JP2002048624A - Metering apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a metering apparatus by which a plurality of objects, to be metered, whose lengths and shapes are different can be metered precisely while they are mixed. SOLUTION: The metering apparatus 1 is constituted in such a way that a conveyor member 4 which drives an object a, to be metered, so as to be conveyed to a direction identical to the conveyance direction of conveyance conveyors 2, 3 is placed on a balance member 5 in the conveyance route of the conveyance conveyors 2, 3 which convey the object a, to be metered, to a definite direction. A balancing part 6 which is higher than, and parallel to, the conveyance face of the conveyance conveyors 2, 3 is installed in the center on the conveyance face of the conveyance member 4, Both end parts of the conveyor member 4 and the balancing part 6 are connected by slope parts 7, 8. An indicating instrument 10 to which a weight-value signal transmitted from the balance member 5 is input is installed. The indicating instrument 10 is constituted in such a way that a weight value sensed at a time when the center of gravity of the object a, to be metered, is placed on the balancing part 6 is judged to be the true weight value of the object a to be metered. Since the object a, to be metered, placed on the balancing part 6 does not come into contact with the conveyance conveyors 2, 3, the plurality of objects a, to be metered, whose shapes and lengths are different can be metered while they are mixed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weighing device which is arranged in a conveyor for transferring an object to be weighed and automatically weighs the object while moving the object.

[0002]

2. Description of the Related Art As shown in FIG. 6, which is a schematic front view showing a use state, a conventional kind weighing apparatus 50 is disposed between transport conveyors 51 and 52 which are transport paths.
A belt-type conveyor member 54 that circulates and moves in the same direction as the transport conveyors 51 and 52 is placed on the weighing member 53, and above the end of the conveyor member 54 where the object a to be weighed enters, In some cases, a photoelectric tube 55 is provided to output a detection signal when the object a is detected. Then, the object to be weighed a is conveyed to the weighing device 50 by one of the conveyors 51 and completely placed on the conveyor material portion 54,
When the center of gravity of the object to be weighed a is located at the center of the conveyor member 54, the weighing member 53 weighs the entire conveyor section 54, and after weighing, sends it to the other conveyor 52. That is, on the weighing member 53 side, the weight value detected after the lapse of the set time t after receiving the detection signal from the photoelectric tube switch 55 is set as the true weight value. The determination is made in consideration of the moving speed of the member 54 and the length of the object a. Therefore,
A long object to be weighed a has a longer set time t than a short object to be weighed.

[0003]

SUMMARY OF THE INVENTION
Since the set time t varies depending on the length of the weighing object a, it is difficult to mix and weigh the weighing objects a having different lengths, and the two weighing objects a are simultaneously placed on the conveyor member 54. There is a problem that accurate weighing cannot be performed because the object to be weighed a longer than the conveyer member 54 is placed on or over the adjacent conveyor 51 or 52. An object of the present invention is to solve these problems, and an object of the present invention is to solve the problems.

[0004]

According to a first aspect of the present invention, there is provided a weighing device, wherein the object to be weighed is transported along a transport path of the transport conveyor for transporting the object to be weighed in a fixed direction. A conveyor member to be conveyed in the same direction is placed on a weighing member, and a horizontal and higher balance portion is provided at the center of the conveying surface of the conveyor member, which is higher than the conveying surface of each conveying conveyor, and both ends of the conveyor member are provided. A weighing device having an indicator for inputting a weight value signal transmitted from the weighing member, wherein the indicator is connected to the balance unit with an inclined unit, and the center of gravity of the object to be weighed is the balance unit. Is determined as the true weight value of the object to be weighed.

According to a second aspect of the present invention, in the weighing apparatus, the balance portion and each inclined portion of the conveyor member of the first aspect are constituted by separate conveyors, and the balance portion is placed on a balance. It is characterized by the following. That is, a conveyor member that conveys the object to be weighed in the same direction as the conveyance direction of the conveyor is provided on a conveyance path of a conveyor that conveys the object to be measured in a certain direction, and the conveyor member is located at the center. A balance conveyor that is higher and horizontal than the transfer surface of each transfer conveyor, and a pair of inclined conveyors that are located at both ends of the balance conveyor and connect the balance conveyor and the transfer conveyor, and the balance conveyor is a weighing member. A weighing device provided with an indicator for inputting a weight value signal transmitted from the weighing member while the weighing object is placed on the balance conveyor. The detection value is determined to be the true weight value of the object to be weighed.

Further, the weighing device according to a third aspect of the present invention is the weighing device according to the first or second aspect, wherein the weighing device is constituted by a belt conveyor that circulates and moves a conveyor member, and the length of the balance portion is reduced. , Is set shorter than the object to be weighed.

[0007]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Here, FIG. 1 is a schematic front view showing a use state in the first embodiment, FIG. 2 is a graph showing changes in weighing values of two types of objects to be weighed, FIG. 3 is a block diagram of a weighing device, FIG. 4 is a flowchart of the weighing operation, and FIG. 5 is a schematic front view showing a use state in the second embodiment.

First, a first embodiment will be described with reference to FIGS. As shown in FIG. 1, the weighing device 1 transfers the object to be weighed a between the conveyors 2 and 3 between the conveyors 2 and 3 which is a conveyance path for conveying the object to be weighed a in a certain direction. Conveyor member 4 for conveying in the same direction as
Is placed on the scale member 5.

As clearly shown in FIG. 1, at the center of the conveying surface of the conveyor member 4, a balance portion 6 which is higher and horizontal than the conveying surfaces of the respective conveyors 2 and 3 is provided. The balance unit 6 is connected to the balance units 7 and 8 at the same inclination angle. The balance section 6
Has its length set shorter than the weighing object a,
There is no danger that a plurality of objects to be weighed a will be placed on the balance unit 6 at the same time, and the objects to be weighed a are weighed one by one without fail.

As shown in FIGS. 1-3, the weighing member 5
Includes a load cell 9 having a sensor (not shown) for continuously detecting a weight value, and outputting a weight value detected by the sensor as a weight value signal. The signal is received and the displayed peak value p of the weight value (see FIG. 2), in other words, the object to be weighed a
Of the weight when the center of gravity of the
Is connected to the indicator 10 configured to determine the true weight value.

As shown in FIG. 3, the indicator 10 includes an amplifier 11 for amplifying an analog signal which is a weight value signal from the load cell 9, an analog filter 12 for removing frequencies other than a predetermined frequency, and an analog signal. 13 for converting a digital signal into a digital signal, and a digital filter 14 for removing a portion of the digital signal other than a predetermined range.
And a CPU 15 for performing arithmetic processing on the digital data, which is a digital signal, a comparator 16 for comparing the data processed by the CPU 15 with reference data stored in advance and outputting as a weight value, and a display data of the comparator 16. And a display 17 for digitally displaying the weight value. That is, the CPU 15
A RAM 18 that stores digital data input from the digital filter 14 and a ROM 19 that stores programs and the like necessary for the arithmetic processing of the indicator 10 are connected. Then, the CPU 15 calculates the data stored in the RAM 18 based on a program, determines that the peak value p among the calculated values is the true weight value of the weighing object a, and outputs the calculated value (not shown). ).

Next, referring to FIG. 4, an object a to be weighed conveyed from the conveyor 2 in the weighing device 1 will be described.
The operation of weighing the weight will be described.

When the objects to be weighed a are transported by the transport conveyors 2 and 3 and the weighing by the weighing device 1 is started, the weight of the conveyor member 4 is continuously detected by the weighing member 5 (step 101), and the load cell is loaded. 9 continuously outputs an analog signal which is a weight value signal of the conveyor member 4.

In the indicator 10 to which the analog signal has been input, the analog signal is amplified by the amplifier 11 (step 102), and a frequency portion other than the predetermined frequency, which is noise, is removed by the analog filter 12 (step 10).
3).

The converter 13 converts the analog signal from which noise has been removed into a digital signal (step 10).
At the time of 4), it is determined whether or not the conversion has been performed. If it is determined that the conversion has been performed (YES), the output signal is sent to the digital filter 14 and it is determined that the conversion has not been performed (NO). Then, the process returns to the above-mentioned step to convert the analog signal again (step 105).

The digital filter 18 removes unnecessary part data of the digital signal outside the predetermined range (step 106), and sequentially transmits and stores the digital data of the continuous weight value of the conveyor member 4 to the RAM 17.

The continuous digital data of the conveyor member 4 stored in the RAM 18 is processed by a calculation unit (not shown) based on a program, and the peak value p (see FIG. 2) of the continuous weight values is calculated. ) Is subtracted from the weight value of the conveyor member 4 itself input in advance to obtain the true weight value of the object a.

The reason why the graph of the weight value of the conveyor member 4 is shaped as shown in FIG. 2 is that the object to be weighed a is transferred from the conveyor 2 to the conveyor member 4 of the weighing device 1. The detection weight value rises while astride the conveyor 2 and the inclined portion 7 and gradually rises up the inclined portion 7, reaches a peak value p of the weight value with the center of gravity resting on the balance portion 6, and thereafter, reaches the peak value p. This is because the detected weight value is gradually lowered by moving to step 8 and descending to straddle the inclined section 8 and the conveyor 3. Then, among the weight values calculated as described above, the peak value p, which is the detection value when the center of gravity of the object a is placed on the balance unit 6, is determined as the true weight value of the object a. Things. In FIG. 2,
Graph x shows a change in the weight value in a state where the short weighing object a is placed on the conveyor member 4, and the short weighing object a is unlikely to lose its balance on the balance unit 6, and its center of gravity is Since the time during which it is on is relatively long, the peak value p
Is relatively long. Graph y shows a change in the weight value when the long object to be weighed a is placed on the conveyor member 4, and the long object to be weighed a easily loses its balance on the balance portion, and its center of gravity is balanced. Since the time of staying in the section 6 is relatively short, the horizontal portion of the peak value p is shorter than in the case of the graph x.

The comparator 16 compares the data of the peak value p calculated by the CPU 15 with reference data stored in advance and outputs it to the display 17 as the weight value of the object a. The display 17 digitally displays the weight value of the object a so that the weight value can be visually recognized.

Next, a second embodiment will be described with reference to FIG. In the weighing device of this embodiment, the balance portion 6 and the inclined portions 7 and 8 of the conveyor member 4 in the above-described first embodiment are configured by separate conveyors, and the other configurations are the same as those of the first embodiment. Since it is the same as the embodiment, only the configuration of the conveyor member will be described.

The weighing device 31 is provided between the transport conveyors 32 and 33, which are transport routes for transporting the object a in a certain direction.
A conveyor member 34 for conveying the object to be weighed a in the same direction as the conveying direction of each of the conveyors 32 and 33 is provided. The conveyor member 34 is higher than the conveying surface of each of the conveyors 32 and 33 and has a horizontal balance. The balance conveyor 36 includes inclined conveyors 37 and 38 provided at both ends of the balance conveyor 36 at the same inclination angle.

The balance conveyor 36 is placed on the weighing member 35, and the length thereof is set shorter than the light-weight object a. There is no danger of being put on, and the objects to be weighed a are weighed one by one.

In the present embodiment, of the weight values of the balance conveyor 36, a value obtained by subtracting the weight value of the balance conveyor 36 itself from the peak value p shown in FIG. I do. The balance conveyor 3
The weight value graph of FIG. 6 has a shape as shown in FIG. 2 because the object to be weighed a is straddled between the inclined conveyor 37 and the balance conveyor 36 when being transferred, and is gradually placed on the balance conveyor 36. As the weight shifts, the detected weight value also increases, and reaches the peak value p of the weight value in a state where the center of gravity of the object a is placed on the balance conveyor 36. Thereafter, when the object a shifts to the inclined conveyor 38. Therefore, the detected weight value gradually decreases.

Then, the peak value p, which is a detection value when the center of gravity of the object a is placed on the balance conveyor 36, is determined as the true weight value of the object a. The other weighing operations are the same as those in the first embodiment, and thus the description thereof is omitted.

The present invention is not limited to the above embodiments. For example, the conveyor member 4 may be a roller conveyor instead of a belt conveyor.
Also, a pair of inclined portions 7 and 8 and each inclined conveyor 3
The angles of inclination of each other may be different.

[0026]

As described above, according to the weighing device of the first aspect of the present invention, the center of gravity of the object to be weighed is placed on the balance portion at a position higher than the conveyor, and is detected in a state separated from the conveyor. The weight value is set to be the true weight value, so that even if multiple objects with different shapes and lengths are mixed, it can be weighed, and even objects longer than the conveyor member are placed on the balance section. In the state, there is no contact with the conveyor, so that there is an effect that accurate measurement can be performed.

According to the weighing device of the present invention described in claim 2, in addition to the effect of claim 1, in addition to the balance portion which is a horizontal portion of the conveyor member and the inclined portion which is each inclined portion are separately provided. Since it was composed of a conveyor, the design of the conveyor members,
This has the effect of facilitating manufacture.

Further, according to the weighing device of the present invention, since the conveyor member is constituted by a circulating belt conveyor, the object to be weighed moves smoothly on the conveyor member and the balance section is formed. Since the length is set shorter than the length of the object to be conveyed, there is no risk that a plurality of objects to be weighed will be placed on the balance unit at the same time, and there is an effect that the objects to be weighed can be reliably measured one by one.

[Brief description of the drawings]

FIG. 1 is a schematic front view showing a use state.

FIG. 2 is a graph showing changes in measured values of two types of objects to be weighed;

FIG. 3 is a block diagram of a weighing device.

FIG. 4 is a flowchart of a weighing operation.

FIG. 5 is a schematic front view showing a use state in another embodiment.

FIG. 6 is a schematic front view showing a use state in a conventional example.

[Explanation of symbols]

 Reference Signs List 1,31 Measuring device 2,3,32,33 Conveyor 4,34 Conveyor member 5,35 Weighing member 6 Balance unit 7,8 Inclined unit 9 Load cell 10 Indicator 11 Amplifying unit 12 Analog filter 13 Converter 14 Digital filter 15 CPU 16 Comparator 17 Display 18 RAM 19 ROM 36 Balance conveyor 37, 38 Incline conveyor 50 Weighing device 51, 52 Transport conveyor 53 Weighing member 54 Conveyor member 55 Photoelectric tube switch

Claims (3)

[Claims] 1. A conveyor member for transporting the object to be weighed in the same direction as the transport direction of the transport conveyor is placed on a weighing member on a transport path of the transport conveyor for transporting the object to be weighed in a fixed direction. While providing a horizontal and horizontal balance portion higher than the transport surface of each transport conveyor at the center of the transport surface of the conveyor member, while connecting both ends of the conveyor member and the balance portion with respective inclined portions, from the weighing member A weighing device provided with an indicator for inputting a weight value signal to be transmitted, wherein the indicator detects a detection value when the center of gravity of the weighing object is placed on the balance section as a true weight value of the weighing object. A weighing device configured to make a determination. 2. The weighing device according to claim 1, wherein the conveyor member comprises a balance section and each inclined section constituted by separate conveyors, and the balance section is placed on a weighing member. 3. The conveyor member according to claim 1 or 2, wherein the conveyor member comprises a circulating belt conveyor.
A weighing device characterized in that the length of the balance section is set shorter than the object to be weighed.