A coating adhesion testing device with controllable pulling angle

Abstract

The present invention relates to the technical field of adhesion testing equipment, and specifically to a coating adhesion testing device with controllable pulling angle, comprising a base, a fixing member that fixes the base to a test piece, and a tape directional support unit disposed on the base, wherein a passage hole for allowing a measuring tape to pass through the base is disposed on the base along the thickness direction of the base, and the tape directional support unit comprises an angle measuring device for determining the inclination angle of the measuring tape and a support frame for maintaining the inclination angle of the measuring tape. Since the inclination angle of the measuring tape is maintained by the support frame, the measuring tape will not change its inclination angle due to changes in the pulling direction of the measuring personnel, thereby standardizing the adhesion measurement process, reducing measurement errors, and improving measurement accuracy.

Description

Technical Field

[0001] The invention relates to the technical field of adhesion testing equipment, and in particular to a coating adhesion testing device with controllable pulling angle. Background Art

[0002] After the corresponding process of coating products, a protective or decorative coating layer is formed on the surface of the coated object. However, only when the coating film is firmly attached to the coated object or the object to be coated can the purpose of protection or decoration be achieved. The coating film and the coated surface are combined together through physical and chemical effects. The firmness and durability of the adhesion of the coating film on the coated object are one of the important factors affecting the service life or aesthetic durability of the coated object. The coated surface can be a bare substrate or a painted substrate. The bonding force between the coating film and the coated surface can be roughly divided into two situations: one is that the coating forms a film after a chemical reaction, and the polar groups of the polymer in the paint film (such as hydroxyl or carboxyl) react with the polar groups on the surface of the coated object to form a cross-linking bonding force; the other is that the coating product forms a film in a physical way, and the bonding force is the van der Waals force, hydrogen bond and other forces formed between the paint film and the coated object.

[0003] At present, the coating adhesion test methods are divided into the cross-cut method and the pull-off method, with a total of six standard test methods. Among them, the cross-cut method is the most widely used and most convenient in the coating industry. In the cross-cut method, three cross-cutting methods are used for testing, namely the circle method (corresponding to the standard GB / T 1720), the X method (corresponding to the standard ASTM D 3359-A, JIZK5400), and the hundred grid method (corresponding to the standard ASTM D 3359-B, GB / T 9286, ISO2409, BS 3900-E6, GB / T5270, ASTM B571). The requirements for test instruments in these three cross-cut tests are different. The circle method requires a circle adhesion tester, the X method requires a ruler and a knife, and the hundred grid method requires a hundred grid board or a hundred grid knife. Among them, after the test panel is gridded by the X-grid method and the 100-grid method, it is necessary to fully bond the grids with pressure-sensitive tape, and then tear off the tape along the angle specified by the standard or the angle specified by the customer to evaluate the firmness of the paint film.

[0004] In the current test, the X-method is relatively simple, that is, use a ruler to cross-cut and penetrate the diagonal direction of the test plate, and then stick a standard tape on the surface of the grid and tear off the tape at a certain angle to observe the adhesion strength of the surface coating; the instruments and tools for the 100-grid method adhesion are mainly 100-grid plates or 100-grid knives. This method and tools use tools of certain specifications to cut and penetrate the coating into a grid pattern, cut horizontally and vertically to form 100 square grids, and then stick a standard tape on the surface of the grid and tear off the tape at a certain angle to observe the adhesion strength of the surface coating, and grade it according to the severity of coating falling off. In these two grid-cutting methods, after the grid is crossed, it is necessary to use standard tape to stick and tear the surface of the grid, and the tearing angle is specified. The tearing angle is different, and the situation and severity of paint falling off will be different.

[0005] However, in actual tearing, due to the differences in experimenters, equipment, environment, tearing angles and the fixation of the test plate and the tape, the current testing instruments and equipment have the following problems:

[0006] 1. The tearing angle is not accurate. For example, ASTM D 3359-B requires the tearing angle to be 180°, but the operator tears at 160° or 150°. The tearing force on the paint film at the cross section will be different from the standard requirements. In GB / T 9286 and ISO2409 standards, the tearing angle is required to be 60° after the tape is pasted. In actual operation, it is difficult to accurately determine 60°. It is difficult for the operator to accurately determine 60° based on subjective feeling.

[0007] Second, the repeatability and reproducibility are poor. Due to the first problem, when repeating and reproducing the test, the test results of the tester and / or the same tester at different times will be affected by the angle and change;

[0008] 3. Poor convenience. During the test, after the tape is fully in contact with the scratched coating and adhered, the test board is often torn together when it is torn off. The movement of the test board will cause the failure of the test. Summary of the invention

[0009] The object of the present invention is to provide a coating adhesion testing device with controllable pulling angle, so as to solve the problems in the prior art of inaccurate and unstable pulling angle of the measuring tape when performing coating adhesion testing.

[0010] To achieve the above object, the basic scheme of the present invention is as follows:

[0011] A coating adhesion testing device with controllable pulling angle comprises a base, a fixing member for fixing the base to a workpiece to be tested, and a tape directional support unit arranged on the base, wherein a passage hole for accommodating the passage of a measuring tape is arranged on the base along the thickness direction of the base and penetrates the base, and the tape directional support unit comprises an angle measuring device for determining the inclination angle of the measuring tape and a support frame for maintaining the inclination angle of the measuring tape.

[0012] The principle and beneficial effects of the basic solution of the coating adhesion testing device with controllable pulling angle of the present invention are:

[0013] Draw a grid in the test area of ​​the test surface of the test piece, bond the measuring tape well to the surface of the test area of ​​the test piece, leave a margin for pulling at the end of the measuring tape, adjust the angle measuring instrument to the specified measuring angle, pass the end of the measuring tape through the through slot on the base, use the angle measuring instrument to adjust the inclination angle of the end of the measuring tape to the specified angle and use the support frame to maintain the inclination angle of the measuring tape, fix the base and the test piece with a fixing piece, pull the measuring tape at the end of the measuring tape in the inclination direction of the measuring tape to measure the coating adhesion.

[0014] During the pulling process of the measuring tape, since the support frame maintains the inclination angle of the measuring tape, the measuring tape will not change its inclination angle due to changes in the pulling direction of the measuring personnel, thereby standardizing the adhesion measurement process, reducing measurement errors and improving measurement accuracy.

[0015] Further, the angle measuring device includes a horizontally arranged fixed plate and a movable plate rotatably connected to the fixed plate, the fixed plate and the movable plate are both U-shaped plates, the open end of the fixed plate is arranged opposite to the open end of the movable plate, the fixed plate is arranged on the upper surface of the base and fixedly connected to the base, the open end of the fixed plate is located above the through hole, and a first rotating shaft is coaxially arranged horizontally between the two side plates of the open end of the fixed plate and the two side plates of the open end of the movable plate, the fixed plate and the movable plate are rotatably connected through two coaxially arranged first rotating shafts, the outer side of the fixed plate is fixedly connected to a reading plate for reading the angle of the movable plate rotated around the first rotating shaft, and after the movable plate is flipped to rotate the movable plate around the first rotating shaft by a certain angle, the angle reading between the movable plate and the base surface can be read from the reading plate.

[0016] The cam is an assembly made up of two members, each of which is adapted to move along a first axis which is perpendicular to the axis of the base and to move along a second axis which is perpendicular to the axis of the base. The nut seat is provided with a push rod, one end of the push rod is hinged to the nut seat, and the other end of the push rod is hinged to the connecting plate. When the threaded rod is rotated, the threaded transmission causes the nut seat to move on the threaded rod. When the nut seat moves toward the direction close to the movable plate, the push rod hinged to the nut seat pushes the support plate to rotate around the first rotating shaft. When the support plate rotates to a certain angle with the base and the threaded rod is no longer rotated, the nut seat is self-locked on the threaded rod. At this time, a stable triangular structure is formed among the threaded rod, the push rod and the base to keep the support plate fixed.

[0017] Furthermore, in order to allow the movable plate to remain stationary after rotating at any angle so as to facilitate reading of the rotation angle of the movable plate, the first rotating shaft is configured as a damping rotating shaft.

[0018] Furthermore, the fixing member is one or more of a strap, a screw, a caliper or a strong magnet.

[0019] Furthermore, in order to facilitate the rotation of the threaded rod, a hand wheel is fixedly connected to one end of the threaded rod extending out of the base. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the main viewing direction structure of the present invention.

[0021] Figure 2 This is a schematic diagram of the structure when looking down after the movable plate and the supporting plate are laid flat.

[0022] Figure 3 This is a schematic diagram of the structure in the main viewing direction when the upper surface of the movable plate is attached to the measuring tape.

[0023] Figure 4 This is a schematic diagram of the structure in the main viewing direction when the movable plate is flipped and laid flat.

[0024] Figure 5 It is a structural schematic diagram of the first chute. DETAILED DESCRIPTION

[0025] The following is further described in detail through specific implementation methods:

[0026] The figure marks in the drawings of the specification include: a piece to be tested 10, a base 20, a through hole 201, a fixed plate 301, a movable plate 302, a first rotating shaft 303, a reading plate 304, a support plate 401, a connecting plate 402, a connecting shaft 403, a gap 404, a first slide groove 405, a threaded rod 406, a nut seat 407, a second slide groove 408, a second slide plate 409, a push rod 501, a measuring tape 60, and a handle 70.

[0027] Example 1

[0028] A coating adhesion testing device with controllable pulling angle in the present embodiment comprises a base 20, a fixing member fixing the base 20 to a test piece 10 and a tape directional support unit arranged on the base 20, wherein the fixing member is one or more of a strap, a screw or a caliper, and a strap is preferably used in the present embodiment. A passage hole 201 for accommodating a measuring tape 60 to pass through the base 20 is arranged on the base 20 along the thickness direction of the base 20, and the tape directional support unit comprises an angle measuring device for determining the inclination angle of the measuring tape 60 and a support frame for maintaining the inclination angle of the measuring tape 60.

[0029] like Figure 1 , Figure 2 As shown, the angle measuring device includes a horizontally arranged fixed plate 301 and a movable plate 302 rotatably connected to the fixed plate 301. The fixed plate 301 and the movable plate 302 are both U-shaped plates. The open end of the fixed plate 301 is arranged opposite to the open end of the movable plate 302. The fixed plate 301 is arranged on the upper surface of the base 20 and is fixedly connected to the base 20. The open end of the fixed plate 301 is located above the passage hole 201. The first rotating shaft 303 is coaxially arranged between the two side plates of the open end of the fixed plate 301 and the two side plates of the open end of the movable plate 302 horizontally, so that the movable plate 302 can stay fixed after rotating at any angle. The first rotating shaft 303 is set as a damping rotating shaft, the fixed plate 301 and the movable plate 302 are rotatably connected through two coaxially arranged first rotating shafts 303, the outer side of the fixed plate 301 is fixedly connected to the reading plate 304, and the reading plate 304 is engraved with scale lines and corresponding degree marks for measuring the flipping angle of the movable plate 302. When the movable plate 302 is flipped to rotate the movable plate 302 around the first rotating shaft 303 for a certain angle, the upper surface of the movable plate 302 is rotated to be aligned with a certain scale line on the reading plate 304 and the reading mark corresponding to the scale line is the degree of the angle between the movable plate 302 and the base 20.

[0030] like Figure 1 , Figure 2 As shown, the support frame includes two parallel supporting plates 401, one end of one supporting plate 401 is rotatably connected to the first rotating shaft 303 on one side of the fixed plate 301, one end of the other supporting plate 401 is rotatably connected to the first rotating shaft 303 on the other side of the fixed plate 301, and a connecting plate 402 is horizontally arranged between the two supporting plates 401, one end of the connecting plate 402 is fixedly connected to one supporting plate 401, and the other end of the connecting plate 402 is fixedly connected to the other supporting plate 401, and the middle part of the connecting plate 402 is fixedly connected to the hinge seat, when the supporting plate 401 and the movable plate 30 2 rotates around the first rotating shaft 303 at the same angle, the front end surface of the support plate 401 is coplanar with the upper surface of the movable plate 302, and two parallel connecting shafts 403 are arranged at one end of the support plate 401 away from the first rotating shaft 303. The connecting shafts 403 are arranged horizontally, one end of the connecting shaft 403 is rotatably connected to one support plate 401, and the other end of the connecting shaft 403 is rotatably connected to the other support plate 401. A gap is left between the two connecting shafts 403 to form a slit 404 for allowing the measuring tape 60 to pass through, and the slit 404 is coplanar with the front end surface of the support plate 401.

[0031] Combination Figure 1 , Figure 2 and Figure 5 A first slide groove 405 is horizontally arranged on the upper surface of the base 20 along a direction perpendicular to the axis of the first rotating shaft 303. A threaded rod 406 is horizontally arranged in the first slide groove 405 along the length direction of the first slide groove 405. One end of the threaded rod 406 is rotatably connected to the base 20, and the other end of the threaded rod 406 extends out of the base 20. The end of the threaded rod 406 extending out of the base 20 is fixedly connected to a handwheel for conveniently rotating the threaded rod 406. The threaded rod 406 is threadedly connected to a nut seat 407. A hinge seat is fixedly connected to the upper surface of the nut seat 407. The first slide groove 40 5 are provided with second slide grooves 408 along the length direction of the first slide groove 405, and the second slide plates 409 are integrally formed with the nut seat 407 on both sides of the side wall of the nut seat 407 close to the first slide groove 405, and the second slide plate 409 is arranged horizontally, and one end of the second slide plate 409 away from the nut seat 407 is located in the second slide groove 408 and slidably cooperates with the second slide groove 408, and a push rod 501 is arranged on the nut seat 407, one end of the push rod 501 is hinged to the hinge seat on the nut seat 407, and the other end of the push rod 501 is hinged to the hinge seat on the connecting plate 402.

[0032] When in use, a grid is drawn in the test area of ​​the test surface of the test piece 10, and the measuring tape 60 is well bonded to the test area of ​​the test piece 10. After the measuring tape 60 is bonded, the movable plate 302 is rotated and flipped around the first rotating shaft 303 to be aligned with the scale line of the specified angle on the reading plate 304, and the movable plate 302 keeps the flip angle unchanged under the damping of the first rotating shaft 303;

[0033] The handle 70 is rotated to move the nut seat 407 along the threaded rod 406 toward the movable plate 302. The nut seat 407 causes the support plate 401 to flip around the first rotation axis 303 through the push rod 501. When the front end surface of the support plate 401 is coplanar with the upper surface of the movable plate 302, the hand wheel is stopped.

[0034] like Figure 1 As shown, the end of the measuring tape 60 is passed through the passage hole 201 and then through the gap 404 between the two connecting shafts 403, and the measuring tape 60 is kept in a certain tension and in a flat state;

[0035] like Figure 3 As shown, the base 20 is moved so that the upper surface of the movable plate 302 is arranged coplanar with the measuring tape 60, and the base 20 is kept stationary and the base 20 is fixedly connected to the test piece 10 with a strap or screws;

[0036] like Figure 4 As shown, the movable plate 302 is rotated away from the measuring tape 60 to prevent the measuring tape 60 from being adhered to the movable plate 302 and affecting the pulling of the measuring tape 60, and the measuring tape 60 is pulled toward the extending direction of the end of the measuring tape 60 for measurement.

[0037] Since the nut seat 407 has a self-locking function on the threaded rod 406, the nut seat 407 will not move on the threaded rod 406 when the threaded rod 406 is not rotated. Therefore, when the handle 70 is not rotated, the push rod 501, the support plate 401 and the base 20 form a stable triangular structure. Therefore, after the base 20 and the workpiece 10 are fixedly connected with the fixing member, the adjusted angle of the support plate 401 remains unchanged. In the process of pulling the measuring tape 60, the inclination angle of the measuring tape 60 passing through the gap 404 between the two connecting shafts 403 on the support plate 401 is restricted by the two connecting shafts 403 and remains unchanged, thereby improving the measurement accuracy.

[0038] When the movable base 20 makes the upper surface of the movable plate 302 coplanar with the measuring tape 60, the inclination of the measuring tape 60 is the same as the inclination angle of the movable plate 302, so that the measuring tape 60 can accurately limit the inclination angle. After setting the inclination of the measuring tape 60, the movable plate 302 is rotated away from the measuring tape 60 to prevent the measuring tape 60 from sticking to the movable plate 302 when the measuring tape 60 is pulled and affecting the measurement result.

[0039] The above are only embodiments of the present invention, and the common knowledge such as the known specific structures and characteristics in the scheme are not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A coating adhesion test device with controllable pulling angle, characterized in that: The device comprises a base, a fixing member for fixing the base to the workpiece to be measured, and a tape directional support unit arranged on the base, wherein a passage hole for allowing the measuring tape to pass through the base is arranged on the base along the thickness direction of the base, and the tape directional support unit comprises an angle measuring device for determining the inclination angle of the measuring tape and a support frame for maintaining the inclination angle of the measuring tape; The angle measuring device comprises a fixed plate horizontally arranged on the upper surface of the base and a movable plate rotatably connected to the fixed plate, the fixed plate and the movable plate are both U-shaped, the open end of the fixed plate is arranged opposite to the open end of the movable plate, the fixed plate is fixedly connected to the base, the open end of the fixed plate is located above the through hole, a first rotating shaft is horizontally coaxially arranged between the two side plates of the open end of the fixed plate and the two side plates of the open end of the movable plate, and a reading plate for reading the angle of rotation of the movable plate around the first rotating shaft is fixedly connected to the outer side of the fixed plate; The support frame includes two support plates arranged in parallel and rotatably connected to the first rotating shafts on both sides of the fixed plate, and a connecting plate fixedly connecting the two support plates. When the support plate and the movable plate rotate around the first rotating shaft at the same angle, the front end surface of the support plate is coplanar with the upper surface of the movable plate. A connecting shaft is arranged in parallel with the end of the support plate away from the first rotating shaft. The connecting shaft is arranged horizontally, and the two ends of the connecting shaft are rotatably connected to the two support plates respectively. A gap is formed between the two connecting shafts to allow the measuring tape to pass through. The gap is coplanar with the front end surface of the support plate. The base A first slide groove is horizontally arranged on the upper surface along a direction perpendicular to the axis of the first rotating shaft, a threaded rod is horizontally arranged in the first slide groove along the length direction of the first slide groove, one end of the threaded rod is rotatably connected to the base, the other end of the threaded rod extends out of the base, and a nut seat is threadedly connected to the threaded rod, and second slide grooves are arranged on both side walls of the first slide groove along the length direction of the first slide groove, and both sides of the side walls of the nut seat close to the first slide groove are fixedly connected to a second slide plate matching the second slide groove, and a push rod is arranged on the nut seat, one end of the push rod is hinged to the nut seat, and the other end of the push rod is hinged to the connecting plate.

2. The coating adhesion testing device with controllable pulling angle according to claim 1, characterized in that: The first rotating shaft is a damping rotating shaft.

3. The coating adhesion testing device with controllable pulling angle according to claim 2, characterized in that: The fixing member is one or more of a strap, a screw, a caliper or a strong magnet.

4. The coating adhesion testing device with controllable pulling angle according to claim 3, characterized in that: One end of the threaded rod extending out of the base is fixedly connected to a hand wheel.

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