JP2007127234A - Status detection device using radio tag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a status detection device using a radio tag capable of performing the detection of the status of valve opening/closing or the like by radio. <P>SOLUTION: The status detection device using the radio tag of the present invention is provided with the radio tag provided on a movable member of a status switching device; and a shutting-off member provided in at least a movable range of the movable member, arranged between the radio tag and a radio tag reading device and disabling communication of the radio tag and the radio tag reading device. The status switching device includes an opening/closing device of a valve on a vehicle, an opening/closing device of a valve of a facility in a factory plant or the like. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a state detection device using a wireless tag, and more particularly to a state detection device using a wireless tag in a wireless tag reading system using a UHF band (300 MHz band to 3,000 MHz band).

Conventionally, a reading system using a wireless tag is known. For example, in (Patent Document 1), a wireless tag storing opening / closing operation direction information and shut-off torque information is attached to an underground burying valve, gate valve, gas valve, etc. installed in a water pipe network, etc. It is disclosed that the convenience of an operator is improved by opening and closing a valve with a wireless tag using a valve operating device including means and a drive motor.
JP 2003-139268 A

  However, in a conventional system for detecting the opening / closing state of a valve using a wireless tag, a special operating device having a wireless tag reading means is required, and this operating device is used close to the wireless tag. There is no degree of freedom in the system, and the advantage of the wireless tag that remote state detection is performed is not utilized. Further, in the conventional system, the wireless tag is attached to a fixed object, and there is a problem that it cannot cope with a moving body.

  In addition, conventional state detection systems using wireless tags are not limited to opening / closing of valves, but state detection such as opening / closing of doors, locks of safes, etc. is performed by automatic opening / closing devices or electronic locks whose opening / closing means are linked to wireless tags. Although it is effective for new facilities and equipment that can automate the opening and closing and locking of these, it is difficult to install and operate an automatic switching device for existing facilities. there were. In particular, it is expensive to introduce new equipment for a vehicle, ship, plant, or the like that has a huge equipment cost. In addition, depending on the equipment, a manual opening / closing device may be indispensable to cope with an emergency, and there is a situation where automation itself is impossible.

  Therefore, an object of the present invention is to provide a state detection device using a wireless tag that can detect a state such as opening / closing of a valve wirelessly.

  In order to achieve the above object, a state detection device using a wireless tag of the present invention includes a wireless tag provided on a movable member of the state switching device and at least a movable range of the movable member. It was set as the structure provided with the shielding member which is arrange | positioned between readers and makes communication with a wireless tag and a wireless tag reader impossible.

  The present invention can detect the state of the state switching device wirelessly.

(Embodiment 1)
FIG. 1 is a schematic diagram showing an opening / closing device including a wireless tag according to Embodiment 1 of the present invention. In FIG. 1, 1 is a wireless tag, 2 is a shielding plate, 21 is a support member, 3 is a handle, and 10 is an opening / closing device.

  As shown in FIG. 1, the opening / closing device 10 includes a handle 3 as a movable member. By rotating the handle 3 left and right, for example, a valve is opened and closed, and fluid is controlled by opening and closing the valve. By this fluid control, for example, the fluid itself is discharged, and braking and release by a hydraulic brake are performed. The relationship between the movement of the handle 3 and the final control varies depending on the system to which this mechanism is applied. Can take.

  The handle 3 is provided with a wireless tag 1, and the shielding plate 2 is attached by a support member 21 so that the wireless tag 1 can be covered at a specific position on the circumference of the handle 3. Worn. The position of the shielding plate 2 as the shielding member is fixed and does not move as the handle 3 rotates. That is, the support member 21 that supports the shielding plate 2 is fixed to a portion of the opening / closing device 10 that does not follow the rotation of the handle 3. The shielding plate 2 may be arranged by the support member 21 other than the opening / closing device 10, for example, in a facility where the opening / closing device 10 is installed, as long as the shielding plate 2 can cover the specific position without hindering the rotation of the handle 3. .

  The relationship between the shielding plate 2 and the wireless tag 1 will be described. Although the wireless tag 1 moves with the rotation of the handle 3, communication with a wireless tag reader (100) described later is possible at a position where the shielding plate 2 does not exist. That is, communication cannot be performed at a position covered by the shielding plate 2. As the shielding plate 2, a material that shields radio waves from the wireless tag 1, for example, a metal may be used.

  2 and 3 are explanatory plan views showing the switchgear including the wireless tag according to Embodiment 1 of the present invention.

  FIG. 2 shows a state where the wireless tag 1 provided on the handle 3 is present at a position not covered by the shielding plate 2, and communication with the wireless tag reader (100) is possible in this state. .

  As shown in FIG. 3, when the wireless tag 1 reaches the back surface of the shielding plate 2 by turning the handle 3, the wireless tag 1 is present at a position covered by the shielding plate 2. In this state, the wireless tag 1 is located. Communication with the reader (100) becomes impossible.

  For example, the state of the handle 3 in FIG. 3 is a “closed” position in the opening and closing device 10, and the position of the handle 3 is set from this position by setting the position of the shielding plate 2 and the wireless tag 1 to coincide with that position. Is rotating, it is at least “open”, not “closed”. This can be distinguished from a state in which the wireless tag 1 cannot communicate and a state in which communication is possible. In the example of FIGS. 2 and 3, if the rotation of the handle 3 is less than one rotation (strictly speaking, even if the handle 3 is fully rotated to the open side, it does not enter the region of the shielding plate 2). A distinction can be made between “closed” and “open”. Further, even when the handle 3 is rotated once or more, a protrusion is provided slightly ahead in the rotation direction at the position where the wireless tag 1 of the handle 3 is provided, so that the shielding plate 2 can be rotated, and the handle 3 is rotated one or more times. In this case, if the projection is configured to push the shielding plate 2 from the circumference of the handle 3, the wireless tag 1 is shielded by the shielding plate 2 between “closed” and other “open” states. It is possible to distinguish between the two states that communication by the wireless tag 1 can be performed and communication by the wireless tag 1 due to the absence of the shielding plate 2.

  Here, FIG. 4 and FIG. 5 are plan explanatory views showing other examples of the opening / closing device including the wireless tag according to Embodiment 1 of the present invention. Further, FIG. 6 is an explanatory side view showing another example of the opening / closing device including the wireless tag according to Embodiment 1 of the present invention. 2a is a shielding plate.

  This example is different from the state described with reference to FIGS. 2 and 3 in a state where the shielding plate 2a always covers other than the specific position and the shielding plate 2a does not exist only at the specific position.

  In the state shown in FIG. 4, the wireless tag 1 is covered with the shielding plate 2a, and communication with the wireless tag reader (100) is impossible in this state. On the contrary, in the state shown in FIG. 5, since the wireless tag 1 provided on the handle 3 is present at a position not covered by the shielding plate 2a, communication with the wireless tag reader (100) is possible in this state. is there.

  As shown in FIG. 6, the shielding plate 2 a is fixed by the support member 21 and is disposed in a state that does not hinder the rotation of the handle 3.

(Embodiment 2)
7 and 8 are schematic explanatory views showing an opening / closing device including a wireless tag according to Embodiment 2 of the present invention. Reference numeral 4 denotes a lever.

  As shown in FIGS. 7 and 8, the opening / closing device 10 includes a lever 4. By rotating the lever 4, for example, a valve is opened and closed, and fluid is controlled by opening and closing the valve.

  The lever 4 is provided with the wireless tag 1, and the shielding plate 2 is attached to the opening / closing device 10 so that the lever 4 can be covered when the lever 4 is moved to the position shown in FIG. 8. It has been.

  At positions other than those shown in FIG. 8, for example, the position of FIG. 7 in the initial state, since the shielding plate 2 does not exist, communication with the wireless tag reader (100) is possible.

  When the wireless tag 1 reaches the back surface of the shielding plate 2 by turning the lever 4, the wireless tag 1 is present at a position covered by the shielding plate 2. In this state, the wireless tag reader (100) Communication with is impossible.

  Thus, also in the switchgear according to the second embodiment, the state change can be read as the communication state change of the wireless tag 1.

  Thus, as shown in the first and second embodiments, the wireless tag 1 is provided to the opening / closing device 10 provided in various facilities, and the shielding plate 2 is simply installed to open / close. A change in the state of the device 10 can be detected remotely (wirelessly). Further, by supplying power to the wireless tag 1 by the wireless tag reader (100), the wireless tag 1 is small and thin, and the cost can be reduced.

  In the first and second embodiments, the switching device 10 is exemplified as a device that opens and closes a valve. However, a contact switch, a screw-type lock, or the like may be used regardless of the valve. In any case, if the state is switched by the movement of the opening / closing device 10 and the communication tag is linked by the combination of the wireless tag 1 and the shielding plate 2, it is used for various switches and driving mechanisms. be able to. That is, the opening / closing device 10 is not limited to opening / closing, and may be any device that changes state.

  Next, usage examples of the state detection device using the wireless tag of the present invention will be described in the following embodiments.

(Embodiment 3)
FIG. 9 is a schematic explanatory diagram showing a system using an opening / closing device including a wireless tag according to Embodiment 3 of the present invention.

  As shown in FIG. 9, the opening / closing device 10 described in the first embodiment or the second embodiment is attached to the opening / closing mechanism of the discharge port of the tank lorry, and the wireless tag reader 100 and the wireless tag 1 provided in the opening / closing device 10 are used. It is an example of the system which communicates with.

  For example, communication between the wireless tag reader 100 and the wireless tag 1 confirms whether or not the opening / closing device 10 has been forgotten to be closed or is securely closed after the system is installed at a gas station and gasoline is discharged from the tank lorry. The state is detected by whether or not. This information may be displayed from the wireless tag reader 100 by a display device installed at a gas station, and may be confirmed by the driver's visual recognition.

  In addition, when combined with other equipment, such as a tank lorry automatic tire stopping system, first, when discharging gasoline, etc., the automatic tire stopper works on the tank lorry (raised from the ground). Close the switchgear 10 after discharging is completed. When the state where the opening / closing device 10 is securely closed is detected based on whether the wireless tag 1 and the wireless tag reader 100 can communicate with each other, this information is transmitted from the wireless tag reader 100 to the automatic tire stopping system, The tire stop can be released (buried from the ground).

  Here, communication processing between the wireless tag 1 provided in the opening / closing device 10 and the wireless tag reader 100 will be described below. However, the following processing is an example, and processing may be performed by other known methods. Good.

  The wireless tag reader 100 has a transmission circuit, a reception circuit, and an antenna unit. The antenna unit has a transmission antenna and a reception antenna. One antenna having the functions of both antennas may be used. Further, the wireless tag reader 100 has a CPU (Central Processing Unit). The CPU performs synthesizer data setting, transmission data setting to the baseband filter, reception data output processing from the level conversion circuit, and the like. The synthesizer generates a carrier wave necessary for communication with the wireless tag 1. In the wireless tag reader 100, for example, the 850 MHz to 970 MHz band is used as the UHF band, but it is not particularly limited to this, and the 2.4 GHz band or the 400 MHz band may be used. In the case of a system having frequency hopping, various frequency components are generated by a synthesizer. About half the power of the synthesizer output is input to a modulator composed of transistors through an isolator. The remaining half of the power is input as a received local signal to the mixer of the receiving circuit through the 0/90 degree hybrid circuit. The 0/90 degree hybrid circuit is a power distributor that generates a 90 degree phase difference output signal.

  The transmission data filtered by the baseband filter is modulated with a carrier wave generated by a synthesizer in a modulator. The modulation output is amplified in a linear operation by a subsequent transmission amplifier, and further amplified in a linear operation by a subsequent power amplifier to a predetermined power level. The amplified modulated signal is freed of unnecessary spurious signals such as harmonics by a bandpass filter, and is output as a transmission signal from the transmission antenna.

  The radio waves emitted to the space lose some power due to propagation loss in the space, but are received by the antenna of the wireless tag 1 and generate power to start the CPU in the wireless tag 1 by rectifying operation by the rectenna. Is done. When the generated power reaches the power level for starting up the CPU, the modem demodulates the transmission signal from the wireless tag reader 100 and the CPU processes the signal. That is, the CPU accesses the memory and backscatter-modulates the information stored in the memory with the modem, thereby returning a response signal to the RFID tag reader 100 side through the antenna.

  The response signal from the wireless tag 1 is received as a received signal by the receiving antenna of the wireless tag reader 100 and input to the distributor via the isolator. Here, the received power is distributed in the same phase and input to the mixer. In the mixer, the signal is mixed by a local signal having the same frequency as the reception frequency having a phase difference of 90 degrees and directly converted into a baseband signal.

  Unnecessary frequency components are removed from the I and Q signal components converted into baseband signals by a filter. Thereafter, the power of the baseband signal is amplified to a required level by the receiving amplifier. The amplified baseband signal is synthesized in the same phase in an analog manner by a synthesis circuit. The synthesized baseband data is input to the level conversion circuit via the differentiation circuit, binarized by the level conversion circuit, and the received data is processed by the CPU. The input / output interface control unit receives a control signal or the like from an external PC (Personal Computer), for example.

  Note that the “wireless tag” in this specification refers to an identification code or the like stored in the wireless tag by performing wireless communication at a distance (for example, several millimeters to several meters) close to the wireless tag reader or reader / writer device. There are various types of media such as a label type, a card type, a coin type, a stick type, and a chip type. Therefore, the term “wireless tag” includes so-called RFID tags (Radio Frequency Identification tags), RF tags (Radio Frequency tags), IC tags (Integrated Circuit tags), wireless IC tags, electronic tags, and non-contact tags. included.

(Embodiment 4)
FIG. 10 is a schematic explanatory diagram showing a system using an opening / closing device including a wireless tag according to Embodiment 4 of the present invention.

  As shown in FIG. 10, the opening / closing device 10 described in the first or second embodiment is attached to a manual brake mechanism of a train car, and the wireless tag reader 100 and the wireless tag 1 provided in the opening / closing device 10 are provided. It is an example of the system which performs communication.

  For example, this system is installed in a train car garage, and the train car is fixed by applying a manual brake during maintenance of the train car. Then, after the maintenance is completed, whether or not the opening / closing device 10 has been forgotten to be closed or is surely closed is detected based on whether the wireless tag reader 100 and the wireless tag 1 can communicate with each other. This information is displayed from the wireless tag reader 100 by a display device installed in the driver's seat of the train car, and can be confirmed by the driver's visual recognition.

  As described above, as shown in the third or fourth embodiment, the switchgear 10 can be obtained simply by providing the wireless tag 1 and installing the shielding plate 2 for the switchgear 10 provided in various facilities. It is possible to detect the state change of the remote by wireless (wireless). In addition to those described in Embodiment 3 or Embodiment 4, the present invention can be used for various facilities such as an oil plant, a tanker, and a factory of each industry.

  The state detection device using the wireless tag according to the present invention is a wireless tag reading system using the UHF band (300 MHz to 3,000 MHz band) that needs to detect the state of opening and closing of the valve wirelessly. It is suitably used for a state detection device using a wireless tag.

Schematic which shows the switchgear provided with the wireless tag in Embodiment 1 of this invention Plane explanatory drawing which shows the switchgear provided with the wireless tag in Embodiment 1 of this invention Plane explanatory drawing which shows the switchgear provided with the wireless tag in Embodiment 1 of this invention Plane explanatory drawing which shows the other example of the switchgear provided with the wireless tag in Embodiment 1 of this invention Plane explanatory drawing which shows the other example of the switchgear provided with the wireless tag in Embodiment 1 of this invention Side surface explanatory drawing which shows the other example of the switchgear provided with the wireless tag in Embodiment 1 of this invention Schematic explanatory drawing which shows the switchgear provided with the wireless tag in Embodiment 2 of this invention Schematic explanatory drawing which shows the switchgear provided with the wireless tag in Embodiment 2 of this invention Schematic explanatory drawing which shows the system using the switchgear provided with the wireless tag in Embodiment 3 of this invention Schematic explanatory drawing which shows the system using the switchgear provided with the wireless tag in Embodiment 4 of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Wireless tag 2 Shielding plate 3 Handle 4 Lever 10 Opening / closing device 21 Support member 100 Wireless tag reader

Claims (5)

The wireless tag provided on the movable member of the state switching device, and provided at least within the movable range of the movable member, and disposed between the wireless tag and the wireless tag reader, so that the wireless tag and the wireless tag read A state detection apparatus using a wireless tag, comprising: a shielding member that disables communication with the apparatus. 2. The communication with the wireless tag reading device is not possible when the wireless tag provided on the movable member is positioned on the back surface of the shielding member due to the movement of the movable member. A state detection device using a wireless tag. The state detection device using a wireless tag according to claim 1, wherein the state switching device is a valve opening / closing device. The state detection device using a wireless tag according to claim 1, wherein the state switching device is a valve opening / closing device of a vehicle. The state detection device using a wireless tag according to any one of claims 1 and 2, wherein the state switching device is a valve opening / closing device of equipment of a factory plant.

Images