JP6607072B2 - Antenna positioner - Google Patents

Description

  The present invention relates to an antenna positioner for an antenna used for measuring unnecessary radiation of electromagnetic waves generated from electronic equipment.

  Conventionally, unnecessary radiation of electromagnetic waves generated from an electronic device has an effect on other electronic devices and causes malfunction. For this reason, electronic devices are obliged to measure unnecessary radiation of electromagnetic waves, and a legal system for these measurements is also in place.

  Usually, measurement of unnecessary radiation of electromagnetic waves generated from an electronic device is performed by measuring an electromagnetic wave radiated from an installed object to be measured in an outdoor facility called an anechoic chamber or an open site. This measurement uses the height of the antenna (the height from the floor of the antenna), the polarization angle of the antenna (the angle that rotates about the front and rear of the antenna), and the orientation of the antenna ( Multiple measurements are performed while changing the angle of rotation about the left and right of the antenna.

  As described above, since changing the measurement conditions is very complicated, there is a demand for an antenna positioner that can automatically set an antenna and that has little influence on the measurement of unwanted radiation.

  However, the mechanism for setting such an antenna itself becomes a source of electromagnetic waves and becomes a factor of deteriorating measurement accuracy.

  As an antenna positioner used for measurement of such unnecessary radiation, for example, a technique as disclosed in Patent Document 1 is known.

JP 2010-117187 A

  According to Patent Document 1, the height of the antenna and the polarization angle of the antenna can be adjusted. However, in order to reduce the electromagnetic wave generated by the power source of the antenna positioner itself, the gap between the bottom surface of the antenna mast facing the floor is set to 2 mm or less. However, this method cannot completely block the influence of electromagnetic waves generated by the power source of the antenna positioner itself. Further, since the gap between the floor and the bottom surface of the antenna mast is set to 2 mm or less, there is a problem that the antenna positioner is easily affected by the unevenness of the floor surface.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an antenna positioner that itself has little influence on measurement of unwanted radiation.

  In order to achieve the above object, the configuration of the present invention includes a first pillar member installed perpendicular to a floor surface, a base portion supporting the first pillar member, and the first pillar member. A lifting body attached to the lifting body, a second pillar member attached to the lifting body, an antenna holder attached to the second pillar member, and attached to the second pillar member, for antenna polarization switching A cylindrical cam that rotates the second column member; a cam pin that rotates the cylindrical cam; an air cylinder that drives the cam pin; a compressor that supplies compressed air to the air cylinder; and a rotating operation of the cylindrical cam. A cylindrical cam fixing mechanism that stops and fixes, and a control unit that controls the compressor and the cylindrical cam fixing mechanism. The control unit operates the compressor only when antenna polarization is switched, and Stopped presser is characterized in that by controlling the cylindrical cam fixing mechanism for fixing to stop the rotation of the cylindrical cam.

  According to the present invention, the controller controls the cylindrical cam fixing mechanism to stop and fix the rotating operation of the cylindrical cam while the compressor is stopped. Thereby, even if the compressor is stopped, the rotation operation of the cylindrical cam can be stopped and fixed, and the rotation angle of the second column member is also fixed. This makes it possible to maintain the polarization angle of the antenna. Therefore, the compressor can be stopped during measurement, and noise generated from the compressor is eliminated. This reduces the influence of the antenna positioner itself on the measurement of unwanted radiation.

The cylindrical cam fixing mechanism includes a plurality of electromagnetic valves that control compressed air supplied to the air cylinder, and the air cylinder is supplied with compressed air from the compressor via the plurality of electromagnetic valves, and the control The unit is characterized in that the rotation of the cylindrical cam is stopped and fixed by controlling the plurality of electromagnetic valves so as to maintain the air pressure in the air cylinder while the compressor is stopped. In this way, it is possible to stop and fix the rotating operation of the cylindrical cam using a plurality of solenoid valves.
Further, the plurality of solenoid valves include a first solenoid valve connected to the compressor and a second solenoid valve connected to the first solenoid valve, wherein the first solenoid valve is a direct acting The second electromagnetic valve is a pilot type, and the control unit first sends compressed air from the first electromagnetic valve to the second electromagnetic valve after the operation of the compressor is started. And then the second solenoid valve is controlled for polarization switching after the air pressure of the compressed air becomes high enough to move the valve of the second solenoid valve. .

  The pilot-type solenoid valve may stop at an intermediate position when compressed air having a pressure lower than a specified value is supplied during the movement of the valve. At the start of operation of the compressor, the pressure of the compressed air output from the compressor is low. For this reason, when the pilot-type second electromagnetic valve is moved, the valve may stop at an intermediate position. In order to avoid stopping at an intermediate position, in the present invention, first, the first electromagnetic valve is controlled, and compressed air is supplied to the second electromagnetic valve. Since the first solenoid valve is a direct acting type, the valve can be moved regardless of the air pressure of the compressed air. After that, after waiting for the air pressure of the compressed air to become sufficiently high, the valve can be moved without stopping at the intermediate position by controlling the second electromagnetic valve. This makes it possible to use a pilot type for the second solenoid valve, thereby reducing the power consumption and volume of the air circuit. Further, since the compressed air having a high pressure is always supplied during the movement of the valve of the second electromagnetic valve, a buffer tank for stabilizing the pressure is not necessary, and the volume of the air circuit can be further reduced. By reducing the volume, the influence of the volume itself on the electromagnetic wave measurement can be reduced.

  When the valve of the second solenoid valve stops at an intermediate position, the control unit performs control for separating the second solenoid valve from the first solenoid valve with respect to the first solenoid valve, and The first solenoid valve is controlled to send compressed air to the second solenoid valve again after waiting for the pressure in the first solenoid valve to increase sufficiently to drive the second solenoid valve. On the other hand, by performing at least once, the valve of the second electromagnetic valve is moved to a normal position.

  By making the first solenoid valve direct-acting, even if the second solenoid valve stops at an intermediate position and the pressure of compressed air decreases, the valve of the first solenoid valve moves, and the first solenoid valve moves. The second solenoid valve can be separated from the solenoid valve. This makes it possible to increase the pressure in the first electromagnetic valve, and after the pressure has increased, move the valve of the first electromagnetic valve and connect the second electromagnetic valve. High pressure compressed air can be supplied to the second solenoid valve. Thereby, the valve of the second electromagnetic valve can be moved to a normal position. Further, even when the normal state cannot be restored by one operation, the normal state can be restored by repeating the operation a plurality of times.

  The plurality of solenoid valves include a third solenoid valve connected between the compressor and the first solenoid valve, the third solenoid valve is a direct acting type, and the control unit Controlling the third solenoid valve, exhausting the air in the compressor when the compressor is stopped, and sending the compressed air from the compressor to the first solenoid valve when the compressor is operating. The electromagnetic valve is controlled.

  This makes it possible to prevent deterioration of the compressor. The control unit controls the air in the compressor to be exhausted through the third solenoid valve while the compressor is stopped, so that the pressure in the compressor becomes the same as the atmospheric pressure, and the compressor Such stress can be reduced. This can prevent deterioration of the compressor. By making the third solenoid valve a direct acting type, it becomes possible to move the valve of the third solenoid valve without compressed air from the compressor, and when the compressor is stopped, It is possible to return from the state where the air is exhausted.

  The control unit, the plurality of solenoid valves, and the compressor are installed inside the base unit, and the base unit is covered with ferrite.

  This improves the measurement accuracy. Since metal is used for the components of the compressor and the solenoid valve, the electromagnetic wave is reflected, which causes the measurement accuracy to deteriorate. Further, the control unit also becomes a source of electromagnetic waves and becomes a factor of deteriorating measurement accuracy. By installing the plurality of solenoid valves, the compressor, and the control unit provided in the air circuit in the base unit, it is possible to increase the distance from the compressor and the antenna, thereby reducing the influence on the measurement. Moreover, by covering the casing of the base portion with ferrite, reflection of electromagnetic waves can be suppressed and the influence on measurement can be reduced.

  According to the configuration of the present invention, it is possible to provide an antenna positioner having less influence on the measurement of unwanted radiation.

It is a perspective view which shows the antenna positioner by Embodiment 1. FIG. It is a side view of the 1st pillar material by Embodiment 1. It is a perspective view of the mechanism which rotates the 2nd pillar material by Embodiment 1, and the 2nd pillar material. 2 is a configuration explanatory diagram of a mechanism for performing polarization switching according to Embodiment 1. FIG. FIG. 5 is an operation timing chart of the compressor according to the first embodiment. It is an air circuit diagram which drives the 1st air cylinder by Embodiment 1. FIG. 6 is an operation explanatory diagram of the air circuit during horizontal holding according to the first embodiment. FIG. 5 is an operation explanatory diagram of the air circuit during vertical switching according to the first embodiment. FIG. 6 is an operation explanatory diagram of an air circuit during vertical switching according to the first embodiment. FIG. 6 is an operation explanatory diagram of the air circuit during vertical holding according to the first embodiment. FIG. 6 is an operation explanatory diagram of the air circuit during horizontal switching according to the first embodiment. FIG. 6 is an operation explanatory diagram of the air circuit during horizontal switching according to the first embodiment. It is a state explanatory view of the air circuit at the time of trouble occurrence by Embodiment 1. FIG. 6 is an operation explanatory diagram of the air circuit when returning from a problem according to the first embodiment. It is an air circuit diagram which drives the 1st air cylinder by Embodiment 2. FIG. 10 is an operation explanatory diagram of an air circuit during vertical switching according to the second embodiment. FIG. 10 is an operation explanatory diagram of the air circuit during horizontal holding according to the second embodiment. FIG. 10 is an operation explanatory diagram of a rotating cam fixing mechanism at the time of switching according to Embodiment 3. FIG. 10 is an operation explanatory diagram of the rotating cam fixing mechanism at the time of fixing according to the third embodiment. It is a measurement waveform of unnecessary radiation when the compressor is operated alone. It is a measurement waveform of unnecessary radiation when the compressor is stopped alone.

  Hereinafter, embodiments of the invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing an antenna positioner according to the first embodiment.

  The first column member 1 is a long rectangular parallelepiped member that stands on the base portion 3. The first pillar 1 and the base 3 are preferably formed of a non-metallic material such as fiber reinforced plastic so as to suppress reflection of electromagnetic waves.

  FIG. 2 is a side view of the first pillar member according to the first embodiment.

  The elevating body 4 is attached to the column member 1 so as to be movable up and down. The belt 5 is fixed to the elevating body 4 by a first belt holder 15a and a second belt holder 15b. The belt 5 is driven by a servo motor provided inside the base portion 3. The belt 5 circulates along the pillar material 1 via a pulley 6 attached to the upper part of the pillar material 1.

  The support body 7 is attached to the side surface of the elevating body 4 so as to be able to rotate in the vertical direction. (Figure 1)

  FIG. 3 is a perspective view of the second pillar 2 and the mechanism for rotating the second pillar 2 according to the first embodiment.

  The support 7 includes a cylindrical cam 9. The cylindrical cam 9 is attached so that the second pillar 2 passes through the rotation axis of the cylindrical cam 9. The cylindrical cam 9 and the second pillar member 2 are solidified. Therefore, when the cylindrical cam 9 rotates, the second pillar member 2 also rotates simultaneously. The support body 7 is configured to hold the cylindrical cam 9 and the second pillar member 2 rotatably.

  The first air cylinder 8 is installed in a direction along the second column member 2. The first air cylinder 8 includes a cam pin 10 that engages with a cam groove 11 provided in the cylindrical cam 9. The cam pin 10 is driven by the first air cylinder 8 and is caused to linearly move along the second pillar member 2. As the cam pin 10 moves along the cam groove 11, the cylindrical cam 9 rotates. The first air cylinder 8 is driven by the air sent through the tube 12 from the compressor provided inside the base portion 3.

  The first air cylinder 8 can be composed of only non-metallic parts. However, a compressor is required to drive the first air cylinder 8. In addition, a solenoid valve is required to control the compressed air output from the compressor. Since these compressors and solenoid valves must use metal parts, they reflect electromagnetic waves and deteriorate measurement accuracy. However, since the first air cylinder 8 can be driven by air, a place where the compressor and the solenoid valve are separated from the first air cylinder 8 like the inside of the base portion 3 if a tube for sending air is used. Can be installed. As a result, the distance from the antenna to the compressor and the solenoid valve is increased, and the influence of reflection is reduced, so that the influence on the measurement is also reduced. Further, by covering the base portion 3 with ferrite, reflection from the base portion 3, the compressor and the electromagnetic valve is further suppressed, and the measurement accuracy is improved.

  The second column member 2 includes an antenna holder 13 at the tip. The antenna holder 13 is fixed to the second pillar member 2, and the antenna holder 13 is also rotated simultaneously with the rotation of the second pillar member 2. The antenna holder 13 has a structure that can hold the arm of the antenna 14. Therefore, the linear movement of the cam pin 10 driven by the first air cylinder 8 also rotates the antenna holder 13 and the antenna 14 held by the antenna holder 13, thereby enabling polarization switching.

  The second column member 2, the antenna holder 13, and the mechanism for rotating the second column member 2, that is, the elevating body 4, the cylindrical cam 9, the cam pin 10, the first air cylinder 8, and the tube 12 reflect electromagnetic waves. It is desirable to be formed of a non-metallic material, for example, a resin so as to suppress it.

  FIG. 4 is an explanatory diagram of a mechanism for switching polarization.

  The compressed air output from the compressor 16 drives the first air cylinder 8 via the plurality of electromagnetic valves 31. The movement of the first air cylinder 8 is transmitted to the cam pin 10 to rotate the cylindrical cam 9 and the second column member 2. Therefore, the antenna 14 held by the antenna holder 13 provided in the second pillar member 2 also rotates and the polarization can be switched. The control unit 30 controls the switching of the polarization by controlling the compressor 16 and the electromagnetic valve 31 as the cylindrical cam fixing mechanism by an electric signal. The compressor 16, the plurality of solenoid valves 31, and the first air cylinder 8 calibrate an air circuit for driving the cam pin 10. In addition, the control unit 30 is also installed inside the base unit 3 in order to avoid deterioration of measurement accuracy by itself.

  FIG. 5 is a diagram illustrating the operation timing of the compressor according to the first embodiment.

  During the measurement, the compressor operation is stopped (Period 1). Next, the compressor is operated to switch the polarization (period 2). No measurements are made during this period. When the switching of polarization is completed, the compressor is stopped and measurement is performed (period 3). Next, the compressor is operated to switch the polarization (period 4). Thus, by controlling the operation of the compressor, it is possible to completely eliminate noise generated from the compressor during measurement, and the measurement accuracy is improved. Usually, measurement is performed with the polarization fixed vertically or horizontally. Therefore, even if this control is performed, the measurement accuracy can be improved without affecting the measurement time.

  FIG. 6 is an air circuit diagram for driving the first air cylinder 8 according to the first embodiment.

  The compressor 16 is connected to the first electromagnetic valve 17. The first electromagnetic valve 17 is connected to the second electromagnetic valve 18. The second solenoid valve 18 is connected to the first air cylinder 8. The first solenoid valve 17 is a direct acting three-way solenoid valve, and the second solenoid valve 18 is a pilot-type four-way solenoid valve.

  The control unit 30 switches between energization and non-energization for the first solenoid 22, the second solenoid 23, and the third solenoid 24. As a result, the polarization is switched by operating the piston 21 (connected to the cam pin 10) of the first air cylinder 8.

  Whether the first port 8a or the second port 8b is supplied with air is vertically or horizontally changed depending on the connection method of the mechanism that performs polarization connected to the first air cylinder 8. . Hereinafter, for the sake of explanation, when the first port 8a is exhausted and the second port 8b is supplied with air, it is switched horizontally, and when the first port 8a is supplied with air and the second port 8b is exhausted, it is switched vertically. The operation will be described on the assumption.

  FIG. 7 is an operation explanatory diagram of the air circuit when the horizontally polarized wave according to the first embodiment is held.

  When the first solenoid 22 and the second solenoid 23 are de-energized and the third solenoid 24 is energized, the positions of the first valve 17a, the second valve 18a, the third valve 18b, and the fourth valve 18c Moves to the position shown in FIG. As a result, the circuit connected to the second port 8b becomes a closed circuit. Therefore, even if the compressor 16 is stopped, the pressure in the circuit is maintained, the positions of the first piston rod 20 and the piston 21 can be fixed, and horizontal polarization can be maintained. Thereby, in order to eliminate the noise generated from the compressor 16 during the measurement, the compressor 16 can be stopped to improve the measurement accuracy.

  8 and 9 are operation explanatory diagrams of the air circuit when switching from horizontal polarization to vertical polarization according to the first embodiment.

  When the compressor 16 is operated and the first solenoid 22 is energized to switch the polarization from horizontal to vertical, the position of the first valve 17a moves to the position shown in FIG. After operating the compressor 16, when the air pressure of the compressed air increases so that the second solenoid valve can be moved without any problem, the second solenoid 23 is energized and the third solenoid 24 is switched to non-energization. The second valve 18a, the third valve 18b, and the fourth valve 18c move to the positions shown in FIG. As a result, air is supplied from the first port 8a and exhausted from the second port 8b, and the positions of the first piston rod 20 and the piston 21 are moved to switch from horizontal polarization to vertical polarization. .

  By the way, there are two types of solenoid valves, a direct acting type and a pilot type. The pilot type has the advantage that it consumes less power and is smaller than the direct acting type. However, since the pressure of compressed air is used to move the valve, the pressure of the compressed air that is sent is not high enough. May cause the valve movement to stop halfway. In the first embodiment, the first solenoid valve 17 is a direct acting solenoid valve, and the second solenoid valve 18 is a pilot solenoid valve. After starting the compressor 16, first, the first valve 17a is moved. Thereafter, after the compressed air from the compressor 16 and the pressure in the first electromagnetic valve 17 are increased, the second valve 18a, the third valve 18b, and the fourth valve 18c are moved. When the valves are moved in this order, low pressure compressed air is not supplied to the second solenoid valve 18, and no malfunction occurs even if a pilot type is used for the second solenoid valve 18. . Furthermore, the second solenoid valve 18 having the largest number of ports and having a complicated shape and is always energized can be made a pilot type, and the power consumption and volume of the entire air circuit can be reduced. .

  In order to prevent pressure drop, an air tank is often used. However, in this embodiment, the air tank is not necessary and the volume of the air circuit can be further reduced.

FIG. 10 is an operation explanatory diagram of the air circuit when the vertically polarized wave according to the first embodiment is held.

  When the first solenoid 22 and the third solenoid 24 are de-energized and the second solenoid 23 is energized, the positions of the first valve 17a, the second valve 18a, the third valve 18b, and the fourth valve 18c Moves to the position shown in FIG. Thereby, the air circuit 28 connected to the first port 8a becomes a closed circuit. Therefore, even if the compressor 16 stops, the pressure in the air circuit 28 is maintained, the positions of the first piston rod 20 and the piston 21 can be fixed, and the vertically polarized wave can be maintained. Thereby, in order to eliminate the noise generated from the compressor 16 during the measurement, the compressor 16 can be stopped to improve the measurement accuracy.

  11 and 12 are operation explanatory diagrams of the air circuit when switching from vertical polarization to horizontal polarization according to the first embodiment.

  In order to switch the polarization from vertical to horizontal, when the compressor 16 is operated and the first solenoid 22 is energized, the first valve 17a, the second valve 18a, the third valve 18b, and the fourth valve 18c. Is moved to the position shown in FIG. After operating the compressor 16, when the air pressure of the compressed air has increased to such an extent that the second solenoid valve can be moved without any problem, the third solenoid 24 is energized and the second solenoid 23 is switched to non-energization. The first valve 17a, the second valve 18a, the third valve 18b, and the fourth valve 18c move to the positions shown in FIG. As a result, the exhaust gas is supplied from the first port 8a and the air is supplied to the second port 8b, and the position of the first piston rod 20 is moved to switch from vertical polarization to horizontal polarization.

  In the first embodiment, the first solenoid valve 17 is a direct acting solenoid valve, and the second solenoid valve 18 is a pilot solenoid valve. After starting the compressor 16, first, the first valve 17a is moved. After the compressed air from the compressor 16 and the pressure in the first electromagnetic valve 17 increase, the second valve 18a, the third valve 18b, and the fourth valve 18c are moved. When the valves are moved in this order, low pressure compressed air is not supplied to the second solenoid valve 18, and no malfunction occurs even if a pilot type is used for the second solenoid valve 18. . Furthermore, the power consumption and volume of the entire air circuit can be reduced by making the second solenoid valve 18 having the largest number of ports and having a complicated shape and being always energized into a pilot type.

  FIG. 13 is an explanatory diagram of an air circuit when a problem occurs according to the first embodiment. FIG. 14 is an operation explanatory diagram of the air circuit at the time of recovery from the problem according to the first embodiment.

  If the valve of the second solenoid valve 18 stops at an intermediate position due to a failure such as a power failure and the air leaks from the air circuit, the pilot-type second solenoid valve 18 is normal due to insufficient compressed air pressure. It becomes impossible to return to the correct state (FIG. 13). However, by making the first solenoid valve 17 a direct acting type, the first solenoid valve 17 can be disconnected from the second solenoid valve 18 by moving the first valve 17 a even in the absence of compressed air pressure. Is possible (FIG. 14). After the pressure of the compressed air output from the compressor 16 is restored (that is, after the pressure is increased enough to drive the second electromagnetic valve), the compressed air is again supplied to the second electromagnetic valve 18. The second solenoid valve 18a, the third valve 18b, and the fourth valve 18c are moved to the normal positions by performing the sending control at least once with respect to the first solenoid valve, and the second solenoid valve is moved to the normal position. 18 can be returned to a normal state.

  FIG. 15 is an air circuit diagram for driving the first air cylinder 8 according to the second embodiment.

  The compressor 16 is connected to the third electromagnetic valve 19. The third electromagnetic valve 19 is connected to the first electromagnetic valve 17. The first electromagnetic valve 17 is connected to the second electromagnetic valve 18. The second solenoid valve 18 is connected to the first air cylinder 8. The first solenoid valve 17 and the third solenoid valve 19 are direct-acting three-way solenoid valves, and the second solenoid valve 18 is a pilot-type four-way solenoid valve.

  FIG. 16 is an operation explanatory diagram of the air circuit when switching from horizontal polarization to vertical polarization according to the second embodiment. FIG. 17 is an operation explanatory diagram of the air circuit when the horizontally polarized wave according to the second embodiment is held.

  During the polarization switching, the fourth solenoid 25 is energized to move the fifth valve 19a to the position shown in FIG. 16, and the compressed air from the compressor 16 is transmitted to the first electromagnetic valve 17 so that the polarization is changed. Enable switching. During measurement (that is, when the compressor 16 is stopped as described above), when the fourth solenoid 25 is de-energized, the fifth valve 19a moves to the position shown in FIG. Exhaust. As a result, the residual pressure in the stopped compressor 16 can be released, and the compressor 16 can be prevented from deteriorating. Since the third solenoid valve 19 is a direct acting type, it is possible to move the valve of the third solenoid valve 19 even when there is no compressed air from the compressor 16, and the air in the compressor 16 is exhausted. It is possible to return from the state. That is, during the operation of the compressor 16, the third solenoid valve 19 is controlled so as to send the compressed air from the compressor 16 to the first solenoid valve 17, thereby returning from the state in which the air in the compressor 16 is exhausted. it can.

  The operations and actions of the first solenoid valve 17 and the second solenoid valve 18 according to the second embodiment are the same as those of the first embodiment.

  In the first and second embodiments, the air circuit includes only the first solenoid valve 17, the second solenoid valve 18, the third solenoid valve 19, the compressor 16, and the first air cylinder 8. For adjusting the speed of wave switching, a speed adjusting valve, a check valve for preventing air from flowing in the reverse direction, a regulator for keeping the pressure constant, and the like may be separately provided.

In the first and second embodiments, a cylindrical cam fixing mechanism is constructed by providing a plurality of solenoid valves, and the plurality of solenoid valves are controlled to stop and fix the rotation of the cylindrical cam while the compressor is stopped. However, other configurations may be used as the cylindrical cam fixing mechanism.
FIG. 18 is an operation explanatory view of the cylindrical cam fixing mechanism at the time of switching according to the third embodiment. FIG. 19 is an operation explanatory diagram of the cylindrical cam fixing mechanism at the time of fixing according to the third embodiment.

  The second air cylinder 32 includes a second piston rod 34, a third port 32c, and a fourth port 32d. The air circuit 33 is connected to the fourth port 32d. The third port 32c is open. The plate member 35 is operably connected to the second piston rod 34 and the rod 36, respectively. The rod 36 includes a first holder 37, a second holder 38 and a spring 39. The cylindrical cam 9 includes a recess 40. The first holder 37, the second holder 38, and the rod 36 are arranged so that the rod 36 can be fitted into the recess 40. One end of the spring 39 that is not connected to the rod 36 is fixed at a location where the distance does not change relative to the cylindrical cam 9 such as the second pillar 2 and the support 7.

  When compressed air is supplied to the fourth port 32d by the air circuit 33, the second piston rod 34 moves to the left. Since the plate material 35 is fixed at the fulcrum 41, when the second piston rod 34 moves to the left, the pin 36 moves to the right and the tip of the pin 36 comes off the recess 40. As a result, the cylindrical cam 9 can be freely rotated and the polarization can be switched. The air circuit 33 includes a compressor, and compressed air is supplied from the compressor. In this case, the compressor of the air circuit 33 is shared with the compressor that drives the first air cylinder in the first embodiment.

  When the fourth port 32 d is opened by the air circuit 33, the rod 36 is fitted into the recess 40 by the force of the spring 39. As a result, the rotating cam 9 is fixed and the polarization is fixed in a horizontal or vertical state. Since a force is applied from the spring 39 to the rod 36, the rod 36 can be maintained in a state where the rod 36 is fitted into the recess 40 without supplying compressed air to the fourth port 32d. That is, even if the compressor described above is stopped and the supply of compressed air is stopped, the rotational operation of the cylindrical cam 9 can be stopped and fixed.

  In the present embodiment, the method of fixing the rod 36 with a spring has been described. However, if the rod 36 can be fixed, a method of fixing by a mechanism other than the spring may be used.

  FIG. 20 shows a measurement waveform of unnecessary radiation when the compressor is operated alone. FIG. 21 is a measurement waveform of unnecessary radiation when the compressor is stopped. The noise level is lower when the compressor is stopped than during operation. It is clear that stopping the compressor during measurement improves the measurement accuracy.

DESCRIPTION OF SYMBOLS 1 1st pillar material 2 2nd pillar material 3 Base part 4 Lifting body 5 Belt 6 Pulley 7 Support body 1 1st air cylinder 8a 1st port 8b 2nd port 9 Cylindrical cam 10 Cam pin 11 Cam groove 12 Tube 13 Antenna holder 14 Antenna 15a 1st belt holder 15b 2nd belt holder 16 Compressor 17 1st solenoid valve 17a 1st valve 18 2nd solenoid valve 18a 2nd valve 18b 3rd valve 18c 4th Valve 19 third solenoid valve 19a fifth valve 20 first piston rod 21 piston 22 first solenoid 23 second solenoid 24 third solenoid 25 fourth solenoid 28 air circuit 30 control unit 31 plural Solenoid valve 32 Second air cylinder 32c Third port 32d Fourth port 33 Air circuit 34 Second piston rod 35 Plate material 36 37 First holder 38 Second holder 39 Spring 40 Depression 41 Support point

Claims (5)

A first pillar material installed perpendicular to the floor surface;
A base portion supporting the first pillar material;
A lifting body attached to the first pillar material;
A second pillar attached to the lifting body;
An antenna holder attached to the second pillar member;
A cylindrical cam attached to the second column member and rotating the second column member for antenna polarization switching;
A cam pin that rotates the cylindrical cam;
An air cylinder for driving the cam pin;
A compressor for supplying compressed air to the air cylinder;
A cylindrical cam fixing mechanism for stopping and fixing the rotation of the cylindrical cam;
A control unit for controlling the compressor and the cylindrical cam fixing mechanism;
The controller is
Operate the compressor only when switching the antenna polarization, and while the compressor is stopped, control the cylindrical cam fixing mechanism to stop and fix the rotating operation of the cylindrical cam ,
The cylindrical cam fixing mechanism is
A plurality of solenoid valves for controlling the compressed air supplied to the air cylinder;
The air cylinder is
Compressed air is supplied from the compressor via the plurality of solenoid valves,
The controller is
While the compressor is stopped, the plurality of electric powers are maintained so as to maintain air pressure in the air cylinder.
An antenna positioner characterized in that the rotation of the cylindrical cam is stopped and fixed by controlling a magnetic valve . The plurality of solenoid valves are:
A first solenoid valve connected to the compressor;
A second solenoid valve connected to the first solenoid valve;
The first solenoid valve is a direct acting type,
The second solenoid valve is a pilot type,
The controller is
After starting the operation of the compressor, first, the first solenoid valve is controlled so that compressed air is sent to the second solenoid valve,
After then becomes high as the air pressure of the compressed air to move the valve of the second electromagnetic valve, according to claim 1, wherein the controller controls the second solenoid valve for polarization switching Antenna positioner. When the valve of the second solenoid valve stops at an intermediate position,
The controller is
Performing control for separating the second solenoid valve from the first solenoid valve to the first solenoid valve;
Waiting for the pressure in the first solenoid valve to increase sufficiently to drive the second solenoid valve, and then controlling the first solenoid valve to send compressed air to the second solenoid valve again. at least once by performing above, the antenna positioner according to claim 2, characterized in that to move the valve of the second solenoid valve to the normal position with respect to. The plurality of solenoid valves are:
A third solenoid valve connected between the compressor and the first solenoid valve;
The third solenoid valve is a direct acting type,
The controller is
The third solenoid valve is controlled, the air in the compressor is exhausted when the compressor is stopped, and the compressed air from the compressor is sent to the first solenoid valve when the compressor is operating. The antenna positioner according to claim 2 or 3 , wherein the electromagnetic valve is controlled. The control unit, the plurality of solenoid valves and the compressor are installed inside the base unit,
The antenna positioner according to any one of claims 1 to 4 , wherein the base portion is covered with ferrite.

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