Knife sharpening machine and method of using the same

Abstract

The present invention relates to the technical field of numerical control machinery, and discloses a sharpening machine and a method for using the same, comprising: a base, which is rectangular in shape; a knife clamping structure, which is arranged on the top of the base and is used to fix a knife blade that needs to be sharpened and ground, the knife clamping structure comprising an extension groove, a damping spring rod, a base plate and a pressure plate, the extension groove is opened on the top of the front wall of the base, the damping spring rod is fixedly connected in the extension groove, the base plate is fixedly connected to the front end of the damping spring rod, the pressure plate is movably connected to the top of the base plate, the top of the base plate can be flush with the top of the fixing rod, the pressure plate can fix the knife blade on the top of the plug column, and by setting the knife clamping structure, blades of different thicknesses and widths can be fixed and ground, and the knife clamping structure can adapt to different blades and fix them through the base plate and the pressure plate that can be displaced along the top of the base, so that the present solution has a large scope of application.

Description

Technical Field

[0001] The invention belongs to the technical field of numerical control machinery, and in particular relates to a knife sharpening machine and a use method thereof. Background Art

[0002] A knife sharpener is a device used to sharpen and sharpen knives. It is widely used in the maintenance and repair of various knives, such as kitchen knives, scissors, woodworking knives, metal cutting tools, etc.

[0003] The commonly used sharpening machine fixes the blade to be sharpened on the device and then sharpens the blade by rotating the grinding wheel. However, the commonly used sharpening machine cannot adjust to fit the size of the blade when fixing the blade, so there is an urgent need for a sharpening machine that can adapt to the grinding of blades of different sizes.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] In order to solve the technical problem that the conventional knife sharpener cannot arbitrarily adjust the size of the blade, the basic concept of the technical solution adopted by the present invention is:

[0006] A knife sharpening machine comprises: a base, the base is rectangular, a grinding motor is arranged on the top of the base, an upper grinding wheel is arranged below the grinding motor, the grinding motor can drive the upper grinding wheel to rotate, a rear shell is detachably connected to half of the rear wall surface of the base, and the rear shell is a U-shaped plate; a fixed rod is fixedly connected to the middle section of the top of the base, and the fixed rod is a rod with an inverted L-shaped cross section;

[0007] The knife clamping structure is arranged on the top of the base to fix the blade that needs to be sharpened and ground. The knife clamping structure includes an extension groove, a damping spring rod, a base plate and a pressure plate. The extension groove is opened on the top of the front wall of the base, the damping spring rod is fixedly connected in the extension groove, the base plate is fixedly connected to the front end of the damping spring rod, and the pressure plate is movably connected to the top of the base plate. The top of the base plate can be flush with the top of the fixed rod, and the pressure plate can fix the blade on the top of the plug column.

[0008] As a preferred embodiment of the present invention, the base plate and the pressure plate are rectangular plates, and the clamping knife structure also includes a fixed shaft, a bracket, a slot, a column, a lifting plate, a rotating cylinder and a lifting column. The solid shaft is fixedly connected to the top of the base plate, the bracket is symmetrically fixedly connected to both sides of the top of the base plate, the slot is opened on the front wall surface of each bracket, the columns are symmetrically fixedly connected on both sides of the pressure plate, the symmetrical columns can rotate in the slot, the lifting plate is fixedly connected to the front wall surface of the pressure plate, the lifting plate is located directly above the solid shaft, the rotating cylinder is threadedly connected to the wall surface of the solid shaft, and the lifting column is fixedly connected to the bottom of the rotating cylinder.

[0009] As a preferred embodiment of the present invention, a plurality of slots are evenly arranged on the front wall surface of the bracket, each slot is a horizontal U-shaped groove, the slot can adapt to the rotation of a cylindrical plug-in column, the lifting plate is a capsule-shaped plate, and a capsule-shaped groove is provided on the top of the lifting plate. The rotating drum can slide in the groove of the lifting plate, the solid shaft is a cylinder with a thread on the arc surface, the rotating drum is a circular tube, and the cavity of the rotating drum can be connected to the thread of the solid shaft wall surface, the lifting column is a disk with a diameter larger than that of the rotating drum, the lifting column is located between the pressure plate and the base plate, and a handle is installed on the top of the rotating drum.

[0010] As a preferred embodiment of the present invention, the knife clamping structure also includes an extension frame, an adjustment column and an adjustment rod. The extension frame is symmetrically fixedly connected in the extension groove. The extension frame is composed of multiple rectangular rods that are rotatably connected and spliced. The other end of the extension frame can be fixedly connected to the rear wall of the substrate. The adjustment column is symmetrically rotationally connected in the extension groove. The adjustment rod is L-shaped. The adjustment rod is symmetrically fixedly connected to the two side walls of the substrate, and the adjustment column on each side can be threadedly connected to the adjustment rod on each side.

[0011] As a preferred embodiment of the present invention, a reciprocating structure is also provided on the top of the base, the reciprocating structure includes a reciprocating groove, an inner groove, reciprocating teeth, a reciprocating plate, a moving column, a servo motor, an inner plate and a roller, the reciprocating groove is arranged on the rear half of the top of the base, the inner groove is arranged on the wall surface of the base in the reciprocating groove, the reciprocating teeth are fixedly connected to the wall surface of the base at the bottom of the reciprocating groove, the reciprocating plate is slidably connected in the reciprocating groove, the moving column is rotatably connected to the bottom of the rear wall surface of the reciprocating plate, the servo motor is fixedly connected to the bottom of the rear wall surface of the reciprocating plate, the servo motor can drive the moving column to rotate, the servo motor is an arc surface with a cylinder with meshing teeth, the wall surface of the servo motor can mesh with the reciprocating teeth, the inner plate is fixedly connected to the front wall surface of the reciprocating plate, the inner plate can slide along the inner groove at the same time, the roller is rotatably connected to the wall surface of the inner plate, the roller can roll along the inner groove, the reciprocating groove can adapt to the sliding of the reciprocating plate, and the upper grinding wheel and the grinding motor are located above the reciprocating plate.

[0012] As a preferred embodiment of the present invention, the reciprocating structure also includes a lower frame, a lower grinding wheel, a slide groove, a lower collecting box and a spacing axis. The lower frame is fixedly connected to the top of the reciprocating plate. The lower frame is a U-shaped plate with an opening facing downward. The same grinding motor is installed in the bottom opening of the lower frame. The slide groove is symmetrically opened on the rear wall of the lower frame. The lower grinding wheel is rotatably connected to the top of the lower frame. The lower grinding wheel can be driven by the grinding motor on the wall of the lower frame. The lower collecting box is symmetrically fixedly connected to both sides of the top of the lower frame. The lower collecting box is a hollow right-angled trapezoidal box with an open top, and the spacing axis is rotatably connected to the top of the reciprocating plate.

[0013] As a preferred embodiment of the present invention, the reciprocating structure also includes a spacing plate, an upper frame and a baffle, the spacing plate is threadedly connected to the wall of the spacing shaft, the upper frame is fixedly connected to the front wall of the spacing plate, the grinding motor is fixedly connected to the wall of the upper frame, the upper grinding wheel is rotatably connected to the bottom of the upper frame, the baffle is symmetrically fixedly connected to the top two sides of the upper frame, the baffle is an obtuse-angled plate, the bottom of the upper frame can be fitted with the top of the lower frame, the upper frame is symmetrically fixedly connected with a rectangular rod at the slide groove, the positions of the lower grinding wheel and the upper grinding wheel are aligned, and the symmetrical baffle positions are aligned with the symmetrical lower collection box positions.

[0014] A method for using a knife sharpener comprises the following steps: first, placing the back of a blade to be sharpened between the top of a base plate and the bottom of a pressure plate, and then turning a handle on the top of a rotating drum;

[0015] Step 2: Turn the adjustment column and turn on the power when the position where the blade needs to be ground is aligned with the upper grinding wheel;

[0016] Step 3: After the blade is polished, turn the handle on the top of the drum in the opposite direction, and finally remove the polished blade from the top of the base.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. By setting up a knife clamping structure, blades of different thicknesses and widths can be fixed and ground. The knife clamping structure can adapt to different blades and fix them through a base plate and a pressure plate that can move along the top of the base, so that this solution has a large scope of application.

[0019] 2. The height of the pressure plate can be inserted into slots of different heights through the pins to further adapt to blades of different thicknesses.

[0020] 3. By setting up the reciprocating structure, the blade can be polished in both directions, thereby making this solution have a high polishing efficiency.

[0021] 4. By adjusting the height of the upper rack, blades of different thicknesses can be adapted for grinding, and the lower collection box and baffle can collect the debris from grinding, thereby reducing dust during grinding.

[0022] The specific implementation modes of the present invention are further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In the attached picture:

[0024] Figure 1 It is a stereogram of the present invention;

[0025] Figure 2 It is a perspective view inside the reciprocating groove of the present invention;

[0026] Figure 3 An exploded view of the substrate and the base of the present invention;

[0027] Figure 4 This is an exploded view of the pressing plate and the base plate of the present invention;

[0028] Figure 5 This is an enlarged view of point A of the present invention;

[0029] Figure 6 It is a bottom stereoscopic view of the pressing plate of the present invention;

[0030] Figure 7 It is a three-dimensional diagram of the wall structure of the reciprocating plate of the present invention;

[0031] Figure 8 This is an exploded view of the upper frame and reciprocating plate of the present invention.

[0032] In the figure: 20, base; 21, fixed rod; 22, reciprocating groove; 23, inner groove; 24, reciprocating teeth; 25, back shell; 30, extension groove; 31, damping spring rod; 32, extension frame; 33, adjustment column; 34, base plate; 35, adjustment rod; 36, fixed shaft; 40, bracket; 41, slot; 42, pressure plate; 43, plug column; 44, lifting plate; 45, rotating drum; 46, lifting column; 50, reciprocating plate; 51, moving column; 52, servo motor; 53, inner plate; 54, roller; 60, lower frame; 61, lower grinding wheel; 62, slide; 63, lower collecting box; 64, spacing axis; 65, spacing plate; 66, upper frame; 67, grinding motor; 68, baffle; 69, upper grinding wheel. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention.

[0034] like Figure 1 , Figure 2 and Figure 3 As shown, the base 20 is rectangular in shape, a grinding motor 67 is arranged on the top of the base 20, an upper grinding wheel 69 is arranged below the grinding motor 67, and the grinding motor 67 can drive the upper grinding wheel 69 to rotate, and half of the rear wall surface of the base 20 is surrounded by a rear shell 25 that is disassembled and connected, and the rear shell 25 is a U-shaped plate; a fixed rod 21 is fixedly connected to the middle section of the top of the base 20, and the fixed rod 21 is a rod with an inverted L-shaped cross-section, and the grinding motor 67 is electrically connected to the corresponding power supply. This is an existing technology, so it will not be described here.

[0035] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the knife clamping structure is arranged on the top of the base 20 for fixing the blade that needs to be sharpened and ground. The knife clamping structure includes an extension groove 30, a damping spring rod 31, a base plate 34 and a pressure plate 42. The extension groove 30 is opened at the top of the front wall of the base 20, the damping spring rod 31 is fixedly connected in the extension groove 30, the base plate 34 is fixedly connected to the front end of the damping spring rod 31, and the pressure plate 42 is movably connected to the top of the base plate 34. The top of the base plate 34 can be flush with the top of the fixing rod 21, and the pressure plate 42 can fix the blade on the top of the plug column 43.

[0036] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the base plate 34 and the pressure plate 42 are rectangular plates, and the clamping knife structure also includes a fixed shaft 36, a bracket 40, a slot 41, a plug 43, a lifting plate 44, a rotating drum 45 and a lifting column 46. The fixed shaft 36 is fixedly connected to the top of the base plate 34, and the bracket 40 is symmetrically fixedly connected to the two sides of the top of the base plate 34. The slot 41 is opened on the front wall of each bracket 40, and the plug 43 is symmetrically fixedly connected on both sides of the pressure plate 42. The symmetrical plug 43 can rotate in the slot 41, and the lifting plate 44 is fixedly connected to the front wall of the pressure plate 42. The lifting plate 44 is located directly above the fixed shaft 36, and the rotating drum 45 is threadedly connected to the wall of the fixed shaft 36. The lifting column 46 is fixedly connected to the bottom of the rotating drum 45. A plurality of slots 41 are evenly opened on the front wall of the bracket 40, and each slot 41 is a horizontal U-shaped slot. The slot 41 can adapt to the rotation of the cylindrical plug 43. The lifting plate 44 is a capsule-shaped plate. A capsule-shaped groove is provided on the top of 44, and the rotating drum 45 can slide in the groove of the lifting plate 44. The solid shaft 36 is a cylindrical cylinder with a thread on the arc surface, and the rotating drum 45 is in the shape of a circular tube. The cavity of the rotating drum 45 can be connected with the thread of the wall of the solid shaft 36. The lifting column 46 is a disk with a diameter larger than that of the rotating drum 45. The lifting column 46 is located between the pressing plate 42 and the base plate 34. A handle is installed on the top of the rotating drum 45. The clamping knife structure also includes an extension frame 32, an adjustment column 33 and an adjustment rod 35. The extension frame 32 is symmetrically fixedly connected in the extension groove 30. The extension frame 32 is formed by a plurality of rectangular rods rotatably connected and spliced. The other end of the extension frame 32 can be fixedly connected to the rear wall of the base plate 34. The adjustment column 33 is symmetrically rotatably connected in the extension groove 30. The adjustment rod 35 is in the shape of an L-shaped rod. The adjustment rod 35 is symmetrically fixedly connected to the two side walls of the base plate 34, and the adjustment column 33 on each side can be threadedly connected to the adjustment rod 35 on each side.

[0037] When in use, first align the back edge of the blade to be sharpened with the top of the base plate 34 and cover the bottom of the pressure plate 42 and the top of the blade, then turn the handle on the top of the rotating drum 45 to make the rotating drum 45 rotate upward along the wall of the fixed shaft 36. As the rotating drum 45 rotates, the lifting column 46 can be driven to move upward synchronously, and the lifting column 46 will drive the lifting plate 44 to lift up when moving upward. The lifting plate 44 can drive the pressure plate 42 to turn over with the plug post 43 as the center of the circle, and the downwardly turned edge of the pressure plate 42 can clamp the top of the blade with the plug post 43. At this time, the rotationally symmetrical adjustment The positioning column 33 can drive the base plate 34 and the blade to move forward. With the movement of the base plate 34, the length of the damping spring rod 31 can be extended, and the extension frame 32 will be unfolded. When the required sharpening position of the blade is aligned between the upper grinding wheel 69 and the lower grinding wheel 61 which are symmetrical in the upper and lower directions, the rotation of the positioning column 33 can be stopped, and then the power supply of the grinding motor 67 can be started to grind the blade. After the blade is ground, the rotating drum 45 is rotated in the opposite direction to drive the pressing plate 42 to cancel the pressing of the blade. The pressing plate 42 can drive the plug column 43 to be inserted into the slots 41 of different heights.

[0038] To summarize, by setting up a knife clamping structure, blades of different thicknesses and widths can be fixed and ground. The knife clamping structure can adapt to and fix different blades through a base plate 34 and a pressure plate 42 that can be displaced along the top of the base 20, so that the present solution has a larger scope of application, and the height of the pressure plate 42 can be inserted into a slot 41 of different heights through a plug 43 so as to further adapt to blades of different thicknesses.

[0039] like Figure 1 , Figure 2 , Figure 3 , Figure 7 and Figure 8As shown, a reciprocating structure is also provided on the top of the base 20, and the reciprocating structure includes a reciprocating groove 22, an inner groove 23, a reciprocating tooth 24, a reciprocating plate 50, a moving column 51, a servo motor 52, an inner plate 53 and a roller 54. The reciprocating groove 22 is opened on the rear half of the top of the base 20, the inner groove 23 is opened on the wall surface of the base 20 in the reciprocating groove 22, the reciprocating tooth 24 is fixedly connected to the wall surface of the base 20 at the bottom of the reciprocating groove 22, the reciprocating plate 50 is slidably connected in the reciprocating groove 22, the moving column 51 is rotatably connected below the reciprocating plate 50, and the servo motor 52 is fixedly connected to the bottom of the rear wall surface of the reciprocating plate 50. The servo motor 52 can drive the moving column 51 to rotate. The servo motor 52 is a cylindrical body with meshing teeth on an arc surface. The wall of the servo motor 52 can mesh with the reciprocating teeth 24. The inner plate 53 is fixedly connected to the front wall of the reciprocating plate 50. The inner plate 53 can slide along the inner groove 23 at the same time. The roller 54 is rotatably connected to the wall of the inner plate 53. The roller 54 can roll along the inner groove 23. The reciprocating groove 22 can adapt to the sliding of the reciprocating plate 50. The upper grinding wheel 69 and the grinding motor 67 are located above the reciprocating plate 50. The reciprocating structure also includes a lower frame 60, a lower grinding wheel 61, a slide groove 62, a lower collection box 63 and a spacing The lower frame 60 is fixedly connected to the top of the reciprocating plate 50, and the lower frame 60 is a U-shaped plate with an opening facing downward. The same grinding motor 67 is installed in the bottom opening of the lower frame 60, and the slide groove 62 is symmetrically opened on the rear wall of the lower frame 60. The lower grinding wheel 61 is rotatably connected to the top of the lower frame 60. The lower grinding wheel 61 can be driven by the grinding motor 67 on the wall of the lower frame 60. The lower collecting box 63 is symmetrically fixedly connected to both sides of the top of the lower frame 60. The lower collecting box 63 is a hollow right-angled trapezoidal box with an open top. The spacing shaft 64 is rotatably connected to the top of the reciprocating plate 50. The reciprocating structure also includes a spacing plate 65, an upper The frame 66 and the baffle 68, the spacing plate 65 is threadedly connected to the wall of the spacing shaft 64, the upper frame 66 is fixedly connected to the front wall of the spacing plate 65, the grinding motor 67 is fixedly connected to the wall of the upper frame 66, the upper grinding wheel 69 is rotatably connected to the bottom of the upper frame 66, the baffle 68 is symmetrically fixedly connected to the top two sides of the upper frame 66, the baffle 68 is an obtuse-angled plate, the bottom of the upper frame 66 can fit the top of the lower frame 60, the upper frame 66 is symmetrically fixedly connected with a rectangular rod at the slide groove 62, the position of the lower grinding wheel 61 and the upper grinding wheel 69 are aligned, and the symmetrical position of the baffle 68 is aligned with the symmetrical position of the lower collecting box 63;

[0040] During specific use, after the blade is fixed by the knife clamping structure, the servo motor 52 and all the grinding motor 67 power supplies are started, and the servo motor 52 can drive the moving column 51 to rotate under the reciprocating plate 50. As the moving column 51 rotates, it can mesh with the reciprocating teeth 24, and drive the reciprocating plate 50 to translate along the reciprocating groove 22 through the reaction force. When the servo motor 52 drives the moving column 51 to rotate and drives the reciprocating plate 50 to move to each side, the moving column 51 will be reversed, thereby realizing the reciprocating movement of the reciprocating plate 50. The servo motor 52 can synchronously move along the reciprocating groove 22, and when the power of the grinding motor 67 is turned on, it can drive the upper grinding wheel 69 and the lower grinding wheel 61 to rotate at high speed, and the rotating lower grinding wheel 61 and the upper grinding wheel 69 can grind the blade wall surface when they move along the blade wall surface, and the rotating spacing shaft 64 can make the spacing plate 65 move upward, and with the movement of the spacing plate 65, the upper frame 66 and the upper grinding wheel 69 can be driven to move upward synchronously, and the inner plate 53 and the baffle 68 can collect the debris when the blade is ground;

[0041] In summary, by setting up a reciprocating structure, not only can the blade be grinded in two directions, so that the present solution has a high grinding efficiency; and by adjusting the height of the upper frame 66, blades of different thicknesses can be adapted for grinding, and the lower collection box 63 and the baffle 68 can collect the debris produced by grinding, thereby reducing dust during grinding.

[0042] Working principle: first, align the back edge of the blade to be polished with the top of the base plate 34 and cover the bottom of the pressure plate 42 and the top of the blade, then turn the handle on the top of the rotating drum 45 to make the rotating drum 45 rotate upward along the wall of the fixed shaft 36, and as the rotating drum 45 rotates, the lifting column 46 can be driven to move upward synchronously, and the lifting column 46 will drive the lifting plate 44 to lift up when moving upward, and the lifting plate 44 can drive the pressure plate 42 to flip around the plug column 43 as the center of the circle, and the downward flipped edge of the pressure plate 42 can clamp the top of the blade with the plug column 43, at this time, the rotationally symmetrical adjustment column 33 can drive the base plate 34 and the blade to move forward, and as the base plate 34 moves, the length of the damping spring rod 31 can be extended, and the extension frame 32 will be unfolded, and the rotation of the adjustment column 33 can be stopped when the required cutting edge of the blade is aligned between the upper and lower symmetrical upper grinding wheel 69 and the lower grinding wheel 61, and after the blade is fixed by the knife clamping structure, the servo motor 52 is started. The servo motor 52 and all the grinding motor 67 power supplies can drive the moving column 51 to rotate under the reciprocating plate 50. As the moving column 51 rotates, it can mesh with the reciprocating teeth 24 and drive the reciprocating plate 50 to translate along the reciprocating groove 22 through the reaction force. When the servo motor 52 drives the moving column 51 to rotate and drives the reciprocating plate 50 to move to each side, the moving column 51 will be reversed to achieve the reciprocating movement of the reciprocating plate 50. The servo motor 52 can move synchronously along the reciprocating groove 22. When the grinding motor 67 power supply is turned on, the upper grinding wheel 69 and the lower grinding wheel 61 can be driven to rotate at high speed. When the rotating lower grinding wheel 61 and the upper grinding wheel 69 move along the blade wall, they can grind it. Rotating the spacing shaft 64 can make the spacing plate 65 move upward. As the spacing plate 65 moves, the upper frame 66 and the upper grinding wheel 69 can be driven to move upward synchronously. The inner plate 53 and the baffle 68 can collect the debris when the blade is ground.

[0043] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A knife sharpening machine, characterized in that: include: The base (20) is rectangular in shape, a grinding motor (67) is arranged on the top of the base (20), an upper grinding wheel (69) is arranged below the grinding motor (67), and the grinding motor (67) can drive the upper grinding wheel (69) to rotate; a rear wall surface of the base (20) is half surrounded and disassembled and connected with a rear shell (25), and the rear shell (25) is a U-shaped plate; a fixed rod (21) is fixedly connected to the middle section of the top of the base (20), and the fixed rod (21) is a rod with an inverted L-shaped cross section; A knife clamping structure is arranged on the top of the base (20) and is used to fix the blade that needs to be sharpened and ground. The knife clamping structure includes an extension groove (30), a damping spring rod (31), a base plate (34) and a pressure plate (42). The extension groove (30) is opened on the top of the front wall surface of the base (20), the damping spring rod (31) is fixedly connected in the extension groove (30), the base plate (34) is fixedly connected to the front end of the damping spring rod (31), and the pressure plate (42) is movably connected to the top of the base plate (34). The top of the base plate (34) can be flush with the top of the fixing rod (21), and the pressure plate (42) can fix the blade on the top of the plug column (43).

2. A knife sharpening machine according to claim 1, characterized in that: The base plate (34) and the pressure plate (42) are rectangular plates. The knife clamping structure also includes a fixed shaft (36), a bracket (40), a slot (41), a plug-in column (43), a lifting plate (44), a rotating drum (45) and a lifting column (46). The fixed shaft (36) is fixedly connected to the top of the base plate (34). The bracket (40) is symmetrically fixedly connected to both sides of the top of the base plate (34). The slot (41) is opened on the front wall surface of each bracket (40). The plug-in column (43) is symmetrically fixedly connected on both sides of the pressure plate (42). The symmetrical plug-in columns (43) can rotate in the slot (41). The lifting plate (44) is fixedly connected to the front wall surface of the pressure plate (42). The lifting plate (44) is located directly above the fixed shaft (36). The rotating drum (45) is threadedly connected to the wall surface of the fixed shaft (36). The lifting column (46) is fixedly connected to the bottom of the rotating drum (45).

3. A knife sharpening machine according to claim 2, characterized in that: A plurality of slots (41) are evenly arranged on the front wall surface of the bracket (40), each slot (41) is a horizontal U-shaped notch, the slot (41) can be adapted to rotate with a cylindrical plug post (43), the lifting plate (44) is a capsule-shaped plate, a capsule-shaped slot is penetrated through the top of the lifting plate (44), the rotating drum (45) can slide in the slot of the lifting plate (44), the fixed shaft (36) is a cylinder with a thread on the arc surface, the rotating drum (45) is a circular tube, the cavity of the rotating drum (45) can be connected with the thread of the wall surface of the fixed shaft (36), the lifting column (46) is a disk with a diameter larger than that of the rotating drum (45), the lifting column (46) is located between the pressing plate (42) and the base plate (34), and a handle is installed on the top of the rotating drum (45).

4. A knife sharpening machine according to claim 2, characterized in that: The knife clamping structure further includes an extension frame (32), a position adjusting column (33) and a position adjusting rod (35). The extension frame (32) is symmetrically and fixedly connected in the extension groove (30). The extension frame (32) is formed by rotatably connecting and splicing a plurality of rectangular rods. The other end of the extension frame (32) can be fixedly connected to the rear wall surface of the substrate (34). The position adjusting column (33) is symmetrically and rotatably connected in the extension groove (30). The position adjusting rod (35) is in an L-shaped rod shape. The position adjusting rods (35) are symmetrically and fixedly connected to the two side wall surfaces of the substrate (34). Each position adjusting column (33) can be threadedly connected to each position adjusting rod (35).

5. The knife sharpening machine according to claim 1, characterized in that: A reciprocating structure is further provided on the top of the base (20). The reciprocating structure includes a reciprocating groove (22), an inner groove (23), a reciprocating tooth (24), a reciprocating plate (50), a moving column (51), a servo motor (52), an inner plate (53) and a roller (54). The reciprocating groove (22) is opened in the rear half of the top of the base (20). The inner groove (23) is opened on the wall surface of the base (20) inside the reciprocating groove (22). The reciprocating tooth (24) is fixedly connected to the wall surface of the base (20) at the inner bottom of the reciprocating groove (22). The reciprocating plate (50) is slidably connected in the reciprocating groove (22). The moving column (51) is rotatably connected below the reciprocating plate (50). The servo motor (52) is fixedly connected to the bottom of the rear wall surface of the reciprocating plate (50). The servo motor (52) can drive the moving column (51) to rotate. The servo motor (52) is a cylinder with a meshing tooth on its arc surface. The wall surface of the servo motor (52) can be meshed with the reciprocating tooth (24). The inner plate (53) is fixedly connected to the front wall surface of the reciprocating plate (50). The inner plate (53) can simultaneously slide along the inner groove (23). The roller (54) is rotatably connected to the wall surface of the inner plate (53). The roller (54) can roll along the inner groove (23). The reciprocating groove (22) can accommodate the sliding of the reciprocating plate (50). The upper grinding wheel (69) and the grinding motor (67) are located above the reciprocating plate (50).

6. A knife sharpening machine according to claim 5, characterized in that: The reciprocating structure further includes a lower frame (60), a lower grinding wheel (61), a sliding groove (62), a lower collection box (63) and a spacing shaft (64). The lower frame (60) is fixedly connected to the top of the reciprocating plate (50). The lower frame (60) is a U-shaped plate with an opening facing downwards. A same grinding motor (67) is installed inside the bottom opening of the lower frame (60). The sliding grooves (62) are symmetrically opened on the rear wall surface of the lower frame (60). The lower grinding wheel (61) is rotatably connected to the top of the lower frame (60). The lower grinding wheel (61) can be driven by the grinding motor (67) on the wall surface of the lower frame (60). The lower collection boxes (63) are symmetrically and fixedly connected to both sides of the top of the lower frame (60). The lower collection box (63) is a hollow right trapezoidal box with an open top. The spacing shaft (64) is rotatably connected to the top of the reciprocating plate (50).

7. A knife sharpening machine according to claim 6, characterized in that: The reciprocating structure further comprises a spacing plate (65), an upper frame (66) and a baffle (68); the spacing plate (65) is threadedly connected to the wall surface of the spacing shaft (64); the upper frame (66) is fixedly connected to the front wall surface of the spacing plate (65); the grinding motor (67) is fixedly connected to the wall surface of the upper frame (66); the upper grinding wheel (69) is rotatably connected to the bottom of the upper frame (66); the baffle (68) is symmetrically fixedly connected to the top two sides of the upper frame (66); the baffle (68) is an obtuse-angled plate; the bottom of the upper frame (66) can fit with the top of the lower frame (60); the upper frame (66) is symmetrically fixedly connected with a rectangular rod at the slide groove (62); the positions of the lower grinding wheel (61) and the upper grinding wheel (69) are aligned; the symmetrical positions of the baffle (68) are aligned with the symmetrical positions of the lower collecting box (63).

8. A method for using a knife sharpener, characterized in that: The following steps are involved: The first step is to place the back of the blade to be sharpened between the top of the base plate (34) and the bottom of the pressure plate (42), and then turn the handle on the top of the rotating drum (45); Step 2: Rotate and adjust the adjustment column (33) and turn on the power supply when the position of the blade to be polished is aligned with the upper polishing wheel (69); Step 3: After the blade is polished, the handle on the top of the rotating drum (45) is rotated in the opposite direction, and finally the polished blade is removed from the top of the base (20).

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