JP4725378B2 - Parabolic antenna assembly method, assembly jig, and radome mounting bracket - Google Patents

Description

  The present invention relates to a method for assembling a high-performance parabolic antenna, an assembly jig, and a radome mounting bracket.

In recent years, a new standard for performing large-capacity communication has been set in the radiation directivity characteristics standard of communication lines using terrestrial microwaves, and is already in operation.
This standard strictly limits the amount of cross-polarization (XPD: cross-polarization discrimination) that leaks from differently polarized waves (from vertical polarized waves if the main polarized waves are horizontal polarized waves) to radio waves radiated as the main polarized waves. Has been.

  Conventionally, Patent Documents 1 and 2 describe a mechanism for finely adjusting the direction and position of an antenna by adjusting the positional relationship between the antenna and a frame (support frame) that supports the antenna after assembly and installation. In addition, the antenna described in Patent Document 3 is known as an antenna that enables position adjustment of the polarization angle of the antenna power feeding unit. In addition to the direction adjustment and position adjustment after assembling and installing the antenna as described above, it is necessary to improve the accuracy of assembling the antenna itself as a prerequisite.

  The main components of a parabolic antenna include a circular aperture reflector that increases the directivity of radio waves and ensures gain, and a primary radiator that inputs and outputs radio waves to and from the reflector. In order to ensure electrical characteristics (XPD characteristics) with respect to the directional characteristics standard, it is necessary to ensure both the characteristics of the primary radiator and the mirror surface accuracy of the reflecting mirror.

The XPD characteristic is first governed by the XPD characteristic of the primary radiator itself, but the primary radiator is generally manufactured as a single structure, so that sufficient accuracy is ensured during production. Is relatively easy.
Japanese Utility Model Publication No. 61-188007 Japanese Utility Model Publication No. 61-191611 JP 09-284018 A

However, there has been the following problem for ensuring the mirror surface accuracy of the reflecting mirror.
A high-performance parabolic antenna is a structure with a diameter of several meters or more (3 m is the mainstream in Japan), and is often assembled at the time of installation due to restrictions on transportation, etc., so that it is distorted while maintaining the desired mirror surface accuracy in field work. In spite of having to be assembled without problems, the material characteristics of the component parts that the RRP radome and the aluminum reflector are different in rigidity, and the mirror accuracy of the reflector are measured in the field It was difficult to assemble everything accurately and identically because of the problem of securing the work place and the place to perform assembly work.

Specifically, at present, when assembling a radome and a reflecting mirror, a plurality of L-shaped radome mounting brackets are attached to the periphery of the opening of the reflecting mirror, and the radome flange mounted on the reflecting mirror and the radome mounting bracket are mounted. It is fixed by bolting.
However, in the radome that is used as standard, the rigidity of the flange part to which the radome mounting bracket is attached is higher than the rigidity of the reflector, so if dozens of bolts are tightened randomly, Degradation of mirror surface accuracy.
In addition, even if it is tightened sequentially in the circumferential direction, unnecessary tension is applied to the reflector due to the flange surface distortion that cannot be avoided in the production of the radome, and the phenomenon that the XPD characteristics necessary for operation cannot be secured occurs. .

  In addition, in the case where the reflector is assembled by joining the reflectors that are divided into four sectors in consideration of its transportability, the strength of the joint portion between the sector portions is different from the surrounding portions. In addition, depending on the installation environment, it may be necessary to transport the radome as four sectors as in the case of the reflector. In this case, the rib portion at the joint portion between the sector portions has high rigidity in the assembly. The rigidity of the flange on the outer periphery of the radome varies depending on its position, and if the bolts are not tightened carefully, further distortion of the reflecting mirror will occur.

  As described above, a difference in rigidity between the reflecting mirror and the radome, a difference in partial rigidity between the reflecting mirror or the radome having a divided structure, or a bolt fastening order may cause a large distortion in the reflecting mirror. It was.

  On the other hand, when trying to make a structure that does not generate the strain as described above in units of parts, it is necessary to consider a strong material and configuration. In that case, there is an increase in production cost, and there is a disadvantage that the advantages of production efficiency and price reduction are lost because it has to be distinguished from a standard performance antenna.

  Therefore, the present invention avoids deterioration of the mirror surface accuracy of the reflecting mirror, ensures electrical characteristics, and can be easily assembled without extra cost, assembling method of parabolic antenna, assembly jig, and radome mounting Provide brackets.

The present invention is claimed in claim 1, the radome to a plurality of radome mounting bracket that is fixed at a plurality of positions of the opening peripheral edge of the reflector by bolting, the assembling method of the parabolic antenna of assembling these reflecting mirrors and the radome, the radome The vertical position of the radome mounting bracket is determined by moving the radome mounting bracket in the vertical direction with respect to the bolt inserted through the vertically long bolt hole of the mounting bracket, and the radome mounting bracket is attached to the reflecting mirror by the bolt. After fixing, the position of the flange 3 ′ of the radome 3 with respect to the plurality of radome mounting brackets 4... (9...) Is confirmed by the scale 5e (9e) displayed on the position confirmation means and positioned. Paraboloid for fixing the flange 3 ′ of the radome 3 to the radome mounting bracket 4... (9. It is an assembly method of the container.

  The present invention according to claim 2 uses a planar U-shaped assembly jig 5 displaying a scale 5e as a position confirmation means separately from the radome mounting bracket 4..., Which is used as the radome mounting bracket 4. .., And the position of the flange 3 ′ of the radome 3 with respect to the radome mounting bracket 4... Is confirmed by the scale 5 e.

  According to the third aspect of the present invention, the assembling jig 5 has a U-shape in which a pair of arm portions 5b and 5b are extended from both ends of the base portion 5a, and a scale is provided on at least one of the arm portions 5b and 5b. The parabola antenna assembling method according to claim 2, wherein 5e is displayed, and the arm portion 5b, 5b serves as a fitting portion 5c to be fitted to the radome mounting bracket 4.

  According to the present invention of claim 4, the position confirmation means is the radome mounting bracket 9 itself having a scale 9e on the upper surface, and the position of the flange 3 'of the radome 3 relative to the radome mounting bracket 4 ... by the scale 9e. The method for assembling the parabolic antenna according to claim 1, wherein:

The present invention according to claim 5 is a jig for assembling a parabolic antenna used for confirming the positional relationship between the reflecting mirror 2 and the radome 3 when the reflecting mirror 2 and the radome 3 are assembled, and a pair of arms 5b and 5b are connected to the base 5a. The position of the radome mounting bracket 4 ... that is positioned in the vertical direction by being moved in the vertical direction and fixed to the reflecting mirror 2 and the flange 3 ′ of the radome 3 is formed in a planar U shape extending from both ends. A scale 5e for confirmation is displayed on at least one of the arms 5b, 5b, and the parabola antenna is assembled with a fitting portion 5c fitted between the arms 5b, 5b to the radome mounting bracket 4 ... For jigs.

According to the sixth aspect of the present invention, the radome mounting plate 9b provided with the bolt hole 9b 'is continuously connected to the one side edge of the reflector mounting plate 9a provided with the bolt hole 9a'. In the side L-shaped radome mounting bracket for fixing the radome 3 to the reflecting mirror 2, the bolt hole 9a 'of the reflecting mirror mounting plate 9a is opened in a vertically long direction, and the radome mounting plate 9b The radome mounting bracket of the parabolic antenna displays a scale 9e for confirming the position of the flange 3 'of the radome 3.

  According to the present invention, since the positional relationship between the reflecting mirror and the radome can be easily confirmed, it is possible to suppress the occurrence of distortion of the reflecting mirror during assembling and prevent deterioration of the electrical characteristics.

  In the method of assembling a parabolic antenna in which a radome is bolted to a plurality of radome mounting brackets fixed at a plurality of locations on the periphery of the opening of the reflector, the plurality of radome mounting brackets 4. 9), the position of the flange 3 'of the radome 3 is confirmed by the scale 5e (9e) displayed on the position confirmation means, and then the flange 3' of the radome 3 is attached to the radome mounting bracket 4 ... ( 9 ...) How to assemble a parabolic antenna that is fastened with bolts.

  A jig for assembling a parabolic antenna used to confirm the positional relationship between the reflecting mirror 2 and the radome 3 and having a pair of arms 5b and 5b extending from both ends of the base 5a. And a scale 5e for confirming the positional relationship between the radome mounting bracket 4 fixed to the reflecting mirror 2 and the flange 3 'of the radome 3 is displayed on at least one of the arm portions 5b and 5b. A parabolic antenna assembly jig having a fitting portion 5c that fits between the arm portions 5b and 5b to the radome mounting bracket 4.

  The radome 3 is connected to the reflecting mirror 2 continuously provided in a state in which the radome mounting plate 9b having the bolt hole 9b 'is bent at a right angle at one side edge of the reflector mounting plate 9a having the bolt hole 9a'. A radome mounting bracket for a parabolic antenna, in which a scale 9e for confirming the position of the flange 3 'of the radome 3 is displayed on the radome mounting plate 9b in the L-shaped side radome mounting bracket for fixing.

  First, Example 1 of the present invention will be described.

  As shown in FIG. 1, a parabolic antenna 1 according to the present embodiment has a bowl shape having a circular upper surface opening, an aluminum reflecting mirror 2 having a vertical wall 2 'suspended from the periphery of the upper surface opening, and a circular lower surface opening. It is composed of an FRP (conical) radome 3 having a flange shape having a peripheral edge and having a flange 3 'extending horizontally outward at the peripheral edge of the opening.

The parabolic antenna 1, the above-mentioned radome 3, and Nono to the reflecting mirror 2, in terms of distortion of the reflecting mirror could impact XPD characteristic is adjusted within a predetermined range mutual positional relationship so as not to occur, Dozens of radome mounting brackets 4... Attached to the periphery of the opening of the reflecting mirror 2 and the flange 3 ′ of the radome 3 are fixed with bolts and nuts.

The radome mounting bracket 4 is an L-shaped side surface that is connected to one side edge (upper edge) of the reflector mounting plate 4a in a state where the radome mounting plate 4b is bent at a right angle.
As shown in FIG. 2, the reflector mounting plate 4a has two vertically long bolt holes 4a 'and 4a', and the radome mounting plate 4b has one vertically long bolt hole 4b '. ing.
These radome mounting brackets 4... Are fixedly attached to the outer peripheral surface of the reflecting mirror 2, that is, the vertical wall 2 ′ suspended from the peripheral edge of the opening by the reflecting mirror mounting plate 4 a.

The assembling jig (position confirmation means) 5 according to the present invention extends the arms 5b and 5b which are also narrow at right angles to both ends of the narrow base 5a slightly longer than the width of the radome mounting bracket 4. The arm 5b is a thin plate-like plate having a U-shape that is a fitting portion 5c that fits the radome mounting bracket 4 ... between the arms 5b, 5b. The ends of the arms 5b, 5b are folded downward. The curved vertical wall contact pieces 5d and 5d are formed.
The width of the fitting portion 5c is the same as the width of the radome mounting bracket 4 ..., and the radome mounting bracket 4 ... and the radome 3 are positioned at required positions on the upper surfaces of the arm portions 5b, 5b. Scales 5e and 5e for confirming the positional relationship with the flange 3 'are displayed by printing, marking, printing, or the like.
The display position is such that the flange 3 ′ of the radome 3 is in a state where the vertical wall contact pieces 5 d, 5 d at the tips of the arms 5 b, 5 b of the assembly jig 5 are in contact with the outer surface of the vertical wall 2 ′ of the reflector 2. The distance x between the outer edge of the radome and the tip edge of the radome mounting plate 4b of the radome mounting bracket 4 fixed to the reflecting mirror 2, that is, the positional relationship between the radome mounting bracket 4 and the radome 3 is confirmed. It is in a position where you can do it.
The scale 5e may be displayed on at least one of the arm portions 5b and 5b.

  This assembling jig 5 positions the radome 3 mounted on the reflecting mirror 2 so that the mirror surface accuracy of the reflecting mirror 2 is not deteriorated by bolting when the reflecting mirror 2 and the radome 3 are assembled and fixed. One or two are prepared for assembling the parabolic antenna 1 and are used for confirmation.

  The reflection mirror 2 and the radome 3 are assembled as follows.

First, the upper surfaces of the radome mounting plates 4b are placed on the upper surface of the radome mounting plate 4b at positions where the vertical walls 2 'of the opening periphery of the reflecting mirror 2 are spaced by 90 degrees, using the four radome mounting brackets 4. The state is adjusted in accordance with the opening surface of the reflecting mirror 2.
For this fixing, bolts 6... Are inserted into bolt holes 4 a ′, 4 a ′ of the reflector mounting plate 4 a and bolt holes 2 ″, 2 ″ of the vertical wall 2 ′ of the reflector 2. This is done by tightening the nuts 7.
The radome mounting bracket 4, which serves as a reference for determining the radome position, is close to the joint between the respective fan-shaped reflectors when the reflector 2 is assembled in a bowl shape by joining fan-shaped reflectors. Can be installed by selecting the position.

When the radome mounting brackets 4... Serving as the position determination reference are fixed, the radome 3 is placed on the reflecting mirror 2 and temporarily fixed to the four radome mounting brackets 4.
This temporary fixing is performed by aligning the bolt hole 3 ″ of the flange 3 ′ of the radome 3 with the bolt hole 4b ′ of the radome mounting plate 4b of the radome mounting bracket 4... Is carried out by screwing and tightening.

  As shown in FIG. 4, when the radome 8 is assembled into a bowl shape by joining radome plates 8 '.. The radome mounting bracket 4 in the vicinity of is used as a position determination reference similar to that determined above, and the radome 8 may be mounted on the reflecting mirror 2.

Next, the remaining radome mounting brackets 4... Are fixed to places other than the above four places on the vertical wall 2 ′ of the reflecting mirror 2. This fixing is performed by sliding the radome mounting bracket 4... Upward so that the radome mounting plate 4 b is in surface contact with the lower surface of the flange 3 ′ of the radome 3.
Subsequently, while adjusting the position so that the bolt holes 3 "and 4b 'are aligned, the bolts 6 ... and nuts 7 ... inserted into the bolt holes 3" and 4b' are tightened, and the radome 3 is Temporary fixing to the reflecting mirror 2 is completed.

  At the stage where temporary fixing is completed in this way, the assembly jig 5 is used, and a total of 8 or more radome attachments at intervals of 45 degrees or less including the four radome attachment brackets 4. At the position of the metal fittings 4..., The positional relationship between the reflecting mirror 2 and the radome 3 is confirmed by the assembly jig 5 and recorded.

To confirm the positional relationship, the fitting portion 5c of the assembly jig 5 is fitted to the radome mounting plate 4b of each radome mounting bracket 4... And the tips of the arms 5b and 5b of the assembly jig 5 are fitted. With the vertical wall contact pieces 5d, 5d applied to the outer peripheral surface of the reflecting mirror 2, that is, the outer surface of the vertical wall 2 ′, the outer edge of the flange 3 ′ of the radome 3 and the radome mounting bracket 4 fixed to the reflecting mirror 2 The distance (displacement) x with the tip edge of the radome mounting plate 4b is read by the scales 5e and 5e.

  If the displacement x at each location, that is, the positional relationship between the reflecting mirror 2 and the radome 3, is not within a predetermined range that does not cause distortion of the reflecting mirror 2 that affects the XPD characteristics, the position is adjusted again. Then, it is confirmed that the positional relationship is within a predetermined range.

After confirming each other's positional relationship and positioning as described above, all the bolts 6... Are stipulated separately in the instruction manual etc., taking care not to apply a force that shifts the positional relationship. The radome 3 is permanently fixed to the reflecting mirror 2 by tightening in accordance with the order.
Note that the force that shifts the positional relationship described here means that the radome 3 or the radome 3 is tightened by tightening the bolt when the flange 3 ′ is floating from the radome mounting plate 4 b of the radome mounting bracket 4. It means a force that the reflecting mirror 2 is attracted to cause distortion.

  After tightening all the bolts 6..., Read the scales 5 e and 5 e of the assembling jig 5 and check the difference between the pre-fixed reading and the reading before fixing. It is confirmed that the positional relationship after fixing is within the predetermined range, and the assembly is completed.

According to the above assembling method, the positional relationship between the reflecting mirror 2 and the radome 3 can be confirmed and adjusted easily before and after the main fixing. As a result, a special structure for position determination in advance or additional processing for position determination is not required, and only one or two jigs are prepared. In almost the same manner as in the similar assembling method, the assembling can be easily performed while suppressing the occurrence of distortion of the reflecting mirror, and further, sufficient electric characteristics for operation can be ensured.
In particular, when using a reflector that is shipped as a dismantled product, it is effective to perform on-site work without using special equipment for checking the assembly. In addition, the assembly in the place where the working environment is difficult to maintain can be facilitated.

  Next, a second embodiment of the present invention will be described.

In the method for assembling the parabolic antenna shown in the present embodiment, the scale is displayed directly on the radome mounting bracket itself without using the assembly jig separate from the radome mounting bracket as in the first embodiment. The positional relationship between the reflecting mirror 2 and the radome 3 is confirmed using the scale as a guide before and after.
The first embodiment is different from the first embodiment only in that the scale-displayed radome mounting bracket is used as the position confirmation means. The contents and steps to be confirmed are the same as those in the first embodiment. Explained and other explanations are omitted.

  The outer shape of the radome mounting bracket 9 is the same as that of the mounting bracket 4 of the first embodiment. Specifically, the radome mounting plate 9b is set at a right angle on one side edge (upper edge) of the reflector mounting plate 9a. It is a side L-shaped one that is connected.

The reflector mounting plate 9a has two vertically long bolt holes 9a 'and 9a', and the radome mounting plate 9b has one vertically long bolt hole 9b '.
The scales 9e and 9e for confirming the position of the flange 3 'of the radome 3 are displayed by printing or the like on the left and right edges of the upper surface of the radome mounting plate 9b within the required range from the tip. .

  At least eight radome mounting brackets 9 indicating the scale 9e are prepared for one parabolic antenna 1, and at the time of assembling the reflecting mirror 2 and the radome 3, at least the reflecting mirror 2 prior to the temporary fixing of the radome 3. The upper surface of the radome mounting plate 9b is aligned with the opening surface of the reflecting mirror 2 and fixed as a radome position determination reference at positions at 90 ° intervals on the vertical wall 2 ′ of the opening periphery.

After the radome 3 is temporarily fixed and after the main fixing, the distance between the outer edge of the flange 3 ′ of the radome 3 and the leading edge of the radome mounting plate 9 b of the radome mounting bracket 9... Is confirmed by the scales 9 e and 9 e. be able to.

  In each of the above embodiments, the four radome mounting brackets 4... (9...) Are used as the reference for determining the position of the radome 3, and the radomes are positioned at the four radome mounting brackets 4. 3, the positional relationship between the flange 3 'and the radome mounting bracket 4 (9 ...), that is, the positional relationship between the radome 3 and the reflecting mirror 2 was confirmed. Can be increased or decreased as appropriate.

It is a perspective view of the state just before assembling the reflector and radome of the parabolic antenna which concern on Example 1 of this invention. (A) is the principal part expansion perspective view of the state which mounted the radome on the said reflective mirror, (b) is the longitudinal cross-sectional view. (A) is a perspective view of a state where an assembly jig is applied to the outer peripheral surface of the reflecting mirror, (b) is an enlarged plan view thereof, and (c) is an enlarged view of a main part of (b). It is a perspective view of the state before an assembly of a 4-part radome and a reflecting mirror. It is a perspective view of the mounting bracket which concerns on Example 2 of this invention.

Explanation of symbols

2 Reflector 3 Radome 3 'Flange 4 Radome mounting bracket 5 Assembly jig (position check means)
5a Base part 5b Arm part 5c Fitting part 5e, 9e Scale 9 Radome mounting bracket (position confirmation means)
9a ', 9b' bolt hole

Claims (6)

In the method of assembling the parabolic antenna, the radome is bolted to a plurality of radome mounting brackets fixed to a plurality of locations around the opening periphery of the reflector, and the reflector and the radome are assembled.
The vertical position of the radome mounting bracket is determined by moving the radome mounting bracket in the vertical direction with respect to the bolt inserted through the vertically long bolt hole of the radome mounting bracket, and the radome mounting bracket is reflected by the bolt with the reflection. After fixing the position of the flange of the radome with respect to the plurality of radome mounting brackets by checking the scale displayed on the position confirmation means, the flange of the radome is bolted to the radome mounting bracket. The parabolic antenna assembly method is characterized in that it is fixed.   As a position confirmation means, a planar U-shaped assembly jig displaying a scale is provided separately from the radome mounting bracket, and this is fitted into the radome mounting bracket, and the radome with respect to the radome mounting bracket is fitted with the scale. 2. The method of assembling a parabolic antenna according to claim 1, wherein the position of said flange is confirmed.   The assembly jig has a plane U shape with a pair of arms extending from both ends of the base, and a scale is displayed on at least one of the arms, and the gap between the arms is fitted to the radome mounting bracket. The parabolic antenna assembling method according to claim 2, wherein the parabolic antenna is a fitting portion.   2. The parabolic antenna assembling method according to claim 1, wherein the position confirmation means confirms the position of the flange of the radome with respect to the radome mounting bracket by the radome mounting bracket itself having a scale on the upper surface. . The assembly jig of a parabolic antenna used to confirm their positional relationship during the assembly of the reflector and radome, with forming a flat U-shape which is extended a pair of arms from both ends of the base portion, vertical A scale for confirming the positional relationship between the radome mounting bracket and the radome flange fixed to the reflector by being moved in the vertical direction is displayed on at least one of the arm portions, and the space between the arm portions is displayed. A jig for assembling a parabolic antenna, characterized in that the fitting portion is fitted to the radome mounting bracket. An L-shaped side surface for fixing the radome to the reflector, which is connected to the one side edge of the reflector mounting plate having the bolt hole continuously bent at a right angle. In the radome mounting bracket, the bolt hole of the reflector mounting plate is vertically long and has a scale for checking the position of the flange of the mounted radome on the radome mounting plate. Parabolic antenna radome mounting bracket.

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