A device for testing the coating bond of small cubic test specimens

Abstract

The utility model relates to the technical field of coating performance test, concretely relates to a testing device for small cubic sample coating adhesion, which comprises a pulling-up mechanism, a pulling-down mechanism and a fixing mechanism for fixing a base body, the pulling-up mechanism comprises a pulling-up rod and a puller connected coaxially, the diameter of the puller is larger than that of the pulling-up rod; the pulling-down mechanism comprises a clamping plate and a pulling-down rod, the clamping plate comprises at least one side plate and one bottom plate, a containing space for containing a sample is formed between the side plate and the bottom plate, and the pulling-down rod is connected and fixed at the centroid of the side of the bottom plate far from the containing space; the fixing mechanism is detachably connected on the side plate and perpendicular to the side plate. Through the implementation of the scheme, the clamping of the small cubic sample is quickly and assistively completed, and the test experiment of the coating and base body adhesion of the small cubic sample is satisfied.

Description

Technical Field

[0001] This utility model relates to the field of coating performance testing technology, and specifically to a testing device for the coating adhesion of small cubic specimens. Background Technology

[0002] Coating adhesion strength refers to the bond strength between the coating and the substrate of a sample. It is a crucial indicator for judging the quality and performance of a coating. To ensure the adhesion between the coating and the substrate, testing is necessary to determine this bond strength. Qualified coating adhesion strength ensures that the coating will not peel, flake, or crack during use, thereby protecting the substrate and extending the coating's service life. Therefore, the selection and correct application of coating adhesion testing methods are vital to the coating industry. Insufficient adhesion strength can lead to reduced coating life and premature failure, or even severe damage such as localized peeling and flaking, rendering the coating unusable.

[0003] The most commonly used method for testing coating adhesion is the tensile test, which involves clamping the substrate and coating directly for testing. Currently, the thickness of conventional samples is at least 10 cm, and the coating thickness is at least 3 cm. For samples with large substrates and thick coatings, the tensile test can be used directly. For example, in CN105277486B, a measuring device and method for measuring the interfacial bonding strength of a sample's coating is described, where the sample is made into a stepped shaft shape and tested using the measuring device described in the patent. However, this measuring device or method is only useful for products with slightly larger volumes. Our company's newly developed sample has an overall thickness of only 2 cm, and its coating thickness is only about 0.3-0.5 cm. Because the small sample is too small and the coating thickness is too thin, existing tensile testing devices cannot effectively clamp it. Therefore, a testing device specifically designed for small samples is needed. Utility Model Content

[0004] The present invention aims to provide a testing device for the coating adhesion of small cubic specimens. This testing device clamps the small cubic specimens, solving the problem that there is no available device for testing the coating adhesion between small cubic specimens and the substrate.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A testing device for coating adhesion of small cubic specimens includes an upper pull mechanism, a lower pull mechanism, and a fixing mechanism for fixing a substrate. The upper pull mechanism includes an upper pull rod and a pull head coaxially connected, with the diameter of the pull head being larger than the diameter of the upper pull rod. The lower pull mechanism includes a clamping plate and a lower pull rod. The clamping plate includes at least one side plate and one bottom plate, with the side plate and the bottom plate forming a receiving space for accommodating the specimen. The lower pull rod is fixed to the centroid of the side of the bottom plate away from the receiving space. The fixing mechanism is detachably connected to the side plate and perpendicular to the side plate.

[0007] The principles and advantages of this scheme are:

[0008] The device boasts a rational and efficient structure, enabling rapid fixation of small cubic specimens for coating-substrate adhesion testing. Existing coating-substrate adhesion measurement devices are designed for larger cubic specimens (10-15cm), lacking a dedicated device for smaller cubes (around 2cm). The inventors analyzed and compared existing testing devices, focusing on the structural characteristics of small cubes. They discovered that the inability to directly use existing devices with small cubic specimens stems from the thin coating (only 0.3-0.5cm), making it impossible to clamp and test. The device in patent publication CN105277486B requires specimens with a sufficiently thick coating (at least 3cm, i.e., standard specimens; otherwise, the thin coating will break before detaching from the substrate, making adhesion measurement impossible). This ensures accurate test data. Based on this research... Considering this, the inventor designed this device, changing the direct clamping tension to contact tension. The device mainly consists of an upper pull mechanism, a lower pull mechanism, and a fixing mechanism. The upper pull mechanism is inserted into the sample, making the pull head contact the inner surface of the coating, thus connecting the upper pull mechanism to the sample. Then, the sample is placed in the receiving space of the lower pull mechanism, and the fixing rod is inserted to secure the substrate. This quickly completes the installation of the device, allowing for immediate measurement and testing, which is highly efficient and convenient. During testing, the upper and lower pull rods are clamped; the upper tension acts on the coating through the pull head, while the lower tension acts on the substrate through the lower pull mechanism. This effectively solves the problem of the lack of usable devices for testing the adhesion between coatings and substrates on small cubic samples. Furthermore, this device has a low cost, reducing the cost and burden of testing.

[0009] Preferably, as an improvement, the fixing mechanism includes a fixing rod and two first pin holes formed on the side plate, with the fixing rod slidably connected at the first pin holes.

[0010] The base can be quickly fixed by using the fixing rod in conjunction with the first pin hole on the side plate, which effectively solves the problem of the base being too small to be clamped. The overall operation is simple and improves the installation efficiency.

[0011] Preferably, as an improvement, there are two side plates, which are parallel and vertically connected to the bottom plate, and the accommodating space formed by the two side plates and the bottom plate is a U-shaped groove.

[0012] For ease of processing and production, the side plates are designed as two pieces, which can be flexibly adjusted to meet the needs of samples of different specifications, thereby improving the applicability of the device.

[0013] Preferably, as an improvement, the cross-section of the fixing rod is rectangular.

[0014] Conventional circular cross-section fixing rods cause the entire device to become unstable during use, resulting in the upper mechanism rotating and making subsequent installation and fixation more troublesome. In order to facilitate overall installation and improve installation efficiency, the cross-section of the fixing rod is designed as a rectangular cross-section. Rectangular cross-sections are the most conventional and simple to process, have the lowest cost, and can effectively solve the problem of installation and fixation trouble caused by the rotation of the sample and the upper pulling mechanism.

[0015] Preferably, as an improvement, the clamped parts of the upper and lower pull rods are provided with an anti-slip mechanism, which consists of multiple annular grooves.

[0016] Because the device is relatively small, there is a slippage problem when using a universal tensile testing machine. To prevent slippage from affecting the test results, multiple annular grooves are installed at the clamping parts of the upper and lower pull rods to prevent slippage and ensure the clamping stability of the upper and lower pull rods during the test.

[0017] Preferably, as an improvement, the sample also includes a specimen, wherein the substrate and coating of the specimen are coaxially provided with through holes for connecting the pull-up mechanism, the through holes in the substrate are larger than the diameter of the pull head, the through holes in the coating are smaller than the diameter of the pull head but larger than the diameter of the pull rod, and a second pin hole for connecting the fixing rod is provided on the substrate.

[0018] To better facilitate the use of this device, through holes for connecting the pull-up mechanism are coaxially opened on the substrate and coating of the sample, and second pin holes are opened on both sides of the substrate. The fixing rod passes through the second pin holes to effectively fix the substrate.

[0019] Preferably, as an improvement, the upper pull rod is provided with a third pin hole for connecting the fixing rod.

[0020] After the test is completed, the upper and lower mechanisms are not directly connected. Since the device is small in size, the upper mechanism is easy to lose and is not easy to store. Therefore, in order to facilitate the proper preservation of this device, a third pin hole is provided on the upper pull rod. When the test is completed, the upper pull rod can be connected to the lower mechanism through the fixing rod, which effectively avoids the problem of accidental loss and preservation of the upper pull rod. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0022] Figure 2 This is an exploded view of the structure of an embodiment of the present utility model.

[0023] Figure 3 This is a detailed structural diagram of the sample according to an embodiment of the present invention.

[0024] Figure 4 This is a cross-sectional view of an embodiment of the present utility model.

[0025] Figure 5 This is a schematic diagram of the device storage state according to an embodiment of the present invention.

[0026] The reference numerals in the accompanying drawings include: pull-up mechanism 1, pull-down mechanism 2, sample 3, fixing mechanism 4, anti-slip mechanism 5, pull-up rod 101, pull head 102, third pin hole 103, side plate 201, bottom plate 202, pull-down rod 203, first pin hole 204, coating 301, substrate 302, second pin hole 303, first through hole 304, second through hole 305, fixing rod 401, and fixing ring 402. Detailed Implementation

[0027] The following detailed description illustrates the specific implementation method:

[0028] The basic implementation examples are as follows: Figure 1-5 As shown:

[0029] As attached Figure 1 and attached Figure 2 As shown, a testing device for the coating adhesion of a small cubic sample includes an upper pull mechanism 1, a lower pull mechanism 2, and a fixing mechanism 4. The lower pull mechanism 2 includes two side plates 201, a bottom plate 202, and a lower pull rod 203. The two side plates 201 and the bottom plate 202 form a U-shaped groove. The lower pull rod 203 is connected and fixed at the centroid of the bottom surface of the bottom plate 202. The two side plates 201 are provided with first pin holes 204. The U-shaped groove is used to accommodate the sample 3, and the lower pull rod 203 plays a clamping role.

[0030] The pull-up mechanism 1 includes an upper pull rod 101 and a pull head 102. The pull head 102 is coaxially connected to the lower end of the upper pull rod 101. The diameter of the upper pull rod 101 is smaller than the diameter of the pull head 102. The upper pull rod is also provided with a third pin hole 103. The upper pull rod 101 is used for clamping, and the pull head 102 is used for direct contact and pulling of the coating 301. After the test is completed, the fixing rod is inserted into the first pin hole 204 and the third pin hole 103 to connect the upper pull rod 101 to the pull-down mechanism, effectively avoiding the loss and storage problems of the upper pull rod 101.

[0031] The structure of sample 3 is shown in the attached figure. Figure 3As shown, the system includes a substrate 302 and a coating 301. The coating 301 is connected to the upper surface of the substrate 302. The substrate 302 has a first through hole 304 coaxially formed along its vertical axis. The diameter of the first through hole 304 is equal to the diameter of the pull head 102. The first through hole 304 is used for the pull head 102 to enter and exit. The coating 301 has a second through hole 305 coaxially formed with the first through hole 304. The diameter of the second through hole 305 is slightly larger than the diameter of the upper pull rod 101 and smaller than the diameter of the pull head 102. The second through hole 305 is used for the upper pull rod 101 to enter and exit. The substrate 302 has a second through pin hole 303 in the transverse direction. The size of the second pin hole 303 matches the size of the fixing rod 401. The upper pull rod 101 extends upward through the second through hole 305 of the coating 301. The pull head 102 is tightly attached to the inner side of the coating 301, and the substrate 302 is tightly attached to the U-shaped groove. The fixing mechanism 4 includes a fixing rod 401 and a fixing ring 402. The length of the fixing rod 401 is greater than the distance between the two first pin holes 204. The fixing rod 401 is inserted into the first pin hole 204 and the second pin hole 303.

[0032] The structure of sample 3 is specially designed. The first through hole 304 on the substrate 302 is used to accommodate the pull head 102, and the second through hole 305 on the coating 301 is used for the upper pull rod 101 to pass through. The second pin hole 303 on the substrate 302 is used to cooperate with the fixing mechanism 4 to complete the fixation of the substrate 302 and the pull-down mechanism 2. The fixing ring 402 not only facilitates the operation of the fixing rod 401, but also limits the fixing rod 401 to prevent it from coming out. When the upper pull rod 101 is pulled, the force is transmitted to the contact surface between the pull head 102 and the coating 301 until the coating 301 peels off from the substrate 302. This completes the test of the adhesion between the coating 301 and the substrate.

[0033] Both ends of the upper pull rod 101 and the lower pull rod 203 are equipped with anti-slip mechanisms 5. The anti-slip mechanism 5 consists of multiple annular grooves. When the clamps of the universal tensile testing machine clamp the upper pull rod 101 and the lower pull rod 203, the anti-slip mechanism 5 can effectively improve the clamping effect and prevent slippage from affecting the test results.

[0034] The specific implementation method is as follows:

[0035] The device is arranged as shown in the attached diagram when not in use. Figure 5As shown, first, grasp the fixing ring 402 and pull the locking pin out of the third pin hole 103 and the first pin hole 204. Take out the upper pull mechanism 1, then align the upper pull rod 101 with the second through hole 305 of the sample 3 and insert it until the inner side of the coating 301 is in contact with the pull head 102. Grasp the upper pull rod 101 and place the sample 3 into the U-shaped groove so that the second pin hole 303 is aligned with the first pin hole 204. At this time, the bottom of the pull head 102 is located above the second pin hole 303. Grasp the locking pin, align it with the first pin hole 204 and insert it all the way down. The locking pin is in contact with the bottom of the pull head 102 to complete the limiting of the pull head 102 and the overall installation connection. After the overall installation is in place, see attached figure. Figure 1 As shown, by clamping the upper pull rod 101 and the lower pull rod 203 with a tensile universal testing machine, the bonding force between the coating 301 and the substrate can be tested. After the test is completed, pull out the locking pin, take out the substrate 302, grasp the upper pull rod 101 and attach the pull head 102 to the bottom of the groove, and make the second pin hole 303 and the third pin hole 103 coaxial. Insert the locking pin into the second pin hole 303 and the third pin hole 103 to complete the storage of the device.

[0036] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A device for testing the coating bond strength of small cubic test specimens, characterized in that: It includes an upper pull mechanism, a lower pull mechanism, and a fixing mechanism for fixing the substrate. The upper pull mechanism includes an upper pull rod and a pull head coaxially connected, with the diameter of the pull head being larger than the diameter of the upper pull rod. The lower pull mechanism includes a clamping plate and a lower pull rod. The clamping plate includes at least one side plate and one bottom plate, with the side plate and the bottom plate forming a receiving space for accommodating the sample. The lower pull rod is connected and fixed at the centroid of the side of the bottom plate away from the receiving space. The fixing mechanism is detachably connected to the side plate and perpendicular to the side plate.

2. A device for testing the coating bond of small cubic samples according to claim 1, characterized in that: The fixing mechanism includes a fixing rod and two first pin holes opened on the side plate, with the fixing rod slidably connected to the first pin holes.

3. A device for testing the coating bond of small cubic samples according to claim 2, characterized in that: The number of side plates is two, and the two side plates are parallel and vertically connected to the bottom plate. The accommodating space formed by the two side plates and the bottom plate is a U-shaped groove.

4. A device for testing the coating bond of small cubic samples according to claim 3, characterized in that: The cross-section of the fixing rod is rectangular.

5. A device for testing the coating bond of small cubic samples according to claim 4, characterized in that: The clamped parts of the upper and lower pull rods are equipped with anti-slip mechanisms, which consist of multiple annular grooves.

6. A device for testing the coating bond of small cubic samples according to claim 5, characterized in that: It also includes a sample, on which through holes for connecting the upper pull mechanism are coaxially opened on the substrate and coating. The through hole in the substrate is larger than the diameter of the pull head, and the through hole in the coating is smaller than the diameter of the pull head but larger than the diameter of the upper pull rod. A second pin hole for connecting the fixing rod is opened on the substrate.

7. The testing device for coating adhesion of small cubic specimens according to claim 6, characterized in that: The upper pull rod is provided with a third pin hole for connecting the fixing rod.

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