Back shaver

1. A back shaver, comprising:

a cutter head assembly; and

a handle;

wherein the handle is connected to the cutter head assembly; the cutter head assembly comprises cutter heads, a cutter head frame, and a connecting member; the cutter heads are embedded in a front surface of the cutter head frame, a back surface of the cutter head frame is connected to the connecting member through a rotating shaft; elastic components are disposed on one side, distal from the handle, of the connecting member; sliding blocks are disposed on the back surface of the cutter head frame; when the handle is operated, a first force moment is applied to the cutter head frame through the connecting member, and a free end of each of the elastic components slides along a first end of a corresponding one of the sliding blocks to a second end of the corresponding one of the sliding blocks to generate a second force moment against the first force moment.

2. The back shaver according to claim 1 , wherein each of the sliding blocks is an arc-shaped convex block, and each of the sliding blocks comprises a first arc-shaped portion and a second arc-shaped portion, a first end of the first arc-shaped portion is close to an upper edge of the back surface of the cutter head frame, and a second end of the first arc-shaped portion is in a transitional connection with the second arc-shaped portion.

3. The back shaver according to claim 2 , wherein the second arc-shaped portion is in an arc-shaped structure, and the arc-shaped structure protrudes towards an outer side of the back surface of the cutter head frame.

4. The back shaver according to claim 2 , wherein a number of the sliding blocks is two, and a number of the elastic components corresponding to the sliding blocks is two.

5. The back shaver according to claim 4 , wherein each of the elastic components is an elastic sheet and is in an arc-shaped structure.

6. The back shaver according to claim 1 , wherein limiting grooves are defined on the back surface of the cutter head frame, limiting stop blocks are disposed on the connecting member, and the limiting stop blocks rotate in the limiting grooves, so that a relative rotation angle of the cutter head frame and the connecting member is not greater than 30°.

7. The back shaver according to claim 6 , wherein a number of the limiting grooves is two, and a number of the limiting stop blocks corresponding to the limiting grooves is two.

8. The back shaver according to claim 6 , wherein the limiting grooves and the limiting stop blocks are on the same axis.

9. The back shaver according to claim 1 , wherein a clamping groove is defined on a front end of the handle; a clamping hole is defined on a top of the front end of the handle, the clamping hole is communicated with the clamping groove; an elastic member is disposed at one end, distal from the cutter head frame, of the connecting member; the elastic member is slidably inserted into the clamping groove; a button is disposed on a distal end of the elastic member, and the button is inserted into the clamping hole.

10. The back shaver according to claim 9 , wherein an arc-shaped groove is defined on one side, distal from a front end of the handle, of the clamping hole, and an inclined surface configured to press the button is disposed at one end, close to the arc-shaped groove, of the button.