A diffusion plate internal stress detection device

Abstract

The utility model relates to the field of polymer materials and engineering technology discloses a diffusion plate internal stress detection device, including distribution control box, stainless steel water tank, heating rod, water pump motor, water circulation pipeline, temperature sensor, temperature control system and sample carrier, heating rod and temperature sensor all install in the stainless steel water tank inside, temperature control system respectively with temperature sensor, heating rod electricity is connected, and distribution control box respectively with heating rod, water pump motor, temperature control system electricity is connected, water pump motor links together with water circulation pipeline, and water circulation pipeline forms closed intercommunication structure with the stainless steel water tank, sample carrier sets up in the stainless steel water tank, is used for bearing the diffusion plate sample of detection. The device releases the release of internal stress of diffusion plate through simulating high temperature and high humidity environment acceleration, can complete the detection of warping tendency in short time to provide timely reliable data support for the process parameter optimization in production process.

Description

Technical Field

[0001] This utility model relates to the field of polymer materials and engineering technology, and in particular to a device for detecting internal stress in a diffusion plate. Background Technology

[0002] Diffuser plates, as light-diffusing materials, are widely used in the display and lighting industries. Their production process typically includes mixing and melting, extrusion molding, and cutting. During production, due to the inhomogeneity of the extrusion process and differences in cooling rates, varying degrees of internal stress often remain within the diffuser plate. Although the appearance flatness can be controlled through conventional warp testing before the product leaves the factory, these internal stresses may still be released during subsequent handling, storage, or in high-temperature and high-humidity environments at the customer's location, leading to warping and deformation of the plate and affecting the final performance of the product. Currently, the industry often uses long-term experiments simulating high-temperature and high-humidity environments to evaluate the stability of diffuser plates. However, this method has a testing cycle of over 72 hours, which is inefficient and cannot provide timely feedback to the production line for process adjustments, resulting in delayed product quality control and hindering rapid optimization and effective management. Summary of the Invention

[0003] The purpose of this invention is to provide a device for detecting internal stress in a diffuser plate, thereby solving the problems of excessive time consumption, low efficiency, and inability to provide timely guidance for production process adjustments in existing detection methods. This device accelerates the release of internal stress in the diffuser plate by simulating a high-temperature and high-humidity environment, enabling the detection of warping trends in a short time, thus providing timely and reliable data support for optimizing process parameters during production.

[0004] To achieve the above objectives, the following technical solution is adopted: A device for detecting internal stress in a diffuser plate includes a power distribution control box, a stainless steel water tank, a heating rod, a water pump motor, a water circulation pipeline, a temperature sensor, a temperature control system, and a sample carrier. The heating rod and temperature sensor are both installed inside the stainless steel water tank. The temperature control system is electrically connected to both the temperature sensor and the heating rod. The power distribution control box is electrically connected to the heating rod, the water pump motor, and the temperature control system. The water pump motor is connected to the water circulation pipeline, which forms a closed-loop connection with the stainless steel water tank. The sample carrier is located inside the stainless steel water tank and is used to hold the diffuser plate sample to be tested.

[0005] Furthermore, the sample carrier is a sample basket or a sample hanger, and the sample carrier is detachably connected to the inner wall of the stainless steel water tank.

[0006] Furthermore, the number of heating rods is at least one, and the heating rods are evenly distributed on the inner wall or bottom of the stainless steel water tank.

[0007] Furthermore, the water circulation pipeline includes an inlet pipe and an outlet pipe; one end of the inlet pipe is fixedly connected to the outlet of the water pump motor, and the other end extends into the interior of the stainless steel water tank; one end of the outlet pipe is connected to the upper side wall of the stainless steel water tank, and the other end is fixedly connected to the inlet of the water pump motor.

[0008] Furthermore, the temperature sensor is fixed to the middle of the inner wall of the stainless steel water tank, and the detection end of the temperature sensor faces the water inside the stainless steel water tank.

[0009] Furthermore, the power distribution control box is fixedly installed on the outer wall of the stainless steel water tank, and the temperature control system is integrated inside the power distribution control box and electrically connected to the circuit module of the power distribution control box.

[0010] Furthermore, the maximum bearing height of the sample carrier is lower than the maximum water level of the stainless steel water tank, and gaps are left between the sample carrier and the bottom and inner wall of the stainless steel water tank.

[0011] The beneficial effects of this utility model are: This device significantly improves testing efficiency. By simulating a high-temperature and high-humidity environment through a boiling water experiment, it reduces the traditional 72-hour testing time to less than two hours, enabling rapid quality feedback and process adjustment. Its simple structure and convenient operation, consisting of a stainless steel water tank, heating system, water circulation system, and temperature control system, make it compact and easy to implement for rapid testing on the production site. The device provides accurate and reliable test results. Through the synergistic effect of the water circulation and temperature control systems, it ensures uniform and stable water temperature, avoiding the influence of local temperature differences on the test results and accurately reflecting the warping trend after stress release in the diffuser plate. The device also boasts good applicability, equipped with an adjustable sample carrier to accommodate diffuser plate samples of different sizes and shapes, offering flexible use. Furthermore, the device integrates a power distribution control box and temperature control system, facilitating integration with existing production lines, supporting automation of the testing process and data recording, and possessing strong scalability and practicality. Attached Figure Description

[0012] Figure 1 A schematic diagram of a diffuser plate internal stress detection device according to an embodiment of the present invention is shown.

[0013] Figure 2 A schematic diagram of the electronic component connections of a diffuser plate internal stress detection device according to an embodiment of the present invention is shown.

[0014] Figure label: 1. Power distribution control box; 11. Circuit module; 2. Stainless steel water tank; 3. Heating rod; 4. Water pump motor; 5. Water circulation pipeline; 51. Inlet pipe; 52. Outlet pipe; 6. Temperature sensor; 7. Temperature control system; 8. Sample carrier; 81. Sample basket; 82. Sample hanger. Detailed Implementation

[0015] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0016] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples.

[0017] This utility model embodiment provides a device for detecting internal stress in a diffuser plate, such as... Figure 1 and Figure 2 As shown, the diffuser plate internal stress detection device includes a power distribution control box 1, a stainless steel water tank 2, a heating rod 3, a water pump motor 4, a water circulation pipeline 5, a temperature sensor 6, a temperature control system 7, and a sample carrier 8. The heating rod 3 and the temperature sensor 6 are both installed inside the stainless steel water tank 2. The temperature control system 7 is electrically connected to the temperature sensor 6 and the heating rod 3 respectively. The power distribution control box 1 is electrically connected to the heating rod 3, the water pump motor 4, and the temperature control system 7 respectively. The water pump motor 4 is connected to the water circulation pipeline 5, and the water circulation pipeline 5 and the stainless steel water tank 2 form a closed communication structure. The sample carrier 8 is set inside the stainless steel water tank 2 and is used to carry the diffuser plate sample to be tested.

[0018] The water pump motor 4 is connected to the water circulation pipe 5, driving the water circulation. The water circulation pipe 5 forms a closed-loop structure with the stainless steel water tank 2, which ensures continuous water flow within the tank, effectively eliminating localized water temperature differences and ensuring uniform temperature throughout the water area, providing a consistent and stable testing environment for the sample. The sample carrier 8 is located inside the stainless steel water tank 2 and is used to support the diffuser plate sample to be tested. Its design must ensure that the sample is completely submerged and that all surfaces are in full contact with the water during the test.

[0019] In this device, the specific structures of each component can be implemented in various ways. The following examples are merely illustrations and do not constitute a limitation on this utility model. For example, the sample carrier 8 can be a stainless steel sample basket with mesh, detachably connected to the support on the inner wall of the water tank via hooks; or it can be a frame-type sample hanger, suspended above the water tank via a slide rail. The heating rod 3 can be multiple U-shaped or straight rod-shaped electric heating elements, evenly arranged at the bottom or side wall of the stainless steel water tank 2 to improve heating efficiency and uniformity. The water circulation pipeline 5 can specifically include an inlet pipe and an outlet pipe. One end of the inlet pipe is connected to the outlet of the water pump motor 4, and the other end extends to the vicinity of the bottom of the water tank to inject water flow; the outlet pipe is connected to the upper part of the side wall of the water tank, leading the water back to the inlet of the water pump motor 4, thereby forming a circulation. The temperature sensor 6 is preferably a platinum resistance temperature probe, fixedly installed in the middle position of the inner side wall of the water tank, with its detection end extending into the water to monitor the water temperature in the core area in real time. The temperature control system 7 can be integrated into the power distribution control box 1. It adopts a PID control algorithm and sets and displays the target temperature through a touch screen or knob.

[0020] The device operates as follows: During testing, the cut diffuser plate sample is placed on the sample carrier 8 and then into the stainless steel water tank 2, with sufficient water to completely submerge the sample. The device is activated via the power control box 1, and a target temperature (e.g., a specific value between 60°C and 90°C) is set. The temperature control system 7, based on feedback from the temperature sensor 6, controls the heating rod 3 to rapidly raise the water temperature to and maintain it at the set value. Simultaneously, the water pump motor 4 drives the water to continuously flow in the water tank and circulation pipeline, ensuring uniform temperature distribution. The sample undergoes a water boiling treatment for a specified time (e.g., more than 30 minutes) in a constant temperature and circulating water environment, accelerating the release of internal stress under the hot and humid environment. After treatment, the sample is transferred to room temperature water to cool, and finally placed on a marble platform to measure its warpage. This process, through a controllable and uniform heating and circulation system, simulates the effects of long-term high temperature and high humidity environments on the diffuser plate in a short time, thereby quickly and accurately assessing its internal stress level and potential warpage risk.

[0021] In some embodiments, the sample carrier 8 can be used in conjunction with the stainless steel water tank 2 in the form of a sample basket 81 or a sample hanger 82. The sample basket 81 or sample hanger 82 can be detachably connected to the inner wall of the stainless steel water tank 2, for example, by providing a connection structure such as hooks, slots, or slide rails on the inside of the tank, allowing the sample carrier to be stably placed and easily accessed. The sample basket 81 can be a container with a mesh or grid structure, designed to ensure that water can flow freely and fully contact the sample; the sample hanger 82 can be designed as a frame structure, keeping the sample submerged by suspension. This detachable connection method not only facilitates sample loading and unloading but also facilitates cleaning and maintenance, while allowing for flexible selection or adjustment of the carrier method according to the sample size and shape, thereby adapting to the detection requirements of different specifications of diffusion plates. It should be noted that the specific structures of the sample basket 81 and sample hanger 82 described above are merely illustrative examples, and those skilled in the art can use other carrier structures with similar functions according to actual needs.

[0022] In some embodiments, the number of heating rods 3 can be set to at least one, depending on the volume of the stainless steel water tank 2 and the heating power requirements, and can be evenly arranged on the inner wall or bottom of the stainless steel water tank 2. This arrangement helps to transfer heat energy more evenly to the water body during the heating process, avoiding local overheating or uneven temperature distribution, thereby ensuring the consistency of the temperature of the entire water body and providing a stable and reliable heat treatment environment for the sample.

[0023] Specifically, the heating rod 3 can be a U-shaped, straight, or ring-shaped electric heating element, and is fixedly installed on the inner wall or bottom of the stainless steel water tank 2 by means of flanges, threads, or clips. For example, when multiple heating rods are used, they can be evenly arranged along the circumference of the side wall of the water tank, or distributed in an array at the bottom of the water tank to improve heating efficiency and temperature uniformity. The power and number of heating rods 3 can be matched and selected according to the heating rate and target temperature required for actual testing.

[0024] It should be noted that the type, quantity, and arrangement of the heating rods described above are merely examples and are not intended to limit the scope of this utility model. Those skilled in the art can adopt other heating structures or layouts with similar functions according to actual needs, such as using a surrounding heating tube or a bottom heating plate. As long as the function of uniform and stable heating can be achieved, they all fall within the protection scope of this utility model.

[0025] During the operation of this device, the heating rod 3 is activated under the control of the temperature control system 7. Through direct contact with the water, heat exchange occurs, causing the water temperature to rise rapidly to the set range. The uniformly distributed heating rods, combined with the flow effect of the water circulation pipeline 5, can further eliminate water temperature stratification, ensuring that the sample is heated uniformly during the heat treatment process. This allows for accurate and efficient simulation of the stress release effect of a high-temperature and high-humidity environment.

[0026] In some embodiments, the water circulation pipeline 5 may include an inlet pipe 51 and an outlet pipe 52. One end of the inlet pipe 51 is fixedly connected to the outlet of the water pump motor 4, and the other end extends into the interior of the stainless steel water tank 2, preferably to the lower part or near the bottom of the tank, so that water flows in from bottom to top, promoting water convection and temperature uniformity. One end of the outlet pipe 52 is connected to the upper part of the side wall of the stainless steel water tank 2, and the other end is fixedly connected to the inlet of the water pump motor 4, thereby forming a complete hydraulic circulation loop.

[0027] This structural design allows the water pump motor 4 to draw water from the top of the tank after starting, and then return the water to the tank from the bottom or lower middle part through the inlet pipe 51. This circulation process effectively breaks up water temperature stratification, reduces local temperature differences, and ensures that the entire water area maintains a uniform and stable temperature environment during the heating and heat preservation stages, providing consistent and reliable heat treatment conditions for the diffuser plate samples.

[0028] In practice, the inlet pipe 51 and outlet pipe 52 can be made of heat-resistant and corrosion-resistant materials, such as food-grade silicone tubing, stainless steel corrugated pipe, or PVC rigid pipe, and are securely connected to the interfaces of the water pump motor 4 and the stainless steel water tank 2 via flanges, quick-connect fittings, or threaded connections. A diverter or spray nozzle can be installed at the end of the inlet pipe 51 that extends into the water tank to further improve water flow distribution; a filter screen can be installed at the connection point between the outlet pipe 52 and the water tank to prevent impurities from entering the circulation system.

[0029] It should be understood that the specific structure, material, connection method, and extension position of the inlet and outlet pipes in the water tank described above are merely illustrative examples. In actual implementation, those skilled in the art can make adjustments according to the shape, capacity, and circulation efficiency requirements of the water tank, such as adopting a multi-inlet or multi-point return design, or optimizing the water flow path by combining a guide plate. Any structural modifications that can achieve stable and uniform circulating water flow are within the scope of this utility model's technical solution.

[0030] In some embodiments, the temperature sensor 6 is fixedly installed in the middle of the inner wall of the stainless steel water tank 2, with its sensing end facing the water area inside the stainless steel water tank 2. This arrangement allows the temperature sensor 6 to monitor the temperature of the water area in the middle of the tank in real time, which is usually the most representative area. This effectively avoids local temperature deviations caused by proximity to the heating rod, water surface, or tank wall, thereby providing an accurate and stable feedback signal to the temperature control system 7 and achieving precise control of the water temperature.

[0031] In other embodiments, the power distribution control box 1 is fixedly installed on the outer wall of the stainless steel water tank 2. The temperature control system 7 is integrated inside the power distribution control box 1 and is electrically connected to the circuit module 11 inside the power distribution control box 1. This integrated design concentrates the power control and temperature control of the entire device in one place, resulting in a compact structure that is easy to operate, observe, and maintain. The power distribution control box 1 can be an independent enclosure, which, in addition to the circuit module 11, can also be equipped with a display interface, control buttons, and protection components to achieve unified management of the power supply, start / stop, and parameter settings of the heating rod 3, water pump motor 4, and temperature control system 7.

[0032] In a further embodiment, the maximum bearing height of the sample carrier 8 is set below the maximum water level of the stainless steel water tank 2 to ensure that the sample is completely submerged in water during the test. Simultaneously, a certain gap is maintained between the sample carrier 8 and the bottom and inner wall of the stainless steel water tank 2. This gap ensures that water can circulate freely around the carrier and at the bottom, avoiding the formation of dead zones, thereby ensuring that heat and moisture are evenly transferred to all surfaces of the sample, improving the uniformity of test conditions and the consistency of results.

[0033] The above embodiments are only used to illustrate the present utility model and are not intended to limit the present utility model. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present utility model. Therefore, all equivalent technical solutions also fall within the scope of the present utility model. The patent protection scope of the present utility model should be defined by the claims.

Claims

1. A device for detecting internal stress in a diffuser plate, characterized in that, The device includes a power distribution control box, a stainless steel water tank, a heating rod, a water pump motor, a water circulation pipeline, a temperature sensor, a temperature control system, and a sample carrier. The heating rod and temperature sensor are both installed inside the stainless steel water tank. The temperature control system is electrically connected to the temperature sensor and the heating rod, and the power distribution control box is electrically connected to the heating rod, the water pump motor, and the temperature control system. The water pump motor is connected to the water circulation pipeline, which forms a closed-loop connection with the stainless steel water tank. The sample carrier is located inside the stainless steel water tank and is used to hold the diffusion plate sample to be tested.

2. The diffuser plate internal stress detection device according to claim 1, characterized in that, The sample carrier is a sample basket or a sample hanger, and the sample carrier is detachably connected to the inner wall of the stainless steel water tank.

3. The diffuser plate internal stress detection device according to claim 1, characterized in that, The number of heating rods is at least one, and the heating rods are evenly distributed on the inner wall or bottom of the stainless steel water tank.

4. The diffuser plate internal stress detection device according to claim 1, characterized in that, The water circulation pipeline includes an inlet pipe and an outlet pipe; one end of the inlet pipe is fixedly connected to the outlet of the water pump motor, and the other end extends into the stainless steel water tank; one end of the outlet pipe is connected to the upper side wall of the stainless steel water tank, and the other end is fixedly connected to the inlet of the water pump motor.

5. The diffuser plate internal stress detection device according to claim 1, characterized in that, The temperature sensor is fixed to the middle of the inner wall of the stainless steel water tank, and the detection end of the temperature sensor faces the water inside the stainless steel water tank.

6. The diffuser plate internal stress detection device according to claim 1, characterized in that, The power distribution control box is fixedly installed on the outer wall of the stainless steel water tank, and the temperature control system is integrated inside the power distribution control box and electrically connected to the circuit module of the power distribution control box.

7. The diffuser plate internal stress detection device according to claim 1, characterized in that, The maximum bearing height of the sample carrier is lower than the maximum water level of the stainless steel water tank, and there are gaps between the sample carrier and the bottom and inner wall of the stainless steel water tank.

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