An anodic conversion film voltage withstand performance testing device and method

Abstract

The present invention relates to the field of testing the voltage withstand performance of anodic conversion films, and specifically relates to a device and method for testing the voltage withstand performance of anodic conversion films. It includes a temperature control box, a pressurizing mechanism, and an optical microscope. A pressure measurement platform is also provided in the temperature control box. The pressurizing mechanism includes a pressure plate and a pressurizing drive assembly. The pressurizing mechanism further includes a rubber pressure sleeve fixedly sleeved on the pressure plate and a expansion assembly capable of expanding the rubber pressure sleeve. A pressure maintaining structure is provided in the rubber pressure sleeve to prevent insufficient contact between the rubber pressure sleeve and the sample. In the present invention, the expansion assembly drives the rubber pressure sleeve to deform, causing it to expand synchronously in multiple directions to ensure uniform pressure on the entire sample. At the same time, the pressure maintaining structure is activated to avoid the situation of insufficient contact between the rubber pressure sleeve and the sample, further improving the pressure uniformity.

Description

Technical Field

[0001] The present invention relates to the field of testing the voltage resistance performance of anodic conversion films, and specifically relates to a device and method for testing the voltage resistance performance of anodic conversion films. Background Art

[0002] Anodizing technology is a material protection technology in which metal materials form an oxide film on their surfaces by applying an external anodic current in an electrolyte solution, also known as surface anodizing. After the metal materials or products are subjected to surface anodizing treatment, a film will appear on the surface, which becomes an anodic conversion film. In order to understand the strength or heat resistance of the material after electrophoretic coating, it is necessary to test it.

[0003] In the existing testing device during the voltage resistance test, local stress concentration is likely to occur at some parts of the sample. This leads to distortion of the test results and cannot accurately reflect the overall performance of the anodic conversion film.

[0004] A device for testing the performance of anodic conversion films in an electrophoretic coating process, with the publication number of CN217901410U in the currently publicly disclosed Chinese patents, includes a pressure measurement unit: installed at the front end inside the temperature control box; the pressure measurement unit includes an L-shaped guide bar, a pushing frame, a vertical sliding angle plate, and a pressure sensor. Two L-shaped guide bars are installed at the front end inside the temperature control box. The front and rear ends of the pushing frame are respectively slidably connected to the two L-shaped guide bars. The vertical sliding angle plate is slidably connected to the middle of the pushing frame. The pressure sensor is installed on the left side of the front end of the pressure table. By moving the pushing frame left and right, the parts after electrophoretic coating on the vertical sliding angle plate can be moved, facilitating temperature resistance testing and voltage resistance testing. During the voltage resistance test, the vertical sliding angle plate can move up and down to better adhere to the upper end of the pressure sensor; the pressure measurement unit also includes a fixed rod seat and a hydraulic rod. The fixed rod seat is installed on the upper side of the right end of the temperature control box. The hydraulic rod is installed at the lower end of the fixed rod seat. The telescopic end of the hydraulic rod is connected to a pressure plate. By using the operation of the hydraulic rod, the pressure plate can press the anodic conversion film of the parts after electrophoretic coating, facilitating the testing of the voltage resistance strength.

[0005] According to the above patent, by moving the pushing frame left and right, the parts after electrophoretic coating on the vertical sliding angle plate can be moved, facilitating temperature resistance testing and voltage resistance testing. During the voltage resistance test, the vertical sliding angle plate can move up and down to better adhere to the upper end of the pressure sensor. However, in the comparative document, the pressing method cannot adapt the pressure plate to the sample. The shape and size of the pressure plate may not be suitable for all types of samples. If the contact between the pressure plate and the sample surface is uneven, it will lead to too large or too small local pressure, affecting the accuracy of the test results. Therefore, there is currently a need for a device for testing the voltage resistance performance of anodic conversion films that can adjust the size of the pressure plate to meet the needs of adapting to different sizes of samples. Summary of the Invention

[0006] In view of the problems existing in the prior art, a device for testing the pressure resistance of an anodic conversion film is provided. The device drives the rubber sleeve to deform through an expansion component, causing it to expand synchronously in multiple directions to ensure that the sample is pressurized uniformly as a whole. At the same time, the pressure-maintaining structure is activated to avoid insufficient contact between the rubber sleeve and the sample, thereby further improving the uniformity of pressure.

[0007] In order to solve the problems of the prior art, the present invention provides a device for testing the pressure resistance performance of an anodic conversion film, comprising a temperature-controlled box and a pressure-applying mechanism arranged therein for applying pressure to a sample, and an optical microscope for observing the pressure state of the anodic conversion film on the surface of the sample. A pressure measuring platform for placing the sample is also provided in the temperature-controlled box and below the pressure-applying mechanism. A frame for installing the pressure-applying mechanism is provided in the temperature-controlled box. The pressure-applying mechanism comprises a pressure plate and a pressure-applying driving component arranged on the frame for driving the pressure plate. When the pressure-applying driving component drives the pressure plate, the pressure plate is in a state of vertically applying pressure to the upper surface of the sample. The pressure-applying mechanism also comprises a rubber pressure sleeve fixedly arranged on the pressure plate and an expansion component capable of expanding the rubber pressure sleeve. When the expansion component drives the rubber pressure sleeve, the rubber pressure sleeve is in a deformed state, so that the sample is evenly pressurized as a whole. A pressure-maintaining structure for avoiding insufficient contact between the rubber pressure sleeve and the sample is provided in the rubber pressure sleeve. When the rubber pressure sleeve applies pressure to the sample, the pressure-maintaining structure is synchronously started, so that the rubber pressure sleeve further applies pressure to the sample.

[0008] Preferably, the pressurized drive assembly includes a fixed plate fixedly mounted on a frame, a movable plate slidably mounted on the frame, and a pneumatic rod fixedly mounted on the fixed plate for driving the movable plate. The movable plate is fixedly connected to the pressure plate, and a pressure buffer structure is provided between the pneumatic rod and the movable plate for maintaining stable pressure during the process of applying pressure to the pressure plate.

[0009] Preferably, the pressure maintaining structure has a pressurized chamber body, which is a flexible structure. A pressure charging chamber is formed between the pressurized chamber body and the pressure plate. A pressure charging tube connected to the pressure charging chamber is fixedly connected between the movable plate and the pressure plate. The pressure charging tube is provided with a valve for automatically opening the pressure charging tube to supply air to the pressure charging chamber after the rubber pressure sleeve is pressurized.

[0010] Preferably, a rubber ring sleeve is provided in the rubber compression sleeve and is transmission-connected to the expansion assembly. When the expansion assembly is started, the rubber ring sleeve is in an overall expanded state, so that the rubber compression sleeve is in a synchronously expanded state under the push of the rubber ring sleeve.

[0011] Preferably, the expansion assembly includes a plurality of sliding frames evenly distributed along the circumferential direction of the pressure plate and a linear drive for driving all the sliding frames to move outward synchronously. Each sliding frame can move along its radial direction on the pressure plate, and each sliding frame is also fixedly connected to the rubber pressure sleeve.

[0012] Preferably, at the position of the inner part of the rubber pressing sleeve corresponding to each sliding bracket, a first arc-shaped block fixedly connected thereto is provided. A second arc-shaped block is slidably clamped between every two adjacent first arc-shaped blocks. The first arc-shaped block has a sliding groove for slidingly cooperating with the second arc-shaped block. The first arc-shaped block and the second arc-shaped block are coaxial with the pressing disc. Each first arc-shaped block is located above the rubber ring sleeve and has a shape matching that of the rubber ring sleeve. Each second arc-shaped block abuts against the inner side of the rubber ring sleeve. The first arc-shaped block and the second arc-shaped block surround the rubber ring sleeve from above and inside, capable of preventing the rubber ring sleeve from tilting upward while pushing the rubber ring sleeve, thereby realizing uniform and stable expansion of the rubber replacement sleeve. When the first arc-shaped block moves outward following the sliding bracket, the second arc-shaped block is synchronously in a state of moving outward, causing the rubber ring sleeve to drive the rubber pressing sleeve to be in a state of overall expansion.

[0013] Preferably, the linear driver has a sliding sleeve slidably sleeved on the pressure charging pipe and a connecting rod hinged between each sliding bracket and the sliding sleeve. A ball is rotatably provided on the pressing disc and in rolling contact with each sliding bracket. When the sliding sleeve moves downward relative to the pressing disc, the connecting rod is in a state of pushing the sliding bracket outward.

[0014] Preferably, a first return spring is fixedly connected between the sliding sleeve and the pressing disc. When the sliding sleeve is not activated, the first return spring is in an uncompressed state.

[0015] Preferably, the valve has a valve stem inserted into the pressure charging pipe and a valve sleeve sleeved on the valve stem and fixed to the pressure charging pipe. The inner diameter of the valve sleeve gradually decreases from top to bottom and is in an inverted conical shape. The lower end of the valve stem has a lower end head fixedly connected to the bottom of the pressure charging cavity body. The upper end of the valve stem has an upper end head fitting with the valve sleeve. The part where the upper end head fits with the valve sleeve is in a conical structure. When the rubber pressing sleeve squeezes the sample, the upper end head of the valve stem gradually moves away from the valve sleeve, causing a gap for the gas supply source to enter the pressure charging cavity to be formed between the valve stem and the valve sleeve. A second return spring is fixedly connected between the lower end head and the bottom surface of the pressure charging pipe. When the upper end head contacts the valve sleeve, the second return spring is in an uncompressed state.

[0016] The present invention also provides a method for testing the voltage resistance performance of an anodic conversion film, including the following steps:

[0017] S1. Place the sample on the pressure measuring platform in the temperature control box and set the temperature;

[0018] S2. Start the expansion assembly to drive the rubber pressing sleeve to expand uniformly in multiple directions until the rubber pressing sleeve fits the sample;

[0019] S3. Start the pressure pressing drive assembly to drive the pressing disc to move downward, causing the rubber pressing sleeve to press the sample;

[0020] S4. After the pressure sensor platform senses that the pressure on the sample reaches the specified level, the pressurization driving component stops moving and maintains the pressurized state on the sample.

[0021] S5. The operator observes and records the changes in the anodic conversion film on the sample surface after being pressurized through a microscope.

[0022] The beneficial effects of this application compared with the prior art are as follows:

[0023] 1. In the present invention, the expansion component drives the rubber pressing sleeve to deform, causing it to expand uniformly in multiple directions to ensure uniform pressure on the entire sample. As the pressing plate applies a vertical pressure to the upper surface of the sample, during the descent of the pressing plate, the rubber pressing sleeve gradually applies pressure to the sample. At the same time, the pressure maintaining structure inside the rubber pressing sleeve is activated to avoid insufficient contact between the rubber pressing sleeve and the sample.

[0024] After the pressing plate applies pressure to the sample at each predetermined pressure, the operator observes and records the changes on the sample surface through a microscope, and records the state of the anodic conversion film at each pressure value respectively. Until all the predetermined pressure value tests are completed, the pressure resistance performance of the anodic conversion film under different pressures can be obtained.

[0025] 2. When the rubber pressing sleeve in the present invention contacts the sample and starts to apply pressure, the valve automatically opens the inflation path of the pressure charging pipe, and the gas pressure in the pressure charging cavity gradually increases, causing the pressure charging chamber to apply pressure to the rubber pressing sleeve.

[0026] The uniformity and stability of the contact between the rubber pressing sleeve and the sample surface are maintained, effectively preventing inaccuracies in the pressure resistance performance test of the anodic conversion film caused by local pressure unevenness, and improving the accuracy and reliability of the test.

[0027] 3. The expansion component in the present invention drives the overall expansion of the rubber ring sleeve, causing the rubber pressing sleeve to enter the expansion state synchronously to ensure uniform expansion in multiple directions. Thus, when the rubber pressing sleeve contacts the sample surface, it can apply pressure evenly to ensure that the rubber pressing sleeve applies pressure to the entire sample.

[0028] The uniformity and consistency of the force on the sample during the test are ensured, and the reliability and accuracy of the test results are improved. Description of the Drawings

[0029] Figure 1 is a three-dimensional structural schematic diagram of a device for testing the pressure resistance performance of an anodic conversion film of the present invention.

[0030] Figure 2 is a three-dimensional structural sectional view of a device for testing the pressure resistance performance of an anodic conversion film of the present invention.

[0031] Figure 3It is a three-dimensional structural schematic diagram of a device for testing the voltage resistance performance of an anodic conversion film of the present invention, excluding the temperature control box.

[0032] Figure 4 It is a cross-sectional view of the three-dimensional structure of a device for testing the voltage resistance performance of an anodic conversion film of the present invention, excluding the temperature control box.

[0033] Figure 5 It is a partial three-dimensional structural schematic diagram of the pressurizing mechanism of a device for testing the voltage resistance performance of an anodic conversion film of the present invention.

[0034] Figure 6 It is a partial cross-sectional view of the three-dimensional structure of the pressurizing mechanism of a device for testing the voltage resistance performance of an anodic conversion film of the present invention.

[0035] Figure 7 It is Figure 4 an enlarged schematic view of part A.

[0036] Figure 8 It is a three-dimensional structural schematic diagram of the rubber pressure sleeve and expansion assembly of a device for testing the voltage resistance performance of an anodic conversion film of the present invention.

[0037] Figure 9 It is a three-dimensional structural schematic diagram of the expansion assembly of a device for testing the voltage resistance performance of an anodic conversion film of the present invention Figure 1 .

[0038] Figure 10 It is a three-dimensional structural schematic diagram of the expansion assembly of a device for testing the voltage resistance performance of an anodic conversion film of the present invention Figure 2 .

[0039] The reference numerals in the figure are: 1, temperature control box; 11, frame; 2, sample; 3, pressurizing mechanism; 31, pressure plate; 311, ball; 32, pressurizing drive assembly; 321, fixing plate; 3211, pneumatic rod; 322, movable plate; 33, rubber pressure sleeve; 34, expansion assembly; 341, rubber ring sleeve; 3411, first arc-shaped block; 3412, second arc-shaped block; 342, sliding frame; 343, linear drive; 3431, sliding sleeve; 3432, connecting rod; 3433, first return spring; 4, pressure measurement platform; 5, pressure holding structure; 51, pressurizing chamber body; 52, pressure charging pipe; 53, valve; 531, valve stem; 5311, lower end head; 5312, upper end head; 5313, second return spring; 532, valve sleeve; 6, pressure buffer structure. Detailed implementation manners

[0040] To further understand the features, technical means, and specific purposes and functions achieved by the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0041] See Figures 1 - 6As shown in the figure, a device for testing the voltage withstand performance of an anodic conversion film includes a temperature control box 1, a pressurizing mechanism 3 arranged therein for pressing a sample 2, and an optical microscope for observing the pressure state of the anodic conversion film on the surface of the sample 2. A pressure measurement platform 4 for placing the sample 2 is further provided in the temperature control box 1 and below the pressurizing mechanism 3. A frame 11 for installing the pressurizing mechanism 3 is provided in the temperature control box 1. The pressurizing mechanism 3 includes a pressure plate 31 and a pressurizing drive assembly 32 arranged on the frame 11 for driving the pressure plate 31. When the pressurizing drive assembly 32 drives the pressure plate 31, the pressure plate 31 is in a state of vertically pressing the upper surface of the sample 2. The pressurizing mechanism 3 further includes a rubber pressure sleeve 33 fixedly sleeved on the pressure plate 31 and an expansion assembly 34 capable of expanding the rubber pressure sleeve 33. When the expansion assembly 34 drives the rubber pressure sleeve 33, the rubber pressure sleeve 33 is in a deformed state, making the overall pressure on the sample 2 uniform. A pressure maintaining structure 5 for preventing the rubber pressure sleeve 33 from insufficient contact with the sample 2 is provided in the rubber pressure sleeve 33. When the rubber pressure sleeve 33 presses the sample 2, the pressure maintaining structure 5 is started synchronously, so that the rubber pressure sleeve 33 further presses on the sample 2.

[0042] The optical microscope is not shown in the figure.

[0043] When the test of the voltage withstand performance of the anodic conversion film starts, first place the sample 2 on the pressure measurement platform 4 in the temperature control box 1. Next, the operator sets the temperature of the temperature control box 1 to simulate different working environment conditions to ensure the accuracy and reliability of the test results.

[0044] When the temperature control box 1 reaches the predetermined temperature, the operator starts the pressurizing mechanism 3. The pressurizing drive assembly 32 applies a vertical pressure to the upper surface of the sample 2.

[0045] Before the rubber pressure sleeve 33 contacts the sample 2, the expansion assembly 34 is started to drive the rubber pressure sleeve 33 to deform. So that the rubber pressure sleeve 33 can expand uniformly in multiple directions to ensure the overall pressure on the sample 2 is uniform. The rubber pressure sleeve 33 first contacts the surface of the sample 2, playing a role of preliminary pressure test. As the pressure plate 31 continues to descend, the rubber pressure sleeve 33 is further compressed. This process can not only avoid damage to the sample 2 caused by excessive local pressure, but also ensure the uniformity and consistency of the test results.

[0046] At the same time, the pressure maintaining structure 5 inside the rubber pressure sleeve 33 is started. To avoid the situation of insufficient contact between the rubber pressure sleeve 33 and the sample 2.

[0047] When the pressure plate 31 reaches the predetermined lowest position, that is, when the pressure measurement platform 4 senses that the pressure on the sample 2 reaches the specified degree, the pressurizing drive assembly 32 stops moving and maintains for a period of time to ensure that the sample 2 is fully pressed. After the test of a pressure value is completed, the pressurizing drive assembly 32 moves in the reverse direction to slowly raise the pressure plate 31, and the rubber pressure sleeve 33 gradually returns to its original state.

[0048] Subsequently, the operator observes and records the changes on the surface of Sample 2 through a microscope. The high-magnification lens of the microscope clearly shows the microstructural changes of the anodic conversion film, such as the formation and development of cracks, the deformation of the film layer, etc. To ensure the comprehensiveness and accuracy of the test, the pressure value is usually increased step by step, with a small increment each time, and the state of Sample 2 at each pressure value is recorded. The above process is repeated continuously until all the predetermined pressure value tests are completed. To understand in detail the pressure resistance performance of the anodic conversion film under different pressures. Through the analysis of the data, the pressure resistance performance of the anodic conversion film under different pressures can be obtained, and its reliability and stability in practical applications can be evaluated.

[0049] See Figures 1 - 6 As shown, the pressurizing drive assembly 32 includes a fixed plate 321 fixedly arranged on the frame body 11, a movable plate 322 slidably arranged on the frame body 11, and a pneumatic rod 3211 fixedly arranged on the fixed plate 321 for driving the movable plate 322. The movable plate 322 is fixedly connected to the pressure plate 31. A pressure buffer structure 6 is provided between the pneumatic rod 3211 and the movable plate 322 to keep the pressure stable during the process of pressing the pressure plate 31.

[0050] When the pneumatic rod 3211 pushes the movable plate 322 to move downward, the pressure buffer structure 6 effectively absorbs the pressure fluctuation, ensuring that the pressure applied by the pressure plate 31 to Sample 2 remains stable throughout the pressurizing process. This not only helps to improve the accuracy and reliability of the test, but also reduces the damage to Sample 2 that may be caused by sudden pressure changes, and prolongs the service life of Sample 2.

[0051] When the pressure plate 31 reaches the predetermined lowest position, that is, when the pressure measuring platform 4 senses that the pressure on Sample 2 reaches the specified degree, the pressurizing drive assembly 32 stops moving and maintains for a period of time to ensure that Sample 2 is fully pressurized. After the test of one pressure value is completed, the pneumatic rod 3211 moves in the reverse direction, causing the movable plate 322 to drive the pressure plate 31 to rise slowly, and the rubber pressure sleeve 33 gradually returns to its original state.

[0052] See Figures 1 - 6 As shown, the pressure maintaining structure 5 has a pressurizing chamber body 51. The pressurizing chamber body 51 is a flexible structure. An air charging cavity is formed between the pressurizing chamber body 51 and the pressure plate 31. A charging pipe 52 communicating with the air charging cavity is fixedly connected between the movable plate 322 and the pressure plate 31. A valve 53 is provided in the charging pipe 52 to automatically open the charging pipe 52 to supply gas into the air charging cavity after the rubber pressure sleeve 33 is pressurized.

[0053] When the rubber pressure sleeve 33 contacts Sample 2 and starts to apply pressure, the pressurizing chamber body 51, as a flexible structure, will deform accordingly with the deformation of the rubber pressure sleeve 33.

[0054] The pressure chamber formed between the pressurized chamber body 51 and the pressure plate 31 is not filled with gas in the initial state. As the rubber compression sleeve 33 is further compressed, the valve 53 automatically opens the inflation path of the pressure charging tube 52. The gas pressure in the pressure charging chamber gradually increases, so that the pressurized chamber body 51 applies pressure to the rubber compression sleeve 33, which helps to maintain the uniformity and stability of the contact between the rubber compression sleeve 33 and the surface of the sample 2, and improves the accuracy and reliability of the test.

[0055] See also Figures 4 - 6 and Figures 8 - 10 As shown, a rubber sleeve 341 is provided in the rubber sleeve 33 and is transmission-connected to the expansion assembly 34 . When the expansion assembly 34 is started, the rubber sleeve 341 is in an overall expanded state, so that the rubber sleeve 33 is in a synchronously expanded state under the push of the rubber sleeve 341 .

[0056] When the expansion assembly 34 is activated, the rubber sleeve 341 is driven to expand as a whole. As the rubber sleeve 341 expands, the diameter of the rubber sleeve 341 gradually increases, so that the rubber sleeve 341 is in a stretched state. Since the rubber sleeve 341 is arranged inside the rubber compression sleeve 33, the expansion of the rubber sleeve 341 can drive the rubber compression sleeve 33 to expand synchronously. That is, the rubber compression sleeve 33 is pushed from the inside to the outside by the rubber sleeve 341, so that the rubber compression sleeve 33 is also in a stretched state, ensuring uniform expansion in multiple directions.

[0057] Synchronous expansion enables the rubber compression sleeve 33 to apply pressure evenly when it contacts the surface of the sample 2, ensuring that the rubber compression sleeve 33 applies pressure to the entire sample 2. This ensures the uniformity and consistency of the force applied to the sample 2 during the test, and improves the reliability and accuracy of the test results.

[0058] See also Figures 4 - 6 and Figures 8 - 10 As shown, the expansion assembly 34 includes a plurality of sliding frames 342 evenly distributed along the circumferential direction of the pressure plate 31 and a linear drive 343 for driving all the sliding frames 342 to move outward synchronously. Each sliding frame 342 can move along its radial direction on the pressure plate 31, and each sliding frame 342 is also fixedly connected to the rubber pressure sleeve 33.

[0059] When the expansion assembly 34 is started, the linear drive 343 drives the plurality of slide frames 342 to move outward synchronously. Since each slide frame 342 is fixedly connected to the rubber compression sleeve 33, each slide frame 342 moves along the radial direction of the pressure plate 31 and drives the rubber compression sleeve 33 to expand.

[0060] It ensures that the rubber pressure sleeve 33 can apply pressure evenly when it contacts the surface of the sample 2, thereby ensuring the uniformity and consistency of the force applied to the sample 2 during the test, and improving the reliability and accuracy of the test results.

[0061] See Figures 4 - 6 and Figures 8 - 10 As shown, at the position inside the rubber compression sleeve 33 corresponding to each sliding frame 342, there is a first arc-shaped block 3411 fixedly connected thereto. A second arc-shaped block 3412 is slidably clamped between every two adjacent first arc-shaped blocks 3411. The first arc-shaped block 3411 has a chute for slidably cooperating with the second arc-shaped block 3412. The first arc-shaped block 3411 and the second arc-shaped block 3412 are coaxial with the pressure plate 31. Each first arc-shaped block 3411 is located above the rubber ring sleeve 341 and has a shape matching that of the rubber ring sleeve 341. Each second arc-shaped block 3412 abuts against the inner side of the rubber ring sleeve 341. The first arc-shaped block 3411 and the second arc-shaped block 3412 surround the rubber ring sleeve 341 from above and inside, capable of preventing the rubber ring sleeve 341 from tilting upward while pushing the rubber ring sleeve 341, thereby realizing uniform and stable expansion of the rubber ring sleeve 341. When the first arc-shaped block 3411 moves outward following the sliding frame 342, the second arc-shaped block 3412 is synchronously in a state of moving outward, causing the rubber ring sleeve 341 to drive the rubber compression sleeve 33 into an overall expanded state.

[0062] When the linear actuator 343 is activated, it drives all the sliding frames 342 to move outward synchronously. Since each sliding frame 342 is fixedly connected to a first arc-shaped block 3411, when the sliding frame 342 moves outward, the first arc-shaped block 3411 also moves outward accordingly. The outward movement of the first arc-shaped block 3411 will push the second arc-shaped block 3412 to move outward synchronously through the chute, ensuring that the second arc-shaped block 3412 can closely follow the movement of the first arc-shaped block 3411 and maintaining the consistency of the entire movement.

[0063] With the outward movement of the first arc-shaped block 3411 and the second arc-shaped block 3412, the edges of the first arc-shaped block 3411 and the second arc-shaped block 3412 will exert an outward pressure on the rubber ring sleeve 341. After the rubber ring sleeve 341 is subjected to this pressure, it will gradually expand, thereby driving the rubber compression sleeve 33 to expand outward as a whole. This enables the rubber compression sleeve 33 to expand uniformly in multiple directions, ensuring that when it contacts the surface of the sample 2, it can apply pressure comprehensively, improving the uniformity and stability of the pressure applied to the sample 2.

[0064] See Figures 4 - 6 and Figures 8 - 10 As shown, the linear actuator 343 has a sliding sleeve 3431 slidably sleeved on the pressure tube 52 and a connecting rod 3432 hinged between each sliding frame 342 and the sliding sleeve 3431. The pressure plate 31 is rotatably provided with balls 311 that rollingly contact each sliding frame 342. When the sliding sleeve 3431 moves downward relative to the pressure plate 31, the connecting rod 3432 is in a state of pushing the sliding frame 342 outward.

[0065] When the linear actuator 343 is activated, the sliding sleeve 3431 moves downward relative to the pressure plate 31. The downward movement of the sliding sleeve 3431 is transmitted to each sliding carriage 342 through the articulated connecting rod 3432. Since one end of the connecting rod 3432 is articulated to the sliding sleeve 3431 and the other end is articulated to the sliding carriage 342, when the sliding sleeve 3431 moves downward, the connecting rod 3432 forms a lever effect to push the sliding carriage 342 outward. This ensures that all the sliding carriages 342 move synchronously, avoiding skewing or jamming caused by inconsistent movement of a single sliding carriage 342.

[0066] When the sliding carriage 342 moves outward, it slides radially outward from the center of the pressure plate 31. To ensure smooth movement of the sliding carriage 342, a plurality of balls 311 are provided on the pressure plate 31, greatly reducing the friction between the sliding carriage 342 and the pressure plate 31, enabling the sliding carriage 342 to move outward more smoothly. As the sliding carriage 342 moves outward, the first arc-shaped block 3411 fixed thereto also moves outward accordingly.

[0067] See Figures 4 - 10 As shown, a first return spring 3433 is fixedly connected between the sliding sleeve 3431 and the pressure plate 31. When the sliding sleeve 3431 is not activated, the first return spring 3433 is in an uncompressed state.

[0068] When the linear actuator 343 stops operating, the first return spring 3433 pushes the sliding sleeve 3431 upward to reset. The upward movement of the sliding sleeve 3431 pulls the sliding carriage 342 back to the retracted state through the connecting rod 3432, causing the first arc-shaped block 3411 and the second arc-shaped block 3412 to return to their initial positions, and the rubber ring sleeve 341 and the rubber pressing sleeve 33 also contract accordingly.

[0069] With the contraction of the rubber ring sleeve 341 and the rubber pressing sleeve 33, it is ensured that the rubber ring sleeve 341 and the rubber pressing sleeve 33 can return to their initial states after each operation, preparing for the next operation and facilitating changes according to samples 2 of different sizes.

[0070] See Figures 4 - 10As shown in the figure, the valve 53 has a valve stem 531 inserted into the pressurizing pipe 52 and a valve sleeve 532 sleeved on the valve stem 531 and fixed to the pressurizing pipe 52. The inner diameter of the valve sleeve 532 gradually decreases from top to bottom and is in an inverted conical shape. The lower end of the valve stem 531 has a lower end head 5311 fixedly connected to the inner bottom of the pressurizing chamber body 51. The upper end of the valve stem 531 has an upper end head 5312 that fits with the valve sleeve 532. The part where the upper end head 5312 fits with the valve sleeve 532 is a conical structure. When the rubber pressing sleeve 33 presses the sample 2, the upper end head 5312 of the valve stem 531 gradually moves away from the valve sleeve 532, so that a gap for the gas supply source to enter the pressurizing chamber is formed between the valve stem 531 and the valve sleeve 532. A second return spring 5313 is fixedly connected between the lower end head 5311 and the bottom surface of the pressurizing pipe 52. When the upper end head 5312 contacts the valve sleeve 532, the second return spring 5313 is in an uncompressed state.

[0071] When the rubber pressing sleeve 33 presses the sample 2, as the pressing plate 31 continues to press down, the rubber pressing sleeve 33 deforms, the valve stem 531 is stationary relative to the sample 2, and the pressing plate 31 is movable relative to the valve stem 531. Since the pressurizing pipe 52 is fixedly arranged on the pressing plate 31 and the valve sleeve 532 is fixedly arranged in the pressurizing pipe 52, the valve sleeve 532 moves downward relative to the valve stem 531. At this time, the upper end head 5312 of the valve stem 531 gradually separates from the valve sleeve 532, thereby gradually opening the gap for the gas supply source to enter the pressurizing chamber. At this time, the second return spring 5313 begins to be compressed. After the rubber pressing sleeve 33 stops pressing the sample 2, the second return spring 5313 will help the valve stem 531 to quickly reset. When the second return spring 5313 reaches the maximum compression state, at this time, the maximum gap is formed between the upper end head 5312 of the valve stem 531 and the valve sleeve 532, and the channel between the gas source and the pressurizing chamber is completely opened, and the gas can flow freely.

[0072] When the second return spring 5313 pushes the valve stem 531 to reset downward, the upper end head 5312 of the valve stem 531 contacts the valve sleeve 532 tightly again, closing the channel between the gas source and the pressurizing chamber. The second return spring 5313 returns to the uncompressed state, ensuring that the valve 53 returns to the initial closed state.

[0073] A method for testing the voltage withstand performance of an anodic conversion film, which is applied to a device for testing the voltage withstand performance of an anodic conversion film, includes the following steps:

[0074] S1. Place the sample 2 on the pressure measurement platform 4 in the temperature control box 1 and set the temperature;

[0075] S2. Start the expansion component to drive the rubber pressing sleeve 33 to expand uniformly in multiple directions until the rubber pressing sleeve 33 fits with the sample 2;

[0076] S3. Start the pressurizing drive assembly 32 to drive the pressure plate 31 to move downward, prompting the rubber pressure sleeve 33 to apply pressure to the sample 2;

[0077] S4. After the pressure measuring platform 4 senses that the pressure on the sample 2 reaches the specified level, the pressurizing drive assembly 32 stops moving and maintains the pressure application state on the sample 2;

[0078] S5. The operator observes and records the changes on the surface of the anodic conversion film of the sample 2 under pressure through a microscope.

[0079] In the present invention, the expansion assembly 34 drives the rubber pressure sleeve 33 to deform, causing it to expand synchronously in multiple directions to ensure uniform pressure on the entire sample 2. When the pressure plate 31 applies a vertical pressure to the upper surface of the sample 2, the rubber pressure sleeve 33 gradually applies pressure to the sample 2. At the same time, the pressure maintaining structure 5 inside the rubber pressure sleeve 33 is activated, avoiding the situation of insufficient contact between the rubber pressure sleeve 33 and the sample 2, and further improving the pressure uniformity.

[0080] After each time the pressure plate 31 applies pressure to the sample 2 at a predetermined pressure, the operator observes and records the state of the anodic conversion film on the surface of the sample 2 through a microscope. Until all the predetermined pressure value tests are completed, comprehensively understand the pressure resistance performance of the anodic conversion film under different pressures, ensuring the comprehensiveness and accuracy of the test.

[0081] The above embodiments only represent one or several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but should not be construed as limiting the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A device for testing the pressure resistance of an anodic conversion film, comprising a temperature-controlled box (1), a pressure-applying mechanism (3) arranged therein for applying pressure to a sample (2), and an optical microscope for observing the pressure state of the anodic conversion film on the surface of the sample (2); a pressure-measuring platform (4) for placing the sample (2) is also arranged in the temperature-controlled box (1) and below the pressure-applying mechanism (3); It is characterized in that A frame (11) for mounting the pressurizing mechanism (3) is provided in the temperature control box (1); The pressurizing mechanism (3) comprises a pressure plate (31) and a pressurizing drive assembly (32) arranged on the frame (11) and used to drive the pressure plate (31); When the pressure driving component (32) drives the pressure plate (31), the pressure plate (31) is in a state of applying vertical pressure to the upper surface of the sample (2); The pressurizing mechanism (3) further comprises a rubber pressing sleeve (33) fixedly mounted on the pressing plate (31) and an expansion component (34) capable of expanding the rubber pressing sleeve (33); When the expansion component (34) drives the rubber pressing sleeve (33), the rubber pressing sleeve (33) is in a deformed state, so that the sample (2) is evenly compressed as a whole; The rubber pressing sleeve (33) is provided with a pressure-maintaining structure (5) for preventing the rubber pressing sleeve (33) from having insufficient contact with the sample (2); when the rubber pressing sleeve (33) applies pressure to the sample (2), the pressure-maintaining structure (5) is started synchronously, so that the rubber pressing sleeve (33) further applies pressure to the sample (2); A rubber ring (341) is provided in the rubber pressing sleeve (33) and is transmission-connected to the expansion assembly (34). When the expansion assembly (34) is started, the rubber ring (341) is in an overall expanded state, so that the rubber pressing sleeve (33) is in a synchronously expanded state under the push of the rubber ring (341).

2. The pressure resistance performance testing device for anodic conversion film according to claim 1, characterized in that, The pressurizing drive assembly (32) comprises a fixed plate (321) fixedly mounted on the frame (11), a movable plate (322) slidably mounted on the frame (11), and a pneumatic rod (3211) fixedly mounted on the fixed plate (321) for driving the movable plate (322), wherein the movable plate (322) is fixedly connected to the pressure plate (31), and a pressure buffer structure (6) is provided between the pneumatic rod (3211) and the movable plate (322) for maintaining a stable pressure during the process of applying pressure to the pressure plate (31).

3. The anodic conversion film withstand voltage performance testing device according to claim 2, wherein, The pressure-maintaining structure (5) comprises a pressurizing chamber (51), wherein the pressurizing chamber (51) is a flexible structure, wherein a pressure chamber is formed between the pressurizing chamber (51) and the pressure plate (31), wherein a pressure-charging tube (52) in communication with the pressure chamber is fixedly connected between the movable plate (322) and the pressure plate (31), wherein a valve (53) is provided in the pressure-charging tube (52) for automatically opening the pressure-charging tube (52) to supply air to the pressure chamber after the rubber pressure sleeve (33) is pressurized.

4. The pressure resistance performance testing device for an anodic conversion film according to claim 1, characterized in that, The expansion assembly (34) includes a plurality of sliding brackets (342) evenly distributed along the circumferential direction of the pressure plate (31) and a linear actuator (343) for driving all the sliding brackets (342) to move outward synchronously. Each sliding bracket (342) can move radially on the pressure plate (31), and each sliding bracket (342) is also fixedly connected to the rubber pressure sleeve (33).

5. The anodic conversion film withstand voltage performance testing device according to claim 4, characterized in that, At the position corresponding to each sliding bracket (342) inside the rubber pressure sleeve (33), a first arc-shaped block (3411) fixedly connected thereto is provided. A second arc-shaped block (3412) is slidably clamped between every two adjacent first arc-shaped blocks (3411). The first arc-shaped block (3411) has a chute for sliding cooperation with the second arc-shaped block (3412). The first arc-shaped block (3411) and the second arc-shaped block (3412) are coaxial with the pressure plate (31). Each first arc-shaped block (3411) is located above the rubber ring sleeve (341) and has a shape matching that of the rubber ring sleeve (341). Each second arc-shaped block (3412) abuts against the inner side of the rubber ring sleeve (341). The first arc-shaped block (3411) and the second arc-shaped block (3412) surround the rubber ring sleeve (341) from above and inside, capable of preventing the rubber ring sleeve (341) from tilting upward while pushing the rubber ring sleeve (341), thereby realizing uniform and stable expansion of the rubber ring sleeve (341). When the first arc-shaped block (3411) moves outward following the sliding bracket (342), the second arc-shaped block (3412) is in a synchronous outward movement state, causing the rubber ring sleeve (341) to drive the rubber pressure sleeve (33) to be in an overall expanded state.

6. The pressure resistance performance testing device for an anodic conversion film according to claim 4, wherein The linear actuator (343) has a sliding sleeve (3431) slidably sleeved on the pressure pipe (52) and a connecting rod (3432) hinged between each sliding bracket (342) and the sliding sleeve (3431). A ball (311) in rolling contact with each sliding bracket (342) is rotatably provided on the pressure plate (31). When the sliding sleeve (3431) moves downward relative to the pressure plate (31), the connecting rod (3432) is in a state of pushing the sliding bracket (342) outward.

7. The pressure resistance performance testing device for anodic conversion film according to claim 6, wherein, A first return spring (3433) is fixedly connected between the sliding sleeve (3431) and the pressure plate (31). When the sliding sleeve (3431) is not activated, the first return spring (3433) is in an uncompressed state.

8. An anodic conversion film withstand voltage performance testing device according to claim 3, characterized in that, The valve (53) has a valve stem (531) inserted in the pressure charging pipe (52) and a valve sleeve (532) sleeved on the valve stem (531) and fixed to the pressure charging pipe (52). The inner diameter of the valve sleeve (532) gradually decreases from top to bottom, being an inverted cone. The lower end of the valve stem (531) has a lower end head (5311) fixedly connected to the inner bottom of the pressurized chamber body (51). The upper end of the valve stem (531) has an upper end head (5312) that fits with the valve sleeve (532), and the part where the upper end head (5312) fits with the valve sleeve (532) is a conical structure. When the rubber pressing sleeve (33) presses the sample (2), the upper end head (5312) of the valve stem (531) gradually moves away from the valve sleeve (532), so that a gap for the gas supply source to enter the pressure charging chamber is formed between the valve stem (531) and the valve sleeve (532). A second return spring (5313) is fixedly connected between the lower end head (5311) and the bottom surface of the pressure charging pipe (52). When the upper end head (5312) contacts the valve sleeve (532), the second return spring (5313) is in an uncompressed state.

9. A method for testing the voltage withstand performance of an anodic conversion film, which is applied to the device for testing the voltage withstand performance of an anodic conversion film according to any one of claims 1-8, and is characterized in that, It includes the following steps: S1. Place the sample (2) on the pressure measuring platform (4) in the temperature control box (1) and set the temperature. S2. Start the expansion component to drive the rubber pressing sleeve (33) to expand uniformly in multiple directions until the rubber pressing sleeve (33) fits the sample (2). S3. Start the pressure driving component (32) to drive the pressure plate (31) to move downward, so as to urge the rubber pressing sleeve (33) to press the sample (2). S4. After the pressure measuring platform (4) senses that the pressure on the sample (2) reaches the specified degree, the pressure driving component (32) stops moving and maintains the pressing state on the sample (2). S5. The operator observes and records the changes on the surface of the anodic conversion film of the sample (2) after being pressed through a microscope.

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