Coating tensile testing component and tensile testing machine

Abstract

The present invention discloses a coating tensile test assembly suitable for a tensile testing machine, wherein the tensile testing machine includes a clamping mechanism and a tensile device positioned above the clamping mechanism. The coating tensile test assembly includes: a specimen body having a clamping portion for clamping and positioning by the clamping mechanism and a coating surface for depositing a coating; a joint assembly including: a first joint for connecting to the output end of the tensile device; a second joint for gluing the coating deposited on the coating surface; a movable adjuster having one end rotatably connected to the first joint and the other end slidably connected to the second joint; a first adjustment surface for the first joint to rotatably abut against is provided on the movable adjuster; the first joint can rotate to abut against the first adjustment surface, thereby driving the movable adjuster to slide laterally relative to the second joint. The present invention can reduce the interference of the tangential load on the coating, thereby making the final measured interface bonding strength more accurate.

Description

Technical Field

[0001] The present invention relates to the technical field of composite material interface bonding strength measurement, in particular to a coating tensile force detection component and a tensile testing machine. Background Art

[0002] During production, mechanical equipment such as cranes often have a coating applied to their surfaces to protect the base material and enhance key properties such as wear resistance, corrosion resistance, and surface hardness. However, with continued use, the coating may peel or crack, leading to a loss of functionality. To ensure the long-term performance of the equipment surface and improve the coating quality, it is particularly important to evaluate the interfacial bonding strength between the coating and the substrate (i.e., the equipment itself).

[0003] Currently, the industry generally uses the tensile method to measure the interfacial bonding strength between the coating and the substrate. The substrate sample with the coating deposited on the surface is fixed on the workbench of the tensile testing machine, and the tensile detection component of the tensile testing machine is consolidated with the coating on the surface of the substrate sample through strong adhesive. The tensile testing machine then applies tensile force vertically upward to the tensile detection component continuously and incrementally, and the tensile force is transmitted to the coating until the coating and the substrate sample are separated, thereby measuring the interfacial bonding strength between the coating and the substrate sample.

[0004] However, the current tensile method for actually measuring the interface bonding strength of coatings has the following problems: due to factors such as positioning and assembly accuracy, when the tensile testing machine applies tensile force to the coating, bending or tilting will occur between the substrate sample and the tensile detection component, making it difficult to apply the tensile force completely vertically to the coating. That is, while the tensile testing machine applies vertical tensile force to the coating, it also introduces unnecessary tangential loads, thereby affecting the accuracy of the final measured interface bonding strength. Summary of the Invention

[0005] The present invention aims to provide a coating tensile force detection component and a tensile testing machine capable of improving the measurement accuracy of coating interface bonding strength.

[0006] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0007] A coating tensile detection assembly is suitable for a tensile testing machine, which includes a clamping mechanism and a tensile device positioned above the clamping mechanism. The coating tensile detection assembly includes: a specimen body having a clamping portion for clamping and positioning by the clamping mechanism, and a coating surface for depositing the coating; a joint assembly including: a first joint for connecting to the output end of the tensile device; a second joint for gluing the coating deposited on the surface of the coating surface; an movable adjuster, one end of which is rotatably connected to the first joint, and the other end of which is laterally slidable to connect to the second joint; a first adjustment surface for the first joint to rotatably abut is provided on the movable adjuster; the first joint can abut against the first adjustment surface by rotating, thereby driving the movable adjuster to slide laterally relative to the second joint.

[0008] Furthermore, one end of the first joint close to the movable adjuster is recessed inward to form a first slot, and a first shaft is arranged in the first slot; one end of the movable adjuster is provided with a first protrusion for the first shaft to rotatably pass through, and the other end is recessed inward to form a second slot, and a second shaft perpendicular to the first shaft is arranged in the second slot, and the second joint is provided with a second protrusion for the second shaft to axially slide through.

[0009] Furthermore, the second slot is provided with an elastic limiting structure, and the elastic limiting structure has an elastic element, and the elastic element is used to elastically abut the second protrusion when the movable adjuster slides laterally relative to the second protrusion.

[0010] Furthermore, the elastic element is an elastic pad layer arranged on the inner wall of the second slot.

[0011] Furthermore, the elastic element is a spring.

[0012] Furthermore, the elastic limiting structure includes a movable hole arranged on the outer wall of the movable adjuster, the movable hole passes through the second slot and is threadedly connected to a knob, a spring is connected to the knob, and the spring extends into the second slot through the movable hole and elastically abuts against the second protrusion.

[0013] Furthermore, one end of the spring away from the knob is connected to a connecting plate.

[0014] Furthermore, the second shaft is detachably provided through the second slot and the second protrusion.

[0015] Furthermore, the first shaft body is axially slidable and penetrates a first protrusion, the second shaft body is rotatably penetrates a second protrusion, and the second joint is provided with a second adjustment surface for the movable adjuster to rotatably abut.

[0016] On the other hand, the present invention also provides a tensile testing machine, which includes the coating tensile detection assembly as described above.

[0017] Compared with the prior art, the advantages of the present invention are:

[0018] 1. Under the action of tension, the first joint can rotate relative to the movable adjuster and abut the first adjustment surface of the movable adjuster, exerting a lateral component of force on the movable adjuster, thereby driving the movable adjuster to slide laterally relative to the second joint. The rotation of the first joint is converted into lateral sliding of the second joint through the movable adjuster, thereby adjusting the direction of the tension so that the tension is applied to the coating more vertically, reducing the interference of the tangential load on the coating, and making the final measured interface bonding strength more accurate.

[0019] 2. The movable adjuster can slide laterally relative to the first joint or the second joint, realizing two-dimensional adjustment with strong adjustment flexibility and adaptability;

[0020] 3. An elastic limiting structure is set to provide lateral elastic support and limiting effect on the movable regulator, which can cushion the movable regulator during movement, make the lateral sliding process of the movable regulator smoother, improve the stability of the component during operation, and can adaptively adjust the movable regulator through elasticity to improve the adjustment accuracy of the movable regulator. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic structural diagram of the coating tensile force detection assembly provided in this embodiment;

[0022] Figure 2 This is a schematic diagram of the structure of the coating tensile force detection assembly provided in this embodiment when it is not under tension;

[0023] Figure 3 A schematic diagram of the structure of the coating tension detection assembly provided in this embodiment when subjected to an inclined tension;

[0024] Figure 4 A schematic structural diagram of the movable regulator in the coating tension detection assembly provided in this embodiment;

[0025] In the picture:

[0026] Figure numerals: 1. Sample body; 11. Clamping part; 12. Coating surface; 2. Joint assembly; 21. First joint; 211. First slot; 212. First axis; 22. Movable adjuster; 221. First adjustment surface; 222. First protrusion; 223. Second slot; 224. Second axis; 23. Second joint; 231. Second protrusion; 232. Second adjustment surface; 3. Elastic limiting structure; 31. Spring; 32. Movable hole; 33. Knob; 4. Strong adhesive glue. DETAILED DESCRIPTION

[0027] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0030] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0031] The present invention is further described in detail below with reference to the accompanying drawings: Example 1:

[0032] refer to Figures 1 to 4 A coating tensile detection component is suitable for using a tensile testing machine to detect the interface bonding strength of a coating. The tensile testing machine includes a clamping mechanism and a tensile device positioned above the clamping mechanism. Like the tensile detection component used in existing tensile testing machines, the coating tensile detection component provided in this embodiment includes a sample body 1 and a joint assembly 2. A clamping portion 11 for clamping and positioning by the clamping mechanism is provided at one end of the sample body 1. A coating surface 12 for depositing a coating is provided at the end of the sample body 1 away from the clamping portion 11. The joint assembly 2 is used to connect the sample body 1 and the tensile device.

[0033] During operation, the sample body 1 can be clamped and positioned on the clamping mechanism of the tensile testing machine by the clamping part 11. The coating surface 12 of the sample body 1 is horizontally facing upward and is deposited with the coating. One end of the joint assembly 2 consolidates the coating on the coating surface 12 through the strong adhesive glue 4, and the other end is connected to the output end of the tensile device of the tensile testing machine by clamping or other means. The tensile device of the tensile testing machine applies a tensile force vertically upward to the coating, and the tensile force is transmitted to the coating through the joint assembly 2 until the coating is separated from the sample body 1, thereby measuring the interface bonding strength between the coating and the sample body 1.

[0034] Compared with the prior art, the improvement of the present application is that: the joint assembly 2 includes a first joint 21, an active adjuster 22 and a second joint 23 from top to bottom, the first joint 21 is used to connect the output end of the tensile device of the tensile testing machine, the second joint 23 is used to connect the coating on the surface of the coating surface 12 through the strong adhesive 4, one end of the active adjuster 22 can be rotatably connected to the first joint 21, and the other end of the active adjuster 22 can be slid laterally (i.e., perpendicular to the tensile direction) to connect to the second joint 23, and a first adjustment surface 221 is provided on the active adjuster 22, and the first adjustment surface 221 can be used for abutment when the first joint 21 rotates relative to the active adjuster 22. The first joint 21 can abut against the first adjustment surface 221 by rotating, thereby driving the active adjuster 22 to slide laterally relative to the second joint 23.

[0035] In the above technical solution, the movable adjuster 22 is a key innovative component. It is connected to the first joint 21 by rotation and connected to the second joint 23 by lateral sliding. This design can compensate for the bending or tilting caused by insufficient positioning and assembly accuracy, ensuring that the tension can act on the coating as vertically as possible. Specifically, when the tension device starts to apply tension, if there is a slight bending or tilt between the sample body 1 and the tension device, the first joint 21 will rotate relative to the movable adjuster 22 under the action of the tension and abut against the first adjustment surface 221 of the movable adjuster 22, applying a lateral component of force to the movable adjuster 22, thereby driving the movable adjuster 22 to slide laterally relative to the second joint 23. The rotation of the first joint 21 is converted into the lateral sliding of the second joint 23 through the movable adjuster 22, thereby adjusting the direction of the tension so that the tension is applied to the coating more vertically, reducing the interference of the tangential load on the coating, and making the final measured interface bonding strength more accurate.

[0036] The specific structures and connection methods of the first joint 21 , the movable adjuster 22 , and the second joint 23 are described below.

[0037] In this embodiment, one end of the first joint 21 close to the movable adjuster 22 is recessed inward to form a first slot 211, and a first shaft 212 is arranged in the first slot 211; one end of the movable adjuster 22 is provided with a first protrusion 222, and the first protrusion 222 is provided with a hole or groove matching the first shaft 212, and the first shaft 212 can rotatably pass through the first protrusion 222 through these holes or grooves, and the other end of the movable adjuster 22 is recessed inward to form a second slot 223, and a second shaft 224 perpendicular to the first shaft 212 is arranged in the second slot 223, and the second joint 23 is provided with a second protrusion 231 for the second shaft 224 to axially slide through.

[0038] Through the above technical solution, when the tension device starts to apply tension, due to the bending or tilting caused by insufficient positioning and assembly accuracy, it is difficult for the tension device to apply a tension that is completely perpendicular to the coating to the first joint 21, so that the first joint 21 is slightly deflected under the action of the tension, that is, the first joint 21 will rotate on the first protrusion 222 of the movable adjuster 22 through the first shaft 212 in the direction of the tension inclination. At the same time, the first joint 21 will abut the adjustment surface on the movable adjuster 22 while rotating, applying a reverse force to the movable adjuster 22, so that the movable adjuster 22 slides on the second protrusion 231 of the second joint 23 through the second shaft 224, thereby adjusting the direction of the tension to make it closer to perpendicular to the coating surface. Through the rotation of the first joint 21 and the sliding of the second joint 23, the movable adjuster 22 can adaptively adjust the direction of the tension, thereby ensuring the accuracy of the measurement results.

[0039] The advantages of the specific implementation of the above-mentioned first joint 21, movable adjuster 22, and second joint 23 provided in this embodiment are that: the movable adjuster 22 and the second joint 23 are slidably connected to each other through the slot and the shaft. This design of the slot and the shaft is not only simple in structure, but also in actual implementation, the slot width and the protrusion thickness can be designed to make the slot width slightly larger than the protrusion thickness, and the protrusion can be limited by the inner walls on both sides of the slot, thereby achieving precise micro-limit adjustment, avoiding errors caused by excessive sliding of the movable adjuster 22 and the second joint 23 due to inertia under large pulling force.

[0040] Taking into account the diversity of the tension applied by the tensile testing machine and the offset angle of the coating, which may be a horizontal lateral offset or a horizontal longitudinal offset, in order to further improve the tension adjustment performance of the joint assembly 2, this embodiment is further configured as follows: the first shaft 212 in the first slot 211 of the first joint 21 can also axially slide through the first protrusion 222 of the movable adjuster 22, and the second shaft 224 in the second slot 223 of the movable adjuster 22 can also rotatably pass through the second protrusion 231 of the second joint 23, and the second joint 23 is provided with a second adjustment surface 232 for the movable adjuster 22 to rotate and abut.

[0041] Originally, the first joint 21 could only rotate relative to the first protrusion 222 through the first shaft 212, and the movable adjuster 22 could only slide laterally relative to the second protrusion 231 through the second shaft 224. Now, the first joint 21 can rotate relative to the first protrusion 222 while also sliding laterally relative to the first protrusion 222 and the movable adjuster 22 through the first shaft 212; the movable adjuster 22 can slide laterally relative to the second protrusion 231 while also rotating circumferentially relative to the second protrusion 231 and the second joint 23 through the second shaft 224. This design enables the movable adjuster 22 to achieve two-dimensional adjustment in the horizontal, horizontal or vertical directions, and has greater flexibility and adaptability in responding to changes in the direction of tension.

[0042] Specifically, when the tensile device of the tensile testing machine has a horizontal lateral offset relative to the coating, the first joint 21 can be rotated relative to the movable adjuster 22, driving the movable adjuster 22 to slide laterally relative to the second joint 23, thereby compensating for the horizontal lateral tensile offset error; and when the tensile device of the tensile testing machine has a horizontal longitudinal offset relative to the coating, the movable adjuster 22 can be rotated relative to the second joint 23, and the second joint 23 can abut against the movable adjuster 22, thereby driving the movable adjuster 22 to slide laterally relative to the first joint 21, thereby compensating for the horizontal longitudinal tensile offset error.

[0043] However, due to the above design, the first joint 21, the movable adjuster 22, and the second joint 23 can slide and rotate relative to each other, which inevitably increases the instability and damage risk of the entire joint assembly 2.

[0044] In this regard, this embodiment is further improved: the first card slot 211 and the second card slot 223 are both provided with an elastic limiting structure 3, and the elastic limiting structure 3 includes an elastic element, which is used to elastically abut the second protrusion 231 when the movable adjuster 22 slides laterally relative to the first protrusion 222 or the second protrusion 231.

[0045] Since the purpose of providing the elastic limiting structure 3 in the first and second slots 211 and 223 is the same, the purpose of providing the elastic limiting structure 3 and the specific implementation structure of the elastic limiting structure 3 will be explained below by taking "providing the elastic limiting structure 3 in the second slot 223 and the relative movement between the movable adjuster 22 and the first joint 21" as an example.

[0046] The purpose of setting the elastic limiting structure 3 is as follows: taking the relative movement of the movable adjuster 22 and the first joint 21 as an example, 1. When the movable adjuster 22 is driven by the abutment of the first joint 21 and slides laterally relative to the second joint 23, the elastic limiting structure 3 can elastically abut the second protrusion 231 of the second joint 23, and the elastic element itself undergoes elastic deformation to apply elastic force to the movable adjuster 22. This elastic characteristic enables the elastic limiting structure 3 to effectively provide lateral support and limiting effects without hindering the normal sliding of the movable adjuster 22, thereby adjusting the movable adjuster 22. 1. The elastic limiting structure 3 is used to buffer the movement of the movable adjuster 22 relative to the second joint 23, so that the lateral sliding process of the movable adjuster 22 relative to the second joint 23 is smoother, thereby improving the stability of the component during operation; 2. In addition, when the movable adjuster 22 excessively slides under the action of inertia, the elastic element structure can respond quickly, and push the movable adjuster 22 back to the predetermined adjustment position through elasticity, thereby ensuring the adjustment accuracy of the movable adjuster 22; 3. In addition, since it is set in the elastic limiting structure 3, it can avoid the movable adjuster 22 from hard collision with the second joint 23 when the tension and inclination are large, causing wear, thereby extending the service life of the movable adjuster 22.

[0047] The elastic limiting structure 3 may be implemented in various ways, and two examples are specifically provided below.

[0048] First, the elastic element of the elastic limiting structure 3 is an elastic cushion disposed on the inner wall of the second slot 223. The elastic cushion can be made of a highly elastic and wear-resistant material, such as silicone, rubber, or polyurethane. The elastic cushion can be fixed to the inner wall of the second slot 223 by gluing, embedding, or other methods.

[0049] The elastic element is set as an elastic cushion layer, which has a simple structure and low production cost, but has the following defects: the elastic force generated by the deformation of the elastic cushion layer under compression is difficult to be linear. Specifically, the material of the elastic cushion layer (such as silicone, rubber or polyurethane) itself has a nonlinear stress-strain relationship. When the cushion layer is squeezed by external force, the relationship between its deformation and the elastic force generated is often not a simple linear relationship, but exhibits certain nonlinear characteristics. In particular, when the elastic cushion layer is subjected to external force, not only lateral elastic deformation will occur, but plastic deformation or diffusion creep may also occur. These non-elastic deformations will further aggravate the nonlinear characteristics of the elastic force. The above-mentioned nonlinear elastic characteristics of the elastic pad make it possible for the limiting effect of the elastic pad to change when it is subjected to external forces of different magnitudes, resulting in unstable displacement or vibration of the movable regulator 22 during the sliding process, affecting the stability and reliability of the joint of the tension device. In addition, the nonlinear elasticity of the elastic pad will make the relationship between the tension and the deformation of the elastic pad complicated. It is difficult for the elastic pad to accurately provide the lateral sliding range of the movable regulator 22 relative to the second joint 23 through deformation, resulting in measurement errors when the tensile testing machine measures the coating interface bonding strength.

[0050] In this regard, this embodiment provides another implementation structure of the elastic limiting structure 3.

[0051] Second, the elastic element of the elastic limiting structure 3 is set as a spring 31. This implementation structure uses the spring 31 to replace the elastic cushion layer. As a common elastic element, the stress-strain relationship of the spring 31 is usually relatively linear. In particular, in this embodiment, the lateral sliding of the movable regulator 22 relative to the second joint 23 is a short-range movement. The linear elastic force characteristics of the spring 31 are more obvious, which can ensure that the movable regulator 22 produces a stable displacement during the sliding process, reduce vibration and instability, and enable the tensile testing machine to more accurately provide the lateral sliding range of the movable regulator 22 relative to the second joint 23 through the deformation of the spring 31 when measuring the coating interface bonding strength, thereby reducing measurement errors.

[0052] However, in this embodiment, the lateral sliding movement of the movable adjuster 22 relative to the second joint 23 is a short-range movement. In actual application, the maximum lateral movement range of the movable adjuster 22 is only 4-5 mm. The spring 31 needs to be positioned between the inner wall of the second slot 223 and the second protrusion 231. There are basically no springs 31 on the market that can meet such a short requirement while providing a large elastic force. Therefore, this embodiment is further improved as follows: the elastic limiting structure 3 also includes a movable hole 32 provided on the outer wall of the movable adjuster 22. The movable hole 32 extends through the second slot 223 and is threadedly connected to a knob 33. The knob 33 is connected to the spring 31. The spring 31 extends through the movable hole 32 into the second slot 223 and elastically abuts the second protrusion 231. By setting a movable hole 32 and threading the movable hole 32 with a knob 33, the spring 31 is installed in the second slot 223. Due to the presence of the movable hole 32, the lateral space that the second slot 223 can actually accommodate for installing the spring 31 is increased, and is not limited by the lateral movement range of the movable adjuster 22, so that a spring 31 with a high spring coefficient that provides sufficient elastic force under slight deformation can be set.

[0053] In order to increase the contact area between the spring 31 and the second protrusion 231 and make the process of the elastic limiting structure 3 elastically abutting the second protrusion 231 more smooth and reliable, in this embodiment, the end of the spring 31 away from the knob 33 is connected to a connecting plate, and the spring 31 abuts the second protrusion 231 through the connecting plate.

[0054] In addition, in this embodiment, the second shaft 224 is detachably provided through the second slot 223 and the second protrusion 231. Since the second joint 23 needs to be bonded to the specimen body 1 with a strong adhesive, due to the irreversibility of the adhesive, the second joint 23 bonded to the specimen body 1 will be scrapped and unusable after each test of the tensile testing machine. Therefore, by allowing the second shaft 224 to detachably pass through the second slot 223 and the second protrusion 231, a detachable connection between the movable adjuster 22 and the second joint 23 is achieved. After each test, only the second shaft 224 needs to be disassembled and pulled out of the second slot 223 and the second protrusion 231 to separate the second joint 23 from the movable adjuster 22. After the next test, only a new second joint 23 needs to be installed on the movable adjuster 22, thereby saving measurement costs.

[0055] Example 2:

[0056] A tensile testing machine comprises a clamping mechanism, a tensile device and a coating tensile detection assembly as shown in the first embodiment.

[0057] The above description is only a specific embodiment of the present invention, but the technical features of the present invention are not limited thereto. Any changes or modifications made by any technician in this field within the scope of the present invention are included in the patent scope of the present invention.

Claims

1. A coating tensile testing assembly, suitable for a tensile testing machine, comprising a clamping mechanism and a tensile device positioned above the clamping mechanism, characterized in that: The coating tensile testing assembly includes: A sample body (1) has a clamping portion (11) for clamping and positioning by a clamping mechanism, and a coating surface (12) for depositing a coating; A joint assembly (2), comprising: A first connector (21) for connecting to an output end of the tensioning device; A second joint (23) is used for gluing the coating deposited on the surface of the coating surface (12); The movable adjuster (22) has one end rotatably connected to the first joint (21) and the other end slidably connected to the second joint (23); the movable adjuster (22) is provided with a first adjustment surface (221) for the first joint (21) to rotatably abut against; the first joint (21) can rotate to abut against the first adjustment surface (221), thereby driving the movable adjuster (22) to slide laterally relative to the second joint (23).

2. The coating tensile testing assembly according to claim 1, wherein: One end of the first joint (21) close to the movable adjuster (22) is recessed inward to form a first slot (211), and a first shaft (212) is arranged in the first slot (211); one end of the movable adjuster (22) is provided with a first protrusion (222) for the first shaft (212) to rotatably pass through, and the other end is recessed inward to form a second slot (223), and a second shaft (224) perpendicular to the first shaft (212) is arranged in the second slot (223), and the second joint (23) is provided with a second protrusion (231) for the second shaft (224) to axially slide through.

3. The coating tensile testing assembly according to claim 2, wherein: The second clamping slot (223) is provided with an elastic limiting structure (3), wherein the elastic limiting structure (3) has an elastic element, and the elastic element is used to elastically abut the second protrusion (231) when the movable adjuster (22) slides laterally relative to the second protrusion (231).

4. The coating tensile testing assembly according to claim 3, wherein: The elastic element is an elastic pad layer arranged on the inner wall of the second clamping groove (223).

5. The coating tensile testing assembly according to claim 3, wherein: The elastic element is a spring (31).

6. The coating tensile testing assembly according to claim 3, wherein: The elastic limiting structure (3) comprises a movable hole (32) provided on the outer wall of the movable adjuster (22), the movable hole (32) passing through the second clamping slot (223) and being threadedly connected to a knob (33), a spring (31) being connected to the knob (33), and the spring (31) extending into the second clamping slot (223) through the movable hole (32) and elastically abutting against the second protrusion (231).

7. The coating tensile testing assembly according to claim 6, wherein: One end of the spring (31) away from the knob (33) is connected to a connecting plate.

8. The coating tensile testing assembly according to claim 2, wherein: The second shaft (224) is detachably provided through the second clamping slot (223) and the second protrusion (231).

9. The coating tensile force detection assembly according to any one of claims 2 to 8, characterized in that: The first shaft (212) is axially slidable and passes through a first protrusion (222); the second shaft (224) is rotatably passed through a second protrusion (231); and the second joint (23) is provided with a second adjustment surface (232) for the movable adjuster (22) to rotatably abut against.

10. A tensile testing machine, characterized in that: It comprises a coating tensile force detection assembly as described in any one of claims 1 to 9.

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