The hydromechanical spring-loaded cylinders of the ZSF series from Jakob Antriebstechnik offer robust and reliable clamping elements. These spring-loaded systems can be used wherever displaceable or movable machine parts must be temporarily clamped or locked. Other applications can be found in jig construction and for workpiece or tool clamping.
The spring-loaded systems interact mechanically-hydraulically. The clamping force is applied mechanically by a prestressed plate spring package. The hydraulics are only needed for the release stroke of the elements, whereby the tie rod or pressure pin is released. This system ensures a high level of operational safety, since the clamping force is always maintained at full height, regardless of oil pressure or leakage losses. In the operation the pressure or tension piston is alternately acted upon by the plate spring package or the hydraulic pressure. This means that the spring pack is compressed with increasing oil pressure, the spring force increases. At set pressure, the corresponding nominal clamping force is achieved as the reaction force of the plate spring package. To release the pressure or tension piston, a higher hydraulic pressure is required, which is proportional to the release stroke up to a maximum value. This means that the setting pressure is required only for the initial installation for exact force adjustment. In the actual operating cycle, the cylinders are driven either without pressure or with release pressure. For spring-loaded cylinders, a mandrel or tie rod is screwed into the threaded hole of the tensioning piston and secured (on request, in one piece or with special thread). Operation requires a hydraulic unit that should be equipped with a pressure gauge, a pressure relief valve, a switching solenoid valve and a pressure switching device.
The hydromechanical spring-loaded systems can score with many advantages. Due to the short operating times of the hydraulic unit, this system offers advantages in terms of economy. The acquisition costs are low, the reliability is increased, the application areas are diverse and the operation is very simple.
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Two additional production halls
Expansion of capacities for the production of consumables
The Eppendorf Group is expanding its production capacity at the Oldenburg in Holstein site in Germany by building two additional production halls. As a result, Eppendorf Polymere GmbH, a wholly owned subsidiary of Eppendorf AG, will increase its total capacity by around 30 percent from 2021. A milestone for this targeted expansion was reached May 14, 2020 with the topping-out ceremony for the second hall currently under construction. The first hall has already been completed and will start production operations this month.
In Oldenburg, Eppendorf produces laboratory consumables made of high-quality plastic such as pipette tips and tubes, microtiter plates and single-use bioreactor vessels. Currently, these products are in particularly high demand from diagnostic laboratories and vaccine manufacturers around the world who are researching vaccines against the corona virus or carrying out Sars Cov-2 tests.
“We are registering a steady increase in demand for consumables from Eppendorf. The current global battle against the corona virus is just reinforcing this trend,” says Dr. Wilhelm Plüster, Chief Technology Officer at Eppendorf AG. “With the construction of the two new production halls we are responding to this trend, which has been continuing for years. In addition, sustainability was taken into account in the construction of the buildings.” continues Plüster. The two production halls will be heated and cooled by an existing combined heat and power plant. This will considerably reduce energy consumption.