KR102400010B1 - jig measuring the center of a circle - Google Patents

Abstract

The present invention relates to a jig for measuring the center of a circle for measuring the center of the circle,
A main frame including a first frame, a second frame, and a coupling part to which the ends of the first frame and the second frame are rotatably coupled, the coupling part of the first frame and the second frame, and the coupling part provided at opposite ends A plurality of contact pins, a first sliding guide vertically connected to the center of the first frame, a second sliding guide vertically connected to the center of the second frame, and a first sliding guide and a second sliding guide at the intersection of the first sliding guide and the second sliding guide. and a sliding assembly including a sliding pin to be inserted.
The present invention also relates to a jig for measuring the center of a circle further comprising a rotary target to measure the direction of the object.

Description

Jig measuring the center of a circle

The present invention relates to a jig.

More specifically, it relates to a jig that measures the center of a circle using the principle that the bisector of a chord passes through the center of the circle.

The content described in this section merely provides background information on the embodiments of the present invention and does not constitute the prior art.

It is essential to select the correct location for equipment installation or processing. In order to select an exact location, the work is done in a way that a drawing is made on the corresponding surface and marked on the corresponding point, which is very cumbersome.

Accordingly, the following Patent Document 1 provides an installer for positioning of a jig that draws a position for machining of mechanical equipment, reduces the effort of marking, and enables easy positioning.

More specifically, the invention of the following Patent Document 1, as shown in Figure 1, the measurement scale 21 and the guide ball 22 formed in the valley 11 formed in the surface plate 10 to fix the machine is horizontal · By inserting and fixing the insertion piece 23 of the vertical measurer 20, a device capable of omitting the manual marking operation according to the existing drawing and drawing results is provided.

The present invention also provides a device capable of replacing the existing manual work such as drawing and display. However, the present invention relates to an apparatus for determining the center of a circle and easily measuring the normal vector of an object, and there is a difference from Patent Document 1 below, which selects only horizontal and vertical positions on a square plate on which a trough is formed.

An example of measuring the center of a circle and the normal vector of the plane of the circle is as follows.

The large hull is completed through a block assembly process that is divided into several blocks and then manufactured and mounted. In addition to the outer plate corresponding to the outer shape of the hull, various ship equipment such as pipes, converters and ducts as well as structural reinforcement such as longies and stiffeners are mounted on the block in an assembled state.

In the case of piping, it is absolutely necessary to measure whether the piping is installed in the correct position at each block assembly step so that the piping connection locations of both blocks coincide with each other when two blocks are mounted.

In the measurement step, the reference point of the pipe is to measure the cross section of the pipe connection part, generally the center of the pipe flange face, to determine whether to install the pipe in the correct position.

In the shipyard, various measurements related to blocks are mainly performed using a total station.

The total station is a rangefinder/goniometer that can simultaneously observe distance, vertical angle, and horizontal angle with one machine. It is a device capable of processing large amounts of calculations.

For accurate measurement, a target is attached to a location to be measured, and information on a plurality of locations can be obtained by measuring the relative distance and angle between the target and the total station to know the location relationship between each target.

Therefore, it is possible to install a target in the center of each pipe and check whether the positions of each target match through the total station.

Furthermore, in addition to the coincidence of the center, the direction of the pipe to be installed must also match, so it is necessary to determine the alignment of the pipe, which can use two targets. By arranging the two targets so that an imaginary straight line connecting the two targets is perpendicular to the flange surface of the pipe, and grasping the location information of the two targets, the normal vector of the flange surface can be measured.

Therefore, it is possible to check whether the alignment directions of the pipes are the same by comparing the normal vectors of the flange faces of the two pipes to be assembled.

In installing such a target, conventionally, the installation of the target was performed in a manner of installing a cover on the flange surface of a pipe, finding a center point through drawing on the cover surface, and attaching the target to the center point.

However, it is very laborious to install the cover, draw and mark by hand, and attach or install the target, which is a factor that increases the working time. In addition, when the cover surface is irregular, accurate measurement is difficult, and in order to measure the normal vector, there is also a problem in that it is impossible to install two targets so as to be exactly perpendicular to the flange surface.

Registered Patent Publication Registration No. “10-1500287”, title of invention “Centering jig of radiation measuring instrument”

The present invention was created to solve the above problems, and more specifically, to install a protective cover to find the center point of the circle, and to reduce the effort of drawing and displaying, the vertical line connecting two points of the circumference The purpose of bisector is to provide a device that can easily find the center of a circle by using the principle that it passes through the center of the circle.

Another object of the present invention is to provide an apparatus capable of easily installing a target for obtaining a normal vector of a pipe flange surface in order to grasp an alignment state of a pipe or the like.

The technical problems to be achieved by the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by those of ordinary skill in the art to which the present invention belongs from the description below. will be.

The jig for measuring the center of a circle of the present invention for achieving the above object uses the principle that the vertical bisector of the chord passes through the center point of the circle.

2, the perpendicular bisector CD of chord AB passes through the center of the circle, and the intersection of the perpendicular bisector GH and CD of another chord EF becomes the center point O of the circle.

The present invention utilizes the above-mentioned principle by allowing one string AB and one string EF to meet at a point.

The jig for measuring the center of the circle of the present invention,

A main frame including a first frame, a second frame, and a coupling part to which the ends of the first frame and the second frame are rotatably coupled, the coupling part of the first frame and the second frame, and provided at the opposite end of the coupling part A plurality of contact pins, a first sliding guide vertically connected to the center of the first frame, a second sliding guide vertically connected to the center of the second frame, and at the intersection of the first sliding guide and the second sliding guide and a sliding assembly including a sliding pin positioned thereon.

When the first frame and the second frame are positioned so that the contact pin is in contact with the circumference, the position of the sliding pin marks the center of the circle.

In addition, long holes are formed in the first sliding guide and the second sliding guide of the present invention, respectively, and the sliding pin is inserted at the intersection of the long holes to move along the long holes.

In addition, the present invention uses the principle of knowing the slope of the straight line through the equation of the straight line passing through two points.

That is, the position of the two-point rotary target is identified with the total station, and the alignment state of the object to be measured, such as a pipe, can be known through the inclination of a straight line connecting the two targets.

Accordingly, the rotary target may be coupled to the sliding pin of the present invention, and the rotary target may include a frame, and a target plate rotatably installed inside the frame.

In addition, the frame of the rotary target of the present invention includes a base frame coupled to the sliding pin, and a connection frame extending vertically from both ends of the base frame, and the connection frame is provided with a mounting hole for installing the target plate, the target plate It may be rotatably installed with the installation tool as an axis.

In addition, the first frame of the present invention, the second frame, characterized in that provided with a magnet at least one of the contact pins.

The jig for measuring the center of the circle of the present invention,

When working using the center point of a circle, you can find the center point of the circle without going through the manual work of drawing and marking.

In addition, there is no need to separately install a target for comparing the center point of a circle.

In addition, it is easy to install a target for measuring a normal vector perpendicular to the surface of an object, and when the rotary target of the present invention is used in combination with the jig for measuring the center of the circle of the present invention, the target installation is unnecessary.

In addition, by providing a magnet, it is possible to install and use a jig even when the surface to be measured is vertical.

In addition, scale is displayed on the sliding guide, so it is easy to grasp the radius of the circle to be measured.

In addition, in installing the jig of the present invention on a circular object, it can be used for the inner or outer diameter of the circle, so an advantageous method can be adopted according to the working environment, and it is practical because it can be used for objects having various diameters.

1 is a view showing the prior art for finding the horizontal and vertical positions of the square surface plate.
2 is a view showing that the perpendicular bisector of the chord passes through the center of the circle.
3 is an exploded perspective view according to an embodiment of the present invention.
4 is an exploded perspective view showing that a two-point rotary target and a magnet are coupled as an embodiment of the present invention.
5 is a diagram showing an embodiment in which the present invention is applied to the outer diameters of circles having different diameters.
6 is a view showing an embodiment in which the present invention is applied to the inner diameter of a circle.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this process, the size or shape of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, terms specifically defined in consideration of the structure and operation of the present invention are only for describing the embodiments of the present invention, and do not limit the scope of the present invention.

In adding reference numerals to the components of each drawing, it should be noted that the same components are given the same reference numerals as much as possible even though they are indicated on different drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

Hereinafter, it will be described with reference to FIG. 3 . The jig (1) for measuring the center of the circle of the present invention includes a main frame (100), a contact pin and a sliding assembly (300).

A contact pin is coupled to the lower portion of the main frame 100 , and the sliding assembly 300 is coupled to the upper portion of the main frame 100 .

In measuring the center of the circle, the main frame 100 serves as a chord, the contact pins become both end points of the chord, and the sliding assembly 300 is provided to serve as a perpendicular bisector of the chord.

The main frame 100 includes a first frame 110 , a second frame 120 , and a coupling unit.

In the coupling portion, the ends of the first frame 110 and the second frame 120 are rotatably connected, and the coupling portion includes a hinge shaft 130 . Therefore, the first frame 110 and the second frame 120 can be operated in a manner that increases or decreases the angle between the.

The first frame 110 and the second frame 120 may be formed in the form of a rod, and when the two frames are assembled, they may be formed to have the same upper surface height as the assembled whole. For example, as shown in FIG. 3 , the connected portion of the first frame 110 and the second frame 120 has jaws in opposite directions to each other, and the coupled portion has no jaws. It may be formed to be the same as the height of the frame.

In addition, in order to be able to rotate at a smaller angle when rotating in a direction to reduce the angle between the first frame 110 and the second frame 120, the first frame 110 and the second frame ( 120) may be formed to be narrow.

For example, as shown in FIG. 3 , the inner portion of the connecting portion of the first frame 110 and the second frame 120 may be inclined.

In addition, any one of the first frame 110 or the second frame 120 may include an installation stand 140 corresponding to the height of the sliding guide in order to install the sliding guides to be described later on top of each other.

Since the sliding guide is installed at a position that bisects the first frame 110 and the second frame 120 , the mounting table 140 may be provided at a position that bisects the main frame 100 . More preferably, the mounting base 140 may be provided at a position that bisects the distance between the two contact pins 200 coupled to the first frame 110 and the second frame 120 .

The contact pin 200 coupled to the main frame 100 is for fixing the position in contact with the inner or outer diameter of the circle to be measured in the present invention.

A plurality of contact pins 200 may be provided, and may be installed on the hinge shaft 130 or an end opposite to the hinge shaft 130 .

As an embodiment, the contact pin 200 may include a first contact pin 210 , a second contact pin 220 , and a third contact pin 230 coupled to the main frame 100 .

In this case, the first contact pin 210 may be installed on the hinge shaft 130 to serve as a hinge. Also, the second contact pin 220 may be installed at an end of the first frame 110 , and the third contact pin 230 may be installed at an end of the second frame 120 .

The sliding assembly 300 includes a first sliding guide 310 , a second sliding guide 320 , and a sliding pin 330 .

The first and second sliding guides 310 and 320 are vertically connected to the first frame 110 and the second frame 120 at positions dividing the main frame 100 into halves, respectively. In addition, the first and second sliding guides 310 and 320 may have long holes 311 and 321 through which the sliding pins 330 are inserted and slidable. Also, a scale may be formed on each sliding guide to compare the size of a circle to be measured.

According to the above-mentioned principle, when using the jig 1 for measuring the center of a circle of the present invention, the intersection of the first and second sliding guides 310 and 320 becomes the center point of the circle. A sliding pin 330 may be inserted into the measured center point, and the sliding pin 330 may be inserted into a hole formed by intersecting the long holes 311 and 321 formed in the first and second sliding guides 310 and 320 .

Since the position of the crossing point changes by changing the angle between the first frame 110 and the second frame 120 according to the diameter of the circle, the sliding pin 330 moves along the long holes 311 and 321 when the position of the central point changes. move by sliding

As an embodiment of the present invention, as shown in FIGS. 4 to 6 , a rotary target may be installed on the sliding pin 330 .

The rotary target includes a frame 410 , a target plate 420 , and a mounting hole 414 connecting the frame 410 and the target plate 420 .

Hereinafter, as an embodiment of the present invention, a two-point rotary target 400 having two targets 421 will be mainly described.

The frame 410 includes a base frame 411 coupled to the sliding pin 330 through a coupling hole 412 and two connecting frames 413 extending vertically from the base frame 411 .

Based on the first and second sliding guides 310 and 320 , the sliding pin 330 may be coupled at the bottom and the base frame 411 at the top.

Each connection frame 413 is provided with two installation holes 414 to which the target plate 420 can be coupled to the upper and lower portions.

The two target plates 420 may be installed side by side so as to be rotatable in the installation hole 414 formed in the two connection frames 413 . In addition, the center point of the target plate 420 (hereinafter, 'target 421') is marked so as to be identifiable. For example, a shape such as a target may be displayed.

The two-point rotary target 400 is installed so that the two targets 421 form a straight line. More preferably, the center point of the circle and the two targets 421 are installed to form a straight line.

As an embodiment, the two-point rotary target 400 may be connected to the sliding assembly 300 in a direction perpendicular to the surface to be measured by the sliding pin 330 . In this case, since the virtual straight line connecting the two targets 421 becomes the normal of the circle to be measured, the direction of the object to be measured can be known by grasping the location information of the target through equipment such as the total station 700. . This is shown in FIG. 6 .

In addition, since the target plate 420 is rotatably connected, the equipment such as the total station 700 can easily grasp the position of the target 421 from either side by adjusting the direction of the target plate 420 . The related contents are shown in FIG. 6 . Even if the target plate 420 is rotated, the position of the target 421 is always inside the normal line of the circle, so that the calculation of the direction of the object is not affected.

In addition, since the separation distance from one of the two targets 421 to the plane forming the circle to be measured is determined by the design, in the coordinates of the target 421 measured in advance to obtain the normal vector, the separation distance is By adding related information, the coordinates of the center of the circle can be obtained in detail.

Although the description of the present invention has been described based on the two-point rotary target 400, the number of targets 421 may be changed as needed.

In addition, Figure 4 is shown that the present invention for measuring the center of the circle jig (1) may include a magnet (500). Therefore, it can be stably attached to the object to be measured. As an embodiment, the magnet 500 may be inserted into the main frame 100 or the contact pin 200 , or may be coupled to the outside.

By including the magnet 500, it is possible to stably measure the center point of the circle even when the surface of the circle to be measured is vertical or the lower surface of the circle placed horizontally.

As shown in FIG. 5, the present invention can be installed on either the inner or outer diameter of the circle to accurately obtain the center point of the circle. Therefore, it adds flexibility to the working environment.

For example, when the present invention is used for the inner diameter of a circle to be used, first, the first frame 110 is positioned so that the first contact pin 210 and the second contact pin 220 are in contact with the inner diameter of the circle. Then, the first sliding guide 310 is positioned to pass through the center point of the circle. Then, the second frame 120 is spread so that the third contact pin 230 abuts at a different position of the inner diameter. Then, the second sliding guide 320 is also positioned to pass through the center point of the circle, and the position of the sliding pin 330 inserted at the intersection of the first and second sliding guides 310 and 320 becomes the center point of the circle.

Conversely, when using the present invention for the outer diameter of the circle, after positioning the first frame 110 so that the first contact pin 210 and the second contact pin 220) are in contact with the outer diameter of the circle, the third contact pin ( The second frame 120 is moved so that the 230 is in contact with another part of the outer diameter. Similarly, the portion where the sliding pin 330 is finally positioned becomes the center point of the circle.

Also, the present invention can be used for circles having various diameters, as shown in FIG. 6 .

For example, when measuring the center of a circle with a large diameter, the angle between the first frame 110 and the second frame 120 is increased so that each contact pin 200 can be used in contact with the inner or outer diameter of the circle. there is.

Conversely, when measuring the center of a circle having a small diameter, the angle between the first frame 110 and the second frame 120 is reduced to allow each contact pin 200 to be in contact with the inner or outer diameter of the circle.

Although the present invention has been shown and described in relation to specific embodiments, it is within the art that the present invention can be variously improved and changed without departing from the spirit of the present invention provided by the following claims. It will be obvious to those of ordinary skill in the art.

1: Jig for measuring the center of a circle
10: table 11: goal
20: horizontal and vertical ruler 21: scale
22: guide ball 23: insertion piece
100: main frame 110: first frame
120: second frame 130: hinge shaft
140: mounting table 200: contact pin
210: first contact pin 220: second contact pin
230: third contact pin 300: sliding assembly
310: first sliding guide 320: second sliding guide
311,321: long hole 330: sliding pin
400: 2-point rotary target 410: frame
411: base frame 412: coupler
413: connection frame 414: installation hole
420: target plate 421: target
500: magnet 600: object to be measured
700: total station

Claims (5)

first frame,
second frame and
a main frame including a coupling portion to which ends of the first frame and the second frame are rotatably coupled;
a plurality of contact pins provided at the coupling portion of the first frame and the second frame and opposite ends of the coupling portion; and
a first sliding guide and a second sliding guide vertically connected to the center of the first frame and the second frame, respectively;
A sliding pin positioned at the intersection of the first sliding guide and the second sliding guide,
A rotary target is coupled to the sliding pin, and the rotary target includes a frame and a target plate rotatably installed inside the frame,
The rotary target is composed of a two-point rotary target having two targets to form a straight line up and down,
The frame includes a base frame coupled to the sliding pin, and a connection frame extending vertically from both ends of the base frame, and the connection frame is provided with a mounting hole for installing the target plate, and the target plate is installed Rotatable around the sphere,
A jig for measuring the center of a circle having a magnet on any one or more of the first frame, the second frame, and the contact pin.
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