What are the common misunderstandings when the working stroke of an industrial actuator does not meet the standard?

This is the most typical misunderstanding. When noticing that the push rod cannot rise high enough, the first reaction is that the spring is too tight, and then one tries to compress the brake spring forcefully. Although this can temporarily make the stroke meet the standard, it will significantly increase the braking torque and the release current, causing the motor to overheat and even leading to the brake "locking up" or being unable to release. The correct approach is to first ensure that the compensation mechanism (such as the brake pull rod, balance frame) is adjusted properly, and the spring force should be strictly set according to the nameplate or working conditions.

The stroke of the actuator and the clearance of the brake shoes are interrelated. If only the stroke of the push rod reaching the rated height (stroke meeting the standard) is pursued without checking the gap between the two brake shoes and the brake wheel (clearance), it may result in uneven wear with one side rubbing against the disc and the other side having an excessive gap. Conversely, if only the clearance is adjusted, it may lead to an insufficient stroke. Both must be alternately adjusted until the stroke is appropriate and the clearances on both sides are uniform.

If the air release screw of the hydraulic actuator is not loosened to vent the air after maintenance or oil change during use, the compressible medium in the cylinder will cause a reduction in the stroke. Additionally, using oil without considering the ambient temperature (such as using high-grade oil in winter) will result in thick oil with high resistance, also leading to insufficient start stroke. Corresponding grade hydraulic oil should be selected based on the temperature (for example, using 22-grade hydraulic oil in low temperatures).

As the brake pads wear out, the installation height of the actuator base needs to be raised by adjusting the brake lever to compensate for the stroke. A common mistake is either not adjusting it for a long time, causing the actuator to always work at the shortest stroke, or adjusting it too high at once, resulting in the push rod hitting the upper limit when the load is empty and the brake cannot close normally. Generally, it is recommended to adjust the height of the push rod to about 40% to 60% of the rated stroke when it is static.