JPH1073479A - Radio-type measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the practical measuring device, which can clarify the correspondence relation between the weight data measured with a measuring part and a material to be measured simply and surely. SOLUTION: This device is constituted so as to connect a measuring part 1 for measuring a material to be measured and a display part 2, which displays the weight of the material to be measured that is measured with this measuring part 1 by a radio transmission means 3. In this case, an operating panel 57, which reads the preset data such as the vehicle number of a truck, a trader code and a commodity code, is provided. The load signal of the material to be measured detected with the measuring part 1 is continuously converted into the digital load signal. The digital load signal is converted into the radio signal together with a digital signal indicating the preset data from the operating panel 57. The radio signal is continuously transmitted from a measuring-part-side radio device 4. The radio signal from the measuring-part-side radio device 4 is received by a display-part-side radio device 5 in real time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless weighing apparatus used for a truck scale, a large scale, a hopper scale and the like.

[0002]

2. Description of the Related Art A weighing device as a "scale" for measuring the weight of an object to be measured includes a weighing unit for weighing the object to be measured and a display unit for displaying the weight of the object to be measured weighed by the weighing unit. It is provided integrally and functions as a "scale". In the case of a large scale such as a truck scale, the weighing unit and the display unit are installed at separate places, so that the two units are connected by a wired circuit such as a cable to secure the non-separable integrity.

However, in order to perform data communication by connecting the weighing unit and the display unit by wire, it is necessary to prevent intrusion of noise in the communication line. Therefore, a large-scale cable and a cable for installing the cable are required. It was necessary to provide a culvert. Therefore, when it is desired to relocate the installation place of the weighing device once installed, it is necessary to re-install a long cable and a large cable culvert, which is very inconvenient.

[0004] In order to solve such inconvenience, a device in which a measuring unit and a display unit are connected by wireless transmission means has already been proposed. As this kind of wireless weighing device,
For example, JP-B-63-15789, JP-B-63-48291, JP-A-56-51628, JP-A-1-203926, and JP-A-2-298823.
The ones described in Japanese Patent Application Laid-Open Publication No. HEI 9-163, etc. are known.

However, what has been put to practical use in the above-mentioned conventional various wireless weighing devices is the above-mentioned Japanese Patent Laid-Open No. 2-298.
No. 823, only an electronic hoist scale, and others have not yet been put to practical use.

[0006]

SUMMARY OF THE INVENTION The above-mentioned Japanese Patent Application Laid-Open No. 2-298
The electronic hoist scale described in Japanese Patent No. 823 is provided with a function of calculating and processing measured data in a weighing unit and converting the measured data into a weight value, and the display unit connected by wireless transmission means includes Since the weight value data calculated and processed by the weighing unit is simply transferred and displayed,
Since it was possible to receive the certification as a scale in the measuring section, it was put to practical use.

However, in the conventional wireless weighing device other than the electronic hoist scale, since the weighing device is constituted by the weighing unit and the display unit connected by the wireless transmission means, in particular, the weighing unit and the display unit are connected. If the distance of the measured object is considerably large via the wireless transmission means, the correspondence between the weight data measured by the weighing unit and the setting data such as the truck number, the trader code, and the product code of the measured object becomes unclear. Afraid and not practical.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a practical wireless weighing device that can easily and surely clearly define a correspondence between weight data measured by a weighing unit and an object to be measured.

[0009]

In order to achieve the above object, the present invention takes the following measures. That is, the first feature of the present invention is that a measuring unit 1 that measures an object to be measured,
In a wireless weighing device connected by a wireless transmission means 3 to a display unit 2 for displaying the weight of the object measured by the weighing unit 1, setting data such as a truck number, a trader code, and a product code are transmitted. An operation panel 57 for reading is provided,
The load signal of the measured object detected by the weighing unit 1 is continuously converted into a digital load signal, and the digital load signal is converted into a wireless signal together with a digital signal indicating the setting data from the operation panel 57, The point is that the radio is continuously transmitted from the weighing unit side radio device 4, and the radio signal from the weighing unit side radio device 4 is received in real time by the display unit side radio device 5.

A second feature of the present invention is that the display unit 2 digitally displays a load signal of the weighing unit 1 as a load value in correspondence with setting data from the operation panel 57. According to a third feature of the present invention, the operation panel 57 is provided from an input unit that reads setting data such as a truck number, a trader code, and a product code, and from the display unit 2 via the wireless transmission unit 3. Display means for displaying the returned load signal.

That is, the weight data detected by the weighing unit 1 can be converted into a radio signal together with the setting data from the operation panel 57 and sent to the display unit 2 in real time. The signal can be displayed in association with setting data such as a truck number, a trader code, and a product code from the operation panel 7.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 shows a wireless weighing device in which a weighing unit 1 for measuring an object to be measured and a display unit 2 for displaying the weight of the object measured by the weighing unit 1 are connected by wireless transmission means 3. Have been.

The wireless transmission means 3 includes: a measuring section-side radio 4 for continuously transmitting measurement data from the measuring section 1 as a digital signal on a predetermined electromagnetic wave; and a predetermined distance from the measuring section-side radio 4. The display unit-side wireless device 5 is installed at a distance. The weighing unit-side wireless device 4 and the display unit-side wireless device 5 are provided with a communication control circuit 6 and a wireless unit 7 for transmission and reception, respectively. A predetermined matching number (ID number) is automatically given, and the receiving side identifies the matching number, so that only the data with the matching number is taken in as normal data.

That is, the connection relationship between the weighing unit 1 and the display unit 2 is specified by a matching number assigning unit and a matching number identification unit by the communication control circuit 6 of the wireless transmission unit 3. When this wireless weighing device is used as a truck scale or the like, the cumulative load of the load, which changes every moment during the loading operation of the truck, is continuously monitored on the display unit 2 to control the loading operation. Therefore, it is necessary for the wireless transmission means 3 to continuously transmit the measurement data from the weighing unit 1 to the display unit 2 in real time. Therefore, the wireless transmission means 3 must be able to transmit a large amount of data at high speed and with high accuracy.

In order to satisfy such demands, according to the present invention, the radios 4 and 5 in the radio transmission means 3 transmit digital data in a frequency band of 300 MHz to 3 GHz, a transmission output of 10 mW or less and a transmission antenna from the transmission antenna. The electric field strength at a distance of 3 m is transmitted continuously on a weak radio wave of 501 μV / m or more.
5 is arranged within 500 m.

According to the above-described embodiment, the measuring section 1
The load signal of the object to be measured detected in step (1) is converted into a digital signal continuously (about 1 to 100 times / second), and this digital signal is transmitted at a predetermined frequency selected from a frequency band of 300 MHz to 3 GHz. (Antenna power) is 10 mW or less, and the electric field strength at a distance of 3 m from the transmitting antenna is converted to a radio signal carried on a weak radio wave of 501 μV / m or more, and is continuously transmitted from the radio unit 7 of the measuring unit side radio 4. I do. At this time, the transmission data includes the communication control circuit 6
As a result, a predetermined matching number is automatically given and transmitted together with the matching number.

The display unit-side radio device 5 receives a radio signal from the weighing unit-side radio device 4 in real time by its radio unit 7 and identifies a predetermined matching number by the communication control circuit 6 to determine the matching number. Only the numbered data is fetched as normal data, and the fetched digital load signal is sent to the display unit 2 through a wired circuit. The display unit 2 digitally displays the load signal as a load value and processes the load signal as print data or various cargo handling control data.

According to the embodiment of the above configuration, the separation number of the separated measuring unit 1 and the display unit 2 is ensured by the matching number of the wireless transmission means 3, so that it can be used as a test object as a scale. It becomes. In addition, compared to a configuration in which the measuring unit 1 and the display unit 2 are connected by a wired circuit, cable wiring work is not required, and cable piping and piping work are not required, so that there is no need to install a cable culvert groove.
The installation locations of the weighing unit 1 and the display unit 2 can be easily moved, and there is no cable wiring, so that there is no influence of induced noise due to lightning surge or the like.

Further, since data communication is performed by using a specific electromagnetic wave, long-distance communication of 100 m or more is possible, and long-distance communication of up to about 1000 m is provided by providing a wireless relay device (not shown). Communication becomes possible, and digital load signals can be transmitted in real time. FIG. 3 shows a truck scale as a specific example of the wireless weighing device, which is composed of a weighing unit 1, a display unit 2, and a wireless transmission unit 3 connecting both of them.

The measuring section 1 includes measuring means 8 such as a load cell for measuring the load of a truck as an object to be measured,
An adjusting means 9 for performing zero adjustment and span adjustment of the measuring means 8 is provided. If the measuring means 8 is a load cell that outputs an analog signal, the detected value is output as digital data via an A / D converter, or directly if it is a digital load cell. The detection value is output as digital data of a mass value (load value) by passing through the adjusting means 9.

The wireless transmission means 3 converts the data from the weighing section 1 into a digital signal having a frequency band of 2.0 to 3.0 G.
The measuring unit-side radio unit 4 that continuously transmits on a weak radio wave with a transmission output of 10 mW or less and an electric field strength of 501 μV / m or more at a distance of 3 m from the transmission antenna at a frequency of 3 Hz.
It is installed within 500 m from the weighing unit side radio 4,
And the display unit 2 receives the transmission signal in real time.
And a display unit-side wireless device 5 for transmitting data through a wired circuit.

Each of the weighing unit-side radio device 4 and the display unit-side radio device 5 is provided with a communication control circuit 6, a radio unit 7 for transmission and reception, and the like. A matching number is automatically assigned to the transmission data, and the receiving side identifies the matching number so that only the data with the matching number is taken in as normal data. That is, the connection relationship between the weighing unit 1 and the display unit 2 is specified by the matching number of the wireless transmission unit 3.

The display unit 2 is provided with a display processing device 10 having a CPU board, and is configured to digitally display digital load data input by the processing device 10 on a display. A program for adjusting the adjusting means 9 provided on the weighing unit 1 side is incorporated in the CPU substrate of the display processing device 10. Therefore, the display unit-side radio 5 has not only a reception function but also a transmission function for instructing zero point adjustment and span adjustment, and the weighing unit-side radio 4 also has only a function of transmitting measurement data. Also, it has a receiving function of receiving the adjustment command.

Note that each of the constituent devices requires a DC power supply, and a wiring from one DC power supply to each device is required. Is halved. However, in the above-described embodiment, a power supply of AC 100 V is connected to each of the measuring unit 1, the wireless transmission unit 3, and the display unit 2, and the DC power is obtained from the AC power supply. Therefore, it is sufficient if there is an existing AC100V outlet, and one D
Wiring for supplying DC power from the C power supply to each device is not required.

FIG. 4 shows another embodiment of the present invention, in which the adjusting means 9 for performing zero adjustment and span adjustment is provided on the display unit 2.
2 is different from that shown in FIG. In this embodiment, the wireless transmission means 3
Is a digital signal using the data from the weighing unit 1 in a frequency band of 300 to 500 MHz, a transmission output of 10 mW or less, and an electric field strength at a distance of 3 m from the transmission antenna of 501 μV / m or more. The weighing unit-side radio 4 that transmits the signal, and 500
m, and a display unit-side wireless device 5 that receives the transmission signal in real time and transmits it to the display unit 2 through a wired circuit.

The other structure is basically the same as that shown in FIG. FIG. 5 shows another embodiment of the present invention, in which an operation panel 1 is provided on the weighing unit 1 side of the apparatus shown in FIG.
1 is provided. The operation panel 11 is connected to the communication control circuit 6 of the weighing unit-side wireless device 4 by wire.

The operation panel 11 displays a vehicle number of a truck,
The apparatus includes an input unit 12 for reading print data such as a trader code and a product code, and a display unit 13 for displaying weight data measured by the weighing unit 1. In this embodiment, the wireless transmission means 3 is configured to transmit and receive print data in addition to weight data.

The present invention is not limited to the above embodiment. The predetermined radio wave used for the wireless transmission unit shown in FIG. 3 may be used for the device shown in FIG. 4 and other devices, and the predetermined radio wave used for the wireless transmission unit shown in FIG. You may use for the apparatus shown or another apparatus. Further, it is possible to freely connect a printing device or other external devices to the display unit or the operation panel. Furthermore, since the radio wave used for the wireless transmission means of the present invention has straightness, the radio is installed in a place with good visibility, but when the visibility is poor or long distance, both radios One or a plurality of relay devices may be provided between them. If a relay device is provided, the receiver automatically assigns a different matching number to the transmission data from the master station so that the receiver can distinguish whether the radio wave is from the master station or from the relay station. Be composed.

[0029]

FIG. 1 shows a truck scale as a specific example of the wireless weighing device in the embodiment of FIG. 2, and a weighing unit 1 and a display unit 2 and a wireless transmission means 3 for connecting both of them. It is composed of The weighing unit 1 includes:
A platform on which the truck is placed and a plurality of digital load cells 55 for measuring the load of the truck as the object to be measured are provided. The digital load signal detected by the digital load cell 55 is collected in the junction box 56, and is collected therefrom as weight data.
To the communication control circuit 6.

An operation panel 57 is provided on the weighing section 1 side. The operation panel 57 is connected to a communication control circuit 6 of the weighing unit-side wireless device 4 described later by wire.
The operation panel 57 includes a truck number, a trader code,
Input means for reading setting data such as a product code and display means are provided. The display unit of the operation panel 57 digitally displays the load signal sent back from the display unit 2 via the wireless transmission unit 3 together with the print data sent from the display unit 2 as described later. Display means for displaying the weight data measured by the weighing unit 1.

The display section 2 has a CPU board 58, and digitally displays a load signal from the weighing section 1 as a load value, and processes the load signal as print data or various cargo handling control data. The wireless transmission unit 3 includes a weighing unit 1
The weighing unit-side radio 4 that continuously transmits the weight data from the unit and the setting data from the operation panel 57 as digital signals on a predetermined electromagnetic wave, and is installed at a predetermined distance from the weighing unit-side radio 4. And a display unit-side radio device 5. The weighing unit-side radio 4 and the display unit-side radio 5
Both are two-way radios commonly used for transmission and reception.

The weighing unit side radio 4 and the display unit side radio 5 are provided with a communication control circuit 6 and a radio unit 7 for transmission and reception, respectively. 6, a predetermined matching number (ID number) is automatically given to the transmission data, and by identifying the matching number in the display unit-side radio device 5, only the data with the matching number is taken in as normal data. It is configured.

That is, the connection relation between the weighing unit 1 and the display unit 2 is specified by the matching number assigning means and the matching number identifying means by the communication control circuit 6 of the wireless transmission means 3. In the case of the truck scale, it is necessary to continuously monitor the accumulated load of the loaded material during the cargo handling work of the truck on the display unit 2 and control the cargo handling work. In, it is necessary to continuously transmit the measurement data of the measuring section 1 to the display section 2 in real time. Therefore, the wireless transmission means 3 must be able to transmit a large amount of data at high speed and with high accuracy.

In order to satisfy such demands, according to the present invention, the weighing unit-side radio device 4 and the display unit-side radio device 5 in the radio transmission means 3 transmit digital data in a frequency band of 300.
In the range of MHz to 3 GHz, the transmission power is 10 mW or less and the electric field strength at a distance of 3 m from the transmission antenna is 501 μm.
It is assumed that the radio wave is continuously transmitted on a weak radio wave of V / m or more, and each of the weighing unit side radio device 4 and the display unit side radio device 5 is arranged within 500 m.

According to the above-described embodiment, the digital load signal of the object to be measured detected by the measuring section 1 is continuously (1 to 10).
(About 0 times / sec.) Through the junction box 56 to the communication control circuit 6 of the weighing unit-side radio 4, and the digital signal indicating the weight data is transmitted to the frequency band together with the digital signal indicating the setting data from the operation panel 57. 300MHz
At a predetermined frequency selected from ３3 GHz, the transmission power (antenna power) is 10 mW or less, and the electric field strength at a distance of 3 m from the transmission antenna is converted to a radio signal carried on a weak radio wave of 501 μV / m or more. Weighing unit side radio 4
Are continuously transmitted from the wireless unit 7. At this time, a predetermined matching number is automatically given to the transmission data by the communication control circuit 6 and transmitted together with the matching number.

The display unit-side radio 5 receives a radio signal from the weighing unit-side radio 4 in real time by its radio unit 7, identifies a predetermined matching number by the communication control circuit 6, and Only the numbered data is fetched as normal data, and the fetched digital load signal is sent to the display unit 2 through a wired circuit. On the display unit 2, the load signal of the weighing unit 1 is displayed on the operation panel 57.
The load signal is digitally displayed as a load value in association with the setting data from the computer, and the load signal is processed as print data and various cargo handling control data.

Further, the load signal sent to the display unit 2 is input together with the operation panel 57 and the print data such as the setting data, the load value, the code name, the correction value, and the date sent to the display unit 2 side. The display unit-side radio device 5 converts the radio signal into a radio signal carried on a weak radio wave having a field intensity of 501 μV / m or more as described above, continuously transmits the radio signal, and returns the radio signal to the measuring unit 1. Is received by the side wireless device 4. The operation panel 57 of the display unit 2 digitally displays the load signal sent back from the display unit 2 together with the print data sent from the display unit 2 on its display means.

Each measuring section 1, display section 2, measuring section side radio 4
In addition, a DC power source is required for the display unit side radio device 5, and a wiring from one DC power source to each device is required. Even if a wireless connection is used, the power supply wiring reduces the merits of the wireless connection by half. Is done. Therefore, in the above embodiment, the display unit 2, the junction box 56, the operation panel 57,
AC is applied to each device of the weighing unit side radio 4 and the display unit side radio 5.
A power supply circuit 67 is provided to each of the display unit 2, the junction box 56, the weighing unit-side wireless device 4 and the display unit-side wireless device 5 while a 100 V power supply is connected, and display is performed from the AC power supply via the power supply circuit 67. The DC power required for each of the unit 2, the junction box 56, the weighing unit-side wireless device 4, and the display unit-side wireless device 5 is obtained. Therefore, an existing AC 100 V outlet is sufficient, and wiring for supplying DC power from one DC power source to each device is not required. However, power is supplied to the digital load cell 55 by supplying DC power from an AC power supply provided in the junction box 56 via a power supply circuit 67.

In the above-described embodiment, the adjusting means for performing the zero adjustment or the span adjustment of the detected value of the digital load cell 55 is omitted. Provided on the side of the unit 2, zero adjustment and span adjustment are performed while confirming the display on the operation panel 57 or the display on the display unit 2. According to the embodiment of the above configuration, the weighing unit 1 and the display unit 2 separated by the matching number by the wireless transmission unit 3
Is secured. Further, since the load signal of the weighing unit 1 can be displayed in association with the setting data from the operation panel 57, the distance between the weighing unit 1 and the display unit 2 is considerably large via the wireless transmission unit 3. However, the correspondence between the weight data measured by the weighing unit 1 and the setting data such as the truck number, the trader code, and the product code, which are the objects to be measured, becomes clear.

Further, as compared with the case where the weighing unit 1 and the display unit 2 are connected by a wired circuit, cable wiring work is not required.
In addition, there is no need for cable piping and piping work, and there is no need to install cable culverts. The installation location of the measuring unit 1 and the display unit 2 can be easily moved, and there is no cable wiring. Influence of the induction noise due to the above is eliminated.

Furthermore, since data communication is performed using a specific electromagnetic wave, long-distance communication of 100 m or more can be performed. The present invention is not limited to the above embodiment. The display unit 2 and the operation panel 57
It is free to connect a printing device and other external devices to the printer.

In the above-described embodiment, the digital load cell 55 is used as the measuring means. Alternatively, an analog load cell may be used. In this case, an A / D converter is provided. The analog signal output from the load cell may be converted into a digital signal by the A / D converter, and the digital signal may be input to the measuring unit-side wireless device 4.

In the above embodiment, the present invention is applied to a truck scale. However, the wireless weighing device of the present invention is not limited to a truck scale, but may be applied to a large-sized platform, a hopper scale and other wireless weighing devices. Can also be applied.

[0044]

According to the present invention, the weight data detected by the weighing unit 1 can be converted into a radio signal together with the setting data from the operation panel 57 and transmitted to the display unit 3 in real time. 1 can be displayed in association with setting data such as a truck number, a trader code, and a product code from the operation panel 57, so that the distance between the weighing unit 1 and the display unit 2 is determined by the wireless transmission unit 3. , It is possible to clarify the correspondence between the weight data measured by the weighing unit 1 and the setting data such as the truck number, the trader code, and the product code as the object to be measured, It can be made practical as a device.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a specific configuration of FIG.

FIG. 2 is a block diagram showing an embodiment of the present invention.

FIG. 3 is a block diagram showing another embodiment of the present invention.

FIG. 4 is a block diagram showing another embodiment of the present invention.

FIG. 5 is a block diagram showing another embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 weighing unit 2 display unit 3 wireless transmission means 4 weighing unit-side wireless device 5 display unit-side wireless device 6 communication control circuit 7 wireless unit 57 operation panel

Claims (3)

[Claims] 1. A wireless transmission means (3) between a weighing unit (1) for measuring an object to be measured and a display unit (2) for displaying the weight of the object to be measured weighed by the weighing unit (1). An operation panel (57) for reading setting data such as a vehicle number of a truck, a trader code, and a product code is provided in the wireless weighing device connected by the weighing device (1). It is continuously converted into a digital load signal, and this digital load signal is converted into a wireless signal together with a digital signal indicating the setting data from the operation panel (57), and continuously transmitted from the weighing unit side wireless device (4). A wireless weighing device for transmitting a signal and receiving a wireless signal from the weighing unit side wireless device (4) in real time by a display unit side wireless device (5). 2. The display unit (2) digitally displays a load signal of the weighing unit (1) as a load value in association with setting data from an operation panel (57). The wireless weighing device according to claim 1. 3. The operation panel (57) is sent back from the display unit (2) via input means for reading setting data such as a vehicle number, a trader code, and a product code of a truck, and via a wireless transmission means (3). 3. The wireless weighing device according to claim 1, further comprising: a display unit that displays the load signal.