A paint performance test jig

Abstract

The utility model discloses a kind of coating performance test fixtures, including base, article table;Workpiece to be measured includes the special-shaped cover as bearing matrix and protective film attached to it, the two sides of special-shaped cover are respectively provided with inwardly recessed cambered surface;The two sides of base are respectively provided with installation slope, fixed rod is fixed on each installation slope, and fixed rod is rotatably provided with pressure arm;The end of pressure arm away from workpiece to be measured is connected with telescopic motor, and pressure arm is provided with the pressure part of cambered surface adaptation on;Telescopic motor is used to drive pressure arm to rotate around fixed rod, to drive pressure part to be compacted on the cambered surface of special-shaped cover, and pressure sensor for monitoring compacting force is set on pressure part.The utility model is by setting the pressure part of cambered surface adaptation of special-shaped cover, and the pressure arm driven by telescopic motor, rotates around fixed rod, compacting force can be applied to the key arc-shaped part of special-shaped cover, and the design effectively overcomes the problem that positioning is not accurate, workpiece slips and the like caused by plane fixture unable to adhere to curved surface.

Description

Technical Field

[0001] This utility model particularly relates to a coating performance testing fixture. Background Technology

[0002] The design of electronic devices, home appliances, and other products is increasingly trending towards streamlined and integrated shapes, with a large number of irregularly shaped covers featuring complex curved surfaces and arc edges used as structural substrates. To improve the wear resistance, scratch resistance, and corrosion resistance of these substrates, as well as enhance their appearance, coating their surfaces with high-performance protective films has become a common industry practice. In actual use, protective films often need to withstand localized compressive stress during assembly or use. Their adhesion and durability under this stress directly determine the overall performance of the coating formulation. Therefore, in the research and development process, effectively simulating the compressive conditions of the protective film on the curved surfaces of irregularly shaped covers and objectively evaluating its deformation resistance has become a key step in optimizing coating formulations and improving product reliability. However, current test fixtures commonly used for evaluating protective film performance are mostly designed for planar substrates and are difficult to effectively adapt to irregularly shaped cover workpieces with curved surfaces or complex contours. Their main limitations in practical applications are as follows: The fixture based on the planar structure design cannot effectively fit the irregular curved surface of the cover, resulting in inaccurate positioning and easy slippage of the workpiece during the test, which seriously affects the test results. In addition, the existing temporary test methods (such as manual pressing) lack a unified clamping point positioning and force value monitoring mechanism, which cannot guarantee the consistency of clamping position and force value in different test cycles, resulting in high randomness of test data and failing to provide a reliable basis for the precise optimization of coating formulation. Utility Model Content

[0003] This utility model aims to solve at least one of the technical problems existing in the prior art. To this end, this utility model proposes a coating performance testing fixture: A coating performance testing fixture includes a base, with a platform for placing a workpiece to be tested located at the upper center of the base; the workpiece to be tested includes an irregularly shaped cover serving as a support base and a protective film attached thereto, with inwardly concave arc surfaces on both sides of the irregularly shaped cover; mounting inclined surfaces are provided on both sides of the base, and a fixing rod is fixed on each mounting inclined surface, with a pressure arm rotatably mounted on the fixing rod; a telescopic motor is connected to the end of the pressure arm away from the workpiece to be tested, and a pressing part adapted to the arc surface is provided on the pressure arm; the telescopic motor drives the pressure arm to rotate around the fixing rod, thereby causing the pressing part to press against the arc surface of the irregularly shaped cover, and a pressure sensor for monitoring the pressing force is provided on the pressing part.

[0004] Preferably, the pressure sensor is a piezoelectric ceramic sensor.

[0005] Preferably, a stroke block is fixed to the top of the fixed rod, and the pressure arm rotates relative to the fixed rod to abut against the stroke block to limit the rotation angle of the pressure arm.

[0006] Preferably, the shell of the irregularly shaped cover extends downward from the top through an arc-shaped transition area to form an annular side, and the contact surface of the pressing part matches and abuts against the contour of the arc-shaped transition area.

[0007] Preferably, the pressing part is recessed inward to form a groove, which is used to engage and press the annular side of the irregularly shaped cover.

[0008] Preferably, the shelf is symmetrically provided with mounting bases for placing the irregularly shaped cover.

[0009] Preferably, each pressure sensor is electrically connected to a display screen.

[0010] Compared with the prior art, the present invention has the following beneficial effects: This invention, by setting a pressure part adapted to the curved surface of an irregularly shaped cover and a pressure arm driven by a telescopic motor and rotating around a fixed rod, can apply clamping force to the key curved parts of the irregularly shaped cover. This design effectively overcomes the problems of inaccurate positioning and workpiece slippage caused by the inability of flat fixtures to fit curved surfaces, providing stable and reliable test conditions for performance evaluation of the protective film under stress, greatly improving the accuracy and repeatability of test results. In addition, this application also incorporates real-time feedback from a pressure sensor to monitor the magnitude of the clamping force in each test, completely solving the problem of random and unreproducible clamping force caused by temporary methods such as manual pressing. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in this embodiment, the accompanying drawings used in the embodiment will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 A schematic diagram of the structure of a coating performance testing fixture Figure 1 ; Figure 2 A schematic diagram of the structure of a coating performance testing fixture Figure 2 . Detailed Implementation

[0013] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.

[0014] The orientation shown in the accompanying drawings should not be construed as limiting the specific protection scope of this utility model, but is only for reference and understanding of preferred embodiments. The product components shown in the drawings can be changed in position, increased in number, or simplified in structure.

[0015] The “connection” described in the specification and the “connection” relationship between the components shown in the accompanying drawings can be understood as a fixed connection, a detachable connection, or a connection that forms an integral unit; it can be a direct connection or a connection through an intermediate medium. Those skilled in the art can understand the connection relationship according to the specific circumstances and can derive different implementation methods such as screwing, riveting, welding, snap-fitting, or embedding to suitably replace the connection.

[0016] The directional terms such as up, down, left, right, top, and bottom mentioned in the instruction manual and the directions shown in the attached drawings indicate that the components can directly contact each other or contact each other through other features; for example, "up" can mean directly above or diagonally above, or it simply means above other objects; other directions can be understood by analogy.

[0017] The materials used to manufacture solid-shaped parts as shown in the specification and drawings may be metallic, non-metallic, or other synthetic materials. The machining processes used for solid-shaped parts may include stamping, forging, casting, wire cutting, laser cutting, injection molding, CNC milling, 3D printing, machining, etc. Those skilled in the art may adapt or combine the above materials and manufacturing processes according to different processing conditions, costs, and precision requirements.

[0018] A coating performance testing fixture includes a base 1, with a platform 2 for placing a workpiece 3 to be tested at the upper center of the base 1; the workpiece 3 includes an irregularly shaped cover as a supporting substrate and a protective film attached thereto, with inwardly concave arc surfaces on both sides of the irregularly shaped cover; mounting inclined surfaces 4 are respectively provided on both sides of the base 1, and a fixing rod 5 is fixed on each mounting inclined surface 4, with a pressure arm 6 rotatably mounted on the fixing rod 5; a telescopic motor 7 is connected to the end of the pressure arm 6 away from the workpiece 3, and a pressing part 8 adapted to the arc surface is provided on the pressure arm 6; the telescopic motor 7 is used to drive the pressure arm 6 to rotate around the fixing rod 5, so as to drive the pressing part 8 to press against the arc surface of the irregularly shaped cover, and a pressure sensor 81 for monitoring the pressing force is provided on the pressing part 8.

[0019] Furthermore, the pressure sensor 81 is a piezoelectric ceramic sensor.

[0020] Furthermore, a travel block 51 is fixed to the top of the fixed rod 5, and the pressure arm 6 rotates relative to the fixed rod 5 to abut against the travel block 51 to limit the rotation angle of the pressure arm 6.

[0021] Furthermore, the shell of the irregularly shaped cover extends downward from the top through an arc-shaped transition area to form an annular side portion 821, and the contact surface of the pressing portion 8 matches and abuts against the contour of the arc-shaped transition area.

[0022] Furthermore, the pressing part 8 is recessed inward to form a groove 82, which is used to engage and press the annular side part 821 of the irregularly shaped cover.

[0023] Furthermore, the shelf 2 is symmetrically provided with mounting bases 9 for placing the irregularly shaped cover.

[0024] Furthermore, each pressure sensor 81 is electrically connected to a display screen.

[0025] The working principle of this utility model is as follows: See appendix Figure 1 The fixture mainly includes a base 1, with a platform 2 at the top center of the base 1. Mounting seats 9 are symmetrically arranged on the platform 2 for placing the workpiece 3 to be tested. The workpiece 3 consists of an irregularly shaped cover serving as a supporting base and a protective film attached to its outer surface. As an embodiment 1, the irregularly shaped cover of this application extends downwards from the top through an arc-shaped transition area to form an annular side portion 821. This arc-shaped transition area constitutes the arc surface that the fixture needs to press against.

[0026] Inclined mounting surfaces 4 are machined on both sides of the base 1. A fixing rod 5 is fixed to each mounting surface 4. A travel block 51 made of hard rubber is fastened to the top of the fixing rod 5 by screws, serving as a mechanical limit. A pressure arm 6 is rotatably mounted on the fixing rod 5 via a pivot, thus dividing the pressure arm 6 into a drive end and a pressure application end. The drive end of the pressure arm 6 is connected to a telescopic motor 7, and the pressure application end of the pressure arm 6 is equipped with a pressure section 8. A piezoelectric ceramic sensor is embedded inside the pressure section 8, and its signal line extends from inside the pressure arm 6 and can be electrically connected to a display screen for convenient and timely viewing of the pressure value.

[0027] The application scenario is as follows: During testing, the irregularly shaped cover covered with a protective film is placed on the mounting base 9 of the platform 2. The telescopic motor 7 drives the driving end of the corresponding pressure arm 6, which then rotates around the fixed rod 5, causing the pressure part 8 to approach the irregularly shaped cover. The slot 82 of the pressure part 8 first engages with the annular side 821 of the irregularly shaped cover, and then the working surface of the pressure part 8 adheres to the arc-shaped sidewall of the irregularly shaped cover. The telescopic motor 7 continues to push the pressure arm 6, and through the lever principle, a stable clamping force is finally formed on both sides of the irregularly shaped cover. Throughout the process, the piezoelectric ceramic sensor monitors the pressure data in real time to ensure the consistency of the test conditions on both sides of the irregularly shaped cover. After applying the predetermined clamping force and maintaining it for a specified time, the pressure is released, and the irregularly shaped cover is removed. The state of the protective film in the pressure arc area is directly observed with the naked eye or an optical microscope. The assessment focuses on whether irreversible indentations, wrinkles, and microcracks appear, and whether phenomena such as peeling or blistering of the protective film from the substrate occur. This morphological observation is the direct basis for assessing the mechanical strength and adhesion of the protective film, and can provide precise direction for optimizing key properties such as toughness and adhesion of the coating formulation.

[0028] Based on the above technical solution, the stroke block 51 provided at the top of the fixed rod 5 has the core function of mechanically limiting the maximum rotation angle of the pressure arm 6 and preventing the pressure arm 6 from interfering with other components due to excessive rotation.

[0029] This invention, by setting a pressure part 8 adapted to the curved surface of the irregularly shaped cover, and a pressure arm 6 driven by a telescopic motor 7 and rotating around a fixed rod 5, can apply clamping force to the key curved parts of the irregularly shaped cover. This design effectively overcomes the problems of inaccurate positioning and workpiece slippage caused by the inability of flat fixtures to fit curved surfaces, providing stable and reliable test conditions for the performance evaluation of the protective film under stress, greatly improving the accuracy and repeatability of test results. In addition, this application also incorporates real-time feedback from a pressure sensor 81, which can monitor the magnitude of the clamping force in each test, completely solving the problem of random and unreproducible clamping force caused by temporary methods such as manual pressing.

[0030] Although the present invention has been described in detail with reference to the above embodiments, it will be apparent to those skilled in the art that various changes or modifications can be made to the present invention without departing from the principles and spirit of the present invention as defined by the claims. Therefore, the detailed description of the embodiments in this disclosure is for explanation only and not for limiting the present invention, but rather the scope of protection is defined by the content of the claims.

Claims

1. A coating performance testing fixture, characterized in that, The device includes a base (1), and a platform (2) for placing a workpiece (3) to be tested is provided at the upper middle part of the base (1). The workpiece (3) to be tested includes a shaped cover as a supporting base and a protective film attached thereto. The two sides of the shaped cover are respectively provided with inwardly concave arc surfaces. The two sides of the base (1) are respectively provided with mounting inclined surfaces (4). Each mounting inclined surface (4) is fixed with a fixing rod (5). A pressure arm (6) is rotatably provided on the fixing rod (5). The end of the pressure arm (6) away from the workpiece (3) to be tested is connected to a telescopic motor (7). The pressure arm (6) is provided with a pressing part (8) adapted to the arc surface. The telescopic motor (7) is used to drive the pressure arm (6) to rotate around the fixing rod (5) so as to drive the pressing part (8) to press against the arc surface of the shaped cover. The pressing part (8) is provided with a pressure sensor (81) for monitoring the pressing force.

2. The coating performance testing fixture according to claim 1, characterized in that, The pressure sensor (81) is a piezoelectric ceramic sensor.

3. The coating performance testing fixture according to claim 1, characterized in that, A stroke block (51) is fixed to the top of the fixed rod (5), and the pressure arm (6) rotates relative to the fixed rod (5) to abut against the stroke block (51) to limit the rotation angle of the pressure arm (6).

4. A coating performance testing fixture according to claim 1, characterized in that, The shell of the irregularly shaped cover extends downward from the top through an arc-shaped transition area to form an annular side (821), and the contact surface of the pressing part (8) matches and abuts the contour of the arc-shaped transition area.

5. A coating performance testing fixture according to claim 4, characterized in that, The pressing part (8) is recessed inward to form a groove (82), which is used to engage and press the annular side (821) of the irregular cover.

6. A coating performance testing fixture according to claim 1, characterized in that, The shelf (2) is symmetrically provided with mounting bases (9) for placing the irregularly shaped cover.

7. A coating performance testing fixture according to claim 1, characterized in that, Each pressure sensor (81) is electrically connected to a display screen.

Images