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Pneumatic actuation
SITEMA - Safety Brakes
Technical Information
TI-B10-EN-04/2009
SITEMA GmbH & Co.KG . Im Mittelfeld 10 . D-76135 Karlsruhe . Phone: +49 (0)721 98661-0 . Fax: -11 . www.sitema.com 1/3
Technical Information TI-B10
Safety Brakes type KSP
.. High holding force by self-intensifying clamping
.. Pneumatic actuation
.. Secure against overloading
Contents
1 Purpose ....................................................................... 1
2 Function........................................................................ 1
3 Control .......................................................................... 2
4 Choosing the right size............................................... 3
5 Rod requirements........................................................ 3
6 Operating conditions................................................... 3
7 Own hazard analysis .................................................. 3
8 Overall dokumentation and CE mark ........................ 3
9 Regular functional checks.......................................... 3
10 Maintenance................................................................. 3
A detailed description of the control, assembly and operational
test of the SITEMA Safety Brakes can be found in the
„Operating Manual BA-B10“ .
1 Purpose
The KSP Safety Brake is designed and built to hold raised loads
on a piston rod or on a separate clamping rod. The following
purposes are possible and permitted:
1. Static holding
Static holding of a weight against gravity on a round rod and
securing load to prevent it falling in one direction. The size of
the KSP Safety Brake must be selected in such a way that the
static forces do not exceed the admissible load (nominal load
M) of the KSP Safety Brake as given in the „Technical Data
Sheet TI-B11“
2. Emergency brakes
Emergency brakes for a mass moving downwards in the specified
direction. In this direction the brake force is high (higher
than the nominal load) but limited to ensure well-defined energy
dissipation.
The national and international regulations regarding safety as
far as applicable to the particular case must be observed.
The KSP Safety Brake is typically used as a clamping mechanism
or emergency brake in the following applications:
• Vertical drives of loaders
• Vertical or diagonal machine tool axes
2 Function
Fig. 1: Structure, clamping released
As shown in Fig. 1, the clamping system consists of a conical
clamping sleeve (1) with an outer cone moving within a clamping
ring (2). This whole clamping system is movable inside the
housing (3) against the force of the disc springs (4). In released
condition, the annular piston (5) keeps the clamping sleeve
pushed against the set of disc springs (6) by pneumatic pressure,
so that the shaft can move freely in both directions.
Static holding of the load
Fig. 2: Clamped, maximum load equals nominal load
At zero pressure the clamping sleeve (1) is pushed into the
cone of the housing by a set of disc springs (6), whereby an initial
friction contact between rod and clamping sleeve is
achieved. If a load is now acting on the rod, the clamping process
becomes self-intensifying.
6
1
2
4
5
p
3
Load direction Load direction
6
1
2
4
5
3
English translation of German original
