CN111660215A

CN111660215A - Knife sharpening method and knife sharpening device

Info

Publication number: CN111660215A
Application number: CN202010567133.2A
Authority: CN
Inventors: 袁海东; 吕洪文
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-06-19
Filing date: 2020-06-19
Publication date: 2020-09-15
Anticipated expiration: 2040-06-19
Also published as: CN111660215B

Abstract

The invention discloses a knife sharpening method, which specifically comprises the following steps: 1) a knife stone is positioned and installed at the knife grinding frame; 2) selecting a tool rack for fixing tools according to the types of the tools, and mounting the tools on the tool rack; 3) and (3) mounting the tool rack provided with the tool on the rack body positioned above the knife stone, and after the blade part of the tool is contacted with the knife stone, reciprocating the rack body so as to grind the blade part of the tool. The structure of the grinding tool is that the corresponding tool is fixed on the frame body, and the contact degree of the blade part of the tool and the knife stone is further adjusted and fixed, so that the blade part of the tool can be ground only by reciprocating and translating the frame body, the contact force of the blade part and the knife stone for collision is not required to be manually exerted, the tool is more labor-saving in grinding, and the grinding effect is better; meanwhile, different tool holders can be replaced based on different tools, so that the tool holder is suitable for grinding operation of different tools.

Description

Knife sharpening method and knife sharpening device

Technical Field

The invention relates to the technical field of sharpness grinding of a cutting edge of a cutter, in particular to a cutter grinding method and a cutter grinding device.

Background

In the conventional technology, the edge part of the cutter is ground by a handheld cutter, then the edge part of the cutter is contacted with a knife stone, and the cutter is pushed by hands in a reciprocating manner, so that the edge part of the cutter is rubbed with the knife stone, and the edge part of the cutter is ground, however, the mode is labor-consuming, and the grinding effect is not ideal.

Disclosure of Invention

The invention aims to provide a knife sharpening method and a knife sharpening device for solving the technical defects.

The invention designs a knife sharpening method, which specifically comprises the following steps:

1) a knife stone is positioned and installed at the knife grinding frame;

2) selecting a tool rack for fixing tools according to the types of the tools, and mounting the tools on the tool rack;

3) and (3) mounting the tool rack provided with the tool on the rack body positioned above the knife stone, and after the blade part of the tool is contacted with the knife stone, reciprocating the rack body so as to grind the blade part of the tool.

Preferably, the frame body is reciprocally translated in a longitudinal linear direction of the grinder frame.

A knife sharpening device, comprising:

the knife grinding frame is used for positioning and fixing a knife grinding stone;

the frame body is movably arranged on the knife grinding frame and can be translated in a reciprocating manner along the length linear direction of the knife grinding frame;

the cutter frame is positioned and arranged on the frame body and is used for mounting a cutter;

after the blade part of the cutter is contacted with the knife stone, the frame body moves in a reciprocating manner so as to grind the blade part of the cutter.

Preferably, the sharpening frame comprises a placing frame and a positioning frame for positioning and fixing the sharpening stone, the positioning frame is fixed on the placing frame, slide rails are arranged on two sides of the placing frame in the length direction, slide grooves are respectively arranged on two corresponding sides of the bottom surface of the frame body, and the slide rails are correspondingly embedded into the slide grooves, or

The knife sharpening frame comprises a placing frame and a positioning frame for positioning and fixing the knife sharpening stone, the positioning frame is fixed on the placing frame, guide rods are arranged on two sides of the placing frame in the length direction, guide sleeves are arranged on two corresponding sides of the bottom surface of the frame body respectively, and the guide sleeves are sleeved on the guide rods correspondingly.

Preferably, the angle adjusting and positioning device is used for adjusting the grinding angle of the blade part of the cutter, the angle adjusting and positioning device is used for adjusting and positioning the extension length of the front end part of the cutter according to the preset extension length, and further adjusting the angle between the cutter frame and the knife grinder during grinding so as to adjust and control the grinding angle of the blade part.

As preferred, the support body that has the spout includes the dead lever and two plate bodys that just correspond the setting each other at an interval, and the bottom mounting of plate body has the installation piece, is provided with the spout on the installation piece, and the both ends of dead lever are fixed with the top of two plate bodys respectively and are linked to each other.

Preferably, the frame body with the guide sleeve comprises at least one fixed rod and two plate bodies which are spaced from each other and are arranged correspondingly, the guide sleeve is fixed at the bottom end of each plate body, and the two ends of each fixed rod are fixedly connected with the top ends of the two plate bodies respectively.

Preferably, a tool holder for holding a tool is mounted on the holding lever, and the tool holder is selected according to the kind of tool.

Preferably, two end faces of the fixing rod respectively abut against the inner side faces of the two plate bodies, threaded holes corresponding to the positions of the fixing holes are formed in the two end faces of the fixing rod, compression bolts are connected in the threaded holes in a threaded mode, and the side faces of the bolt heads of the compression bolts abut against the outer side faces of the plate bodies to install the fixing rod.

Preferably, the positioning frame comprises fixed blocks fixed at two ends of the placing frame, a movable block is arranged between the two fixed blocks, a threaded hole is formed in one fixed block, a screw rod is connected with the threaded hole in an internal thread mode, the inner side end of the screw rod is fixedly connected with the movable block, and the knife stone is pressed and fixed between the movable block and the other fixed block.

Preferably, the bottom surface of guide bar or rack is provided with the stopper, and the stopper obtains fixing after carrying out displacement adjustment along the length direction of guide bar or rack to carry out spacingly to the displacement of support body.

According to the knife sharpening method and the knife sharpening device, the corresponding knife is fixed on the frame body, the contact degree of the knife edge part of the knife and the knife sharpening stone is further adjusted and fixed, and the knife edge part of the knife can be ground only by translating the frame body in a reciprocating manner, so that the contact force of the knife edge part and the knife sharpening stone for collision is not required to be applied manually, the knife is more labor-saving in grinding, and the grinding effect is better; meanwhile, different tool holders can be replaced based on different tools, so that the tool holder is suitable for grinding operation of different tools.

Drawings

FIG. 1 is a schematic view of a frame structure of embodiment 1;

FIG. 2 is a schematic view (one) of the structure of the frame with the woodworking planer tool clamp of embodiment 1;

fig. 3 is a schematic view (two) of the structure of the frame with the woodworking planer tool clamp of embodiment 1;

FIG. 4 is a schematic view showing the structure of a housing with a woodworking turning tool or a round chisel fixture of embodiment 1;

FIG. 5 is a schematic view showing the structure of a housing with a short blade or scissors clamp according to example 1;

FIG. 6 is a schematic view showing the structure of a housing with a long knife or a kitchen knife holder according to embodiment 1;

FIG. 7 is a schematic view of the structure of the frame with the axe clamp of embodiment 1;

FIG. 8 is a schematic view of a structure of a frame with a table of embodiment 1;

fig. 9 is a schematic structural view of a frame with an oilstone dresser clamp of embodiment 1;

FIG. 10 is a schematic view (one) of the structure of the frame with the angle-adjusting positioner of embodiment 1;

fig. 11 is a schematic structural view (one) of the frame with the angle-adjusting positioner of embodiment 1.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.

Example 1:

as shown in fig. 1-11.

The knife sharpening method described in this embodiment specifically includes the following steps:

1) a knife stone 2 is positioned and installed at the knife grinding frame 1;

3) mounting a tool holder provided with a tool on a holder body 3 positioned above a whetstone, and after a blade part of the tool is contacted with the whetstone 2, reciprocating the holder body 3 to grind the blade part of the tool; preferably, the frame body is reciprocally translated in a lengthwise linear direction of the sharpening frame.

The tool types can be a woodworking plane edge 6, a woodworking turning tool or round chisel 7, a short tool or scissors 8, an axe 14, an oilstone finishing slurry outlet 15, a long tool or kitchen knife 9 and the like, so that a straight blade clamp for mounting the woodworking plane edge 6, a turning tool clamp for mounting the woodworking turning tool or round chisel 7, a short tool or scissors clamp for mounting the short tool or scissors 8, an axe clamp for mounting the axe 14, a long tool or kitchen knife clamp and an oilstone finishing slurry outlet clamp are correspondingly obtained according to the tools of the types.

In addition, a knife sharpening device obtained based on the method comprises: the knife sharpening frame 1 is used for positioning and fixing a knife sharpening stone 2; the frame body 3 is movably arranged on the knife grinding frame 1 and can be translated in a reciprocating manner along the length direction of the knife grinding frame 1; the cutter frame is positioned and arranged on the frame body 3 and is used for installing cutters; further, the sharpening frame 1 comprises a placing frame 11 and a positioning frame 12 for positioning and fixing the sharpening stone 2, the positioning frame 12 is fixed on the placing frame 11, guide rods 4 are arranged on two sides of the placing frame 11 in the length direction, guide sleeves 34 are respectively arranged on two corresponding sides of the bottom surface of the frame body 3, and the guide sleeves 34 are correspondingly sleeved on the guide rods 4; the frame body 3 with the guide sleeve 34 comprises at least one fixed rod 32 and two plate bodies 31 which are spaced from each other and are arranged correspondingly, the guide sleeve 34 is fixed at the bottom end of each plate body 31 through a bolt, and two ends of each fixed rod 32 are fixedly connected with the top ends of the two plate bodies 32 respectively; a tool holder for holding a tool is fixed to the fixing rod 32, and the tool holder is selected according to the kind of tool.

After the blade part of the cutter contacts the knife stone 2, the frame body 3 is pushed to move back and forth so as to grind the blade part of the cutter, and when the blade part of the cutter moves back and forth, the guide sleeve 34 moves back and forth under the guide action of the guide rod 4.

Tool holder configurations were chosen for different kinds of tools: when the cutter is the woodworking planer tool 6, the cutter frame structure of the woodworking planer tool adopts a straight edge clamp which comprises a positioning block 64, a 20866, a fixture 61, a clamp plate 62 and two fastening bolts 63, wherein the clamp plate 62 is positioned below the bottom surface of a transverse plate of the fixture 61, screws of the two fastening bolts 63 respectively penetrate through the 20866, through holes at two ends of the transverse plate of the fixture are in threaded connection with threaded holes at two ends of the clamp plate, then the two fastening bolts 63 are simultaneously rotated to enable the woodworking planer tool 6 to be fixed between the clamp plate 62 and the 20866, between the transverse plates of the fixture 61, and meanwhile, a positioning block 64 (the fixing rod is sunk into a recess of the positioning block to be positioned) is placed on the sharpening stone 2 or fixed on the fixing rod 32 (the positioning block is sleeved on the fixing rod by an inner hole and then is in threaded connection with the threaded hole on the positioning block by a set screw, and the screw end part of the set screw is abutted against, the top end of the positioning block 64 is abutted against the bottom surface of the clamping plate 62, so that a 20866a combined structure of the fixture 61 and the clamping plate 62 is positioned, 20866a U-shaped hole is formed in the bottom end of the longitudinal part of the fixture, and the fixing rod is inserted into the U-shaped hole; further, based on the woodworking planer tool 6, the woodworking planer tool further comprises an angle adjusting positioner 600 for adjusting the grinding angle of the blade part of the tool, the angle adjusting positioner 600 controls and adjusts the extension length of the front end part L of the tool, and further adjusts the angle a between the tool holder 11 and the grinding stone 2 during grinding, so that the grinding angle of the blade part is adjusted and controlled, wherein the angle adjusting positioner comprises an adjusting plate 601 with size scales and an adjusting slider 603, a guide sliding rod 602 is arranged at the side part of the adjusting plate 601, a guide sliding sleeve 605 at the end part of the adjusting slider is sleeved on the guide sliding rod 602, a bolt 604 is connected with a threaded hole in the guide sliding block 603 in a threaded manner, when the adjusting slider moves to a proper size scale position under the matching of the guide sliding rod 602 and the guide sliding sleeve 605, so as to complete and determine the extension length of the front end part L of the tool, the bolt is rotated, so that the screw rod of the, the adjusting slide block is positioned and fixed, the extending length of the front end part L of the cutter is adjusted and then is positioned and controlled, and the adjusting slide block is suitable for grinding operation of different cutting edge part grinding angles.

When the cutter is a woodworking turning tool or a round chisel 7, the tool rest structure of the woodworking turning tool or the round chisel fixture is a woodworking turning tool or a round chisel fixture, the woodworking turning tool or the round chisel fixture comprises a fixing block 10, a connecting piece 72, a hexagonal bolt 75, a nut 73 and a cutter fixing sleeve 74, a mounting plate 741 is arranged on the cutter fixing sleeve 74, a fixing column 721 on the connecting piece 72 is inserted into a through hole 200 of the fixing block 10 for fixing (fixed in an interference fit manner or fixed through a set screw), the mounting plate 741 is arranged on one end face of a connecting sleeve 72 on the connecting piece 72, a hexagonal groove 742 is arranged on the mounting plate 741, through holes with corresponding positions are arranged on the bottom face of the hexagonal groove and the mounting plate, a screw of the hexagonal bolt 75 correspondingly penetrates through the through hole and then is in threaded connection with the nut 73 for fixing, a bolt head of the hexagonal bolt 75 is, the angle of the tool fixing sleeve 74 can be adjusted by loosening the connection between the nut and the hexagon bolt 75, the tool body of the woodworking lathe tool or the round chisel 7 is inserted into the tool fixing sleeve 74, and the screw end of the fastening bolt screwed on the tool fixing sleeve tightly presses the tool body of the tool, so that the tool is installed and fixed, the fixing block 10 is provided with a through hole 200 and a gap 300 communicated with the through hole 200, the fixing block is divided into a front clamping block 712 and a rear clamping block 713 through the gap 300, and the front clamping block 712 and the rear clamping block 713 are fixedly connected through the bolt, so that a fixing rod is clamped and fixed on the fixing block.

When the cutter is a short cutter or a pair of scissors 8, the cutter frame structure of the cutter is a short cutter or a pair of scissors clamp, the short cutter or the pair of scissors clamp comprises a fixed block 10, a fixed clamping plate 81 and a movable clamping plate 82, a through hole 200 and a gap 300 communicated with the through hole 200 are arranged on the fixed block 10, the fixed block 10 is divided into a left clamping block 831 and a right clamping block 832 through the gap 300, the left clamping block 831 and the right clamping block 832 are fixedly connected through a bolt 100, so that the fixed block 10 is fixed on a cylinder 811 of the fixed clamping plate 81, the back of the short cutter or the pair of scissors 8 is clamped between the fixed clamping plate and the movable clamping plate, the fixed clamping plate and the movable clamping plate are fixed together through the bolt to install the cutter, the fixed rod is arranged in another through hole 200 on the fixed block 10, and then.

When the cutter is the axe 14, the cutter frame structure of the axe adopts an axe clamp, the axe clamp comprises a fixed plate 141, a pressing plate 142 and two puller bolts 144, the pressing plate is positioned on the bottom surface of the fixed plate, the pressing plate is provided with two elongated holes 143, the bottom surface of the fixed plate is provided with two threaded through holes respectively corresponding to the two elongated holes, the screw rods of the puller bolts penetrate through the elongated holes and are in threaded connection with the threaded through holes, the end part of the pressing plate is provided with an inclined plate 145, the end of the inclined plate 145 is provided with a pressing plate 148, when the end part of the axe is positioned between the pressing plate and the fixed plate, the puller bolts are screwed, and the end parts of the screw rods of the puller bolts push the head of the axe upwards, so that the head part of the axe is pressed and fixed between the pressing plate and the end parts of the screw rods of the puller bolts, wherein two fixed rods arranged in parallel to each other are, the other fixed rod is abutted against the middle part of the fixed plate so as to enable the fixed plate to realize the arrangement of the inclined state.

When the cutter is a long knife or a kitchen knife 9, the cutter frame structure of the cutter adopts a long knife or kitchen knife clamp which comprises a fixed block 10, two support rods 92 and two cutter clamping blocks 91, wherein the two support rods 92 are parallel to each other and are arranged at intervals, and the end parts of the two support rods 92 are fixedly connected through a connecting block 93; the front end and the rear end of the two cutter clamping blocks 91 are respectively provided with a clamping opening 911 and a connecting part, the knife backs of long knives or kitchen knives are arranged in the clamping opening 911 of the cutter clamping block 91, a bolt 100 is screwed in a threaded through hole on the clamping opening 911, the screw end part of the bolt 100 is abutted against the knife backs to compress and fix the knife backs, the connecting part is provided with a through hole 200 and a gap 300 communicated with the through hole 200, the front side supporting rod 92 is arranged in the through hole 200 and then is divided into an upper clamping block 400 and a lower clamping block 500 through the gap 300, and the upper clamping block and the lower clamping block are fixedly connected through the bolt, so that the front side supporting rod 92 clamps and fixes the two cutter clamping blocks 91; the front end of fixed block 10 is provided with through-hole 200, back side vaulting pole 92 makes fixed block and back side vaulting pole fixed continuous through tightly deciding the bolt after arranging in through-hole 200 in, the rear end of fixed block 10 is provided with through-hole 200 and the gap 300 that communicates with through-hole 200, then also divide into clamp splice 400 and clamp splice 500 down through gap 300, it fixes continuously through the bolt with clamp splice 500 down to go up clamp splice 400, make and carry out the fastening on the back side vaulting pole 92 and decide fixed block 91, thereby based on the above-mentioned usable elasticity tight bolt of deciding the rotation angle regulation location that realizes fixed block and cutter clamp splice.

The fixed rod can fix the workpiece table 13, the workpiece table 13 comprises a fixed sleeve 132 and a platen 131 positioned on the front side of the fixed sleeve 132, a plurality of pressing blocks 132 are arranged on the front side of the platen 131, the pressing blocks 132 are connected to the front side face of the platen through bolts, small blades or thin-sheet objects (polishing parts made of DIY) and the like are tightly pressed between the platen and the pressing blocks, and the blade parts of the small blades are in contact with a whetstone to perform grinding operation.

The cutter is a slurry finishing device 15 for oilstones, a cutter frame structure of the slurry finishing device adopts an oilstone finishing device clamp, the slurry finishing device clamp for oilstones comprises two fixing blocks 10, the rear ends of the fixing blocks 10 are provided with through holes 200, fixing rods 32 are arranged in the through holes 200 and then fastened and fixed through bolts 200, the front ends of the fixing blocks 10 are provided with the through holes 200 and gaps 300 communicated with the through holes 200, the fixing blocks are divided into upper clamping blocks 400 and lower clamping blocks 500 through the gaps 300, connecting columns at the two ends of the slurry finishing device for oilstones are arranged in the through holes, the upper clamping blocks and the lower clamping blocks are fixedly connected through bolts to clamp and fix the two ends of the slurry finishing device for oilstones, wherein the height of the fixing rods needs to be adjusted to the highest point, the two ends of the fixing rods are respectively fixed at the highest point position of the top end of a plate body, and the oilstone finishing device can be.

In this embodiment, the top of two plate bodies 31 all is provided with the fixed orifices that the position corresponds each other a plurality of, and two plate body medial surfaces are contradicted respectively to dead lever 32 both ends face, and the both ends face of dead lever is provided with the screw hole that corresponds with the fixed orifices position, and threaded hole female connection clamp bolt, clamp bolt's bolt head side is contradicted with plate body lateral surface to installation dead lever 32.

The top of the plate 31 has a plurality of fixing holes which can be a U-shaped hole 311 and two round holes 32 behind the U-shaped hole 311, when a long knife or a kitchen knife clamp, a short knife or a scissors clamp, a straight blade clamp, a woodworking lathe tool or a round chisel clamp, or a workbench is needed, the two end steps of only one fixing rod are abutted against the inner side surface of the plate, the two end surfaces of the fixing rod are provided with threaded holes, the screw rod of the pressing bolt 33 penetrates through the U-shaped hole to be in threaded connection with the threaded holes, and the side surface of the bolt head of the pressing bolt 33 is abutted against the outer side surface of the plate 31 to install the fixing rod 32; when the axe clamp needs to be adopted, two fixing rods 32 need to be adopted, steps at two ends of one fixing rod 32 are abutted against the inner side face of the plate body, threaded holes are formed in two end faces of the fixing rod, a screw rod of a compression bolt 33 penetrates through a round hole 312 to be in threaded connection with the threaded holes, the side face of a bolt head of the compression bolt 33 is abutted against the outer side face of the plate body 31 to install one fixing rod 32, two end faces of the other fixing rod 32 are respectively abutted against the inner side faces of the two plate bodies 31, threaded holes corresponding to the positions of the fixing holes are formed in two end faces of the other fixing rod 32, the compression bolt is in threaded connection with the threaded holes, and the; and the two fixing rods 32 are fixed and then arranged in parallel; when the oilstone trimmer is adopted, only one end of the fixing rod 32 is located between the top circular holes 312 of the two plate bodies 33, and the compression bolt penetrates through the top circular holes and then is in threaded connection with the threaded hole, so that the fixing rod is installed and fixed.

In this embodiment, the positioning frame 12 includes fixed blocks 121 fixed at both ends of the placing frame 11, a movable block 122 is disposed between the two fixed blocks 121, a threaded hole 126 is disposed on one fixed block 121, a screw 123 is connected to the threaded hole 126 via an internal thread, the inner end of the screw 123 is fixedly connected to the movable block 122, the whetstone 2 is pressed and fixed between the movable block 122 and the other fixed block 121, the structure can rotate the screw according to the length of the whetstone, the screw 123 displaces under the action of the threaded hole 126 to displace the movable block, so as to enlarge the distance between the movable block and the fixed block, then the whetstone is placed between the movable block and the fixed block, and then the screw is rotated reversely to displace the movable block towards the end of the whetstone, after the movable block presses the end face of the whetstone, the whetstone is fixed, thereby further realizing the effect of fixing and mounting the whetstones with different lengths, meanwhile, a guide rod 126 is fixed on the movable block and penetrates through a guide hole 125 in the fixed block to play a role in guiding the displacement of the movable block, so that the movable block is stable and reliable in displacement.

In this embodiment, the bottom surface of guide bar 4 or rack 11 is provided with stopper 5, and stopper 11 carries out the displacement along the length direction of guide bar 4 or rack 11 and obtains fixing to carry out spacingly to the displacement of support body 3. Wherein be provided with centre gripping hole 51 on the stopper 5 and with the gap 52 of centre gripping hole 52 intercommunication, form two grip blocks 54 through gap 52, the guide bar is arranged in behind the centre gripping hole 51, two grip blocks 54 are fixed continuous back through sticising bolt 53, make two grip blocks 54 merge each other and compress tightly, in order to fix the stopper on the guide bar, thereby the elasticity sticiss the bolt and can realize carrying out position control back location to the stopper, can carry out the displacement according to cutter length and adjust the stopper, in order to adapt to the cutting edge portion of placing the cutter and hit on the fixed block or directly shift out the whetstone.

Based on the above, the embodiment of the structure cooperation mode when another kind of support body slides on the rack, knife rest 1 includes rack 11, and be used for fixing the locating rack 12 of whetstone in location, locating rack 12 is fixed in on rack 11, and the both sides portion of length direction all is provided with the slide rail on rack 11, the corresponding both sides in bottom surface of support body are provided with the spout respectively, and the slide rail corresponds to imbed in the spout, support body 3 that has the spout includes dead lever 32, and two plate body 31 that keep apart each other and correspond the setting, there is installation piece 34 in the bottom of plate body through the bolt fastening, be provided with the spout on installation piece 34, the both ends of dead lever 32 link to each other with the top stationary phase of two plate body 31 respectively.

The present invention is not limited to the above-mentioned preferred embodiments, and any other products in various forms can be obtained by anyone in the light of the present invention, but any changes in the shape or structure thereof, which have the same or similar technical solutions as those of the present application, fall within the protection scope of the present invention.

Claims

1. The knife sharpening method is characterized by comprising the following steps:

1) a knife stone is positioned and installed at the knife grinding frame;

2. The method of sharpening a knife according to claim 1, wherein the carriage translates back and forth in a linear direction of the length of the sharpener holder.

3. A knife sharpening device, comprising:

4. The knife sharpening device according to claim 3, wherein the knife sharpening frame comprises a placing frame and a positioning frame for positioning and fixing the sharpening stone, the positioning frame is fixed on the placing frame, slide rails are arranged on two sides of the placing frame in the length direction, slide grooves are respectively arranged on two corresponding sides of the bottom surface of the frame body, and the slide rails are correspondingly embedded into the slide grooves, or

5. The knife sharpening device according to claim 3, further comprising an angle adjusting positioner for adjusting a grinding angle of the blade portion of the knife, wherein the angle adjusting positioner adjusts and positions the protrusion length of the front end portion of the knife according to a preset protrusion length, and further adjusts an angle between the knife holder and the knife stone during grinding, so that the angle at which the blade portion is ground is adjusted and controlled.

6. The knife sharpening device according to claim 4, wherein the frame body with the guiding sleeve comprises at least one fixing rod and two plate bodies which are spaced from each other and arranged correspondingly, the guiding sleeve is fixed at the bottom end of the plate bodies, and the two ends of the fixing rod are respectively fixedly connected with the top ends of the two plate bodies.

7. The device for sharpening knives according to claim 5 or 6, characterized in that the fixed rod is mounted with a knife holder for fixing the knives, the knife holder being selected according to the kind of the knives.

8. The knife sharpening device according to claim 7, characterized in that two end faces of the fixing rod respectively abut against inner side faces of the two plate bodies, the two end faces of the fixing rod are provided with threaded holes corresponding to the positions of the fixing holes, the threaded holes are internally threaded with compression bolts, and side faces of bolt heads of the compression bolts abut against outer side faces of the plate bodies to mount the fixing rod.

9. The knife sharpening device according to claim 8, wherein the positioning frame comprises fixed blocks fixed at two ends of the placing frame, a movable block is arranged between the two fixed blocks, a threaded hole is arranged on one fixed block, a screw rod is connected with the threaded hole in a threaded manner, the inner side end of the screw rod is fixedly connected with the movable block, and the knife sharpening stone is tightly pressed and fixed between the movable block and the other fixed block.

10. The knife sharpening device according to claim 6, characterized in that a limiting block is arranged on the bottom surface of the guide rod or the placing rack, and the limiting block is fixed after displacement adjustment along the length direction of the guide rod or the placing rack so as to limit the displacement of the rack body.