Typ ZEK®
An electric torque wrench is a combination of a planetary transmission with an intermediate transmission and an electric drive. The drive incorporates an electric motor and an electronic control circuit. Adjustment of the tool with setting the desired torque is enabled by the torque controller.
An electric torque wrench is a combination of a planetary transmission with an intermediate transmission and an electric drive. The drive incorporates an electric motor and an electronic control circuit. Adjustment of the tool with setting the desired torque is enabled by the torque controller. An electric tightening machine can be also referred to as an automatic torque device with adjustable torque suitable for tightening and loosening of bolts.
The planetary transmission gear also referred to as the ‘torque multiplier’ of ‘amplifier” is a simple tool designed to tighten and undo bolts and nuts, in particular the ones of large sizes. Bolts or nuts can be tightened to the torque of e.g. 1000 Nm (100 kGm) with the force of merely two fingers. The wrench (transmission gear) has a protective component, so called safety stud that is sheared when the applied force may be possibly too high. It prevents the transmission teeth from damage and makes the device sturdy and reliable. To tighten a bolt with controllable torque the operator has to attach a torque wrench with the setting range up to 400 Nm to the input (driving) bit with the square ½” (¾”) cross-section size. The required setting value for the input torque is to be read from a table that accompanies each transmission gear. It is the value that has to be set on the torque wrench. The desired torque is reached when a click is heard during tightening. Obviously, a handle with a ratchet is used to undo the bolt or nut, which enables quick detachment of the connection without the need to disengage the handle.
On the contrary to hydraulic torque wrenches the hydraulic bolt tensioners enable initial tensioning of bolts/studs without application any torque since the tensioning force is applied in line with the central line of the bolt/stud usually towards the expanding direction. Therefore the pre-tensioning force of bolts is independent on the friction coefficient. The bolt tensioners are actuated by means of a hand pump or electric pump or pneumatic pump with the output pressure of 800 or 1600 bars depending on the unit version. Optional and customized designs of the bolts tensioners with various values of pre-tensioning force, size and application procedures are available upon individual orders.