LED lamp bead aging test device

Abstract

The utility model relates to test device technical field especially relates to a kind of LED lamp pearl ageing test device, at least two auxiliary temperature regulating units are arranged in thermostat, and the inside structure of the heat conduction shell in each auxiliary temperature regulating unit is provided with test cavity, and the first opening and the second opening that are communicated with test cavity are equipped on the heat conduction shell;Heating component is arranged on the first opening and the at least one side wall that is adjacent to the first opening on the heat conduction shell;Air supply component is arranged at the first opening;Control component is electrically connected with heating component and air supply component respectively, for heating component and air supply component power supply, and for controlling heating component and air supply component work, to adjust the temperature of corresponding test cavity.The utility model can be realized in the same thermostat flexible generation multiple target temperature environment, to carry out the LED lamp pearl comparison verification under multiple environmental temperature;And single thermostat integration modularization setting auxiliary temperature regulating unit, can reduce design difficulty and production cost.

Description

Technical Field

[0001] This utility model relates to the field of testing device technology, and in particular to an LED lamp bead aging testing device. Background Technology

[0002] The LED lamp bead aging test device is a specialized device that accelerates the aging process of LED lamp beads, such as light decay and color deviation, by simulating a high-temperature environment. Its main goal is to verify the reliability and lifespan of LED lamp beads in long-term use.

[0003] Currently, the existing constant temperature chambers for LED chip aging testing are modified to adapt existing chambers and incorporate independent aging supports within them. While the modified chambers can perform single LED chip aging tests, for comparative verification experiments requiring multiple ambient temperatures within the same chamber, multiple chambers are necessary. This increases experimental costs, reduces efficiency, and fails to meet the economic requirements of practical applications. Utility Model Content

[0004] This invention provides an LED lamp bead aging test device to solve the above-mentioned technical defects in the prior art. It can not only flexibly generate multiple target temperature environments in the same constant temperature chamber for comparative verification of LED lamp beads under various ambient temperatures, but also integrate a modular auxiliary temperature control unit into a single constant temperature chamber, which can reduce design difficulty and production costs.

[0005] This utility model provides an LED lamp bead aging test device, comprising: A constant temperature chamber has a constant temperature cavity inside. At least two auxiliary temperature control units are spaced apart in the constant temperature cavity, and each auxiliary temperature control unit includes: A heat-conducting housing has an internal test chamber. The heat-conducting housing has a first opening and a second opening, both of which are in communication with the test chamber. A heating element is disposed at the first opening, with at least one sidewall of the heat-conducting housing adjacent to the first opening; An air supply component is located at the first opening and is used to deliver the airflow heated by the heating component into the test chamber; A control component is electrically connected to the heating component and the air supply component, respectively, for supplying power to the heating component and the air supply component, and for controlling the operation of the heating component and the air supply component to adjust the temperature of the test chamber.

[0006] According to the LED lamp bead aging test device provided by this utility model, the heating component includes a heating wire; The heating wire is disposed in the first opening and at least one sidewall of the heat-conducting housing adjacent to the first opening, and the heating wire is arranged in parallel on the first opening and the corresponding sidewall.

[0007] According to the LED lamp bead aging test device provided by this utility model, the heating component also includes a heat insulation film; The heat insulation film is wrapped around the outside of the heating wire, and the edge of the heat insulation film is attached to the corresponding side wall of the heat-conducting housing. The heat insulation film is hollowed out at the position corresponding to the first opening.

[0008] According to the LED lamp bead aging test device provided by this utility model, the heating component further includes a flame-retardant heat insulation layer, which is disposed on the outside of the heat insulation film.

[0009] According to the LED lamp bead aging test device provided by this utility model, the air supply component includes a fan, and the fan is provided with at least two adjustment levels, and the wind speed can be adjusted by switching the corresponding adjustment levels.

[0010] According to the LED bead aging test device provided by this utility model, the control component includes: A heating controller, electrically connected to the heating element, is used to control the heating power of the heating element; An air supply controller, electrically connected to the air supply component, is used to control the rotation speed of the air supply component to adjust the wind speed; A constant current source is used to power the LED beads under test.

[0011] According to the LED lamp bead aging test device provided by this utility model, the control component further includes a temperature sensor, which is disposed in each of the test chambers and is used to detect the temperature of the corresponding test chamber.

[0012] According to the LED lamp bead aging test device provided by this utility model, the heat-conducting housing has a top wall, a bottom wall and four side walls; The first opening is located on the top wall, the second opening is located on the front side wall, and the heating component is located on the left side wall, right side wall, and rear side wall adjacent to the first opening.

[0013] According to the LED lamp bead aging test device provided by this utility model, the test chamber is provided with an aging plate mounting position for locking the tested LED lamp bead, and the mounting position is provided with at least one of screw holes, buckles and limiting grooves.

[0014] According to the LED lamp bead aging test device provided by this utility model, a positioning bracket is provided inside the constant temperature chamber, and a positioning structure is provided on the positioning bracket. Each of the auxiliary temperature control units is detachably mounted on the positioning bracket through the positioning structure.

[0015] The LED lamp bead aging test device provided by this utility model, by setting at least two auxiliary temperature control units in the constant temperature chamber as needed, each auxiliary temperature control unit includes a heat-conducting shell, a heating component and an air supply component. The heating component and the air supply component work together to realize the dynamic adjustment of the test chamber temperature in the heat-conducting shell. This not only enables the flexible generation of multiple target temperature environments in the same constant temperature chamber for comparative verification of LED lamp beads under various ambient temperatures, but also reduces the design difficulty and production cost by integrating modular auxiliary temperature control units into a single constant temperature chamber.

[0016] Compared to traditional methods that require multiple constant temperature chambers to support multi-temperature experiments, this invention integrates a single constant temperature chamber with a modularly configured auxiliary temperature control unit. Since only one basic constant temperature chamber is needed for the testing process, the auxiliary temperature control unit inside the chamber enables dynamic control of multiple temperature environments. This allows for comparative experiments on LED chips under various temperature conditions, saving on the purchase and maintenance costs of multiple constant temperature chambers. This effectively solves the problem of high testing costs associated with traditional constant temperature chambers that require multiple chambers for aging tests of LED chips of the same specification under different temperature conditions when using a fixed temperature field.

[0017] Meanwhile, the single auxiliary temperature control unit provided by this utility model can be assembled using standardized components, eliminating the need for special molds or high-precision processing. The circuit layout and control logic are simple, reducing research and development and manufacturing costs. The LED bead aging test device can adapt to the space requirements of LED beads of different sizes or multiple batches of experiments, improving the flexibility and reusability of the device. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of the LED lamp bead aging test device provided in this embodiment of the utility model.

[0020] Figure 2 This is an exploded view of the structure of a single auxiliary temperature control unit in the LED bead aging test device provided in this embodiment of the utility model.

[0021] Figure 3 This is a schematic diagram of the structure of a single auxiliary temperature control unit in the LED bead aging test device provided in this embodiment of the utility model.

[0022] Figure 4 This is a schematic diagram of the positioning bracket in the LED bead aging test device provided in this embodiment of the utility model.

[0023] Figure label: 10. Incubator; 20. Auxiliary temperature control unit; 21. Heat-conducting housing; 211. Test chamber; 212. First opening; 213. Second opening; 214. Mounting position; 22. Heating component; 221. Heating wire; 222. Heat insulation film; 23. Air supply component; 30. Control components; 31. Heating controller; 32. Air supply controller; 33. Constant current source; 40. Positioning bracket; 50. Aging board. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0026] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0027] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0028] Figure 1 This is a schematic diagram of the structure of the LED lamp bead aging test device provided in this embodiment of the utility model.

[0029] See Figure 1 This utility model provides an LED lamp bead aging test device, which includes a constant temperature chamber 10, at least two auxiliary temperature control units 20 and a control component 30.

[0030] The incubator 10 can be made of stainless steel. Its internal structure includes a temperature-controlled chamber, and its outer shell can be insulated (e.g., with polyurethane foam). An observation window is located on the side of the incubator 10. Four adjustable feet can be installed at the bottom of the incubator 10 to ensure it is placed horizontally. The incubator 10 can be used in simple scenarios requiring stable temperature, as well as in complex scenarios where temperature and humidity both significantly affect experimental results, such as in a constant temperature and humidity chamber.

[0031] At least two auxiliary temperature control units 20 are spaced apart within the constant temperature chamber, meaning there are at least two auxiliary temperature control units 20 spaced apart within the constant temperature chamber. Three, four, or more auxiliary temperature control units 20 can also be spaced apart within the constant temperature chamber. For example, the length, width, and height of the constant temperature chamber can be 80×80×150cm. Within this constant temperature chamber, according to testing requirements, three auxiliary temperature control units 20 with dimensions of 20×20×20cm are arranged horizontally, and four auxiliary temperature control units 20 with dimensions of 20×20×20cm are arranged vertically.

[0032] Each auxiliary temperature control unit 20 includes a heat-conducting housing 21, a heating element 22, and an air supply element 23.

[0033] The heat-conducting housing 21 can be a rectangular structure made of aluminum alloy or stainless steel. The internal structure of the heat-conducting housing 21 includes a test chamber 211. The heat-conducting housing 21 is provided with a first opening 212 (i.e., an air inlet) and a second opening 213 (i.e., an air outlet). Both the first opening 212 and the second opening 213 are connected to the test chamber 211. The edges of the openings are rounded to avoid airflow disturbance.

[0034] Heating component 22 is disposed at the first opening 212 and at least one sidewall of the heat-conducting housing 21 adjacent to the first opening 212. Heating component 22 is used to heat the heat-conducting housing 21 to raise the temperature of the test chamber 211.

[0035] The air supply component 23 is located at the first opening 212 (air inlet) and is used to send the airflow heated by the heating component 22 into the test chamber 211. When the air supply component 23 is in operation, the air in the constant temperature chamber is blown into the test chamber 211 through the first opening 212, heated by the heating component 22, and discharged from the second opening 213 (air outlet), forming an airflow circulation path.

[0036] The control component 30 is electrically connected to the heating component 22 and the air supply component 23 respectively, and is used to supply power to the heating component 22 and the air supply component 23, and to control the operation of the heating component 22 and the air supply component 23 to adjust the temperature of the test chamber 211.

[0037] The LED bead aging test device provided in this embodiment can set the temperature of the constant temperature chamber according to the minimum temperature required for accelerated aging of LED beads. For example, if the minimum aging temperature of some LED beads is 55°C, the ambient temperature of the constant temperature chamber can be set to 55°C. The auxiliary temperature control unit 20 for testing at the minimum aging temperature does not need to turn on the heating component 22 and the air supply component 23. However, if the auxiliary temperature control unit 20 requires a temperature higher than the minimum aging temperature, the heating component 22 and the air supply component 23 can be turned on as needed. This enables comparative testing of accelerated aging of LED beads of the same specification under different temperature environments, which not only saves chamber resources but also reduces the overall power consumption of the comparative experiment.

[0038] Specifically, when the temperature of the test chamber 211 of the auxiliary temperature control unit 20 is lower than the set value, which is higher than the minimum aging temperature of the LED lamp bead of 55°C, the heating component 22 is powered on and generates heat, and the heat is diffused to the test chamber 211 through the air supply component 23 until the temperature of the test chamber 211 reaches the set value.

[0039] Once the temperature of the test chamber 211 reaches the target, the heating element 22 can switch to intermittent heating mode (by adjusting the on / off time through a PID controller) to compensate for the heat loss of the test chamber 211 to the surrounding environment and maintain a stable temperature.

[0040] It is understood that the LED lamp bead aging test device provided in this embodiment of the present invention, by setting at least two auxiliary temperature control units 20 in the constant temperature chamber 10 as needed, each auxiliary temperature control unit 20 includes a heat-conducting shell 21, a heating component 22 and an air supply component 23, the heating component 22 and the air supply component 23 can work together to realize the dynamic adjustment of the temperature of the test chamber 211 in the heat-conducting shell 21, not only can multiple target temperature environments be flexibly generated in the same constant temperature chamber 10 for comparative verification of LED lamp beads under various ambient temperatures; moreover, the modular auxiliary temperature control unit 20 integrated in a single constant temperature chamber 10 can reduce design difficulty and production cost.

[0041] Compared to traditional methods that require multiple constant temperature chambers 10 to support multi-temperature experiments, this embodiment integrates a single constant temperature chamber 10 with a modularly configured auxiliary temperature control unit 20. Since only one basic constant temperature chamber 10 is needed for the testing process, the auxiliary temperature control unit 20 is added inside the chamber to achieve dynamic control of multiple temperature environments. This allows for comparative experiments on LED beads under multiple temperature conditions, saving on the purchase and maintenance costs of multiple constant temperature chambers 10. This effectively solves the problem of high testing costs associated with traditional constant temperature chambers 10, which require multiple chambers to support aging tests of LED beads of the same specification under different temperature conditions when conducting such tests.

[0042] Meanwhile, the single auxiliary temperature control unit 20 provided by this utility model can be assembled using standardized components, eliminating the need for special molds or high-precision processing. The circuit layout and control logic are simple, reducing research and development and manufacturing costs. The LED bead aging test device can adapt to the space requirements of LED beads of different sizes or multiple batches of experiments, improving the flexibility and reusability of the device.

[0043] Figure 2 This is an exploded view of the structure of a single auxiliary temperature control unit 20 in the LED bead aging test device provided in this embodiment of the utility model. Figure 3 This is a schematic diagram of the structure of a single auxiliary temperature control unit 20 in the LED lamp bead aging test device provided in this embodiment of the utility model.

[0044] See Figure 2 and Figure 3 In some embodiments of this utility model, the heating component 22 includes a heating wire 221, which is disposed in the first opening 212 and at least one sidewall of the heat-conducting housing 21 adjacent to the first opening 212. The heating wire 221 is arranged in parallel on the first opening 212 and the corresponding sidewall. The heating wire 221 converts electrical energy into heat energy to provide controllable heat to the environment within the auxiliary temperature control unit 20.

[0045] The heating wire 221 can be made of nickel-chromium alloy, with a nickel-plated surface to prevent oxidation. The heating wire 221 is wound in a serpentine or spiral shape around the first opening 212 and along the side wall of the heat-conducting housing 21. The heating wire 221, in conjunction with the metal wall (aluminum alloy / stainless steel) of the heat-conducting housing 21, facilitates rapid heat conduction, preventing localized overheating. Both ends of the heating wire 221 are connected to the heating controller 31 of the control assembly 30 via silicone wires.

[0046] In the LED lamp bead aging test device involving multiple auxiliary temperature control units 20, each auxiliary temperature control unit 20 is independently equipped with a heating wire 221, which can simultaneously realize parallel testing of multiple temperature zones (such as 55℃, 70℃, 85℃), thereby improving experimental efficiency and reducing the production cost of the test device.

[0047] See Figure 2 and Figure 3 In some embodiments of this utility model, the heating component 22 further includes a heat insulation film 222, which is wrapped around the outside of the heating wire 221. The edge of the heat insulation film 222 is attached to the corresponding side wall of the heat-conducting housing 21, and the heat insulation film 222 is hollowed out at the position corresponding to the first opening 212.

[0048] The heat insulation film 222 includes a polyimide film or a ceramic fiber film. The heat insulation film 222 is wrapped around the outside of the heating wire 221 to prevent heat from being directly lost to the outside of the heat-conducting housing 21.

[0049] In some embodiments of this utility model, the heating component 22 further includes a flame-retardant heat insulation layer (not shown in the figure), which is disposed on the outside of the heat insulation film 222.

[0050] Flame-retardant insulation layers are often made of porous or fibrous flame-retardant materials, with common types including flame-retardant foam plastics (such as XPS extruded polystyrene boards and polyurethane) or inorganic fibers (rock wool and glass wool). The flame-retardant insulation layer blocks heat conduction through an air layer, while adding flame retardants (such as bromine-based and phosphorus-based compounds) or using inherently flame-retardant materials to meet fire safety requirements.

[0051] See Figure 2 and Figure 3 In some embodiments of this utility model, the air supply component 23 includes a fan, which has at least two adjustable speeds, such as low speed, medium speed and high speed, and the wind speed can be adjusted by switching the corresponding adjustable speed.

[0052] Because the heat generated by the heating wire 221 will preferentially propagate upwards, the test cavity 211 will have obvious temperature stratification in the vertical direction (height direction) (such as low temperature at the bottom and high temperature at the top), which cannot meet the experimental requirement for uniform temperature throughout the entire area.

[0053] To address this, a fan works in conjunction with the heating wire 221. The fan forces airflow (forced convection), improving heat transfer efficiency and overcoming the limitations of the heating wire 221's heating capability. When the fan is running, the air circulates at a certain speed, quickly carrying the heat generated by the heating wire 221 to all corners of the test chamber 211, shortening the time required to reach the desired temperature. Simultaneously, forced convection overcomes the limitations of natural convection, creating a circulation loop within the test chamber 211, thereby homogenizing the temperature distribution in both the vertical and horizontal directions.

[0054] Continue reading Figure 1 In some embodiments of this utility model, the control component 30 includes a heating controller 31, an air supply controller 32, and a constant current source 33.

[0055] The heating controller 31 is electrically connected to the heating element 22 and is used to control the heating power of the heating element 22. That is, the heating controller 31 can use PWM (pulse width modulation) technology or a linear constant current / constant voltage circuit to control the average power of the heating wire 221 by adjusting the duty cycle or output current.

[0056] The air supply controller 32 is electrically connected to the air supply component 23 and is used to control the rotation speed of the air supply component 23 to adjust the air speed. That is, the air supply controller 32 is based on an H-bridge drive circuit or a DC-DC converter and controls the speed of the fan motor by adjusting the input voltage or PWM frequency, such as switching between low speed and high speed.

[0057] The constant current source 33 is electrically connected to the LED beads inside the test chamber 211 to power the LED beads under test. That is, the constant current source 33 relies on a precision operational amplifier, a sampling resistor, and a feedback circuit to monitor and adjust the output current in real time.

[0058] When the components of the LED lamp bead aging test device are designed with independent power supply, the constant current source 33, the air supply controller 32, and the heating controller 31 are connected to different power sources (such as AC power and batteries), and there is no electrical connection between them. They communicate with the main controller only through signal buses (such as RS485 and CAN). The constant current source 33 supplies power to the LED lamp bead under test separately. The air supply controller 32 is directly connected to AC power and supplies power to the fan motor through an internal AC-DC conversion module. The heating controller 31 is connected to AC power and directly controls the on / off state of the heating wire 221 through a relay or solid-state relay.

[0059] When the components in the LED lamp bead aging test device adopt a unified power supply and distributed power supply design, the constant current source 33, air supply controller 32, and heating controller 31 may share the same main power supply (such as mains power or battery), distribute electrical energy through internal circuits, and work together through control signals. The constant temperature chamber 10 can be powered independently using its own power cord.

[0060] In some embodiments of this utility model, the control component 30 further includes a temperature sensor (not shown in the figure), which is disposed in each test chamber 211 and is used to detect the temperature of the corresponding test chamber 211.

[0061] The temperature sensor can be a multi-channel thermometer. The probes of the multi-channel thermometer are inserted into the corresponding test chambers 211 to detect the temperature of the corresponding test chambers 211 in real time and feed the detected temperature of the corresponding test chambers 211 back to the main controller. The main controller dynamically adjusts the current of the corresponding heating wire 221 (e.g., from 500W to 700W) and the fan speed (e.g., from low speed to medium speed) through the heating controller 31 to achieve rapid convergence and long-term maintenance of the target temperature, and ensure the consistency of experimental conditions for LED lamp bead aging under different temperature environments.

[0062] Continue reading Figure 2 and Figure 3 In some embodiments of this utility model, the heat-conducting housing 21 has a top wall, a bottom wall and four side walls; wherein, the first opening 212 (air inlet) is provided on the top wall, the second opening 213 (air outlet) is provided on the front side wall, and the heating component 22 is provided on the left side wall, the right side wall and the rear side wall adjacent to the first opening 212.

[0063] Because hot air, being less dense, naturally rises, the circulating air introduced into the constant temperature chamber 10 through the air inlet on the top wall flows downwards and is eventually discharged from the air outlet on the front side wall. With the help of the fan, the air can be actively driven to flow along the path of the top wall, left and right side walls, rear side wall and front side wall, shortening the residence time of the air in the chamber and improving the heat exchange efficiency.

[0064] Since the aging board 50 of the LED beads is usually placed horizontally in the accommodating cavity, its surroundings (front, back, left, right, and top) need to be heated evenly. The multi-faceted heating component 22 can simultaneously heat the top of the LED beads (radiative heat from the top wall heating component 22), the left and right sides (convective heat from the left and right side wall heating components 22), and the rear (conductive heat from the rear side wall heating component 22), simulating an omnidirectional thermal environment, which is closer to the actual application scenario.

[0065] In some embodiments of this utility model, the interior of the test cavity 211 is provided with a mounting position 214 for locking the aging board 50 of the LED lamp bead under test. The mounting position 214 is provided with at least one of screw holes, buckles and limiting grooves.

[0066] In LED bead aging tests, the aging board 50 needs to be exposed to a high-temperature environment for extended periods. A single fixing method (such as using only screws or clips) can easily cause the aging board 50 to loosen due to thermal expansion, vibration, and other factors, affecting test accuracy. This invention improves reliability by combining multiple fixing methods.

[0067] Furthermore, the aging board 50 varies in size and structure for different models of LED beads. Traditional fixing methods require custom mounting positions 214 for each type of aging board 50, resulting in high costs and low efficiency. This utility model achieves flexible adaptation through a combination of multiple types of fixing interfaces.

[0068] It should be noted that the aging plate 50 can be directly attached to the bottom wall of the test chamber 211 via the mounting position 214, or it can be suspended in the center of the test chamber 211. The specific setting should be confirmed according to the actual situation.

[0069] Figure 4 This is a schematic diagram of the positioning bracket 40 in the LED lamp bead aging test device provided in this embodiment of the utility model.

[0070] See Figure 4 In some embodiments of this utility model, a positioning bracket 40 is provided inside the constant temperature cavity, and a positioning structure (not shown in the figure) is provided on the positioning bracket 40. Each auxiliary temperature control unit 20 is detachably mounted on the positioning bracket 40 through the positioning structure.

[0071] The positioning bracket 40 can be designed as a "grid" or "interlocking" frame according to the internal dimensions of the constant temperature cavity, ensuring that the auxiliary temperature control units 20 are evenly distributed and have maintenance access. The positioning structure is the connection interface between the auxiliary temperature control units 20 and the positioning bracket 40, and needs to achieve functions such as quick positioning, reliable fixing, and detachability. The positioning structure may include screw holes, slots, or guide grooves.

[0072] When the auxiliary temperature control unit 20 is pre-positioned through the slot or guide groove, and then quickly locked by the elastic buckle or bolt, the installation time can be shortened and the efficiency of experimental preparation can be improved.

[0073] Continue reading Figures 1 to 4 The LED bead aging test device provided in this embodiment of the utility model can randomly select four specifications of LED beads, labeled as type A, B, C, and D, according to experimental requirements, with 15 pieces of each type of LED bead, and conduct accelerated aging comparative verification in environments of 55℃, 70℃, and 85℃, implemented according to the following steps: First, confirm the specifications (such as rated voltage, current, luminous efficacy, etc.) of the LED beads to be tested (types A, B, C, and D). Randomly select 15 pieces of each type of LED bead and check for any damage to the appearance and oxidation of the leads. Prepare an aging board 50 with dimensions compatible with the test chamber 211. Solder the LED beads to be tested onto the aging board 50. The aging board 50 extends into the test chamber 211 through the second opening 213 and is fixed inside the test chamber 211.

[0074] Confirm the dimensions of the constant temperature chamber 10, such as 80cm × 80cm × 150cm (length × width × height). Since the length of the constant temperature chamber 10 is 80cm, when a single auxiliary temperature control unit 20 with a volume of 20cm × 20cm × 20cm is placed horizontally, it occupies 20cm in both the length and width directions, matching the 80cm width of the constant temperature chamber 10. Therefore, 3 sets can be placed horizontally (3 × 20cm = 60cm ≤ 80cm, reserving 20cm for operation space). The height of the constant temperature chamber 10 is 150cm. When a single auxiliary temperature control unit 20 with a volume of 20cm × 20cm × 20cm is placed vertically, it occupies 20cm in the height direction. Therefore, 7 layers can be placed (7 × 20cm = 140cm ≤ 150cm). However, to avoid poor heat dissipation from the top, 4 layers are actually selected (4 × 20cm = 80cm, reserving 70cm for the top insulation layer).

[0075] Therefore, according to the testing requirements, three auxiliary temperature control units 20, each with dimensions of 20×20×20cm, are arranged horizontally within the constant temperature chamber, and four auxiliary temperature control units 20, each with dimensions of 20×20×20cm, are arranged vertically. The spacing between two adjacent auxiliary temperature control units 20 is greater than or equal to 15cm, preferably 18cm.

[0076] Then, the LED beads of types A, B, C and D are soldered to the corresponding aging boards 50 respectively. 15 pieces of the same type of LED beads are soldered to each aging board 50, arranged in a 5×3 matrix with a spacing of 5mm. After soldering, a multimeter is used to check for short circuits and cold solder joints.

[0077] The aging plates 50, which are welded with the first type (such as type A), are respectively locked to each test chamber 211 of the first row of auxiliary temperature control units 20, and are located near the bottom of the test chamber 211. Five aging plates 50 are locked to each test chamber 211.

[0078] The aging plates 50, which are welded with other types of plates, are locked to the test chambers 211 in the remaining auxiliary temperature control units 20 in the same way as the test chambers 211 in the first row of auxiliary temperature control units 20. M4 stainless steel screws are used to lock the fixing holes on the edge of the aging plates 50 to the threaded holes (pre-machined) on the inner wall of the test chambers 211, ensuring that the aging plates 50 are level and do not wobble.

[0079] Multiple heating wires 221 are evenly laid along the inner wall of each auxiliary temperature control unit 20, and the connecting wires of the heating wires 221 are led out to the constant temperature chamber. A fan is installed in the center of the top wall of each auxiliary temperature control unit 20, and the power cord of the fan is led out along the side wall of the constant temperature chamber. The positive and negative power cords of each aging board 50 are led out to the outside through the wire passage hole in the side wall of the constant temperature chamber, and the wire ends are insulated with heat shrink tubing.

[0080] Use black cable ties to bundle the connecting wires of the heating wire 221, the fan, and the aging board 50 inside the constant temperature chamber in the order of power input, heating, heat dissipation, and signal, to avoid tangling; all wires are led out through the wire holes reserved on the side wall of the constant temperature chamber 10 (the holes are sealed with rubber sealing rings to prevent the constant temperature chamber 10 from leaking air), and the external wires are fixed with nylon cable ties to avoid pulling.

[0081] Close the door of the constant temperature chamber 10, turn on the temperature control system, set the target temperature of the constant temperature chamber 10 to 55℃, adjust the current of the heating wire 221 of the second and third auxiliary temperature control units 20 in each row and the fan speed, and use the probe of the multi-channel thermometer to detect the temperature of each test chamber 211 in the auxiliary temperature control unit 20, and control the temperature of the test chamber 211 in the second and third auxiliary temperature control units 20 in each row to rise to 70℃ and 85℃ respectively.

[0082] After confirming that the temperature of all test chambers 211 is stable, power the aging board 50 with an external power supply and turn on the LED lamp bead aging mode (continuous lighting).

[0083] The LED beads were removed in 7-day cycles, and their luminous flux or radiation intensity was tested using an integrating sphere. After the test, they were put back in to verify the aging degree of the LED beads.

[0084] After running continuously for 72 hours (standard accelerated aging time), turn off the power to the heating wire 221, fan, and aging board 50 of the constant temperature chamber 10; after the constant temperature chamber 10 has cooled naturally to room temperature (approximately 25°C), remove the aging board 50. Perform a visual inspection on the LED beads on each aging board 50 (check for cracked beads or detached packages), and conduct photoelectric performance tests (using an integrating sphere to measure luminous flux and color coordinates), recording the data before and after aging.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. An LED bead aging test device, characterized in that, include: A constant temperature chamber has a constant temperature cavity inside. At least two auxiliary temperature control units are spaced apart in the constant temperature cavity, and each auxiliary temperature control unit includes: A heat-conducting housing has an internal test chamber. The heat-conducting housing has a first opening and a second opening, both of which are in communication with the test chamber. A heating element is provided at the first opening, and at least one sidewall of the heat-conducting housing adjacent to the first opening; An air supply component is located at the first opening and is used to deliver the airflow heated by the heating component into the test chamber; A control component is electrically connected to the heating component and the air supply component, respectively, for supplying power to the heating component and the air supply component, and for controlling the operation of the heating component and the air supply component to adjust the temperature of the test chamber.

2. The LED lamp bead aging test device according to claim 1, characterized in that, The heating element includes a heating wire; The heating wire is disposed in the first opening and at least one sidewall of the heat-conducting housing adjacent to the first opening, and the heating wire is arranged in parallel on the first opening and the corresponding sidewall.

3. The LED lamp bead aging test device according to claim 2, characterized in that, The heating component also includes a heat insulation film; The heat insulation film is wrapped around the outside of the heating wire, and the edge of the heat insulation film is attached to the corresponding side wall of the heat-conducting housing. The heat insulation film is hollowed out at the position corresponding to the first opening.

4. The LED lamp bead aging test device according to claim 3, characterized in that, The heating component also includes a flame-retardant insulation layer, which is disposed on the outside of the heat insulation film.

5. The LED lamp bead aging test device according to claim 1, characterized in that, The air supply component includes a fan, which has at least two adjustable speeds, and the wind speed can be adjusted by switching the corresponding adjustable speed.

6. The LED lamp bead aging test device according to claim 1, characterized in that, The control component includes: A heating controller, electrically connected to the heating element, is used to control the heating power of the heating element; An air supply controller, electrically connected to the air supply component, is used to control the rotation speed of the air supply component to adjust the wind speed; A constant current source is used to power the LED beads under test.

7. The LED lamp bead aging test device according to claim 6, characterized in that, The control component also includes a temperature sensor, which is disposed in each of the test chambers and is used to detect the temperature of the corresponding test chamber.

8. The LED lamp bead aging test apparatus according to any one of claims 1 to 7, characterized in that, The heat-conducting housing has a top wall, a bottom wall, and four side walls; The first opening is located on the top wall, the second opening is located on the front side wall, and the heating component is located on the left side wall, right side wall, and rear side wall adjacent to the first opening.

9. The LED lamp bead aging test apparatus according to any one of claims 1 to 7, characterized in that, The test chamber has an installation position for mounting an aging board to be fitted with the LED beads under test. The installation position has at least one of a screw hole, a clip, and a limiting groove.

10. The LED bead aging test apparatus according to any one of claims 1 to 7, characterized in that, The constant temperature cavity is provided with a positioning bracket, and the positioning bracket is provided with a positioning structure. Each of the auxiliary temperature control units is detachably mounted on the positioning bracket through the positioning structure.

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