The principle of Torque Wrench

Torque Wrench - also called Torque Wrench or torque wrench, torque is the product of force and distance, when fastening screws threaded fasteners, such as bolts and nuts need to control the size of the torque applied to ensure that the thread tight and not because of the torque is too large thread damage, so use a torque wrench to operate. First, set the upper limit of the value of a good torque required when the applied torque reaches the set value, the wrench will be issued, "Cartagena" sound or a little wrench junction bend angle, which representatives have tightened do not add capacity.

Works

Principle torque wrench issued Kata sounds very simple, can be divided into the following steps to understand:
1,A torque wrench is issued, "Cartagena" sound is prompted you have reached the required torque value up.
2, "Catania" is released by its own internal structure of the torque produced, which structure is divided into a pressure spring, the release of the joint torque, a torque wrench torque ram three structures composed emitted.
3, the first set on the torque wrench required torque value (set by the spring torque on the plunger to release the pressure on the joints), locking torque wrench, tighten the bolts began. When the bolt reaches the torque values ​​(greater than when using a torsion spring pressure), it will produce an instant effect disjointed. Issued a joint percussion, "Cartagena" sound emitted by metal wrench instantly produce disjointed effect. Thus to achieve torque values ​​confirm the reminder (in fact, as we have a 15 degree bend arm joints on iron tube encounter straight pipe after the instant application of the same principle).
Mentioned above are the most commonly used manual torque wrench, in addition to electric torque wrenches, pneumatic torque wrenches.

Structure

Torque wrench, also known as torque, torque screwdriver. It is based on the principle of beam bending, torsion and bending principle coil spring compression principle and design, can measure the torque acting on the nut size.
There are flat-type torque wrench and dial two. Torque wrench has a long elastic rod, which is filled with a handle at one end and the other end is equipped with square head or hex head, square head or hex head in an interchangeable sleeve suits, stuck with the ball. In the top end is also equipped with a long pointer. Scale plate fixed to the handle base, each grid scale is 1N (or kg / m). Before use, the first indicator mounted on the wrench is adjusted to the desired torque, and then pulling the wrench, when the predetermined torque is reached, the pointer indicator on the pin will be rotated to one side, and finally the pointer collisions with pin to inform the operator through speaker signal or sensor signal.