Applications of torque limiters can be found in all sectors of technique, in each and every machine or facility where torques have to be limited to protect machines or products from overload.
The torque limiter type ECA, which is especially engineered for belt drives prevents such overload damages or at least reduces them to a minimum.
Particular worth was put on compulsion-cutting and fast switching function. Simple, light elements avoid adverse dullness of mass or switching. They were chosen because to heavy switching elements could considerable increase the (static adjusted) disengagement torque in case of a dynamic collision and therefore also the destructive collision forces.
In contrary to conventional friction clutches the ECA has a very high repeatability of the adjusted disengagement torque. It’s free of clearance and self-reliantly re-engages after 1 turn.
The movement of switching can be sampled by a proximity switch. 17 design sizes make a total torque range of 0.5 Nm up to 470 Nm overall.
The ECA forms a very compact unit together with a crown gear, which hardly uses some additional place, and its deliverable in diverse versions (with keyway or conical bush).
Especially to be highlighted is the type ECA 1, because it’s one of the smallest torque limiters available on market, see therefore picture.
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The first semi-finished part made of Ultramid® Advanced N
BASF has now developed Ultramid® Advanced N5H UN, a polyphthalamide (PPA) that can be manufactured into semi-finished parts by extrusion. The plastics company GEHR, Mannheim, Germany is using the new PPA to produce extruded stock shapes with a diameter of 50 millimeters. Ultramid® Advanced N offers excellent mechanics at elevated temperatures due to its semi-aromatic chemical structure. It shows excellent resistance to chemicals and hydrolysis, even in aggressive environments, as well as good sliding friction properties – and all this at temperatures above 100°C. Due to its low water uptake its mechanical properties remain stable over a wide temperature range. Even in humid environments, the long-chain high-performance material shows a dimensional stability that belongs to the highest of all polyamides.
This property profile makes Ultramid® Advanced N the perfect material for extruding pre-fabricated components and small assemblies but also for many applications in the automotive industry, in mechanical engineering and in kitchen appliances. During machining, the behavior of the semi-finished products lies between a polyamide and a polyoxymethylene copolymer, with steady and consistent chip formation and removal.
“GEHR is the first company to successfully use a PPA for extrusion. With its expertise in extrusion, GEHR has developed stock shapes that can be produced without any voids”, says Philipp Wenz, group head in sales of BASF’s Performance Materials division. “We can’t say for certain whether it’s the world’s first semi-finished part made from polyphthalamide. The high-performance material has definitely not yet played an important role in the market for semi-finished parts. One reason for this might be that usual polyphthalamides cannot be extruded very well.” Thus Ultramid® Advanced N5H closes a gap in the market between semi-finished parts made of polyetheretherketones and polyarylsulfones on the one hand and semi-finished products made from engineering plastics on the other hand. In comparison to the latter it can be used at continuous operating temperatures well above 120°C. The BASF material is also suitable for profiles other than rods.
Bernhard Grosskinsky, Head of Application Technology at GEHR, explains: “BASF’s polyphthalamide is far easier to process compared to other PPAs on the market. It gives us a wide processing window with at the same time a high melt stability. The quality of the material always remains the same so that we can maintain a stable production of our semi-finished parts. Last but not least, another advantage of BASF’s PPA: It is easy to produce finished components from the semi-finished products by post-processing.”
A wide range of applications can be manufactured from GEHR’s extruded rods: Components with very high operating temperatures and pump parts requiring exact dimensional stability are just as feasible as gear wheels, thermostat housings and sliding rails. In the automotive industry, the material is particularly suitable for components that come into contact with motor and transmission oils, coolants, acids, salts and de-icing fluids. Parts that require high sliding friction properties can be used even at high temperatures due to the material’s high impact resistance and very low wear rate.
B.Bigler AG appointed as RadiciGroup distributor for Germany
A partnership to offer quality and flexibility to German customers
RadiciGroup High Performance Polymers announces a reorganization of its sales network in Germany: starting on 18th May 2020 B.Bigler AG is appointed as the distributor for the German market for a wide product range including RADILON®, HERAMID®, RADIFLAM®, RADISTRONG®, RADITER®, HERAFLEX®, TORZEN® and RADITECK®.
«Our Group – said Rolf Behringer, Sales Manager DACH of RadiciGroup High Performance Polymers – is taking one more step to strengthen its long-term presence in the German market partnering with an important and reliable company such as B.Bigler AG. Since long we have been cooperating with B.Bigler AG in Switzerland and now we are confident that, together with our sales team, we will be able to offer the highest level of quality and flexibility to our German customers».
B.Bigler AG provides its resident, well-established, and country-wide sales net and logistics hub in Weiterstadt guaranteeing fast delivery to customers.
«We are proud and glad to expand our partnership with RadiciGroup to the German market – said Reto Frei, Sales Director of B.Bigler AG – and we are looking forward to implementing the same successful collaboration as we have in Switzerland, driven by continuous growth. We are already well positioned in Germany, through local sales force and warehousing. This will be a benefit for all German customers looking for fast delivery of small quantities of materials, ranging from from 25 kg up to full pallets».
Total and Corbion commence production at Thai bioplastics plant
French energy group Total and its Dutch partner Corbion have commenced production at their new bioplastics plant in Rayong, Thailand.
The plant, which will be run by the joint venture Total Corbion PLA, is expected to produce 75,000 tonnes a year of poly lactic acid (PLA). The production profile will include a wide range of Luminy® PLA resins from renewable, non-GMO sugarcane sourced locally in Thailand. Products from the Thai plant would find application in the packaging, consumer goods, 3D printing and the automotive industries.
At the end of their life cycle, PLA products can be mechanically or chemically recycled, or sometimes composted and returned to the soil as fertiliser.
“The start-up of this state-of-the-art plant establishes Total Corbion PLA as a world-scale PLA bioplastic producer, ideally located to serve growing markets from Asia Pacific to Europe and the Americas” says Stephane Dion, CEO of the company. “The subsequent increase in global PLA capacity will enable manufacturers and brand owners to move into the circular economy and produce biobased products with lower carbon footprints and multiple end of life options.”
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