Shandong丨torque adjustable electric wrench
Jan 06, 2021
In the steel structure construction, mostly USES the high strength bolt as a fastener, and for the high strength bolts fastening all have strict requirements, because it affects the production safety, accident due to bolt fastening problems, in the past, use common manual wrench, bolt fastening experience alone, time consuming, it is difficult to guarantee quality, the use of electric torque wrench, torque adjustable electric wrench, in particular, convenient operation, torque adjustable, can not only ensure the quality of the fastening and greatly improve the working efficiency.
Torque wrench and torque wrench, torque wrench, torque adjustable wrench is a kind of wrench, torque adjustable electric wrench main characteristic is that may set the torque value and torque adjustable, torque wrench can be tight in the early and can eventually tight, when use, to adjust the torque to tighten bolts, first need to set torque value in advance, when the wrench to set torque value, the wrench automatically stop.
electric torque wrench TN-9B is recommended：
electric torque wrench TN-9B parameters:
Several problems should be paid attention to when using electric torque wrench:
1, high strength bolt fastening must be divided into two times, at the beginning of the first time for screw, the early solid to tighten bolts standard axial force (method) of 60% 80%, the screw torque values at the beginning of the end screw torque values shall not be less than 30%, the second fastening to finally shake, for all bolts evenly stress in the bolt group, at the beginning of twist, twist tighten order should be in strict accordance with the operation, according to the "m" word symmetry operations.
2. The bolts that have been initially screwed should be marked for confirmation. In order to prevent leakage, the bolts installed on the same day should be screwed finally on the same day.3. Operate in strict accordance with the operating procedures of the electric torque wrench. After each use of the wrench, the wrench must be returned to zero, so as not to cause metal fatigue of the spring.
4. Assuming that the torque or pretightening force of fastening bolts is accurate, but due to external force, temperature change, vibration and other factors, the pretightening force will still change after a period of time, and it still needs to be checked.
