KR101110847B1 - Device for noncontact measurement - Google Patents

Abstract

An apparatus for measuring the shape of an object to be measured in a work area in which at least three first positioning means for transmitting or receiving a position signal are distributedly arranged, the apparatus being distributed over the main frame and receiving or transmitting a position signal At least three second positioning means, a laser distance measuring sensor coupled to the main frame to measure the distance to the object under test, a support for supporting the main frame, and installed between the main frame and the support, It provides a non-contact shape measuring device comprising a tilting unit for tilting the main frame to the axis of rotation of the two perpendicular to the center of rotation, even if the position of the non-contact shape measuring device in the process of measuring the shape of the object to be measured Since the initialization operation for setting the position may not be performed again, the shape of the object to be measured is easily The measurement can be made easily, and the time required for the measurement can be saved.

Non-contact Shape Measurement, LDS

Description

Non-contact shape measuring device {DEVICE FOR NONCONTACT MEASUREMENT}

The present invention relates to a non-contact shape measuring device.

Large vessels such as oil tankers, container ships, and LNG carriers are completed by assembly and mounting after each part is manufactured in a block state. However, in order for a ship to be built in the designed shape, the block, which is a part thereof, must be manufactured in the designed dimension, and the block must be assembled and mounted within a certain error range.

In general, since the blocks are assembled to each other by welding, it is difficult to modify them once the blocks are assembled to each other. Therefore, before assembling the block, it must first be checked that the dimensions are constructed as designed.

In particular, the surface corresponding to the shell plate portion of the vessel of the block is a part forming the hull and should be measured more accurately. At this time, since the assembly and mounting of the block is made from the bottom of the vessel in the upward direction, it is important to measure the dimensions of the top seam (hereinafter referred to as the 'top seam') when the block is assembled and mounted in the shell plate. Do.

However, the block is large in size and complex in shape, and it is very difficult and dangerous for a worker to directly measure a spatial shape using a measuring tool such as a tape measure. Therefore, a non-contact distance measuring sensor is used to measure the dimensions of the block, and as such a distance measuring sensor, a laser distance sensor (LDS) is usually used.

The laser range finder attaches a plurality of target papers to the surface of the object to be measured, emits a laser beam toward the target paper, and measures the distance by measuring the time taken for the laser beam to be reflected back by the target paper.

In order to measure the dimensions of each part of the block, that is, the shape of the block with such a laser range finder, the target paper is attached to the main part of the block, and the distance to each target paper is measured with the laser range finder, and then each part of the block is measured. The three-dimensional coordinate value of is calculated to determine the manufacturing accuracy (block) of the block.

However, part of the shell plate or the part such as the top seam often protrudes from the block. The protruding portion blocks the laser beam of the laser range finder and cannot emit the laser beam to the target to be measured. There is a case. In addition, the position between the laser range finder and the block may be blocked by various equipment installed in the workplace. If the location of the target site cannot be measured, the manufacturing state of the block cannot be accurately understood, and thus, the construction of the ship may be delayed or a large error may occur during the assembly of the ship.

Therefore, when the laser beam emitted from the laser range finder does not reach the target attached to the block, the position of the target is measured after moving the laser range finder to a position where the laser beam can reach the target.

However, whenever the position of the laser range finder is changed, it is cumbersome to perform the initializing operation to reset the reference coordinates each time to coordinate the position of the target location measured in the work area, that is, the work place. The disadvantage is that the time required to measure the dimensions of the block is increased by the time required for.

The present invention has been made to solve the above disadvantages, according to the present invention there is provided a non-contact shape measuring device that does not need to perform the initialization again even if the position is changed to measure the position of the obscured portion of the object to be measured. do.

In order to achieve the above object, according to an aspect of the present invention, as an apparatus for measuring the shape of the measurement object placed in the work area in which at least three first positioning means for transmitting or receiving a position signal distributed A main frame, at least three second positioning means distributed in the main frame and receiving or transmitting a position signal, a laser distance measuring sensor coupled to the main frame and measuring a distance to an object under test; There is provided a non-contact shape measuring device including a support portion for supporting the, a tilting portion is installed between the main frame and the support portion and coupled to the main frame by a first rotation shaft, the support portion is coupled by a second rotation shaft.

Here, the first positioning means is a transmitter for transmitting the synchronized radio waves as a position signal, the second positioning means is a receiver for receiving the synchronized radio waves respectively, and the synchronized radio waves are received by the second positioning means The time difference can be measured to calculate the position of the second positioning means within the work area.

Alternatively, the second positioning means is a light emitting body for transmitting an optical signal as a position signal, the first positioning means is a camera for detecting the optical signal, the work area by comparing the position where the optical signal is detected by the first positioning means It is possible to calculate the position of the second positioning means within.

In the non-contact shape measuring apparatus as described above, the second positioning means may be disposed on one plane perpendicular to the direction in which the laser distance measuring sensor irradiates the laser beam. In addition, the first rotating shaft and the second rotating shaft of the tilting part may be parallel to one plane on which the second positioning means is disposed.

The support unit may include a support frame connected to the main frame, and a support coupled to the support frame and supporting the support frame with height adjustment with respect to the bottom surface of the work area.

The present invention makes it possible to easily calculate the spatial coordinates in the working area of the non-contact shape measuring device, so that even if the position of the non-contact shape measuring device is changed in the process of measuring the shape of the object to be measured, Since the initialization operation for setting the position may not be performed again, the shape of the object to be measured can be easily measured, and the time required for the measurement can be saved.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all transformations, equivalents, and substitutes included in the spirit and scope of the present invention. In the following description of the present invention, if it is determined that the detailed description of the related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted.

In addition, the expression 'vertical' or 'parallel' and 'parallel' used in describing the present invention does not mean mathematical or geometric 'vertical', 'parallel' and 'parallel', but a machining error. (B) actual 'vertical', 'parallel' and 'parallel' in consideration of transport errors.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a front view of a non-contact shape measuring apparatus according to an embodiment of the present invention.

Referring to FIG. 1, a non-contact shape measuring apparatus 100 according to an embodiment of the present invention includes a main frame 110, a first vector bar 120, a second vector bar 130, and a laser distance measuring sensor 140. ), The tilting part 150 and the support part 160 are included.

The main frame 110 is provided with a first vector bar 120, a second vector bar 130, and a laser distance measuring sensor 140. The first vector bar 120 and the second vector bar 130 are spaced apart from each other in a direction parallel to the main frame 110, the laser distance measuring sensor 140 is a bracket 111 coupled to the main frame 110 It is coupled to the main frame 110 by.

Although not shown, second positioning means are provided at the upper and lower ends of the first vector bar 120 and the upper and lower ends of the second vector bar 130, respectively. That is, the plurality of second positioning means installed on the first vector bar 120 and the second vector bar 130 are disposed on the main frame 110, where the plurality of second positioning means are located on one plane. Is placed.

As described above, the laser distance measuring sensor 140 and the plurality of second positioning means are integrated into the main frame 110. The second positioning means will be described below with reference to FIG. 2.

One side of the laser distance measuring sensor 140 is formed with a laser irradiation unit 141 for emitting a laser beam, a laser receiving unit (not shown) for receiving the reflected laser beam is formed. Here, the laser irradiation unit 141 is configured to irradiate the laser beam in a direction perpendicular to one plane formed by the plurality of second positioning means.

The tilting part 150 includes a tilting frame 151, a first rotating shaft 152, a first rotating means 153, a second rotating shaft 154, and a second rotating means 155. The support unit 160 coupled to the tilting unit 150 includes a support frame 161 and a support 162.

The tilting frame 151 has two plane portions perpendicular to each other. The first rotating shaft 152 penetrates and is coupled to one of the two planar portions of the tilting frame 151, and one end of the first rotating shaft 152 is coupled to the main frame 110 and the first rotating shaft 153. At the other end of the first rotation means 153 is coupled.

The second rotating shaft 154 penetrates and is coupled to the other one of the two planar portions of the tilting frame 151, one end of the second rotating shaft 154 is coupled to the support frame 161, and the second rotating shaft ( The other end of the 154 is coupled to the support frame 161.

Therefore, the main frame 110 is rotatably coupled to the support frame 161 using the first rotation shaft 152 and the second rotation shaft 154 as the rotation center axis.

Here, the center axis of the first axis of rotation 152 and the center axis of the second axis of rotation 154 are disposed to be perpendicular to each other, the center axis of the first axis of rotation 152 and the center axis of the second axis of rotation 154 is a plurality of The second positioning means is arranged in parallel with one plane formed.

The support frame 162 is coupled to the support frame 161. Support 162 is configured to adjust the height of the support frame 161 with respect to the bottom surface of the work area not shown.

2 illustrates an example of measuring a shape of a block by using a non-contact shape measuring apparatus according to an exemplary embodiment of the present invention.

Referring to FIG. 2, the shape of the block 1 as the object to be measured is measured by using the non-contact shape measuring apparatus 100 according to an exemplary embodiment of the present invention.

A plurality of first positioning means 11, 12, 13 for transmitting a position signal are distributed in the work area, ie the work place, on which the block 1 is placed. The plurality of first positioning means 11, 12, 13 wirelessly transmits the radio waves synchronized in the work area. The plurality of second positioning means built in the first vector bar 120 and the second vector bar 130 may receive the position signals transmitted by the plurality of first positioning means 11, 12, 13. The distance from each of the received position signals is measured to measure a distance from each of the plurality of first positioning means (11, 12, 13), and the triangulation method is used to determine the plurality of first positioning means (11, 12, 13 relative position.

Accordingly, the position of each of the plurality of second positioning means installed on the first vector bar 120 and the second vector bar 130, that is, the second positioning means distributed in one plane on the main frame 110 and distributedly disposed. Once all of these are identified, the non-contact shape measuring apparatus 100 can determine which position in the work area.

In addition, the position where the plurality of second positioning means are installed in the main frame 110 may be known in advance, and the relative positions of the plurality of second positioning means and the laser irradiator 141 may also be known in advance. Therefore, if the position of each of the plurality of second positioning means is grasped, the position in the working area of the laser irradiator 141 and the direction in which the laser beam is irradiated can be known.

Therefore, by attaching a target paper (not shown) to the main part of the block 1 to be measured and measuring the distance to each target paper by the laser distance measuring sensor 140, the position of the target paper in the working area can be easily coordinated. Can be mad.

For reference, at least three first positioning means (11, 12, 13) is required to grasp the position in the working area by triangulation using the second positioning means, the work of the laser irradiation unit 141 At least three second positioning means are required to determine not only the position in the area but also the angle at which the laser beam is irradiated. And, if necessary, the number of the first positioning means (11, 12, 13) and the second positioning means can be added.

As described above, in the non-contact shape measuring apparatus 100 according to the exemplary embodiment of the present invention, the position within the work area in which the plurality of first positioning means 11, 12, 13 are arranged in a dispersed manner is easily understood. Since the position of the laser irradiator 141 and the angle of the laser beam to be emitted are also easily calculated, the spatial coordinates of the target site are also easily calculated.

Accordingly, the position of the target paper attached to one side of the block 1 is measured, and then the position of the target paper attached to the other side of the block 1 is measured, or the protruding portion of the shell plate 2 like the top seam 3 is measured. Even when the part covers the laser irradiation part 141 and the target paper to change the position of the non-contact shape measuring device 100, the position and attitude of the non-contact shape measuring device 100, that is, the coordinates in space of the laser irradiation part 141, and There is no need to initialize the angle at which the laser beam is emitted.

For reference, although not illustrated, a plurality of second positioning means installed in the vector bars 120 and 130 may be used as the first positioning means distributed in the work area using a plurality of cameras for detecting an optical signal. As the light emitting body for transmitting the optical signal can be used. That is, the position of each of the plurality of second positioning means can be grasped by comparing the positions of the light emitters photographed by the plurality of cameras. I can figure it out.

Although the non-contact shape measuring apparatus according to the embodiment of the present invention has been described above, the spirit of the present invention is not limited to the embodiments presented herein, and those skilled in the art to understand the spirit of the present invention are within the scope of the same idea. Other embodiments may be easily proposed by adding, changing, deleting, or adding components, but this will also fall within the spirit of the present invention.

1 is a front view of a non-contact shape measuring apparatus according to an embodiment of the present invention.

2 is a view showing an example of use of the non-contact shape measuring apparatus according to an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

100: non-contact shape measuring device 110: main frame

120: first vector bar 130: second vector bar

140: laser distance measuring sensor 150: tilting unit

160: support

Claims (6)

An apparatus for measuring the shape of a measurement object placed in a work area in which at least three first positioning means for transmitting or receiving a position signal are distributedly arranged, Mainframe; At least three second positioning means distributed in the main frame and receiving or transmitting the position signal; A laser distance measuring sensor coupled to the main frame and measuring a distance to the object to be measured; Support for supporting the main frame; And The non-contact shape measuring device is installed between the main frame and the support portion, the main frame is coupled to the first rotation axis, and the support portion comprises a tilting unit coupled by a second rotation axis. The method of claim 1, The first positioning means is a transmitter for transmitting a synchronized radio wave as the position signal, The second positioning means is a receiver for receiving each of the synchronized radio waves, And measuring the time difference at which the synchronized radio wave is received by the second positioning means to calculate the position of the second positioning means within the work area. The method of claim 1, The second positioning means is a light emitting unit which transmits an optical signal as the position signal, The first positioning means is a camera for detecting the optical signal, And a position of the second positioning means within the working area by comparing the position at which the optical signal is sensed by the first positioning means. The method according to claim 2 or 3, And the second positioning means is disposed on one plane perpendicular to the direction in which the laser distance measuring sensor irradiates the laser beam. 5. The method of claim 4, And a first rotating shaft and the second rotating shaft of the tilting part are parallel to the one plane on which the second positioning means is disposed. The method of claim 5, The support portion A support frame connected to the main frame; And And a supporter coupled to the support frame, the support frame supporting the support frame such that the support frame is adjustable in height with respect to the bottom surface of the work area.

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