Automobile coating adhesion performance testing machine and testing method

Abstract

The present invention relates to the field of automobile paint testing technology, specifically to an automobile paint adhesion performance testing machine and testing method, including a base, a limit block for limiting the sample is fixedly installed on the upper end surface of the base, a shaped frame located above the limit block is fixedly installed on the upper end surface of the base, and a pressing mechanism is arranged on the shaped frame. An integrated operation model of limiting, cutting and adhering is adopted to complete the hundred-grid test of different spacings of the automobile paint sample, realizing an efficient, accurate and standardized testing process, unified pressure control ensures that the cutting depth and force of grids with different spacings on the sample surface are consistent to avoid damaging the substrate, cross-shaped limiting and synchronous cutting greatly improve the testing efficiency, ensure that each grid angle is accurately 90 degrees, and at the same time, only the pressure needs to be adjusted to easily cope with coatings of different hardness and thickness, and the automated adhesion and tape removal process significantly enhances the operation consistency, comprehensively improving the testing quality and efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive paint testing, and particularly to a testing machine and a testing method for the adhesion performance of automotive paint. Background Art

[0002] Automotive paint is a special paint used for coating the surface of automobiles, aiming to provide an aesthetic appearance and protect the substrate from environmental impacts, so as to enhance the durability and corrosion resistance of automobiles. In order to ensure that the automotive paint can remain on the surface of the automobile for a long time and there will be no paint blistering, peeling or cracking, it is necessary to test the adhesion performance of the automotive paint before use to ensure that the automotive paint will not fall off easily. The cross-cut test method is one of the common methods for evaluating the adhesion of automotive paint. It mainly judges whether the adhesion of the paint meets the quality requirements quickly by scratching a grid pattern on the surface of the sample coating and evaluating the peeling situation, so as to ensure the durability and quality of the coating.

[0003] However, there are the following disadvantages in testing the adhesion performance of automotive paint by the current cross-cut method: 1. When performing the cross-cut test on the sample coating, workers need to hold the cross-cut tool perpendicular to the plane of the sample and make a cut, then rotate the sample 90 degrees, repeat the above operation on the cut incision to form cross grids with different spacings, then use tape to stick on the entire cut area, and press it with fingers to ensure full contact between the tape and the coating, and then quickly tear up the tape to observe the peeling situation of the grid. In the above operation process, manual participation is required throughout the test. There may be differences in skills and experience among different operators, resulting in inconsistent test results. And the time-consuming manual operation limits the batch processing ability of the test, making the test efficiency low; 2. When performing the cross-cut test, it is impossible to ensure that the cutting force of the workers on the sample coating is exactly the same each time, resulting in uneven cutting depth of the sample coating, thus affecting the separation degree between the coating and the substrate, leading to inaccurate test results. And it is difficult to ensure an accurate 90-degree angle between the trace of the second cut and the first trace, resulting in inconsistent shapes and sizes of the grid cells, further affecting the accuracy of the evaluation. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a testing machine and a testing method for the adhesion performance of automotive paint, which are achieved by the following specific technical means: A testing machine for the adhesion performance of automotive paint, including a base, a limiting block for limiting the sample is fixedly installed on the upper end surface of the base, a U-shaped frame located above the limiting block is fixedly installed on the upper end surface of the base, a pressing mechanism is arranged on the U-shaped frame, and a testing mechanism for cooperating with the pressing mechanism to synchronously cut a plurality of grids with different spacings on the surface of the sample is arranged on the pressing mechanism.

[0005] The pressing mechanism includes a driving part arranged on the mold frame and used to provide uniform pressure for the testing mechanism, and the driving part is provided with an extrusion part for pressing the sample downward; the testing mechanism includes an execution part arranged on the driving part, and the driving part is also provided with a matching part for cooperating with the execution part to convert the cutting direction and a limiting part for implementing a cross-shaped limit on the cutting direction of the execution part.

[0006] The base is provided with an adhesion mechanism cooperating with the testing mechanism; the adhesion mechanism includes a glue sticking part arranged on the base, the glue sticking part is provided with a moving part for cooperating with it to stick the tape to the surface of the sample after cutting by the testing mechanism, and the moving part is provided with an unlocking part for cooperating with it to quickly tear off the tape.

[0007] As a preferred technical solution of the present invention, the driving part includes a cylinder, a triangular plate and an equipment plate. The cylinder is fixedly installed on the upper end surface of the shaped frame, the telescopic end of the cylinder is fixedly installed with a triangular plate located between the shaped frame and the base, and the lower end surface of the triangular plate is fixedly installed with an equipment plate with a cavity inside through a support rod.

[0008] As a preferred technical solution of the present invention, the extrusion part includes an extrusion plate, and the lower end surface of the equipment plate is fixedly mounted with a front-to-back symmetrical extrusion plate through a support rod, and the outer surface of the extrusion plate is covered with a rubber layer.

[0009] As a preferred technical solution of the present invention, the execution part includes a first turntable, a limiting groove, a limiting slider, a knife seat, a cutter and a connecting rod. The lower end surface of the equipment plate is penetrated by three first turntables in a linear array from front to back through bearings. The lower end surface of the first turntable is penetrated by a limiting groove, and a limiting slider is slidably installed in the limiting groove. A spring is fixedly installed between the limiting slider and the limiting groove. The knife seat is fixedly installed on the lower end surface of the limiting slider, and the cutter is fixedly installed on the lower end of the knife seat. The blade spacing of the three cutters decreases from front to back, and a connecting rod is fixedly installed on the upper end surface of the limiting slider.

[0010] As a preferred technical solution of the present invention, the limiting part includes a limiting plate and a cross-shaped slide. A limiting plate corresponding to the first turntable is fixedly installed on the upper end surface of the equipment plate, and a cross-shaped slide is opened on the limiting plate. The upper end of the connecting rod passes through the corresponding cross-shaped slide and is slidably connected to it.

[0011] As a preferred technical solution of the present invention, the matching part includes a second turntable, a first motor, an electric push rod, an L-shaped plate and an arc-shaped slideway. The three first turntables are connected by a first belt transmission. A second turntable located just to the right of a middle first turntable is installed on the upper end surface of the equipment plate through a bearing. The second turntable and the corresponding first turntable are connected by a first gear set. A first motor is fixedly installed in the equipment plate. The output end of the first motor is connected to the second turntable by a second gear set. An L-shaped plate located between the triangular plate and the equipment plate is commonly provided at the upper ends of the three connecting rods. The L-shaped plate is connected to the connecting rod by a bearing. An arc-shaped slideway coaxial with the second turntable is provided on one side of the L-shaped plate close to the second turntable. An electric push rod is fixedly installed on the upper end surface of the second turntable. A matching slider hinged to the telescopic end of the electric push rod is slidably installed in the arc-shaped slideway.

[0012] As a preferred technical solution of the present invention, the glue-applying part includes a slide rail, a support slider, a rolling roller, a fixed column and a protrusion. The upper end surface of the base is provided with a left-right symmetrical slide rail, and a support slider is slidably installed in the slide rail. A rolling roller is rotatably installed between the left-right symmetrical support sliders through an arranged shaft rod. A fixed column located above the rolling roller and used to fix the tape roll is fixedly installed between the left-right symmetrical support sliders. A protrusion is fixedly installed on the support slider located on the right side, and a first sliding hole is provided on the protrusion, which runs through the front and rear end surfaces thereof, and a second sliding hole connected to the first sliding hole is also provided on the upper end surface of the protrusion.

[0013] As a preferred technical solution of the present invention, the moving part includes a matching rod, a second motor, an insertion rod, a positioning block and a positioning groove, the upper end surface of the base is rotatably installed with a matching rod with a spiral groove on the outer ring wall by setting a front-to-back symmetrical bearing seat, the matching rod movably passes through the first sliding hole, and a tension spring sleeved on the matching rod is fixedly installed between the protrusion and the bearing seat on the front side, the upper end surface of the base is fixedly installed with a second motor whose output end is fixedly connected to the matching rod, the insertion rod is slidably installed in the second sliding hole, the ball bearing arranged at the lower end of the insertion rod cooperates with the spiral groove of the matching rod, the upper end of the insertion rod is fixedly installed with a matching circular plate, and a plurality of positioning blocks are fixedly installed on the outer ring wall of the lower end of the insertion rod in a circular array manner, and an upper and lower groups of positioning grooves are opened on the inner ring wall of the second sliding hole, and the positioning blocks correspond to the positioning grooves one by one, and the positioning blocks are clamped with the positioning grooves, and the positioning blocks are made of rubber.

[0014] As a preferred technical solution of the present invention, the unlocking part includes a matching plate, which is fixedly installed on the bearing seat on the rear side with a left-right symmetrical matching plate, and the matching plate is composed of a triangular block plate in the front and a rectangular plate in the rear, and the matching plate matches the insertion rod.

[0015] As a preferred technical solution of the present invention, the present invention also provides a testing method using the above-mentioned automobile paint adhesion performance testing machine, and the specific testing method includes the following steps: S1: Preparation: Place the sample to be tested between the limit blocks, and ensure that the surface of the sample is clean, dry, and free of dust or oil.

[0016] S2: Cutting grid: The cutting knife is made perpendicular to the plane of the test piece by cooperating with the pressing mechanism and the testing mechanism, and cutting is performed with uniform pressure and speed to form multiple cross grids.

[0017] S3: Clean the surface: Use a soft-bristled brush to gently brush the grid diagonally back and forth to remove loose debris so that the experimental results can be observed more accurately.

[0018] S4: Adhesive tape: Select a tape that meets the standards, apply the tape to the entire grid area through the adhesive mechanism, and ensure that the tape is in full contact with the coating, then quickly tear off the tape.

[0019] S5: Observational evaluation: Use a magnifying glass to carefully inspect the grid area, record the paint film peeling situation, and score according to the preset standard grade.

[0020] S6: Subsequent processing: After the test is completed, clean the test area and repair it if necessary.

[0021] Compared with the prior art, the present invention has the following beneficial effects: 1. The automobile paint adhesion performance testing machine and testing method, through the coordinated use of the set pressing mechanism, the testing mechanism and the adhesion mechanism, adopts an integrated operation model of limiting, cutting and adhesion to complete the hundred-grid test of different spacings on the automobile paint sample, so as to realize efficient, accurate and standardized testing process, and unified pressure control to ensure the consistency of cutting depth and force of grids with different spacings on the sample surface, reduce human errors, and avoid damage to the substrate, cross-type limiting and synchronous cutting greatly improve the testing efficiency, ensure that each grid angle is accurately 90 degrees, improve the accuracy and reliability of the results, and at the same time, only need to adjust the pressure to easily cope with coatings of different hardness and thickness, and the automated adhesion and tape removal process makes the operation consistency significantly enhanced, and comprehensively improves the testing quality and efficiency.

[0022] 2. The automobile paint adhesion performance testing machine and testing method, through the coordinated use of the set down-pressing mechanism and the testing mechanism, can use uniform pressure to complete the cutting of multiple grids with different spacings on the sample surface, so as to ensure that the depth and strength of each cutting are consistent, greatly reducing the error caused by human operation, and the cutting quality of grids with different spacings is more uniform. At the same time, the uniform control of pressure can ensure that the cutting depth just reaches the coating without damaging the substrate.

[0023] 3. The automobile paint adhesion performance tester and test method can synchronously complete the cutting of grids with different spacings through the set test mechanism, greatly reducing the operation time and improving the test efficiency. During the cutting process, a cross-shaped limit is implemented on the moving direction of the cutter to ensure that the cutter moves in directions perpendicular to each other, so that the angle of each grid is accurately 90 degrees, thereby improving the accuracy of the test. Through mechanical limit and synchronous control, the angle and force errors caused by manual operation are reduced, making the test results more consistent.

[0024] 4. The automobile paint adhesion performance tester and test method can automatically adhere the tape to the surface of the cut sample through the set adhesion mechanism, ensuring that the contact between the tape and the sample surface is more uniform and complete, and when moving to the matching plate, the tape is quickly torn off in cooperation with the matching plate, thereby ensuring that the force and angle of each operation are consistent, making the test operation more standardized and improving the consistency of the results. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention when it is working.

[0026] Figure 2 It is a three-dimensional structural schematic diagram of the pressing mechanism of the present invention.

[0027] Figure 3 It is a bottom-up stereoscopic structural schematic diagram of the testing mechanism of the present invention.

[0028] Figure 4 It is a partial three-dimensional structural schematic diagram of the matching part of the present invention.

[0029] Figure 5 It is a schematic diagram of the three-dimensional structure of the limiting part of the present invention.

[0030] Figure 6 It is a partial cross-sectional three-dimensional structural schematic diagram of the execution part of the present invention.

[0031] Figure 7 It is a schematic diagram of the three-dimensional structure of the adhesion mechanism of the present invention.

[0032] Figure 8 for Figure 7 Schematic diagram of the enlarged structure at point A in the middle.

[0033] In the figure: 1, base; 2, limit block; 3, mold frame; 4, pressing mechanism; 41, driving part; 411, cylinder; 412, triangle plate; 413, equipment plate; 42, extrusion part; 421, extrusion plate; 5, testing mechanism; 51, execution part; 511, first turntable; 512, limit slide; 513, limit slide block; 514, knife seat; 515, cutter; 516, connecting rod; 52, matching part; 521, second turntable; 522, first motor; 523 , electric push rod; 524, special L-shaped plate; 525, arc-shaped slide; 53, limiting part; 531, limiting plate; 532, cross-shaped slide; 6, adhesion mechanism; 61, gluing part; 611, slide rail; 612, supporting slider; 613, rolling roller; 614, fixing column; 615, bump; 62, moving part; 621, matching rod; 622, second motor; 623, insertion rod; 624, positioning block; 625, positioning groove; 63, unlocking part; 631, matching plate. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] See also Figure 1 A car paint adhesion performance testing machine includes a base 1, a limit block 2 for limiting the position of a sample is fixedly installed on the upper end surface of the base 1, a mold frame 3 located above the limit block 2 is fixedly installed on the upper end surface of the base 1, a pressing mechanism 4 is arranged on the mold frame 3, and a testing mechanism 5 for cooperating with it to synchronously cut a plurality of grids with different spacings on the surface of the sample is arranged on the pressing mechanism 4.

[0036] See also Figure 1 The pressing mechanism 4 includes a driving part 41 which is arranged on the mold frame 3 and is used to provide a uniform pressure to the testing mechanism 5. The driving part 41 is provided with a pressing part 42 for pressing the sample downward.

[0037] See also Figure 1 The testing mechanism 5 includes an executing part 51 arranged on the driving part 41, and the driving part 41 is also provided with a matching part 52 for cooperating with the executing part 51 to change the cutting direction and a limiting part 53 for implementing a cross-shaped limit on the cutting direction of the executing part 51.

[0038] See also Figure 1The base 1 is provided with an adhesion mechanism 6 that cooperates with the testing mechanism 5; the adhesion mechanism 6 includes a glue sticking portion 61 arranged on the base 1, and the glue sticking portion 61 is provided with a moving portion 62 for cooperating therewith to stick the tape to the surface of the sample cut by the testing mechanism 5, and the moving portion 62 is provided with an unlocking portion 63 for cooperating therewith to quickly tear off the tape.

[0039] See also Figure 1 and Figure 2 The driving part 41 includes a cylinder 411, a triangular plate 412 and an equipment plate 413. The cylinder 411 is fixedly installed on the upper end surface of the mold frame 3. The telescopic end of the cylinder 411 is fixedly installed with a triangular plate 412 located between the mold frame 3 and the base 1. The lower end surface of the triangular plate 412 is fixedly installed with an equipment plate 413 with a cavity inside through a set support rod.

[0040] See also Figure 3 The extrusion part 42 includes an extrusion plate 421. The lower end surface of the equipment plate 413 is fixedly mounted with a front-to-back symmetrical extrusion plate 421 through a support rod. The outer surface of the extrusion plate 421 is covered with a rubber layer.

[0041] See also Figure 1 , Figure 3 , Figure 5 and Figure 6 The execution part 51 includes a first turntable 511, a limiting slide groove 512, a limiting slider 513, a knife seat 514, a cutter 515 and a connecting rod 516. The lower end surface of the equipment plate 413 is penetrated by three first turntables 511 in a linear array from front to back through a bearing. The lower end surface of the first turntable 511 is penetrated by a limiting slide groove 512. The limiting slider 513 is slidably installed in the limiting slide groove 512. A spring is fixedly installed between the limiting slider 513 and the limiting slide groove 512. The knife seat 514 is fixedly installed on the lower end surface of the limiting slider 513. The cutter 515 is fixedly installed at the lower end of the knife seat 514. The blade spacing of the three cutters 515 decreases from front to back. The upper end surface of the limiting slider 513 is fixedly installed with a connecting rod 516.

[0042] During specific work, when it is necessary to conduct a hundred-grid test on the automobile paint sample, the sample is placed between the limit blocks 2, and then the cylinder 411 is started to make it descend with the equipment plate 413 through the triangular plate 412, and when the extrusion plate 421 contacts the upper end surface of the sample, the cylinder 411 is stopped. At this time, the equipment plate 413 will press the sample on the base 1 through the extrusion plate 421, thereby fixing the sample on the upper end surface of the base 1. At the same time, the blades of the lower ends of the three cutters 515 will simultaneously cut into the automobile paint layer of the sample. Therefore, when the test mechanism 5 is testing, a uniform pressure can be used to complete the cutting of multiple grids with different spacings on the surface of the sample to ensure that the depth and strength of each cutting are consistent.

[0043] See also Figure 1 , Figure 4 and Figure 5 The limiting portion 53 includes a limiting plate 531 and a cross-shaped slide 532. The upper end surface of the equipment plate 413 is fixedly penetrated with a limiting plate 531 corresponding to the first turntable 511. A cross-shaped slide 532 is penetrated on the limiting plate 531. The upper end of the connecting rod 516 penetrates the corresponding cross-shaped slide 532 and is slidably connected thereto.

[0044] See also Figure 1 , Figure 3 , Figure 4 , Figure 5 and Figure 6 The matching part 52 includes a second turntable 521, a first motor 522, an electric push rod 523, an L-shaped plate 524 and an arc slide 525. The three first turntables 511 are connected by a first belt transmission. The upper end surface of the equipment plate 413 is penetrated by a bearing and is installed with a second turntable 521 located to the right of the middle first turntable 511. The second turntable 521 is connected to the corresponding first turntable 511 by a first gear set. The first motor 522 is fixedly installed in the equipment plate 413. The output end of the first motor 522 is connected to the first The two turntables 521 are connected by a second gear set, and an L-shaped plate 524 located between the triangular plate 412 and the equipment plate 413 is commonly provided at the upper ends of the three connecting rods 516. The L-shaped plate 524 is connected to the connecting rod 516 through a bearing, and an arc-shaped slideway 525 coaxial with the second turntable 521 is provided on one side of the L-shaped plate 524 close to the second turntable 521. An electric push rod 523 is fixedly installed on the upper end surface of the second turntable 521, and a matching slider hinged to the telescopic end of the electric push rod 523 is slidably installed in the arc-shaped slideway 525.

[0045] During specific operation, before the pressing mechanism 4 makes the cutter 515 contact the template, the limiting slide groove 512 is in a horizontal state facing forward and backward, and the limiting slider 513 is located in the middle of the limiting slide groove 512 under the action of the spring, and is also located at the axis of the first turntable 511, and the matching slider is located at the rightmost side of the arc slide 525. Then, the electric push rod 523 is started in reverse to retract its telescopic end, thereby pulling the L-shaped plate 524 forward through the matching slider, and making the limiting slider 513 slide to the front end of the limiting slide groove 512.

[0046] At this time, the device plate 413 can be lowered through the driving part 41 so that the cutter 515 contacts the template, and then the electric push rod 523 is started in the positive direction to push the L-shaped plate 524 backward, so that the three cutters 515 move backward synchronously through the connecting rod 516, so that the cutter 515 performs the first gridding operation on the corresponding position of the upper end surface of the template.

[0047] Then, the cylinder 411 is started in reverse to lift the cutter 515 away from the template, and the electric push rod 523 is started in reverse to make the limit slider 513 return to the axis of the first turntable 511, and then the first motor 522 is started to rotate the second turntable 521 ninety degrees through the second gear set, and the second turntable 521 will rotate the first turntable 511 ninety degrees through the first gear set, and all the first turntables 511 will be synchronously rotated ninety degrees through the first belt, so that the limit slide 512 is in a horizontal state facing left and right.

[0048] Because the connecting rod 516 is located at the axis of the first turntable 511, the position of the L-shaped plate 524 does not change, and the electric push rod 523 rotates the matching slider to the leftmost side of the arc-shaped slide 525 under the rotation of the second turntable 521, and then the electric push rod 523 is started in reverse to pull the L-shaped plate 524 to the right, so that the limit slider 513 is located at the rightmost end of the limit slide groove 512 at this time.

[0049] Subsequently, the cutter 515 is brought into contact with the sample again through the driving unit 41, and then the electric push rod 523 is started to push the L-shaped plate 524 to the left, thereby driving the cutter 515 to perform a second gridding operation on the corresponding position of the upper end surface of the sample, thereby completing the grid cutting operation on the sample, thereby simultaneously completing the cutting of grids with different spacings, greatly reducing the operation time and improving the test efficiency.

[0050] Then, the cutter 515 is lifted up and separated from the template through the driving unit 41, and the electric push rod 523 is started in the reverse direction to return the limit slider 513 to the axis center of the first turntable 511 again, so as to prepare for the next cutting operation.

[0051] When the cutter 515 is cutting a grid, the connecting rod 516 always slides in the cross-shaped slide 532 of the limiting plate 531, thereby implementing a cross-shaped limit on the moving direction of the cutter 515 during the cutting process to ensure that the cutter 515 moves in directions perpendicular to each other, so that the angle of each grid is accurately 90 degrees, thereby improving the accuracy of the test.

[0052] See also Figure 1 , Figure 2 , Figure 7 and Figure 8The adhesive laminating part 61 comprises a slide rail 611, a support slider 612, a rolling roller 613, a fixed column 614 and a protrusion 615. The upper end surface of the base 1 is provided with a left-right symmetrical slide rail 611, and a support slider 612 is slidably installed in the slide rail 611. The rolling roller 613 is rotatably installed between the left-right symmetrical support sliders 612 through an arranged shaft rod. A fixed column 614 located above the rolling roller 613 and used for fixing the tape roll is fixedly installed between the left-right symmetrical support sliders 612. A protrusion 615 is fixedly installed on the support slider 612 located on the right side. The protrusion 615 is provided with a first sliding hole that runs through the front and rear end surfaces thereof, and the upper end surface of the protrusion 615 is also provided with a second sliding hole connected to the first sliding hole.

[0053] See also Figure 1 , Figure 2 , Figure 7 and Figure 8 The moving part 62 includes a matching rod 621, a second motor 622, an insert rod 623, a positioning block 624 and a positioning groove 625. The upper end surface of the base 1 is rotatably mounted with a matching rod 621 with a spiral groove on the outer ring wall by setting a front-to-back symmetrical bearing seat. The matching rod 621 movably passes through the first sliding hole. A tension spring sleeved on the matching rod 621 is fixedly installed between the protrusion 615 and the front side of the bearing seat. The upper end surface of the base 1 is fixedly mounted with a second motor 624 whose output end is fixedly connected to the matching rod 621. 22. An insert rod 623 is slidably installed in the second sliding hole. The ball disposed at the lower end of the insert rod 623 cooperates with the spiral sliding groove of the matching rod 621. A matching circular plate is fixedly installed at the upper end of the insert rod 623. A plurality of positioning blocks 624 are fixedly installed in a circular array on the outer ring wall at the lower end of the insert rod 623. An upper and lower group of positioning grooves 625 are opened on the inner ring wall of the second sliding hole, and the positioning blocks 624 correspond to the positioning grooves 625 one by one. The positioning blocks 624 are snap-fitted with the positioning grooves 625, and the positioning blocks 624 are made of rubber.

[0054] See also Figure 1 and Figure 7 The unlocking portion 63 includes a matching plate 631, which is fixedly installed on the rear bearing seat and is symmetrical with respect to the left and right. The matching plate 631 is composed of a triangular block plate in the front and a rectangular plate in the rear. The matching plate 631 matches with the insertion rod 623.

[0055] During specific operation, after the pressing mechanism 4 and the testing mechanism 5 cooperate to complete the gridding, the tape on the fixed column 614 is pulled out and passed from under the rear end of the rolling roller 613, and then the tape head is fixed to the upper end surface of the base 1. At this time, the positioning block 624 on the insertion rod 623 is inserted into the positioning groove 625 of the lower group, so that the insertion rod 623 contacts the spiral groove of the matching rod 621, and then the second motor 622 is started to rotate the matching rod 621, and the matching rod 621 cooperates with the spiral groove to move backward with the protrusion 615, and in the process of moving, the rolling roller 613 will roll the tape to the upper end surface of the sample, so that the tape can be adhered to the surface of the cut sample to ensure that the contact between the tape and the sample surface is more uniform and complete.

[0056] When the protrusion 615 reaches the matching plate 631, the insertion rod 623 will enter between the left and right symmetrical matching plates 631, and the triangular block plate in front of the matching plate 631 will squeeze the matching circular plate upward, causing the insertion rod 623 to move upward until the positioning block 624 on the insertion rod 623 is inserted into the positioning groove 625 of the upper group. At this time, the insertion rod 623 is no longer in contact with the spiral groove of the matching rod 621. At this time, the protrusion 615 is quickly pulled forward under the action of the tension spring, thereby quickly tearing off the tape. In this process, the slide rail 611 and the supporting slider 612 cooperate to provide it with a moving direction. After the protrusion 615 is reset, the worker presses the insertion rod 623 downward so that the positioning block 624 is again inserted into the positioning groove 625 of the lower group, thereby making the insertion rod 623 contact with the spiral groove of the matching rod 621 again.

[0057] Then the worker carefully inspects the grid area with a magnifying glass, records the paint film peeling, and scores it according to the preset standard level. At present, the results of the 100-grid method test are usually divided into six levels according to international standards, from 0 to 5, where 0 represents the best adhesion and 5 represents the worst adhesion; the specific classification is as follows: Level 0: The edge of the cut is completely smooth, and there is no peeling at the edge of the grid; Level 1: There is a small piece of peeling at the intersection of the cut, but the actual damage in the cross-grid area does not exceed 5%; Level 2: The edge and / or intersection of the cut are peeled, and the area is greater than 5%, but less than 15%; Level 3: There is partial peeling or large peeling along the edge of the cut, and / or some grids are peeled off in whole pieces. The peeled area is more than 15%, but less than 35%; Level 4: Large pieces of peeling on the edge of the cut / or some squares are partially or completely peeled off, and the area is greater than 35% of the cross-grid area, but not more than 65%; Level 5: Exceeding the previous level means that most or all of the coating has fallen off from the substrate.

[0058] See also Figure 1-Figure 8The present invention also provides a testing method using the above-mentioned automobile paint adhesion performance testing machine. The specific testing method includes the following steps: S1: Preparation: Place the sample to be tested between the limit blocks 2, and ensure that the surface of the sample is clean, dry, and free of dust or oil.

[0059] S2: Cutting the grid: Start the electric push rod 523 in the positive direction to push the L-shaped plate 524 backward, and make the three cutters 515 move backward synchronously through the connecting rod 516, so that the cutters 515 perform the first gridding operation on the corresponding position of the upper end surface of the template.

[0060] Then, the cylinder 411 is started in the reverse direction to make the limit slider 513 return to the axis of the first turntable 511, and then the first turntable 511 is rotated 90 degrees through the cooperation of the execution part 51 and the matching part 52, and then the cutter 515 contacts the sample again through the driving part 41, and the electric push rod 523 is started to push the L-shaped plate 524 to the left, so that the cutter 515 performs a second grid operation on the corresponding position of the upper surface of the sample, so that the cutter 515 is perpendicular to the plane of the test piece, and cuts with uniform pressure and speed, so as to form multiple cross grids.

[0061] S3: Clean the surface: Use a soft-bristled brush to gently brush the grid diagonally backwards 5 times and forwards 5 times to remove loose debris so that the experimental results can be observed more accurately.

[0062] S4: Adhesive tape: Pull out the tape on the fixed column 614 and pass it under the rear end of the rolling roller 613, then fix the tape head on the upper end surface of the base 1, and then start the second motor 622 to move the protrusion 615 backward. During the movement, the rolling roller 613 will roll the tape to the upper end surface of the template, so that the tape can be adhered to the surface of the cut template.

[0063] When the protrusion 615 reaches the matching plate 631, the moving part 62 cooperates with the unlocking part 63 so that the insertion rod 623 is no longer in contact with the spiral groove of the matching rod 621. At this time, the protrusion 615 is quickly pulled forward under the action of the tension spring, thereby quickly tearing off the tape.

[0064] S5: Observational evaluation: Use a magnifying glass to carefully inspect the grid area, record the paint film peeling situation, and score according to the preset standard grade.

[0065] S6: Subsequent processing: After the test is completed, clean the test area and repair it if necessary.

[0066] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automobile paint adhesion performance testing machine, comprising a base, characterized in that: A limit block for limiting the position of the sample is fixedly installed on the upper end surface of the base, a profile frame located above the limit block is fixedly installed on the upper end surface of the base, a pressing mechanism is arranged on the profile frame, and a testing mechanism for cooperating with the pressing mechanism to synchronously cut a plurality of grids with different spacings on the surface of the sample is arranged on the pressing mechanism; The pressing mechanism includes a driving part arranged on the mold frame and used to provide uniform pressure for the testing mechanism, the driving part includes a cylinder, a triangular plate and an equipment plate, and the driving part is provided with an extrusion part for pressing the sample downward; The testing mechanism comprises an execution part arranged on the driving part, and the driving part is also provided with a matching part for cooperating with the execution part to change the cutting direction and a limiting part for implementing a cross-shaped limit on the cutting direction of the execution part; The base is provided with an adhesion mechanism cooperating with the testing mechanism; The adhesive mechanism comprises a glue sticking part arranged on the base, the glue sticking part is provided with a moving part for cooperating with it to stick the tape to the surface of the sample after being cut by the testing mechanism, and the moving part is provided with an unlocking part for cooperating with it to quickly tear off the tape; The execution part includes a first turntable, a limiting slide groove, a limiting slider, a knife seat, a cutter and a connecting rod. The lower end surface of the equipment plate is installed with three first turntables in a linear array from front to back through bearings. The lower end surface of the first turntable is penetrated by a limiting slide groove, and a limiting slider is slidably installed in the limiting slide groove. A spring is fixedly installed between the limiting slider and the limiting slide groove. The knife seat is fixedly installed on the lower end surface of the limiting slider, and the cutter is fixedly installed on the lower end of the knife seat. The blade spacing of the three cutters decreases from front to back, and a connecting rod is fixedly installed on the upper end surface of the limiting slider.

2. The automobile paint adhesion performance testing machine according to claim 1, characterized in that: The upper end surface of the shaped frame is fixedly mounted with a cylinder, the telescopic end of the cylinder is fixedly mounted with a triangular plate located between the shaped frame and the base, and the lower end surface of the triangular plate is fixedly mounted with an equipment plate with a cavity inside through a support rod.

3. The automobile paint adhesion performance testing machine according to claim 2, characterized in that: The extrusion part comprises an extrusion plate, and a front-to-back symmetrical extrusion plate is fixedly mounted on the lower end surface of the equipment plate through a supporting rod, and the outer surface of the extrusion plate is covered with a rubber layer.

4. The automobile paint adhesion performance testing machine according to claim 1, characterized in that: The limiting part includes a limiting plate and a cross-shaped slideway. The upper end surface of the equipment plate is fixedly penetrated with a limiting plate corresponding to the first turntable. A cross-shaped slideway is penetrated on the limiting plate. The upper end of the connecting rod penetrates the corresponding cross-shaped slideway and is slidably connected thereto.

5. The automobile paint adhesion performance testing machine according to claim 2, characterized in that: The matching part includes a second turntable, a first motor, an electric push rod, an L-shaped plate and an arcuate slide. The three first turntables are connected by a first belt transmission. A second turntable located just to the right of a middle first turntable is installed on the upper end surface of the equipment plate through a bearing. The second turntable and the corresponding first turntable are connected by a first gear set. A first motor is fixedly installed in the equipment plate. The output end of the first motor is connected to the second turntable by a second gear set. An L-shaped plate located between the triangular plate and the equipment plate is commonly provided at the upper ends of the three connecting rods. The L-shaped plate is connected to the connecting rod by a bearing. An arcuate slide coaxial with the second turntable is provided on one side of the L-shaped plate close to the second turntable. An electric push rod is fixedly installed on the upper end surface of the second turntable. A matching slider hinged to the telescopic end of the electric push rod is slidably installed in the arcuate slide.

6. The automobile paint adhesion performance testing machine according to claim 1, characterized in that: The glue-applying part includes a slide rail, a supporting slider, a rolling roller, a fixed column and a protrusion. The upper end surface of the base is provided with a left-right symmetrical slide rail, and a supporting slider is slidably installed in the slide rail. A rolling roller is rotatably installed between the left-right symmetrical supporting sliders through an arranged shaft rod. A fixed column located above the rolling roller and used for fixing the tape roll is fixedly installed between the left-right symmetrical supporting sliders. A protrusion is fixedly installed on the supporting slider located on the right side, and a first sliding hole penetrating through the front and rear end surfaces of the protrusion is provided on the upper end surface of the protrusion. A second sliding hole connected to the first sliding hole is also provided on the upper end surface of the protrusion.

7. The automobile paint adhesion performance testing machine according to claim 6, characterized in that: The moving part includes a matching rod, a second motor, an insertion rod, a positioning block and a positioning groove, and the upper end surface of the base is rotatably installed with a matching rod with a spiral groove on the outer ring wall through a front-to-back symmetrical bearing seat, the matching rod movably passes through the first sliding hole, and a tension spring sleeved on the matching rod is fixedly installed between the protrusion and the bearing seat on the front side, the upper end surface of the base is fixedly installed with a second motor whose output end is fixedly connected to the matching rod, the insertion rod is slidably installed in the second sliding hole, the ball arranged at the lower end of the insertion rod cooperates with the spiral groove of the matching rod, the upper end of the insertion rod is fixedly installed with a matching circular plate, and a plurality of positioning blocks are fixedly installed on the outer ring wall of the lower end of the insertion rod in a circular array manner, and an upper and lower groups of positioning grooves are opened on the inner ring wall of the second sliding hole, and the positioning blocks correspond to the positioning grooves one by one, and the positioning blocks are clamped with the positioning grooves, and the positioning blocks are made of rubber.

8. The automobile paint adhesion performance testing machine according to claim 7, characterized in that: The unlocking part includes a matching plate, which is fixedly mounted on the bearing seat at the rear side and is symmetrical to the left and right. The matching plate is composed of a triangular block plate at the front and a rectangular plate at the rear, and the matching plate matches the insertion rod.

9. The automobile paint adhesion performance testing machine according to claim 1, characterized in that: A testing method using the above-mentioned automobile coating adhesion performance testing machine is also provided, and the specific testing method comprises the following steps: S1: Preparation: Place the sample to be tested between the limit blocks and ensure that the surface of the sample is clean, dry, and free of dust or oil; S2: Cutting grids: The cutting knife is made perpendicular to the plane of the test piece by cooperating with the pressing mechanism and the testing mechanism, and cutting is performed with uniform pressure and speed to form multiple cross grids; S3: Clean the surface: Use a soft brush to gently brush the grid back and forth 5 times along the two diagonal directions, and then brush forward 5 times to remove loose debris so that the experimental results can be observed more accurately; S4: Adhesive tape: Select a tape that meets the standards, apply the tape to the entire grid area through the adhesive mechanism, and ensure that the tape is in full contact with the coating, then quickly tear off the tape; S5: Observational evaluation: Use a magnifying glass to carefully inspect the grid area, record the paint film peeling situation, and score according to the preset standard grade; S6: Subsequent processing: After the test is completed, clean the test area and perform repairs.

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