JP5340000B2 - Vehicle weight measurement system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle weight measuring system which normally holds a wireless communication environment between the load cell and the weight measuring device and facilitating maintenance about the electric power supply to the load cell. <P>SOLUTION: In the vehicle weight measuring system 1 including: a weighing platform 2 constituted by supporting a mount platform 7 which mounts a vehicle thereon by the load cell 8 and incorporated into a pit 6 formed by digging a ground surface 5; an antenna 12 for wirelessly transmitting a weighing signal output from the load cell 8 toward a weight measuring device 4 disposed at a place separated from the weighing platform 2 when the vehicle is mounted on the weighing platform 2; and a power supply device 11 supplying electric power to the load cell 8, the antenna 12 and the power supply device 11 are installed on the ground surface 5 outside the weighing platform 2, respectively. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a vehicle weight measurement system that measures the weight of a vehicle such as a truck and transmits a weight signal based on the measurement result to a remotely-measured weight measurement device.

Conventionally, in a vehicle weight measurement system using a load cell, a weighing platform comprising a plurality of load cells and a steel platform supported by the load cells is incorporated into a concrete pit formed by digging the ground surface. A vehicle such as a truck is placed on a weighing platform built in a pit, its weight is measured, and a weight signal based on the measurement result is transmitted to a remote measurement management building.
A weight measuring device is installed inside the measurement management building, and this weight measuring device measures, manages, and monitors the weight values of vehicles, loads and the like based on the transmitted weight signal.

In the conventional vehicle weight measurement system, between the weighing platform and the measurement management building, the power wiring for supplying power to each load cell and the transmission of information such as weight signals between each load cell and the weight measurement device are performed. Signal wiring is required at a minimum.
However, since the weighing platform and the measurement management building are usually several tens of meters, and in some cases, close to several hundred meters, wiring costs and wiring construction costs increase the cost of system construction.
Therefore, there is a demand for measures for eliminating the wiring between the load cell and the weight measuring device without power wiring and signal wiring.

  As a technique that can meet such a demand, for example, there is a technique proposed in Patent Document 1.

US Patent Application Publication No. 2004/0026135

  In the technique according to Patent Document 1, the load signals of the load cells positioned as slaves are collected by a wireless communication in the master controller, and the collected load signals are converted into wireless signals by the master controller to the weight measurement device in the measurement management building. And is to be transmitted.

  By the way, in the technique which concerns on patent document 1, the master controller and the load cell are respectively arrange | positioned below the ground surface so that it may be pinched | interposed between a pit and a mounting base. Further, a battery as a power supply source is incorporated in the main body portion of the load cell, and an antenna for wireless communication with the master controller is attached.

For this reason, the technique according to Patent Document 1 has problems as described in the following (1) to (4).
(1) The replacement work of the battery incorporated in the load cell body cannot be easily performed.
(2) When the load cell is submerged, the antenna attached to the load cell main body is also submerged, so that the wireless communication between the load cell and the master controller cannot be performed normally. As a result, the wireless communication between the load cell and the weight measuring device is difficult. become.
(3) Since cleaning work such as wiping off dirt attached to the antenna attached to the load cell body cannot be easily performed, wireless communication between the load cell and the master controller cannot be normally performed due to accumulation of such dirt. As a result, wireless communication between the load cell and the weight measuring device becomes difficult.
(4) Since radio waves from the master controller are blocked by the pit and the platform, wireless communication with the weight measuring device becomes difficult.

  The present invention has been made in view of such problems, and can maintain a normal wireless communication environment between the load cell and the weight measuring device and can easily perform maintenance related to power supply to the load cell. An object of the present invention is to provide a vehicle weight measurement system.

In order to achieve the above object, a vehicle weight measurement system according to the present invention comprises:
From a weighing platform in which a platform on which a vehicle can be mounted is supported by a load cell, an antenna excitation signal conversion circuit that converts a weight signal output from the load cell into an antenna excitation signal, and the antenna excitation signal conversion circuit In a vehicle weight measurement system comprising: an antenna that radiates an antenna excitation signal as a radio wave; and a power supply device that supplies power to the load cell.
The load cell includes a strain generating portion, a load measuring circuit, and the antenna excitation signal conversion circuit arranged in an airtight chamber hermetically enclosed by a sealing case, and includes an airtight chamber and a waterproof chamber disposed adjacent to the airtight chamber. A power conduction pin for connecting a power wiring for supplying power to the load measuring circuit and the antenna excitation signal conversion circuit, and an antenna excitation signal output from the antenna excitation signal conversion circuit, on an airtight terminal for airtightly partitioning the space Ri Na and the signal conducting pins for connecting the antenna signal lines are provided,
And the antenna, and a power supply unit for supplying power to the load measuring circuit and the antenna excitation signal conversion circuit, Ru provided on-site control panel for remote communication relay launch with the installed weight signals from the ground surface It is characterized by this .

  According to the present invention, since the antenna for wireless communication between the load cell and the weight measuring device is installed on the ground surface outside the weighing table, the wireless communication environment between the load cell and the weight measuring device can be kept normal. it can. In addition, since the power supply device that supplies power to the load cell is installed on the ground surface outside the weighing platform, maintenance related to power supply to the load cell can be easily performed.

1 is an overall schematic configuration diagram of a vehicle weight measurement system according to a first embodiment of the present invention. It is structure explanatory drawing (a) of the load cell applied in the vehicle weight measuring system which concerns on 1st Embodiment, and the A section enlarged view (b) of (a). It is a block diagram of the electric circuit of the load cell applied in the vehicle weight measurement system which concerns on 1st Embodiment. It is a whole schematic block diagram of the vehicle weight measurement system which concerns on the 2nd Embodiment of this invention.

  Next, specific embodiments of the load cell according to the present invention will be described with reference to the drawings.

[First Embodiment]
A vehicle weight measurement system 1 shown in FIG. 1 includes a weighing platform 2, an on-site control panel 3, and a weight measurement device 4.

The weighing platform 2 is incorporated in a concrete pit 6 formed by digging down the ground surface 5.
The weighing platform 2 includes a platform 7 made of a steel rectangular plate on which a vehicle such as a truck (not shown) can be placed, and four load cells 8 (two) supporting the four corners of the platform 7 from below. Only shown.).

The on-site control panel 3 is installed on the ground surface 5 outside the weighing platform 2 at a place where the driver of the vehicle can easily operate. The field control panel 3 is preferably installed as close to the weighing platform 2 as possible in order to shorten the wiring with each load cell 8.
A solar cell panel 9 is attached to the head of the on-site control panel 3 so that necessary voltage and current can be obtained by connecting a plurality of solar cells that convert light energy into electric power. A power storage device 10 such as a secondary battery or a capacitor (capacitor) that stores the generated power is stored in the field control panel 3. The solar cell panel 9 and the power storage device 10 constitute a power supply device 11 having a private power generation function. Instead of the power supply device 11, a power supply device such as a normal primary battery or secondary battery, or a fuel cell that extracts electric power by an electrochemical reaction can be used.
Four antennas 12 are attached to the side surface of the site control panel 3 in accordance with the number (4) of load cells 8 installed.

The weight measuring device 4 is installed in a measurement management building 13 that is built at a remote location from the weighing table 2. An antenna 14 is installed in the measurement management building 13.
The weight measuring device 4 includes an antenna excitation signal conversion circuit 15 and an arithmetic circuit 16.
The antenna excitation signal conversion circuit 15 converts the output signal from the arithmetic circuit 16 into an antenna excitation signal, or a digital arithmetic signal that can be arithmetically processed by the arithmetic circuit 16 from the signal acquired from the antenna 14 via the antenna signal wiring 17. Or convert to
The arithmetic circuit 16 executes arithmetic processing for measuring, managing, and monitoring the weight value of a vehicle or a load based on the digital arithmetic signal from the antenna excitation signal conversion circuit 15.
As for the power supply of the weight measuring device 4, AC power is introduced into the weight measuring device 4 via the branch AC wire 18 a from the AC wire 18 installed near the measurement management building 13.

Each antenna 12 attached to the on-site control panel 3 and each load cell 8 that supports the stage 7 are connected by an antenna signal wiring 19.
Thus, the antenna excitation signal from each load cell 8 can be radiated from each antenna 12 as a radio wave.

In the pit 6 below the mounting base 7, a waterproof specification wiring connection terminal box 20 serving as a relay terminal for wiring is disposed.
The wiring connection terminal box 20 and the power storage device 10 include a first power wiring 21 comprising a pair of first power plus wiring 21a and first power minus wiring 21b (for convenience of explanation, one line in FIG. Connected by).
The wiring connection terminal box 20 and each load cell 8 include a second power wiring 22 comprising a pair of second power plus wiring 22a and second power minus wiring 22b (for convenience of explanation, one line in FIG. Connected by).
Thus, the power from the power storage device 10 can be supplied to each load cell 8 via the first power wiring 21, the wiring connection terminal box 20, and the second power wiring 22.

  Here, the antenna signal wiring 19, the second power plus wiring 22a, and the second power minus wiring 22b are, as shown in FIGS. 2A and 2B, one waterproof specification that can include these wirings. It is housed in a shielded cable 25.

  Next, the detailed structure of the load cell 8 will be described with reference to FIGS.

  As shown in FIG. 2A, the load cell 8 is a column type load cell, and includes an elastic body 30 and a load cell main body 31.

The elastic body 30 is made of a metal such as an aluminum alloy or stainless steel, and has a substantially cylindrical shape.
The elastic body 30 is arranged upright with its axis line oriented in the vertical direction, and has a strain-generating part 30a at the center in the axial direction. The strain generating portion 30 a generates a strain corresponding to a load from the mounting table 7 acting on one end side of the elastic body 30.

  The load cell main body 31 includes a sealing case 32 and a waterproof structure 33 provided continuously to the sealing case 32.

The sealing case 32 is an airtight structure in which a required metal plate-like member is airtightly welded and has a substantially cylindrical shape in appearance, and has an airtight chamber 34 inside.
An elastic body 30 is incorporated in the sealing case 32 so that one end portion and the other end portion of the elastic body 30 are exposed from the sealing case 32 and the strain-generating portion 30 a is accommodated in the airtight chamber 34.
The hermetic chamber 34 is filled with dry gas (for example, nitrogen gas) in order to prevent dew condensation due to temperature difference.

  The waterproof structure 33 mainly includes a connector guide metal fitting 35, a connector case 36, and a waterproof sealing metal fitting 37.

  As shown in FIG. 2B, the connector guide fitting 35 has a hollow portion 35a into which an airtight terminal 41 described later can be incorporated. One end of the connector guide fitting 35 is fitted into an opening 32a formed on the side surface of the sealing case 32, and is hermetically welded to the periphery of the opening 32a.

The connector case 36 is formed so as to partition the first hollow portion 36a formed at one end portion, the second hollow portion 36b formed at the other end portion, and the first hollow portion 36a and the second hollow portion 36b. A partition wall portion 36c, and a cable insertion hole 36d formed in the partition wall portion 36c. One end of the connector case 36 is screwed to the other end of the connector guide fitting 35 with a rubber packing 38 interposed between the connector case 36 and the connector guide fitting 35.
In the connector case 36, the shield cable 25 is inserted into the cable insertion hole 36d, and a rubber packing 39 that is externally fitted to the shield cable 25 is incorporated in the second hollow portion 36b.
A waterproof sealing metal fitting 37 is screwed to the other end portion of the connector case 36 so as to press the rubber packing 39 against the partition wall portion 36c. By tightening the waterproof sealing metal fitting 37, the connector case 36 and the shield cable 25 are tightened. Are sealed by the rubber packing 39.

  In this way, the waterproof chamber 40 that is continuous with the hermetic chamber 34 is formed by the hollow portion 35 a of the connector guide fitting 35 and the first hollow portion 36 a of the connector case 36.

  An airtight terminal 41 that airtightly partitions the airtight chamber 34 and the waterproof chamber 40 is disposed in the hollow portion 35 a of the connector guide fitting 35. The hermetic terminal 41 can prevent the dry gas sealed in the hermetic chamber 34 from leaking to the outside.

The airtight terminal 41 mainly includes a metal plate-like frame 42, a plate-like base material 43, a signal conduction pin 44, a power conduction anode pin 45a, and a power conduction cathode pin 45b that are arranged in parallel with each other at a predetermined interval. It is comprised by.
The metal plate frame 42 is hermetically welded to the inner peripheral surface of the connector guide fitting 35.
The plate-like base material 43 is assembled in an airtight manner to the metal plate-like frame 42. As the constituent material of the plate-like base material 43, a material such as glass or ceramic having high insulating properties, no air permeability, and a property that hardly deteriorates even during continuous use is suitably used.
The signal conducting pin 44, the power conducting anode pin 45a, and the power conducting cathode pin 45b are all plate-like substrates with one end facing the airtight chamber 34 and the other end facing the waterproof chamber 40. 43 is implanted in an airtight manner.
In the following, when the power conduction anode pin 45a and the power conduction cathode pin 45b are collectively referred to, they are simply referred to as “power conduction pin 45”.

A shield cable 25 is introduced into the waterproof chamber 40. The shield cable 25 accommodates an antenna signal wiring 19, a second power plus wiring 22a, and a second power minus wiring 22b.
The antenna signal wiring 19 in the shield cable 25 is connected to the other end side of the signal conduction pin 44 in the airtight terminal 41.
The second power plus wiring 22 a in the shield cable 25 is connected to the other end side of the power conduction anode pin 45 a in the airtight terminal 41.
The second power minus distribution 22b line in the shielded cable 25 is connected to the other end side of the power conducting cathode pin 45b in the airtight terminal 41.
In this way, by introducing the shield cable 25 into the waterproof chamber 40 and connecting it to the airtight terminal 41, it is possible to reliably prevent moisture from adhering to the wiring connection portion of the airtight terminal 41, and to prevent short circuit and mutual transmission signal transmission. It is possible to prevent the occurrence of interference.

  As shown in FIG. 2A, the hermetic chamber 34 has at least four strain gauges 46 (only two are shown in FIG. 2) attached to the strain generating portion 30a and required electronic components. A printed circuit board 47 to be assembled is accommodated.

  Next, an electric circuit 50 constructed by electronic components assembled to at least four strain gauges 46 and printed circuit board 47 attached to the strain generating portion 30a will be described with reference to the block diagram of FIG. To do.

  The electric circuit 50 shown in the block diagram of FIG. 3 includes a load measurement circuit 51, an antenna excitation signal conversion circuit 52, and a voltage converter 53.

The load measuring circuit 51 mainly includes at least four strain gauges 46, an operational amplifier 54, an A / D converter 55, an input / output circuit 56, a microprocessor (MPU) 57, and a memory 58. ing.
In the load measuring circuit 51, a bridge circuit 59 is constructed by at least four strain gauges 46. The bridge circuit 59 outputs an analog load signal according to the strain generated in the strain generating section 30a.
The analog load signal from the bridge circuit 59 is introduced into the operational amplifier 54 via the first board connector 61 provided at one end of the printed board 47, and the analog load signal amplified by the operational amplifier 54 is A The digital load signal is converted into a digital load signal by the / D converter 55, and this digital load signal is sent to the MPU 57 via the input / output circuit 56.
The MPU 57 reads a predetermined program and a span coefficient written in the memory 58, reads a digital load signal from the input / output circuit 56, calculates a weight value according to the predetermined program, and outputs a weight signal based on the calculation result. . The signal output from the MPU 57 can include not only a weight signal based on a calculation result but also an alarm signal based on a load signal.
The weight signal from the MPU 57 is sent to the input / output circuit 56 to be converted into a serial signal, and the weight signal converted into the serial signal is sent to the antenna excitation signal conversion circuit 52.

The antenna excitation signal conversion circuit 52 has a function of converting a weight signal converted into a serial signal from the MPU 57 via the input / output circuit 56 into a high-frequency antenna excitation signal, and via a printed wiring on the printed circuit board 47. The input / output circuit 56 and the second board connector 62 provided at the other end of the printed circuit board 47 are respectively connected.
Further, the antenna excitation signal conversion circuit 52 is connected from the second board connector 62 to the one end side of the signal conduction pin 44 in the airtight terminal 41 through the antenna signal wiring 63.

The voltage converter 53 converts the voltage of the supplied power into a voltage necessary for the circuit and outputs the voltage. The voltage converter 53 outputs the voltage to the load measurement circuit 51 and the antenna excitation signal conversion circuit 52 via the printed wiring on the printed circuit board 47. It is connected so that power can be supplied.
The voltage converter 53 is connected to the second board connector 62 via a printed wiring on the printed board 47.
Further, the voltage converter 53 is connected from the second board connector 62 to the one end side of the power conduction anode pin 45a in the airtight terminal 41 through the power plus wiring 64a and from the second board connector 62 to the power minus wiring 64b. Is connected to one end side of the power conducting cathode pin 45 b in the airtight terminal 41.
Hereinafter, when the power plus wiring 64a and the power minus wiring 64b are generically expressed, they are simply referred to as “power wiring 64”.

In the vehicle weight measurement system 1 of this embodiment, the antenna excitation signal from the antenna excitation signal conversion circuit 52 shown in FIG. 3 is transmitted from the second board connector 62 to the airtight terminal 41 via the antenna signal wiring 63. 1 is transmitted to the antenna 12 attached to the on-site control panel 3 through the antenna signal wiring 19 shown in FIG. 1 and radiated as a radio wave, and wirelessly directed toward the antenna 14 attached to the weight measuring device 4. Sent.
On the contrary, the antenna excitation signal wirelessly transmitted from the antenna 14 attached to the weight measuring device 4 is received by the antenna 12 attached to the on-site control panel 3 and from the antenna signal wiring 19 connected to the antenna 12. 3 is transmitted to the antenna excitation signal conversion circuit 52 via the signal conduction pin 44 of the airtight terminal 41, the antenna signal wiring 63 and the second board connector 62 shown in FIG. After being converted into a signal, it is read into the MPU 57 via the input / output circuit 56.

  Further, in the vehicle weight measurement system 1 of the present embodiment, the electric power from the power storage device 10 shown in FIG. 1 is supplied via the first power wiring 21, the wiring connection terminal box 20, and the second power wiring 22 as shown in FIG. Is supplied to the power conduction pin 45 of the hermetic terminal 41 shown in FIG. 2 and is supplied from the power conduction pin 45 to the voltage converter 53 via the power wiring 64 and the second board connector 62. After being converted to a correct voltage, it is supplied to the load measuring circuit 51 and the antenna excitation signal converting circuit 52.

According to the vehicle weight measuring system 1 of the present embodiment, it is possible to eliminate the wiring between the load cell 8 and the weight measuring device 4 as described in the following (1) to (8). There are the following effects.
(1) Since there are no obstacles that block radio waves radiated from the antenna 12, wireless communication between the load cell 8 and the weight measuring device 4 can be performed normally.
(2) The antenna 12 is free from being submerged and can be easily wiped off even if dirt or the like adheres to the antenna 12. Therefore, communication failure caused by the antenna 12 submerged or dirt or the like attached to the antenna 12. Can be prevented in advance.
(3) When the solar cell panel 9 is used, a sufficiently large panel can be used, so that large power can be obtained.
(4) When a fuel cell is used as the power supply device instead of the power supply device 11, fuel such as alcohol and hydrogen can be easily supplied.
(5) When a normal primary battery or secondary battery is used as the power supply device instead of the power supply device 11, battery replacement and charging work can be easily performed.
(6) Since the distance between the antenna 12 and the load cell 8 and the distance between the power supply device 11 and the load cell 8 are both short, the wiring cost can be kept low.
(7) Since the hermetic terminal 41 that hermetically partitions the hermetic chamber 34 and the waterproof chamber 40 includes both the signal conducting pin 44 and the power conducting pin 45, the hermetic terminal 41 is connected to the load cell main body 31. The antenna 12 and the power supply device 11 can be connected to the electric circuit 50 in the hermetic chamber 34 in an airtight state only by being provided at one place, and the sealing structure can be simplified.
(8) Since the antenna signal wiring 19, the second power plus wiring 22a, and the second power minus wiring 22b are housed in one shielded cable 25 and introduced into the load cell 8, the wiring structure can be simplified. it can.

[Second Embodiment]
Next, a vehicle weight measurement system according to a second embodiment of the present invention will be described with reference to FIG.
In the vehicle weight measurement system 1A of the present embodiment, the same or similar components as those of the vehicle weight measurement system 1 of the first embodiment are given the same reference numerals in the drawings, and detailed descriptions thereof are omitted. The following description will focus on differences from the vehicle weight measurement system 1 of the first embodiment.

In the vehicle weight measurement system 1 </ b> A shown in FIG. 4, the field control panel 3 is equipped with a push button switch 70, a display lamp 71, an IC card insertion slot 72, and a controller 73.
The push button switch 70 has a function of transmitting an operation signal for determining the weight signal from the load cell 8 as a weight measurement value to the controller 73.
The display lamp 71 is a low power consumption type display lamp made of LED, for example, and displays the contents of an alarm or displays the meaning of permitting the vehicle to leave the weighing platform 2.
An IC card storing vehicle information such as a vehicle number and vehicle load is inserted into the IC card insertion slot 72. The controller 73 mainly includes an arithmetic circuit 74, an antenna excitation signal conversion circuit 75, and an IC card read / write device 76. (Corresponding to “vehicle information recognition means” of the present invention).
The arithmetic circuit 74 has a function of executing predetermined arithmetic processing based on measurement information including vehicle information.
The antenna excitation signal conversion circuit 75 has a function of converting a signal between the antenna excitation signal and the digital operation signal.
The IC card read / write device 76 has a function of reading vehicle information written on the IC card and recognizing the contents, or writing new information on the IC card.
The controller 73 and the power storage device 10 are connected by a power wiring 77, and power is supplied from the power storage device 10 to the controller 73 via the power wiring 77. Further, power is supplied from the controller 73 to the display lamp 71 together with the display signal.

The antenna excitation signal conversion circuit 75 in the controller 73 is connected to the wiring connection terminal box 20 via the first serial signal wiring 81. The second serial signal wiring 82 connected to the first serial signal wiring 81 through the wiring connection terminal box 20 is housed in one shielded cable 25 together with the second power plus wiring 22a and the second power minus wiring 22b. It is introduced into the waterproof chamber 40 of each load cell 8 (see FIG. 2B), and is connected to the other end side of the signal conduction pin 44 in the airtight terminal 41. The first serial signal wiring 81 and the second serial signal wiring 82 correspond to the “weight signal wiring” of the present invention.
The antenna excitation signal conversion circuit 75 in the controller 73 is connected to the antenna 12 attached to the site control panel 3 via the antenna communication wiring 83.

In the vehicle weight measurement system 1A of the present embodiment, an electric circuit similar to the electric circuit 50 (see FIG. 3) used in the vehicle weight measurement system 1 of the first embodiment is employed. The point is different. That is, the weight signal converted into a serial signal from the MPU 57 through the input / output circuit 56 in FIG. 3 is for the second board without passing through the antenna excitation signal conversion circuit 52 as indicated by the dotted line B in FIG. The signal is sent from the connector 62 to the signal conduction pin 44 in the airtight terminal 41 through the serial signal wiring 84.
The weight signal transmitted to the signal conduction pin 44 is an antenna excitation signal in the controller 73 via the second serial signal wiring 82, the wiring connection terminal box 20 and the first serial signal wiring 81 shown in FIG. The signal is transmitted to the conversion circuit 75, converted into the antenna excitation signal by the antenna excitation signal conversion circuit 75, then transmitted to the antenna 12 through the antenna communication wiring 83, radiated as a radio wave from the antenna 12, and measured in the measurement management building 13. The signal is received by the antenna 14 attached to and transmitted to the weight measuring device 4. Note that the signal sent from the load cell 8 to the weight measuring device 4 via the controller 73 can include an alarm signal or the like issued when the load cell 8 is abnormal, in addition to the weight signal.
Information from the weight measuring device 4 is converted into an antenna excitation signal by the antenna excitation signal conversion circuit 15 in the weight measuring device 4 and radiated as a radio wave from the antenna 14 attached to the measurement management building 13. And is converted into a digital calculation signal through an antenna excitation signal conversion circuit 75 provided in the controller 73 and read by the calculation circuit 74 provided in the controller 73 as well.

  In the vehicle weight measurement system 1A of the present embodiment, the weight signal of the load cell 8, the abnormality alarm signal, the vehicle information read from the IC card, etc. are converted into the antenna excitation signal by the antenna excitation signal conversion circuit 75 of the controller 73 and are subjected to on-site control. It is wirelessly transmitted to the weight measuring device 4 through the antenna 12 attached to the panel 3. On the contrary, the information on the weight of the vehicle load obtained by the weight measuring device 4, the information meaning to allow the weight measurement of the vehicle, and the information to permit the exit from the weighing table 2 are the weight measurement. In some cases, the apparatus 4 may wirelessly transmit to the controller 73 in the field control panel 3. In this case, the information from the weight measuring device 4 is converted into an antenna excitation signal by the antenna excitation signal conversion circuit 15 in the weight measuring device 4 and radiated as a radio wave from the antenna 14 attached to the measurement management building 13. The signal is received by the antenna 12 attached to the control panel 3, converted into a digital calculation signal through the antenna excitation signal conversion circuit 75 in the controller 73, and then taken into the calculation circuit 74. It should be noted that the load information on the vehicle load taken into the arithmetic circuit 74 is recorded on the IC card by the IC card read / write device 76 as necessary.

Further, in the vehicle weight measurement system 1A of the present embodiment, the controller 73 has a function of determining a weight signal from the load cell 8 as a weight measurement value by a push operation of the push button switch 70. A weight measurement can be established. It should be noted that a signal generated by the pressing operation of the push button switch 70, that is, an operation signal for determining a weight signal from the load cell 8 as a weight measurement value is wirelessly transmitted to the weight measuring device 4 via the controller 73. .
The controller 73 outputs to the display lamp 71 a display signal indicating an instruction to the worker, an alarm, permission to leave based on signals from the weight measuring device 4 or the load cell 8. As a result, it is possible to display on the display lamp 71 the content meaning an instruction or warning to the operator, or display the content on the display lamp 71 to allow the vehicle to leave the weighing platform 2. it can.

Needless to say, according to the vehicle weight measurement system 1A of the present embodiment, the same operational effects as those of the vehicle weight measurement system 1 of the first embodiment can be obtained.
Furthermore, according to the vehicle weight measurement system 1A of the present embodiment, the controller 73 functions not only as a means for wirelessly transmitting the information of the load cell 8, but also includes measurement information including vehicle information, operation signals, display signals, and the like. Since it is also used as processing means for processing and means for wirelessly transmitting the information and signals, the system can be multi-functionalized.

  As described above, the vehicle weight measurement system of the present invention has been described based on a plurality of embodiments. However, the present invention is not limited to the configurations described in the above-described embodiments, and the configurations thereof are appropriately made without departing from the spirit thereof. Can be changed.

For example, in the vehicle weight measurement system 1A according to the second embodiment, the controller 73 and the load cell 8 are provided with two types of wiring, that is, power wiring and serial communication wiring. There may be a mode in which a converter is mounted on each, a digital signal is converted into a high-frequency signal with respect to the power signal by the converter on the controller 73 side, superimposed on the power signal, and the power signal is connected only by the power wiring. .
In this case, a configuration in which the power signal and the digital high frequency signal are transmitted to the electric circuit 50 of the load cell 8 through the airtight terminal 41 is adopted. In the electric circuit 50 of the load cell 8, the supplied electric power is converted into a voltage required for the circuit by the converter, and the digital high frequency signal is also converted into a digital arithmetic signal that can be processed by the arithmetic circuit by the converter. The weight signal from the load measuring circuit 51 is converted into a high frequency signal by the converter, superimposed on the power signal of the power wiring, and transmitted to the controller 73 side through the airtight terminal 41.

  The vehicle weight measurement system of the present invention has characteristics that the wireless communication environment between the load cell and the weight measurement device can be kept normal, and maintenance related to power supply to the load cell can be easily performed. Therefore, it can be suitably used for the application of a weighing system that manages the weighing content on the pit type truck scale with the weight measuring device installed in the measurement management building.

DESCRIPTION OF SYMBOLS 1,1A Vehicle weight measuring system 2 Weighing base 3 Site control apparatus 4 Weight measuring apparatus 5 Ground surface 6 Pit 7 Mounting stage 8 Load cell 9 Solar cell panel 10 Power storage apparatus 11 Power supply apparatus 12, 14 Antenna 15, 52, 75 Antenna excitation signal Conversion circuit 19, 63, 83 Antenna signal wiring 21, 22, 64, 77 Power wiring 25 Shielded cable 76 IC card read / write device (vehicle information recognition means)
73 Controller 81, 82, 84 Serial communication wiring (weight signal wiring)

Claims (1)

From a weighing platform in which a platform on which a vehicle can be mounted is supported by a load cell, an antenna excitation signal conversion circuit that converts a weight signal output from the load cell into an antenna excitation signal, and the antenna excitation signal conversion circuit In a vehicle weight measurement system comprising: an antenna that radiates an antenna excitation signal as a radio wave; and a power supply device that supplies power to the load cell.
The load cell includes a strain generating portion, a load measuring circuit, and the antenna excitation signal conversion circuit arranged in an airtight chamber hermetically enclosed by a sealing case, and includes an airtight chamber and a waterproof chamber disposed adjacent to the airtight chamber. A power conduction pin for connecting a power wiring for supplying power to the load measuring circuit and the antenna excitation signal conversion circuit, and an antenna excitation signal output from the antenna excitation signal conversion circuit, on an airtight terminal for airtightly partitioning the space Ri Na and the signal conducting pins for connecting the antenna signal lines are provided,
And the antenna, and a power supply unit for supplying power to the load measuring circuit and the antenna excitation signal conversion circuit, Ru provided on-site control panel for remote communication relay launch with the installed weight signals from the ground surface A vehicle weight measurement system.

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