Antenna earth device for medium wave radio broadcasting apparatus

Abstract

To solve such a problem that, since a maintenance worker must connect an earth rod to a grounding wire each time in maintenance of a broadcasting apparatus, there is a possibility of forgetting to connect the earth rod to the grounding wire and performing work, and there is a possibility of electrical shock caused by lightning.SOLUTION: An antenna earth device for a medium wave radio broadcasting apparatus according to an embodiment is provided in an output section that supplies the output of the medium wave radio broadcasting apparatus to an antenna wire, and comprises: a grounding wire connected to the ground; an earth rod that is electrically connected to the antenna wire and rotates to be electrically connectable to the grounding wire; a drive unit that rotates the earth rod between a position connected to the grounding wire and a position separated from the grounding wire; a sensor that detects an angle of the earth rod; and a control unit that detects ON / OFF signals from the sensor and automatically controls the drive unit on the basis of the ON / OFF signals.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] An embodiment of the present invention relates to an antenna grounding device for a medium wave radio broadcasting device. [Background technology]

[0002] In medium wave radio broadcasting, the broadcasting equipment uses AM waves (Amplitude Modulation AM waves are supplied to the antenna to generate AM waves and transmit them to the designated broadcast service area. will be done.

[0003] By the way, the antenna of the medium wave radio broadcasting equipment is about 100m high, so it is difficult to prevent the influence of lightning strikes. For this reason, broadcasting equipment is equipped with a grounding rod, and maintenance of the equipment is During maintenance, maintenance workers must manually install the equipment before starting work to prevent electric shocks caused by lightning strikes. The earth rod is connected to the ground wire. The current caused by a lightning strike to the antenna passes through the earth rod. The current flows to the grounding wire. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Utility Model Application Publication No. 06-070326 [Patent Document 2] Japanese Patent Publication No. 2021-175346 Summary of the Invention [Problem to be solved by the invention]

[0005] In the conventional method described above, workers have to ground the earth rod each time during maintenance. Since it is necessary to connect the earth rod to the ground wire, there is a possibility that you may forget to connect the earth rod to the ground wire while working. There is.

[0006] In addition, Patent Document 1 discloses a method for preventing electric shock to maintenance workers from high voltage parts present in the power supply unit. Therefore, when the door switch is triggered (when the door is opened), the voltage in the high voltage section is discharged. The mechanism by which this is done is described.

[0007] Patent Document 2 describes safety measures to prevent workers from getting electric shock when conducting annual inspections of power facilities. A short-circuit grounding fitting is described which can be installed for this purpose.

[0008] Both are mechanisms for discharging high-voltage parts and preventing electric shock from lightning strikes. isn't it. [Means for solving the problem]

[0009] In order to solve the above problem, an antenna earth in a medium wave radio broadcasting device according to an embodiment is provided. The device is provided in an output section that supplies the output of a medium wave radio broadcasting device to an antenna line. The antenna is electrically connected to a ground wire and a rotating a ground rod that can be electrically connected to the ground wire by connecting the ground rod to the ground wire; a driving unit for rotating the earth rod between a connected position and a disconnected position; An angle sensor and an ON / OFF signal from the sensor are detected. and a control unit that automatically controls the drive unit based on an F signal. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a system block diagram of a grounding device according to a first embodiment. [Figure 2] FIG. 3 is an operation flow diagram of the grounding device according to the first embodiment. [Figure 3]3A to 3C are diagrams showing state changes of various parts accompanying the operation of the grounding device according to the first embodiment. [Figure 4] FIG. 6 is a system block diagram of a grounding device according to a second embodiment. [Figure 5] FIG. 10 is a system block diagram of a grounding device according to a third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments for carrying out the invention will be described with reference to the drawings.

[0012] (First embodiment) The antenna earth device (hereinafter simply referred to as "antenna earth device") in the medium wave radio broadcasting device according to the first embodiment A schematic system block diagram of the earthing device (hereinafter referred to as the earthing device) according to the first embodiment is shown in FIG. 10 is a signal line (hereinafter referred to as a single line) that connects the output of the medium wave radio broadcasting equipment to the antenna. It is provided in the output section that supplies the antenna wire 16, and is made up of an electric motor. The drive unit 11 and the earth rod 12 that is rotated by the drive unit 11 are provided. The micro switches 13a and 13b are sensors that detect the angles (0 degrees and 90 degrees).

[0013] The driving unit 11 is an electric motor that can rotate the earth rod 12. The driving unit 11 is connected to a control line It is controlled by the control unit 21 connected by 17, and follows the instructions of the control unit 21. The driving unit 11 rotates the earth rod 12. The rotated earth rod 12 moves to the connection point 14b or The connection point 14b is electrically connected to the broadcasting device 2 via a transmission output line 15. 0, and the connection point 14c is connected to the earth via a ground wire 19. In other words, the earth rod 12 rotates between a position where it is connected to the earth and a position where it is disconnected from the earth. This is what is done. When the earth rod 12 is connected to the connection point 14b, the transmission output line 15 of the broadcasting device 20 and the antenna part 30 is connected, and the output signal from the broadcasting device 20 is supplied to the antenna section 30. Furthermore, when the earth rod 12 is connected to the connection point 14c, the antenna part 30 is connected to the earth. It will be connected to.

[0014] The earth rod 12 is a conductor with a connection point 14a as a pivot point. The free end of the earth rod 12 is electrically connected to the antenna wire 16 of the ground rod 12 at the connection point 14b. During normal operation, the free end of the earth rod 12 is connected to the connection point 1 4b, and the output signal from the broadcasting device 20 is transmitted to the antenna unit 30 via the ground rod 12. During maintenance, the earth rod 12 is rotated by the drive unit 11, and the connection point Then, the antenna unit 30 is disconnected from the broadcasting device 20 and connected to the connection point 14b. The power is cut off and connected to the earth via the grounding wire 19. Even if lightning strikes the antenna unit 30, no current flows through the broadcasting device 20. This will prevent electric shock accidents among maintenance workers.

[0015] The earth rod 12 is a conductor having a predetermined length. If the distance between them is too short, a short circuit may occur if an extremely high voltage is generated due to a lightning strike or other cause. In order to prevent short circuits, the distances between the connection points 14a, 14b, and 14c are set to a predetermined value. The predetermined length of the ground rod 12 is such that the spacing is as described above. This is the length required to connect each connection point.

[0016] The micro switches 13a and 13b are sensors that detect the angle of the earth rod 12. The angle of the rod 12 (0 degrees or 90 degrees in this embodiment) is detected and sent to the control unit 21. It is a physical switch that can transmit ON / OFF signals. When the free end of the ground rod 12 is connected to the connection point 14b, the ground rod 12 generates a microwave. The microswitch 13b is provided at a position where the microswitch 13b is pressed. 13b detects the angle (0 degrees) of the earth rod 12. Also, the free end of the earth rod 12 is connected to the 14c, the microswitch 13a is pressed. a is provided, and the microswitch 13a detects the angle (90 degrees) of the earth rod 12.

[0017] As a result, the rotation angle (0 degrees or 90 degrees) of the earth rod 12 is controlled by the microswitch 13. b, 13a, the earth rod 12 is detected as being connected to the broadcasting device 20 (a It is possible to detect whether the power supply is disconnected from the source or connected to earth. In this embodiment, the angle detected by the micro switches 13b and 13a is 0. The angle is 90 degrees, but this angle can be changed as needed.

[0018] The microswitches 13a and 13b are connected to the control unit 21 via a signal line 18. For example, when the angle of the earth rod 12 is 90 degrees, the microswitch 13a is in the ON state. The driving unit 11 is stopped at this point. From there, the earth rod 12 rotates under the conditions described below. When the angle of the earth rod 12 becomes 0 degrees, the microswitch 13b switches on. When the control unit 21 receives the ON signal, the drive unit 11 It will be stopped by 1.

[0019] In this embodiment, the earth rods output from the micro switches 13a and 13b The control unit 21 controls the drive unit 11 based on the angle information of the drive unit 12. By using a motor that rotates a certain angle with one pulse, such as a pinion motor, It is also possible to adopt a configuration in which the microswitches 13a and 13b are omitted. That is, the free end of the earth rod 12 is connected to the connection point 14b. In order to rotate the end of the rod to the position where it is connected to the connection point 14c, the stepping motor is driven by a predetermined number of steps. Since it is already known that the pulses to be applied are This is because it is sufficient to apply a predetermined number of pulses.

[0020] The connection points 14a, 14b, and 14c are connection points of the earth rod 12. The connection point 14a is a The antenna is electrically connected to the pivot point of the ground rod 12 and is provided at the end of the antenna wire 16. The connection point 14b is a connection point where the earth rod 12 and the transmission output line 15 are connected. The connection point 14c is provided at the end of the transmission output line 15. The earth rod 12 and the ground wire 19 are connected at the connection point 14c. The connection points 14a are provided at the ends of the ground wires 19. , 14b, 14c are positioned at a predetermined distance apart to prevent contact during an earthquake or other accident. It will be placed.

[0021] The broadcasting device 20 is a medium wave broadcasting device (approximately 526 to 1606 kHz), and is a so-called transmitting The broadcasting device 20 is generally housed in an electrical panel. In many cases, when performing maintenance on a transmitter, the electrical panel must be opened and the inside of the panel must be operated. During normal operation, the output signal of the broadcasting device 20 is transmitted from the broadcasting device 20 to the connection point 14b, It is connected to the antenna part 30 via the earth rod 12 and the connection point 14a.

[0022] The broadcasting device 20 also includes a control unit 21. The control unit 21 controls the driving unit 11. In this embodiment, the control The control unit 21 is built into the broadcasting device 20, but it may be built into a separate computer or controller. The control unit 21 may be incorporated in the drive unit 11 itself. The control unit 21 is connected to the microswitch 11 via the control line 17. The signal from the switches 13a and 13b is received via a signal line 18, and the drive unit 1 It controls 1.

[0023] Furthermore, the control unit 21 controls the start and end of work by the worker during the maintenance work on the broadcasting device. A work completion signal is detected, and the drive unit 11 is automatically controlled based on the work signal. The signal means, for example, that the final stage output of the broadcasting device 20 is 0, that is, that the final stage voltage is applied. The signal that the MCCB (Molded Case Circuit Breaker) being applied is OFF This signal is detected as a work signal to start work. This work signal is not limited to the above. For example, if a maintenance door for an electrical panel in which the broadcasting device 20 is installed is opened (doorstop), The signal may be generated by a switch being turned ON.

[0024] In addition, a microswitch 13a, 13b is provided near the broadcasting device 20 to control the ON / OFF state of the microswitches 13a, 13b. A display unit is provided to display whether the earth rod 12 is connected to the ground wire 19 or not. The worker may be notified whether or not maintenance is possible by the above.

[0025] Next, the maintenance work will start from the normal operation state and continue until the maintenance work is completed. The operation flow of the earthing device 10 will be described with reference to FIGS.

[0026] In conjunction with the start of maintenance work on the broadcasting device 20, the final stage output of the broadcasting device is set to 0. In this embodiment, the control unit 21 The CCB detects the work signal that has turned OFF (S101).

[0027] Next, the control unit 21 starts the driving unit 11, thereby rotating the earth rod 12 counterclockwise. Rotation starts (S102). According to FIG. 3, this corresponds to the "maintenance start" state. , a voltage is applied to the electric motor that is the drive unit 11.

[0028] The earth rod 12 rotates, turning on the microswitch 13a. When the angle reaches 90 degrees (the state in which the antenna wire 16 and the ground wire 19 are connected) (S103), the control The control unit 21 receives an ON signal that turns on the microswitch 13a, and starts driving the driving unit 11. 3, this corresponds to the "maintenance" state, and the drive unit 1 This is the state where no voltage is applied to the motor at 1.

[0029] Once the maintenance work is completed, the maintenance worker turns on the MCCB. In this embodiment, the control unit 21 detects the operation signal that turns on the MCCB (S105). The maintenance work completion signal is the same as the maintenance work start signal described above. , not limited to MCCB ON.

[0030] Next, the control unit 21 starts the driving unit 11, thereby rotating the earth rod 12 in the clockwise direction. This rotation is the opposite rotation to that in step S102. This corresponds to the "maintenance completed" state, and the motor which is the driving part 11 is in a negative The application of voltage causes the rotor to rotate in the reverse direction from step S102.

[0031] The earth rod 12 rotates, turning on the microswitch 13b. When the angle reaches 0 degrees (the antenna line 16 and the transmission output line 15 are connected) (S107), The control unit 21 receives an ON signal that turns on the microswitch 13b, and starts the driving of the driving unit 11. According to FIG. 3, this corresponds to the "normal operation" state, and the drive unit 11 This is the state where no voltage is applied to the motor.

[0032] This completes the operation flow of the grounding device 10.

[0033] As described above, according to this embodiment, the MCCB is turned off when maintenance work on the broadcasting device is started. At the same time, the earth rod 12 connected to the antenna wire is automatically connected to the ground wire 19. Therefore, maintenance workers will not forget to install the earth rod 12 while working, and lightning strikes will be prevented. This can prevent electric shock accidents.

[0034] (Second embodiment) A schematic system diagram of the earthing device according to the second embodiment is shown in FIG. The earthing device 40 according to this embodiment has a part of its configuration different from that of the first embodiment. The grounding device 40 will be described with reference to FIG. The same components as those in the first embodiment are given the same reference numerals, and the description thereof will be omitted. .

[0035] The grounding device 40 according to the second embodiment has the same structure as the grounding device 10 according to the first embodiment. The transmission output line 15 of the broadcasting device 20 and the antenna line 16 are connected via the earth rod 12. The transmission output line 15 and the antenna line 16 are always connected regardless of the earth rod 12. It is being done.

[0036] In the earthing device 40 according to the second embodiment, the connection point 1, which is the rotation center of the earthing rod 12, 4a is a branch line 4 branched from a branch point 41 which is a connection point between the transmission output line 15 and the antenna line 16. The transmission output line 15 and the antenna line 16 are always connected, The connection point 14b that exists in the earthing device 10 according to the first embodiment is omitted. This connects or disconnects the connection point 14c connected to the ground line 19.

[0037] As in the grounding device 10 according to the first embodiment, the grounding rod 12 is connected to the connection point 14c. When the antenna wire 16 is turned on, the antenna wire 16 is connected to the earth. The force line 15 remains connected, that is, the broadcasting device 20 and the antenna unit 30 remain connected. However, if the branch line 42 is connected to the ground line 19, even if lightning strikes the antenna unit 30, However, the current caused by the lightning strike flows to the ground wire 19 side due to the impedance. This can prevent electric shock accidents among employees.

[0038] The configuration of the earthing device according to the second embodiment allows constant discharge during maintenance and normal operation. Since the transmitter 20 and the antenna unit 30 are connected, even if the grounding device 40 fails, Even if this occurs, normal operation will be possible without any problems.

[0039] (Third embodiment) A schematic system diagram of the earthing device according to the third embodiment is shown in FIG. The earthing device 50 according to this embodiment has a part of its configuration different from that of the first embodiment. The grounding device 50 will be described with reference to FIG. 5. The same components as those in the first embodiment are given the same reference numerals, and the description thereof will be omitted. .

[0040] The grounding device 50 according to the third embodiment has the same structure as the grounding device 10 according to the first embodiment. The micro switches 13a and 13b, which are sensors, are replaced with laser sensors 51a and 51b. The other configurations are the same as those of the grounding device 10 according to the first embodiment.

[0041] The laser sensors 51a and 51b emit laser beams having a certain wavelength (pulse width), for example. The laser is irradiated onto the earth rod 12, and the laser reflected by the earth rod 12 is received. This is a sensor that measures the time and measures the distance to the earth rod 12. The type is not limited to this, and any type that can measure the distance to the earth rod 12 will do. .

[0042] In this embodiment, when the angle of the ground rod 12 is 0 degrees or 90 degrees, The distance between the sensors 51a and 51b and the earth rod 12 is measured in advance, and the earth rod Set the angle of 12 to 0 degrees or 90 degrees.

[0043] When the earth rod 12 rotates from the state where the angle of the earth rod 12 is 90 degrees, the laser sensor 51b When the measured distance to the earth rod 12 reaches a predetermined distance, the angle of the earth rod 12 is 0 degrees. Then, the ON / OFF signal is sent to the control unit, and the control unit 21 stops the drive unit 11.

[0044] In this way, the distance to the earth rod 12 measured by the laser sensors 51a and 51b is The angle of the rod 12 is converted to (0 degrees, 90 degrees) and an ON / OFF signal is sent to the control unit for control. The unit 21 controls the drive unit 11 .

[0045] As described above, according to this embodiment, it is possible to use a mechanical switch as in the first embodiment. This prevents deterioration and malfunction due to repeated use of the switch.

[0046] Although several embodiments of the present invention have been described, these embodiments are presented by way of example only. These novel embodiments are not intended to limit the scope of the invention. The present invention can be embodied in various forms, and various modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are within the scope and spirit of the invention. This invention is intended to cover the scope of the present invention, as well as the scope of the claims and their equivalents. [Explanation of symbols]

[0047] 10...grounding device according to the first embodiment, 11...driving unit, 12...grounding rod, 13a, 13 b...microswitch, 14a, 14b, 14c...connection points, 15...transmission output line, 16...a Antenna wire, 17...control wire, 18...signal wire, 19...ground wire, 20...broadcasting device, 21...control unit , 30...antenna portion, 40...earthing device according to the second embodiment, 41...branch point, 42...min. Branch line, 50...earthing device according to the third embodiment, 51a, 51b...laser sensors

Claims

1. It is provided in an output section that supplies the output of a medium wave radio broadcasting device to an antenna line. So, A grounding wire connected to the earth; It is electrically connected to the antenna wire and can be electrically connected to the ground wire by rotating. A versatile earth rod and The earth rod can be rotated between a position where it is connected to the ground wire and a position where it is disconnected from the ground wire. a drive unit for causing the a sensor for detecting the angle of the earth rod; Detecting an ON / OFF signal from the sensor, and based on the ON / OFF signal, a control unit that automatically controls the drive unit; An antenna earthing device for a medium wave radio broadcasting device.

2. The sensor is a switch pressed by the earth rod.

2. The antenna earth device for a medium wave radio broadcasting apparatus according to claim 1.

3. The sensor is a laser sensor that detects the angle of the earth rod.

2. The antenna earth device for a medium wave radio broadcasting apparatus according to claim 1.

4. During maintenance work on broadcasting equipment, The control unit detects a work signal indicating the start and end of work by the worker, and performs a process based on the work signal. and automatically controlling the driving unit.

2. The antenna earth device for a medium wave radio broadcasting apparatus according to claim 1.

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