المدونة

• Flame-retardant PP Materials in Industry Working Principle

  Oct 27, 2025

  Polypropylene (PP) itself is a highly flammable hydrocarbon with a limiting oxygen index (LOI) of only 17.8%. It will continue to burn even after being removed from the fire source. The core principle of flame-retardant PP is to interrupt or delay its combustion cycle through physical and chemical means. Combustion requires the simultaneous existence of three elements: combustible material, heat and oxygen. The function of flame retardants is to destroy this "burning triangle".   In industry, flame retardancy is mainly achieved by adding flame retardants to PP. Different types of flame retardants function through the following mechanisms: 1. Gas-phase flame retardant mechanism This is one of the most common mechanisms, especially applicable to traditional halogen-based flame retardants. When flame retardants are heated and decomposed, they can capture the free radicals (such as H· and HO·) that maintain the combustion chain reaction in the combustion reaction zone (flame), causing their concentrations to drop sharply and thus interrupting the combustion. 2. Condensed phase flame retardant mechanism This is the most mainstream mechanism of halogen-free flame-retardant PP. Flame retardants promote the formation of a uniform and dense carbon layer on the surface of polymers. This layer of carbon has three major functions. The first step is to prevent external heat from entering the interior of the polymer. Secondly, it prevents the escape of flammable gases inside and the entry of external oxygen. Finally, it inhibits the further pyrolysis of the polymer and the generation of smoke. When a fire occurs, the acid source promotes the dehydration, cross-linking and carbonization of the carbon source. Meanwhile, the large amount of gas produced by the decomposition of the gas source causes the softened carbon layer to expand, eventually forming a porous, dense and strong foam carbon layer, which protects the underlying PP like "armor". 3. Cooling/heat absorption mechanism Flame retardants absorb a large amount of heat during the decomposition process, reducing the surface temperature of polymers and making it difficult for them to continuously pyrolyze and produce flammable gases. Typical representatives include aluminium hydroxide (ATH) and magnesium hydroxide (MH). When they decompose, they absorb a large amount of heat (endothermic reaction) and release water vapor. The water vapor can not only dilute flammable gases but also play a cooling role. 4. Dilution mechanism Flame retardants decompose to produce a large amount of non-flammable gases (such as water vapor and CO₂, etc.), which can dilute the concentration of flammable gases and oxygen near the polymer surface, making combustion unsustainable. Both the gas sources of metal hydroxides and intumescent flame retardants have this function.   In conclusion, the working principle of flame-retardant PP in industry is a complex process involving the synergy of multiple mechanisms. Modern flame-retardant PP technology is developing towards halogen-free, low smoke, low toxicity and high efficiency. Among them, the condensed phase flame-retardant mechanism represented by intumescent flame retardants (IFR) is the core of current research and application. By carefully designing flame-retardant formulas, the best balance can be achieved among flame-retardant efficiency, material mechanical properties, processing performance and cost.

  العلامات الساخنة : فرن بدرجة حرارة عالية غرفة اختبار درجة حرارة عالية غرفة اختبار درجة حرارة منخفضة غرفة اختبار درجة الحرارة القابلة للبرمجة معدات اختبار درجة الحرارة فرن الدقة

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• Customized Solution for Double-Door Temperature Test Equipment

  Oct 25, 2025

  1.Core customization requirement analysis 1.1 The standard box size or load-bearing capacity (such as automotive parts, large unmanned aerial vehicles, and entire cabinet servers) cannot meet the requirements. Special sample racks, trays or suspension devices are required. The test samples need to be powered on and run inside the box, and connected to cables or pipes (such as battery pack charge and discharge tests, engine component tests). Oil stains, particulate matter or corrosive gases may be released during the sample testing process. 1.2 It needs to be connected with mechanical arms and AGV carts to achieve automatic loading and unloading. The heating and cooling rates required far exceed the standard specifications (such as >15°C/min). 1.3 The equipment needs to adapt to specific room sizes, door opening sizes or floor heights. There are special requirements for the power supply (if it cannot meet 380V) and the cooling water source (if a cooling tower cannot be provided).   2. Key customized technical specifications 2.1 Customized Dimensions The internal effective space is determined entirely based on the size and quantity of the customer's samples. The minimum distance between the sample and the box wall needs to be considered to ensure uniform airflow. It is necessary to clearly define the size of the door, the material of the sealing strip, the door lock mechanism (mechanical lock, pneumatic auxiliary lock), and the size and quantity of the observation window. The inner box is usually made of SUS304 stainless steel. The outer box body can be made of high-quality steel plate with plastic spraying or SUS304. For corrosive tests, more durable materials should be specified. Test holes are used for leads. The size, quantity and position of the hole diameters (such as left or right) need to be customized, and sealing plugs or flanges should be provided. 2.2 Confirm the test interval The technical index standards for temperature are usually from -70°C to +150°C. The standard heating and cooling rate is 1 to 3°C/min. Linear rapid temperature change: 5 to 10°C/min. Nonlinear rapid temperature change: Customizable to 15°C/min or even higher. This is directly related to the power configuration of the refrigeration and heating systems and is a key factor influencing the cost. Customize stricter control accuracy, such as uniformity ≤±1.0°C and fluctuation ≤±0.5°C. 2.3 Refrigeration System Air cooling: Suitable for sites where the ambient temperature is not high and the ventilation around the equipment is good. Water cooling: It is suitable for large cooling capacity, high heat generation samples, or situations with high ambient temperatures. It is more efficient but requires a cooling tower. Cascade refrigeration: It is used for low-temperature requirements below -40°C and usually adopts two-stage cascade. 2.4 Installation Method The refrigeration system of the integrated machine is located at the top or bottom of the box, with a compact structure and convenient installation. The split-type refrigeration unit is separated from the box body and is suitable for high-power equipment. It can discharge noise and heat to the outside, but the installation is complex. 2.5 Control System and Software The controller customizes the size and brand of the color touch screen, supports multi-segment programming, program group loops, step jumps, etc. Customized LAN interface for connecting to the upper computer (computer) for data monitoring and recording. Whether it is necessary to support remote network monitoring and operation, as well as customize record intervals and storage capacity. 2.6 Independent sample over-temperature protector. Compressor overheat, overcurrent and overpressure protection; Fan overcurrent protection Cooling water cut-off protection and automatic stop test function when the door is opened; Leakage or short-circuit protection; Sound and light alarm prompt.   Customizing double-door temperature test equipment is a systematic project. The key to success lies in the clarification and refinement of the initial requirements. A detailed and unambiguous "Technical Requirements Document" serves as the cornerstone for communication between equipment suppliers and customers. It ensures that the final delivered equipment fully complies with testing, process, and site requirements, avoiding subsequent disputes and cost overruns.

  العلامات الساخنة : فرن صناعي فرن فراغ فرن الدقة Smart Oven High-temperature Testing Equipmen Environmental Reliability Testing

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• How is over-temperature protection carried out in a temperature test chamber?

  Oct 23, 2025

  The over-temperature protection of the temperature test chamber is a multi-level and multi-redundant safety system. Its core purpose is to prevent the temperature inside the chamber from rising out of control due to equipment failure, thereby protecting the safety of the test samples, the test chamber itself and the laboratory environment.   The protection system usually consists of the following key parts working together: 1. Sensor: The main sensor is used for the normal temperature control of the test chamber and provides feedback signals to the main controller. An independent over-temperature protection sensor is the key to a safety system. It is a temperature-sensing element independent of the main control temperature system (usually a platinum resistance or thermocouple), which is placed by strategically at the position within the box that best represents the risk of overheating (such as near the heater outlet or on the top of the working chamber). Its sole task is to monitor over-temperature. 2. Processing unit: The main controller receives signals from the main sensor and executes the set temperature program. The independent over-temperature protector, as an independent hardware device, is specifically designed to receive and process the signals from the over-temperature protection sensor. It does not rely on the main controller. Even if the main controller crashes or experiences a serious malfunction, it can still operate normally. 3. Actuator: The main controller controls the on and off of the heater and the cooler. The safety relay/solid-state relay receives the signal sent by the over-temperature protector and directly cuts off the power supply circuit of the heater. This is the final execution action.   The over-temperature protection of the temperature test chamber is a multi-level, hard-wire connected safety system designed based on the concepts of "redundancy" and "independence". It does not rely on the main control system. Through independent sensors and controllers, when a dangerous temperature is detected, it directly and forcibly cuts off the heating energy and notifies the user through sound and light alarms, thus forming a complete and reliable safety closed loop.

  العلامات الساخنة : غرفة اختبار درجات الحرارة العالية والمنخفضة غرفة اختبار الصدمة الحرارية غرفة اختبار الرطوبة غرفة اختبار درجة الحرارة معدات اختبار درجة الحرارة Precision Ove

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• The Applicability of Temperature Test Chambers to the Testing of Household Environmental Products

  Oct 18, 2025

  A variety of products used in home environments (more common test objects) such as televisions, air conditioners, refrigerators, washing machines, smart speakers, routers, etc., as well as environmental protection products used to improve the home environment: such as air purifiers, fresh air systems, water purifiers, humidifiers/dehumidifiers, etc. No matter which category it is, as long as it needs to work stably for a long time in a home environment, it must undergo strict environmental reliability tests. The high and low temperature test chamber is precisely the core equipment for accomplishing this task.   The home environment is not always warm and pleasant, and products will face various harsh challenges in actual use. This mainly includes regional climate differences, ranging from the severe cold in Northeast China (below -30°C) to the scorching heat in Hainan (up to over 60°C in the car or on the balcony). High-temperature scenarios such as kitchens close to stoves, balconies exposed to direct sunlight, and stuffy attics, etc. Or low-temperature scenarios: warehouses/balconies without heating in northern winters, or near the freezer of refrigerators. The high and low temperature test chamber, by simulating these conditions, "accelerates" the aging of products in the laboratory and exposes problems in advance.   The actual test cases mainly cover the following aspects: 1. The smart TV was continuously operated at a high temperature of 55°C for 8 hours to test its heat dissipation design and prevent screen flickering and system freezing caused by overheating of the mainboard. 2. For products with lithium batteries (such as cordless vacuum cleaners and power tools), conduct charge and discharge cycles at -10°C to assess the battery performance and safety at low temperatures and prevent over-discharge or fire risks. 3. The air purifier (with both types of "environmental product" attributes) undergoes dozens of temperature cycles between -20°C and 45°C to ensure that its plastic air ducts, motor fixing frames and other structures will not crack or produce abnormal noises due to repeated thermal expansion and contraction. 4. Smart door lock: High-temperature and high-humidity test (such as 40°C, 93%RH) to prevent internal circuits from getting damp and short-circuited, which could lead to fingerprint recognition failure or the motor being unable to drive the lock tongue.   High and low temperature test chambers are not only applicable but also indispensable for the testing of household environmental products. By precisely controlling temperature conditions, it can ensure user safety and prevent the risk of fire or electric shock caused by overheating or short circuits. Ensure that the product can work stably in different climates and home environments to reduce after-sales malfunctions. And it can predict the service life of the product through accelerated testing. Therefore, both traditional home appliance giants and emerging smart home companies will take high and low temperature testing as a standard step in their product development and quality control processes.

  العلامات الساخنة : غرفة اختبار درجات الحرارة العالية والمنخفضة غرفة اختبار الرطوبة بدرجة حرارة عالية ومنخفضة Cold and Hot Environment Test Chamber Low Humidity Environment Test Chamber High Temperature Aging Test Chamber Reliability Testing Equipment

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• Lab Aging Test Chamber Working Principle

  Oct 17, 2025

  Many products (such as rubber, plastic, insulating materials, electronic components, etc.) will age due to the combined effects of heat and oxygen when exposed to the natural environment over a long period of use, such as becoming hard, brittle, cracking, and experiencing a decline in performance. This process is very slow in its natural state. The air-exchange aging test chamber greatly accelerates the aging process by creating a continuously high-temperature environment and constantly replenishing fresh air in the laboratory, thereby evaluating the long-term heat aging resistance of materials in a short period of time.   The working principle of Lab aging test chamber mainly relies on the collaborative efforts of three systems: 1. The heating system provides and maintains a high-temperature environment inside the test chamber. High-performance electric heaters are usually adopted and installed at the bottom, back or in the air duct of the test chamber. After the controller sets the target temperature (for example, 150°C), the heater starts to work. The air is blown through the heater by a high-power fan. The heated air is forced to circulate inside the box, causing the temperature inside the box to rise evenly and remain at the set value. 2. The ventilation system is the key that distinguishes it from ordinary ovens. At high temperatures, the sample will undergo an oxidation reaction with oxygen in the air, consuming oxygen and generating volatile products. If the air is not exchanged, the oxygen concentration inside the box will decrease, the reaction will slow down, and it may even be surrounded by the products of the sample's own decomposition. This is inconsistent with the actual usage of the product in a naturally ventilated environment. 3. The control system precisely controls the parameters of the entire testing process. The PID (Proportional-integral-Derivative) intelligent control mode is adopted. The real-time temperature is fed back through the temperature sensor inside the box (such as platinum resistance PT100). The controller precisely adjusts the output power of the heater to ensure that the temperature fluctuation is extremely small and remains stable at the set value. Set the air exchange volume within a unit of time (for example, 50 air changes per hour). This is one of the core parameters of the air-exchange aging test chamber, which usually follows relevant test standards (such as GB/T, ASTM, IEC, etc.).   The test chamber creates a high-temperature environment through electric heaters, achieves uniform temperature inside the box by using centrifugal fans, and continuously expels exhaust gases and draws in fresh air through a unique ventilation system. Thus, under controllable experimental conditions, it simulates and accelerates the aging process of materials in a naturally ventilated thermal and oxygen environment. The biggest difference between it and a common oven lies in its "ventilation" function, which enables its test results to more truly reflect the heat aging resistance of the material during long-term use.

  العلامات الساخنة : غرفة اختبار درجة الحرارة غرفة اختبار الشيخوخة فرن الدقة Drying Test Chamber Weathering Test Chamber Aging Test Equipment

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• Lab Thermal Resistance Sensing Core Working Principle

  Oct 16, 2025

  The core of the thermal resistance induction in high and low temperature test chambers also utilizes the physical property that the resistance value of platinum metal changes with temperature. The core logic of the control system is a closed-loop feedback control: measurement → comparison → regulation → stability   Firstly, the thermal resistance sensor senses the current temperature inside the chamber and converts it into a resistance value. The measurement circuit then converts the resistance value into a temperature signal and transmits it to the controller of the test chamber. The controller compares this measured temperature with the target temperature set by the user and calculates the deviation value. Subsequently, the controller outputs instructions to the actuator (such as the heater, compressor, liquid nitrogen valve, etc.) based on the magnitude and direction of the deviation. If the measured temperature is lower than the target temperature, start the heater to heat up; otherwise, start the refrigeration system to cool down. Through such continuous measurement, comparison and adjustment, the temperature inside the box is eventually stabilized at the target temperature set by the user and the required accuracy is maintained.   Due to the fact that high and low temperature test chambers need to simulate extreme and rapidly changing temperature environments (such as cycles from -70°C to +150°C), the requirements for thermal resistance sensors are much higher than those for ordinary industrial temperature measurement.   Meanwhile, there is usually more than one sensor inside the high and low temperature test chamber. The main control sensor is usually installed in the working space of the test chamber, close to the air outlet or at a representative position. It is the core of temperature control. The controller decides on heating or cooling based on its readings to ensure that the temperature in the working area meets the requirements of the test program. The monitoring sensors may be installed at other positions inside the box to verify with the main control sensors, thereby enhancing the reliability of the system. Over-temperature protection is independent of the main control system. When the main control system fails and the temperature exceeds the safety upper limit (or lower limit), the monitoring sensor will trigger an independent over-temperature protection circuit, immediately cutting off the heating (or cooling) power supply to protect the test samples and equipment safety. This is a crucial safety function.   Lab thermal resistance sensor is a precision component that integrates high-precision measurement, robust packaging, and system safety monitoring. It serves as the foundation and "sensory organ" for the entire test chamber to achieve precise and reliable temperature field control.

  العلامات الساخنة : غرفة اختبار درجة حرارة عالية غرفة اختبار درجة حرارة منخفضة غرفة اختبار الصدمة الحرارية غرفة اختبار درجة الحرارة القابلة للبرمجة فرن الدقة Intelligent Testing Instruments

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• Cascade Compression Refrigeration Working Principle

  Oct 15, 2025

  Cascade compression refrigeration mainly consists of two independent refrigeration cycles and a heat exchanger connected to them. The high-temperature stage recycles medium-temperature refrigerants, high-temperature stage compressors, high-temperature stage condensers, expansion valves, and evaporative condensers. The low-temperature stage recycles components such as low-temperature refrigerants, low-temperature stage compressors, and expansion valves.   The work mainly includes four processes: compression, condensation, throttling and evaporation. Low-temperature stage cycle: The low-temperature refrigerant is compressed in the low-temperature stage compressor, with its pressure and temperature increasing. The high-temperature and high-pressure low-temperature refrigerant vapor then enters the evaporative condenser. Here, it is not cooled by ambient air or cooling water, but by the refrigerant liquid that evaporates and absorbs heat in the high-temperature stage cycle, thereby releasing heat and condensing into a high-pressure liquid. This is the core of the cascade system! Subsequently, the high-pressure low-temperature refrigerant liquid passes through the low-temperature stage throttling valve, where the pressure drops sharply, transforming into a low-temperature and low-pressure gas-liquid two-phase mixture. This gas-liquid mixture enters the low-temperature stage evaporator, absorbing the heat of the object to be cooled (such as the heat inside the freezer), and completely evaporates into low-temperature and low-pressure vapor, thereby achieving the purpose of refrigeration. The low-temperature and low-pressure vapor after evaporation is once again drawn into the low-temperature stage compressor to complete the cycle. 2. High-temperature stage cycle: The high-temperature refrigerant is compressed in the high-temperature stage compressor, with its pressure and temperature increasing. The high-temperature and high-pressure refrigerant vapor enters the condenser (usually cooled by air or water), releasing heat to the ambient medium and condensing into a high-pressure liquid. The high-temperature refrigerant liquid under high pressure passes through the high-temperature stage throttling valve, causing a sudden drop in pressure and transforming into a medium-temperature and low-pressure gas-liquid two-phase mixture. The mixture enters the evaporative condenser, absorbing the heat released by the refrigerant vapor from the low-temperature stage cycle (i.e., serving as the cold source for the low-temperature stage), and evaporates into low-pressure vapor. The low-pressure vapor after evaporation is once again drawn into the high-temperature stage compressor to complete the cycle.   Cascade refrigeration can reach a temperature range of -60°C to -150° C. Each stage of the cycle operates within its own reasonable compression ratio range, ensuring high compressor efficiency and reliable operation. Compared with the single-stage cycle that barely achieves low temperatures, the cascade system has a higher energy efficiency ratio under the design conditions. At the same time, it avoids problems such as excessively high exhaust temperature and deterioration of lubricating oil in single-stage systems at high compression ratios, and enables the selection of the most suitable refrigerants for the temperature zones of the high and low-temperature stages respectively.

  العلامات الساخنة : Two Chambers of Thermal Shock Test Chamber Three-chamber Thermal Shock Test Chamber Basket Impact Test Chamber Thermal Shock Equipment High and Low Temperature Testing Experiment High and Low Temperature Test Chamber Equipment Refrigeration

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• The Function of Adding Nitrogen Input to Industrial Ovens

  Oct 14, 2025

  The core function of adding nitrogen input in industrial ovens is to create an inert atmosphere environment with low oxygen or no oxygen. This is usually referred to as "nitrogen protection" or "nitrogen-filled baking".   Preventing oxidation is the most common and primary purpose. When heated in the air (with an oxygen content of approximately 21%), many materials will undergo oxidation reactions, thereby affecting product quality. Adding nitrogen input to industrial ovens can prevent the formation of oxide scale (such as rust) on the surface of metal products during heating, keep the metal bright and clean, and improve the quality of subsequent processes such as electroplating and spraying. Or to prevent the oxidation of component pins, pads and precision films at high temperatures, ensuring the quality of soldering and the long-term reliability of the product. At the same time, it can also prevent chemical and powder materials from undergoing chemical reactions with oxygen at high temperatures, thereby altering their chemical properties. 2. Some materials pose a risk of fire or explosion in high-temperature and oxygen-rich environments. Increasing nitrogen input can suppress combustion and explosion. In industries such as printing and coating, a large amount of flammable organic solvents (such as alcohol, acetone, and toluene) are volatilized during the baking process. Introducing nitrogen to reduce the oxygen concentration below the limit oxygen concentration can completely eliminate the risk of fire and explosion, which is an important safety measure. For metal and plastic powders, when they reach a certain concentration in the air, they are highly prone to explosion when exposed to open flames or high temperatures. Nitrogen protection can create a safe processing environment. 3. Improve process control and product quality. Heating in an oxygen-free or low-oxygen environment can avoid many side reactions caused by oxygen. In processes such as chip manufacturing and solar cell production, extremely high cleanliness and an oxygen-free environment are essential to prevent the oxidation of silicon wafers, metal electrodes, etc., ensuring extremely high product yield and performance. 4. While filling the oven with nitrogen, the air that originally contained moisture and oxygen inside the oven will also be "driven out". This not only prevents oxidation but also plays an auxiliary drying role, making it particularly suitable for products that are extremely sensitive to moisture.   In conclusion, adding nitrogen input to industrial ovens is to actively control the heating environment rather than passively heating in the air. This is an important technical means used in high-end manufacturing and precision processing.

  العلامات الساخنة : فرن صناعي فرن فراغ فرن خال من الغبار Hot Air Circulation Oven Explosion-proof Oven Experimental Drying Oven

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• Lab Dust Free Oven Environmental Test Condition

  Oct 11, 2025

  Internal environmental conditions Benchmark cleanliness: At the beginning of the test, the chamber must reach the highest cleanliness level it claims (such as ISO Class 5 / Class 100). This is the premise of all tests. Before the test, the oven needs to run a long period of "self-cleaning" until the particle count shows that the concentration is stable below the standard for multiple consecutive times. Temperature and Humidity: Although the oven is a heating device, its initial state needs to be clearly defined. The initial environment for testing is usually normal temperature and humidity, for example, a temperature of 20±5°C and a relative humidity of 30-60% RH. This is crucial for testing the heating time and temperature uniformity. If the process has requirements for the dew point of the environment, it may be necessary to record the initial absolute humidity. Airflow state: The test should be conducted under the specified airflow pattern, typically in a vertical or horizontal laminar flow state. The fan must operate at the rated speed, with stable air pressure and air volume. Test load: The test is divided into two conditions: no-load and full-load. No-load is the benchmark test for equipment performance. Fill the effective working space with a fully loaded simulated load (such as metal, pallets, etc.) to simulate the harshest working conditions. Full-load testing can truly reflect the impact of products on air flow and temperature fields in actual production.   External environmental conditions 1. The cleanliness level of the external environment must be lower than or equal to the cleanliness level designed by the oven itself. For instance, when testing an oven of Class 100, it is best to do it in a room of Class 1000 or cleaner. If the external environment is too dirty, it will seriously interfere with the measurement results of the internal cleanliness of the oven when opening and closing the door or when water seeps through gaps. 2. The laboratory requires a stable temperature and humidity environment. It is generally recommended to conduct the test under standard laboratory conditions, such as 23±2°C and 50±10% RH. Avoid testing in extreme or highly volatile environments. 3. The test area should be free of strong convective winds and it is best to maintain a slight positive pressure to prevent external contaminants from entering the test area. 4. The power supply voltage and frequency should be stable within the range required by the equipment. 5. The equipment should be placed on a ground or base with less vibration. There are no large stamping equipment, fans or other strong vibration sources around.   When testing a dust-free oven, controlling the external environment is as important as measuring the internal environment. An unstable, dirty or strongly interfering external environment can lead to distorted test data and fail to truly reflect the performance of the equipment. All test conditions should be clearly recorded in the final verification report to ensure the traceability and repeatability of the tests.

  العلامات الساخنة : فرن صناعي معدات الاختبار البيئي فرن الدقة Dust Free Oven Clean Oven Industrial Clean Oven

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• غرف اختبار درجة الحرارة التي يمكن الدخول إليها بدون مشاة - متطلبات التعبئة والتغليف والنقل

  Oct 08, 2025

  قبل تصميم خطة التعبئة والنقل، من الضروري أولاً فهم خصائص المعدات والمخاطر المحتملة التي قد تواجهها: أولاً، عادةً ما تكون المعدات كبيرة الحجم (عشرات الأمتار المكعبة) وقد تزن عدة أطنان. هذا يُحدد أن نقلها يندرج ضمن فئة لوجستيات البضائع الكبيرة. في الوقت نفسه، تكون طبقة العزل الرغوية لهيكل الصندوق عرضة للصدمات والقطع، كما أن رش السطح يخشى الخدوش والانخفاضات. وحدات التبريد، مثل الضواغط والمبخرات والمكثفات، تخشى الاهتزازات الشديدة والميلان. كما أن نظام التحكم الكهربائي وأجهزة الاستشعار تخشى الصدمات، وما إلى ذلك. لمعالجة هذه التحديات، يجب استخدام كتل الرغوة والقطن اللؤلؤي ومواد حشو أخرى داخل المعدات لتثبيت رفوف العينات وقنوات الهواء والأجزاء المتحركة الأخرى لمنع اهتزازها واصطدامها داخل الصندوق. يجب قفل الباب من الداخل بقفل أو شريط خاص لمنع فتحه وإغلاقه أثناء النقل. عادةً، تُوضع مواد توسيد عند فجوة الباب لمنع اصطدامه المباشر بإطاره. يُعد التغليف الرئيسي الجزء الأهم. يُنصح باستخدام هيكل حماية متعدد الطبقات، مثل طبقة مقاومة للرطوبة والغبار، وطبقة توسيد، بالإضافة إلى إطار صندوق خشبي وطبقة حماية خارجية. تتضمن خطة النقل بشكل أساسيالخيار الأول للنقل البري الداخلي هو الشاحنات المسطحة. فهي ملائمة للرفع العلوي والتحميل والتفريغ الجانبي، ومناسبة للبضائع العريضة والعالية. الخيار الثاني هو شاحنة صندوقية، توفر حماية أفضل من المطر والغبار، ولكن من الضروري التأكد من أن أبعادها الداخلية وقدرتها على التحمل كافية. لكن السر يكمن في ضرورة استخدام مركبات مزودة بوسائد هوائية أو مركبات معلقة هوائيًا لزيادة امتصاص الصدمات.٢. يُعدّ النقل البحري الأكثر شيوعًا في النقل الدولي. يجب أن تكون عبوات المعدات قادرة على تحمّل الصدمات والرطوبة ورذاذ الملح داخل الحاوية. يُنصح باستخدام خزانة فائقة الارتفاع بارتفاع ٤٠ قدمًا. عند الضرورة، ضع مواد تجفيف داخل الحاوية. الشحن الجوي مكلف للغاية، وهو مناسب فقط للمشاريع العاجلة أو ذات المهلة الزمنية القصيرة جدًا. هناك قيود صارمة على وزن وحجم العبوات.٣. يجب أن يتم التحميل والتفريغ باستخدام الرافعات أو الرافعات الشوكية. يُمنع منعًا باتًا توجيه الشوكة مباشرةً نحو جسم المعدة. عادةً ما تُحدد المواصفات الفنية للمعدة بوضوح أقصى زاوية إمالة (مثل ١٥ درجة أو ٣٠ درجة). يجب الالتزام الصارم بهذه المواصفات أثناء النقل والمناولة، وإلا فقد يؤدي ذلك إلى تلف الضاغط أو تسرب مادة التبريد. وأخيرًا، من الضروري التأكد مسبقًا من أبعاد الممر في الموقع، وقدرته على تحمل الأحمال الأرضية، وسعة المصعد مع العميل، ووضع خطة تفصيلية لتحديد المواقع. التعبئة والتغليف والنقل غرف اختبار درجة الحرارة هي في جوهرها مهمة مهنية تُعامل فيها المعدات الصناعية كـ"سلع دقيقة". أي إهمال في أي منها قد يؤدي إلى خسائر اقتصادية فادحة وتأخير في المشاريع. لذلك، يُعدّ استثمار الموارد والجهود الكافية في خطة التغليف والنقل شرطًا أساسيًا لضمان وصول المعدات بأمان وتشغيلها بسلاسة.

  العلامات الساخنة : المشي في غرفة الاختبار البيئي معدات الاختبار البيئي غرفة اختبار درجات الحرارة العالية والمنخفضة غرفة مناخية اصطناعية يمكن الدخول إليها سيرًا على الأقدام غرفة اختبار بيئية واسعة النطاق غرفة درجة الحرارة والرطوبة الثابتة

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• مبدأ موازنة درجة الحرارة داخل غرفة الاختبار بواسطة صمام الهواء

  Sep 22, 2025

  مبدأه الأساسي هو نظام تغذية راجعة سلبية مغلق الحلقة، يجمع بين "التسخين - القياس - التحكم". ببساطة، يتم التحكم بدقة في طاقة عناصر التسخين داخل الصندوق لمعادلة تبديد الحرارة الناتج عن البيئة الخارجية، وبالتالي الحفاظ على درجة حرارة اختبار ثابتة أعلى من درجة حرارة المحيط. عملية تثبيت درجة الحرارة بواسطة صمام الهواء هي حلقة مغلقة ديناميكية قابلة للتعديل باستمرار. أولاً، اضبط درجة الحرارة المستهدفة. يقيس مستشعر درجة الحرارة درجة الحرارة الفعلية داخل الصندوق آنياً، وينقل الإشارة إلى وحدة التحكم PID.عندما يحسب مُتحكم PID قيمة الخطأ، فإنه يحسب طاقة التسخين اللازمة للتعديل بناءً على قيمة الخطأ من خلال خوارزمية PID. ستأخذ الخوارزمية في الاعتبار ثلاثة عوامل:P (النسبة): ما حجم خطأ التيار؟ كلما زاد الخطأ، اتسع نطاق ضبط طاقة التسخين.التكامل (I): تراكم الأخطاء على مدى فترة زمنية محددة. يُستخدم لإزالة الأخطاء الثابتة (على سبيل المثال، إذا كان هناك انحراف طفيف دائمًا، فسيزيد حد التكامل تدريجيًا من قدرته على إزالته تمامًا).D (تفاضلي): معدل تغير خطأ التيار. إذا اقتربت درجة الحرارة بسرعة من الهدف، فسيتم تقليل طاقة التسخين مسبقًا لمنع تجاوز الحد.3. يرسل متحكم PID الإشارة المحسوبة إلى متحكم الطاقة في عنصر التسخين (مثل مرحل الحالة الصلبة SSR)، مما ينظم بدقة الجهد أو التيار المطبق على سلك التسخين، وبالتالي التحكم في توليد الحرارة.٤. تعمل مروحة الدوران باستمرار لضمان توزيع الحرارة الناتجة عن التسخين بسرعة وبشكل متساوٍ. وفي الوقت نفسه، تُرسل إشارات مستشعر درجة الحرارة إلى وحدة التحكم بسرعة، مما يُحسّن استجابة النظام. يقيس جهاز موازنة صمام الهواء حجم الهواء، بينما تتغير كثافة الهواء بتغير درجة الحرارة. عند نفس قيمة الضغط التفاضلي، يختلف معدل تدفق الكتلة أو معدل تدفق الحجم للهواء ذي الكثافات المختلفة. لذلك، يجب تثبيت درجة الحرارة عند قيمة ثابتة معروفة ليتمكن المعالج الدقيق داخل الجهاز من حساب قيمة حجم الهواء بدقة في الظروف القياسية بناءً على قيمة الضغط التفاضلي المقاسة باستخدام الصيغة المحددة مسبقًا. في حال عدم استقرار درجة الحرارة، ستكون نتائج القياس غير موثوقة.

  العلامات الساخنة : غرفة اختبار درجات الحرارة العالية والمنخفضة درجة حرارة ثابتة وغرفة الرطوبة معدات اختبار درجة الحرارة غرفة اختبار المحاكاة البيئية المكونات الأساسية لغرفة الاختبار توازن درجات الحرارة العالية والمنخفضة

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• بناء بيئة اختبار آمنة لغرفة الاختبار

  Sep 16, 2025

  مفتاح إنشاء بيئة اختبار آمنة للمختبر غرفة اختبار درجات الحرارة العالية والمنخفضة تكمن مهمتنا في ضمان السلامة الشخصية وسلامة المعدات وسلامة قطعة الاختبار ودقة البيانات.1. اعتبارات السلامة الشخصيةقبل فتح باب حجرة درجة الحرارة العالية لإخراج العينة، يُنصح بارتداء معدات الوقاية المقاومة لدرجات الحرارة العالية والمنخفضة. عند القيام بعمليات قد تُسبب تناثرًا أو تسرب غازات شديدة الحرارة أو البرودة، يُنصح بارتداء قناع وجه أو نظارات واقية.يجب تركيب غرفة الاختبار في مختبر جيد التهوية، وتجنب تشغيلها في مساحة ضيقة. قد يؤدي الاختبار في درجات حرارة عالية إلى إطلاق مواد متطايرة من قطعة الاختبار. التهوية الجيدة تمنع تراكم الغازات الضارة.تأكد من أن مواصفات سلك الطاقة مطابقة لمتطلبات الجهاز، وأن سلك التأريض موصول بشكل موثوق. والأهم من ذلك، يُمنع منعًا باتًا لمس المقابس والمفاتيح الكهربائية والعينات بأيدٍ مبللة لتجنب الصدمات الكهربائية. 2. قم بتثبيت المعدات بشكل صحيحيجب ترك مسافة أمان دنيا تحددها الشركة المصنعة (عادةً ما لا تقل عن 50-100 سم) على ظهر الجهاز وأعلى وجانبيه لضمان التشغيل السليم للمكثف والضاغط وأنظمة تبديد الحرارة الأخرى. قد يؤدي سوء التهوية إلى ارتفاع درجة حرارة الجهاز وانخفاض أدائه، بل وحتى نشوب حريق.من المستحسن توفير خط طاقة مخصص لغرفة الاختبار لتجنب مشاركة نفس الدائرة مع معدات أخرى عالية الطاقة (مثل مكيفات الهواء والأجهزة الكبيرة)، مما قد يتسبب في تقلبات الجهد أو التعثر.يُنصح بأن تتراوح درجة حرارة تشغيل الجهاز بين 5 و30 درجة مئوية. ستؤدي درجات الحرارة المرتفعة جدًا إلى زيادة الحمل على الضاغط بشكل كبير، مما يؤدي إلى انخفاض كفاءة التبريد وحدوث أعطال. يُرجى العلم بأنه لا ينبغي تركيب الجهاز تحت أشعة الشمس المباشرة، أو بالقرب من مصادر الحرارة، أو في أماكن ذات اهتزازات قوية. 3. ضمان صحة الاختبارات وإمكانية تكرارهايجب وضع العينات في منتصف حجرة العمل داخل الصندوق. يجب توفير مساحة كافية بين العينات، وبينها وبين جدار الصندوق (يُنصح عادةً بأن تزيد عن 50 مم)، لضمان دوران هواء سلس داخل الصندوق ودرجة حرارة ثابتة وموحدة.بعد إجراء اختبارات درجات الحرارة العالية والرطوبة العالية (مثل غرفة درجة الحرارة والرطوبة الثابتة)، إذا كانت هناك حاجة إلى اختبارات درجات الحرارة المنخفضة، فيجب إجراء عمليات إزالة الرطوبة لمنع تكوين الجليد المفرط داخل الغرفة، مما قد يؤثر على أداء المعدات.يُمنع منعًا باتًا اختبار المواد القابلة للاشتعال والانفجار والتآكل الشديد والتطاير، باستثناء غرف الاختبار المقاومة للانفجار والمُصممة خصيصًا لهذا الغرض. كما يُمنع منعًا باتًا وضع المواد الخطرة، مثل الكحول والبنزين، في غرف الاختبار العادية ذات درجات الحرارة العالية والمنخفضة. 4. مواصفات التشغيل الآمن وإجراءات الطوارئقبل التشغيل، تأكد من إحكام إغلاق باب الصندوق، ووظيفة قفله سليمة. تأكد من نظافة الصندوق وخلوه من أي أجسام غريبة. تأكد من صحة منحنى درجة الحرارة المضبوط (البرنامج).أثناء فترة الاختبار، من الضروري التحقق بانتظام مما إذا كانت حالة تشغيل المعدات طبيعية وما إذا كان هناك أي ضوضاء أو إنذارات غير طبيعية.قواعد التعامل مع العينات ووضعها: ارتدِ قفازات مقاومة للحرارة العالية والمنخفضة بشكل صحيح. بعد فتح الباب، أدر جسمك قليلاً إلى الجانب لتجنب وصول موجة الحر إلى وجهك. أخرج العينة بسرعة وحذر وضعها في مكان آمن.الاستجابة للطوارئ: تعرّف على موقع زر إيقاف الطوارئ الخاص بالجهاز أو كيفية فصل التيار الكهربائي الرئيسي بسرعة في حالات الطوارئ. يُنصح بتوفير طفايات حريق ثاني أكسيد الكربون (المناسبة للحرائق الكهربائية) في مكان قريب بدلاً من طفايات الحريق المائية أو الرغوية.

  العلامات الساخنة : غرفة اختبار درجة الحرارة والرطوبة الثابتة غرفة اختبار درجات الحرارة العالية والمنخفضة صندوق دورة درجة الحرارة بيئة اختبار غرفة الاختبار فرن الدقة احتياطات السلامة لغرف الاختبار

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