Hole chamfering device

A hole chamfering device comprising a first blade group, a second blade group and a blade distance adjusting assembly, wherein

• the first blade group and the second blade group are in bilateral symmetry,
• each of the first blade group and the second blade group comprises a first cutting edge inclined from outside to inside from top to bottom and a second cutting edge inclined from inside to outside from top to bottom;
• the blade distance adjusting assembly comprises a first guide rail, a second guide rail, a first sliding block, a second sliding block, a spring and a V-shaped block, the first guide rail and the second guide rail are in bilateral symmetry, the first sliding block is mounted on the first guide rail, the second sliding block is mounted on the second guide rail, and the first sliding block and the second sliding block are connected with each other through the spring;
• the first blade group is mounted on the first sliding block, and the second blade group is mounted on the second sliding block;
• the V-shaped block is positioned between the first sliding block and the second sliding block, and two sides of the V-shaped block are respectively matched with the first sliding block and the second sliding block in a wedge-shaped mode;
• the blade distance adjusting assembly further comprises a flange plate, a sleeve, a first pull rod, a second pull rod, a first sliding bead, a second sliding bead, a screw and a nut plate,
• the first guide rail and the second guide rail are mounted on a bottom face of the flange plate, and the sleeve is fixedly mounted on a top face of the flange plate;
• a threaded hole is formed in the middle of the nut plate, the screw is arranged in the threaded hole, and external threads of the screw are matched with internal threads of the threaded hole;
• a lower end of the screw is fixed on the sleeve;
• and
• a circle of annular slideway is arranged on a bottom face of the nut plate around the threaded hole, the first sliding bead and the second sliding bead are embedded in the annular slideway, the first sliding bead is fixedly connected with the first pull rod, the second sliding bead is fixedly connected with the second pull rod, two round holes are formed in the sleeve, and the first pull rod and the second pull rod pass through the round holes and a center hole of the flange plate, and are jointly connected to the V-shaped block.