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Safety Shock Absorbers SDH38 to SDH63 (high rack damper, optimised characteristic)

Manual

General instructions

This manual is for the disruption-free use of the product

types listed on page 1; its compliance is a prerequisite

for the fulfilment of any warranty claims.

Therefore, make sure to read this manual before use.

Please always maintain the specified limits from the per-

formance table (technical data). Take into account the

predominant environmental conditions and restrictions.

Note the regulations of the trade association, TÜV or

corresponding national, international and European reg-

ulations. Installation and commissioning only according

to mounting instructions.

Safety information

WARNING

If ACE safety shock absorbers are used where a failure of

the product could lead to personal injuries and/or material

damage, additional safety elements must be implemented.

Free-moving masses can lead to injuries by crushing

during installation of the shock absorber. Secure moving

masses against inadvertent starting with suitable safety

precautions before installing the shock absorbers.

Intended use

ACE safety shock absorbers are machine elements to brake moving

masses in a defined end position in emergency stop situations

for axial forces. The safety shock absorbers are not designed for

regular operational usage.

Description and function

The ACE safety shock absorbers SDH38 to SDH63 are mainte-

nance-free, ready-to-install hydraulic components with numerous

metering orifices. During the slowing down process the moving

mass moves with kinetic energy and, if necessary, an additional

drive energy in the axial direction of the piston rod with a defined

impact velocity against the rod end button of the shock absorber.

Alternatively, numerous shock absorbers can also be used in

parallel. During the initiated slowing down process the piston

rod is pushed into the shock absorber. The hydraulic oil located

before the piston is displaced through all metering orifices at the

same time. The number of effective metering openings reduces

in proportion to the driven stroke. The retraction speed reduces.

The dynamic pressure applied in front of the piston corresponds

to the counterforce applied by the shock absorber and remains

approximately constant over the entire stroke. A requirement for a

constant rate of deceleration is the correct calculation of the safety

Stand 03.2021

21_22_0019 Issue 05.2022

shock absorber and therefore the correct selection of the right

metering orifice pattern or the right hardness level of the shock

absorber.

General Function

F/p

s/t

F = Force (N)

p = Internal pressure (bar)

s = Stroke (m)

t = Deceleration time (s)

v = Velocity (m/s)

v = 2 m/s

v = 1,5 m/s

v = 1 m/s

v = 0,5 m/s

v = 0 m/s

p = 400 bar

p = 0 bar

* The load velocity reduces continuously as you travel through the stroke due to the

reduction in the number of metering oriﬁces (*) in action. The internal pressure remains

essentially constant and thus the Force vs. stroke curve remains linear.

Calculation and design

In order to ensure an optimum, fault-free and durable function of

the safety shock absorbers they must be correctly dimensioned

and designed. The following parameters must be known and used

in the calculation:

- Moving mass [kg]

- Impact velocity of the mass into the shock absorber(s) [m/s]

- Additionally acting propelling force, propelling power or propel-

ling torque [N, kW, Nm]

- Number of shock absorbers acting in parallel [n]

- Number of strokes or cycles per hour [1/h]

The correct size of the safety shock absorbers can be determined

with the ACE online calculation programme at www.ace-ace.de.

You can also send us the completed online form via e-mail for

checking.

Or make use of our free calculation service by phoning: +49

(0)2173 - 9226-20.

WARNING

The dampers must be dimensioned in such a way that the

calculated values do not exceed the maximum values of the

respective performance table (technical data):

[Nm/cycle]

Effective weight me

Max. side load angle [°]

The calculation and design of the suitable safety shock

absorber should be undertaken by or checked by ACE.

For a correct damping design the safety shock absorber

must represent the only braking system in an emergency

stop.

Delivery and storage

- After delivery please check the shock absorber for any damage.

- The shock absorber can become damaged if it falls. Carefully

remove shock absorber from the packaging.

- Shock absorbers can generally be stored in any position.

- Storage in the original packaging is preferred.

- Always store shock absorbers in a dry place in order to avoid

oxidation.

- The recommended maximum storage time is three years.

Maintenance and care

Safety shock absorbers are enclosed systems and therefore

do not need special maintenance. Safety shock absorbers that

are not regularly started up (e.g. emergency stop devices) are

checked at least once per year as part of the normal safety

check of the plant. Check that the return of the piston rod is in

the initial position, the damper is not leaking and the mounting

elements are properly secured. The piston rod must not exhibit

any damage. For safety shock absorbers that are regularly

operated, these checks should take place at intervals of no more

than three months.

Disassembly and disposal

Take account of environmental protection (recovery of problematic

substances) during disposal of the shock absorber. The SDH38

to SDH63 safety shock absorbers are filled with HLP 46. The

corresponding data sheet is available on request.

The SDH38 to SDH63 safety shock absorbers are repairable.

Faulty dampers can be sent to our service department for

determination of the cause of failure.

ACE Stoßdämpfer GmbH · Postfach 1510 · D-40740 Langenfeld · T +49 (0)2173 - 9226-10 (Technik -20) · F +49 (0)2173 - 9226-19 · [email protected] · www.ace-ace.com

ACE Stoßdämpfer GmbH · www.ace-ace.com