Intermittent rotation structure for extension tool, and extension tool

An extension tool, wherein the extension tool comprises an intermittent rotation structure for extension tool, the intermittent rotation structure for extension tool comprises:

• a rotary cam, a roller and an ejector pin, the roller is rotationally disposed at the tail of the ejector pin, the roller is in contact with the circumferential side wall of the rotary cam, the front end of the ejector pin is sleeved with a rotary sleeve, the tail of the ejector pin is sleeved with a guide sleeve, the outer side wall of the ejector pin disposed in the rotary sleeve and the guide sleeve is sleeved with a spring, the ejector pin moves along the direction of a guide groove disposed in the guide sleeve, a rotary gear is disposed on an outer side wall of the rotary sleeve in a transmission manner, a plurality of extending portions are disposed on the end face of the rotary sleeve close to the front end portion of the ejector pin;
• an incomplete gear is disposed on an end face of the rotary cam, a first driven gear is disposed at one side of the incomplete gear in a transmission manner, an extension rod is disposed on the first driven gear, the extension rod extends to the rotary gear and is in transmission connection with the rotary gear by means of a second driven gear;
• and the extension tool further comprises a casing, a fixed sleeve and a conical extension head, the intermittent rotation structure for extension tool is disposed in the casing, an ejector pin and a front end of a rotary sleeve extend from the casing, the fixed sleeve is sleeved on the rotary sleeve and is fixedly connected with the casing, the conical extension head is movably and detachably disposed on the fixed sleeve, the ejector pin is configured to expand the conical extension head.