JP2514880B2 - Device for setting measuring points on parabolic antennas - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measuring point setting device for a large parabolic antenna used for satellite communication antennas, radio telescopes and the like.

[0002]

2. Description of the Related Art A large number of measuring points (targets) provided on a mirror surface are used to adjust and measure the mirror surface accuracy of a large parabolic antenna.
Is performed by measuring the depression angle from the water surface with an optical instrument installed in the center of the mirror surface. In addition, the installation of the measurement point,
It is carried out by measuring a straight line distance from a tape measure reference point installed with an optical instrument at the center of the mirror surface and marking on the mirror surface with a marking or a pencil. These measurement points are provided at several hundreds to several thousands depending on the diameter of the antenna. A metal tape (tape measure) is used to measure the linear distance, but the tension applied to the tape measure changes the slack error and extension error of the tape measure, so it is necessary to maintain the tape measure tension at a specified value for measurement. .

A conventional measuring device for setting measurement points on a parabolic antenna will be described with reference to FIG. As shown in the figure, an optical instrument 2 for measuring the depression / elevation angle from a horizontal plane and a tape measure reference point 9 as a reference point of a tape measure 4 are provided at the center of the parabolic antenna 1. After the worker A secures a foothold,
Tape measure case 4 with one end of tape measure 4 fixed to tape measure reference point 9
In order to keep the tension of the tape measure 4 at a specified value by holding the spring measure 7 connected to the tape measure case 4a and the tape measure case 4a with both arms, the spring measure 7 is adjusted while adjusting the tension so that the scale of the spring measure 7 shows the specified value. I'm pulling. For this work, it is necessary to match the breathing with the worker B, and at the time of the specified tension, the worker B sets the measurement point 8 by marking a mark on the mirror surface 1a.

[0004]

However, in the conventional measuring point setting device for the parabolic antenna, there is a large error in the tension due to the skill of the worker who pulls the tape measure with a constant tension, the accuracy of the spring back pressure, etc. Person's risk,
There is a problem that the degree of fatigue is high.

The present invention has been made in view of the above points, and eliminates the work involving danger, fatigue, and error, that is, the manual work of pulling a tape measure with a prescribed tension, and setting of a highly accurate measurement point. It is an object of the present invention to provide a device for setting a measurement point on a parabolic antenna that can efficiently perform.

[0006]

In order to solve the above problems, a measuring point setting device for a parabolic antenna according to the present invention is a straight line in a measuring point setting device which is a point for mirror surface precision adjustment and measurement of a large parabolic antenna. One end of the tape measure for measuring the distance is fixed to a tape measure reference point installed at the center of the mirror surface, and the tape measure case is hung outside the outer edge of the mirror surface by a tape measure tension device, and the tape measure tension device is framed from an angle and a plate. The pulley is inserted into the shaft provided on the, the tape measure is hung on this pulley, the tape measure tension device is hooked on the outer edge of the mirror surface, and the tape measure case is hung outside the outer edge of the mirror surface. A weight with a certain weight is provided, and the tape measure stretched between the tape measure reference point and the outer edge of the mirror surface is pressed to read the linear distance from the tape measure reference point. It is characterized in setting the measurement points by marks on the mirror surface.

[0007]

[Operation] It is necessary to set a measurement point on the mirror surface for adjusting and measuring the mirror surface accuracy of a large parabolic antenna. One end of the tape measure for measuring the linear distance is fixed to the tape measure reference point installed at the center of the mirror surface. The tape measure case is hung outside the outer edge of the mirror surface by a tape measure tension device, and a weight having a constant weight is attached to the tape measure case. The weight of the weight is the weight at which the tension of the tape measure reaches a specified value. The operator holds the tape measure stretched between the tape measure reference point and the outer edge of the mirror surface, reads the specified linear distance from the tape measure reference point, marks this linear distance on the mirror surface of the parabolic antenna, and sets the measurement point. In this way, since the tape measure is always stretched between the tape measure reference point and the outer edge of the mirror surface with the specified tension, it is possible to efficiently set the measurement point with high accuracy.

[0008]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view for explaining a measuring point setting device in a parabolic antenna according to the present invention. As shown in the drawing, an optical instrument 2 for measuring the depression / elevation angle from a horizontal plane and a tape measure reference point 9 serving as a reference point of the tape measure are provided at the center of the parabolic antenna 1. A tape measure case 4a, in which one end of the tape measure 4 is fixed to the tape measure reference point 9, is hung outside the parabolic antenna 1 via a tension device 10 provided on the mirror surface outer edge 1b. A weight 5 is attached to the tape measure case 4a.
The tension of the tape measure 4 is adjusted within a specified range by adjusting the weight of the tape. Prior to measurement, the weight 5 is connected to a tape measure reference point 9 by a spring barr and adjusted so as to have a specified tension.

By simply hanging the tape measure case 4a and the weight 5 from the mirror surface outer edge 1b via the tension device 10, the operator B reads the specified straight line distance d from the tape measure 4 and the mirror surface 1a.
The measurement point 8 is set by marking the top. Therefore, a constant tension can be constantly applied to the tape measure 4, an operator who pulls the tape measure 4 with a constant tension is not required, and extremely highly accurate marking can be efficiently performed.

FIG. 2 shows a tape measure tension device for applying a prescribed tension to the tape measure for implementing the measuring point setting device in the parabolic antenna of the present invention. The tape measure tension device 10 is framed by an angle 12a, an angle 12b and a plate 12c. The pulley 11 is inserted into the shaft 15 provided between the angles 12a. Further, a balancer 14 for maintaining the balance of the tape measure tension device 10 itself is attached to the angle 12a, and the angle 12b hooks the tape measure tension device 10 on the mirror surface outer edge 1b. Hang the tape measure 4 on the pulley 11 of the tape measure tension device 10,
The weight 5 is hung on the tape measure case 4a so that the tension of the tape measure 4 is kept within a certain specified value. The rope 13 connects the angle 12a and the tape measure case 4a so that the tape measure case 4a does not fall. As the weight 5, a weight (shuckle or the like) at the work site is used, and before the measurement, the spring taper is connected to the tape measure reference point 9 to adjust the tension so that the tension becomes a specified value. Balancer 1
4 can also be used at the work site (such as wood chips). The tape measure tension device 10 is simply hooked and placed on the mirror surface outer edge 1b, and the worker B can easily move it in the circumferential direction.

[0011]

As described above, the measuring point setting device in the parabolic antenna according to the present invention fixes one end of the tape measure for measuring the linear distance to the tape measure reference point installed at the center of the mirror surface, and measures the tape measure case. The tape measure is hung outside the mirror surface outer edge by a tape measure tension device, and a weight having a weight such that the tape measure tension becomes a specified value is attached to the tape measure case hung outside the mirror surface outer edge, and a tape measure stretched between the tape measure reference point and the mirror surface outer edge. Press to read the linear distance from the tape measure reference point, and set the measurement point by marking the specified linear distance on the mirror surface, so work that involves danger, fatigue, and error, that is, pull the tape measure with the specified tension. Eliminates the need for manual work and allows highly efficient setting of measurement points. Further, the tape measure tension device is simply hooked on the outer edge of the mirror surface, is easily attached, and can be easily moved in the circumferential direction. Therefore, the installation work is simple and efficient.

[Brief description of drawings]

FIG. 1 is an explanatory diagram illustrating a measuring point setting device in a parabolic antenna according to an embodiment of the present invention.

FIG. 2 is a tape measure tension device for applying a specified tension to the tape measure for implementing the measuring point setting device in the parabolic antenna of the present invention.

FIG. 3 is an explanatory diagram illustrating a measuring point setting device on a parabolic antenna in a conventional example.

[Explanation of symbols]

 1 Parabolic antenna 1a Mirror surface 1b Mirror outer edge 2 Optical instrument 4 Tape measure 4a Tape measure case 5 Weight 7 Spring barkari 8 Measuring point 9 Tape measure reference point 10 Tape measure tension device 11 Pulley 12a Angle 12b Angle 12 Plate 13 Rope 15 Balancer

Claims (1)

(57) [Claims] 1. A measuring point setting device for adjusting the mirror surface accuracy of a large-scale parabolic antenna and a measuring point setting point, wherein one end of a tape measure for measuring a linear distance is fixed to a tape measure reference point installed at the center of the mirror surface. The tape measure case is hung outside the outer edge of the mirror surface by means of the tape measure, the tape measure tension device is framed from an angle and a plate, a pulley is inserted into the shaft provided between the angles, the tape measure is hung on the pulley, and the tape measure tension device is applied to the mirror surface. Used by hooking on the outer edge, the tape measure case hung outside the mirror surface outer edge is provided with a weight having a weight such that the tape measure tension becomes a specified value, and the tape measure stretched between the tape measure reference point and the mirror surface outer edge is pressed to Measuring point on parabolic antenna characterized by reading the straight line distance from the tape measure reference point and setting the specified straight line distance on the mirror surface Setting device.