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tox10214technical articles

Reliable presses and production facilities are equipped with the safety brakes for the pneumohydraulic drive cylinder "TOX power pack" and for the "TOX-Electric Drive" electromechanical servo drives as well as the safety controllers and the safety protection housing. Equipped in line with standards and adapted to the high demands of industrial multi-shift operation, interfacing with the interface is unnecessary.


With the introduction of the new machine directive 2006 / 42 / EG at the end of the year 2009, the two standards EN ISO 14121 (assessment of the risk analysis) and EN ISO 13489 (safety of the machines) became valid for the practical implementation. In addition, the extension of EN ISO 13489 with regard to "performance level e" was formulated in the following years, so that today every manufacturer has clear specifications and the previously applicable standard 98 / 37 / EG has now been completely replaced. For some manufacturers of production systems, which work with pressing force and with combined lifting / pressing force sequences, the conversion of the new machine guideline resulted in considerable changes because it is no longer enough to attach a CE shield.

Safety has priority

tox20214For the TOX Pressotechnik GmbH & Co. KG from Weingarten, the new Machinery Directive, apart from the documentation accompanying the machine, did not bring any major changes, because machine and operational safety has always enjoyed a high priority and has been consistently implemented. For example, years ago, and as one of the first press manufacturers to do so, the company equipped and supplied press-equipped manual work stations in accordance with the highest safety category 4 (EN 954-1).

With standard components for the security system

tox30214The current scope of standards in the Allgäu has consistently led to closely graded and complementary safety components both in drive technology components and assemblies as well as in subsystems or dockable subsystems as well as in complete production solutions. So there are z. B. for the pneumohydraulically powered drive cylinder powerhouse the holding brake ZSL "Safety Lock", which is pneumatically kept open and acts at pressure drop.

It uses the energy of the sinking load to generate the clamping force. The clamping force is built up when the working piston moves in the direction of the load, wherein the self-reinforcing static friction then pulls the catching jaws into the clamping position. If the load is further increased, the piston rod will remain in the clamping position regardless of the load, as long as the static holding force is not exceeded. The release of the single-acting holding brake is done by pressurizing and by moving up the piston rod.

Complete solutions with safety technology

tox40214There is also a safety holding brake for the Electromechanical Electric Drive type EPMK servo drives, which can be used as an alternative. This reliably prevents the sinking of the weight-loaded working piston, which is in principle a prerequisite for the mentioned highest security level "performance level e" applies. Depending on the size, the servo drives generate pressing forces up to 700 kN, whereby the holding brakes are designed so that their holding force is at least 5% of the respective nominal force. This gives a high load reserve.

The third component of the safety concept would be the control technology used in each case, starting with simple safety controllers of type STE up to the complex SPS S7 with individually selectable options. Furthermore, there are various mechanical safety components such as the SU safety enclosure, which can be combined with the SUT safety door if required.

The housing SU, which is usually mounted on three sides of a machine, fixture or press system, consists in the standard version of a sturdy aluminum profile frame in which the wall material (polycarbonate or perforated metal sheet) is picked up and fixed. The open side (loading front) must be secured by a light barrier system or by the protective door SUT. The safety door SUT is driven pneumatically and is provided with the necessary components for integration into the system control.
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