Sealing Problems and Solutions of High and Low Temperature Test Chamber

High and low temperature test chamber is based on the natural environment such as high temperature, ultra-low temperature, high and low temperature and low temperature drying in the room during the construction of work, and then carries out high and low temperature test and temperature and humidity aging resistance experiment on the commodity, mainly used for industrial products, such as: electronic and electrical, instrumentation equipment, cars and motorcycles, universities and other manufacturing industries.

Because of high temperature testing, ultra-low temperature testing, high and low temperature test cycle system testing, high and low temperature test and other experimental standards, high and low temperature test chamber in the high temperature standards, such as doing 150 ° C extremity of high temperature and 98% of the ambient humidity conditions, and the pressure difference between inside and outside the laboratory to expand substantially, at this moment, the sealing effect of the test chamber really matters. If the airtightness is not very good, it will cause more serious vapor leakage, affecting the precision and accuracy of the temperature.

What are the factors that cause the sealing problem of the high and low temperature test chamber?

First, the constant temperature and humidity test chamber usually has cable holes and ventilation exhaust holes, and the design scheme is very strict.

If the design scheme and production are not scientific, the gap will be too large, and the sealing of the environmental test chamber will not be good. This punching studio should also remember to plug the suitable specifications of the bottle stopper, rubber stopper, etc., to ensure that the sealing of this punching place is intact.

Second, the problem of sealing rubber strips of high and low temperature test chamber. We usually ignore this problem, feel that the sealing strip is added to the door hinge, and should be very sealable under the inhibition of the door hinge, because the aging of the silicone seal, the selection of hard flexibility is unscientific, and the sealing strip is fixed and not the same, often causing steam leakage. It is also simple to handle, often test its tightness, and find that the embrittlement of the sealing strip must be replaced as soon as possible.

Third, because the general volume of the high and low temperature test chamber is relatively large, the tail door specifications are expanded, and the net weight is very large, and the vertical orientation of the door hinge is offset after the long-term load, and the tail door is shifted and closed. Such problems are usually dealt with according to the modified high-load door hinges and the total number of door hinges.

From the above analysis, it can be seen that the sealing problem of the high and low temperature test chamber has some design problems and some maintenance problems. Therefore, we should strictly follow the equipment maintenance manual for regular maintenance in the use of equipment to ensure the normal operation of equipment and no deviation of technical parameters.

Selection Method of Drying Oven Fan

Drying oven fan selection is a very technical work, and there are many specific selection methods, such as: according to the dimensionless characteristic curve selection, according to the logarithmic coordinate curve selection, according to the dimensional characteristic curve or performance table selection, variant selection, according to the pipe network resistance selection, etc. At present, there is also a Web selection system and the use of special selection software to select. Methods are numerous and complex, and some methods require certain professional knowledge to master.

When choosing a fan, first according to the two basic parameters of the air volume and total pressure of the fan, the model and number of the fan can be determined through the dimensional performance table of the fan (each fan product manual has relevant data), and more than one product may meet the requirements; At this time, combined with the use of the fan, process requirements, use occasions, etc., select the type, model and structural material of the fan to meet the required working conditions, and strive to make the rated flow rate and rated pressure of the fan as close as possible to the flow and pressure required by the process, so that the operating condition point of the fan is close to the efficient area of the fan characteristics.

The specific principles of the drying oven are as follows:

1, Before choosing the fan, we should understand the production and product quality of the domestic ventilation phase, such as the production of fan varieties, specifications and special uses of various products, the development and promotion of new products, etc., should also fully consider the requirements in order to choose the best fan.

2, According to the different physical and chemical properties of the gas transported by the fan, choose different uses of the fan. Explosion-proof ventilator should be selected if there are explosive and flammable gases; Dust or pulverized coal should be selected to exhaust dust or pulverized coal fan; Conveying corrosive gases should choose anti-corrosion fan; Working in high temperature occasions or conveying high temperature gas should choose high temperature fan.

3, When there are more than two kinds of fans to choose from on the fan selection performance chart, the higher efficiency and smaller machine number should be preferred; One with a larger range of adjustment, of course, should also be compared and decided by weighing the advantages and disadvantages.

4, If the selected fan impeller diameter is much larger than the original fan impeller diameter, in order to use the original motor shaft, bearing and support, it is necessary to calculate the motor starting time, the strength of the original fan components and the critical speed of the shaft.

5, Choose the centrifugal fan, when the motor power is less than or equal to 75KW, can not be installed only for the start of the valve. When high temperature flue gas or air is discharged and the centrifugal boiler induced draft fan is selected, a starting valve should be set up to prevent overload during cold operation.

6, For the ventilation system with noise reduction requirements, the ventilator with high efficiency and low impeller circular speed should be selected first, and the ventilator should work at the high efficiency point; According to the transmission mode of noise and vibration generated by the ventilation system, corresponding measures should be taken to reduce sound and vibration. Vibration reduction measures for fans and motors can generally use vibration reduction bases, such as spring shock absorbers or rubber shock absorbers.

7, In the selection of fans, should try to avoid the use of fans in parallel or series work. When unavoidable, the ventilator of the same model and performance should be selected for joint work. When the series is used, there should be a certain pipeline connection between the stage ventilator and the second stage ventilator.

8, The selected new fan should consider making full use of the original equipment, suitable for on-site production and installation and safe operation.

Technical Characteristics of Refrigeration and Temperature Control System of High and Low Temperature Test Chamber

High and low temperature test chamber is a kind of test equipment widely used in various industries, which is widely used to simulate various environmental conditions and test the durability, reliability and corrosion resistance of products. The technical characteristics of the high and low temperature test chamber are mainly reflected in its refrigeration system and temperature control system.

First of all, the refrigeration system of the high and low temperature test chamber has a high refrigeration capacity and refrigeration speed. During the temperature control process, a refrigeration system is needed to quickly reduce the temperature inside the test chamber. At present, the mainstream refrigeration system mainly has two kinds of compression refrigeration system and refrigerant loop circulation system. Among them, the compression refrigeration system has a high refrigeration capacity and refrigeration speed, which can quickly reduce the temperature inside the test chamber to the set temperature, but also to ensure the stability of the temperature.

Secondly, the temperature control system of the high and low temperature test chamber has high accuracy and stability. The temperature control system is the core part of the whole test chamber, which realizes the accurate control and stability maintenance of the internal temperature of the test chamber through the adjustment and control of the refrigeration system and the heating system. The current mainstream temperature control system mainly includes PID control system and intelligent control system. Among them, the PID control system has the characteristics of high precision and high stability, which can realize the accurate control of the temperature inside the test chamber, and is suitable for the test environment with high requirements for temperature control accuracy. The intelligent control system has the characteristics of more intelligent, and can realize the automatic control and adjustment of the internal temperature of the test chamber through self-learning algorithm and big data analysis technology, which is suitable for the occasions with relatively broad test environment requirements.

In summary, the technical characteristics of the high and low temperature test chamber are mainly reflected in its refrigeration system and temperature control system. The compression refrigeration system and PID control system have the characteristics of high cooling capacity, high cooling speed, high temperature control accuracy and high stability, which are suitable for the test environment requiring high temperature control accuracy and stability. In the future, with the development of artificial intelligence and Internet of Things technology, the control system of high and low temperature test chamber will continue to develop and improve in the direction of intelligence, automation and remote control, so as to better meet market demand.

Technical Means of Precise Temperature Control in High and Low Temperature Test Chamber

The high and low temperature test chamber is used to test the adaptability of materials or products in high and low temperature environments, and its accurate temperature control is achieved in the following ways:

1, Temperature control system

High and low temperature test chamber usually adopts temperature control system to achieve accurate temperature control. The system consists of temperature sensors, controllers and heaters. The temperature sensor is placed inside the test chamber to monitor the temperature change in real time, and the controller automatically controls the output power of the heater according to the signal of the sensor to achieve the purpose of accurate temperature control.

2, Temperature fluctuation control

Temperature fluctuation is an important index of accurate temperature control in high and low temperature test chamber. In order to ensure the stability of the temperature inside the test chamber, the controller will reduce the temperature fluctuation by adjusting the output power of the heater. Under normal circumstances, the accuracy of temperature fluctuations is required to be within 0.2°C.

3, Sealing control

The tightness of the high and low temperature test chamber is one of the important factors to ensure accurate temperature control. The tightness of the test chamber needs to be ensured by strict airtight testing to ensure that the heat inside the test chamber does not leak to the outside, or the heat from the outside does not enter the inside.

4, Time control

The time control of high and low temperature test chamber is also an important means to ensure accurate temperature control. The controller can set the test time according to the test needs, and automatically stop the test after the test time arrives to ensure the safety of the test sample.

In summary, the accurate temperature control of the high and low temperature test chamber is achieved through the joint action of many factors such as temperature control system, temperature fluctuation control, sealing control and time control.

Use Principle of High and Low Temperature Test Chamber Low Temperature and Constant Temperature Tank 

Because of its own circulation system, the uniformity of temperature field is very high, and more and more experiments are applied to the low temperature constant temperature tank. Mainly used in petroleum, chemical, electronic instrumentation, physics, chemistry, biological engineering, medicine and health, life science, light industrial food, physical property testing and chemical analysis and other research departments, colleges and universities, enterprise quality inspection and production departments, to provide users with a hot and cold controlled, uniform and constant temperature field source for test samples or products to perform constant temperature test or test. It can also be used as a heat source or cold source for direct heating or cooling and auxiliary heating or cooling.

What are the precautions for using a low temperature or constant temperature tank?

1, Before the use of low temperature constant temperature tank, the tank should be added to the liquid medium (pure water, alcohol, methyl silicone oil), the medium liquid level should be less than 20mm workbench, otherwise the power will damage the heater.

2, The selection of liquid medium in the low temperature constant temperature tank should comply with the following principles:

When the operating temperature is below 5 ° C, the liquid medium is generally alcohol;

When the operating temperature is 5 ~ 85℃, the liquid medium is generally water;

When the working temperature is 85 ~ 95℃, the liquid medium can choose 15% glycerol aqueous solution, which can reduce the evaporation of water;

When the operating temperature is higher than 95 ° C, oil is generally selected as the liquid medium, and the open cup flash point value of the selected oil should be higher than the operating temperature of 50 ° C or more; Generally, methyl silicone oil with low viscosity is used.

3, Power supply: 220V50Hz, the power supply should be greater than the total power of the instrument, the power supply must have a good "grounding" device.

4, The instrument should be placed in a dry and ventilated place, and there are no obstacles within 300mm around the instrument.

5, When the thermostat working temperature is high, should be careful not to open the cover, hands do not enter the groove, to prevent hot injury.

6, After using, all switches are placed in the off state, cut off the power.

7, Avoid acid and alkali substances into the tank corrosion coil and inner liner.

8, The instrument should do a good job of regular cleaning work, long-term use, empty the media in the tank, and wipe clean, keep the workbench and the operating panel clean.

9, Often pay attention to observe the liquid level in the tank, when the liquid level is too low, the liquid medium should be added in time.

10, Liquid external circulation, customers should pay special attention to the fastness of the connection of the leading pipe, strictly prevent falling off, so as to avoid liquid leakage.

What are the Types of PCB Environmental Tests?

High acceleration test:

Accelerated tests include high accelerated life test (HALT) and High accelerated Stress screening (HASS). These tests assess the reliability of products in controlled environments, including high temperature, high humidity, and vibration/shock tests when the equipment is powered on. The goal is to simulate the conditions that could lead to the imminent failure of a new product. During testing, the product is monitored in a simulated environment. Environmental testing of electronic products usually involves testing in a small environmental chamber.

Humidity and corrosion:

Many PCBS will be deployed in wet environments, so a common test for PCB reliability is a water absorption test. In this type of test, the PCB is weighed before and after being placed in a humidity controlled environmental chamber. Any water adsorbent on the board will increase the weight of the board, and any significant change in weight will result in disqualification.

When performing these tests during operation, exposed conductors should not be corroded in a humid environment. Copper oxidizes easily when it reaches a certain potential, which is why exposed copper is often plated with an antioxidant alloy. Some examples include ENIG, ENIPIG, HASL, nickel gold, and nickel.

Thermal shock and circulation:

Heat testing is usually performed separately from humidity testing. These tests include repeatedly changing the board temperature and checking how thermal expansion/contraction affects reliability. In thermal shock testing, the circuit board uses a two-chamber system to quickly move between two temperature extremes. The low temperature is usually below the freezing point, and the high temperature is usually higher than the glass transition temperature of the substrate (above ~130 ° C). The thermal cycle is carried out using a single chamber, with the temperature changing from one extreme to the other at a rate of 10°C per minute.

In both tests, the board expands or contracts as the board temperature changes. During the expansion process, conductors and solder joints are subjected to high stress, which speeds up the service life of the product and enables the identification of mechanical failure points.

The Importance of Office Chair Casters

Office chair casters are essential for enhancing mobility and convenience in the workplace. They allow chairs to glide smoothly across various surfaces, reducing effort and improving accessibility. Available in diverse designs, casters can accommodate different flooring types, weight capacities, and chair models. Selecting the right casters not only prevents floor damage but also enhances ergonomics and extends the lifespan of your chair.

Popular Types of Office Chair Casters

Small Casters

Small casters with adhesive backing are a versatile option for situations where traditional mounting methods like screws or bolts are impractical. They are perfect for lightweight applications, such as portable furniture or small organizers.

Swivel Casters with Brakes

These casters feature a locking mechanism that ensures stability when needed, making them ideal for tasks requiring the chair to remain stationary or when used on uneven surfaces.

Transparent Furniture Casters

Combining style and functionality, transparent casters add a modern touch to any workspace. Made from durable materials, they are compatible with a variety of chair models and protect floors while maintaining aesthetic appeal.

Key Factors to Consider When Choosing Casters

Wheel Size: Proper sizing ensures compatibility with your chair and enhances performance. For example, Ylcaster's half-transparent office chair casters are designed in a versatile size, suitable for both home and school chairs.

Material: Durable materials are critical to reducing wear and tear. While many casters wear out quickly, Ylcaster casters are built to last, requiring less frequent replacements. This not only saves money but also ensures consistent performance.

Selecting the right office chair casters is essential for comfort, efficiency, and style. Ylcaster offers reliable and durable options that meet diverse needs, ensuring your chairs remain functional and stylish for years. Make the smart choice with Ylcaster today!

With the rise of lightweight and durable materials in construction, aluminum movable scaffolding casters are gaining popularity as a premium choice. These casters combine strength with a lighter build, making scaffolding setups safer, more efficient, and easier to maneuver. Here, we list two popular types of aluminum casters, detailing their features and advantages to illustrate why aluminum is revolutionizing the scaffolding caster market.

1. Heavy-Duty Aluminum Swivel Caster with Brake

This Caster with Brake offers a seamless blend of mobility and stability. Crafted with a robust aluminum frame, this caster can support significant weight while remaining lightweight for easy handling. Its premium swivel design ensures smooth 360-degree turns, allowing users to reposition scaffolding with ease. This caster also comes with a quick-lock brake system, providing secure stability when you need it most.

Key Benefits:

Lightweight Construction: Reduces overall scaffold weight, making setups faster and safer.

Precision Swivel Mechanism: Provides smooth, reliable movement on a variety of surfaces.

Quick-Lock Brake: Offers maximum stability on demand, ensuring worker safety.

2. Shock-Absorbing Aluminum Scaffolding Caster

This Caster is designed for rugged environments where impact resistance and durability are crucial. Its specialized shock-absorbing feature protects against vibrations and jolts, reducing wear and tear on both the caster and scaffold. With an anti-corrosion aluminum body, this caster is built to withstand harsh outdoor conditions without compromising performance.

Key Benefits:

Shock Absorption: Minimizes impact, preserving caster and scaffold longevity.

Rust-Resistant Aluminum Body: Extends caster life, even in challenging weather conditions.

Enhanced Load Capacity: Balances strength and weight, supporting a wide range of scaffolding requirements.

Advantages of Aluminum Movable Scaffolding Casters

Aluminum casters bring several standout benefits to scaffolding. Lightweight yet durable, they make scaffolding easier to transport and assemble without sacrificing load capacity. Their anti-corrosion properties make them ideal for outdoor use, maintaining their quality in varying weather conditions.

When selecting cast iron casters for industrial or heavy-duty use, understanding braking systems is crucial for optimal performance and safety. Two common options are the dual brake and the side brake. Here’s how to easily differentiate between them and decide which is best for your needs.

1. Dual Brake: Full Control

A dual brake system locks both the swivel and the wheel of a swivel caster with brake, providing maximum stability. This type is ideal for situations where movement in any direction must be entirely restricted, ensuring safety on slopes or during loading. Look for this feature if you require a caster that completely immobilizes equipment.

2. Side Brake: Simpler and Efficient

In contrast, a side brake only locks the wheel, allowing the swivel mechanism to remain functional. This option is perfect for applications requiring partial movement control, such as repositioning equipment without removing the brake entirely. A side brake is a more straightforward solution often found in lightweight to moderate-duty setups.

Choosing the Right Brake for Your Cast Iron Casters

Understanding the intended use of your cast iron casters will help you decide between these two braking mechanisms. For heavy machinery or uneven terrain, the dual brake is a reliable choice. For more flexible or lighter applications, the side brake might be sufficient.

By considering your specific requirements, you can confidently select the ideal swivel caster with brake for your project, ensuring both efficiency and safety.

Spring loaded casters as one of the popular industrial castor, are an innovative solution designed to improve the functionality of various equipment and carts by providing enhanced mobility and stability. These specialized casters feature built-in spring mechanisms that allow for vertical movement, effectively absorbing shock and reducing the impact of uneven surfaces. This makes them ideal for applications in warehouses, hospitals, and manufacturing environments.

Types of Spring Loaded Casters:

Locking Spring Loaded Casters

Advantages: Combining the benefits of shock absorption with a locking feature, these casters can be securely locked in place. This is particularly useful in environments where stability is critical, such as in medical settings where equipment must remain stationary during use.

Heavy-Duty Spring Loaded Casters

Advantages: Designed for industrial applications, these heavy duty caster wheels can support substantial loads while maintaining shock absorption capabilities. They are ideal for heavy equipment or machinery that operates on uneven surfaces, ensuring safe and efficient mobility.

Spring loaded casters are essential for improving the performance and safety of equipment in various settings. By absorbing shocks and providing enhanced stability, they reduce the risk of damage and increase efficiency, making them a smart choice for anyone looking to optimize their mobility solutions.