Saw blade quick-change structure for electric tools, and saw blade quick-change method

A saw blade quick-change structure for electric tools, comprising a locking mechanism, a head shell, a tool rest and a quick-change buckle, the locking mechanism being installed in the head shell and used for fixing or releasing a saw blade, the tool rest being installed at a bottom of the head shell, the quick-change buckle being hinged to the head shell and used for controlling the locking mechanism to lock or release the saw blade, wherein the locking mechanism comprises a movable rod, a locking rod, a collet chuck, a locking block, a stop collar and a return spring;

• a cross-section of the movable rod is in an inverted Y shape, a cavity for receiving the collet chuck is formed in a lower portion of the movable rod, an upper portion of the collet chuck is located in the cavity, a clamping portion of the collet chuck faces downwards, an inner diameter of a lower portion of the cavity increases gradually from top to bottom, an upper surface of the collet chuck does not contact a top surface of the cavity, a locking head is disposed above the locking rod, a maximum diameter of the locking head is greater than a diameter of the locking rod below the locking head, and the locking head is located in the clamping portion of the collet chuck and is in contact with the clamping portion of the collet chuck;
• the locking block is located below the movable rod, a through hole is formed in a middle of the locking block, the locking block has an upper portion with a large inner diameter and a lower portion with a small inner diameter, an inclined slope is formed between the upper portion with the large inner diameter and the lower portion with the small inner diameter of the locking block, an outer side of the clamping portion of the collet chuck is in close contact with the inclined slope, and a central axis of the locking block is coaxial with a central axis of the movable rod;
• the stop collar is disposed around the locking rod, a position of an upper end of the stop collar corresponds to a position of a lower end of the clamping portion of the collet chuck in an up-down direction;
• and the return spring is in contact with the locking block and is used for returning the locking block.