In industrial and agricultural production and research, many raw materials and products exist in the form of powder, and powder plays a pivotal role in production. The particle size distribution of the powder can affect the quality and performance of the product. Therefore, in the powder industry, it is important to effectively control and measure the particle size distribution of the powder, which is important for improving product quality, reducing energy consumption, controlling environmental pollution, and protecting human health. significance.
The particle size test instrument is an instrument for testing the size and distribution of solid particles by physical methods, and is widely used in the fields of construction, paint, petroleum, medicine, environmental protection, food, and the like. The particle size analyzer is divided into a sedimentation particle size analyzer, a sedimentation balance, a laser particle size analyzer, an optical particle counter, a resistive particle counter, a particle image analyzer, and the like according to different test principles. Among them, the laser particle size analyzer is a new type of particle size measuring instrument with laser as the detection light source. It has been processed, applied and researched in powder because of its fast test speed, wide test range, good repeatability and authenticity, and easy operation. The field is widely used.
The nano-scale particle testing technology designed according to the principle of dynamic light scattering is a new technology and has been rapidly developed in recent years. Dynamic Light Scattering (DLS), sometimes referred to as photon correlation spectroscopy (PCS) or quasi-elastic light scattering (QELS), is primarily used to measure the particle size distribution of nanomaterials. The dynamic light scatterometer's measurement range is mainly in the sub-micron and nano-scale. It is a non-invasive technology that has been well-known for measuring the particle size of submicron-sized molecules and particles. It can detect less than 1 nm using the latest technology. Particle size.
1 Overview of the development of the international laser particle size analyzer industry represented by Malvern
The production of laser particle size meters on the international market is very active. The products of Malvern, Beckman Coulter, Brookhaven and other companies occupy the main market. Among them, Malvern has extended the measurement range of dynamic light scattering to the sub-nano range. .
Malvern is the earliest advocate of laser diffraction technology. Now laser diffraction technology is not only the basis of the Mastersizer particle size analyzer used in the laboratory, it is also the core function of the professional-grade Spraytec spray particle size measurement system and the Insitec series online particle size analyzer.
Malvern dynamic light scattering technology is the world leader. Its products have the following advantages: the measurement is carried out in the original environment of the material; the average particle size is only required to know the viscosity and refractive index of the solution; the sample preparation is simple or no preparation is required. A turbid sample having a high concentration is measured; a particle diameter of <1 nm can be measured; and a particle size of a molecule having a molecular weight of <1000 Da can be measured.
This year, Malvern Instruments has introduced a new generation of Zetasizer series nano-particle size through comprehensive technological innovation and system optimization. The product uses breakthrough innovations in optical transmission systems, signal processing technology and software design. It combines a new generation of PALS M3, NIBS backscatter and folded capillary sample cell design to make it sensitive and stable. The range of properties and detection has been revolutionized, with a maximum particle size range of 0.3 nm to 10 μm, and various important measurement indicators have reached an unparalleled height. It is widely used in many fields such as nanomaterials and life sciences and medicines, and is the most effective analytical system indispensable for scientific research and quality control.
Why has Malvern been leading the particle sizer market for decades? Malvern believes that this has a lot to do with listening to the needs of customers and the development of the company. In addition, Malvern’s accurate grasp of market demand, serious attitude towards customers and strong support have made Malvern’s market today. status.
2 Development status of laser particle size analyzer in China
2.1 China's laser particle size analyzer is developing rapidly
The research work of particle size testing technology in China started in the 1970s, and the development of laser particle size analyzer began in the 1980s. Before the mid-1990s, the domestic particle size testing instruments were mainly based on sedimentation particle size analyzers. The commercial laser particle size analyzers have not been put on the market. The domestic laser particle size analyzers all rely on imports. In recent years, China's particle size analyzer industry has developed rapidly, and domestically produced particle size analyzer products with independent intellectual property rights and excellent performance are constantly coming out. Tianjin University, Jinan University, Shanghai Polytechnic University, Dandong Instrument Institute and other units have done a lot of work, and have made significant breakthroughs in the past ten years, such as the double-spectrum structure of Tianjin University and the two optics of Dandong Baxter. Structure, sample pool of Jinan Weiner, refractive index measurement of South China Normal University, fully automatic system of Zhuhai Omega.
Citing the general manager of Dandong Baite Instrument Co., Ltd. Dong Qingyun: "At present, China's laser particle size testing technology is at a mature stage. Products with independent intellectual property rights and excellent performance are constantly coming out, and the main performance is represented by accuracy and repeatability. The indicators have reached the advanced level of similar foreign products."
Domestic particle size analyzer technology research follows the pace of world development. When domestic laser particle size analyzers found that the effective lower limit of the "Static Light Scattering Theory" test can only reach 50 nanometers, when the smaller particles are unable to do anything, the "dynamic light scattering" technology is introduced for nanoparticle testing. With the continuous development of laser particle size analyzer technology in China, the number of units developing dynamic light scattering technology in China is increasing. Many universities such as Shanghai University of Technology, Zhejiang University, Peking University, Tsinghua University, and Jinan University have invested in this research. .
At present, the laser particle size analyzers of Zhuhai Omega Instrument Co., Ltd., Dandong Baite Instrument Co., Ltd. and Jinan Micro-Nano Particle Technology Co., Ltd. have all been unanimously recognized in the market. Among them, Dandong Baxter, Jinan Weiner and The dynamic light scattering laser particle size analyzer of Zhuhai Omega has also been put on the market.
2.2 Domestic laser particle size analyzer excellent product example
2.2.1 Laser particle size analyzers of many domestic enterprises reach nano level
China has made outstanding achievements in the production of light-related particle size analyzers. For example: Chengdu Jingxin JL-1197 nano-laser particle size analyzer refers to ISO13320, ISO13321 international standard, photon correlation spectroscopy principle, full-scale Mie scattering test. It can be tested in two ways at the same time. Make full use of the best measurement range of the two principles to achieve measurement accuracy. The test range is from 1 nm to 1000 nm by photon correlation spectroscopy. In 2010, Zhuhai Omega launched the Easizer30 laser particle size analyzer on the basis of the Easy Race 20, which is fully automated and extremely convenient to operate, avoiding the deviation of results caused by human factors.
2.2.2 Jinan Weiner launched dynamic light scattering nanometer particle size analyzer in 2009
As a leader in China's particle testing technology, Micro-Nano has invested a lot of manpower and material resources since 2006, and has developed a key component of dynamic nanotechnology – the development of correlators. In October 2008, it finally successfully launched CR-128 digital. The correlator has a delay channel of 128 channels and a minimum resolution time of only 8 nanoseconds. Breaking the monopoly of foreign manufacturers and opening the door to nanoparticle testing technology.
In 2009, Jinan Micro-Nan introduced the nano-particle sizer Winner801 based on the principle of dynamic light scattering. The instrument is also the first nano-particle analyzer in China that uses photon correlation spectroscopy (PCS) technology. It adopts the high-speed digital correlator independently developed by the company and the imported high-performance photomultiplier tube as the core device. It has the characteristics of fast, high resolution, repeatability and accuracy, and is the first choice for particle size determination of nanoparticles. The test range is from 1 to 3500 nm. Recently, Jinan Micro-Nan has optimized and upgraded on the basis of the original products, and launched Winner803, which is currently in the trial production stage and is expected to be put on the market soon.
2.2.3 Dandong Baxter laser particle size analyzer has been recognized by the international market
Through independent innovation and cooperation in production, education and research, Dandong Baxter has successfully developed laser particle size series instruments with advanced levels at home and abroad. In 2009, Dandong Baxter and South China Normal University cooperated in the dynamic light scattering nano-laser particle size analyzer project, which was created in the same year, successfully developed in the same year, and put into production that year.
BT-90 Dynamic Light Scattering Nano Laser Particle Size Analyzer is the research result of Dandong Baxter's research results from South China Normal University and the implementation of industrialization project with South China Normal University. The particle size analyzer has a particle size range of 1 nm to 9500 nm, and the typical error of accuracy and repeatability is less than 1%, which has high measurement accuracy. All other indicators are in line with the international standard ISO-13321.
On April 23, 2010, Dandong Baxter received the CE certificate signed by SGS (Societe Generale de Surveillance SA), the world's largest certification body based in Geneva, Switzerland, and announced that Baxter laser particle size analyzer passed CE certification. Baxter thus became the first laser particle sizer brand in China to pass CE certification.
It is not difficult to see the domestic and international products. China's laser particle size analyzer has basically reached the international advanced level. In terms of new technology dynamic light scattering particle size analyzer, Chinese enterprises are also close to the international advanced level, and the test range has reached sub-micron and nano-level. It is only one step away from the most advanced sub-nano level in the world.
3 China's laser particle size analyzer industry development prospects
After only a few decades of development, China has not only achieved the “scratch-free†of the particle size instrument industry, but also developed into the world's largest particle size instrument market, and the fastest growing and most competitive market. The technological progress of domestically produced products is rapid, and the main performance of some domestically produced products has reached or is close to the advanced level of similar foreign products. At present, China has been able to produce almost all types of particle size test instruments. Compared with the imported particle size analyzer, the domestic particle size analyzer has obvious advantages in price and service. However, there are still significant gaps in technical performance, quality management, testing methods, and standardization.
Aside from the gap in the most intuitive technology, China’s production methods are also inadequate. The foreign instrument production process has been professionalized and standardized. Foreign instrument manufacturers generally carry out outsourcing production of components and components, and implement quality target management for component and component suppliers. The production process of the whole machine is only for component or component level assembly, and a strict inspection and testing system is implemented, thus ensuring The quality of the whole machine. Domestic particle size instrument manufacturers generally assemble, debug and test at the device level. In addition, the quality management system and detection methods are imperfect, the instrument has a high failure rate, and the average trouble-free operation time is short.
However, we are delighted to see that the development prospects of China's particle size analyzer industry are very impressive. At present, the four major domestic brands: Zhuhai Omega, Dandong Baxter, Chengdu Jingxin and Jinan Weiner have occupied 80% of the domestic market, which is the market's biggest affirmation of domestic granular instruments.
It is worth mentioning that the development of particle size analyzers in China occupies a unique advantage. First of all, the domestic particle size analyzer is backed by China's most dynamic demand market. Enterprises can grasp the pulse of market development and the market is relatively stable, which is a strong backing for enterprise development. Secondly, China has a strong R & D team and a strong sense of innovation, and can constantly improve its own technical and other deficiencies. Third, at present, imported particle size testing instruments have established numerous marketing and service organizations in China, which facilitates the exchange of technology between China and international advanced particle size analyzer manufacturers.
In the arena of the development of international particle size analyzers, we can't expect our opponents to stop. Only when we accelerate ourselves can we take the lead. We believe that in the future, China's particle size testing industry will continue to improve in terms of technology, performance, quality, and service. The particle size instrument market will develop healthily and steadily, and the era of domestic laser particle size analyzers is coming.
Sectional Door Accessories: motor 220V-380V, control box, spring break device, cable break device , aluminum alloy rope pulley, enhanced shaft bracket, air bag system, duplex enhanced guide wheel bracket.
Detail introduction for above main accessories
1.Motor and controller:
The garage door operator is designed for residential overhead sectional and tilt doors.
The operator memorizes the limit positions and unique braking system that slows the unit down at the end of its travel.
Rolling code remote control with max. 20 pcs hand transmitters.
The operator is equipped with a manual release lever which allows manual operation of the door in case of power failure.
The controller has a security LOCK function which prevents operation of the door from transmitter.
2.spring break device:
Sectional doors are hinged and they bend in the tracks as the door opens and closes. Many of these doors are counterbalanced with extension springs, also designated "stretch springs," and they have seven characteristics. The length is the measurement of all the coils pressed together. This, along with the inside diameter of the coils and wire size - the thickness of the wire from which the springs are made - determine the stretch, the distance the spring is extended - normally half the door height, and pull, the force the spring pulls when stretched its normal length. The type of ends determine how the ends of the spring are mounted. The initial tension is the percentage of pull needed to separate the coils. This is determined by the pitch with which the springs are wound. On sectional garage door springs this is normally 15 percent. For example a 100 pound pull spring requires 15 pounds of weight to separate the coils; when a door is open the two springs will support 15 pounds of door weight without any stretch.
Most extension springs are made of oil tempered wire. These are normally coated or painted. Some springs are made of galvanized wire.
3.able break device:
cable break device ,door hardware
adjustable bottom bracket .
the raw material hot plate
zinc plated
safety device
adjustable bottom bracket
the raw material hot plate
zinc plating
spring safety device ,2" and 3" safety device
once the cable is broken ,this devoice can keep the hurt away from the door falling
4.aluminum alloy rope pulley
Equipment: CNC stamping/punching machine, CNC bending machine, CNC cutting
machine, 5~250 tons punching machines, welding machine, polish machines...
Processed material: stainless steel: copper, carbon steel
Surface treatment: Hot galvanized, polishing
Making process:Stamping, deep drawing,bending, punching, laser cutting,threading,
welding, tapping, riveting, grinding
5.air bag system
It is a safety device. When the door is down to hit something, it will up automatically.
Operation pressure:<3mbar
Battery:CR2032*2
Battery lifetime>1 year
Emission frequency: 315MHZ
Emission power:<10mW
Receiver power source:12V
6.duplex enhanced guide wheel bracket
Determining the right type of sectional door roller for your garage door tracks can be a little confusing, especially when you do not know what you need to look for in a garage door roller. To simplify things, there are two primary things you need to be aware of. First are the actual dimensions of the roller, and second is purpose that you will be using the door for. You can read below about measuring your roller and choosing the right quality of material for your door.
Other Door Accessories,Electronic Door Accessories,Automatic Door Accessories,High Speed Door Radar Detector
Shenzhen Hongfa Automatic Door Co., Ltd. , https://www.hfautodoors.com