A device for detecting the bonding strength of a non-flat surface and a method for detecting the same

Abstract

The application relates to the technical field of building detection, in particular to a bonding strength detection device for a non-flat surface and a detection method thereof, which comprises a shell, a plurality of identical detection units are arranged in the shell, the detection units are arranged in the same direction, each detection unit is arranged opposite to a non-flat detection surface and abuts against the detection surface, and a driving structure for moving the detection units along the self direction is arranged in the shell. The application has the effect of reducing the bonding strength error when measuring the non-flat surface.

Description

Technical Field

[0001] This application relates to the field of building inspection technology, and in particular to a device and method for testing the bonding strength of non-flat surfaces. Background Technology

[0002] Adhesion strength refers to the force required to break the bond between coatings or between the coating and the substrate when a vertical and uniform tensile force is applied to the surface of a sample at a specified speed. In actual measurement, the sample is usually selected first. After the sample is determined, the coating is bonded to the sample. Then, a standard block is pressed onto the coating and bonded to the sample. The sample is then placed under set environmental conditions (temperature, humidity, etc.) for curing. After the required time and standard are reached, the standard block is fixedly connected to the pull rod of the adhesion strength tester for tensile strength measurement until the standard block and the sample are separated. The adhesion strength tester then measures the adhesion strength value.

[0003] However, in the above-mentioned test process, it is necessary to ensure the flatness of the bonding surface of the sample and the standard block, and to set the two sides almost parallel, using the overlapping surface of the two as the force-bearing surface, so as to provide an area basis for measuring the bonding strength. The force exerted by the sample and the standard block when they separate is divided by this area basis to obtain the bonding strength. However, in the process of bridge engineering and building construction, the bonding surface is actually mostly an uneven plane. Different flatness will cause more anchoring effect between the bonding surface and the coating, making the connection between the two more solid. This will cause the force data measured by the bonding strength measuring instrument to be too large. In addition, the parallel overlapping surface is still used as the force-bearing area in the process of calculating the bonding strength, which will make the final measured bonding strength too large, resulting in errors. Summary of the Invention

[0004] In order to reduce the error in measuring the bonding strength of uneven surfaces, this application provides a bonding strength testing device and method for uneven surfaces.

[0005] The bonding strength testing device and method for non-flat surfaces provided in this application adopt the following technical solution:

[0006] First aspect

[0007] A bonding strength testing device for a non-flat surface includes a housing, within which are arranged a plurality of identical testing units, all of which are arranged in the same direction and are positioned directly opposite and in close contact with the non-flat testing surface. The housing also includes a driving structure for moving the testing units along their own orientation.

[0008] By adopting the above technical solution, multiple detection units are set up, and each detection unit is driven by a driving structure to approach the uneven detection surface. According to the unevenness of the detection surface, each detection unit is misaligned to different degrees until the driving structure is blocked and the movement of the detection unit stops. In this way, the movement variable of the detection unit is indirectly converted into an approximate surface area value on the detection surface, so as to more accurately measure the stress area and improve the accuracy of post-bonding strength measurement.

[0009] Optionally, the detection units are arranged close to each other, and the detection units are distributed along a plane perpendicular to their orientation, with the projection of each detection unit onto the detection surface covering the detection surface.

[0010] By adopting the above technical solution, each detection unit is set close to each other and perpendicular to the detection surface. The displacement difference of each detection unit on the detection surface is measured by the close contact. The curve trajectory of each column of detection units is drawn according to the column width of each detection unit. The approximate value of the surface area of ​​the curve of that column can be obtained by the column width of each detection unit. The approximate values ​​of the remaining columns of detection units are measured. The sum of all values ​​is the approximate value of the uneven detection surface. The measured area is closer to the true area. Therefore, the bonding strength can be measured more accurately when measuring and calculating the bonding strength.

[0011] Optionally, the detection unit includes a rectangular parallelepiped resistor and a carrier. The carrier is hollow, and the resistor is fixedly connected inside the carrier. A guide rod is provided along the length of the resistor and through the carrier. The guide rod is fixedly connected to the inner wall of the housing. Two conductors are embedded in the guide rod along the length of the resistor. The two conductors are not connected. A first contact that abuts against the resistor is fixedly connected to one end of the conductor in the guide rod near the detection surface. A second contact that abuts against the other conductor embedded in the guide rod is also fixedly provided on the resistor. The second contact is located away from the detection surface. The two conductors of the guide rod are connected in series as wires and connected to the same external circuit.

[0012] By adopting the above technical solution, each resistor block is connected to two conductors in the guide rod through the first contact and the second contact. The first contact is on one conductor, the second contact is fixedly connected to the resistor block, and the guide rod is fixedly connected to the housing. This provides guidance for the drive structure to move the carrier. When the carrier moves, it indirectly drives the resistor block and the second contact to move, thereby shortening the distance between the first contact and the second contact and forming a sliding rheostat structure. When the two conductors are connected to an external circuit, the displacement through the housing can be indirectly converted into a change in resistance. The magnitude of the changed current is measured by the external circuit, and the value of the displacement is obtained after adjustment.

[0013] Optionally, the drive structure includes an injection chamber disposed within the housing and a piston within the injection chamber. The cavity formed by the side of the integral structure of each detection unit away from the detection surface and the inner wall of the housing is connected to the injection chamber. The housing, each detection unit, and the piston form a closed loop to form a sealed space, which is filled with hydraulic oil. A piston drive device is externally connected to the side of the piston away from the hydraulic oil to drive it.

[0014] By adopting the above technical solution, the external piston drive device can be mechanical, pneumatic or hydraulic, so that the piston can perform telescopic movement, squeezing hydraulic oil into the housing, each detection unit and piston closed ring to form a sealed space, pushing each detection unit to press against the detection surface, so as to realize the measurement of the detection surface.

[0015] Optionally, the carrier has a movable space, the guide rod has a sealing layer, the first contact penetrates the sealing layer and is placed inside the carrier, the sealing layer of the guide rod also has a movable through groove, and the second contact is tightly pressed against the conductor and is always located inside the carrier.

[0016] By adopting the above technical solution, the sealing layer prevents hydraulic oil from flowing into the carrier and the guide rod, thus preventing any impact on the circuit. The movable through groove ensures that the guide rod can maintain a sealed condition, allowing the second contact to always connect the resistor block and the conductor.

[0017] Second aspect

[0018] A method for testing the bond strength of a non-flat surface includes the following steps:

[0019] S1: Prepare a sample with a non-flat test surface;

[0020] S2: Position the detection unit side of the detection device directly opposite the sample and press it firmly against the sample surface. Activate the drive structure to press the detection unit firmly against the detection surface of the sample, thereby indirectly obtaining the length change of each detection unit along its length direction.

[0021] S3: Obtain a measurement value that is close to the true value of the surface area of ​​the sample test surface through post-processing.

[0022] S4: Use adhesive to bond standard blocks with the same cross-sectional area as each detection unit of the detection device to the sample, and cure them for a specified time under specified environmental conditions (temperature, humidity, etc.);

[0023] S5: After bonding, the standard block is stretched using a bond strength tester to measure the separation force;

[0024] S6: The bond strength is obtained by calculating and processing the measured surface area and the force measured by the bond strength tester.

[0025] By adopting the above technical solution, after the sample is shaped, the surface area of ​​the test area of ​​the sample is measured by the testing device. After the surface area of ​​the uneven surface is measured, the standard block is glued to the sample and cured for the required time. Then, the tensile force of the standard block is measured by the adhesive strength measuring instrument. The adhesive strength is calculated by combining the surface area and the tensile force.

[0026] Optionally, in S3, after the detection unit is finalized, a change curve is plotted by measuring the change distance of each column of detection units. The side length of each carrier is a known quantity. The approximate surface area of ​​the detection surface corresponding to the detection unit in that column is calculated. This operation is repeated to measure the approximate surface area of ​​the remaining columns. The total surface area is obtained by summing the results.

[0027] By adopting the above technical solution, in the process of calculating the surface area of ​​an uneven measuring surface, firstly, a detection unit of the same specification is pressed tightly against the measuring surface. Then, taking each column as a unit, the displacement change curve is obtained by measuring the displacement amount, thereby calculating the length of the change curve. Then, based on the side length of the detection unit and the corresponding side length of the surface, the approximate value of the surface area can be obtained by multiplying the product. After repeating the detection units of the remaining columns, the total surface area is obtained.

[0028] Optionally, in steps S3 and S4, the detection device and the standard block are arranged in parallel to each other.

[0029] By adopting the above technical solution, the detection device and the standard block are kept in parallel before and after the measurement to reduce experimental errors.

[0030] In summary, this application includes at least one of the following beneficial technical effects:

[0031] 1. By setting up several identical testing units, the uneven testing surface is divided into several small areas. The changes are measured by the testing units and integrated by the external circuit to convert them into the displacement of the testing units. The approximate surface area of ​​the uneven surface is then determined according to the specifications of the testing units themselves. This surface area is used as the benchmark for the bonding strength test to improve the measurement accuracy of the values.

[0032] 2. The use of hydraulic oil facilitates the synchronous movement of each detection unit. Attached Figure Description

[0033] Figure 1 This is a structural schematic diagram of an embodiment of this application.

[0034] Figure 2 This is an embodiment of the present application. Figure 1 A magnified view of a portion of point A in the middle.

[0035] Explanation of reference numerals in the attached figures:

[0036] 1. Housing; 2. Detection unit; 21. Resistor block; 22. Carrier; 23. Guide rod; 24. Conductor; 25. First contact; 26. Second contact; 3. Detection surface; 4. Drive structure; 41. Injection chamber; 42. Piston; 43. Hydraulic oil; 5. Moving space; 6. Sealing layer; 7. Moving channel. Detailed Implementation

[0037] The following is in conjunction with the appendix Figure 1-2 This application will be described in further detail.

[0038] This application discloses a bonding strength testing device for non-flat surfaces, referring to... Figure 1 and Figure 2 A bonding strength testing device for a non-flat surface includes a rectangular and vertically arranged housing 1. A blind hole is vertically opened on the bottom surface of the housing 1. Twenty-five identical testing units 2 are arranged at the bottom of the blind hole of the housing 1. Each testing unit 2 is arranged facing the opening of the blind hole. Each testing unit 2 is positioned directly opposite the non-flat testing surface 3 and is in close contact with the testing surface 3. Each testing unit 2 is always in close contact with each other and slides against each other, and is arranged in a 5x5 structure. Each testing unit 2 completely covers the cross-section of the blind hole, and when each testing unit 2 is at the bottom of the blind hole, it just completely fills the entire blind hole. The side of the housing 1 with the blind hole is in close contact with the testing surface 3 of the sample, and the projection of each testing unit 2 on the testing surface 3 covers the area to be measured on the testing surface 3.

[0039] The detection unit 2 includes a rectangular resistor block 21 and a carrier 22, both of which are vertically arranged. The carrier 22 is hollow, and the resistor block 21 is fixedly connected to the bottom of the carrier 22. A rectangular guide rod 23 is vertically arranged along the length of the resistor block 21 and through the top surface of the carrier 22. One end of the guide rod 23 is fixedly connected to the bottom of the blind hole of the housing 1, and the other end passes through and is placed inside the carrier 22. Two conductors 24 are embedded in the guide rod 23 in the vertical direction. The two conductors 24 are not connected. A first contact 25 is fixedly connected to one end of the conductor 24 in the guide rod 23 near the detection surface 3, and is pressed against the resistor block 21. A second contact 26 is also fixedly arranged on the resistor block 21, pressing against the other conductor 24 embedded in the guide rod 23. The second contact 26 is located above the first contact 25. The two ends of the two conductors 24 of the guide rod 23 are respectively connected to the same external circuit.

[0040] A sealing layer 6 is provided on the guide rod 23. The first contact 25 penetrates the sealing layer 6 and is placed inside the carrier 22. A moving space 5 is provided on the side of the carrier 22 away from the detection surface 3. A moving through groove 7 is also provided on the sealing layer 6 of the guide rod 23 in the vertical direction. The second contact 26 is tightly pressed against the conductor 24 and is always located inside the carrier 22.

[0041] The housing 1 is also provided with a drive structure 4, which includes an injection chamber 41 disposed in the housing 1 and a piston 42 disposed in the injection chamber. The piston 42 is horizontally disposed and divides the injection chamber into two parts. The injection chamber 41 is disposed on the side away from the bottom of the blind hole of the housing 1. The cavity formed by the overall structure of each detection unit 2 away from the detection surface 3 and the inner sidewall of the housing 1 is connected to the injection chamber 41. The housing 1, each detection unit 2 and the piston 42 form a closed loop to form a sealed space, which is filled with hydraulic oil 43. A through hole is opened on the upper surface of the housing 1 to connect the injection chamber 41. The piston 42 is externally connected to the side away from the hydraulic oil 43 to drive the piston 42. In this embodiment, the piston 42 drive device is a piston 42 handle. The piston 42 handle passes through the through hole and is fixedly connected to the piston 42. The piston 42 is moved by manually pressing the piston 42 handle against the piston 42. The piston 42 drive device can also use mechanical, hydraulic, pneumatic and other telescopic devices to make the piston 42 telescopic.

[0042] The implementation principle of the bonding strength testing device for non-flat surfaces in this application embodiment is as follows: the bottom surface of the testing device is aligned with the testing surface 3 of the sample, and the piston 42 handle is pushed by hand after pressing tightly, so that each carrier 22 is pressed tightly against the testing surface 3. After measuring the surface area of ​​the testing surface 3, the bonding strength test is performed.

[0043] This application also discloses a method for testing the bonding strength of non-flat surfaces, referring to... Figure 1 A method for testing the bond strength of a non-flat surface includes the following steps:

[0044] S1: Prepare a sample with a non-flat test surface 3;

[0045] S2: Position the detection unit 2 of the detection device facing the sample and press it firmly against the detection surface 3 of the sample. After pressing firmly, push the piston 42 handle so that each carrier 22 presses firmly against the detection surface 3, thereby indirectly obtaining the resistance change of each detection unit 2 in the vertical direction. The current change of the circuit is converted into the length change value of the detection unit 2 through the connected external circuit.

[0046] S3: After the detection unit 2 is shaped and the length change value is indirectly obtained, the change curve is plotted by measuring the change distance of each column of detection units 2. Since the side length of each carrier 22 is known, the surface area value of the detection surface 3 corresponding to the column of detection units 2 can be calculated. Repeat this operation to measure the surface area value of the remaining columns, and sum them to obtain the total surface area.

[0047] S4: Use adhesive to bond standard blocks with the same cross-sectional area as each detection unit 2 of the detection device to the sample on the detection surface 3, keep the front and rear settings of the detection device and the standard blocks parallel to each other, and cure for a specified time under specified environmental conditions;

[0048] S5: After bonding, the standard block is stretched using a bond strength tester to measure the separation force;

[0049] S6: The bond strength is obtained by calculating and processing the measured surface area and the force measured by the bond strength tester.

[0050] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A device for testing the bonding strength of a non-flat surface, characterized in that: Includes a housing (1), in which a plurality of identical detection units (2) are provided, each detection unit (2) is arranged in the same direction, each detection unit (2) is arranged facing the non-flat detection surface (3) and closely abutting the detection surface (3), and the housing (1) is also provided with a driving structure (4) for moving the detection unit (2) along its own orientation. Each of the detection units (2) is arranged close to each other, and each of the detection units (2) is distributed along a plane perpendicular to its orientation. The projection of each of the detection units (2) onto the detection surface (3) covers the detection surface (3). The detection unit (2) includes a rectangular parallelepiped resistor (21) and a carrier (22). The carrier (22) is hollow, and the resistor (21) is fixedly connected inside the carrier (22). A guide rod (23) is provided along the length of the resistor (21) and through the carrier (22). The guide rod (23) is fixedly connected to the inner wall of the housing (1). Two conductors (24) are embedded in the guide rod (23) along the length of the resistor (21). (24) Not connected, a first contact (25) is fixedly connected to one end of the conductor (24) inside the guide rod (23) near the detection surface (3), which is close to the resistor block (21). A second contact (26) is also fixedly provided on the resistor block (21) and close to the other conductor (24) embedded in the guide rod (23). The second contact (26) is located away from the detection surface (3). The two conductors (24) of the guide rod (23) are connected in series and connected to the same peripheral circuit. The drive structure (4) includes an injection chamber (41) disposed in the housing (1) and a piston (42) in the injection chamber. The cavity formed by the overall structure of each detection unit (2) away from the detection surface (3) and the inner wall of the housing (1) is connected to the injection chamber (41). The housing (1), each detection unit (2) and the piston (42) form a closed space, and the space is filled with hydraulic oil (43). The piston (42) is externally connected to a piston (42) drive device that drives it.

2. The bonding strength testing device for non-flat surfaces according to claim 1, characterized in that: The carrier (22) has a movable space (5), the guide rod (23) is provided with a sealing layer (6), the first contact (25) penetrates the sealing layer (6) and is placed inside the carrier (22), the sealing layer (6) of the guide rod (23) is also provided with a movable through groove (7), the second contact (26) is tightly pressed against the conductor (24) and is always located inside the carrier (22).

3. A method for testing the bond strength of a non-flat surface, based on the bond strength testing device for a non-flat surface as described in claim 2, comprising the following steps: S1: Prepare a sample with a non-flat test surface (3); S2: Position the detection unit (2) of the detection device directly against the sample and press it against the sample surface. Activate the drive structure (4) to press the detection unit (2) against the detection surface (3) of the sample, thereby indirectly obtaining the length change of each detection unit (2) along its length direction. S3: Obtain a measured value that is close to the true value of the surface area of ​​the sample detection surface (3) through output post-processing; S4: Use adhesive to bond standard blocks with the same cross-sectional area as each detection unit (2) of the detection device to the sample, and cure them for a specified time under specified environmental conditions (temperature, humidity, etc.); S5: After bonding, the standard block is stretched using a bond strength tester to measure the separation force; S6: The bond strength is obtained by calculating and processing the measured surface area and the force measured by the bond strength tester.

4. The method for testing the bonding strength of a non-flat surface according to claim 3, characterized in that: In S3, after the detection unit (2) is finalized, the change curve is plotted by measuring the change distance of each column of detection unit (2). The side length of each carrier (22) is a known quantity. The surface area value of the detection surface (3) corresponding to the column of detection unit (2) is calculated. This operation is repeated to measure the surface area value of the remaining columns. The total surface area is obtained by summing the results.

5. The method for testing the bonding strength of a non-flat surface according to claim 3, characterized in that: In steps S3 and S4, the detection device and the standard block are arranged in parallel to each other.

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