d is on the weighing platform 7, the output &
i h to produce outputs rlJ, respectively. Since these circuits can be easily constructed using an AND circuit and an inverter, detailed explanation thereof will be omitted.

The static correction value calculation and storage circuits 37 and 42 perform correction to the static meter value using the outputs of the discrimination logic circuits 35 and 36.
done by. Since both weighing conveyors 1.2 are similarly corrected by these circuits, only the circuit 37 for weighing conveyor 1 will be described. 3Sa to 38d are correction value registers located at 38a. The device for this storage will be briefly described below. When the carrier 1oB transports the article to be weighed and reaches the load detector 5, the logic discrimination circuit 3
An output "1" is generated on the output line a of 5, and the AND gate 40a
The A/D converter 44 corrects the force (dynamic analog needle leaf signal of the article to be weighed carried by the carrier 10a) into a dynamic till weighing signal. Hereinafter, similarly, each time an output "1" is generated on the output lines 1 to d of the discrimination logic circuit 35,
1d is done as follows. The switch 4 is closed and a correction start signal is supplied from the correction start signal generator 50 to the AND gates 52a to 52d. Then, master pieces having substantially the same stationary electric switches are placed on the carriers 9a to 9d, 110a to lOd, and transported. In addition to the correction start signal, 52a also includes a discrimination logic circuit 3.
Since the output of the output line a of 5 and the current digital measurement signal are supplied to the A/D converter, the carrier 9a is stored in the accumulation register 54a to which the output of the AND gate 52 is supplied.
The dynamic digital weighing values of the master piece on the carrier 9a are accumulated each time the master piece reaches the load detector 5. Also, every time an output is generated on the output line a of the discrimination logic circuit 3!5, a detection pulse is sent to the counter 58a via the AND gate 56a.
is counted. The number of times the carrier 9a reaches the load detector 5, .11 is shown in FIG.

Then, when this count value reaches a predetermined value, 151
'7 The cumulative value of the cumulative register is divided by a predetermined value in the multiplier 60a, and the average value of the dynamic digital measurement values is calculated.
ft value IG device 66 is an A/D that converts the dynamic analog weighing signal of the load detector 8 into a dynamic digital weighing signal.
A converter 68 converts this dynamic digital metering signal into carriers 10a to 10 in the static correction value calculation and storage circuit 42.
The corrections at d68 are performed alternately because the decision logic circuits 35, 36 produce outputs alternately. Further, static correction value calculation and storage of correction constants in the storage circuit 3'7.42 are performed in parallel.

This invention allows accurate static weighing values to be obtained even if there are variations in the weight of the carriers, variations in the weight of the carriers, or variations in the mounting condition of the carriers. It can be corrected. Therefore, it is not necessary to take into consideration the constant weight of the weighing conveyor and the carrier at the time of manufacture, and there is no need to take into consideration the mounting state of the carrier, thereby improving the manufacturability of the weighing conveyor.

In the example described in item 1, two weighing conveyors were installed in parallel, but
Only one unit may be used, or three or more units may be installed in parallel.

The number of carriers can also be increased or decreased depending on the usage situation, and in extreme cases no carriers are required. As the correction constant, the difference between the average value of the static metric value and the dynamic metric value is used, but the ratio of the average value of the dynamic metric value to the static metric value may also be used.

In that case, a divider is used instead of the subtractors 62a to 62d.
A multiplier must be used in place of the edge subtractor 46.

In order to generate the reset pulse 24, a slit 25 and an optical detector 22 are used, but if the width of one of the slits 16 is made different or another slit is added close to one of the slits 16, , slit 25, and optical detector 22 are unnecessary. Instead of the detection rotation disk 14, a light shield may be provided on the carrier, and an optical detector may be provided on the side of the conveyor. A magnetic detector may be used in place of the optical detector.

[Brief explanation of the drawing]

FIG. 1 is a front view of a high-speed measuring conveyor embodying the present invention, FIG. 2 is a front view of the same, FIG. 3 is a block diagram of the same, and FIG. 4 is a timing chart of the same. 3a, 3b,, 6a, 6b □-・Cheno, 5.
8...Load detector, 15.16...Detection pulse generation circuit, 22.25...Count open flh signal, 28
．． 30...Counter, 35.36...Discrimination logic circuit, 38a to 38d...Correction value register Patent applicant: Daiwa Seiko Co., Ltd.

Claims (1)

[Claims] (1) At least two chains tensioned so that the weight of the article to be weighed being conveyed can be applied to the load detector, and a conveyance section with a predetermined number of membranes along the conveyance direction of the chain. A circuit that generates a detection pulse every time the load detector is reached; a circuit that generates a count start signal every time the predetermined position of the chino reaches the load detector; a discriminating logic circuit that responds to the count 1 of this counter and generates a discriminating signal representing the above-mentioned transport section inserted into the load detector; A weighing conveyor comprising a correction value register which is provided in a corresponding manner and stores a predetermined static correction constant for a corresponding section, and a circuit according to the above discrimination +3.