Self-adaptive knife sharpening structure and knife sharpener

Abstract

The invention discloses a self-adaptive knife sharpening structure which comprises a knife sharpener and a rotating seat which can rotate along an axis A; the grinding component is arranged on the rotating seat and is provided with at least one grinding surface, and the positioning mechanism at least comprises a limiting part; the side face of the cutter makes contact with the limiting part, the cutting edge is guided to cut into the side face in the direction of the axis A to make contact with the sharpening face, in the initial position state, the distance b is formed between the sharpening face and the cutting edge in the path obliquely pointing to the cutting edge, and the distance b is arranged in the mode that the distance b changes from large to small or from small to large in the path direction of the cutting edge; the blade applies an acting force to the grinding surface to drive the rotating seat to rotate, so that the grinding surface is driven to coaxially rotate along with the rotating seat, and the distance b is further changed to be attached to the blade in a self-adaptive manner; the invention relates to the technical field of knife sharpeners.

Description

Technical Field

[0001] The present invention relates to the technical field of knife sharpeners, and more specifically to an adaptive knife sharpening structure and a knife sharpener. Background Art

[0002] Existing knife sharpening devices have many problems, such as a narrow scope of application, which means they can only grind blades of specific sizes and angles, and are difficult to meet the grinding requirements of blades of different thicknesses and angles; the sharpening effect is poor, and the fit between the blade and the grinding surface is not ideal, resulting in insufficient grinding and an inability to effectively improve the sharpness of the tool; the structure lacks flexibility, and the grinding surface cannot automatically adjust according to the shape and angle of the blade, affecting the efficiency and quality of sharpening. Summary of the Invention

[0003] In view of the shortcomings and defects of the existing technology, an adaptive knife sharpening structure and a knife sharpener are provided, which are suitable for various knife sharpening needs and have better sharpening effects.

[0004] An adaptive knife sharpening structure, comprising: A rotating seat, rotatable along axis A; The grinding component is arranged on the rotating seat and has at least one grinding surface. The positioning mechanism includes at least one limiting portion; The side of the tool contacts the limit part, guiding the blade to cut along the direction of axis A until the side contacts the grinding surface. In the initial position, the grinding surface is inclined toward the path of the blade, and a distance b is formed between the grinding surface and the blade, and the distance b is varied from large to small or from small to large along the path direction of the blade; The blade exerts a force on the grinding surface, driving the rotating seat to rotate, so that the grinding surface is driven to rotate coaxially with the rotating seat, thereby changing the distance b to adaptively fit the blade.

[0005] With the above structure, the adaptive knife sharpening structure of the present invention has the following advantages over the prior art: when in use, one side of the knife is brought into contact with the stopper, and the knife is moved along the axis A until one side of the blade contacts the grinding surface. The stopper guides the movement of the knife, allowing the blade to move along a predetermined path and contact the grinding surface. In the initial position, the grinding surface is inclined toward the path of the blade, and a spacing b is formed between the grinding surface and the blade, and the spacing b is set from large to small or from small to large along the path direction of the blade. The preferred setting of the spacing b is a negative spacing or an extremely small spacing when the spacing b is the smallest. After the blade contacts the grinding surface, a force is applied to the grinding surface. To offset the force, the rotating seat drives the grinding surface to rotate to adjust the distance b between the blade and the grinding surface, thereby fitting the blade. When the preferred distance b is set, the blade usually increases the distance b to fit the blade after entering. The distance b refers to the distance b between the grinding surface and the blade at the position where the grinding surface contacts the blade. Further, by moving the tool back and forth, the grinding surface rubs against the blade, which can grind the blade. The limiter maintains contact with the side of the tool when the tool moves back and forth, and can also guide the forward and backward movement of the tool, so that the blade can move linearly, further improving the consistency of the grinding quality.

[0006] Traditional knife sharpening structures are mostly fixed grinding surfaces that cannot automatically adjust according to the thickness, shape and angle of the blade, resulting in the sharpening effect not meeting the needs; In the present application, the grinding surface can change position along with the rotating seat to adjust the distance b with the blade, thereby adaptively fitting the blade. The grinding surface adaptively obtains an effective contact area with the blade, which improves the accuracy and effect of sharpening during the sharpening operation, and can also meet the grinding requirements of blades of different thicknesses and different angles.

[0007] As an improvement of the present invention, the elastic reset member is a coil spring, one end of the coil spring is connected to one circumferential side of the rotating seat, and the other end is connected to a connecting member away from the rotating seat.

[0008] As an improvement of the present invention, the grinding components are two grinding wheels rotatably connected to a rotating seat, the two grinding wheels are coaxially arranged, and the rotation axes c of the grinding wheels intersect with the axis A and are perpendicular to each other; The opposite inner end faces of the two grinding wheels serve as grinding surfaces, and a tool groove is formed between them.

[0009] As an improvement of the present invention, The limiting parts are arranged at intervals along the path direction of the blade, and the grinding surface is located between the front and rear limiting parts.

[0010] As an improvement of the present invention, the limiting portion is arranged symmetrically along the path of the blade, and the limiting portion is located between the left and right limiting portions.

[0011] As an improvement of the present invention, the limiting portion is a sphere and can roll along with the movement of the tool.

[0012] As an improvement of the present invention, the positioning mechanism further includes a mounting seat, an upper end of the mounting seat is provided with a mounting groove, and the outer side of the limiting portion is embedded in the mounting groove; An elastic member is provided in the mounting groove and stops at the outer side of the limiting part. When the tool squeezes the limiting part, the limiting part can move outward under the elastic action of the elastic member. After the tool moves out, the limiting part loses the force of the tool and is reset under the elastic action of the elastic member.

[0013] As an improvement of the present invention, the elastic member is a support arm with an elongated structure, the lower end of the support arm is connected to the mounting seat, and the upper end is bent inward and extends into the mounting groove and stops at the outer side of the limiting portion.

[0014] As an improvement of the present invention, a limiting protrusion is further provided at the outer end of the installation groove. After the limiting portion moves outward to cooperate with the limiting protrusion, the limiting portion is restricted by the limiting portion to an extreme position of outward movement.

[0015] A knife sharpener comprises a base, wherein the bottom of the rotating base is provided with a connecting hole extending up and down, the end surface of the bottom of the rotating base abuts against the end surface of the base, and a pin body is provided on the base and penetrates into the connecting hole; The base is also provided with a shell connected to the outside of the adaptive sharpening structure, and the shell is provided with a through slot for the blade to pass through and contact the sharpening surface; The base is provided with a handle, the handle has a rod body extending transversely as a gripping portion, the handle is also provided with a slide plate parallel to the rod body, and the base is provided with a slide groove that slides with the slide plate. The handle is laterally movably connected to the base through the cooperation of the slide plate and the slide groove. In the storage state, the handle moves horizontally until the rod body enters the base, and the rod body is located between the through slot and the adaptive sharpening structure to limit the knife from entering through the through slot. In the use state, the handle is moved laterally until the rod body is removed from the base, and the rod body can be grasped.

[0016] When the sharpener is not in use, the handle can be slid until the rod body is located between the through slot and the adaptive sharpening structure for storage. When stored, the sharpener occupies very little space as a whole, and the rod body acts as a shield under the through slot, which can limit the entry of objects and protect the sharpening structure from damage. When in use, the handle is slid until the rod body is removed from the base, and the shielding effect of the rod body is lost below the through slot. At this time, the blade can be inserted through the through slot to contact the grinding surface for grinding operation; The limiting portion is exposed to one side or both sides of the through slot, and when the blade penetrates, the limiting portion can directly contact the side surface of the tool.

[0017] The rod can be held by the user during the sharpening operation, making the overall structure more stable and achieving better sharpening results. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1It is a structural schematic diagram of the present invention.

[0019] Figure 2 It is a schematic cross-sectional structural diagram of the present invention.

[0020] Figure 3 Schematic diagram of the positional relationship between the grinding surface and the blade path of the present invention.

[0021] Figure 4 It is a schematic diagram of an implementation of the present invention.

[0022] Figure 5 It is a schematic diagram of the position structure of the handle of the present invention when in use.

[0023] Figure 6 It is a schematic structural diagram of the present invention when the handle is in the storage state.

[0024] Figure 7 It is a schematic structural diagram of the fixed-angle knife sharpener exposed after the detachable parts on the handle of the present invention are removed.

[0025] As shown in the figure: 1. Rotating seat; 2. Grinding component; 2.1. Grinding surface; 2.11. Grinding wheel; 3. Limiting part; 4. Elastic reset part; 5. Mounting seat; 5.1. Mounting groove; 5.11. Limiting protrusion; 5.2. Elastic part; 6. Tool; 6.1. Blade; 7. Base; 7.1. Shell; 7.11. Through groove; 8. Handle; 8.1. Rod body; 8.2. Slide plate; 8.3. Fixed-angle sharpener. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0027] See also Figure 1-4 As shown, an adaptive knife sharpening structure includes: The rotating seat 1 is rotatable along the axis A; The grinding component 2 is arranged on the rotating seat 1 and has at least one grinding surface 2.1. The positioning mechanism comprises at least one limiting portion 3; The side of the tool 6 contacts the limit portion 3, and the guide blade 6.1 cuts in along the direction of the axis A until the side contacts the grinding surface 2.1. In the initial position, the grinding surface 2.1 is tilted toward the path of the blade 6.1, and a distance b is formed between the grinding surface 2.1 and the blade 6.1, and the distance b is changed from large to small or from small to large along the path of the blade 6.1; The blade 6.1 exerts a force on the grinding surface 2.1, driving the rotating base 1 to rotate, so that the grinding surface 2.1 rotates coaxially with the rotating base 1, thereby changing the distance b to adaptively fit the blade 6.1.

[0028] During use, the tool 6 is placed in contact with the stopper 3 on one side thereof and moved along the axis A until the side of the blade 6.1 contacts the grinding surface 2.1. The stopper 3 guides the movement of the tool 6, so that the blade 6.1 moves along a predetermined path and contacts the grinding surface 2.1. In the initial position, the grinding surface 2.1 is tilted toward the path of the blade 6.1, and a distance b is formed between the grinding surface 2.1 and the blade 6.1. The distance b is set from large to small or from small to large along the path of the blade 6.1. The preferred setting of the distance b is a negative distance or an extremely small distance when the distance b is the smallest. After the blade 6.1 contacts the grinding surface 2.1, a force is applied to the grinding surface 2.1. To counteract the force, the rotating base 1 drives the grinding surface 2.1 to rotate, thereby adjusting the distance b between the grinding surface 2.1 and the blade 6.1, thereby allowing the grinding surface 2.1 to fit closely with the blade 6.1. When the preferred distance b is set as described above, the distance b is usually increased after the blade 6.1 enters the grinding surface 2.1 to fit closely with the blade 6.1. The distance b described above refers to the distance b between the grinding surface 2.1 and the blade 6.1 at the point where the grinding surface 2.1 contacts the blade 6.1. Furthermore, by moving the tool 6 back and forth, the grinding surface 2.1 rubs against the blade 6.1, thereby grinding the blade 6.1.

[0029] When the tool moves forward and backward, the limiting portion 3 maintains contact with the side of the tool 6, and can also guide the forward and backward movement of the tool 6, so that the blade 6.1 can move linearly, further improving the consistency of the grinding quality.

[0030] Conventional knife sharpening structures mostly have a fixed sharpening surface 2.1 that cannot automatically adjust according to the thickness, shape, and angle of the blade 6.1, resulting in unsatisfactory sharpening results. In the present application, the grinding surface 2.1 can change its position along with the rotating seat 1 to adjust the distance b with the blade 6.1, thereby adaptively fitting the blade 6.1. The grinding surface 2.1 adaptively obtains an effective contact area with the blade 6.1, which improves the accuracy and effect of the sharpening during the sharpening operation, and can also meet the grinding requirements of blades 6.1 of different thicknesses and different angles.

[0031] See also Figure 1-3 As shown, the rotating seat 1 is connected to an elastic reset member 4, which applies a pre-tightening force to the rotating member, driving it to have a tendency to maintain its initial position.

[0032] In the existing knife sharpening structure, the tool 6 is easily deviated from the initial position during the grinding process, and the misalignment between the tool and the grinding surface 2.1 causes a decrease in the knife sharpening accuracy.

[0033] In the present application, an elastic reset member 4 is provided to provide a pre-tightening force to the rotating seat 1. When the tool 6 deviates, the rotating seat 1 also rotates adaptively, thereby keeping the grinding surface 2.1 in contact with the blade 6.1, which is beneficial to improving the consistency and accuracy of the knife grinding and reducing the problem of insufficient or excessive grinding caused by position deviation.

[0034] Of course, during the sharpening process, the preload force can also directly force the sharpening surface 2.1 to press against the blade 6.1, thereby improving the sharpening effect.

[0035] The traditional grinding structure will cause the grinding surface 2.1 to wear out as the number of grindings increases. The worn grinding surface 2.1 cannot maintain effective and consistent contact with the blade 6.1, which reduces the grinding quality. After the above improvements, even if the grinding surface 2.1 is worn, the preload force of the elastic reset member 4 can still keep the grinding surface 2.1 and the blade 6.1 in effective contact, thereby extending the service life of the device and ensuring stable grinding quality.

[0036] In addition, after the tool 6 is ground and removed, the pre-tightening force of the elastic reset member 4 drives the rotating seat 1 to rotate to reset. When the blade 6.1 comes into contact with the grinding next time, the grinding surface 2.1 can still form an angle b with the path of the blade 6.1, so that the rotating seat 1 can still rotate to make the grinding surface 2.1 fit the blade 6.1, so that the device can stably and reliably perform adaptive grinding.

[0037] The elastic reset member 4 is a coil spring, one end of which is connected to one circumferential side of the rotating base 1 , and the other end of which is connected to a connecting member away from the rotating base 1 .

[0038] The coil spring has the advantages of simple structure, high reliability, and easy control of elastic force. When used in this application, it can accurately provide pre-tightening force for the rotating seat 1, ensuring that the rotating seat 1 remains stably in the initial position during the grinding process and quickly resets after grinding.

[0039] See also Figure 1 As shown in FIG. 3 , the grinding member 2 is two grinding wheels 2.11 rotatably connected to the rotating base 1 , the two grinding wheels 2.11 are coaxially arranged, and the rotation axis c of the grinding wheel 2.11 intersects the axis A and is perpendicular to each other; The inner opposite end surfaces of the two grinding wheels 2.11 serve as the grinding surfaces 2.1, and a knife groove is formed therebetween. When the blade 6.1 moves along the axis A, it can stably enter the knife groove and come into contact with the grinding surface 2.1, making the device operate reliably.

[0040] Compared with the single grinding surface 2.1 grinding method, the double grinding wheel 2.11 structure of the present invention has two grinding surfaces 2.1, and the middle position between the two grinding surfaces 2.1 coincides with the axis A. It can contact both sides of the blade 6.1 at the same time, which can significantly improve the efficiency and quality of sharpening. In the present invention, the rotation axis of the grinding wheel 2.11 and the path of the blade 6.1 are arranged in an inclined staggered manner, and the distance b between the grinding surfaces 2.1 of the two grinding wheels 2.11 and the path of the blade 6.1 is arranged rotationally symmetrically along the axis A; After the blade 6.1 enters the blade groove, the front grinding surface 2.1 of the left grinding wheel 2.11 is in contact with the left side of the blade 6.1, and the rear grinding surface 2.1 of the right grinding wheel 2.11 is in contact with the right side of the blade 6.1. The contact positions are staggered front and back, and can contact both sides of the blade 6.1 at the same time to achieve a grinding effect.

[0041] The conventional grinding wheel 2.11 is perpendicular to the path of the blade 6.1. After the blade 6.1 enters the tool groove, if the tool 6 is thin, both sides of the blade 6.1 cannot contact the grinding surface 2.1 at the same time, and consistent and efficient grinding cannot be performed.

[0042] Furthermore, the grinding surface 2.1 in the present application is a conical surface, which can maintain effective fit to the cutting edges of various tools 6 according to different adaptive adjustments of the contact area. While ensuring the uniformity and effect of grinding, it can meet the grinding needs of various tools 6.

[0043] See also Figure 2-4 As shown, The limiting portions 3 are arranged at intervals along the path direction of the blade 6 . 1 , and the grinding surface 2 . 1 is located between the front and rear limiting portions 3 .

[0044] The front and rear limiting parts 3 are in contact with one side of the blade 6.1 at the same time, and when the tool 6 moves forward and backward, they play a limiting role at the same time, so that the forward and backward movement of the tool 6 tends to be straight, and then it can stably contact the grinding surface 2.1, thereby improving the grinding effect.

[0045] The limiting portion 3 is symmetrically arranged along the path of the blade 6 . 1 , and the limiting portion 3 is located between the left and right limiting portions 3 .

[0046] In the existing adaptive knife sharpening structure, the setting mode of the limiting portion 3 is relatively simple, and usually only considers the limiting of one direction or one side of the blade 6.1.

[0047] In this application, by arranging the limiting parts 3 along the path of the blade 6.1 and symmetrically, a multi-directional and multi-angle limiting system is formed, which can limit the tool 6 from multiple directions. Specifically, the symmetrical limiting parts 3 can prevent the tool 6 from shifting in the lateral direction, and the limiting parts 3 arranged in the front and back can prevent the tool 6 from deflecting, ensuring that the blade 6.1 always maintains a precise contact position and angle with the grinding surface 2.1 during the grinding process. This improves the accuracy and effectiveness of the sharpening.

[0048] The limiting portion 3 is a sphere and can roll along with the movement of the tool 6 .

[0049] In a conventional adaptive knife sharpening structure, the limiting portion 3 is usually a fixed rigid component, such as a limiting block, a limiting column, etc., and the relative movement between the limiting portion 3 and the tool 6 can easily cause scratches and damage to the tool 6.

[0050] The present invention designs the stopper 3 as a rollable sphere, preferably made of rubber. The rolling characteristics of the spherical stopper 3 enable relative rolling friction between the tool 6 and the stopper 3 during the grinding process, thereby significantly reducing scraping and wear between the tool 6 and the stopper 3 while ensuring the limiting effect. In addition, the movement resistance of the tool 6 is reduced, improving the user experience.

[0051] See also Figure 1 As shown, the positioning mechanism further includes a mounting seat 5, the upper end of which is provided with a mounting groove 5.1, and the outer side of the limiting portion 3 is embedded in the mounting groove 5.1; An elastic member 5.2 is provided in the mounting groove 5.1 and stops against the outer side of the limiting portion 3. When the tool 6 squeezes the limiting portion 3, the limiting portion 3 can move outward under the elastic action of the elastic member 5.2. After the tool 6 moves out, the limiting portion 3 loses the force of the tool 6 and is reset under the elastic action of the elastic member 5.2.

[0052] The elastic member 5.2 gives the stopper 3 a certain degree of elastic adjustment capability, allowing it to accommodate tools 6 of varying sizes and shapes. When the tool 6 is thick, the stopper 3 can be moved outward under the action of the elastic member 5.2, providing sufficient space for the tool 6, thus avoiding problems such as the tool 6 being unable to be properly inserted or the grinding being restricted due to the fixed position of the stopper 3.

[0053] At the same time, the reset function of the elastic member 5.2 ensures that the limiting portion 3 can always fit closely with the tool 6 during the grinding process, maintaining a good limiting effect.

[0054] The elastic member 5.2 is a support arm with an elongated structure. The lower end of the support arm is connected to the mounting seat 5, and the upper end is bent inward and extends into the mounting groove 5.1 and stops at the outer side of the limit part 3.

[0055] The use of a long strip-shaped bent arm as the elastic member 5.2 not only meets the elastic requirements of the limiting portion 3 but also optimizes the structure and cost.

[0056] A limiting protrusion 5.11 is further provided at the outer end of the mounting groove 5.1. After the limiting portion 3 moves outwards to engage with the limiting protrusion 5.11, the limiting portion 3 is limited by the limiting portion 3 to be at the extreme position of outward movement.

[0057] A limiting protrusion 5.11 is provided at the outer end of the mounting groove 5.1 to limit the outward movement trajectory of the contact part so as to have an extreme position, effectively preventing the contact part from being excessively displaced and dislocated, and the elastic member 5.2 from being damaged, thereby ensuring the stability and reliability of the structure.

[0058] See also Figure 1 、 Figure 5-7 As shown, a knife sharpener includes a base 7, a connecting hole extending up and down is provided at the bottom of the rotating base 1, the end surface of the bottom of the rotating base 1 abuts against the end surface of the base 7, and a pin body is provided on the base 7 to penetrate into the connecting hole; The base 7 is further provided with a shell 7.1 surrounding the outer side of the adaptive sharpening structure. The shell 7.1 is provided with a through slot 7.11 for the blade 6.1 to pass through and contact the sharpening surface 2.1. The base 7 is provided with a handle 8, which has a rod body 8.1 extending transversely as a grip portion, and the handle 8 is further provided with a slide plate 8.2 parallel to the rod body 8.1, and the base 7 is provided with a slide groove that slides with the slide plate 8.2. The handle 8 is laterally movably connected to the base 7 through the slide 8.2 and the slide groove. In the storage state, the handle 8 moves laterally until the rod body 8.1 enters the base 7, and the rod body 8.1 is located between the through slot 7.11 and the adaptive sharpening structure to restrict the knife 6 from entering through the through slot 7.11; In the use state, the handle 8 is moved laterally until the rod body 8.1 is removed from the base 7, and the rod body 8.1 can be grasped.

[0059] When the knife sharpener is not in use, the handle 8 can be slid to the rod body 8.1 between the through slot 7.11 and the adaptive knife sharpening structure so that it can be stored. When stored, the knife sharpener as a whole occupies very little space, and the rod body 8.1 acts as a shield under the through slot 7.11, which can limit the entry of objects and protect the knife sharpening structure from damage. When in use, the handle 8 is slid until the rod body 8.1 is removed from the base 7, and the shielding effect of the rod body 8.1 is lost below the through slot 7.11. At this time, the blade 6.1 can be inserted through the through slot 7.11 to contact the grinding surface 2.1 for grinding operation; The limiting portion 3 is exposed to one side or both sides of the through slot 7.11. When the blade 6.1 penetrates, the limiting portion 3 can directly contact the side surface of the tool 6.

[0060] The rod body 8.1 can be held by the user during the sharpening operation, so that the overall structure is more stable and the sharpening effect is better.

[0061] The handle 8 may also be provided with a fixed-angle knife sharpener 8.3 for the user to use, thereby improving the functionality of the device.

[0062] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions based on the principles of the present invention are within the scope of protection of the present invention. It should be noted that improvements and modifications that do not depart from the principles of the present invention are within the scope of protection of the present invention.

Claims

1. An adaptive knife sharpening structure, characterized in that: include: A rotating seat (1) is rotatable along an axis A; The grinding component (2) is arranged on the rotating seat (1) and has at least one grinding surface (2.1). The positioning mechanism comprises at least one limiting portion (3); The side surface of the tool (6) contacts the limiting portion (3), and the guide blade (6.1) cuts in along the direction of the axis A until the side surface contacts the grinding surface (2.1). In the initial position, the grinding surface (2.1) is inclined toward the path of the blade (6.1), and a distance b is formed between the grinding surface (2.1) and the blade (6.1), and the distance b is set to change from large to small or from small to large along the path direction of the blade (6.1); The blade (6.1) exerts a force on the grinding surface (2.1), driving the rotating seat (1) to rotate, so that the grinding surface (2.1) rotates coaxially with the rotating seat (1), thereby changing the spacing b to adaptively fit the blade (6.1).

2. The adaptive knife sharpening structure according to claim 1, characterized in that: It also includes an elastic reset member connected to the rotating seat (1) to apply a pre-tightening force to the rotating seat (1) to drive it to have a tendency to remain in the initial position state.

3. The adaptive knife sharpening structure according to claim 2, characterized in that: The elastic reset member (4) is a coil spring, one end of which is connected to one circumferential side of the rotating seat (1), and the other end of which is connected to a connecting member away from the rotating seat (1).

4. The adaptive knife sharpening structure according to claim 1, characterized in that: The grinding components (2) are two grinding wheels (2.11) rotatably connected to the rotating seat (1), the two grinding wheels (2.11) are coaxially arranged, and the rotation axes c of the grinding wheels (2.11) intersect with the axis A and are perpendicular to each other; The inner opposite end surfaces of the two grinding wheels (2.11) serve as grinding surfaces (2.1), and a tool groove is formed therebetween.

5. The adaptive knife sharpening structure according to claim 1, characterized in that: The limiting portions (3) are arranged at intervals along the path direction of the blade (6.1), and the grinding surface (2.1) is located between the front and rear limiting portions (3).

6. The adaptive knife sharpening structure according to claim 1, characterized in that: The limiting portion (3) is arranged symmetrically along the path of the blade (6.1), and the limiting portion (3) is located between the left and right limiting portions (3).

7. The adaptive knife sharpening structure according to claim 1, characterized in that: The limiting portion (3) is a sphere and can roll along with the movement of the tool (6).

8. The adaptive knife sharpening structure according to claim 1, characterized in that: The positioning mechanism further comprises a mounting seat (5), the upper end of the mounting seat (5) being provided with a mounting groove (5.1), and the outer side of the limiting portion (3) being embedded in the mounting groove (5.1); An elastic member (5.2) is provided in the mounting groove (5.1) and is stopped against the outer side of the limiting portion (3). When the tool (6) presses the limiting portion (3), the limiting portion (3) can move outward under the elastic action of the elastic member (5.2). After the tool (6) moves out, the limiting portion (3) loses the action of the tool (6), and the limiting portion (3) is reset under the elastic action of the elastic member (5.2).

9. The adaptive knife sharpening structure according to claim 8, characterized in that: A limiting protrusion (5.11) is also provided at the outer end of the mounting groove (5.1), and after the limiting portion (3) moves outwards to engage with the limiting protrusion (5.11), the limiting portion (3) is limited by the limiting protrusion (5.11) to a limit position of outward movement.

10. A knife sharpener, comprising an adaptive knife sharpening structure according to any one of claims 1 to 9, characterized in that: It comprises a base (7), wherein the bottom of the rotating seat (1) is provided with a connecting hole extending upward and downward, the bottom end surface of the rotating seat (1) abuts against the end surface of the base (7), and a pin body is provided on the base (7) and penetrates into the connecting hole; The base (7) is further provided with a shell (7.1) connected to the outside of the adaptive sharpening structure, and the shell (7.1) is provided with a through groove (7.11) for the blade (6.1) to pass through and contact the sharpening surface (2.1); The base (7) is provided with a handle (8), the handle (8) having a rod body (8.1) extending transversely as a grip portion, the handle (8) further being provided with a slide plate (8.2) parallel to the rod body (8.1), and the base (7) being provided with a slide groove slidably engaged with the slide plate (8.2). The handle (8) is laterally movably connected to the base (7) through the slide (8.2) and the slide groove. In the storage state, the handle (8) moves laterally until the rod body (8.1) enters the base (7), and the rod body (8.1) is located between the through slot (7.11) and the adaptive sharpening structure to restrict the knife (6) from entering through the through slot (7.11). In the use state, the handle (8) is moved laterally until the rod body (8.1) is removed from the base (7), and the rod body (8.1) can be grasped.

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