Application of Thermal Shock Test Chamber

Thermal shock test chamber is an indispensable test equipment for aviation, automotive, home appliances, scientific research and other fields, used to test and determine the parameters and performance of electrical, electronic and other products and materials after temperature environment changes in high temperature, low temperature, alternating humidity and heat degree or constant test; Or constant humid heat test after the temperature environment changes the parameters and performance. Applicable to schools, factories, research positions, etc.

1, the high and low temperature impact test chamber with automatic, high-precision system loop, any part action, fully PLC locking processing, all use PID automatic calculation control, high temperature control precision, advanced scientific air circulation cycle design, make the indoor temperature uniform, avoid any dead corners; The complete protection device avoids any possible hidden dangers and ensures the long-term reliability of the equipment.

2, high and low temperature impact test chamber adopts advanced measuring device, and the controller adopts a large color LCD man-machine touch dialogue LCD man-machine interface controller, which is simple to operate, easy to learn, stable and reliable, and displays the complete system operation status, execution and setting program curve in Chinese and English. With 96 test specifications independently set, impact time 999 hours 59 minutes, cycle cycle 1~999 times can be set, can realize the automatic operation of the refrigerator, to a large extent to achieve automation, reduce the workload of the operator, can automatically start and stop working at any time.

3, The left side of the chamber has a test hole with a diameter of 50mm, which can be used for wiring test parts with external power load. Can be independently set high temperature, low temperature and cold and thermal shock three different conditions of the function, and in the implementation of cold and thermal shock conditions, you can choose two or three trough and cold flushing, hot flushing impact function, with high and low temperature testing machine function.

Comparison of Climatic Test and Environmental Test

Climate environment test -- constant temperature and humidity test chamber, high and low temperature test chamber, cold and hot shock test chamber, wet and heat alternating test chamber, rapid temperature change test chamber, linear temperature change test chamber, walk-in constant temperature and humidity test chamber, etc. They all involve temperature control.

Because there are multiple temperature control points to choose from, the climate chamber temperature control method also has three solutions: inlet temperature control, product temperature control and "cascade" temperature control. The first two are single-point temperature control, and the third is two-parameter temperature control.

Single point temperature control method has been very mature and widely used.

Most of the early control methods were "ping-pong" switch control, commonly known as heating when it's cold and cooling when it's hot. This control mode is a feedback control mode. When the temperature of the circulating air flow is higher than the set temperature, the electromagnetic valve of refrigeration is opened to deliver cold volume to the circulating air flow and reduce the temperature of the air flow. Otherwise, the circuit switch of the heating device is switched on to directly heat the circulating air flow. Raise the temperature of the air stream. This control mode requires that the refrigeration device and heating components of the test chamber are always in a standby working state, which not only wastes a lot of energy, but also the controlled parameter (temperature) is always in an "oscillation" state, and the control accuracy is not high.

Now the single-point temperature control method is mostly changed to the universal proportional differential integral (PID) control method, which can give the controlled temperature correction according to the past change of the controlled parameter (integral control) and the change trend (differential control), which not only saves energy, but also the "oscillation" amplitude is small and the control accuracy is high.

Dual-parameter temperature control is to collect the temperature value of the air inlet of the test chamber and the temperature value near the product at the same time. The air inlet of the test chamber is very close to the installation position of the evaporator and heater in the air modulation room, and its magnitude directly reflects the air modulation result. Using this temperature value as the feedback control parameter has the advantage of quickly modulating the status parameters of the circulating air.

The temperature value near the product indicates the real temperature environmental conditions suffered by the product, which is the requirement of the environmental test specification. Using this temperature value as the parameter of feedback control can ensure the effectiveness and credibility of the temperature environmental test, so this approach takes into account the advantages of both and the requirements of the actual test. The dual-parameter temperature control strategy can be the independent "time-sharing control" of the two groups of temperature data, or the weighted two temperature values can be combined into one temperature value as a feedback control signal according to a certain weighting coefficient, and the value of the weighting coefficient is related to the size of the test chamber, the wind speed of the circulating air flow, the size of the temperature change rate, the heat output of the product work and other parameters.

Because heat transfer is a complex dynamic physical process, and is greatly affected by the atmospheric environment conditions around the test chamber, the working state of the tested sample itself, and the complexity of the structure, it is difficult to establish a perfect mathematical model for the temperature and humidity control of the test chamber. In order to improve the stability and accuracy of control, fuzzy logic control theory and method are introduced in the control of some temperature test chambers. In the control process, the thinking mode of human is simulated, and the predictive control is adopted to control the temperature and humidity space field more quickly.

Compared with the temperature, the selection of humidity measurement and control points is relatively simple. During the circulation flow of the well-regulated humid air into the high and low temperature cycle test chamber, the exchange of water molecules between the wet air and the test piece and the four walls of the test chamber is very small. As long as the temperature of the circulating air is stable, the circulating air flow from entering the test chamber to exiting the test chamber is in the process. The moisture content of wet air changes very little. Therefore, the relative humidity value of the detected air at any point of the circulating air flow field in the test box, such as the inlet, the middle stream of the flow field or the return air outlet, is basically the same. Because of this, in many test chambers that use the wet and dry bulb method to measure humidity, the wet and dry bulb sensor is installed at the return air outlet of the test chamber. Moreover, from the structural design of the test box and the convenience of maintenance in use, the wet and dry bulb sensor used for relative humidity measurement and control is placed at the return air inlet for easy installation, and also helps to regularly replace the wet bulb gauze and clean the temperature sensing head of the resistance PT100, and according to the requirements of the GJB150.9A wet heat test 6.1.3. The wind speed passing through the wet-bulb sensor should not be lower than 4.6m/s. The wet-bulb sensor with a small fan is installed at the return air outlet for easier maintenance and use.

Comparison of Natural Convection Test Chamber, Constant Temperature and Humidity Test Chamber and High Temperature Oven

Instructions:

Home entertainment audio-visual equipment and automotive electronics are one of the key products of many manufacturers, and the product in the development process must simulate the adaptability of the product to temperature and electronic characteristics at different temperatures. However, when using a general oven or thermohumidity machine to simulate the temperature environment, either the oven or thermohumidity machine has a test area equipped with a circulating fan, so there will be wind speed problems in the test area.

During the test, the temperature uniformity is balanced by rotating the circulating fan. Although the temperature uniformity of the test area can be achieved through the wind circulation, the heat of the product to be tested will also be taken away by the circulating air, which will be significantly inconsistent with the actual product in the wind-free use environment (such as the living room, indoor).

Because of the relationship of wind circulation, the temperature difference of the product to be tested will be nearly 10℃, in order to simulate the actual use of environmental conditions, many people will misunderstand that only the test machine can produce temperature (such as: oven, constant temperature wet machine) can carry out natural convection test, in fact, this is not the case. In the specification, there are special requirements for wind speed, and a test environment without wind speed is required. Through the natural convection test equipment and software, the temperature environment without passing through the fan (natural convection) is generated, and the test integration test is performed for the temperature detection of the product under test. This solution can be used for home related electronics or real-world ambient temperature testing in confined Spaces (e.g., large LCD TVS, car cockpits, automotive electronics, laptops, desktops, game consoles, stereos). Etc.).

Unforced air circulation test specification :IEC-68-2-2, GB2423.2, GB2423.2-89 3.31 The difference between the test environment with or without wind circulation and the test of products to be tested:

Instructions:

If the product to be tested is not energized, the product to be tested will not heat itself, its heat source only absorbs the air heat in the test furnace, and if the product to be tested is energized and heated, the wind circulation in the test furnace will take away the heat of the product to be tested. Every 1 meter increase in wind speed, its heat will be reduced by about 10%. Suppose to simulate the temperature characteristics of electronic products in an indoor environment without air conditioning, if an oven or a constant temperature humidifier is used to simulate 35 ° C, although the environment can be controlled within 35 ° C through electric heating and compressor, the wind circulation of the oven and the thermohumidifier will take away the heat of the product to be tested. So that the actual temperature of the product to be tested is lower than the temperature under the real windless state, it is necessary to use a natural convection testing machine without wind speed to effectively simulate the actual windless environment (indoor, no starting car cockpit, instrument chassis, outdoor waterproof box... Such environment).

Comparison table of wind speed and IC product to be tested:

Description: When the ambient wind speed is faster, the IC surface temperature will also take away the IC surface heat due to the wind cycle, resulting in the faster the wind speed and the lower the temperature.

Definition and Characteristics of UV Weathering Test Chamber

    Uv weathering test chamber is a professional equipment used to simulate and evaluate the resistance of materials to ultraviolet radiation and corresponding climatic conditions. Its core function is to simulate the effect of ultraviolet light on materials in the natural environment through artificially controlled ultraviolet radiation, temperature and humidity changes, so as to conduct comprehensive and systematic tests on the durability, color stability and physical properties of materials. In recent years, with the development of science and technology and the continuous improvement of material performance requirements, the application of UV weathering test chambers has become more and more extensive, covering plastics, coatings, rubber, textiles and other fields.

    The characteristics of the equipment are mainly reflected in its high efficiency and accuracy. First of all, the UV weathering test chamber uses a high-intensity ultraviolet lamp, which emits an ultraviolet spectrum close to sunlight, which can accurately simulate the lighting conditions in the real environment. Secondly, it has a real-time monitoring and control system, which can precisely regulate the internal temperature, humidity and UV intensity to ensure the stability of the test process and the reliability of the results. In addition, the internal material and structural design of the test chamber is also particularly important, which usually uses corrosion resistant and oxidation resistant materials to extend the service life of the equipment and improve the accuracy of the test.

    In addition, the application of UV weathering test chamber is not only limited to the aging detection of materials, but also can predict and improve the performance of materials, making manufacturers more forward-looking and scientific in material selection and product design. The use of this equipment to a large extent reduces the quality problems caused by the lack of weather resistance of the product and improves the market competitiveness of the product. Therefore, in the material research and development, the UV weathering test chamber can be described as an indispensable auxiliary tool, which helps enterprises quickly detect and optimize material properties to meet the changing needs of the market.

    In short, UV weathering test chamber, as an advanced testing technology, is leading the progress and innovation in the field of materials science. With the increasing demand for environmentally friendly materials and long-lasting products, the importance of such equipment will only become more prominent. Its scientific, reliable and efficient will help all walks of life to develop more high-quality products to cope with more unknown challenges in the future.

High and Low Temperature Test Standard of PC Plastic Material

1. High temperature test

    After being placed at 80±2℃ for 4 hours and at normal temperature for 2 hours, the dimensions, insulation resistance, voltage resistance, key function, and loop resistance meet the normal requirements, and there are no abnormal phenomena such as deformation, warping, and degumming in appearance. The key convex point collapses at high temperature and the press force becomes smaller without assessment.

2. Low temperature test

After being placed at -30±2℃ for 4 hours and at normal temperature for 2 hours, the dimensions, insulation resistance, voltage resistance, key function, and loop resistance meet normal requirements, and there are no abnormal phenomena such as deformation, warping, and degumming in appearance.

3. Temperature cycle test

Put in 70±2℃ environment for 30 minutes, take out at room temperature for 5 minutes; Leave in -20±2℃ environment for 30 minutes, remove and leave at room temperature for 5 minutes. After such 5 cycles, the dimensions, insulation resistance, voltage resistance, key function, circuit resistance meet the normal requirements, and the appearance of no deformation, warping, degumming and other abnormal phenomena. The key convex point collapses at high temperature and the press force becomes smaller without assessment.

4. Heat resistance

After being placed in an environment with a temperature of 40±2℃ and a relative humidity of 93±2%rh for 48 hours, the dimensions, insulation resistance, voltage resistance, key function, and loop resistance meet normal requirements, and the appearance is not deformed, warped, or degumped. The key convex point collapses at high temperature and the press force becomes smaller without assessment.

National standard value for plastic testing:

Gb1033-86 Plastic density and relative density test method

Gbl636-79 Test method for apparent density of moulding plastics

GB/ T7155.1-87 Thermoplastic pipe and pipe fittings density determination part: polyethylene pipe and pipe fittings reference density determination

GB/ T7155.2-87 Thermoplastic pipes and fittings -- Determination of density -- Part L: Determination of density of polypropylene pipes and fittings

GB/T1039-92 General rules for testing mechanical properties of plastics

GB/ T14234-93 Surface roughness of plastic parts

Gb8807-88 plastic mirror gloss test method

Test method for tensile properties of GBL3022-9L plastic film

GB/ TL040-92 Test method for tensile properties of plastics

Test method for tensile properties of GB/ T8804.1-88 thermoplastic pipes polyvinyl chloride pipes

GB/ T8804.2-88 Test methods for tensile properties of thermoplastic pipes Polyethylene pipes

Hg2-163-65 plastic low temperature elongation test method

GB/ T5471-85 Method for preparing thermosetting molding specimens

HG/ T2-1122-77 thermoplastic sample preparation method

GB/ T9352-88 thermoplastic compression sample preparation

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Solar Module Test Project

1. solar module reliability test specification:

The reliability test of the solar module is to confirm the performance of the solar module (early), and the test specifications for the module are mainly IEC61215, IEC61646, UL1703 three test specifications. IEC61215 is suitable for crystalline (Si) modules; IEC61646 is suitable for thin-film (Thin-flm) modules; The UL1703 is suitable for both crystalline and thin film solar modules. In addition, the GB and CNS solar energy specifications are partially modified from the IEC.

2. the relationship and importance of Macro Exhibition and solar energy test projects:

According to IEC61215, IEC61646 test items a total of about 10 (solar module test items corresponding to the general table). Among them, the test equipment manufactured by Hongjian will be used, and the relevant test conditions are temperature cycling (Thermal cycling, 10.11). There are three categories of Humidity freeze (10.12) and Damp heat (10.13), while UL1703 only has two items of temperature cycle wet freezing without the item of damp heat.

3. Thermal cycling test (Thermal cycling)lEC61215-10-11:

Solar module temperature cycle test is used to determine the fatigue, thermal failure, or other stress failure caused by repeated changes in temperature of the module. The current number of temperature cycles is 200 times, and the future trend will be 600 times (according to the test results of the American Association for Renewable Energy [NREL], the power degradation rate of 600 times is greater than 200 times as much as twice).

Through the temperature cycle: defects of the module can be found: crack growth, module cracks, warping, sealing material delamination, point shedding, glass corrosion... Let's wait.

Temperature conditions: Low temperature :-40℃, high temperature :85°C(IEC), 90 °C(UL), the fastest temperature variability (average):100 °C /h, 120 °C /h, relevant measurements need to be carried out during the test (using the Qingsheng solar energy measurement system), the test process needs to measure the module: module surface temperature, voltage and current, ground continuity, insulation... Let's wait.

4. the purpose of the temperature cycle test process through bias:

Temperature cycle test process, the specification requires through bias, the purpose of the test is to make the defective Cell heat to accelerate aging and accelerate failure test purposes, so it needs to be energized above 25℃ during the temperature cycle process, the laboratory in the United States has statistics, It was found that the difference between the failure rate of the solar module with power and without power is as high as 30%, and the experimental data indicates that if there is no power, the solar module is not easy to fail in the temperature cycle environment, so when carrying out the temperature cycle test of the solar cell (Cel)& module, it needs to be matched with a special measurement system.

5. the introduction of wet freezing test lEC61215-10-12:

Description: To determine whether the component is sufficiently resistant to corrosion damage and the ability of moisture expansion to expand the material molecules, frozen moisture is the stress to determine the cause of failure. For the product to be tested, the test stress is high temperature and high humidity (85℃/85%R.H) to low temperature (-40℃ humidity 85%R.H). Maintain to 25℃), and low temperature rise to high temperature and high humidity, rather than 85℃/85%R.H./20 hours, 85℃/85%R.H./20 hours, the purpose of 85℃/85%R.H./20 hours is to let the module surrounding full of water, 20 hours dwell time is too short, is not enough for water to penetrate into the module and junction box inside.

Through wet freezing test: Module defects can be found: cracks, warping, severe corrosion, lamination of sealing materials, failure of adhesive delamination junction box & water accumulation, wet insulation **... Etc.

Test conditions: 85 ℃ / 85% R.H. (h) 20-40 ℃ (0.5 ~ 4 h), maximum heat up 100, 120 ℃ / h, and maximum temperature of 200 ° C/h.

6. Purpose of wet freezing test:

The wet freezing test method is mainly to perform two kinds of damage to the solar module in a snowy environment.

(1). High temperature and humidity (85℃/85%R.H.) drop to -4℃ before 25℃, humidity should be controlled at 85%+5% RH. The purpose of this is to simulate the high humidity sudden change before the snow.

Before the snow, the environment will show a high humidity state, and when the temperature drops to 0℃, the water gas around the module and the junction box sealant will freeze. When the water gas freezes, its volume will expand to 1.1 times of the original, and the destruction method of ice expansion after the water gas penetrates the material gap through the water gas to achieve the purpose of this test. At present, the statistical results of wet freezing have the highest damage to junction box sealant, which will cause junction box degumming and water, and the failure ratio of module is estimated at 7%.

(2). The purpose of heating up from low temperature (-40℃) and humidity (50℃/85%R.H.) is to simulate the temperature rise in the module at sunrise in a snowy climate. Although the outdoor environment is still below 0℃, the solar module will generate electricity when there is light, and because the snow is still on the module, the heat spot effect will occur in the module. The temperature inside the module will also reach 50 ° C.

7. wet heat test (Damp heat) test IEC61215-10-13:

Description: To determine the ability of the module to resist long-term moisture penetration, according to the test results of BP Solar, its 1000 hours is not enough. The actual condition is found that the time to make the module have problems needs at least 1250 hours. According to the current requirements of the specification, the wet heat test process is not powered on, but the future trend is also to be powered on (positive and reverse bias), because it can accelerate the aging and failure of solar cells.

Test conditions: 85℃/85%R.H., time :1000 hours Defects can be found through the wet and thermal test: CELL delamination EVA(delamination, discoloration, bubble formation, atomization, Browning), connection line blackening, TCO corrosion, spot corrosion, Thin-film yellow discoloration, junction box degumming off

Working Principle of UV Weathering Test Chamber

Uv weathering test chamber is a kind of experimental equipment specially used to test the durability and stability of materials and products under ultraviolet radiation. Its working principle revolves around mimicking UV radiation conditions in the natural environment to assess how materials behave when exposed to sunlight for long periods of time. The chamber is equipped with a series of high-intensity ultraviolet light sources that effectively emit ultraviolet light in a specific wavelength range, mimicking the UV-A and UV-B bands of natural sunlight.

During the test, the sample is placed in the test chamber, and ultraviolet radiation will cause changes in the chemical structure of the surface of the material, such as color fading, strength reduction and brittleness increase. At the same time, the test chamber can also be combined with environmental factors such as temperature and humidity for a more comprehensive evaluation of the sample. For example, the humidity control system in the laboratory can simulate the effects of rain and moisture, while the temperature control equipment can reproduce extreme hot or cold conditions.

By exposing the samples to multiple rounds of ultraviolet radiation at different time periods, researchers were able to collect a large amount of experimental data and analyze the aging resistance and service life of the samples in depth. These data play a vital role in material development, product quality control and market demand analysis. In addition, the use of UV weathering test chambers also helps companies anticipate possible performance problems before the launch of new products, so as to make timely adjustments and improvements.

Such tests are not only applicable to plastics, coatings, fibers and other materials, but also widely used in various industries such as automobiles, construction fields and even electronic products. By studying the performance of products in different climatic conditions, companies can improve the competitiveness of their products in the market, but also contribute to the environmental cause, because good weather resistance products usually mean a longer life cycle and less material waste.

In short, UV weathering test chambers play a key role in materials science and product development, not only allowing developers to better grasp material properties, but also for consumers to bring higher quality and more durable products. In the future development of science and technology, with the continuous progress of ultraviolet weathering test technology, we may be able to witness the birth of more new materials and new products, adding more convenience and beauty to our lives.

Are you tired of the hassle and labor-intensive process of manually cutting ceramic tiles? Look no further! Introducing the Professional Automatic Electric 45 Degree Portable Tile Cutter, the cutting-edge tool that will revolutionize your tile cutting experience. Whether you’re a seasoned professional or a DIY enthusiast, this powerful device offers unique features and benefits that will make tile cutting a breeze.

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Aluminum extrusion is a versatile technology that allows the creation of custom aluminum profiles used in various industries. To meet growing demands for precision and efficiency, the 5000T Aluminum Extrusion Machine has emerged as a game-changer. Designed to push the boundaries of aluminum extrusion, this state-of-the-art machinery offers unrivaled capabilities and benefits.

Unleashing the Power of Aluminum Extrusion Press Machine

The Aluminum Extrusion Press Machine is the backbone of the aluminum extrusion process. With its robust construction and advanced features, it delivers exceptional performance and productivity. The 5000T Aluminum Extrusion Machine stands out among its competitors due to its impressive capacity and cutting-edge technology.

Precision and Efficiency in Aluminium Profile Extrusion

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Embrace Custom Extrusion Equipment

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The Aluminum Extrusion Press Factory Advantage

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Note: The word count for this article is intentionally left undisclosed to maintain a seamless reading experience.

Plastic extrusion technology has seen significant advancements in recent years, particularly in the production of PET and PLA plastic sheets. PET (polyethylene terephthalate) and PLA (polylactic acid) are two popular types of thermoplastic polymers that are widely used in various industries. The development of specialized extrusion machines has revolutionized the production process, resulting in improved efficiency and higher-quality sheets.

PET Extruder: Enhancing Efficiency and Product Quality

PET extruders play a pivotal role in the manufacturing of PET plastic sheets. These machines are designed to melt and shape PET pellets into thin, uniform sheets of various thicknesses. With the advancement in technology, modern PET extruders come equipped with innovative features that enhance efficiency and product quality.

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PLA Plastic Extruding Machine: Eco-Friendly Solution

With the growing demand for environmentally friendly alternatives, PLA plastic extruding machines have gained popularity. PLA, derived from renewable resources such as corn starch or sugarcane, is biodegradable and compostable. The extrusion process for PLA is similar to that of PET, but with adjustments to accommodate its unique properties.

PLA extruders are equipped with specialized screws and heating elements tailored to PLA’s lower melting point. This allows for proper melting and extrusion of PLA pellets into sheets. The eco-friendly nature of PLA makes it a preferred choice for various applications such as food packaging, disposable tableware, and 3D printing.

PET and PLA Sheet Extruding Machines: Pioneering Innovation

PET sheet extruding machines have been at the forefront of plastic extrusion technology for many years. With recent advancements, PET extruders can now produce sheets with enhanced clarity, strength, and durability. They are widely used in packaging, automotive, and construction industries, among others.

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In conclusion, the advancements in PET and PLA sheet extrusion have revolutionized the plastic manufacturing industry. PET extruders have improved efficiency and product quality, while PLA extruders offer an eco-friendly solution. These machines pave the way for sustainable and innovative applications, driving us towards a more sustainable future.