Transparent protective device

Abstract

The utility model discloses a material forming test equipment technical field's a kind of transparent protective device, including base frame and transparent baffle, transparent baffle is fixedly installed on base frame, transparent baffle includes first transparent layer and second transparent layer, along the direction of base frame inside direction base frame outside, first transparent layer and second transparent layer are sequentially arranged, and anti-reflection layer is filled with between first transparent layer and second transparent layer, and anti-reflection layer is PET base nano coating anti-reflection optical film.The utility model solves the technical problem that the mirror surface reflection interference is serious, and imaging quality is unstable in the prior art using double-layer hollow organic glass for protection.

Description

Technical Field

[0001] This utility model relates to the field of material forming test equipment technology, and in particular to a transparent protective device. Background Technology

[0002] In material processing or testing, protective doors and transparent viewing windows are typically installed to prevent injury from splashing high-pressure liquids or sample fragments. However, in order to achieve visual observation of the sample deformation process, material forming tests usually introduce digital image capture (DIC) technology, which uses high-resolution, high-speed cameras to track and observe the state, deformation, crack propagation, etc. of the specimen during the material test.

[0003] Chinese utility model patent with publication number CN204758461U discloses a visual material testing environment temperature chamber, including a test chamber and an equipment box. The test chamber is sealed and enclosed by a top plate, a front side plate, a rear side plate, a left side plate, a right side plate, and a bottom plate. The equipment box is equipped with a temperature control device that can control the temperature inside the test chamber. The frame parts of the front side plate, rear side plate, left side plate, and right side plate are made of metal sandwich insulation board, and the rest are made of transparent insulation material, which is double-layer hollow organic glass.

[0004] Since high-resolution, high-speed cameras observe samples outside the test chamber, and digital image acquisition technology has high requirements for optical imaging quality, it is particularly dependent on clear images with uniform illumination and no reflective interference. Double-layer hollow plexiglass is prone to specular reflection, light spot interference, or image distortion under high-intensity lighting or complex lighting environments, which seriously affects the image quality and may even lead to measurement failure. Utility Model Content

[0005] To address the technical problems of severe specular reflection interference and unstable imaging quality in existing technologies that use double-layer hollow organic glass for protection, this utility model provides a transparent protective device.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] A transparent protective device includes a base frame and a transparent partition. The transparent partition is fixedly installed on the base frame. The transparent partition includes a first transparent layer and a second transparent layer, which are arranged in a direction from the inside of the base frame to the outside of the base frame. The first transparent layer and the second transparent layer are arranged in sequence. An anti-reflective layer is filled between the first transparent layer and the second transparent layer. The anti-reflective layer is a PET-based nano-coated anti-reflective optical film.

[0008] Furthermore, the first transparent layer is an optical-grade modified acrylic sheet or a polycarbonate sheet.

[0009] Furthermore, the second transparent layer has the same material and thickness as the first transparent layer, and the first and second transparent layers are arranged symmetrically with respect to the anti-reflective layer.

[0010] Furthermore, the first transparent layer, the anti-reflective layer, and the second transparent layer are bonded together with a light-transmitting optical adhesive.

[0011] Furthermore, a groove is provided on the outer side of the base frame, and the first transparent layer, the anti-reflective layer, and the second transparent layer are all embedded in the groove.

[0012] Furthermore, it also includes a buffer sealing ring, which is disposed between the bottom of the groove and the first transparent layer, and the buffer sealing ring is in compression contact with the bottom of the groove and the first transparent layer respectively.

[0013] Furthermore, the buffer seal is made of silicone material.

[0014] Furthermore, it also includes fixing bolts and two pressure plates, which are respectively set on opposite sides of the second transparent layer. The pressure plates have a first through hole, and the base frame has a corresponding second through hole. The fixing bolts pass through the first and second through holes. After tightening the fixing bolts, the pressure plates are pressed into contact with the outer surface of the second transparent layer.

[0015] Furthermore, the pressure plate is made of alloy.

[0016] The beneficial effects of this utility model are:

[0017] This invention solves the problem that traditional double-layer hollow acrylic glass is prone to specular reflection, light spot interference, or image distortion under high-intensity lighting or complex lighting environments, which seriously affects image quality and may even lead to measurement failure. By setting an anti-reflective layer between the first and second transparent layers, the anti-reflective layer is a PET-based nano-coated anti-reflective optical film, achieving a light transmittance of no less than 95% and a reflectivity of less than 0.5%. This effectively reduces specular reflection and light spot interference, allowing the DIC camera to stably and clearly acquire images of the sample surface throughout the entire material forming process, thereby achieving high-precision measurement of the material deformation process. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the exploded structure of the transparent protective device of this utility model;

[0019] Figure 2 This is a schematic diagram of the transparent protective device structure of this utility model;

[0020] Figure 3 This is a schematic diagram showing the positional relationship between the DIC camera, the transparent partition, and the sample to be observed.

[0021] The figures are labeled as follows: 1-base frame, 2-first transparent layer, 3-second transparent layer, 4-anti-reflective layer, 5-groove, 6-buffer sealing ring, 7-fixing bolt, 8-pressure plate, 9-first through hole, 10-second through hole, 11-DIC camera, 12-sample to be observed. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the present invention will be further described below with reference to the accompanying drawings.

[0023] First, it should be stated that the technical solutions of the embodiments of this application are clearly and completely described. The described embodiments are only some of the embodiments of this application, and not a limitation of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0024] In the description of this utility model, it should be understood that the terms "first", "second", "upper", "lower", "left", "right", "inner", "outer", "axial" or "radial" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and are not intended to indicate or imply that the device or element referred to must have a specific orientation structure and operation. Therefore, they should not be construed as limitations on this utility model.

[0025] like Figures 1 to 3 As shown, this utility model provides a transparent protective device.

[0026] like Figures 1 to 3 As shown, in some embodiments, a transparent protective device is provided, including a base frame 1 and a transparent partition. The transparent partition is fixedly installed on the base frame 1. The transparent partition includes a first transparent layer 2 and a second transparent layer 3, arranged sequentially along the inner side of the base frame 1 towards the outer side. An anti-reflective layer 4 is filled between the first transparent layer 2 and the second transparent layer 3. The anti-reflective layer 4 is a PET-based nano-coated anti-reflective optical film. In this embodiment, the three-layer transparent partition has a light transmittance of not less than 95% and a reflectance of less than 0.5%, which can significantly reduce optical interference and improve the clarity of DIC image imaging. For the first transparent layer 2 and the second transparent layer 3, plexiglass, optical-grade modified acrylic sheets, polycarbonate sheets, or transparent components used in digital image acquisition environments on the market can be used.

[0027] The outer side of the base frame 1 refers to the side of the base frame 1 facing the external environment, while the inner side of the base frame 1 refers to the side of the base frame 1 facing the specimen 12 to be observed.

[0028] like Figures 1 to 3As shown, in some embodiments, the first transparent layer 2 is an optical-grade modified acrylic sheet or a polycarbonate sheet with a thickness of 3mm-5mm. The optical-grade modified acrylic sheet or polycarbonate sheet possesses excellent impact resistance and corrosion resistance, effectively resisting hydraulic oil splashes and sample breakage impacts (withstanding 30J of impact energy and resisting splashes from sample fragments). The second transparent layer 3 can be made of plexiglass, optical-grade modified acrylic sheet, polycarbonate sheet, or transparent components used in commercially available digital image acquisition environments. Preferably, the second transparent layer 3 has the same material and thickness as the first transparent layer 2, and the first transparent layer 2 and the second transparent layer 3 are symmetrically arranged relative to the anti-reflection layer 4 to enhance the optical uniformity of the overall structure and eliminate wavefront distortion in the optical path.

[0029] like Figures 1 to 3 As shown, in some embodiments, the first transparent layer 2, the anti-reflective layer 4, and the second transparent layer 3 are bonded and fixed together using a light-transmitting optical adhesive. Alternatively, a clamping assembly can be provided to clamp and fix the first transparent layer 2, the anti-reflective layer 4, and the second transparent layer 3. Light-transmitting optical adhesives include two main categories: natural resin optical adhesives and synthetic resin optical adhesives. Specifically, adhesives such as silicone, acrylic resins, unsaturated polyesters, polyurethanes, and epoxy resins can be used to bond optical components. During formulation, some processing agents are usually added to improve their optical properties or reduce curing shrinkage.

[0030] like Figures 1 to 3 As shown, a groove 5 is further provided on the outer side of the base frame 1, and the first transparent layer 2, the anti-reflective layer 4, and the second transparent layer 3 are all embedded in the groove 5. The groove 5 limits the periphery of the first transparent layer 2, the anti-reflective layer 4, and the second transparent layer 3, and the groove 5 realizes the pre-positioning of the three-layer transparent partition, thereby improving assembly efficiency.

[0031] like Figures 1 to 3 As shown, it further includes a buffer sealing ring 6, which is disposed between the bottom of the groove 5 and the first transparent layer 2. The buffer sealing ring 6 is in contact with both the bottom of the groove 5 and the first transparent layer 2 by compression. The buffer sealing ring 6 is preferably made of oil-resistant and heat-resistant silicone material. Alternatively, it can be made of rubber or other commonly used sealing rings with a certain degree of elasticity. The buffer sealing ring 6 has a dual function of buffering and sealing, used to absorb the vibration energy during hydraulic shock and prevent liquid leakage.

[0032] like Figures 1 to 3As shown, in some embodiments, the device further includes fixing bolts 7 and two pressure plates 8, which are respectively disposed on opposite sides of the second transparent layer 3. Each pressure plate 8 has a first through hole 9, and the base frame 1 has a corresponding second through hole 10. At least part of the pressure plate 8 is in contact with the second transparent layer 3. The fixing bolts 7 pass through the first through hole 9 and the second through hole 10. After tightening the fixing bolts 7, the pressure plate 8 is pressed against the outer surface of the second transparent layer 3. The fixing method of the combination of pressure plates 8 and fixing bolts 7 in this embodiment makes the device easy to replace, securely installed, and adaptable to various testing requirements.

[0033] Furthermore, the pressure plate 8 is made of an alloy, preferably a high-strength lightweight alloy, such as an aluminum alloy or a magnesium alloy.

[0034] The specific operating steps are as follows:

[0035] 1. Arrange the sample to be observed 12, the transparent partition, and the DIC camera 11 according to... Figure 3 The positions shown are mounted on the molding test machine. The specimen is placed inside the hydraulic bulging mold, and a transparent partition is installed directly above the specimen 12 to isolate the space between the area of ​​the specimen 12 and the DIC camera 11. The DIC camera 11 is fixed outside the observation window, facing the deformed area of ​​the specimen 12, and is used to capture images in real time.

[0036] 2. As the hydraulic bulging test proceeds, the specimen 12 under observation gradually bulges into a hemispherical structure under internal hydraulic pressure. Deformation accumulates continuously, and when the specimen 12 approaches its ultimate forming state, strain concentration occurs at its top or edge, eventually leading to material fracture and the formation of a crack. Hydraulic oil sprays upwards at high speed through the crack. At this point, the transparent partition positioned directly above the specimen 12 effectively blocks the high-pressure liquid from splashing outside the test area, ensuring the safety of the camera equipment and operators.

[0037] 3. The transparent partition adopts the low-reflectivity three-layer structure design of this utility model. The middle layer is an anti-reflection layer 4, which can effectively reduce specular reflection and light spot interference, so that the DIC camera 11 can stably and clearly acquire the surface image of the sample 12 to be observed throughout the entire bulging process, thereby realizing high-precision measurement and visual recording of the deformation process. This transparent protective device takes into account both safety protection and optical imaging performance, effectively improving the repeatability of the test and image quality.

[0038] (1) The transparent protective device of this utility model is used for hydraulic bulging test of TA1 pure titanium plate.

[0039] a. The material is TA1, the sheet is in the annealed state, the size is 0.5mm*200mm*200mm, the yield strength is 188Mpa, the tensile strength is 308Mpa, and the elongation is 63%.

[0040] b. Using a ZwickBUP100 hydraulic bulging tester, the specimen 12 to be observed is fixed in the bulging mold. The mold opening diameter is 100 mm. A transparent partition is installed above the mold and between it and the DIC camera 11 to form a sealed transparent window. The DIC system model is GOM ARAMIS 5M, the sampling frequency is 20Hz, and the light source adopts a diffuse reflection LED array to reduce direct reflection interference.

[0041] c. Bulging results: The pressurizing medium was hydraulic oil, the loading rate was 5 MPa / s, the maximum pressure was 38 MPa, the rupture pressure was 34.5 MPa, the bulging height was 35.3 mm, the rupture location was the center of the dome region of the specimen under observation, the image clarity was DIC image quality factor Q value > 0.85, there was no reflective glare in the entire image, the deformation tracking rate was 100%, and the data acquisition was complete.

[0042] (2) The transparent protective device of this utility model is used for hydraulic bulging test of 5052 aluminum alloy plate.

[0043] a. The material is 5052 aluminum alloy (H32 temper), with dimensions of 1mm*200mm*200mm, yield strength of 190MPa, tensile strength of 265MPa, and elongation of 18.5%.

[0044] b. Using a ZwickBUP100 hydraulic bulging tester, the specimen 12 to be observed is fixed in the bulging mold. The mold opening diameter is 100 mm. A transparent partition is installed above the mold and between it and the DIC camera 11 to form a sealed transparent window. The DIC system model is GOM ARAMIS 5M, the sampling frequency is 20Hz, and the light source adopts a diffuse reflection LED array to reduce direct reflection interference.

[0045] c. Bulging results: The rupture pressure was 26.5 MPa, the bulging height was 22.1 mm, the rupture location was the center of the dome area of ​​the sample to be observed, the image clarity was <1% of the DIC image reflection interference area, and there was no splashing or leakage throughout the process.

[0046] Verification through the above two embodiments shows that the transparent protective device provided by this utility model can not only adapt to a variety of materials and plate thicknesses, but also performs well in terms of safety protection, image acquisition quality and equipment compatibility, and has good engineering application and promotion value.

Claims

1. A transparent protective device, comprising a base frame (1) and a transparent partition, the transparent partition being fixedly installed on the base frame (1), the transparent partition comprising a first transparent layer (2) and a second transparent layer (3), characterized in that, Along the direction from the inside of the base frame (1) to the outside of the base frame (1), the first transparent layer (2) and the second transparent layer (3) are arranged in sequence, and an anti-reflection layer (4) is filled between the first transparent layer (2) and the second transparent layer (3). The anti-reflection layer (4) is a PET-based nano-coated anti-reflection optical film.

2. The transparent protective device as described in claim 1, characterized in that, The first transparent layer (2) is an optical grade modified acrylic sheet or a polycarbonate sheet.

3. The transparent protective device as described in claim 2, characterized in that, The second transparent layer (3) has the same material and thickness as the first transparent layer (2), and the first transparent layer (2) and the second transparent layer (3) are arranged symmetrically relative to the anti-reflective layer (4).

4. The transparent protective device as described in any one of claims 1 to 3, characterized in that, The first transparent layer (2), the anti-reflective layer (4), and the second transparent layer (3) are bonded together with a light-transmitting optical adhesive.

5. The transparent protective device as described in claim 1, characterized in that, A groove (5) is provided on the outer side of the base frame (1), and the first transparent layer (2), the anti-reflective layer (4) and the second transparent layer (3) are all embedded in the groove (5).

6. The transparent protective device as described in claim 5, characterized in that, It also includes a buffer sealing ring (6), which is disposed between the bottom of the groove (5) and the first transparent layer (2). The buffer sealing ring (6) is in contact with the bottom of the groove (5) and the first transparent layer (2) respectively.

7. The transparent protective device as described in claim 6, characterized in that, The buffer sealing ring (6) is made of silicone material.

8. The transparent protective device as described in claim 6, characterized in that, It also includes a fixing bolt (7) and two pressure plates (8). The two pressure plates (8) are respectively set on opposite sides of the second transparent layer (3). A first through hole (9) is opened on the pressure plate (8), and a second through hole (10) is correspondingly set on the base frame (1). The fixing bolt (7) passes through the first through hole (9) and the second through hole (10). After tightening the fixing bolt (7), the pressure plate (8) is pressed into contact with the outer surface of the second transparent layer (3).

9. The transparent protective device as described in claim 8, characterized in that, The pressure plate (8) is made of alloy.

Images