CN114577717A

CN114577717A - Coating adhesive force testing device with controllable drawing angle

Info

Publication number: CN114577717A
Application number: CN202210353706.0A
Authority: CN
Inventors: 梅鹏; 王涛; 孟房军; 程榆高; 杨明勇; 杨明刚; 张明珠
Original assignee: Chongqing Huahui Painting Co ltd
Current assignee: Chongqing Huahui Painting Co ltd
Priority date: 2022-04-06
Filing date: 2022-04-06
Publication date: 2022-06-03

Abstract

The invention relates to the technical field of adhesive force testing equipment, in particular to a coating adhesive force testing device with a controllable pulling angle, which comprises a base, a fixing piece and an adhesive tape directional supporting unit, wherein the fixing piece is used for fixedly connecting the base with a piece to be tested, the adhesive tape directional supporting unit is arranged on the base, a through hole for allowing a measuring adhesive tape to pass through is arranged on the base along the thickness direction of the base, and the adhesive tape directional supporting unit comprises an angle measurer and a supporting frame, the angle measurer is used for determining the inclination angle of the measuring adhesive tape, and the supporting frame is used for keeping the inclination angle of the measuring adhesive tape. Because the support frame keeps the inclination angle of the measuring adhesive tape, the measuring adhesive tape can not change the inclination angle due to the change of the drawing direction of a measurer, so that the measuring process of the adhesive force is standardized, the measuring error is reduced, and the measuring accuracy is improved.

Description

Coating adhesive force testing device with controllable drawing angle

Technical Field

The invention relates to the technical field of adhesion testing equipment, in particular to a coating adhesion testing device with a controllable drawing angle.

Background

After the coating product is constructed by corresponding processes, a coating layer with a protective or decorative effect is formed on the surface of a coated object, but the purpose of protection or decoration for the user can be achieved only if the coating is firmly adhered to the coated object or the coated object. The coating film and the coated surface are combined together through physical and chemical actions, and the firmness and the durability of the adhesion of the coating film on a coated object are one of important influencing factors influencing the service life or the aesthetic durability of the coated object. The coated surface may 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 conditions: firstly, the coating forms a film after chemical reaction, and polar groups (such as hydroxyl or carboxyl) of a polymer in a paint film and polar groups on the surface of an object to be coated are crosslinked to form binding force after chemical reaction; secondly, the coating product is formed into a film in a physical mode, and the binding force is the acting force of Van der Waals force, hydrogen bond and the like formed between the paint film and the coated object.

At present, the method for testing the adhesive force of the coating film is divided into a grid dividing method and a pull-open method, and six standard testing methods are provided in total. Among them, the cross-cut method is most and most convenient to use in the paint industry. The cross-hatch method uses three cross-hatch methods for detection, namely, a circle-hatch method (corresponding to standard GB/T1720), a cross-hatch X method (corresponding to standard ASTM D3359-A, JIZK5400), and a check method (corresponding to standards ASTM D3359-B, GB/T9286, ISO2409, BS 3900-E6, GB/T5270, and ASTM B571). In the three kinds of grid-drawing tests, the requirements for a test instrument are different, a circle-drawing adhesion tester is required in a circle-drawing method, a straight ruler and a knife are required in an X-drawing method, and a grid plate or a grid knife is required in a grid-drawing method. After the test panel is scribed by the scribing X method and the scribing Baige method, the scribed part needs to be fully adhered by using a pressure sensitive adhesive tape, and then the firm degree of the paint film is evaluated by tearing the adhesive tape along the direction of a standard required specified angle or a customer specified angle.

In the existing test, the grid division by the X-method is simpler, namely, the straight ruler is used for respectively and crossly dividing the grid in the diagonal direction of the test board and penetrating the grid, and then an adhesive tape which meets the standard is pasted on the surface of the grid division and is torn at a certain angle to observe the adhesive force strength of the surface coating; the method and tool for adhering adhesive force by using the method are mainly a lattice plate or a lattice knife, and the method and tool are characterized in that a coating is made into a lattice pattern by using a tool with a certain specification, the lattice pattern is cut and penetrated, 100 square lattice patterns are formed by transverse and longitudinal cutting, an adhesive tape which meets the standard is attached to the surface of a scribed lattice, the adhesive force strength of the surface coating is observed by tearing the adhesive tape at a certain angle, and the classification is carried out according to the falling severity of the coating. In the two grid dividing methods, after the grid division is finished, the adhesive tape meeting the standard is used for adhering and tearing the surface of the grid dividing position, the tearing angle is regulated, the tearing angle is different, and the falling condition and the severity of the coating are different.

However, when the tape is actually torn, due to the difference between different experimenters, equipment and environments, the tearing angle and the fixing condition of the test board and the adhesive tape are different, and the following problems exist when the existing detection instrument and equipment are used:

firstly, the tearing angle is not accurate, for example, ASTM D3359-B requires that the tearing angle is 180 degrees, but an operator tears at 160 degrees or 150 degrees, the tearing force borne by a paint film at a grid part is different from the standard requirement, and in GB/T9286 and ISO2409 standards, after the adhesive tape is pasted, the tearing force angle is required to be 60 degrees, in the actual operation, the accurate judgment of 60 degrees is a difficult problem, and the operator difficultly judges 60 degrees accurately by means of subjective feeling;

secondly, the repeatability and the reproducibility are poor, and based on the reason of the first problem, when repeated testing and reproduction testing are carried out, the testing results of testers and/or the same tester in different time periods are influenced by angles and changed;

thirdly, the convenience is not good, and during the test, the sticky tape is pasted with the abundant contact of the coating of being lacerated, often can tear the test panel together when tearing, and the removal of test panel will lead to the failure of this test.

Disclosure of Invention

The invention aims to provide a coating adhesion testing device with a controllable pulling angle, and aims to solve the problems that the pulling angle of a measuring adhesive tape is inaccurate and the pulling angle is unstable when a coating adhesion test is performed in the prior art.

In order to achieve the above purpose, the basic scheme of the invention is as follows:

the base is fixedly connected with a fixing piece to be detected, and an adhesive tape directional supporting unit is arranged on the base, a through hole for allowing a measuring adhesive tape to pass through is formed in the base along the thickness direction of the base, and the adhesive tape directional supporting unit comprises an angle measurer for determining the inclination angle of the measuring adhesive tape and a supporting frame for keeping the inclination angle of the measuring adhesive tape.

The principle and the beneficial effects of the basic scheme of the coating adhesion testing device with the controllable pulling angle are as follows:

the method comprises the steps of marking grids in a region to be measured on the surface to be measured of a piece to be measured, well bonding a measuring adhesive tape with the surface of the region to be measured of the piece to be measured, leaving a margin for drawing at the tail end of the measuring adhesive tape, adjusting an angle measurer to a specified measuring angle, enabling the tail end of the measuring adhesive tape to penetrate through a through groove in a base, adjusting an inclination angle of the tail end of the measuring adhesive tape to a specified angle by using the angle measurer, keeping the inclination angle of the measuring adhesive tape by using a supporting frame, fixedly connecting the base with the piece to be measured by using a fixing piece, and drawing the measuring adhesive tape from the tail end of the measuring adhesive tape to the inclination direction of the measuring adhesive tape to measure the film coating adhesive force.

In the process of measuring the adhesive tape by drawing, the support frame keeps the inclination angle of the measuring adhesive tape, so that the inclination angle of the measuring adhesive tape can not be changed due to the change of the drawing direction of a measurer, the measuring process of the adhesive force is standardized, the measuring error is reduced, and the measuring accuracy is improved.

Further, the angle measurer comprises a fixed plate and a movable plate, wherein the fixed plate is horizontally arranged, the movable plate is rotatably connected with the fixed plate, the fixed plate and the movable plate are both in a U-shaped plate shape, the opening end of the fixed plate and the opening end of the movable plate are oppositely arranged, the fixed plate is arranged on the upper surface of the base and fixedly connected with the base, the open end of the fixed plate is located above the passing hole, first rotating shafts are horizontally and coaxially arranged between two side plates of the open end of the fixed plate and two side plates of the open end of the movable plate, the fixed plate and the movable plate are rotatably connected through the two first rotating shafts which are coaxially arranged, the outer side of the fixed plate is fixedly connected with a reading plate used for reading the angle of the movable plate rotating around the first rotating shafts, and after the movable plate is turned over to enable the movable plate to rotate around the first rotating shafts for a certain angle, the reading of the included angle between the movable plate and the surface of the base can be read from the reading plate.

Further, the support frame comprises two support plates which are arranged in parallel and are respectively rotatably connected with first rotating shafts on two sides of the fixed plate and a connecting plate which fixedly connects the two support plates, when the support plates and the movable plate rotate around the first rotating shafts at the same angle, the front end surfaces of the support plates are coplanar with the upper surface of the movable plate, one ends of the support plates, far away from the first rotating shaft, are parallelly provided with connecting shafts, the connecting shafts are horizontally arranged, two ends of the connecting shafts are respectively rotatably connected with the two support plates, a gap for allowing the measuring adhesive tape to pass is formed between the two connecting shafts, the gap is coplanar with the front end surfaces of the support plates, the upper surface of the base is horizontally provided with a first sliding groove along the direction vertical to the axis of the first rotating shaft, a threaded rod is horizontally arranged in the sliding groove along the length direction of the first sliding groove, and one end of the threaded rod is rotatably connected with the base, the other end of the threaded rod extends out of the base, a nut seat is connected on the threaded rod in a threaded manner, a second sliding groove is arranged on the two side walls of the first sliding groove along the length direction of the first sliding groove, a second sliding plate matched with the second sliding groove is fixed on both sides of the side wall of the nut seat close to the first sliding groove, a push rod is arranged on the nut seat, one end of the push rod is hinged with the nut seat, the other end of the push rod is hinged with the connecting plate, when the threaded rod is rotated, the nut seat is driven by the thread to move on the threaded rod, when the nut seat moves towards the direction close to the movable plate, the push rod hinged with the nut seat pushes the support plate to rotate around the first rotating shaft, when the supporting plate rotates to a certain angle with the base and the threaded rod is not rotated any more, 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, so that the supporting plate is kept fixed.

Further, in order to enable the movable plate to stay still after rotating any angle so as to conveniently read the rotating angle of the movable plate, the first rotating shaft is a damping rotating shaft.

Further, the fixing piece is one or more of a binding band, a screw, a caliper or a powerful magnet.

Furthermore, in order to facilitate the rotation of the threaded rod, a hand wheel is fixedly connected at one end of the threaded rod extending out of the base.

Drawings

Fig. 1 is a schematic view of the structure of the present invention in the front view direction.

Fig. 2 is a schematic view of the structure of the movable plate and the supporting plate in a top view.

Fig. 3 is a schematic view of a structure in a front view direction when the upper surface of the movable plate is attached to the measuring tape.

Fig. 4 is a schematic view of the structure in the front view direction when the movable plate is turned over and laid flat.

Fig. 5 is a schematic structural view of the first chute.

Detailed Description

The following is further detailed by way of specific embodiments:

reference numerals in the drawings of the specification include: the device comprises a to-be-detected piece 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 supporting plate 401, a connecting plate 402, a connecting shaft 403, a gap 404, a first sliding groove 405, a threaded rod 406, a nut seat 407, a second sliding groove 408, a second sliding plate 409, a push rod 501, a measuring tape 60 and a handle 70.

Example 1

The coating adhesion testing device with the controllable pulling angle comprises a base 20, a fixing piece and a tape directional supporting unit, wherein the fixing piece is used for fixedly connecting the base 20 with a piece to be tested 10, the tape directional supporting unit is arranged on the base 20, the fixing piece is one or more of a binding band, a screw or a caliper, the binding band is preferably selected in the embodiment, a passing hole 201 for allowing a measuring tape 60 to pass through is formed in the base 20 along the thickness direction of the base 20, and the tape directional supporting unit comprises an angle measurer for determining the inclination angle of the measuring tape 60 and a supporting frame for keeping the inclination angle of the measuring tape 60.

As shown in fig. 1 and 2, the angle measuring device includes a fixed plate 301 horizontally disposed 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, an open end of the fixed plate 301 is opposite to an open end of the movable plate 302, the fixed plate 301 is disposed 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 through hole 201, a first rotating shaft 303 is horizontally and coaxially disposed between two side plates of the open end of the fixed plate 301 and two side plates of the open end of the movable plate 302, in order to enable the movable plate 302 to stay stationary after rotating any angle, the first rotating shaft 303 is a damping rotating shaft, the fixed plate 301 and the movable plate 302 are rotatably connected through the two coaxially disposed first rotating shafts 303, a reading plate 304 is fixedly connected to the outer side of the fixed plate 301, and scale lines and corresponding degree marks are engraved on the reading plate 304 for measuring the turning angle of the movable plate 302, when the movable plate 302 is turned over to rotate the movable plate 302 around the first rotation axis 303 by a certain angle, the upper surface of the movable plate 302 rotates to be aligned and coplanar with a certain scale on the reading plate 304, and the reading mark corresponding to the scale is the included angle between the movable plate 302 and the base 20.

As shown in fig. 1 and 2, the supporting frame comprises two supporting plates 401 arranged in parallel, one end of one supporting plate 401 is rotatably connected with the first rotating shaft 303 on one side of the fixed plate 301, one end of the other supporting plate 401 is rotatably connected with the first rotating shaft 303 on the other side of the fixed plate 301, a connecting plate 402 is horizontally arranged between the two supporting plates 401, one end of the connecting plate 402 is fixedly connected with one supporting plate 401, the other end of the connecting plate 402 is fixedly connected with the other supporting plate 401, a hinge base is fixedly connected with the middle part of the connecting plate 402, when the supporting plate 401 and the movable plate 302 rotate around the first rotating shaft 303 at the same angle, the front end surface of the supporting plate 401 is coplanar with the upper surface of the movable plate 302, one end of the supporting plate 401 far away from the first rotating shaft 303 is provided with two connecting shafts 403 which are parallel to each other, the connecting shaft 403 is horizontally arranged, one end of the connecting shaft 403 is rotatably connected with one supporting plate 401, and the other end of the connecting shaft 403 is rotatably connected with the other supporting plate 401, a gap is left between the two connecting shafts 403 to form a gap 404 for the measuring tape 60 to pass through, and the gap 404 is coplanar with the front end face of the supporting plate 401.

Referring to fig. 1, 2 and 5, a first sliding groove 405 is horizontally disposed 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 disposed in the first sliding groove 405 along the length direction of the first sliding groove 405, one end of the threaded rod 406 is rotatably connected to the base 20, the other end of the threaded rod 406 extends out of the base 20, one end of the threaded rod 406 extending out of the base 20 is fixedly connected to a hand wheel facilitating rotation of the threaded rod 406, a nut seat 407 is connected to the threaded rod 406, an hinge seat is fixedly connected to the upper surface of the nut seat 407, second sliding grooves 408 are disposed on the two side walls of the first sliding groove 405 along the length direction of the first sliding groove 405, second sliding plates 409 are integrally formed with the two sides of the side wall of the nut seat 407, the second sliding plates 409 are horizontally disposed, one end of the second sliding plates 409 far from the nut seat 407 is disposed in the second sliding grooves 408 and slidably engaged with the second sliding grooves 408, the nut seat 407 is provided with a push rod 501, one end of the push rod 501 is hinged with the hinged support on the nut seat 407, and the other end of the push rod 501 is hinged with the hinged support on the connecting plate 402.

When the device is used specifically, a grid is scribed in a region to be measured of the surface to be measured of the piece to be measured 10, the measuring adhesive tape 60 is well bonded with the surface of the region to be measured of the piece to be measured 10, after the measuring adhesive tape 60 is bonded, the movable plate 302 is rotated around the first rotating shaft 303 to be turned over and adjusted to be aligned with a scale line of a specified angle on the reading plate 304, and the turning angle of the movable plate 302 is kept unchanged under the damping of the first rotating shaft 303;

rotating the handle 70 to move the nut seat 407 along the threaded rod 406 toward the movable plate 302, the nut seat 407 via the push rod 501 causes the supporting plate 401 to turn around the first rotating shaft 303, and the handwheel is stopped rotating when the front end surface of the supporting plate 401 is coplanar with the upper surface of the movable plate 302;

as shown in fig. 1, the end of the measuring tape 60 passes through the passing hole 201 and then passes through the gap 404 between the two connecting shafts 403, so that the measuring tape 60 keeps a certain tension in a flat state;

as shown in fig. 3, the base 20 is moved to make the upper surface of the movable plate 302 and the measuring tape 60 be arranged in a coplanar manner, so as to keep the base 20 stationary, and the base 20 and the object 10 to be measured are fixedly connected by using a binding band or a screw;

as shown in fig. 4, rotating the movable plate 302 away from the measuring tape 60 prevents the measuring tape 60 from adhering to the movable plate 302 and affecting the pulling of the measuring tape 60, and the measuring tape 60 is pulled in the extending direction of the end of the measuring tape 60 for measurement.

Because the nut seat 407 has a self-locking function on the threaded rod 406, the nut seat 407 cannot move on the threaded rod 406 without rotating the threaded rod 406, and 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, after the base 20 and the to-be-measured element 10 are fixedly connected by a fixing element, the adjusted angle of the support plate 401 remains unchanged, and 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 also kept unchanged by the limitation of the two connecting shafts 403, so that the measuring accuracy is improved.

When the base 20 is moved to make the upper surface of the movable plate 302 be coplanar with the measuring tape 60, the inclination of the measuring tape 60 is the same as the inclination of the movable plate 302, the measuring tape 60 can precisely define the inclination, and after the inclination of the measuring tape 60 is set, 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 to affect the measuring result when the measuring tape 60 is pulled.

The above are merely examples of the present invention, and common general knowledge of known specific structures and characteristics in the schemes is not described herein. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several variations and modifications can be made, which should also be considered as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the utility of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.

Claims

1. The utility model provides a coating adhesive force testing arrangement of controllable tractive angle which characterized in that: the base is fixedly connected with a fixing piece of a piece to be measured and a tape orientation supporting unit arranged on the base, a passing hole for allowing a measuring tape to pass through is formed in the base along the thickness direction of the base, and the tape orientation supporting unit comprises an angle measurer for determining the inclination angle of the measuring tape and a supporting frame for keeping the inclination angle of the measuring tape.

2. The device for testing the adhesion of the coating film with a controllable pulling angle according to claim 1, is characterized in that: the angle measurer comprises a fixed plate and a movable plate, wherein the fixed plate is arranged on the upper surface of a base on average, the movable plate is rotatably connected with the fixed plate, the fixed plate and the movable plate are both in a U-shaped plate shape, the opening end of the fixed plate is opposite to the opening end of the movable plate, the fixed plate is fixedly connected with the base, the opening end of the fixed plate is located above the passing hole, a first rotating shaft is horizontally and coaxially arranged between two side plates of the opening end of the fixed plate and two side plates of the opening end of the movable plate, and the outer side of the fixed plate is fixedly connected with a reading plate used for reading the angle of the movable plate rotating around the first rotating shaft.

3. The coating adhesion testing device with the controllable pulling angle as claimed in claim 2, wherein: the support frame comprises two support plates which are arranged in parallel and are respectively rotatably connected with first rotating shafts on two sides of a fixed plate and a connecting plate which fixedly connects the two support plates, when the support plates and the movable plate rotate around the first rotating shafts at the same angle, the front end surfaces of the support plates are coplanar with the upper surfaces of the movable plates, one ends of the support plates, far away from the first rotating shafts, are parallelly provided with connecting shafts, the connecting shafts are horizontally arranged, two ends of the connecting shafts are respectively rotatably connected with the two support plates, a gap for allowing the measuring adhesive tape to pass is formed between the two connecting shafts, the gap is coplanar with the front end surfaces of the support plates, the upper surface of the base is horizontally provided with a first sliding groove along the direction vertical to the axis of the first rotating shaft, a threaded rod is horizontally arranged in the first sliding groove along the length direction of the first sliding groove, and one end of the threaded rod is rotatably connected with the base, the other end of the threaded rod stretches out of the base, a nut seat is connected to the threaded rod in a threaded mode, second sliding grooves are formed in the two side walls of the first sliding grooves along the length direction of the first sliding grooves, the two sides of the side wall, close to the first sliding grooves, of the nut seat are fixedly connected with a second sliding plate matched with the second sliding grooves, 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.

4. The coating adhesion testing device with the controllable pulling angle according to claim 3, characterized in that: the first rotating shaft is a damping rotating shaft.

5. The device for testing the adhesion of the coating film with the controllable pulling angle according to claim 4, is characterized in that: the fixing piece is one or more of a binding band, a screw, a caliper or a powerful magnet.

6. The coating adhesion testing device with the controllable pulling angle of claim 5, wherein: and one end of the threaded rod extending out of the base is fixedly connected with a hand wheel.