KR101556260B1 - Apparatus and method for testing cleaning performance for piece - Google Patents

Abstract

A specimen cleaning performance test apparatus and method thereof are disclosed. A test piece cleaning performance test apparatus according to an embodiment of the present invention includes: a water tank provided with a specimen inside; A cleaning device for performing a cleaning operation on a cleaning area of the specimen using a rotary brush while the water tank is filled with water; And a guide frame provided at the peripheral portion of the water tank and guiding the cleaning device.

Description

TECHNICAL FIELD [0001] The present invention relates to a device for testing cleaning performance,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to an apparatus and a method for testing a sample cleaning performance.

The outer surface of the hull of the ship is clogged with various foreign substances such as barnacles, water moss, etc., which may hurt the appearance or obstruct the efficient operation of the ship. However, when the operator carries out the cleaning of the outer wall of the hull using water or bare hands, it is very inefficient, and it is difficult to ensure the reliability of the cleaning work and the safety of the worker. Recently, various types of cleaning robots have been used.

For example, Korean Unexamined Patent Publication No. 2012-0056354 (published on June 4, 2012) and Korean Unexamined Patent Publication No. 2011-0062248 (Unexamined Published Jun. 10, 2011) disclose technologies concerning a cleaning robot for removing foreign matter. In addition to these prior arts, various conventional cleaning robots typically use a rotary brush to clean the foreign object while traveling on the outer wall of the hull. At this time, the cleaning brush is cleaned while rubbing against the outer wall of the hull.

However, in this process, the cleaning performance may be influenced by the material, thickness, rotation speed, cleaning height, etc. of the brush. If the cleaning performance is poor, a large amount of foreign matter such as a barnacle It can remain.

Therefore, it is necessary to conduct a test operation on a test piece (piece) of the same or similar material as the outer wall of the hull by using the brush used in the cleaning robot in advance, and to perform a test on the cleaning performance and the like.

Korea Patent Publication No. 2012-0056354 (2012.06.04 published) Korean Patent Publication No. 2011-0062248 (Published on Jun. 10, 2011)

An embodiment of the present invention is to provide a test piece cleaning performance test apparatus and method which can easily and effectively measure a cleaning performance or the like by performing a cleaning operation using a brush on a test piece placed in a water filled water tank.

According to an aspect of the present invention, there is provided a water treatment apparatus comprising: a water tank provided with a specimen therein; A cleaning device for performing a cleaning operation on a cleaning area of the specimen using a rotary brush while the water tank is filled with water; And a guide frame provided at a peripheral portion of the water tank to guide the cleaning device.

The apparatus may further include a receiving plate installed in the water tub and capable of adjusting the height of the specimen.

A magnet block attached to the bottom surface of the water tank and having a magnetism at the time of electric power supply, the magnet block supporting the bottom plate; and a magnet block attached to the lower plate and the magnet block, And a height adjusting mechanism including a screw shaft passing through the upper plate and the lower plate so that a lower portion of the screw shaft is rotatably inserted into the shaft support and a rotary knob connected to the lower knob, The upper plate coupled to the screw shaft can be moved up and down.

The cleaning device includes a support plate movably coupled to a guide rail formed on the guide frame, a motor device for rotating the brush, a case for accommodating the motor device, and a guide member coupled to the guide groove of the support plate, And a lifting unit for moving the case in the longitudinal direction of the support plate to move the brush in the vertical direction.

The guide frame may be arranged in a 'C' shape on the peripheral portion of the water tank in a state where the water tank is disposed at the center, and may be provided in a multi-stage block-shaped frame skeleton structure.

Wherein the guide frame includes a first frame for horizontally moving the cleaning device, a second frame disposed at right angles to both sides of the first frame, and a second frame for vertical movement of the cleaning device, Is rotatably coupled to both sides of the first frame so that the cleaning device can move between the first frame and the second frame via the guide rails in a state in which the first frame and the second frame are laid flat .

The cleaning performance measuring unit may further include an image receiving unit for receiving an image before and after the cleaning operation for the cleaning area of the specimen from the image pickup apparatus, A block dividing unit for extracting a first image and a second image before and after the cleaning operation from the image and dividing the first and second images into a plurality of blocks; And a calculation unit for calculating the number of blocks of the image, and the cleaning performance of the cleaning apparatus can be measured based on the difference value of the calculated number of blocks.

The apparatus may further include a film damage inspection device for measuring a change amount of the film thickness to the cleaning area of the specimen before and after the cleaning operation to measure a damage degree of the coating film of the specimen.

According to another aspect of the present invention, there is provided a washing machine comprising: a water tank provided with a specimen inside; a cleaning device that performs a cleaning operation on a cleaning area of the specimen using a rotary brush while the water tank is filled with water; A method for testing a test piece cleaning performance using a test piece cleaning performance test apparatus comprising a guide frame for guiding the cleaning device, and a support plate installed in the water tub and having the specimen mounted thereon and being adjustable in height, Installing the specimen at an inclined angle inside the water tank; And (b) a cleaning operation for the cleaning area of the specimen is performed while moving the cleaning apparatus while keeping the height of the brush constant from a position where the inclination angle of the specimen is small to a position where the inclination angle is large A method for testing a sample cleaning performance may be provided.

The step (a) may be performed by adjusting the height of the support plate by rotating a rotary knob of a height adjusting device coupled to the support plate by a screw shaft, the support plate being provided symmetrically with a peripheral edge of the support plate.

The test piece cleaning performance test apparatus and method according to the embodiment of the present invention can perform a cleaning operation using a brush on a specimen placed in a water filled water tank to easily and effectively measure the cleaning performance.

In addition, by performing the cleaning operation while the specimen is installed at an inclined angle and the height of the brush is kept constant, various distances between the specimen and the brush, cleaning performance in the contact state, and damage inspection of the coating film can be performed .

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the claims.

1 is a perspective view of a test piece cleaning performance test apparatus according to an embodiment of the present invention.
2 is a cross- Fig. 1 is a block diagram of components included in the test apparatus shown in Fig. 1 for performing a cleaning performance and a coating damage inspection based on a result of performing a sample cleaning operation.
FIG. 3 is a perspective view showing a support plate installed inside the water tank of the test apparatus shown in FIG. 1 and a specimen placed thereon.
FIG. 4 is an enlarged view of a portion of a base plate for adjusting the height of the specimen shown in FIG.
FIG. 5 is a perspective view of the guide frame of the test apparatus shown in FIG. 1 unfolded.
FIG. 6 is a diagram showing a block image of a predetermined cleaning area before and after a cleaning operation, in order to calculate the number of blocks in which foreign matter exists, using the cleaning performance measuring part of the components shown in FIG. Lt; / RTI >
7 is an exemplary diagram for explaining a method for calculating the number of blocks in which foreign matter exists among blocks of the image image shown in FIG.
FIG. 8 is a cross-sectional view showing an example of a method of performing a cleaning operation on a specimen using the test apparatus shown in FIG. 1. FIG.
FIG. 9 is a plan view showing a shape in which the specimen shown in FIG. 8 is divided into a plurality of cleaning regions.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments described below are provided by way of example so that those skilled in the art will be able to fully understand the spirit of the present invention. The present invention is not limited to the embodiments described below, but may be embodied in other forms. In order to clearly explain the present invention, parts not related to the description are omitted from the drawings, and the width, length, thickness, etc. of the components may be exaggerated for convenience. Like reference numerals designate like elements throughout the specification.

1 and 2, a test piece cleaning performance testing apparatus 100 according to an exemplary embodiment of the present invention includes a water tub 110, a base plate 120, a cleaning device 130, a guide frame 140, 150, a cleaning performance measuring unit 160, and a coating damage inspection apparatus 170. For convenience of explanation, the support plate 120 and the test piece 10 disposed inside the water tub 110 are not shown in FIG. 1, and this is shown in FIG.

As shown in FIG. 1, the water tub 110 may be formed in a rectangular shape, for example, and may be made movable by a wheel 112 provided at a corner portion. The water tank 110 is provided with a pipe 114 which is opened and closed by a valve 113 on one side so that water can be filled in or removed from the inside.

Referring to FIGS. 3 and 4, the support plate 120 is installed in the water tub 110, and the test piece 10 is mounted on the upper portion thereof. The support plate 120 has a top plate 121 on which the test piece 10 is fixed and a bottom plate 122 disposed on the bottom of the top plate 121. The bottom plate 122 is attached to the bottom surface of the water tray 110, A shaft support 124 disposed between the lower plate 122 and the magnet block 123 and a lower support 122 which penetrates the upper plate 121 and the lower plate 122 to support the lower shaft support 123. [ And a height adjustment device 127 including a screw shaft 125 that is rotatably interposed in the housing 124 and a rotary knob 126 connected thereto. The height adjustment device 127 may be installed symmetrically with a peripheral edge portion of the support plate 120. At this time, the upper plate 121 coupled with the screw shaft 125 is lifted and lowered according to the rotation direction of the rotary knob 126, so that the height of the specimen 10 fixed to the upper plate 121 is adjusted. The test piece 10 may be fixed to the upper plate 121 by a fastening member 12 such as a bolt. The test piece 10 may include, for example, a piece of outer shell plate and the like.

1, the cleaning device 130 includes a support platter 132, a motor device 134, a case 136, and a lift portion 138. As shown in FIG.

The support platter 132 is detachably and movably coupled to the guide rail R formed on the guide frame 140. The support platter 132 may have a coupling portion 132a movably coupled to the guide rail R formed on the guide frame 140 at upper and lower portions thereof. Although not shown, a wheel driven by a motor on the guide rail R may be mounted on the engaging portion 132a.

The motor device 134 rotates the brush 20. To this end, the motor device 134 receives electricity through the cable 2 and rotates the rotary shaft 22 connected to the rotary plate 25 of the brush 20 to which the cleaning cloth 21 is attached. The cable 2 may be installed inside the cable bail 4 for the purpose of preventing aesthetic and twisting, and may be a power cable connected to a power supply device (not shown) to supply power necessary for driving the motor device 134, A communication cable for communication, and the like.

The case 136 may be provided in a form of engaging with the motor device 134. This improves convenience in installation and allows the case 136 to be raised and lowered naturally through the lifting portion 138, So as to be vertically adjustable.

The lifting portion 138 is engaged with the guide groove H of the support platter 132 and moves the case 136 in the longitudinal direction of the support platter 132 so that the brush 20 moves up and down (Z- . The elevating portion 138 can move the case 136 using hydraulic pressure, mechanical means, electric means (motor) or the like.

5, the guide frame 140 includes a first frame 141 for horizontally moving the cleaning device 130, a cleaning device 130 disposed at right angles to both sides of the first frame 141, And a second frame 142 for vertical movement of the second frame 142. The guide frame 140 may be arranged in a 'C' shape on the periphery of the water tub 110 in a state where the water tub 110 is disposed at the center.

The first frame 141 and the second frame 142 may be provided in a multi-stage block-like frame structure. The second frame 142 is rotatably coupled to both sides of the first frame 141 by the tiltable member 144 so that the first frame 141 and the second frame 142 are cleaned The apparatus 130 can be moved between the first frame 141 and the second frame 142 via the guide rails R of the first frame 141 and the second frame 142. [ The tiltable member 144 may include, for example, a hinge or a hinge, and various other conventional means may be used. 5, when the support frame 132 is moved from the first frame 141 to the second frame 142 in a state in which the first frame 141 and the second frame 142 are flatly spread Then, as shown in FIG. 1, the second frame 142 on both sides of the first frame 141 may be rotated and arranged in a " C " shape to perform a cleaning operation or the like. This can also be applied when the support frame 132 is moved from the second frame 142 to the first frame 141.

Referring to FIG. 2, the photographing apparatus 150 photographs an image of a cleaning area of the specimen 10 before and after the cleaning operation. The photographing apparatus 150 can perform photographing in a state where the photographing apparatus 150 is installed in the above-described cleaning apparatus 130. For example, in a state in which the water tank 110 is not filled with water before and after the cleaning operation, the photographing apparatus 150 may be attached to the support platter 132 to photograph the cleaning region of the specimen 10. The photographing apparatus 150 includes photographing means such as a camera and may be detachably attached to the support platter 132 by various conventional fixing means in a state in which the function of zooming is set. For effective shooting before and after the cleaning operation, shooting may be done with an additional dark box installed.

2, 6, and 7, the cleaning performance measuring unit 160 includes an image receiving unit 162 for receiving an image before and after the cleaning operation for the cleaning area of the test piece 10 from the image capturing apparatus 150, A block dividing unit for extracting a first image image (i-1) before the cleaning operation from the received image and a second image image (i-2) after the cleaning operation by the plurality of blocks (B) (166) for calculating the number of blocks (B) of the first image image (i-1) and the number of blocks (B) of the second image image (i-2) , And the cleaning performance of the cleaning device 130 is measured based on the difference value of the number of the calculated blocks (B). The cleaning performance measuring unit 160 may be installed in a module form in a test server (not shown) that performs wired / wireless communication with the photographing apparatus 150 and the film damage inspection apparatus 170.

The block dividing section 164 may divide the first image image i-1 and the second image image i-2 into a plurality of blocks B so as to have a rectangular shape of the same size. Here, the block B may be an area partitioned by an imaginary line that is not actually displayed visually.

The calculation unit 166 calculates the number of blocks B in which the foreign substance 31 is present among the blocks B of the first and second image images (i-1, i-2).

For example, referring to FIG. 6A, the first and second image images (i-1, i-2) are divided into 10 blocks (B) horizontally and vertically by block dividing section 164, . At this time, the number of blocks B of the first image image (i-1) in which the foreign substance 31 exists before the cleaning operation for the cleaning area of the test piece 10 can be calculated by the calculation unit 166. [ For the sake of understanding, it is assumed that the number of blocks B of the first image image (i-1) in which the foreign substance 31 exists before the cleaning operation for the cleaning area of the test piece 10 is 70 pieces.

6B, the number of blocks B of the second image image (i-2) in which the foreign matter 31 exists after the cleaning operation for the cleaning area of the test piece 10 is performed is calculated (166). ≪ / RTI > Here, it is assumed that the number of blocks B of the second image image (i-2) in which the foreign substance 31 exists after cleaning the cleaning area of the test piece 10 is 30 pieces.

6A and 6B, the number of the blocks B in which the foreign matter 31 exists after the cleaning operation is reduced to less than half of that before the cleaning operation in the cleaning area of the specimen 10 is performed .

As described above, the calculation unit 166 calculates the number of the blocks B in which the foreign substance 31 exists among the blocks B of the first and second image images (i-1, i-2) When the ratio of at least one of the size and the amount of the foreign matter 31 occupying in one block B exceeds a predetermined value, the block B is included in the number of the blocks B in which the foreign substance 31 exists .

That is, when the foreign matter 31 exists in the first block B1 to the fourth block B4 in FIG. 7A, the size ratio of the foreign matter 31 occupying in the first block B1 is Exceeds the reference value (50%) of one block (B1). In this case, the calculation unit 166 includes the first block B1 in the number of blocks B in which the foreign matter 31 exists. However, in the case of the second block B2 to the fourth block B4, the size ratio of the foreign matter 31 in each of the blocks B2 to B4 exceeds the reference value (50%) of each of the blocks B2 to B4 The calculation unit 166 does not include the corresponding blocks B2 to B4 in the number of blocks B in which the foreign substance 31 is present.

As another example, the ratio of the amount of foreign matter 31 in the fifth block B5 in FIG. 7B exceeds the reference value 50% in the fifth block B5. In this case, the calculation unit 166 includes the fifth block B5 in the number of blocks B in which the foreign matter 31 exists. However, in the case of the sixth to sixth blocks B6 to B8, since the ratio of the amounts of the foreign substances 31 in each of the blocks B6 to B8 does not reach the reference value (50%), Does not include the corresponding blocks B6 to B8 in the number of blocks B in which the foreign substance 31 exists. The reference value for processing with the block B in which the foreign matter 31 is present may be changed to various values. 7, only a part of the entire block B of the image image is shown for the sake of understanding.

The calculating unit 166 may include a foreign substance identifying unit 165. The foreign substance identifying unit 165 identifies the foreign substance 31 using at least one of brightness, hue and saturation of the first and second image images (i-1, i-2). For example, since the specimen 10 is painted with a specific color, the distinction from the foreign matter 31 can be clear.

At this time, the foreign substance identification unit 165 can extract the edge (E, see FIG. 7A) of the foreign substance 31 and obtain the outline information of the foreign substance 31. [ The foreign substance identification unit 165 identifies at least a part of the foreign matter 31 among the blocks B of the first and second image images i-1 and i-2 on the basis of the obtained contour information of the foreign substance 31 The block B containing the foreign matter 31 can be classified into the block B existing the foreign matter 31. [ As another example, if the ratio of the size and the amount of the foreign matter 31 occupying one block B exceeds a preset value, the foreign substance identifying unit 165 may determine that the foreign matter 31 Can be classified into an existing block (B).

As described above, the cleaning performance measuring unit 160 measures the difference between the number of blocks B of the first image image i-1 and the number of the blocks B of the second image image i-2 in which the foreign substance 31 exists The cleaning performance of the cleaning device 130 can be measured. 6, when the number of blocks B of the first image image (i-1) in which the foreign substance 31 is present is 70 before the cleaning operation is performed and the foreign matter 31 Assuming that the number of blocks B of the existing second image image i-2 is 30, the number of blocks B in which the foreign substance 31 is removed after the cleaning operation is performed is 40 before the cleaning operation is performed . Accordingly, when the criterion for determining the goodness of cleaning performance is 60, the cleaning performance of the cleaning apparatus 130 may be determined to be defective. The criterion for judging the cleaning performance may be preset to a different value.

Referring to FIG. 2, the film damage inspection apparatus 170 measures the amount of change in the coating film thickness with respect to the cleaning area of the sample 10 before and after the cleaning operation, and measures the damage degree of the coating film of the sample 10. The film damage inspection apparatus 170 can measure the change amount of the coating film thickness before and after the cleaning operation using, for example, ultrasonic waves. The film damage inspection apparatus 170 may be attached to the cleaning apparatus 130 before and after the cleaning operation in the same manner as the topography apparatus 150 to measure the change amount of the film thickness to the cleaning area of the sample 10 before and after the cleaning operation have. Each of the components shown in FIG. 2 may be composed of a kind of 'module'. The term 'module' refers to a hardware component such as software or a field programmable gate array (FPGA) or application specific integrated circuit (ASIC), and the module performs certain roles. However, a module is not limited to software or hardware. A module may be configured to reside on an addressable storage medium and may be configured to execute one or more processors. The functionality provided by the components and modules may be combined into a smaller number of components and modules or further separated into additional components and modules.

Hereinafter, a cleaning performance test method will be described with reference to FIGS. 8 and 9 based on the contents of FIGS. 1 to 7. FIG. In Fig. 8, only the parts required for explanation are shown.

Referring to FIGS. 8 and 9, the specimen 10 is installed at an inclined angle inside the water tub 110 for cleaning performance test. The height of the support plate 120 can be adjusted by rotating the rotary knob 126 of the height adjusting device 127 as described above in order to install the test piece 10 at an inclined angle inside the water tub 110. [ At this time, before or after adjusting the height of the support plate 120, it is possible to take images of the cleaning areas R1 to R5 of the specimen 10 before the cleaning operation using the above-described photographing apparatus 150. [ The test piece 10 may be formed of a flat portion 10a and a curved portion 10b and the flat portion 10a may be divided into a plurality of cleaning regions R1 to R5.

Next, water is filled to the extent that the specimen 10 is locked inside the water tub 110, and the cleaning operation for the cleaning area of the specimen 10 is performed. At this time, the cleaning device 130 is moved while maintaining the height of the brush 20 at a position where the inclination angle of the specimen 10 is small, (R1 to R5) can be performed. Since the specimen 10 is installed at an inclined angle, the cleaning device 130 is moved while the height of the brush 20 is kept constant, and the cleaning area R1 to R5 of the specimen 10 is cleaned When the work is performed, the length of the cleaning hair 21 contacting the cleaning areas R1 to R5 and the like can be changed, and the degree of scratch damage and cleaning performance of various stand-offs can be analyzed by one experiment. The cleaning operation may proceed in the order of the flat portion 10a and the curved portion 10b of the test piece 10.

Next, the cleaning performance measuring unit 160 extracts the first image image (i-1) and the second image image (i-2) from the respective images captured before and after the cleaning operation, Respectively.

The cleaning performance measuring unit 160 calculates the block number of the first image image i-1 and the block number of the second image image i-2 in which the foreign substance exists, The cleaning performance of the cleaning device 130 is measured.

On the other hand, instead of the cleaning performance described above, the amount of change in the coating film thickness with respect to the cleaning area of the test piece 10 before and after the cleaning operation is measured through the coating film damage inspection apparatus 170, and the degree of damage of the coating film of the test piece 10 is measured It is possible.

The above test method may be repeated several times while changing the type of the brush 20, the rotating speed, the cleaning height, the material and thickness of the cleaning hair 21, the inclination angle of the test piece 10, and the like.

The foregoing has shown and described specific embodiments. However, it is to be understood that the present invention is not limited to the above-described embodiment, and various changes and modifications may be made without departing from the scope of the technical idea of the present invention described in the following claims It will be possible.

100: specimen cleaning performance test apparatus, 110: water tank,
120: base plate, 130: cleaning device,
140: guide frame, 150: photographing apparatus,
160: Cleaning performance measuring unit, 162: Image receiving unit,
164: block dividing section, 166: calculating section,
170: Film damage inspection device.

Claims (10)

A water tank provided with a specimen inside;
A cleaning device for performing a cleaning operation on a cleaning area of the specimen using a rotary brush while the water tank is filled with water;
A guide frame provided at a periphery of the water tank and guiding the cleaning device; And
And a support plate installed in the water tub and having the specimen mounted thereon and having a height adjustable,
The base plate
An upper plate on which the specimen is fixed,
A lower plate disposed below the upper plate,
A magnet block attached to the bottom surface of the water tank with magnetism during electric power supply and supporting the bottom plate,
A shaft support disposed between the lower plate and the magnet block,
And a height adjuster including a screw shaft passing through the upper plate and the lower plate and the lower portion being rotatably inserted into the shaft support, and a rotary knob connected to the screw shaft,
And the upper plate coupled to the screw shaft is moved up and down according to the rotation direction of the rotary knob. delete delete A water tank provided with a specimen inside;
A cleaning device for performing a cleaning operation on a cleaning area of the specimen using a rotary brush while the water tank is filled with water; And
And a guide frame provided at a peripheral portion of the water tank and guiding the cleaning device,
The cleaning device
A support plate movably coupled to a guide rail formed on the guide frame,
A motor device for rotating the brush,
A case for accommodating the motor device,
And a lifting unit coupled to the guide groove of the support plate and moving the case in the longitudinal direction of the support plate to move the brush in the up and down direction. The method according to claim 1 or 4,
Wherein the guide frame is arranged in a 'C' shape on the peripheral portion of the water tank in a state where the water tank is disposed at the center, and is provided with a multi-stage block-shaped frame skeleton structure. 5. The method of claim 4,
The guide frame
A first frame for horizontal movement of the cleaning device,
And a second frame disposed at right angles to both sides of the first frame for vertical movement of the cleaning device,
Wherein the second frame is rotatably coupled to both sides of the first frame such that the cleaning device is moved in the first frame and the second frame through the guide rail, A sample cleaning performance test device that allows to move between. The method according to claim 1 or 4,
And a cleaning performance measuring unit for measuring a cleaning performance of the cleaning apparatus,
The cleaning performance measuring unit
An image receiving unit for receiving an image before and after the cleaning operation for the cleaning area of the specimen from the image pickup apparatus,
A block dividing unit for extracting a first image and a second image before and after the cleaning operation from the received image and dividing the extracted first and second images into a plurality of blocks;
And a calculation unit for calculating the number of blocks of the first image and the number of blocks of the second image,
And measures a cleaning performance of the cleaning device based on a difference value of the calculated number of blocks. The method according to claim 1 or 4,
Further comprising a film damage inspection device for measuring a degree of damage of a coating film of the specimen by measuring a change amount value of a coating film thickness to a cleaning area of the specimen before and after the cleaning operation. A cleaning device for performing a cleaning operation on the cleaning area of the specimen by using a rotary brush in a state where water is filled in the water tank; A method for testing a test piece cleaning performance using a test piece cleaning performance test apparatus including a guide frame and a support plate installed in the water tub and having the test specimen mounted thereon and being adjustable in height,
(a) installing the specimen at an inclined angle inside the water tank; And
(b) a cleaning operation for the cleaning area of the specimen is performed while moving the cleaning apparatus while keeping the height of the brush constant from a position where the inclination angle of the specimen is small to a position where the inclination angle is large The method comprising the steps of: 10. The method of claim 9,
The method of claim 1, wherein the step (a) comprises the steps of: rotating the rotary knob of the elevation adjustment device coupled to the support plate by a screw shaft to adjust the height of the support plate, Test method.

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