In drilling operations, requirements for hole sizes vary greatly across different scenarios, and the drill bit hole opener needs to adjust its own structure to meet these needs. When a smaller hole size is required, the blades of the hole opener will be in a retracted state. At this time, the protruding length of the blades is short, and the hole is only slightly enlarged based on the original drill hole. This is suitable for preliminary hole enlargement operations where the requirement for hole size accuracy is not high.
If medium-sized holes are needed for the operation, workers will extend the blades moderately by adjusting the adjusting bolts of the hole opener. During the adjustment process, the hole size must be measured multiple times to ensure that the blades extend evenly in length, preventing irregular hole sizes. This adjustment method is commonly used in wall drilling operations in construction.
When facing processing requirements for larger hole sizes, in addition to adjusting the protruding length of the blades, it is also necessary to replace the blades with suitable models. In large-hole enlargement operations, the blades need to withstand greater cutting force. Therefore, thicker and more wear-resistant blades must be selected. At the same time, it is necessary to check whether the connection parts of the hole opener are firm to prevent safety issues caused by blade detachment during operation.