Device and method for testing pressure resistance of anode conversion film

Abstract

The invention relates to the field of anode conversion film voltage withstanding performance testing, in particular to an anode conversion film voltage withstanding performance testing device and method. Comprising a temperature control box, a pressurizing mechanism and an optical microscope, a pressure measuring platform is further arranged in the temperature control box, the pressurizing mechanism comprises a pressing disc and a pressurizing driving assembly, and the pressurizing mechanism further comprises a rubber pressing sleeve fixedly arranged on the pressing disc in a sleeving mode and an expanding assembly capable of expanding the rubber pressing sleeve. And a pressure maintaining structure for avoiding insufficient contact between the rubber pressing sleeve and the sample is arranged in the rubber pressing sleeve. The rubber pressing sleeve is driven by the expansion assembly to deform, so that the rubber pressing sleeve is synchronously expanded in multiple directions to ensure that the whole sample is uniformly pressed, and meanwhile, the pressure maintaining structure is started, so that the condition that the rubber pressing sleeve and the sample are insufficiently contacted is avoided, and the pressure uniformity is further improved.

Description

Technical Field

[0001] The invention relates to the field of anodic conversion film pressure resistance performance testing, and in particular to an anodic conversion film pressure resistance performance testing device and method. Background Art

[0002] Anodic oxidation technology is a material protection technology that forms an oxide film on the surface of metal materials in an electrolyte solution by applying an anodic current. It is also called surface anodic oxidation. After the metal material or product is anodized, a layer of film will appear on the surface, which is called an anodic conversion film. In order to understand the strength or heat resistance of the material after electrophoretic coating, it needs to be tested.

[0003] The existing testing device is prone to produce local stress concentration in certain parts of the sample during the withstand voltage test, which leads to distortion of the test results and cannot accurately reflect the overall performance of the anodic conversion film.

[0004] The currently disclosed Chinese patent authorization publication number CN217901410U is a device for testing the performance of an anodic conversion film in an electrophoretic coating process, comprising a pressure measuring unit: installed at the internal front end of a temperature control box; the pressure measuring unit comprises an L-shaped guide bar, a pusher frame, a vertical sliding angle plate and a pressure sensor, two L-shaped guide bars are installed at the internal front end of the temperature control box, the front and rear ends of the pusher 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 pusher frame, and the pressure sensor is installed at the front left side of the press table. By moving the pusher frame left and right, the parts after electrophoresis on the vertical sliding angle plate can be moved, which is convenient for temperature resistance test and pressure resistance test. During the pressure resistance test, the vertical sliding angle plate can move up and down to better fit the upper end of the pressure sensor; the pressure measuring unit also comprises a fixed rod seat and a hydraulic rod, a fixed rod seat is installed on the upper side of the right end of the temperature control box, a hydraulic rod is installed at the lower end of the fixed rod seat, and a pressure plate is connected to the telescopic end of the hydraulic rod. By utilizing the operation of the hydraulic rod, the pressure plate can press the anodic conversion film of the parts after electrophoretic coating, making it convenient to test the compressive strength.

[0005] According to the above patent, the parts after electrophoresis on the vertical sliding angle plate can be moved by moving the push frame left and right, which is convenient for temperature resistance test and pressure resistance test. During the pressure resistance test, the vertical sliding angle plate can move up and down to better adhere to the upper end of the pressure sensor. However, the clamping method in the comparative document 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 surface of the sample is uneven, it will cause the local pressure to be too large or too small, affecting the accuracy of the test results. Therefore, there is a need for a pressure resistance performance testing device for the anodic conversion film that can adjust the size of the pressure plate to meet the needs of samples of different sizes. 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, a first arc block fixedly connected to the rubber pressure sleeve is provided at a position corresponding to each sliding frame inside the rubber pressure sleeve, and a second arc block is slidably engaged between every two adjacent first arc blocks, the first arc block has a sliding groove that slidably cooperates with the second arc block, the first arc block and the second arc block are both coaxial with the pressure plate, each first arc block is located above the rubber ring sleeve and has a shape matching the rubber ring sleeve, and each second arc block contacts the inner side of the rubber ring sleeve, the first arc block and the second arc block surround the rubber ring sleeve from above and inside, and can prevent the rubber ring sleeve from warping upward while pushing the rubber ring sleeve, thereby realizing uniform and stable expansion of the rubber sleeve, and when the first arc block moves outward with the sliding frame, the second arc block is synchronously in a state of moving outward, so that the rubber ring sleeve drives the rubber pressure sleeve to be in a state of overall expansion.

[0013] Preferably, the linear drive has a sliding sleeve slidably mounted on the charging tube and a connecting rod hingedly arranged between each sliding frame and the sliding sleeve. A ball is rotatably provided on the pressure plate and is in rolling contact with each sliding frame. When the sliding sleeve moves downward relative to the pressure plate, the connecting rod is in a state of pushing the sliding frame outward.

[0014] Preferably, a first return spring is fixedly connected between the sliding sleeve and the pressure plate, and when the sliding sleeve is not started, the first return spring is in an uncompressed state.

[0015] Preferably, the valve comprises a valve stem inserted in the pressure charging tube and a valve sleeve mounted on the valve stem and fixed to the pressure charging tube. The inner diameter of the valve sleeve gradually decreases from top to bottom and is an inverted cone. The lower end of the valve stem has a lower end head fixedly connected to the bottom of the pressurized chamber body, and the upper end of the valve stem has an upper end head that fits with the valve sleeve. The part where the upper end head fits with the valve sleeve is a conical structure. When the rubber pressure sleeve squeezes the sample, the upper end head of the valve stem gradually moves away from the valve sleeve, so that a gap is formed between the valve stem and the valve sleeve for the air supply source to enter the pressure charging chamber. A second return spring is fixedly connected between the lower end head and the bottom surface of the pressure charging tube. 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, comprising the following steps:

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

[0018] S2, starting the expansion component to drive the rubber compression sleeve to expand evenly in multiple directions until the rubber compression sleeve fits the sample;

[0019] S3, starting the pressurizing drive assembly to drive the pressure plate to move downward, causing the rubber pressure sleeve to apply pressure to the sample;

[0020] S4. After the pressure measuring platform senses that the pressure of the sample reaches a specified level, the pressure driving component stops moving and keeps applying pressure to the sample;

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

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention drives the rubber sleeve to deform through the expansion component, so that it expands evenly in multiple directions, ensuring that the sample is evenly compressed as a whole. As the pressure plate applies vertical pressure to the upper surface of the sample, the rubber sleeve gradually applies pressure to the sample during the descending process of the pressure plate. At the same time, the pressure-maintaining structure inside the rubber sleeve is activated to avoid insufficient contact between the rubber sleeve and the sample.

[0024] Each time the pressure plate presses the sample at a 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. After all the predetermined pressure value tests are completed, the pressure resistance performance of the anodic conversion film at different pressures is known.

[0025] 2. In the present invention, when the rubber compression sleeve contacts the sample and starts to apply pressure, the valve automatically opens the inflation path of the pressure-charging tube, and the gas pressure in the pressure-charging chamber gradually increases, so that the pressurized chamber body applies pressure to the rubber compression sleeve.

[0026] The uniformity and stability of the contact between the rubber sleeve and the sample surface are maintained, which effectively prevents the inaccuracy of the pressure resistance test of the anodic conversion film caused by local uneven pressure and improves the accuracy and reliability of the test.

[0027] 3. The present invention drives the rubber ring to expand as a whole through the expansion component, so that the rubber pressure sleeve enters the expansion state synchronously, ensuring uniform expansion in multiple directions. Therefore, the rubber pressure sleeve can apply pressure evenly when it contacts the sample surface, ensuring that the rubber pressure sleeve applies pressure to the sample as a whole.

[0028] The uniformity and consistency of force applied to the sample during the test is ensured, and the reliability and accuracy of the test results are improved. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

[0032] Figure 4 The invention discloses a three-dimensional structural cross-sectional view of an anodic conversion film pressure resistance performance testing device excluding a temperature control box.

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

[0034] Figure 6 The present invention is a partial three-dimensional structural cross-sectional view of a pressurizing mechanism of an anodic conversion film pressure resistance performance testing device.

[0035] Figure 7 yes Figure 4 An enlarged schematic diagram of point A.

[0036] Figure 8 The present invention is a schematic diagram of the three-dimensional structure of a rubber compression sleeve and an expansion component of a device for testing the pressure resistance of an anodic conversion film.

[0037] Fig. 9 The three-dimensional structure diagram of the expansion assembly of the anodic conversion film pressure resistance performance testing device of the present invention is shown in FIG. Figure 1 .

[0038] Fig.10 The three-dimensional structure diagram of the expansion assembly of the anodic conversion film pressure resistance performance testing device of the present invention is shown in FIG. Figure 2 .

[0039] The numbers 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, fixed plate; 3211, pneumatic rod; 322, movable plate; 33, rubber pressure sleeve; 34, expansion assembly; 341, rubber ring sleeve; 3411, first arc block; 3412, second arc block; 342, sliding frame; 343, linear drive; 3431, sliding sleeve; 3432, connecting rod; 3433, first return spring; 4, pressure measuring platform; 5, pressure maintaining structure; 51, pressurizing chamber; 52, charging pipe; 53, valve; 531, valve stem; 5311, lower end; 5312, upper end; 5313, second return spring; 532, valve sleeve; 6, pressure buffer structure. DETAILED DESCRIPTION

[0040] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0041] See also Figure 1-Figure 6As shown, a device for testing the pressure resistance of an anodic conversion film comprises a temperature control box 1 and a pressure 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 control box 1 and below the pressure mechanism 3. A frame 11 for installing the pressure mechanism 3 is provided in the temperature control box 1. The pressure mechanism 3 comprises a pressure plate 31 and a pressure driving component 32 arranged on the frame 11 for driving the pressure plate 31. When the pressure driving component 32 drives the pressure plate 31, the pressure plate 31 The upper surface of the sample 2 is in a state of vertical pressure. The pressure mechanism 3 also includes a rubber pressure sleeve 33 fixedly mounted on the pressure plate 31 and an expansion component 34 capable of expanding the rubber pressure sleeve 33. When the expansion component 34 drives the rubber pressure sleeve 33, the rubber pressure sleeve 33 is in a deformed state, so that the sample 2 is evenly pressurized as a whole. The rubber pressure sleeve 33 is provided with a pressure-maintaining structure 5 for avoiding insufficient contact between the rubber pressure sleeve 33 and the sample 2. When the rubber pressure sleeve 33 applies pressure to the sample 2, the pressure-maintaining structure 5 is started synchronously, so that the rubber pressure sleeve 33 further applies pressure on the sample 2.

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

[0043] When the anodic conversion film pressure resistance test begins, the sample 2 is first placed on the pressure measuring 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 a predetermined temperature, the operator starts the pressurizing mechanism 3. The pressurizing drive assembly 32 applies vertical pressure to the upper surface of the sample 2.

[0045] Before the rubber sleeve 33 contacts the sample 2, the expansion assembly 34 is activated to drive the rubber sleeve 33 to deform. This allows the rubber sleeve 33 to expand evenly in multiple directions, ensuring that the sample 2 is evenly compressed as a whole. The rubber sleeve 33 first contacts the surface of the sample 2, which serves as a preliminary pressure test. As the pressure plate 31 continues to descend, the rubber sleeve 33 is further compressed. This process can not only prevent the sample 2 from being damaged due to 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 pressing sleeve 33 is activated to avoid the situation where the rubber pressing sleeve 33 and the sample 2 are not in sufficient contact.

[0047] When the pressure plate 31 reaches the predetermined lowest position, that is, when the pressure measuring platform 4 senses that the pressure of the sample 2 has reached a specified level, the pressure driving assembly 32 stops moving and keeps for a period of time to ensure that the sample 2 is fully pressurized. After completing the test of a pressure value, the pressure driving assembly 32 moves in the opposite direction, causing the pressure plate 31 to rise slowly, and the rubber pressure sleeve 33 gradually returns to its original state.

[0048] The operator then 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, deformation of the film layer, etc. In order to ensure the comprehensiveness and accuracy of the test, the pressure value is usually increased step by step, one small step at a time, and the state of sample 2 at each pressure value is recorded. The above process is repeated until all the predetermined pressure value tests are completed. The pressure resistance performance of the anodic conversion film under different pressures is understood in detail. By analyzing 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 also Figure 1-Figure 6 As shown, the pressurizing drive assembly 32 includes a fixed plate 321 fixedly arranged on the frame 11, a movable plate 322 slidably arranged on the frame 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, and a pressure buffer structure 6 is provided between the pneumatic rod 3211 and the movable plate 322 for maintaining stable pressure during the process of applying pressure to the pressure plate 31.

[0050] When the gas pressure 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 the sample 2 remains stable throughout the entire pressurization process. This not only helps to improve the accuracy and reliability of the test, but also reduces the damage to the sample 2 that may be caused by sudden pressure changes, and prolongs the service life of the 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 of the sample 2 has reached a specified level, the pressure driving assembly 32 stops moving and keeps for a period of time to ensure that the sample 2 is fully pressurized. After completing the test of a pressure value, the gas pressure rod 3211 moves in the opposite direction, so that the movable plate 322 drives the pressure plate 31 to rise slowly, and the rubber pressure sleeve 33 gradually returns to its original state.

[0052] See also Figure 1-Figure 6 As shown, the pressure maintaining structure 5 has a pressurizing chamber body 51, and the pressurizing chamber body 51 is a flexible structure. A pressure chamber is formed between the pressurizing chamber body 51 and the pressure plate 31. A pressure charging tube 52 connected to the pressure charging chamber is fixedly connected between the movable plate 322 and the pressure plate 31. The pressure charging tube 52 is provided with a valve 53 for automatically opening the pressure charging tube 52 to supply air to the pressure charging chamber after the rubber pressure sleeve 33 is pressurized.

[0053] When the rubber pressing sleeve 33 contacts the sample 2 and starts to apply pressure, the pressurizing chamber 51 , as a flexible structure, will deform accordingly with the deformation of the rubber pressing 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 Figure 4-Figure 6 and Figure 8-Figure 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 Figure 4-Figure 6 and Figure 8-Figure 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 also Figure 4-Figure 6 and Figure 8-Figure 10 As shown, a first arc block 3411 fixedly connected to the rubber pressure sleeve 33 is provided at a position corresponding to each sliding frame 342, and a second arc block 3412 is slidably engaged between every two adjacent first arc blocks 3411, the first arc block 3411 has a sliding groove slidably matched with the second arc block 3412, the first arc block 3411 and the second arc block 3412 are both coaxial with the pressure plate 31, each first arc block 3411 is located above the rubber ring sleeve 341 and has a shape matching the rubber ring sleeve 341, each second arc block 3412 is in contact with the inner side of the rubber ring sleeve 341, the first arc block 3411 and the second arc block 3412 surround the rubber ring sleeve 341 from the top and the inside, and can prevent the rubber ring sleeve 341 from warping upward while pushing the rubber ring sleeve 341, thereby achieving uniform and stable expansion of the rubber ring sleeve 341. When the first arc block 3411 moves outward following the sliding frame 342 , the second arc block 3412 is simultaneously in a state of moving outward, so that the rubber ring 341 drives the rubber pressing sleeve 33 to be in an overall expanded state.

[0062] When the linear drive 343 is started, all the sliding frames 342 are driven to move outward synchronously. Since each sliding frame 342 is fixedly connected to a first arc block 3411, when the sliding frame 342 moves outward, the first arc block 3411 also moves outward. The outward movement of the first arc block 3411 will push the second arc block 3412 to move outward synchronously through the slide groove. It is ensured that the second arc block 3412 can closely follow the movement of the first arc block 3411 to maintain the consistency of the entire movement.

[0063] As the first arc block 3411 and the second arc block 3412 move outward, the edges of the first arc block 3411 and the second arc block 3412 will exert outward pressure on the rubber ring 341. After receiving such pressure, the rubber ring 341 will gradually expand, thereby driving the rubber pressure sleeve 33 to expand outward as a whole. This allows the rubber pressure sleeve 33 to expand evenly in multiple directions, ensuring that when it contacts the surface of the sample 2, it can fully exert pressure, thereby improving the uniformity and stability of the pressure exerted on the sample 2.

[0064] See also Figure 4-Figure 6 and Figure 8-Figure 10 As shown, the linear drive 343 has a sliding sleeve 3431 slidably mounted on the charging tube 52 and a connecting rod 3432 hingedly arranged between each sliding frame 342 and the sliding sleeve 3431. A ball 311 is rotatably provided on the pressure plate 31 and is in rolling contact with 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 drive 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 frame 342 through the hinged connecting rod 3432. Since one end of the connecting rod 3432 is hinged to the sliding sleeve 3431 and the other end is hinged to the sliding frame 342, when the sliding sleeve 3431 moves downward, the connecting rod 3432 forms a lever effect to push the sliding frame 342 outward. It ensures that the movement of all sliding frames 342 is synchronized, avoiding deflection or jamming caused by inconsistent movement of a single sliding frame 342.

[0066] When the sliding frame 342 moves outward, it will slide outward from the center of the circle along the radial direction of the pressure plate 31. In order to ensure the smooth movement of the sliding frame 342, a plurality of balls 311 are provided on the pressure plate 31, which greatly reduces the friction between the sliding frame 342 and the pressure plate 31, so that the sliding frame 342 can move outward more smoothly. As the sliding frame 342 moves outward, the first arc block 3411 fixed thereon will also move outward accordingly.

[0067] See also Figure 4-Figure 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 drive 343 stops running, the first return spring 3433 pushes the sleeve 3431 to return upward. The upward movement of the sleeve 3431 pulls the sliding frame 342 back to the retracted state through the connecting rod 3432, so that the first arc block 3411 and the second arc block 3412 return to the initial position, and the rubber ring 341 and the rubber pressing sleeve 33 also shrink accordingly.

[0069] As the rubber ring 341 and the rubber pressing sleeve 33 shrink, it is ensured that the rubber ring 341 and the rubber pressing sleeve 33 can be restored to the initial state after each operation, so as to be ready for the next operation, which is conducive to making changes according to samples 2 of different sizes.

[0070] See also Figure 4-Figure 10As shown, the valve 53 comprises a valve stem 531 inserted in the pressure charging tube 52 and a valve sleeve 532 sleeved on the valve stem 531 and fixed to the pressure charging tube 52. The inner diameter of the valve sleeve 532 gradually decreases from top to bottom and is in an inverted cone shape. The lower end of the valve stem 531 comprises a lower end head 5311 fixedly connected to the bottom of the pressurized chamber 51, and the upper end of the valve stem 531 comprises an upper end head 5312 matched with the valve sleeve 532. The upper end head 5312 and the valve sleeve 532 are connected to each other. The mating part is a conical structure. When the rubber sleeve 33 squeezes the sample 2, the upper end 5312 of the valve stem 531 gradually moves away from the valve sleeve 532, so that a gap is formed between the valve stem 531 and the valve sleeve 532 for the air supply source to enter the charging chamber. A second return spring 5313 is fixedly connected between the lower end 5311 and the bottom surface of the charging tube 52. When the upper end 5312 contacts the valve sleeve 532, the second return spring 5313 is in an uncompressed state.

[0071] When the rubber sleeve 33 squeezes the sample 2, as the pressure plate 31 continues to press down, the rubber sleeve 33 is deformed, the valve stem 531 is in a stationary state relative to the sample 2, and the pressure plate 31 is in an active state relative to the valve stem 531. Since the pressure tube 52 is fixedly arranged on the pressure plate 31 and the valve sleeve 532 is fixedly arranged in the pressure tube 52, the valve sleeve 532 moves downward relative to the valve stem 531. At this time, the upper end 5312 of the valve stem 531 is gradually separated from the valve sleeve 532, thereby gradually opening the gap for the gas source to enter the pressure chamber. At this time, the second reset spring 5313 begins to be compressed. After the rubber sleeve 33 stops squeezing the sample 2, the second reset spring 5313 will help the valve stem 531 to reset quickly. When the second reset spring 5313 reaches the maximum compression state, the maximum gap is formed between the upper end 5312 of the valve stem 531 and the valve sleeve 532, and the channel between the gas source and the pressure chamber is completely opened, and the gas can flow freely.

[0072] When the second return spring 5313 pushes the valve stem 531 to return downward, the upper end 5312 of the valve stem 531 is in close contact with the valve sleeve 532 again, closing the passage between the gas source and the pressure chamber. The second return spring 5313 returns to an uncompressed state, ensuring that the valve 53 returns to its initial closed state.

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

[0074] S1, placing the sample 2 on the pressure measuring platform 4 in the temperature control box 1 and setting the temperature;

[0075] S2, start the expansion component to drive the rubber pressing sleeve 33 to expand evenly in multiple directions until the rubber pressing sleeve 33 is adapted to the sample 2;

[0076] S3, start the pressure driving assembly 32 to drive the pressure plate 31 to move downward, so that the rubber pressure sleeve 33 applies pressure to the sample 2;

[0077] S4, after the pressure measuring platform 4 senses that the pressure of the sample 2 reaches a specified level, the pressure driving component 32 stops moving and keeps applying pressure to the sample 2;

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

[0079] The present invention drives the rubber pressure sleeve 33 to deform through the expansion component 34, so that it expands synchronously in multiple directions, ensuring that the sample 2 is uniformly compressed as a whole. When the pressure plate 31 applies 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 where the rubber pressure sleeve 33 is not in sufficient contact with the sample 2, and further improving the uniformity of the pressure.

[0080] 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, the pressure resistance performance of the anodic conversion film under different pressures is fully understood to ensure the comprehensiveness and accuracy of the test.

[0081] The above embodiments only express one or several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the protection scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A device for testing the pressure resistance of an anodic conversion film, comprising a temperature control box (1) and a pressure 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 control box (1) and below the pressure 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 driving 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 vertically applying 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 compression sleeve (33), the rubber compression sleeve (33) is in a deformed state, so that the sample (2) is uniformly 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).

2. The device for testing the withstand voltage performance of an anodic conversion film according to claim 1, characterized in that: The pressurizing drive assembly (32) comprises a fixed plate (321) fixedly mounted on a 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 device for testing the withstand voltage performance of an anodic conversion film according to claim 2, characterized in that: The pressure-maintaining structure (5) comprises a pressurizing chamber body (51), wherein the pressurizing chamber body (51) is a flexible structure, a pressure chamber is formed between the pressurizing chamber body (51) and the pressure plate (31), a pressure charging tube (52) connected to the pressure charging chamber is fixedly connected between the movable plate (322) and the pressure plate (31), and 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 charging chamber after the rubber pressure sleeve (33) is pressurized.

4. The device for testing the withstand voltage performance of an anodic conversion film according to claim 3, characterized in that: A rubber ring (341) is provided in the rubber compression 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 compression sleeve (33) is in a synchronously expanded state under the push of the rubber ring (341).

5. The device for testing the withstand voltage performance of anodizing film according to claim 4, characterized in that: 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 the radial direction of the pressure plate (31), and each sliding frame (342) is also fixedly connected to the rubber pressure sleeve (33).

6. The device for testing the withstand voltage performance of anodizing film according to claim 5, characterized in that: A first arc block (3411) fixedly connected to the rubber pressure sleeve (33) is provided at a position corresponding to each sliding frame (342), a second arc block (3412) is slidably connected between each two adjacent first arc blocks (3411), the first arc block (3411) has a slide groove slidably matched with the second arc block (3412), the first arc block (3411) and the second arc block (3412) are coaxial with the pressure plate (31), each first arc block (3411) is located above the rubber ring sleeve (341) and has a shape matching the rubber ring sleeve (341). Each second arc block (3412) contacts the inner side of the rubber ring sleeve (341), and the first arc block (3411) and the second arc block (3412) surround the rubber ring sleeve (341) from the top and the inside, so as to prevent the rubber ring sleeve (341) from tilting upward while pushing the rubber ring sleeve (341), thereby achieving uniform and stable expansion of the rubber ring sleeve (341). When the first arc block (3411) moves outward following the sliding frame (342), the second arc block (3412) is synchronously in a state of moving outward, so that the rubber ring sleeve (341) drives the rubber pressure sleeve (33) to be in an overall expanded state.

7. The device for testing the withstand voltage performance of anodizing film according to claim 5, characterized in that: The linear drive (343) comprises a sliding sleeve (3431) slidably mounted on the pressure tube (52) and a connecting rod (3432) hingedly mounted between each sliding frame (342) and the sliding sleeve (3431). A ball (311) rotatably mounted on the pressure plate (31) and in rolling contact with each sliding frame (342) is provided. 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.

8. The device for testing the withstand voltage performance of anodizing film according to claim 7, characterized in that: 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.

9. The device for testing the withstand voltage performance of an anodic conversion film according to claim 3, characterized in that: The valve (53) comprises a valve stem (531) inserted into the pressure charging tube (52) and a valve sleeve (532) sleeved on the valve stem (531) and fixed to the pressure charging tube (52). The inner diameter of the valve sleeve (532) gradually decreases from top to bottom and is in an inverted cone shape. The lower end of the valve stem (531) comprises a lower end head (5311) fixedly connected to the bottom of the pressurized chamber (51). The upper end of the valve stem (531) comprises an upper end head (5312) matched with the valve sleeve (532). The upper end head (5312) and the valve sleeve (532) are connected to each other. ) has a conical structure in the mating part; when the rubber compression sleeve (33) squeezes the sample (2), the upper end (5312) of the valve stem (531) gradually moves away from the valve sleeve (532), so that a gap is formed between the valve stem (531) and the valve sleeve (532) for the air supply source to enter the charging chamber, and a second return spring (5313) is fixedly connected between the lower end (5311) and the bottom surface of the charging tube (52), and when the upper end (5312) contacts the valve sleeve (532), the second return spring (5313) is in an uncompressed state.

10. A method for testing the withstand voltage performance of an anodic conversion film, applied to a device for testing the withstand voltage performance of an anodic conversion film as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: S1, placing the sample (2) on a pressure measuring platform (4) in a temperature-controlled box (1) and setting the temperature; S2, starting the expansion component to drive the rubber pressing sleeve (33) to expand evenly in multiple directions until the rubber pressing sleeve (33) is matched with the sample (2); S3, starting the pressure driving assembly (32) to drive the pressure plate (31) to move downward, causing the rubber pressure sleeve (33) to apply pressure to the sample (2); S4, after the pressure measuring platform (4) senses that the pressure of the sample (2) reaches a specified level, the pressure driving component (32) stops moving and maintains the pressure state on the sample (2); S5. The operator observes and records the changes of the anodic conversion film on the surface of sample (2) after being subjected to pressure through a microscope.

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