2 years ago

MDA Technologies 5/2016

MDA Technologies 5/2016

ubbles of air that

ubbles of air that accumulate on or near the surface of the fluid. As an air-in-oil dispersion, this can cause a number of operating problems throughout the system. In severe cases, the foam can leak out of the machine through breathers and sight glasses. Foam is an efficient thermal insulator, so the temperature of the oil can become difficult to control. This can cause efficiency losses for the energy used, operational malfunctions and a reduced service life of the oil. The presence of air bubbles in the fluid can lead to excessive oxidation, cavitation, the reduction of lubricating properties of the oil and hydraulic system failure. Cavitation in the pump also increases noise generation in the system drastically, which in extreme cases can lead to a total breakdown and therefore to a system standstill. Diffusers to the rescue Diffusers effectively reduce the aeration, foaming, turbulence and noise caused by return lines. Reservoirs, baffles, and return lines should be designed to prevent the formation of foam and bubbles. But for added protection, a diffuser can be positioned near return lines to break up foam bubbles as they enter the reservoir. The German company Stauff manufactures diffusers along with various other hydraulic products and systems. The design of its SRV series diffusers is based on two concentric steel tubes where the perforated outlet sections are offset to each other. Due to the offset in the 2 concentric steel tubes the oil in the return flow slows down and effectively settles down. This prevents the formation of oil foam and permanently reduce noise generated in hydraulic reservoirs. It also effectively prevents the raising of sedimentation and soil deposits from the bottom of smaller tanks. Diffusers are an ideal supplement to return-line filters with threaded outlets. They are connected directly to the return line or to the filter bowl of the filter housing using BSP or NPT internal threads. The diffusers are positioned fully 01 Diffusers from SRV series 02 Return line filter from SRV series underneath the minimum liquid level of the reservoir, ideally with the closed surface of the outer steel tube facing the suction end of the pump. Flow diffusers are becoming more popular as reservoirs become smaller. In the past, large reservoirs were specified to provide plenty of time for entrained air to rise to the fluid surface. With smaller reservoirs, however, fluid spends less time in the reservoir, so there is less time for air to rise to the surface. Stauff’s extensive product range offers diffusers for a maximum operating pressure up to 20 bar (in the return line) and the operating temperature range of – 20 to + 100 °C, covering the complete spectrum of required flow rates up to 950 l/min. Photographs: Walter Stauffenberg GmbH & Co. KG 03 Open reservoir with oil foam MDA Technologies 5/2016

Precision ring drive system for high speed and high torque USA based Nexen Group, introduces the Compact Ring Drive (CRD) system with precision grade bearing and drive mechanism in a sealed housing. The freely programmable and 3-drive design configurations allow the CRD system to be optimized for high speed and high torque, both, depending on the application. With a 250 or 350 mm dial plate bolt circle diameter and a large open center, users can even optimize the performance in a small space. The combination of Nexen’s roller pinion technology with integrated bearing and motor/gearhead (drive mechanism) deliver a smooth system with zero backlash options from the motor through the driven load. The CRD is ideal for applications including cutting systems, gantry systems, medical products, robotics, aerospace, machine tool, semiconductor and material handling. Nexen’s Compact Precision Ring Drive system offers indexing precision up to ± 30 ArcSec and repeatability up to ± 5.1 ArcSec. The CRD system is smooth in motion and has a high output load capacity of up to 108 kN, and can handle speeds of up to 225 rpm. Nexen produces roller pinion systems, industrial brakes, clutches, torque limiters, overload protection devices and control systems. Edge protection profiles with and without sealing function Edge protection and sealing profiles from Ganter ensure reliable front closure, for example on flaps. They also speed up the production phase because deburring and handling the edges can practically be eliminated. GN 2184 is available in two sizes and is made of extruded PVC. Edge protection sealing profiles GN 2180 and GN 2182 provide both edge protection and sealing. Consisting of a clamping profile and co-extruded hollow chamber sealing profile featuring soft design, they are available in various sizes. The clamping insert in this case is made of a combination of steel wire and polyester. The sealing profile is arranged on the top or side of the clamping profile. The profiles are made of EPDM or NBR or from a combination of PVC and EPDM. The materials used are designed to be permanently elastic and feature excellent resilience, which ensures that sealing properties are retained long-term. All profiles meet the requirements of RoHS and REACH. The EPDM profiles of GN 2180 are also certified to UL 50 and UL 94-HB. Frequency converter series with variable drive solutions Schneider Electric has added two frequency converters with variable and intelligent drive solutions to its portfolio. The company offers specialized solutions for machine construction and industrial applications. The Altivar Machine series supports the needs of machine manufacturers and covers the complete range – from simple to high-technology applications. The manufacturer focuses especially on a simple, user-friendly product in the Altivar Machine series and therefore offers a wide range of communication interfaces and protocols such as Modbus Serial, CANopen, Modbus TCP & Ethernet/IP, EtherCAT, Profinet and Powerlink. The Altivar Process series is specially designed for water management, the oil and gas industry as well as mining and the food industry. Typical applications include pumps, fans and compressors in systems that convey gases or liquids. Environmental compatibility was especially important in the design of Altivar Process. Thus 70 % of its components are recyclable. Vibration sensor makes it possible to stop the power plant with a precise setting PRODUCT NEWS In a wind power plant that has to be shut down due to a hazardous situation, the phase position of the tower vibration in which the power plant is stopped, zero crossing or maximum, may be crucial. This point can be set with the SIL2 vibration sensor type NVA115 from TWK. If the tower vibrations exceed the permitted limit value, the two safety contacts open and the safety chain is interrupted. The sensor records vibrations from 0.1 to 60 Hz and protects the system against damage caused by vibrations. The measured value is analyzed by an adjustable frequency filter and directed to three types of interfaces: Two analog, for example for the x and y axis, CANopen Safety and two secure switching contacts. The measured value of the acceleration can be exported and further processed as an instantaneous or peak value, an RMS average or as an integrated value. The NVA115/S3 also features a Fourier frequency analysis that determines the frequency spectrum. MDA Technologies 5/2016


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