Corer and method using same

1. A corer, comprising:

a connecting sleeve;

a power lever connected to the connecting sleeve;

a hook cylinder having an upper end inserted into the connecting sleeve; and

a cutting hook connected to a side of the hook cylinder;

wherein a full-length opening is vertically formed on a side wall of the hook cylinder; an upper end of the hook cylinder is detachably connected to the connecting sleeve, and an arc slot perpendicular to the full-length opening is provided on a side of a lower end of the hook cylinder; and a plurality of teeth are arranged on a lower end surface of the hook cylinder along a circumferential direction;

a cross section of the hook cylinder at both sides of the opening on the side wall is an arc surface; the cross section of the hook cylinder is fitted with a circular cross section of a connecting rod of the cutting hook; a radian of the cross section of the hook cylinder is consistent with a radian of an arc of an outer wall of the connecting rod of the cutting hook;

the connecting sleeve is a funnel-shaped cylinder which comprises a cylindrical upper portion, a conical connecting portion and a cylindrical lower portion;

a set of clamping slots are provided on an inner side surface, corresponding to an opening of the hook cylinder, of an upper portion of the connecting sleeve; the clamping slots are configured to clamp a handle of the cutting hook; an included angle between the clamping slots is 10-25 degrees; and

a pair of bolt holes is symmetrically provided on a side wall of the upper portion of the connecting sleeve; a plurality of bolts for rotating the connecting sleeve are arranged in the bolt holes.

2. The corer of claim 1 , wherein adjacent teeth on the hook cylinder are staggered.

3. The corer of claim 1 , wherein the upper end of the hook cylinder is inserted into a lower portion of the connecting sleeve and fastened through a fastener; and a plurality of through holes spaced apart are arranged on an upper opening of the hook cylinder along a circumferential direction and penetrate through the fastener.

4. The corer of claim 1 , wherein the cutting hook comprises:

the handle clamped in the connecting sleeve;

the connecting rod passing through the connecting sleeve and the full-length opening on the side wall of the hook cylinder; and

a tip clamped in the arc slot on the lower end of the hook cylinder;

a tip body of the tip is an arc; an end portion of the tip is a barb-shaped cutting edge; a bending radian of the tip body is consistent with the radian of the arc slot.

5. The corer of claim 4 , wherein tangent of a joint between the tip body of the cutting hook and the connecting rod is perpendicular to the handle.

6. The corer of claim 1 , wherein a plurality of connecting holes spaced apart are horizontally arranged on a lower portion of the connecting sleeve along a circumferential direction and penetrate through a fastener;

a through slot passing through the cutting hook is vertically provided on the side wall of the lower portion, corresponding to the opening of the hook cylinder;

an annular slot is provided at a lower opening of the lower portion of the connecting sleeve along a circumferential direction; the hook cylinder is inserted into the annular slot; a width of the annular slot is adapted to a wall thickness of the hook cylinder; and

a middle of the lower portion of the connecting sleeve is in a threaded connection with a power lever.