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Condensation in high and low temperature test
In the high and low temperature test, the phenomenon of product condensation sometimes occurs, mainly because the ambient temperature of the high and low temperature test box increases during the high and low temperature test, and the surface temperature of the thermal inertia product is lower than the temperature of the test environment, thus forming hot and humid ambient air The surface of the product below the dew point causes water vapor to condense into dew drops on the surface of the product.
In addition, if the product is in a sealed state, when the high and low temperature test chamber is cooled, the temperature of the inner wall of the product shell cools faster than the temperature in the cavity, and the hot and humid air in the cavity will also condense into dew drops on the inner wall of the product shell. And because most products are not completely sealed, condensation usually occurs during the heating phase.
Condensation is related to the material used in the product, the size of the cavity, the rate of temperature rise and fall, and the relative humidity. The poorer the material absorbs heat, the larger the cavity, the faster the temperature rises and falls, and the greater the relative humidity, the stronger the condensation effect. Any condition that destroys the conditions for condensation to occur can prevent condensation from occurring.
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Ozone resistance testing machine function
The ozone resistance tester is used to test the resistance to cracking of rubber products such as vulcanized rubber, thermoplastic rubber, and cable insulation sheaths in an ozone environment. The ozone resistance testing machine can control and adjust the concentration of ozone environment to determine the ozone resistance of the test piece.
The content of ozone in the atmosphere is very small but it is the main factor of rubber cracking. The ozone resistance testing machine simulates and strengthens the ozone conditions in the atmosphere, and quickly identifies and evaluates the rubber anti-ozone aging performance and anti-ozone agent protection efficiency methods, and then adopts Effective anti-aging measures to improve the service life of rubber products.
According to the test methods and standards, it can be divided into "static" and "dynamic". Static means that the sample is stretched and placed in the test box for testing, while dynamic means that the sample is placed on the fixture of the test box and stretched while doing the test. In the test, the tensile fluctuation is about 5%-45% of the tested sample itself.
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ging detection
Aging detection is a process of simulating various factors involved in the actual use conditions of the product to carry out corresponding conditions and strengthening experiments. This experiment is mainly for plastic materials. Common aging mainly includes light aging, damp heat aging, and hot air aging. . The product is used outdoors for a long time under the sun. If you want to know the life of the product can be used outdoors, it is necessary to simulate the sun's ultraviolet light to perform a UV aging experiment. Of course, the intensity of the experiment is much greater than the actual outdoor light intensity, thus shortening the test time , You can understand the aging status of the product after how many years of use through a short-term test.
Aging detection test range
Plastic/rubber products (including PP, PVC, natural rubber, etc.), especially product plastic shells, plastic fasteners, etc.
Coating/adhesive products (industrial coatings, architectural coatings), especially coatings for outdoor use.
Outdoor decorations (including outdoor light boxes, outdoor electroplating parts, etc.). More test ranges should be determined according to specific test requirements.
The breakdown of products that can be tested by aging test is as follows:
The aging test of plastic products includes: plastic particles, plastic wires, plastic ropes, plastic belts, hoses, rigid pipes, corrugated pipes, plastic sheets, plastic films, plastic switches, plastic doors and windows, plastic rods, artificial leather, cables, foam materials, plastics Profiles, car accessories, etc.
Chemical test items for footwear and leather products
my country is the world’s largest textile producer and exporter. As people’s living standards continue to improve, consumers’ quality requirements for textile, apparel, shoes and leather products have evolved from a single product comfort, functionality, and safety to a whole Every stage of the industrial chain, from raw materials to finished products, must protect public health and safety.
Footwear and leather products use a lot of chemical materials in the manufacturing process, and these materials are often the source of harmful substances. In order to avoid the potential hazards of footwear and leather products to human health, it is an inevitable requirement to limit the content of harmful substances such as formaldehyde, azo dyes, extractable heavy metals, and phthalates.
In addition, in recent years, my country's footwear and leather products have been recalled due to excessive harmful substances. Only by testing these products for harmful substances can we avoid trade risks to the greatest extent.
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Dry screw vacuum pump
The screw vacuum pump has a recovery system, which is fully in line with the concept of energy conservation and environmental protection, and is more widely used. But why is the market share of dry-type screw vacuum pump not high? In addition to the price plateau, there are also users who do not have a good understanding of the dry vacuum pump and can not see the future economic benefits brought to the enterprise. This paper focuses on how to optimize the selection of dry vacuum pump?
For these different types of dry vacuum pump, we are eager to be able to reduce its physical size. But this is in contradiction with the pumping rate of the vacuum pump, because the pumping rate of the vacuum pump is directly proportional to the volume of the vacuum pump. Small physical size means small volume. Of course, there is also an important factor that affects the pumping rate of vacuum pump, that is, the rotational speed. In order to match the pumping rate of small size vacuum pump with that of large size vacuum pump, it is necessary to increase its speed.
There are two ways to change the speed of vacuum pump, one is to change the frequency of power supply, that is to use frequency converter; the other is to change the transmission ratio of gearbox. The advantage of frequency converter is that it can provide a closed-loop control, but it is easy to cause torque loss under heavy load. Changing the gear ratio of the gearbox is a very economical method. Of course, it can only provide a single speed which is not controllable.
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Waste heat recovery of air compressor
Air compressor in the process of work produces very large heat energy, but let it white out to the air is a very pity, so there is what we call air compressor waste heat recovery. The waste heat recovery of air compressor is to transfer the heat of high temperature oil of air compressor to cold water through superheat exchange technology. The cold water is heated and flows into the heat preservation water tank, so as to achieve the purpose of heat recovery.
Because 73% of the heat energy of the air compressor is in the oil, and the technical treatment and heat exchange of the oil will produce a continuous stream of hot water, that is, the air compressor can work under constant temperature, and can meet the needs of the factory or life of hot water, kill two birds with one stone, and the hot water generated by the waste heat recovery technology of air compressor does not need any additional cost, which reduces the cost Less investment by factories to make hot water. Air compressor waste heat recovery is a very environmental protection and energy saving way.
Frequency conversion series air compressor chemical industry
Chemical industry in the production process often uses and produces corrosive gases, liquids and dust, a large number of flammable and explosive dangerous substances, as well as irritant, polluting and other toxic substances, so chemical plants are mostly built on water. In the design of building structure and production equipment will be considered in all aspects of anti-corrosion, fire, explosion-proof measures. With the rapid development of science and technology, modern chemical plants mostly use energy-saving, intelligent regulation and centralized control of chemical equipment.
Clean and stable compressed air is indispensable in the complex production process of chemical plant. The compressed air from the air compressor is compressed and discharged into clean and stable gas after passing through a set of precise post-treatment system of gas storage tank, dryer and filter, and then divided into two pipelines: one is used to drive some pneumatic equipment, the other is used to produce nitrogen and chemical raw materials. Therefore, a high quality air compressor and post-treatment system will be directly related to the production process of the whole chemical plant.
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There are basically three types of screw pumps commonly used in the industry. They are divided according to the number of screws, namely, single screw pump, double screw pump and three screw pump. Then, let's see their characteristics and differences:
Single screw pump structure: the single head male screw rotor rotates eccentrically in the special double head female screw stator (the stator is soft), which can swing back and forth along the pump center line, and always keeps mesh with the stator.
Features of single screw pump:
1. It can transport liquid containing solid particles;
2. It can be used for almost any viscosity fluid, especially for high viscosity and non-Newtonian fluid;
3. The operating temperature is limited by the stator material.
Performance parameters: the flow rate can reach 150m3 / h, and the pressure can reach 20MPa.
Application of single screw pump: for molasses, pulp, starch paste, chocolate paste, paint, tar, paraffin, grease, mud, clay, clay, etc
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The magnetic pump is made of stainless steel with reasonable design and advanced technology. It has the characteristics of full sealing, no leakage and corrosion resistance. Static seal is used instead of dynamic seal in stainless steel magnetic pump, which makes the overflow parts of the pump in a completely sealed state.
The magnetic pump is made of corrosion-resistant and high-strength engineering plastics, jadeite ceramics and stainless steel. Therefore, it has good corrosion resistance and can prevent the transported medium from pollution.
The main materials and uses of magnetic pump the magnetic pump has compact structure, beautiful appearance, small volume, low noise, reliable operation, convenient use and maintenance. It can be widely used in chemical, pharmaceutical, petroleum, electroplating, food, national defense, scientific research institutions, metallurgy, dye and other units to pump acid, alkali, oil rare and precious liquid, venom, volatile liquid, as well as circulating water equipment supporting, filter supporting.
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Application and development of water ring vacuum pump
In the development of the value strength of water ring vacuum pump, the promotion of its practical application and quality capability, and the promotion of its overall application and quality capability, the enhancement of its overall application capability is reflected, so as to expand its practical application capability. In terms of practical performance, the promotion of its overall advantage function is enhanced, and the belt of product performance is utilized Dynamic, with reliable practical advantages to enhance the strength of its products, so as to speed up its practical application effect.
It is necessary to accelerate the overall strength of application performance development of water ring vacuum pump, promote the embodiment of practical value such as product application, strengthen the promotion of product application and performance practical effect. In order to reflect the practical effect of product performance of water ring vacuum pump, the vacuum pump should be driven by the overall driven quality strength to expand the embodiment of product performance, so that it can be based on the performance of all aspects of strength To enhance the quality and effect of products and expand the overall development of all aspects of application strength.
The application basis of the product is reflected in the utilization effect of all aspects, so that it can expand the exertion of its product strength and further expand the improvement of its application performance in the reliable overall application level, so as to expand the embodiment of its application strength in all aspects, enhance the overall improvement of the product performance strength and expand the exertion of its quality performance.
08.11.2021 04:37
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