The use of pin positioning of the two parts, if disassembled to be reset, in the original pin hole on the good positioning pin can be. For example, the use of horizontal center part of the structure of the blower, its housing and wall panels are divided into upper and lower two parts, to be disassembled during the inspection, assembly and reset. Reset, first in the upper and lower combined surface between the insertion of positioning pins, and then in screwing the coupling bolt.

However, if the relative position of the two parts changes during assembly, it is necessary to reassemble the locating pin. For example, after adjusting the clearance between the two impellers, the relative position of the gear hub of the driven gear ring may change, at which time the holes should be re-drilled, reamed and fitted with locating pins between the gear ring and the gear hub.

When reaming an alignment hole, use the depth of the taper pin hole. If the hole is reamed too large, the small end of the taper pin will have a long section of the pin hole exposed and not involved in contact. A pin that does not make good contact will be easily loosened by vibration. When installing the pin, if there is a foreign object left in the pin hole, or if the pin holes on the two parts are not concentric, it shall not be forcibly hammered in, otherwise the positioning quality will be affected.

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