Sharpener

1 . A sharpener, comprising:

a clamping component, which comprises two mirror symmetric clamping arms, wherein a middle of each of the clamping arms is connected together at a first rotating shaft;

a sharpening seat, configured to fix a sharpening stone, a working surface of the sharpening stone is a grinding surface;

a sharpener holder, which is configured to slide back and forth along an axial direction of the sharpening seat, the sharpener holder comprises a horizontal rod perpendicular to the axial direction of the sharpening seat and parallel to the grinding surface;

an arm body, one end of the arm body is sleeved on the horizontal rod and slides axially along the horizontal rod and pitches around the horizontal rod, and the other end of the arm body is fixedly connected at the first rotating shaft, and the first rotating shaft extending through aligned holes of the clamping arms and the second arm segment;

a bearing ring, which is coaxially sleeved outside the arm body and is clearance fit with the arm body, and a connecting ear is provided on an outer circumference of the bearing ring;

four articulated rods arranged symmetrically in two pairs, each of the articulated rods has a first end hinged to the connecting ear, and a second end hinged to a rear end of a respective clamping arm;

a driving component, which is provided on the arm body and configured to push the bearing ring to move axially along the arm body, thereby causing the two clamping arms to synchronously open and close through the symmetrical articulated rods to clamp or release a cutting tool;

wherein the driving component comprises a driving nut and a first thrust bearing.

2 . The sharpener according to claim 1 , wherein the driving nut—is coaxially sleeved on the arm body and forms a threaded engagement structure with an outer circumference of the arm body;

the first thrust bearing is coaxially sleeved on an outer wall of the arm body and is clearance fit with the arm body; the first thrust bearing is disposed between the driving nut and the bearing ring, and a first end face of the first thrust bearing being in contact with the driving nut, and a second end face, which is opposite to the first end face, being in contact with the bearing ring.

3 . The sharpener according to claim 1 , wherein the arm body comprises a first arm segment and a second arm segment that are arranged coaxially;

the sharpener further comprises a rotating sleeve component, and the rotating sleeve component comprises a rotating sleeve;

wherein the rotating sleeve and the first arm segment are in threaded engagement, and is matched with the second arm segment through a rotatable but axially limited connection, so that when the rotating sleeve is rotated, an axial distance between the first arm segment and the second arm segment is changed along the threaded engagement to adjust an effective length of the arm body and fine tune an angle between the cutting tool and the grinding surface.

4 . The sharpener according to claim 1 , wherein the arm body comprises a first arm segment and a second arm segment that is arranged coaxially with the first arm segment;

the sharpener further comprises a rotating sleeve component, and the rotating sleeve component comprises a rotating sleeve;

one end of the rotating sleeve is fixedly connected to the first arm segment, and the other end of the rotating sleeve is rotatably connected to the second arm segment;

when the first arm segment and the second arm segment rotate relative to each other, a total length of the arm body remains unchanged.

5 . The sharpener according to claim 4 , wherein the rotating sleeve is fixedly connected to the first arm segment, and one end of the second arm segment extends into the rotating sleeve and is clearance fit with the rotating sleeve;

the rotating sleeve component further comprises a second thrust bearing and a locking cap, wherein the second thrust bearing is provided inside the rotating sleeve, and two end faces of the second thrust bearing are respectively in contact with end faces of the first arm section and the second arm section;

the locking cap is detachably connected to the rotating sleeve and rotatably connected to the second arm segment to a limit an axial movement between the first arm segment and the second arm segment.

6 . The sharpener according to claim 1 , wherein anti-slip teeth and/or replaceable pads are provided on two opposite side walls of front ends of the two clamping arms.

7 . The sharpener according to claim 1 , wherein the sharpener further comprises a sliding guide component, and the sliding guide component comprises a sliding seat, a plurality of rolling elements, and two guide shafts fixed on the sharpening seat and extending along an axis of the sharpening seat, wherein the rolling elements comprise rollers or bearings;

the rolling elements are divided into two groups, each group corresponds to one guide shaft of the two guide shafts, and each rolling element having at least one annular groove on an outer circumferential surface thereof, the guide shaft of each group being in rolling cooperation with the annular grooves of the corresponding group of rolling elements so as to form a multi-point rolling support between the sliding seat and the guide shafts, thereby guiding the sliding seat to move axially along the sharpening seat; and

the sharpener holder is fixed on the sliding seat.

8 . The sharpener according to claim 7 , wherein the sharpener holder comprises:

two parallel and spaced arranged side brackets, wherein each end of each of the two side brackets is fixedly connected to the sliding seat, each of the two side brackets is both provided with a respective through groove, and the two through grooves are parallel to each other;

two ends of the horizontal rod are respectively in contact with side walls of the two side brackets; and

a locking bolt, which is arranged along an axis of the horizontal rod, and a body of the locking bolt passes through the through grooves and is detachably connected to the horizontal rod;

after connection, a head of the locking bolt presses against side walls of the side brackets.

9 . The sharpener according to claim 7 , wherein the sharpener holder comprises two parallel and spaced arranged side brackets, ends of the two side brackets are connected to the horizontal rod, and the other ends of the side brackets are articulated to the sliding seat;

wherein the sharpener further comprises an angle adjustment component, and the angle adjustment component comprises:

a second rotating shaft, which is configured to be a pivotal axis that connects the side brackets and the sliding seat;

two arc-shaped through grooves, each configured to be a through hole located on each of the side brackets respectively and extending around a circumference of the second rotating shaft;

a threaded hole, which is provided on a side wall of the sliding seat, a centerline of the threaded hole is parallel to a centerline of the second rotating shaft;

a threaded rod, one end of the threaded rod extends into the threaded hole and is connected to threaded hole by threads, and the other end of the threaded rod passes through the one of the two arc-shaped through grooves;

a butterfly nut, which is provided on one side of the side brackets facing away from the sliding seat and connected to the threaded rod by threads;

positioning holes, which are configured to be through holes provided on the side brackets, there are a plurality of positioning holes distributed around the circumference of the second rotating shaft;

a blind hole, which is provided on a side wall of the sliding seat and arranged parallel to the centerline of the second rotating shaft;

an ejector pin, one end of the ejector pin extends into the blind hole and is clearance fit with the blind hole, and the other end of the ejector pin is spherical and extends outside the positioning hole to contact the positioning hole;

a size of one side of the ejector pin outside the blind hole is larger than that of the positioning hole, so that only a part of the ejector pin is embedded in the positioning hole and is clearance fit the positioning hole; and

a spring, wherein one end of the spring in contact with an inner bottom of the blind hole, and the other end thereof in contact with the ejector pin;

wherein when the side brackets rotate around the second rotating shaft, the ejector pin expands and contracts along an axis of the blind hole under an action of a spring force; and

wherein when one end of the ejector pin outside the blind hole is facing the positioning hole, the ejector pin springs in to achieve indexing positioning.

10 . The sharpener according to claim 7 , further comprising:

two second limiting elements, and the two second limiting elements are arranged at intervals along an axis of the sharpener holder;

a first limiting element, which is provided on the sliding seat and between the two second limiting elements;

the first limiting element abuts against any one of the two second limiting elements during a reciprocating stroke to thereby limit a stroke movement and prevent the cutting tool from detaching from the grinding surface of the sharpening stone.

11 . The sharpener according to claim 7 , a cross-section of each of the annular grooves is U-shaped, V-shaped, or arc-shaped.