Repeated use of bolts in the course of the rule

After the bolts are repeatedly used, the tensile strength of the bolts will drop slightly. Only the torque from the new installation meets the skill rules, but the tensile stress of the bolts will be reduced, and the pre-tightening force of the bolts after tightening will also be reduced. Therefore, when installing a rotary motor from a new position, the tightening torque is 30 to 50 Nm larger than the regular value.

The magnitude of the frictional force between the three-dimensional joints depends not only on the magnitude of the forces between the three-dimensional forces but also on the coefficient of friction and contact area between the three-dimensional forces. Because of the presence of the joint solid oil and debris, the coefficient of friction between the solids will be reduced and the contact area will be reduced, so that the frictional force between the solids after fastening will be reduced, causing the rotary motor to loosen.

The positioning pin between the slewing motor and the forward rotation platform not only functions as a positioning, but also has an interference fit between the positioning pin and the hole, which increases the starting resistance of the slewing motor when the slewing platform is loosened to a large extent, thereby adding a slewing motor. Loose ability. As a result, when the positioning pin looses sight, it will incur a loosening of the rotary motor.

If the rotary motor of the invention is loosened, the cause of the loosening should be found out and then handled in a corresponding manner. It is not possible to use only the method of refastening the bolt.

During the tightening process close to the regular torque, the nut and the screw are subjected to a large force in the axial direction. Although its appearance has a high degree of brightness, it can also be worn out due to tightening to form threads, and the appearance of light is damaged, and sometimes glitches emerge. Therefore, it is necessary to remove the burrs of the threads before installing the slewing motor, and apply a little smooth oil between the threads, nuts or bolts and the three-dimensional contact of the slewing motor so as to aggravate the friction between the threads due to the axial force. Big. As long as this is done, the ability to compare the real and correct reflection of the torque used when tightening. When bolts or screws need to be replaced with new ones, it is necessary to understand the mechanical strength of the original. Roller break

Different times, different industries, different social needs, in our country's rapid economic development, the demand for equipment is more pressing than ever, these requirements make the production of cement production equipment, flotation machine manufacturers and other equipment into the peak period. Recommended Products:

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