KR101703182B1 - Testing apparatus for adhesive power of film of paint - Google Patents

Abstract

An apparatus for testing the adhesion of a paint film is disclosed.
According to an embodiment of the present invention, a coating film test piece having a coating film formed thereon; A dolly attached to the coating film and projecting onto the coating film test piece; A pulling grip portion coupled to the tensile force providing means at one end and coupled to the dolly at the other end to transmit tensile force to the dolly; And a test bed portion disposed below the pulling grip portion and gripping the coated film test piece so that the dolly protrudes toward the pulling grip portion.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a testing apparatus,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus for testing an adhesion force of a coating film, and more particularly, to an apparatus for testing an adhesion force of a coating film capable of measuring a pressure at which the coating film breaks down under cryogenic conditions.

Generally, ships are mostly steel wires whose hull is made of steel. These steel wires have good durability, can be enlarged, and have excellent performance. However, the biggest disadvantage of the steel wire is the corrosion of the hull.

The most basic method to prevent the corrosion of the hull is to apply paint to the outer shell of the hull in order to prevent contact with air and moisture. This hull painting method is a method of applying high quality epoxy and corrosion- It is common to paint.

However, since the initial adhesion force of the coating film is weak or the coating film is separated from the hull due to deterioration of adhesion with time, the hull may be corroded, so that the adhesion test of the coating film can be performed after the completion of the coating process.

Conventional paint film adhesion test can be performed by adhering Dolly to the paint film surface with an adhesive and then pulling the dolly up with a tester to measure the pressure when the paint film is broken.

Conventional paint film adhesion tests are mainly performed by a hydraulic or pneumatic tester. The hydraulic or pneumatic tester can be used directly in the laboratory or in the field, but there is a problem that the test is difficult for the following reasons at a cryogenic temperature (for example, -170 ° C).

Hydraulic oil used in a hydraulic testing machine has a viscosity of about -40 ° C at a pour point of about 40 ° C or less, which results in loss of fluidity and coagulation. Therefore, the hydraulic oil can not be used at a cryogenic temperature and its performance may deteriorate.

Also, pneumatic tester uses air hose to provide pneumatic pressure, because it is made of synthetic resin, there is a risk of being damaged by impact at cryogenic temperature.

Since the conventional hydraulic or pneumatic tester can not be used under the cryogenic conditions, there is a problem that it is difficult to test the adhesion of the coating film applied to the LNG carrier in a cryogenic environment.

Korean Patent Laid-Open No. 10-2007-105703 (October 31, 2007)

An embodiment of the present invention is to provide an apparatus for testing the adhesion of a coating film which can always evaluate the adhesion force of the coating film accurately without any change in performance depending on the temperature.

Also, it is intended to provide a coating strength test apparatus capable of accurately evaluating the adhesion force of a coating film applied to a ship operating in a cryogenic environment, such as an LNG carrier, under the same conditions as in a cryogenic environment.

According to an aspect of the present invention, there is provided a coated film test piece having a coating film formed thereon; A dolly attached to the coating film and projecting onto the coating film test piece; A pulling grip portion coupled to the tensile force providing means at one end and coupled to the dolly at the other end to transmit tensile force to the dolly; And a test bed portion disposed at a lower portion of the pulling grip portion and gripping the coated film test piece so that the dolly protrudes toward the pulling grip portion.

The pulling grip portion may include: a rod portion detachably coupled to the tensile force providing means; A cylinder portion coupled to the rod portion; A piston portion protruding from the cylinder portion toward the dolly; And a coupling portion having one end coupled to the piston portion and the other end coupled to the dolly.

Here, the cylinder portion may be screwed with at least one of the rod portion and the piston portion to adjust the distance from the dolly.

Further, the rod portion may be coupled to the tensile force providing means via an engaging pin.

Also, the test bed portion may include a base portion having a latch portion to which the coating film test piece is caught and an opening portion in which the latch portion is partially exposed to expose the dolly; And a grip unit which is installed on the base part so as to be able to move up and down, and which holds and holds the coating film test piece.

The gripping unit may include: a stationary shaft fixed to a lower portion of the base; A movable shaft screwed to the stationary shaft and capable of expanding in the height direction; A handle coupled to a circumference of the moving shaft to rotate the moving shaft; And a support member coupled to an upper end of the moving shaft and on which the coating film test piece is seated.

The pulling grip portion may have a pin hole formed at one end thereof so as to be coupled with the tensile force providing means, and a latching groove may be formed at the other end to engage with the dolly.

Further, the apparatus may further include a temperature control chamber 500 for enclosing the test bed part, sealing the test bed part, and maintaining the inside of the test bed part at a predetermined temperature so that the test piece can be tested at predetermined temperature conditions.

According to the embodiment of the present invention, since the adhesion force of the paint film can be always evaluated accurately without being influenced by temperature, the test can be easily carried out and the reliability can be improved easily.

Further, according to the embodiment of the present invention, a coating film adhesion test apparatus capable of evaluating the adhesion force of a coating film applied to a ship operating in a cryogenic environment such as an LNG carrier using a temperature control chamber 500 can be provided under the same conditions as in a cryogenic environment I want to.

1 is a perspective view of a coating film adhesion testing apparatus according to an embodiment of the present invention,
Fig. 2 is a cross-sectional view showing one portion of Fig. 1,
3 is a side cross-sectional view of the pulling grip portion of FIG. 1,
4 is a perspective view illustrating a pulling grip portion according to another embodiment of the present invention;
FIG. 5 is a side sectional view showing the test bed portion of FIG. 1,
6 is a perspective view showing a state in which an environmental chamber is installed in the coating film adhesion test apparatus of FIG. 1,
7 and 8 are operational state diagrams for explaining operation according to an embodiment of the present invention;

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, configurations and operations according to embodiments of the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE INVENTION The following description is one of many aspects of the claimed invention and the following description may form part of the detailed description of the invention.

However, the detailed description of known configurations or functions in describing the present invention may be omitted for clarity.

While the invention is susceptible to various modifications and its various embodiments, it is intended to illustrate the specific embodiments and the detailed description. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.

Hereinafter, an apparatus for testing the adhesion of a coating film according to an embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a perspective view showing a coating film adhesion testing apparatus according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view showing a part of FIG.

Referring to FIGS. 1 and 2, a coating film adhesion testing apparatus according to an embodiment of the present invention may include a coating film test piece 100, a dolly 200, a pulling grip portion 300, and a test bed portion 400 have.

The coating film test piece 100 is a kind of specimen having a coating film 110 formed thereon. The coating film test piece 100 can be manufactured to have a predetermined size for testing the adhesion of the coating film 110, It may be made of the same material as the hull, for example, a steel plate, and a coating film that has undergone the same process as the coating process of the hull may be applied thereon to form the coating film 110. Therefore, the coating film test piece 100 can be regarded as a part of the hull having completed the painting operation.

The dolly 200 may be attached to the surface of the paint film 110 using a special adhesive and protrude above the paint film test piece 100. The dolly 200 may be a means for helping the paint film 110 to be destroyed (desorbed) from the paint film test piece 100 by receiving a tensile force applied from the outside. The upper portion of the dolly 200 may be provided with a locking protrusion 210 so as to easily receive an external tensile force.

The pulling grip portion 300 is configured such that one end is coupled to the tensile force providing means 10 and the other end is coupled with the dolly 200 to transmit tensile force to the dolly 200.

The tensile force providing means 10 is a device for generating a tensile force by a mechanical mechanism without using hydraulic pressure or pneumatic pressure and can be used without any change in performance or inability to use because there is no element affected by temperature even in a cryogenic environment. Since the tensile force providing means 10 belongs to a generally known technology, a detailed description thereof will be omitted.

Hereinafter, the pulling grip portion 300 will be described with reference to FIGS. 3 and 4. FIG.

FIG. 3 is a side cross-sectional view of the pulling grip portion of FIG. 1, and FIG. 4 is a perspective view of a pulling grip portion according to another embodiment of the present invention.

3, the pulling grip portion 300 according to an embodiment of the present invention may include a rod portion 310, a cylinder portion 320, a piston portion 330, and a coupling portion 340 .

The rod portion 310 may be disposed at the uppermost end of the pulling grip portion 300 and may be detachably coupled to the tensile force providing means 10 to receive tensile force from the tensile force providing means 10 and transfer the tensile force to the dolly 200 .

The rod portion 310 may be coupled to the tensile force providing means 10 through a coupling pin 311 so as to be detachably coupled to the tensile force providing means 10. In order to insert the coupling pin 311, A pin hole 312 may be formed in the pin hole 310.

The cylinder 320 may be coupled to a lower portion of the rod 310 and extend downward by a predetermined length. The piston portion 330 is disposed at a lower portion of the cylinder portion 320 and may be inserted into the cylinder portion 320 so as to protrude from the cylinder portion 320 toward the dolly 200.

The cylinder portion 320 may be screwed with at least one of the rod portion 310 and the piston portion 330 to adjust the distance from the dolly 200. Therefore, when the cylinder 320 is rotated, the distance to the dolly 200 is adjusted, and the height of the tensile force providing means 10 is not directly adjusted, so that the height of the cylinder 320 can be easily adjusted .

The cylinder portion 320 is screwed to the rod portion 310 to adjust the distance to the dolly 200 by adjusting the length of the rod portion 310 and the piston portion 330 May be simply inserted into the cylinder 320, but may be modified as necessary. A hook 331 may be formed at the upper end of the piston 330 to transmit a tensile force to the piston 330 when the cylinder 320 is lifted.

The coupling part 340 is disposed at the lower end of the piston part 330 and is connectable to the dolly 200. One end of the coupling part 340 is connected to the piston part 330, And the other end may be engaged with the dolly 200.

When the moving part 341 is pushed in the height direction as in the case of connecting the hose for washing machine, for example, the coupling part 340 extends the lower end diameter of the fixing part 342 and the locking projection 210 of the dolly 200 is extended The locking part 210 can be inserted into the locking part 342 and restrained by the elastic force when the moving part 341 is released. Since the structure of the coupling portion 340 belongs to a well-known well-known technology, the illustration of the further description and drawings is omitted.

Meanwhile, as shown in FIG. 4, the pulling grip portion 300 may have a very simple structure. The pulling grip part 300 according to another embodiment of the present invention is formed with a fin hole 301 at one end so as to be coupled with the tensile force providing means 10 and at the other end with a hooking protrusion 210 of the dolly 200 So that the latching groove 302 is formed.

The engaging groove 302 has a side open at the lower end of the pulling grip 300 so that the dolly 200 can be pushed from the side and coupled to the engaging groove 302 of the pulling grip 300.

FIG. 5 is a side sectional view showing the test bed part of FIG. 1, and FIG. 6 is a perspective view showing a state where an environmental chamber is installed in the coating film adhesion testing device of FIG.

5, the test bed part 400 is fixed to prevent the coating film test piece 100 from moving in a state where the coating film test piece 100 is placed. The test bed part 400 is disposed below the pulling grip part 300, So that the dolly 200 can protrude toward the pulling grip portion 300. [0052] As shown in FIG.

Here, the test bed unit 400 may include a base unit 410 and a grip unit 420.

The base portion 410 may have a latching portion 411 for catching the test piece 100 on the base 410. In addition, the base 410 may have an opening 412 in which a part of the latching part 411 is opened so that the dolly 200 is exposed upwardly.

Although the upper surface of the base 410 is the engaging portion 411 and the opening 412 is formed between the engaging portions 411 to expose the dolly 200, It is also possible to change to another structure.

Further, the grip unit 420 can be elevated and lowered on the base 410 to adjust the height in the height direction, and the coating film test piece 100 can be gripped with the base unit 410 by pressing.

When the coating film test piece 100 is placed on the gripping unit 420, the height of the gripping unit 420 is lowered so that the distance from the gripping unit 420 to the base unit 410 is increased and the coating film test piece 100 is gripped The height of the gripping unit 420 is increased to reduce the distance from the base unit 410 so that the test piece 100 is hooked on the engaging unit 411 of the base unit 410 and pressed.

2 and 5, the gripping unit 420 may include a stationary shaft 421, a moving shaft 422, a handle 423, and a support 424.

The stationary shaft 421 may be fixedly coupled to the lower side of the base 410 so as not to move.

The moving shaft 422 is screwed to the stationary shaft 421 and can be expanded or contracted in the height direction by rotation.

The handle 423 is coupled on the circumference of the moving shaft 422 to rotate the moving shaft 422 so that the moving shaft 422 can move in the height direction.

The supporting frame 424 is coupled to the upper end of the moving shaft 422 and is configured to receive the coating film test piece 100. The supporting frame 424 is fixed to the supporting frame 424 as the moving shaft 422 is moved in the height direction, Can be adjusted.

Therefore, the coating film test piece 100 can be gripped by the locking part 411 of the base part 410 while being adjusted in height in accordance with the movement of the moving shaft 422 in a state of being mounted on the supporting part 424 .

Meanwhile, referring to FIG. 6, the present embodiment may further include a temperature control chamber 500.

The temperature control chamber 500 is for evaluating the strength when the paint film 110 is broken at a cryogenic temperature by simulating environmental conditions at a cryogenic temperature. The test chamber 400 is enclosed and closed, The coating film test piece 100 can be tested at a predetermined temperature by maintaining the temperature at a predetermined temperature. Since the temperature of the temperature control chamber 500 is adjustable, not only the cryogenic temperature but also the high temperature condition can be made as necessary.

In order to set a predetermined temperature inside the temperature control chamber 500, a gas supply unit for supplying a high temperature or a low temperature gas may be provided at one side of the temperature control chamber 500, but a separate illustration is omitted. For example, liquefied nitrogen gas can be supplied to create a cryogenic environment.

The temperature control chamber 500 may be provided with a cutout 510 at upper and lower portions of the temperature control chamber 500 so as to surround the test bed unit 400 as needed. The cut-off portion 510 may be opened when the temperature control chamber 500 is installed in the test bed portion 400, and may be closed after completion of the installation to seal the inside of the temperature control chamber 500.

Hereinafter, the operation of this embodiment will be described with reference to Figs. 7 and 8. Fig.

7, the coating film test piece 100 having the coating film 110 formed thereon has to be fixed to the test bed part 400, so that the height of the gripping unit 420 is lowered, 424, respectively.

When the coating film test piece 100 is mounted on the support table 424, the handle 423 is rotated so that the support table 424 is moved upward by the movement shaft 422. The supporter 424 presses the coating film test piece 100 toward the engaging portion 411 of the base portion 410 so that the coating film test piece 100 is fixed without moving. At this time, the dolly 200 is adhered to the surface of the coating film 110 of the coating film test piece 100 by using an adhesive so that the upper end of the dolly 200 is exposed to the outside.

The pulling grip portion 300 is moved toward the coating film test piece 100 so that the coupling portion 340 coincides with the dolly 200. At this time, the distance between the pulling grip part 300 and the dolly 200 can be appropriately adjusted by rotating the cylinder part 320.

When the coupling between the dolly 200 and the coupling part 340 is completed, the piston part 330 may be partially inserted into the cylinder part 320 as shown in the right side of FIG. 7, 200 and to prevent tensile force from being transmitted to the dolly 200 before the test is started.

On the other hand, in order to test the adhesive force of the paint film 110, the pulling grip portion 300 is pulled upward through the tension providing means 10 as shown in FIG. When the pulling grip portion 300 is lifted up, the dolly 200 is not subjected to an external force until the engaging protrusion 331 of the piston portion 330 is caught by the cylinder portion 320, The tensile force is transmitted to the dolly 200 as the engaging jaw 331 is caught by the cylinder 320.

When the tensile force is continuously transmitted from the tensile force providing means 10 as shown in the right side of FIG. 8, the paint film 110 is broken (tear off), and the dolly 200 is finally separated from the paint film test piece 100, The tensile force providing means 10 may measure and represent the pressure or strength at the moment when the dolly 200 is separated.

Therefore, according to this embodiment, it is possible not only to test the breakage pressure (or strength) of the paint film 110 at room temperature, but also to test the paint film test piece 100 using the temperature control chamber 500 The breaking pressure (or strength) of the coating film 110 in a cryogenic temperature environment can be easily tested without being influenced by the temperature at all.

While the present invention has been described in connection with what is presently considered to be preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is to be understood that the invention is not limited thereto.

10: tensile force providing means 100:
110: Coating film 200: Dolly (Dolly)
210: engaging projection 300: pulling grip part
301, 312: a pin hole 302:
310: rod portion 311: engaging pin
320: cylinder part 330: piston part
340: Coupling part 400: Test bed part
410: Base portion 411:
412: opening 420: gripping unit
421: stationary shaft 422: moving shaft
423: Handle portion 424: Support
500: Temperature control chamber

Claims (8)

A coating film test piece on which a coating film was formed;
A dolly attached to the coating film and projecting onto the coating film test piece;
A pulling grip portion coupled to the tensile force providing means at one end and coupled to the dolly at the other end to transmit tensile force to the dolly; And
And a test bed portion disposed below the pulling grip portion and gripping the coated film test piece so that the dolly protrudes toward the pulling grip portion,
The test-
A base portion having an engaging portion to which the coating film test piece is applied and an opening portion in which the engaging portion is partially opened so as to expose the dolly; And
And a grip unit mounted on the base unit so as to be able to move up and down,
The gripping unit includes:
A stationary shaft fixed to a lower portion of the base portion;
A movable shaft screwed to the stationary shaft and capable of expanding in the height direction;
A handle coupled to a circumference of the moving shaft to rotate the moving shaft; And
A supporting frame coupled to an upper end of the moving shaft, on which the coating test piece is mounted;
Wherein the adhesive force of the coating film is measured. The method according to claim 1,
The pulling-
A rod portion detachably coupled to the tensile force providing means;
A cylinder portion coupled to the rod portion;
A piston portion protruding from the cylinder portion toward the dolly; And
A coupling portion having one end coupled to the piston portion and the other end coupled to the dolly;
Wherein the adhesive force of the coating film is measured. 3. The method of claim 2,
Wherein the cylinder portion is screwed with at least one of the rod portion and the piston portion to adjust the distance from the dolly. 3. The method of claim 2,
And the rod portion is coupled to the tensile force providing means via an engaging pin. delete delete The method according to claim 1,
Wherein the pulling grip portion has a pin hole formed at one end thereof so as to be coupled with the tensile force providing means and an engagement groove formed at the other end to engage with the dolly. The method according to claim 1,
And a temperature control chamber (500) which encloses the test bed part and hermetically closes the inside of the test bed part so that the inside of the test bed part can be tested at a predetermined temperature condition by keeping the inside at a predetermined temperature.

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