LJM (Luoyang Precision) Bearing Factory has got the ISO 9001:2000
International Quality System Certification, which is specialized in
designing, developing, manufacturing and selling the large-sized and medium-sized thin section bearing (light series bearing) and slewing bearing . The company situated in the Jianxi Technology Zone of  Luoyang City, which covers above 20000 square meters and has more than 100 producing & processing equipments, 200 workers, 50 professional  technical, management and R& D staff.


The company specialized in developing and manufacturing various kinds  of bearings with outer diameter of 100 mm to
3000 mm .

The core products of the company are:
•  Large large-sized and medium-sized thin section bearing;
•  Large large-sized and medium-sized slewing bearing;
•  Large large-sized and medium-sized cylindrical roller bearing,
   tapered roller bearing and spherical roller bearing;
•  Four point contact ball bearing
•  Substitution bearings of Imported bearings (SKF, INA)

  The other products of the company are thrust spherical roller bearing, thrust ball bearing, deep groove bearing and mining machinery, such as Jaw crusher series, Impact crusher series, Ball mill machines and so on.   The products of LJM are widely used in the fields of farm machine,  metallurgy, mining, petroleum exploration, architecture, transportation  and so on. Our products are widely sold at home and had been sold to Europe and Southeast Asia .

  We adopt modern scientific management system, international advanced
equipments and strict quality control system to make every product to
meet the requirements of the standard of quality .

The company insists Quality First and Credit First and we sincerely
provide high quality bearings with the lowest price and the best service
to you.

 

While membrane-based separations of liquids from solids have enjoyed increasing popularity over the last 20 years, the technology has an inherent Achilles heel that affects all membrane devices: fouling. This long-term loss in throughput capacity is due primarily to the formation of a boundary layer that builds up naturally on the membranes surface during the filtration process. In addition to cutting down on the flux performance of the membrane, this boundary or gel layer acts as a secondary membrane reducing the native design selectivity of the membrane in use. This inability to handle the buildup of solids has also limited the use of membranes to low-solids feed streams.

(Figure1)

To help minimize this boundary layer buildup, membrane designers have used a method known as tangential-flow or cross-flow filtration that relies on high velocity fluid flow pumped across the membranes surface as a means of reducing the boundary layer effect. (See Figure 1)

In cross-flow designs, it is not economic to create high shear forces, thus limiting the use of cross-flow to low-viscosity (watery) fluids. In addition, increased cross-flow velocities result in a significant pressure drop from the inlet (high pressure) to the outlet (lower pressure) end of the device, which leads to premature fouling of the membrane that creeps up the device until permeate rates drop to unacceptably low levels.

(Figure 2)

Instead of producing high cross flow, an alternative method for producing intense shear waves on the face of a membrane is developed. The technique is called Vibratory Shear Enhanced Processing (VSEP). In a VSEP System, the feed slurry remains nearly stationary, moving in a leisurely, meandering flow between parallel membrane leaf elements. Shear cleaning action is created by vigorously vibrating the leaf elements in a direction tangent to the faces of the membranes.

The shear waves produced by the membrane's vibration cause solids and foulants to be lifted off the membrane surface and remixed with the bulk material flowing through the membrane stack. This high shear processing exposes the membrane pores for maximum throughput that is typically between 3 and 10 times the throughput of conventional cross-flow systems. (See Figure 2, above)

The oscillation produces a shear at the membrane surface of about 150,000 inverse seconds (equivalent to over 200 G's of force), which is approximately 10 times the shear rate of the best conventional cross-flow systems. More importantly, the shear in a VSEP System is focused at the membrane surface where it is cost effective and most useful in preventing fouling, while the bulk fluid between the membrane disks moves very little.

Because VSEP does not depend on feed flow induced shearing forces, the feed slurry can become extremely viscous and still be successfully dewatered. The concentrate is essentially extruded between the vibrating disc elements and exits the machine once it reaches the desired concentration level. Thus, VSEP Systems can be run in a single pass through the system, eliminating the need for costly working tanks, ancillary equipment and associated valving.

The disc pack hold up volume of a system with 1,400 ft2 (130 sq. meters) of membrane area, is less than 50 gallons (189 liters). As a result, product recovery in batch processes can be extremely high.

 
Emulsified oil are serving as lubricant as well as coolant in various metal industries such as steel making and metal cutting. Disposal of emulsified fluid is a very tough environmental pollution issue. It has high COD and oil/water fully emulsified. Conventional bio-chemical treatment consumes large amount of chemicals and high running cost yet still requires multiple post-treatment steps. The disposal of solid cake will ultimately contaminate underground water. Conventional membrane treatment faces low flux and severe fouling issues. VSEP can simplify treatment process. It has high anti-fouling ability and high recovery ratio. Concentrate can be put as fuel and permeate can achieve discharge standard.

At startup, the VSEP system is fed with a slurry and the concentrate valve is closed. Permeate is produced and suspended solids in the feed are collected inside the VSEP filter pack. After a programmed time interval, valve on concentrate line is opened to release the accumulated concentrated solids. The valve is then closed to allow the concentration of additional feed material. This cycle repeats indefinitely.

Membrane selection is the single most important parameter that affects the quality of the separation. Other important parameters that affect system performance are pressure, temperature, vibration amplitude, and residence time. All of these elements are optimized during testing and entered into the programmable logic controller (PLC) which controls the system.

The operating pressure is created by the feed pump. VSEP machines can routinely operate at pressures as high as 500 psig (35 bar). While higher pressures often produce increased permeate flow rates, they also use more energy. Therefore, an operating pressure is used that optimizes the balance between flow rates and energy consumption.

The vibration amplitude and corresponding shear rate can also be varied which directly affects filtration rates. Shearing is produced by the torsion oscillation of the filter stack. Typically the stack oscillates with an amplitude of 3/4 to 1 1/4 inches (1.9 to 3.2 cm) peak to peak displacement at the rim of the stack. The oscillation frequency is approximately 53 Hz and produces a shear intensity of about 150,000 inverse seconds.

Feed residence time is set by the frequency of the opening and closing of the exit valve (valve one). The solids level in the feed increases as the feed material remains in the machine. Occasionally, a cleaner is added to the membrane stack and continued oscillation helps clean the membrane in minutes. This process can be automated and only consumes approximately 50 gallons (189 liters) of cleaning solution thus reducing cleaner disposal problems inherent with other membrane systems.

Control system

VSEP systems are supplied with internationally branded Programmable Logic Controllers. All components are fully contained in a NEMA 4 rated enclosure.

Various levels of control sophistication are available depending on the complexity of the application. For polishing or low solids applications simple controls having minimal outputs and inputs are provided. For high solids applications controls with more features are used to insure trouble free operation. The VSEP controller typically sets solids levels by actuating the exit valve based on operating parameters such as pressure or flow rate.

Other control options available include automatic clean-in-place, automatic flush, automatic shut down, full alarm features with digital diagnostic displays, remote diagnostics and monitoring, and many others. Dunwell engineers have spent years perfecting VSEP controls to maximize reliability and to minimize operator intervention.

Clean-In-Place

Clean-In-Place, CIP, is a package of pre-connected pipes, valves, tanks, pumps serving to clean the filter pack in steps by washing and flushing. Different cleaner can be applied according to different fouling chemistry. Piping has different material and different grade of polishing according to applications. One CIP can serve up to 6 i-series VSEP. Customer can choose either fully manual or fully automatic or somewhere in between according to individual application.

Custom Stack Analysis

Custom Stack Analysis, LLC., was originally established in Alliance, Ohio, in 1965 by Mr. Ernest Kolm. In the year 2000, the company was acquired by Mr. James K. Gray, who has over 18 years experience in the field of air emissions testing. In the year 2005 Custom Stack Analysis, LLC. acquired the source testing assets of Envisage Environmental, Inc. Custom Stack Analysis, LLC. has capabilities for performing Stack Testing, Industrial Hygiene, Analytical Services, Burner Combustion Efficiency, Radon Testing and Indoor Air Quality. The company has performed work not only for small companies, but also many fortune 500 companies. A professional staff can ensure that any of your environmental needs are met with quality and competitive pricing.

Custom Stack Analysis, LLC., has been providing air emissions testing for the past 38 years. In this time, they have performed testing for many prominent clients, such as Stericycle, Inc., Goodyear Tire & Rubber Co., and WCI Steel, along with many other prominent companies. The company has extensive knowledge in testing for medical waste incinerators, printing operations, steel foundries, asphalt facilities, power plants, petroleum refineries, chemical plants, brick manufacturers, lumber processing, hazardous waste incinerators, rubber manufacturing, roofing production, plastic manufacturers, and many other types of operations. The company has also been providing its services to engineering companies, government agencies, and control system designers. The company has experience providing services internationally including Canada, Puerto Rico, Jamaica, Dominican Republic, Caribbean Islands and South America. If you have an international project that requires our services be sure to give us a call. In 2009 Custom Stack Analysis, LLC. joined a service alliance with Zaff International/Hi-Tech Ltd. for providing services in Saudi Arabia and the Gulf Coast countries.

Custom Stack Analysis, LLC., has an excellent performance reputation in working with many prominent Clients in Ohio and throughout the United States. The company is noted for its ability to deliver quality services in accordance with project schedules, and to provide responsive assistance to Clients in emergency situations.

Custom Stack Analysis, LLC., has a company policy of providing high quality services to clients. The company also has a strong commitment for safety on the job for its work force, which includes USEPA’s safety, health, and environmental management training program for field activities for all employees.

Custom Stack Analysis, LLC., is an active member in the Air & Waste Management Association, Source Evaluation Society, Ohio Chamber of Commerce, and Carolina Air Pollution Control Association.

                      NANOTEKNOLOJi(NANO  TECHNOLOGY)


Nanoteknoloji maddenin atomik ve moleküler seviyede kontrol etme bilimidir. Genel olarak 100 nm ve daha küçük boyutta malzeme ve aygıt geliştirmekle ilgilidir. 1 nm, metrenin milyarda biridir.

Nanoteknoloji birçok alanı kapsayan bir bilim dalıdır. Aygıt fiziği, malzeme bilimi, elektronik, kimya, biyoloji gibi dallardan bilim dallarından araştırmacılar, nanoteknoloji çalışmaları yapmaktadır.

Nanoteknolojinin etkileri üzerinde çok tartışma olmuştur. Nanoteknolojinin tıp, elektronik ve enerji üretimi gibi alanlarda uygulanma potansiyeli vardır. Bunun yanında, her yeni teknolojide olduğu gibi, nanomalzemelerin de sağlık ve çevre üzerindeki etkileri merak edilmektedir.

GEÇMİŞİ:

Nanoteknoloji kelimesini ilk defa kullanan Tokyo Bilim Üniversitesi'nden Norio Taniguchi olmuştur. 1974'de yayınlanan bir makalede Taniguchi'nin tanımı şöyledir: "'Nano-teknoloji' genel olarak malzemelerin atom atom ya da molekül molekül işlenmesi, ayrılması, birleştirilmesi ve bozulmasıdır." Nanoteknoloji kelimesinin ortaya çıkmasından önce, fikir olarak dile getirlmiştir. Bunlardan en erkeni Richard Feynman'ın "Aşağıda Daha Çok Yer Var" adlı konuşmasıdır. Feynman bu konuşmasında atomları ve molekülleri kontrol etmeyi becerebileceğimizden, bunu yapabilmek için de yeni aletlere ihtiyacımız olduğundan bahsetmiştir. Atomik seviyede yer çekimi kuvvetinin öneminin azalacağına, Van der Waals gibi zayıf kuvvetlerin öneminin artacağını da belirtmiştir. Feynman'ın yanında bir başka fikir adamı ise Eric Drexler'dır. 1986'da yayınladığı "Yaratma Motorları: Nanoteknolojin Yaklaşan Devri" ve "Nanosistemler: Moleküler Mekanizmalar, Üretim ve Hesaplama" kitaplarında istediğimiz maddeyi atom atom dizerek oluşturan nanorobotların varolabileceğini ispat etmeye ve bu teknolojinin etkilerini ortaya çıkarmaya çalışmıştır. Ayrıca "Yaratma Motorları: Nanoteknolojin Yaklaşan Devri" yayınlanan ilk nanoteknoloji kitabıdır. Nanoteknolojinin gelişmesini sağlayan buluş ise Tarama Tünelleme Mikroskobu'nun keşfedilmesidir. Bu mikroskop sayesinde iletken bir yüzeydeki atomların yerleri değiştirilebiliyordu. Bu gelişmeyi 1986'da fullerinelerin ve karbon nanotüplerin keşfi izledi. 2000'de ABD'nin nanoteknolojiye yatırım yapması sonucu tüm Dünya'nın birçok ülkesinde nanoteknoloji araştırmaları başlamış oldu.





    NANO TEKNOLOJİ ÜRÜNLERİKULLANAN LİDER FİRMALARDAN BİRİ:

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cooling tunnel

Process-related facility systems

Process-related facility systems often call for customized system solutions since different products need different conditions of manufacture and storage. That's why caverion provides not only standard system solutions but also custom-made ones, because the most suitable solution cannot be ready-made!

Whether your production or activity requires particular ambient conditions or a super-clean working environment, or it has to comply with safety or environmental regulations – we look for the best solution together with you. Benefit from our know-how