Portable rubbing test apparatus

Abstract

To provide a portable rubbing test apparatus having good reproducibility of rubbing tests and capable of being carried to a site to test actual objects.SOLUTION: A portable rubbing test apparatus 10 of the present invention has a carriage 20 having a plurality of wheels 22 and capable of reciprocating on a coating film surface. The carriage 20 includes gauze holding means 30 extending from a lower surface toward the coating film surface and detachably holding, at the tip thereof, a gauze 32 in contact with the coating film surface. The carriage 20 further includes pressing means 40 between the carriage 20 and the gauze holding means 30, for pressing the gauze holding means 30 against the coating film surface with a predetermined pressure.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a portable rubbing test device that can perform a rubbing test to check the progress of curing and drying of a coating film. [Background technology]

[0002] A common method for evaluating the degree of drying and hardening of paints and coatings is the rubbing test. This test evaluates the durability and hardness of a paint film by rubbing the surface of the paint film under specific conditions. One example of a specific procedure, performed manually by a worker on-site, involves soaking a specified size of gauze with several milliliters of an organic solution (such as methyl ethyl ketone). The gauze is then lightly pressed against the painted surface with a finger, and the surface is rubbed back and forth 50 times. The condition of the gauze and test piece is then evaluated against a rating sheet (on a scale of 1 to 5).

[0003] On the other hand, there is also a method using a rubbing tester indoors (for example, as disclosed in Patent Document 1). In this method, a test piece coated with a coating is first prepared. The test piece is then attached to the rubbing tester. The test conditions (rubbing speed, pressure, distance, etc.) are appropriately set according to the purpose and standards of the test. A specific friction force is applied to the coating surface of the test piece, and rubbing is carried out under certain conditions. After the test, the condition of the coating is observed, and the degree of wear and damage is evaluated. This includes peeling, cracking, peeling, and surface discoloration of the coating.

[0004] However, when tests are performed manually by workers on-site, test conditions (friction speed, pressure, distance, etc.) vary depending on the worker's skill, resulting in different test results and low reproducibility. Furthermore, the evaluation of test results is heavily dependent on the tester's subjective judgment, which can lead to a lack of consistency. To overcome these problems, there are methods for objective evaluation using automated testing equipment, but the test targets are test specimens, making it impossible to bring them to the actual site and test actual objects (large structures such as bridges). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 11-48402 Summary of the Invention [Problem to be solved by the invention]

[0006] In view of the above-mentioned problems of the prior art, the problem to be solved by the present invention is to provide a portable rubbing test device which has good reproducibility of rubbing tests and can be brought to the site to test actual products. [Means for solving the problem]

[0007] As a first means for solving the above problems, the present invention provides a coating film surface treatment device including a carriage having a plurality of wheels and capable of reciprocating on the coating film surface, The carriage includes a gauze holding means that extends from the underside toward the coating film surface and detachably holds a gauze at its tip so as to come into contact with the coating film surface; The object of the present invention is to provide a portable rubbing test device characterized by comprising a pressing means disposed between the carriage and the gauze holding means for pressing the gauze holding means against the coating film surface with a predetermined pressure. According to the first method, the device is portable and can be brought to the site to test the actual object. Rubbing tests can be performed on the coating film not only on the floor but also on the wall and ceiling surfaces of the site. In addition, the force with which the gauze is pressed against the coating surface can be kept constant, which improves the reproducibility of the rubbing test.The simple and inexpensive construction of a dolly can improve the reproducibility of the rubbing test.

[0008] As a second means for solving the above-mentioned problems, the present invention provides a portable rubbing test device according to the first means, characterized in that the pressing means has an elastic body and a sliding part made up of a plurality of concentrically arranged, mutually fitted cylinders having different diameters that contain the elastic body therein and expand and contract in the biasing direction of the elastic body. According to the second means, when the gauze holding means, which is perpendicular to the pressing direction of the gauze, moves back and forth on the cart, a force is applied from the lateral (horizontal) direction to the coil spring, which extends in the longitudinal (vertical) direction relative to the cart, causing the shape of the coil spring to be distorted, twisting, and shifting laterally, which may result in deformation.However, the cylindrical structure that encases the coil spring prevents such distortion and twisting, making it possible to continue pressing the gauze holding means with a predetermined pressure.

[0009] As a third means for solving the above-mentioned problems, the present invention provides a portable rubbing test device according to the first or second means, characterized in that it further comprises a pressure changing means for increasing or decreasing the external force acting on the elastic body of the pressing means to change the pressing pressure within a set range. According to the third means, the pressing force can be easily changed in accordance with the floor, wall, and ceiling surfaces on which the gravity acting on the elastic body varies.

[0010] As a fourth means for solving the above-mentioned problems, the present invention provides a portable rubbing tester according to the third means, characterized in that the pressing force changing means is provided with a scale indicating a measurement range of the pressing force with which the gauze holding means is pressed against the coating film surface on the floor, wall or ceiling. According to the fourth means, the pressing force can be easily changed within the set range depending on the floor, wall, and ceiling surfaces on which the gravity acting on the elastic body differs. [Effects of the Invention]

[0011] According to the present invention, the force with which the gauze is pressed against the coating surface can be made constant, thereby improving the reproducibility of the rubbing test. Furthermore, since the device is portable, it can be brought to the site and used to test the actual product. This reduces the burden on the operator, as they only need to concentrate on moving the cart back and forth without worrying about the contact pressure of the gauze. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is a side view of a portable rubbing test device of the present invention. [Figure 2]10A and 10B are side and bottom views of a gauze holding means. [Figure 3] FIG. 10 is a side view of a modified portable rubbing test device. [Figure 4] FIG. 10 is a partially enlarged side view of a modified portable rubbing test device (excluding wheels). [Figure 5] FIG. 1 is an explanatory diagram showing a portable rubbing test device of the present invention applied to a wall surface. [Figure 6] FIG. 1 is an explanatory diagram showing a portable rubbing test device according to the present invention applied to a ceiling surface. DETAILED DESCRIPTION OF THE INVENTION

[0013] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the portable rubbing test device of the present invention will be described in detail below with reference to the drawings.

[0014] [Portable rubbing test device 10] Figure 1 is a side view of the portable rubbing tester of the present invention. Figure 2 is a side view and a bottom view of the gauze holding means. As shown, the portable rubbing tester 10 of the present invention includes a cart 20 having multiple wheels 22 and capable of reciprocating over a coating surface. The cart 20 is equipped with a gauze holding means 30 that detachably holds a gauze 32 at its tip, extending from its underside toward the coating surface and contacting the coating surface, and a pressing means 40 that is positioned between the cart 20 and the gauze holding means 30 and presses the gauze holding means 30 against the coating surface with a predetermined pressure. The surface G on which the cart 20 shown in Figure 1 is placed is the main surface (floor, wall, ceiling, etc.) of a bridge or other structure where a coating is formed.

[0015] The cart 20 is provided with a plurality of wheels 22 on its body. In this embodiment, the cart is configured with four wheels, but at least three wheels are sufficient. The cart is rectangular in plan view and is made of a material with a predetermined strength, such as a reinforced plastic resin such as polycarbonate (PC) or polypropylene (PP). The four axles of the cart are supported in a direction perpendicular to the longitudinal direction of the cart, and the cart 20 can move back and forth linearly along the longitudinal direction of the cart (arrow A in FIG. 1). The size of such a cart 20 is, for example, approximately 10 cm in length, 5 cm in width, and 5 cm in height, which is set to a size that allows an operator to easily move it back and forth with one hand.

[0016] The gauze holding means 30 is a means for bringing a predetermined area of ​​gauze 32 into contact with the surface G on which the dolly 20 is placed. The gauze holding means 30 has the gauze 32, a gauze head 34, and a detachable portion 36. The gauze 32 is a woven fabric for rubbing the coating film, and other fabrics having a predetermined flexibility can also be used.

[0017] The gauze head 34 is a rectangular parallelepiped member having a rectangular plane of a predetermined area on its underside, and is made of a reinforced plastic resin with a predetermined strength. The gauze head 34 is chamfered to remove edges and corners. This prevents the pressing force from the pressing means 40 (described later) from concentrating locally on the corners, and ensures that the pressing force is received evenly across the entire rectangular plane. In addition, the gauze head 34 has protruding mounting holes 34a on both sides along the longitudinal direction of the cart 20, through which bolts 36a of the detachable part 36 (described later) are inserted. As an example, the rectangular plane of the gauze head 34 is the size of two fingertips (approximately 3 cm square).

[0018] The detachable part 36 is a member that detachably attaches the gauze 32 to the gauze head 34, and in this embodiment, as an example, includes a bolt 36a, a nut 36b, and a plate 36c. The bolt 36a is a stud bolt with threads on both ends, and is inserted into the aforementioned attachment holes 34a provided on opposing sides of the gauze head 34. The nuts 36b are threaded onto both ends of the bolt 36a. The plate 36c is a flat plate that is longer than the gauze head 34, and has insertion holes for the bolt 36a on both ends.

[0019] To attach the gauze 32 using the gauze holding means 30 configured as described above, first, the gauze 32 is brought into contact with both sides of the gauze head 34 that do not have the mounting holes 34a—in other words, from one side in the direction of travel of the carriage to the rectangular flat surface below and then to the other side. The gauze 32 is then held down by a pair of plates 36c, sandwiching both sides. Bolts 36a are inserted through the insertion holes of the plates 36c and the mounting holes 34a of the gauze head 34, and nuts 36b are threaded onto both ends of the bolts 36a to tighten them. This securely attaches the gauze 32 to the gauze head 34, preventing it from falling off during the rubbing operation. The gauze 32 can be attached and detached using the gauze holding means 30 using any suitable method, as long as it prevents it from falling off during the rubbing operation. Other methods, such as clips, hooks, hook-and-loop fasteners, and rubber bands, may also be used.

[0020] The pressing means 40 is made up of an elastic body 48 and a sliding portion 41, and is a means for pressing the gauze holding means 30 against the coating surface with a predetermined pressure. The elastic body 48 has a predetermined elastic force, and has the property of compressing or expanding when an external force is applied and returning to its original shape when the external force is removed. In this embodiment, a coil spring is used as an example. The sliding portion 41 is a member that slides along the expansion and contraction direction of the elastic body 48, and has a main body 42, a cylindrical member 44, and a cylindrical container member 46. The main body 42 is a cylindrical container with a sealed top and an open bottom. The main body 42 is fixed to the center of the cart 20 so that its axis is perpendicular to the main surface of the cart 20. The cylindrical member 44 is a cylinder that fits into the inner periphery of the main body 42, and is fixed inside the main body 42. The cylindrical container member 46 is a member that fits into the inner periphery of the cylindrical member 44, and is configured to be movable toward and away from the cylindrical member 44. The cylindrical container member 46 is open at the top and sealed at the bottom. The cylindrical container member 46 contains the elastic body 48 in its internal space. One end of the elastic body 48, which is longer than the cylindrical container member 46, contacts the bottom surface of the cylindrical container main body 42 (the backside of the upper surface when viewed from above the cart 20), and the other end contacts the bottom surface of the cylindrical container member 46, pressing (pushing) the cylindrical container member 46 directly downward from the main body 42 and the cylindrical member 44. The upper surface of the gauze head 34 described above is fixed to the lower surface of the cylindrical container member 46.

[0021] The pressing means 40 configured in this manner can press the gauze holding means 30 against the coating surface with a predetermined pressure. The elastic body 48 can be easily removed by removing the cylindrical container member 46 from the cylindrical member 44. If multiple elastic bodies 48 with the same shape but different elastic forces are prepared, the elastic force can be easily changed by replacing the elastic body 48.

[0022] [Variations] FIG. 3 is a side view of a modified portable rubbing tester. FIG. 4 is a partially enlarged side view of a modified portable rubbing tester (excluding wheels). FIG. 5 is an explanatory diagram of the portable rubbing tester of the present invention applied to a wall surface. FIG. 6 is an explanatory diagram of the portable rubbing tester of the present invention applied to a ceiling surface. As shown in the figures, the modified portable rubbing tester 10A is equipped with a pressure change means 50 that can arbitrarily change the pressing force of the pressing means 40A. The other configurations are the same as those shown in FIGS. 1 and 2, and provide the same functions and effects, so detailed description will be omitted.

[0023] The pressing means 40A has an elastic body 48, a main body 42A, and a cylindrical container member 46A. The main body 42A is cylindrical and fixed to the center of the cart 20 so that its axis is perpendicular to the main surface of the cart 20, with its top and bottom open. The cylindrical container member 46A is a member that fits into the inner periphery of the main body 42A and is configured to be movable toward and away from the main body 42A. The cylindrical container member 46A has an open top and a closed bottom, and houses an elastic body 48 in its internal space. One end of the elastic body 48 contacts the bottom surface of the cylindrical container member 46A, and the other end has a lid 49 placed on it. The lid 49 is a disk member with a diameter smaller than the inner periphery of the cylindrical container member 46A.

[0024] The pressure changing means 50 has an L-shaped arm 54 , a pressure adjusting screw 52 , and a scale 58 . The L-shaped arm 54 is a member that is provided around the main body 42A of the cart 20, protrudes vertically from the main surface of the cart 20, and is bent at an upper end by 90 degrees (horizontally). A screw hole 56 is provided at the tip of the L-shaped arm 54. The axis of the screw hole 56 is aligned in the same line as the axis of the pressing means 40A. The pressure adjusting screw 52 is threaded into the screw hole 56, and its axis is aligned with the axis of the elastic body 48. The tip of the pressure adjusting screw 52 is brought into contact with the upper surface of the cover 49 of the pressing means 40A, and by tightening it, the elastic body 48 can be compressed. A scale 58 is provided on the upper surface of the L-shaped arm 54.

[0025] The scale 58 indicates a predetermined range of measurement values ​​using the unit of the spring pressure of the elastic body 48, for example, force applied per square millimeter (N / mm2). In this embodiment, the pressing force setting range of the pressing means 40, 40A is set to a range of 0.3 to 1.0 N / mm2, so the scale range indicates 0 to several N / mm2. Furthermore, the cart 20 may contact not only the floor surface but also a wall surface or a ceiling surface. In the case of a floor surface, the pressing force is the weight of the elastic body 48 added. In the case of a wall surface, the pressing force is the weight of the elastic body 48 added in part. In the case of a ceiling surface, the pressing force is the weight of the elastic body 48 subtracted from the pressing force. Therefore, the scale 58 indicates predetermined ranges (measurement ranges) of three types of measurement values ​​adjusted by subtracting the weight of the elastic body 48 for each of the wall surface and the ceiling surface (see FIG. 3).

[0026] [Effect] The operation of the portable rubbing test device 10 of the present invention having the above-described configuration will be described below. A worker carries the cart 20 with the gauze 32 attached to the gauze holding means 30 to the work site and contacts it with the coating surface (floor, wall, ceiling, etc.) at the work site to adjust the pressing force so that it falls within the set range (0.3 to 1.0 N / mm2). In the case of the portable rubbing tester 10, the pressing force can be adjusted by replacing the elastic body 48. In the modified portable rubbing tester 10A, the pressing force can be adjusted using the pressure adjustment screw 52 and scale 58 of the pressing force changing means 50. As an example of the next method, gauze 32 is soaked in several milliliters of an organic solution (such as methyl ethyl ketone). The gauze 32 is pressed against the coating surface at the site with a predetermined pressure, and the cart 20 is rubbed back and forth 50 times. After that, the condition of the gauze 32 and the coating surface at the site is evaluated against an evaluation table (on a scale of 1 to 5).

[0027] The portable rubbing tester of the present invention allows a constant pressure to be applied throughout the test, making it possible to improve reproducibility without relying on the experience of the operator. The pressure with which the gauze is pressed against the coating surface can be freely changed, allowing the rubbing test to be performed according to the strength of the coating. Since the pressure changing means is provided with a scale, the pressure setting range can be easily adjusted with good reproducibility. In addition, the device is portable, so it can be brought to the site and used to test the actual object.Rubbing tests can be performed with good reproducibility on coated floors, walls, and ceilings.

[0028] Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and various modifications can be made without departing from the spirit and scope of the present invention. Furthermore, the present invention is not limited to the combinations shown in the embodiments, but can be implemented in various combinations. [Explanation of symbols]

[0029] 10,10A Portable Rubbing Tester 20 carts 22 wheels 30 Gauze holding means 32 gauze 34 Gauze Head 34a Mounting hole 36 Detachable part 36a bolt 36b Nut 36c plate 40, 40A Pressing means 41 Sliding part 42,42A main body 44 Cylindrical member 46, 46A Cylindrical container member 48 Elastic Body 49 Lid 50 Pressure change means 52 Pressure adjustment screw 54 L-shaped arm 56 screw holes 58 scales G side

Claims

1. A cart having a plurality of wheels and capable of reciprocating on the coating surface is provided, The carriage includes a gauze holding means that extends from the underside toward the coating film surface and detachably holds a gauze at its tip so as to come into contact with the coating film surface; a pressing means disposed between the carriage and the gauze holding means for pressing the gauze holding means against the coating film surface with a predetermined pressure;

2. 2. The portable rubbing test device according to claim 1, The portable rubbing test device is characterized in that the pressing means has an elastic body and a sliding part consisting of a plurality of cylinders that contain the elastic body therein, have different diameters that expand and contract in the biasing direction of the elastic body, are arranged concentrically, and fit together.

3. 3. The portable rubbing test device according to claim 1 or 2, A portable rubbing test device comprising a pressure changing means for changing the pressure within a set range by increasing or decreasing the external force acting on the elastic body of the pressing means.

4. 4. The portable rubbing test device according to claim 3, The portable rubbing test device is characterized in that the pressing force changing means is provided with a scale indicating a measurement range of the pressing force with which the gauze holding means is pressed against the coating film surface on the floor, wall or ceiling.

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