CN111707876A - A Two-axis Verticality Quick Adjustment Mechanism for Large Antenna Near Field Tester - Google Patents

Abstract

The invention discloses a two-axis verticality quick adjustment mechanism for a large antenna near-field tester, and relates to the technical field of an antenna near-field test system, including a horizontal mechanism, a vertical mechanism and a back frame. The top is slidably installed with a horizontal slide, and the top of the horizontal slide is fixedly installed with a vertical mechanism and a back frame. A triangular back frame is used to support the vertical mechanism, and a connecting piece is used to fix the vertical column at the waist. It is used as the support for rotation adjustment under the vertical column, and the verticality adjustment is carried out by adjusting the horn; it reduces the rigidity and precision requirements of the vertical mechanism, saves the cost and realizes the light weight, and at the same time, compared with the ordinary inverted "T" type structure , using the back frame structure as the support of the vertical column, increasing the fixed point at the upper end, improving the dynamic performance of the entire system, and adjusting the horn adjustment method through the laser tracker test, which has the advantages of rapidity and easy operation. .

Description

A Two-axis Verticality Quick Adjustment Mechanism for Large Antenna Near Field Tester

technical field

The invention relates to the technical field of antenna near-field test systems, in particular to a two-axis verticality quick adjustment mechanism for a large-scale antenna near-field tester.

Background technique

Antenna near-field tester is also known as "scanner". With the rapid development of aerospace technology, the performance requirements for airborne, missile-borne and spaceborne antennas are getting higher and higher. As an important measurement equipment for the development of high-performance antennas, antennas The role of near-field testers is increasingly important.

The antenna near-field tester is mainly composed of horizontal (X-axis) and vertical (Y-axis) mechanisms, and the two axes are orthogonal and vertical. The test probe is electronically controlled to move accurately along two axes according to a fixed curve. Due to the different bands and sizes of the antenna under test, there are different requirements for the scanning speed, positioning accuracy and scanning stroke. The antenna near-field tester is divided into specifications according to the vertical effective travel, mainly divided into large (>12m,), medium (4-8m), small (1-4m), ultra-small (0-1m).

Due to the needs of use, the vertical (Y-axis) of the antenna near-field tester needs to be orthogonal to the horizontal mechanism (X-axis). Generally, it is required that the verticality error of the two axes should be controlled at about 0.1mm at the maximum vertical stroke position. The traditional two-axis verticality adjustment method mainly relies on the adjustment of the installation and adjustment bolts under the vertical column, and relies on the rigidity of the column itself to achieve a small adjustment of the verticality.

The vertical mechanism of the large antenna near-field tester has a stroke of more than 12m, and because the vertical direction is the load in the horizontal direction, in order to control the power scale, it is necessary to achieve light weight as much as possible, usually the weight is about a few tons, so its rigidity is affected by the weight The limit is difficult to be infinite. At the same time, because the processing is usually in a horizontal state, due to the change of state, there must be a certain deflection deformation after erection, so that there is an error in the perpendicularity of the two axes, and the installation surface of the vertical mechanism also exists. A certain machining error will also make it difficult to guarantee the perpendicularity of the two axes. In conclusion, for large near-field test equipment, it is difficult to ensure the orthogonality accuracy, which has also become a difficulty in the development of large-scale antenna near-field testers.

SUMMARY OF THE INVENTION

In view of the problems existing in the prior art, the purpose of the present invention is to provide a two-axis verticality rapid adjustment mechanism for a large antenna near-field tester, which can realize the rapid adjustment of the verticality of the vertical mechanism and the horizontal mechanism, and has high The advantages of precision, speed, easy operation, and low risk can improve the lightweight level and overall dynamic performance of the entire system.

In order to achieve the above object, the present invention provides the following technical solutions: including a horizontal mechanism, a vertical mechanism and a back frame, the horizontal mechanism is the horizontal axis of the large antenna near-field tester, and is composed of two parallel horizontal bases and mounted on them. It is composed of horizontal guide rail and a series of driving equipment. At the same time, a horizontal sliding seat is slidably installed above the horizontal sliding rail of the horizontal mechanism, and the horizontal sliding seat moves horizontally along the horizontal sliding rail. At the same time, the vertical mechanism includes a vertical column and a vertical The guide rails take into account a series of driving equipment, wherein the vertical column is installed on the top of the horizontal slide, at the same time a set of vertical guide rails are installed on the back side wall of the vertical column, a slide plate is slidably installed on the vertical sliding rail, and the vertical mechanism A back frame is fixedly installed on the front, and the back frame is installed on the top of the horizontal sliding seat; three adjustment pad irons are fixedly installed at the top three corners of the horizontal sliding seat respectively, and the back frame is fixedly installed on the top of the adjustment pad iron, and at the same time the horizontal The left end of the sliding seat is fixedly installed with a central spherical hinge, the lower fixed part of the central spherical hinge is fixedly installed on the top of the horizontal sliding seat, and the upper fixed part of the central spherical hinge is fixedly installed on the bottom of the vertical column of the vertical mechanism.

As a further solution of the present invention, the vertical column of the vertical mechanism is a rectangular hollow tubular structure, and the vertical sliding plate is a plate-like structure, which is installed on the vertical guide rail pair by screwing.

As a further scheme of the present invention: the back frame is a triangular truss structure, and the lower end is installed on the adjustment pad iron, while the upper end of the back frame is reserved for the installation hole of the connecting plate for installing the vertical mechanism, and the vertical mechanism is installed through the connecting piece. It is fixedly installed on the side wall of the back frame.

As a further solution of the present invention: the central spherical hinge is an ordinary large bearing spherical joint, the upper and lower fixing parts can be disassembled, and both have mounting holes, and the maximum rotation angle range is 20 degrees.

As a further solution of the present invention: the spacer block is a cylindrical hollow structure, and the middle is used to pass through the installation screw.

As a further solution of the present invention: the adjusting pad is a special standard leveling mechanism for machine tools, and the height adjustment of the upper equipment is realized by manually rotating the screw.

As a further solution of the present invention: the present invention is equipped with a laser tracker, and the laser tracker is a FARO or other brand laser tracker or other equipment capable of verticality testing, and has a verticality testing function.

A two-axis verticality adjustment mechanism used on a large antenna near-field tester, the specific operation steps are as follows:

Step 1: First, install the three adjusting pads at the corresponding three corners of the horizontal slide;

Step 2: Install the back frame on the adjustment pad;

Step 3: Install the connector on the upper end of the back frame;

Step 4: Install the lower fixed part of the central spherical hinge at the corresponding position of the horizontal slide;

Step 5: Install the fixed part of the upper end of the central spherical hinge at the center of the lower end of the vertical column in the horizontal state of the vertical column;

Step 6: Erect the vertical column, install the upper fixing part of the central spherical hinge on the lower fixing part to ensure that the central spherical hinge can rotate freely;

Step 7: Fix the corresponding position of the upper end of the vertical column on the connector;

Step 8: Use the laser tracker to test the verticality of the two axes, and use the three adjustment pads under the back frame to make precise adjustments according to the inclination;

Step 9: Repeat the test for verticality, after passing the test, the adjustment is over;

Step 10: After adjustment, test the distance between the four corners of the lower end of the vertical column and the mounting surface of the lower end of the horizontal sliding seat, prepare spacers, and then screw in the fixing screws to ensure that the vertical mechanism is fixed smoothly.

Compared with the prior art, the beneficial effects of the present invention are:

(1) Reduce the rigidity and precision requirements of the vertical mechanism, making it easier to save costs and achieve lightweight;

(2) Compared with the common inverted "T" structure, the back frame structure is used as the support of the vertical column, and the upper fixed point is added, which can improve the dynamic performance of the entire system;

(3) Through the laser tracker test, the adjustment method of adjusting the pad iron has the advantages of rapidity, easy operation and low risk. At the same time, the invention is a general-purpose mechanism, which is not only suitable for vertical strokes with large strokes. Quick vertical adjustment of near-field testers or other similarly large-travel two-axis orthogonal devices.

Description of drawings

FIG. 1 is a schematic structural diagram 1 of the present invention.

FIG. 2 is a second structural schematic diagram of the present invention.

Fig. 3 is a partial enlarged view of part A of the present invention.

FIG. 4 is a partial enlarged view of B of the present invention.

FIG. 5 is a partial enlarged view of the C part of the present invention.

FIG. 6 is a schematic diagram of the structure of the central spherical hinge of the present invention.

FIG. 7 is a schematic diagram of the structure of the adjusting pad iron of the present invention.

As shown in the figure: 1. Horizontal mechanism, 2. Vertical mechanism, 3. Back frame, 4. Horizontal sliding seat, 5. Connecting piece, 6. Center spherical hinge, 61. Upper fixing part, 62. Lower fixing part, 7. Pad, 8. Adjust the pad.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms "installation", "provided with", "sleeve/connection", "connection", etc., should be understood in a broad sense, such as " Connection", which can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be an internal connection between two components. of connectivity. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

Referring to FIGS. 1 to 7 , in an embodiment of the present invention, a two-axis verticality quick adjustment mechanism for a large antenna near-field tester includes a horizontal mechanism 1 , a vertical mechanism 2 and a back frame 3 . The horizontal mechanism 1 is the horizontal axis of the large-scale antenna near-field tester, which consists of two parallel horizontal bases, horizontal guide rails installed on them, and a series of driving devices. At the same time, a horizontal sliding seat is installed above the horizontal sliding rail of the horizontal mechanism 1. 4, the horizontal slide 4 moves horizontally along the horizontal slide rail, while the vertical mechanism 2 includes a vertical column and a vertical guide rail and a series of driving equipment, wherein the vertical column is installed on the top of the horizontal slide 4, At the same time, a set of vertical guide rails are installed on the back sidewall of the vertical column, a slide plate is slidably installed on the vertical slide rail, and a back frame 3 is fixedly installed on the front of the vertical mechanism 2. Provide auxiliary support for the vertical mechanism 2; three adjustment pads 8 are fixedly installed on the top three corners of the horizontal slide 4, and the back frame 3 is fixedly installed on the top of the adjustment pads 8, while the horizontal slide 4 The left end part of the center spherical hinge 6 is fixedly installed with the center spherical hinge 6, the lower end fixed part 62 of the center spherical hinge 6 is fixedly installed on the top of the horizontal slide 4, and the upper end fixed part 61 of the center spherical hinge 6 is fixedly installed on the vertical mechanism 2. The bottom of the vertical column, so that the vertical mechanism 2 can rotate around the central spherical hinge 6.

Wherein, the vertical column of the vertical mechanism 2 is a rectangular hollow tubular structure, and the vertical sliding plate is a plate-like structure, which is installed on the vertical guide rail pair by screwing, and can move up and down along it.

The back frame 3 is a triangular truss structure, the lower end is installed on the adjustment pad iron 8, and the upper end of the back frame 3 is reserved for the installation hole of the connecting plate for installing the vertical mechanism 2, and the vertical mechanism is installed through the connecting piece 5. 2 is fixedly installed on the side wall of the back frame 3 to provide auxiliary support for the vertical mechanism.

Preferably, the central spherical hinge 6 is an ordinary large bearing spherical joint, the upper end fixing part and the lower end fixing part can be disassembled, and both have installation holes, and the maximum rotation angle range is 20 degrees.

Preferably, the spacer 7 is a cylindrical hollow structure, the middle is used to pass through the mounting screw, and the length is assembled according to the field measurement.

Preferably, the adjusting pad iron 8 is a special standard leveling mechanism for machine tools, and the height adjustment of the upper equipment is realized by manually rotating the screw.

Preferably, the present invention is equipped with a laser tracker. The laser tracker is a FARO or other brand laser tracker or other equipment that can realize verticality testing. It has a verticality testing function and can visually test the verticality. The out-of-tolerance position is convenient for quick adjustment of verticality.

Use the triangular back frame 3 for support, and use the connecting piece 5 to fix the vertical column at the waist; use the center ball hinge 6 to install under the vertical column as a support for rotation adjustment; use the adjustment pad 8 to adjust the verticality.

It should be noted that the working principles and installation methods of the driving devices in the horizontal mechanism 1 and the vertical mechanism 2 are all based on the prior art, which is the common knowledge of those skilled in the art, and will not be repeated here.

According to the above-mentioned preferred embodiment provided by the present invention, a two-axis verticality adjustment mechanism for a large antenna near-field tester, the specific operation steps are as follows:

Step 1: First, install the adjustment pads 8 (3 pieces) at the corresponding three corners of the horizontal slide 4;

Step 2: Install the back frame 3 on the adjustment pad iron 8;

Step 3: Install the connector 5 on the upper end of the back frame 3;

Step 4: Install the lower end fixing part of the central spherical hinge 6 on the corresponding position of the horizontal sliding seat 4;

Step 5: Install the upper end fixing portion 61 of the central spherical hinge 6 at the center position of the lower end of the vertical column under the horizontal state of the vertical column;

Step 6: erect the vertical column, and install the upper fixing part 61 of the central spherical hinge 6 on the lower fixing part 62 to ensure that the central spherical hinge 6 can rotate freely;

Step 7: Fix the corresponding position of the upper end of the vertical column on the connector 5;

Step 8: Use the laser tracker to test the verticality of the two axes, and use the three adjustment pads 8 under the back frame to make precise adjustments according to the inclination;

Step 9: Repeat the test for verticality, after passing the test, the adjustment is over;

Step 10: After adjustment, test the distance between the four corners of the lower end of the vertical column and the mounting surface of the lower end of the horizontal slide 4, prepare a spacer 7, and then screw in the fixing screws to ensure that the vertical mechanism 2 is fixed smoothly.

Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it is still possible to modify the technical solutions described in the foregoing embodiments, or to perform equivalent replacements for some of the technical features. Within the spirit and principle of the present invention, any modifications, equivalent replacements, improvements, etc. made should be included in the protection scope of the present invention, and the content not described in detail in this specification belongs to the knowledge of those skilled in the art of existing technology.

Claims (8)

1. a two-axis verticality quick adjustment mechanism for a large antenna near-field tester, comprising a horizontal mechanism (1), a vertical mechanism (2) and a back frame (3), it is characterized in that: the horizontal mechanism ( 1) It is the horizontal axis of the large antenna near-field tester, which consists of two parallel horizontal bases, horizontal guide rails installed on them, and a series of driving devices. The horizontal sliding seat (4) moves horizontally along the horizontal sliding rail, while the vertical mechanism (2) includes a vertical column and a vertical guide rail and a series of driving equipment, wherein the vertical column It is installed on the top of the horizontal slide (4), at the same time, a set of vertical guide rails are installed on the back side wall of the vertical column, the slide plate is slidably installed on the vertical slide rail, and the front side of the vertical mechanism (2) is fixedly installed with a back frame ( 3), the back frame (3) is installed on the top of the horizontal sliding seat (4); three adjustment pads (8) are fixedly installed on the top three corners of the horizontal sliding seat (4), and the back frame (3) It is fixedly installed on the top of the adjustment pad iron (8), and at the same time, the left end of the horizontal slide (4) is fixedly installed with a center spherical hinge (6), and the lower end fixing part (62) of the center spherical hinge (6) is fixedly installed on the The top of the horizontal sliding seat (4), and the upper end fixing part (61) of the central spherical hinge (6) is fixedly installed on the bottom of the vertical column of the vertical mechanism (2). 2. A two-axis verticality quick adjustment mechanism for a large antenna near-field tester according to claim 1, characterized in that: the vertical column of the vertical mechanism (2) is a rectangular hollow tubular structure, and simultaneously The vertical sliding plate is a plate-like structure and is installed on the vertical guide rail pair by screwing. 3. A two-axis verticality quick adjustment mechanism for a large antenna near-field tester according to claim 1, wherein the back frame (3) is a triangular truss structure, and the lower end is installed on the adjustment pad iron (8), and at the same time, the upper end of the back frame (3) reserves the mounting holes for the connecting plate for installing the vertical mechanism (2), and the vertical mechanism (2) is fixedly installed on the back frame (3) through the connecting piece (5). ) on the side wall. 4. A two-axis verticality quick adjustment mechanism for a large antenna near-field tester according to claim 1, characterized in that: the central spherical joint (6) is an ordinary large bearing spherical joint, and the upper fixed part is The fixed part and the lower end can be disassembled, and both have mounting holes, and the maximum rotation angle range is 20 degrees. 5 . The two-axis verticality quick adjustment mechanism for a near-field tester of a large antenna according to claim 1 , wherein the spacer ( 7 ) is a cylindrical hollow structure. 6 . 6. A two-axis verticality quick adjustment mechanism for a large antenna near-field tester according to claim 1, characterized in that: the adjustment pad iron (8) is a special standard leveling mechanism for machine tools, and is manually The rotating screw realizes the height adjustment of the upper equipment. 7. a kind of two-axis verticality quick adjustment mechanism for large antenna near-field tester according to claim 1, is characterized in that: the present invention is provided with laser tracker, and described laser tracker is FARO or other Brand laser tracker or other equipment that can realize verticality test, with verticality test function. 8. A two-axis verticality quick adjustment mechanism for a large antenna near-field tester according to claim 1, characterized in that: the two-axis verticality for a large antenna near-field tester To adjust the mechanism, the specific operation steps are as follows: Step 1: First, install the three adjusting pads (8) at the corresponding three corners of the horizontal slide (4); Step 2: Install the back frame (3) on the adjusting pad iron (8); Step 3: Install the connector (5) on the upper end of the back frame (3); Step 4: Install the lower end fixing part of the central spherical hinge (6) at the corresponding position of the horizontal slide seat (4); Step 5: Install the upper end fixing portion (61) of the central spherical hinge (6) at the center position of the lower end of the vertical column in the horizontal state of the vertical column; Step 6: erect the vertical column, and install the upper fixing part (61) of the central spherical hinge (6) on the lower fixing part (62) to ensure that the central spherical hinge (6) can rotate freely; Step 7: Fix the corresponding position of the upper end of the vertical column on the connector (5); Step 8: Use the laser tracker to test the verticality of the two axes, and use the three adjustment pads (8) under the back frame to make precise adjustments according to the inclination; Step 9: Repeat the test for verticality, after passing the test, the adjustment is over; Step 10: After adjustment, test the distance between the four corners of the lower end of the vertical column and the mounting surface of the lower end of the horizontal slide (4), prepare the spacer (7), and then screw in the fixing screws to ensure that the vertical mechanism (2) is fixed smoothly.

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