JPH0533048Y2 - - Google Patents

Description

[Detailed description of the invention] [Summary] The present invention relates to an assembly jig for a corrugated conical horn that improves dimensional accuracy and roundness (perfect conicity) when assembling a corrugated horn for a wireless communication antenna. This is a jig for assembling a corrugated conical horn, which is formed by stacking multiple stepped ring-shaped horn pieces with individual external dimensions to form a cone, and is intended to improve the roundness and dimensional accuracy of the corrugated conical horn. The purpose of the present invention is to provide an assembly jig for a corrugated conical horn, in which horn pieces of different diameters are sequentially stacked and joined to each other to assemble one piece, and the corrugated conical horn is assembled vertically at respective positions equally dividing the outer circumferential surface of the corrugated conical horn. at least three guide blocks each having a conical tapered surface on the inside that forms a conical guide hole for coaxially guiding and aligning the horn pieces, and a connecting split ring that connects the plurality of guide blocks and supports the framework. and a tightening block whose one end is attached to each of the guide blocks and whose other end supports at least the large-diameter end of the corrugated conical horn in the axial direction.

[Industrial application field]

The present invention relates to an assembly jig for a corrugated conical horn that improves dimensional accuracy and roundness when assembling a corrugated horn for a wireless communication antenna.

In recent years, with the amazing progress of wireless communications, especially satellite communications, the frequencies used for these satellite communications are becoming higher and higher (wavelengths shorter), and the antennas used are also parabolic antennas. The beam of the horn is rotationally symmetrical,
A corrugated conical horn with low sidelobe levels and low cross-polarized components is used, but this horn has a complex structure and requires high dimensional accuracy, especially roundness, but there are difficulties in manufacturing. Therefore, there is a strong demand for the development of an assembly jig for corrugated conical horns that can improve overall length dimensional accuracy and roundness.

[Conventional technology]

Figure 3 is a diagram illustrating a conventional corrugated conical horn, in which figure a is a sectional side view of the main part of one manufactured by cutting, and figure b is a side sectional view of a main part manufactured by stacking many ring-shaped horn pieces and brazing. It is a sectional side view of the main part of the thing.

Fig. 3a shows a corrugated cone made of aluminum or copper alloy formed into a truncated conical cylinder shape, with a plurality of circumferential grooves 13 formed by cutting on the inner wall surface along the conical shape to form a corrugate. This is horn 1.

Fig. 3b shows a horn piece 2 made of aluminum or copper alloy, formed into a stepped ring shape, and stacked by fitting each other with each other to form a conical tube shape, with the outside lined with silver. This is a corrugated conical horn coated with wax and heat bonded.

[Problem that the invention attempts to solve]

Among the conventional corrugated conical horns mentioned above, the former, that is, the corrugated conical horn manufactured by cutting, has high precision in overall length and roundness, but the width of the groove (B shown in Figure 3a) 0.5~3
Forming grooves with a precision of about 1.0 mm on a conical tapered surface requires a large amount of work equipment and man-hours, and is expensive. The attached corrugated conical horn had a problem in that the overall length changed due to thermal expansion during heat bonding, and good roundness could not be obtained, resulting in poor antenna characteristics.

[Means for solving problems]

The present invention solves the above-mentioned problems and provides a corrugated conical horn assembly jig that can achieve high overall length dimensional accuracy and roundness.

That is, it is an assembly jig for a corrugated conical horn that is assembled into one piece by sequentially stacking horn pieces of different diameters and joining them to each other. at least three guide blocks each having a conical tapered surface on the inside that forms a conical guide hole for coaxially guiding and aligning the horn pieces; and a connecting split ring that connects the plurality of guide blocks and supports the framework. This problem is solved by comprising a tightening block having one end attached to each of the guide blocks and the other end supporting at least the large diameter end of the corrugated conical horn in the axial direction.

[Effect]

The corrugated conical horn assembly jig is framed by at least three guide blocks and a connecting split ring, so that the envelope surface connecting the conical tapered surfaces inside the combined guide blocks 3 forms a conical guide hole. Since the horn pieces that are sequentially stacked using this as a guide are supported and centered at at least three points, the horn pieces can be coaxially aligned with good circularity.

Furthermore, since the side end of the last large-diameter horn piece is axially tightened and fixed with a tightening block, the overall length can be regulated.

Then, when the joints between each horn piece are joined with the total length regulated, the guide blocks do not cover the entire outer circumference of the corrugated conical horn, but instead provide a space between the guide blocks, allowing the joining material to flow easily. It flows over the entire area of the surface (joint surface) and blends in uniformly without stopping in one part, making it possible to improve the accuracy of the overall length of the corrugated conical horn.

Since the corrugated conical horn can be integrally manufactured by joining and taken out from the jig, the jig can be used repeatedly.

Therefore, the overall length of the corrugated conical horn and the concentricity between the horn pieces, that is, the overall circularity, can be highly accurate, and the antenna characteristics can be improved.

〔Example〕

FIG. 1 is a diagram explaining the first embodiment of the present invention, in which a is a front view showing a cross section of the main part, b is a left side view, c is a right side view, and d is one connecting flange. e is an enlarged sectional view of the other connecting flange, f is a perspective view of the guide block, g is a plan view of the split ring for coupling, h is a side view of the split ring for coupling; Parts that are equivalent to those in the figure are given the same reference numerals.

In the figure, each horn piece 2 is a copper alloy annular member having a hole in the center and a stepped part around which the inner and outer diameters fit, and the stepped parts are fitted together and stacked to form a conical cylinder. Forms a corrugated conical horn.

Then, the inner surface is made into a conical taper surface corresponding to the outer conical shape of the corrugated conical horn so as to regulate the circularity (perfect conicity) of three or more (three in the drawing) on the outer circumference, A guide block 3 made of stainless steel or the like, shown in FIG.

A coupling split ring 4 (three pieces form a ring) made of stainless steel or the like as shown in FIG. 4 hole 4
When the screw holes 32 of the guide block 1 and the guide block 3 are aligned and fixedly clamped with the tightening screw 14, the outer surface of the guide block is made parallel to the axis, so the outer shape of the assembly jig is the same as that of the three guide blocks 3. The envelope surface connecting the outer surfaces of the tube has a cylindrical shape with equal diameter, and the envelope surface connecting the inner conical tapered surfaces forms a conical guide hole.

Furthermore, connecting flanges 5 and 6 are attached to both ends of the conical cylinder shape in which the horn pieces 2 are fitted together and stacked, and hook-shaped flanges 5 and 6 are attached to each end to regulate the overall length of a plurality of (three pieces are shown in the drawing) each. Tightening block 7
It is fixed to the guide block 3 with a tightening screw 14 by hooking the hook portions of 8 and 8.

Next, in this state, a brazing material such as silver solder is applied to the outer periphery of the seam where the horn pieces 2 are stacked, and the horn pieces 2 are heated in a vacuum furnace or an inert gas furnace to braze and join.

In this way, the overall length and outer shape of the horn piece and connection flange assembly are fixed by the jig, so the roundness (concentricity) and overall length after brazing are defined with high precision.

FIG. 2 is a diagram explaining the second embodiment of the present invention, in which a is a front view showing a cross section of the main part, b is a left side view, c is a right side view, and d is one connection flange. e is an enlarged sectional view of the other connecting flange, f is a perspective view of the guide block, g is a plan view of the coupling split ring, h is a side view of the coupling split ring, and Parts that are equivalent to those in the figure are given the same reference numerals.

In the figure, each horn piece 2 is a copper alloy annular member having a hole in the center and a stepped part around which the inner and outer diameters fit, and the stepped parts are fitted together and stacked to form a conical cylinder. Forms a corrugated conical horn.

Next, three or more pieces (three or more in the drawing) are placed around the outer circumference.
2) on the outside to regulate the roundness of the
A guide block 3' made of stainless steel or the like is provided with a plurality of stepped portions 31' on the outside in a shape corresponding to the conical taper as shown in Fig.
Vertically abuts against.

Split rings 4' (three rings form a ring) made of stainless steel or the like as shown in Fig. 2g and h are attached to multiple locations (two locations are shown in the drawing) in the central portion of the guide block 3'. When they are wound so as to fit into each of them, the hole 41' of the split coupling ring 4' and the screw hole 32 of the guide block 3' are aligned, and they are fixedly clamped with the tightening screws 14, the three guide blocks 3' are assembled. The envelope surface connecting the outer surfaces of is cylindrical as in the previous embodiment, and a conical guide hole is formed inside.

Furthermore, a connecting flange 5 is attached to one end of the conical tube shape in which the horn pieces 2 are fitted together and stacked.
and hook the hooks of a plurality of hook-shaped tightening blocks 9 made of tool steel (three shown in the figure) to the guide block 3'.
4 to securely clamp it.

A connecting flange 6 is attached to the other end, and consists of a plurality of long (three in the drawings shown) hook-shaped tool steel etc. that protrude through a holding metal fitting 15, and an adjustment bolt 11 and a nut are attached to the hook part. Attach the tightening block 10 with the guide block 3' with the tightening screw 14.
Clamp it firmly.

Then, with the nut 12 of the adjustment bolt 11 provided on the tightening block 10 loosened, the adjustment bolt 11 is connected to the guide block 3' by the connecting flange 6.
After adjusting the overall length of the corrugated conical horn by tightening until they are in tight contact, lock each nut 12.

Next, in this state, a brazing material such as silver solder is applied to the outer periphery of the seam where the horn pieces 2 are stacked, and the horn pieces 2 are heated in a vacuum furnace or an inert gas furnace to braze and join.

In this way, the overall length and external shape of the horn piece and connection flange assembly are fixed by the jig, so in this example as well, the roundness and overall length after brazing can be specified with high precision. Ru.

In this corrugated conical horn assembly jig, the roundness is determined by a guide block 3' and a connecting split ring 4', and the overall length is determined by adjusting bolts 11 attached to connecting flanges 5, 6 and a tightening block 9. Since it can be adjusted, a corrugated conical horn with high dimensional accuracy can be realized and the antenna characteristics can be improved.

Either the jig may be assembled by applying the individual pieces of the jig in a state where the corrugated conical horns are stacked, or the jig may be assembled first and then the horn pieces 2 may be assembled.

The minimum elements of the jig are a guide block 3, a connecting split ring 4, and a tightening block that presses and supports the large diameter side of the horn in the axial direction. This means that the end on the smaller diameter side does not necessarily need to be supported. That is, since the inner side of the assembled guide block forms a conical tapered surface, the horn pieces, which are stacked annular members, are restricted by the conical tapered surface and do not move in a direction smaller in diameter than the conical tapered surface. Therefore, it is sufficient to press and support the large diameter end face.
Such a pressing support means is provided with a tightening block 10, an adjusting bolt 11, and a holding fitting 15 shown in FIG. The directional dimensions can be optimally determined. Of course, providing the pressing support means at both ends brings about more favorable effects.

The above applies regardless of whether or not a corrugated conical horn has flanges on both sides. The minimum condition is that there is no flange, and it includes being attached to either or both.

The dimensions in the length direction are determined so as to provide a gap through which the brazing material for joining the horn pieces uniformly flows. Of course, this is determined by the joining temperature of the brazing filler metal.

In the embodiment, the split ring 4 for coupling is provided at the middle part of the guide block 3, but in order to stabilize the size and shape, it is preferable to provide it at both ends. Circularity is accurately imparted to the jig.

In this embodiment, stainless steel was used for the guide block, the coupling split ring, and the holding fitting, but the material is not limited to stainless steel, and may be made of heat-resistant tool steel or the like.

[Effect of idea]

As is clear from the above explanation, according to the present invention, since the corrugated conical horns are joined while regulating the roundness and overall length, the roundness and overall length are highly accurate, and the antenna characteristics are improved. do.

[Brief explanation of the drawing]

FIG. 1 is a diagram explaining the first embodiment of the present invention, in which a is a front view showing a cross section of the main part, b is a left side view, c is a right side view, and d is one connecting flange. e is an enlarged sectional view of the other connecting flange, f is a perspective view of the guide block, g is a plan view of the split ring for coupling, h is a side view of the split ring for coupling, Fig. 2 These are diagrams explaining the second embodiment of the present invention, in which figure a is a front view showing a cross section of the main part, and b is a front view showing a cross section of the main part.
is a left side view, c is a right side view, d is an enlarged sectional view of one connection flange, e is an enlarged sectional view of the other connection flange, f is a perspective view of the guide block, and g is a joint split. Fig. 3 is a diagram explaining a conventional corrugated conical horn, Fig. 3 is a side sectional view of the main part after cutting, and b is a side view of horn pieces stacked up. FIG. In the figure, 1 is a corrugated conical horn, 2 is a horn piece, 3 and 3' are guide blocks, 4 is a split ring for coupling, 5 and 6 are flanges for connection, 7,
8, 9, 10 are tightening blocks, 11 is an adjustment bolt, 12 is a nut, 13 is a groove, 14 is a tightening screw,
15 is a presser metal fitting, 31' is a stepped part, 32 is a screw hole,
41 and 41' indicate holes, respectively.

Claims (1)

[Claims for Utility Model Registration] An assembly jig for a corrugated conical horn that is assembled into one piece by sequentially stacking horn pieces 2 of different diameters and joining them to each other, wherein each of the corrugated conical horn pieces 2 is assembled into one piece by equally dividing the outer peripheral surface of the corrugated conical horn. The plurality of guide blocks 3 are coupled to at least three guide blocks 3 having a conical tapered surface on the inside that forms a conical guide hole that coaxially guides and aligns the horn pieces 2. and a fastening block 8 which has one end attached to each of the guide blocks 3 and the other end which supports at least the large diameter side end of the corrugated conical horn in the axial direction. A corrugated conical horn assembly jig featuring: