Body over wedge pneumatic grips

Wedge grips with pneumatic actuation

With specimen grips from the body over wedge portfolio, the position of the jaws remains constant in the test direction as the specimen is gripped. This means that the grip-to-grip separation does not depend on the specimen thickness.

Advantages & features

Function description

The pneumatic specimen grips emphasis is on fast, reproducible and, most importantly, parallel gripping. Full gripping force is available right from the start, so that the static jaws transmit the test speed directly to the specimen.

Simple extensions are used in combination with temperature chambers The pneumatic actuator is positioned outside the chamber.

Advantages

Whether you are testing sensitive specimens or specimens with short clamping lengths, these symmetrically designed grips guarantee optimum clamping.
When determining the exact nominal strain the grip-to-grip separation does not depend on specimen diameter. This minimizes set-up time.
Reduced weight plus a compact design simplify handling, ensure short heating and cooling times in the temperature chamber. and enable long travel.
Absolutely secure gripping right from the start of the test for specimens prone to light slippage.

Pneumatic control unit for specimen grips

The closing force of the pneumatic grips can be steplessly set via a pneumatic control unit, which ensures the safe gripping of a wide range of different materials. The opening and closing of the specimen grips can be controlled by foot switches or the remote control of the materials testing machine for greater operating comfort.

More information about the pneumatic control unit

Technical overview

Type	8304
Item No.	1004956¹²
Test load F_max	10	kN
Operating principle/identification	Double-sided closing (wedge action)
Gripping force at 6 bar	18.46	kN
Gripping force at 10 bar	28.75	kN
Operating pressure, min.	1 ... 10	bar
Dimensions
Height	131 (280)	mm
Width	185	mm
Depth	185	mm
Opening width, max. with jaws	6.5	mm
Gripping area
Height	55	mm
Width	35	mm
Clamping length	Min. 20	mm
Weight per specimen grip, approx.	13,7	kg
Connection, stud	Ø 20	mm
Ambient temperature	0 ... +50	°C
Ambient temperature with extension piece	-70 ... +250	°C
Scope of delivery	2	pieces

Recommended and approved for strain rate control to the standards DIN EN ISO 6892-1:2009 and ASTM E8-09
In connection with an extension piece for temperature chambers the specimen grips can be used at temperatures from -70 ... 250°C (pneumatic actuator is located outside the temperature chamber).