Multifunctional tool sharpener

Abstract

The utility model discloses a multi-functional knife grinder, including frame, grinding mechanism, motor and adjusting device, adjusting device includes first rotating block, handle and elastic telescopic rod, elastic telescopic rod rear end is rotatingly connected with frame, elastic telescopic rod front end is rotatingly connected with first rotating block, driven runner is connected with first rotating block through first rotating shaft. According to the tool sharpener, quick replacement operation of the grinding belt can be achieved, during operation, the handle can be pulled to drive the distance between the driven rotating wheel and the driving rotating wheel to be reduced, so that a new grinding belt can be easily replaced to be arranged on the outer sides of the two rotating wheels in a sleeving mode, then the handle is loosened, and the elastic telescopic rod can automatically push the driven rotating wheel to reset; therefore, the distance between the two rotating wheels recovers to abut against a new grinding belt, the grinding belt can be replaced, and the operation is very convenient and fast.

Description

Technical Field

[0001] This utility model belongs to the field of grinding equipment technology, and specifically relates to a multi-functional knife grinding machine. Background Technology

[0002] Knives are prone to damage such as chipping when cutting items. In this case, the knife user can take the knife with chipped blade to the after-sales service station for after-sales service. After receiving the damaged knife, the after-sales service station will use a knife sharpening machine to repair the chipped blade.

[0003] Existing knife sharpening machines typically include a frame, a grinding mechanism mounted on the frame, and a motor. The grinding mechanism includes a driving wheel, a driven wheel, and a grinding belt mounted on the frame, and the motor shaft is connected to the driving wheel for transmission. In use, the motor is first turned on to drive the driving wheel to rotate, which in turn drives the grinding belt to rotate. The chipped edge of the knife is then placed against the grinding belt, and the chipped edge is ground and repaired by the grinding belt. The operation is convenient.

[0004] However, existing sharpening machines still have shortcomings. After long-term use, the grinding belt is prone to wear and tear. When the grinding belt is worn, it needs to be replaced before grinding and repair work can continue. However, the distance between the driven and driven rollers of existing sharpening machines cannot be adjusted. Simply relying on the tension deformation of the grinding belt makes it difficult to remove the old grinding belt from the outside of the two rollers, and it is also difficult to put the new grinding belt on the outside of the two rollers. The grinding belt replacement operation is very inconvenient. Utility Model Content

[0005] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a multi-functional knife sharpening machine that facilitates the replacement of the grinding belt.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a multi-functional knife sharpening machine, including a frame, a grinding mechanism mounted on the frame, and a motor. The grinding mechanism includes a driving wheel, a driven wheel, and a grinding belt mounted on the frame, and fitted around the outside of the driving wheel and the driven wheel. The motor shaft is drivenly connected to the driving wheel. The multi-functional knife sharpening machine also includes an adjustment device, which includes a first rotating block rotatably connected to the frame, a handle connected to the first rotating block, and an elastic telescopic rod. The rear end of the elastic telescopic rod is rotatably connected to the frame, and the front end of the elastic telescopic rod is rotatably connected to the first rotating block. The driven wheel is connected to the first rotating block through a first rotating shaft, and the rotation axis of the first rotating block is parallel to the rotation axis of the driven wheel.

[0007] In the above scheme, a first rotating block is rotatably connected to the frame, and the driven rotating wheel is connected to the first rotating block through a first rotating shaft, so that the driven rotating wheel can rotate around the first rotating shaft. When the grinding belt needs to be replaced, the handle can be turned to rotate the first rotating block backward. When the first rotating block rotates backward, it will compress the elastic telescopic rod, which will provide elastic support and cushioning for the first rotating block. Furthermore, the rotation of the first rotating block will cause the driven rotating wheel to swing backward and move closer to the driving rotating wheel via the first rotating shaft, thereby reducing the distance between the driven and driving rotating wheels. This allows the old grinding belt to be easily removed from the outside of the two rotating wheels. Then, the new grinding belt can be placed on the outside of the two rotating wheels. Releasing the handle will cause the elastic telescopic rod to rebound and automatically push the first rotating block forward to reset, thereby resetting the driven rotating wheel. At this point, the distance between the driven and driving rotating wheels is restored, tightening the new grinding belt. This completes the grinding belt replacement operation, which is convenient. Moreover, because the elastic telescopic rod always provides a forward rotational thrust to the first rotating block, it ensures that the grinding belt remains taut, making it less likely to detach from the rotating wheels during operation and providing a better grinding effect.

[0008] Preferably, the aforementioned elastic telescopic rod is a nitrogen spring. Nitrogen springs have high elasticity and stable elasticity, which can satisfy the tensioning effect on the grinding belt and provide stable buffering for the impact generated by the grinding belt during operation.

[0009] Furthermore, the aforementioned adjustment device also includes a second rotating block rotatably connected to the first rotating block, and a screw threadedly connected to the second rotating block. The first rotating shaft is connected to the second rotating block, and the inner end of the screw abuts against the side wall of the frame. Rotating the screw causes it to move relative to the second rotating block, and the rotation axis of the first rotating block is perpendicular to the rotation axis of the second rotating block. During the grinding process, the driven rotating wheel is prone to misalignment due to the long-term tension of the grinding belt, which causes the two rotating wheels to lose parallelism and affects the normal operation of the grinding belt. When the driven rotating wheel and the driving rotating wheel lose parallelism, the user can rotate the screw inward relative to the second rotating block. Since the inner end of the screw is already abutting against the side wall of the frame, continuing to rotate the screw will not move the screw but will cause the second rotating block to rotate to the right. At the same time, it will drive the first rotating shaft and the driven rotating wheel to rotate to the right along with the second rotating block, thus adjusting the driven rotating wheel to be parallel to the driving rotating wheel.

[0010] Furthermore, the screw is provided with a handle at its outer end, which allows for easy rotation of the screw.

[0011] Furthermore, the aforementioned first rotating block is threadedly connected to the frame via bolts. The first rotating block can rotate relative to the frame around the bolt as its axis of rotation. The outer end of the bolt has a nut, and a limiting block is provided on the outer side of the first rotating block. The limiting block has a limiting groove corresponding to the nut, which mates with the nut. The nut is fitted into the limiting groove of the limiting block, thus keeping the limiting block and the nut synchronized. The limiting block also has a clearance groove, through which a screw passes and is threadedly connected to the first rotating block, with the screw head abutting against the outer side of the limiting block. This design, by providing a clearance groove on the limiting block, ensures that when the bolt rotates around the first rotating block, the limiting block rotates synchronously with the bolt, during which the screw slides relative to it along the clearance groove. When the screw is tightened, the screw head is pressed against the limiting block, effectively fixing the limiting block to the outside of the first rotating block. In this state, the screw and the clearance groove will not slide relative to each other, and the bolt will not rotate relative to the first rotating block, thus preventing the bolt from loosening and improving structural stability. Furthermore, when the screw is tightened, and the handle is turned to rotate the first rotating block backward, the limiting block will rotate the bolt in the loosening direction via the nut, creating a gap between the first rotating block and the frame contact surface. This makes the backward rotation of the first rotating block easier and smoother. When the first rotating block rotates forward, the limiting block will rotate the bolt in the tightening direction via the nut, restoring the contact surface between the first rotating block and the frame to a close fit. This ensures the installation stability of the first rotating block and the frame.

[0012] Furthermore, the aforementioned multi-functional knife sharpening machine also includes a grinding wheel rotatably connected to the frame. After the chipped edge of a knife is repaired by grinding with a grinding belt, burrs and other dirt will remain on the blade surface. At this time, the user can grind the knife with the grinding wheel to remove the dirt from the blade surface, making the blade surface smoother. The shaft of the grinding wheel is connected to a first gear, the shaft of the drive wheel is connected to a second gear, and the shaft of the motor is connected to a drive gear. The drive gear is connected to the first and second gears via a toothed belt. This allows one motor to drive the grinding belt and grinding wheel simultaneously, reducing the number of motors required, making the knife sharpening machine smaller, and saving electricity.

[0013] Furthermore, the aforementioned frame is rotatably connected to an auxiliary gear that meshes with the toothed belt, making the installation of the toothed belt more stable and improving the transmission stability between the toothed belt and the gears. Specifically, the first gear, auxiliary gear, and drive gear are located inside the toothed belt, while the second gear is located outside the toothed belt. This allows the first and second gears to rotate in opposite directions. Specifically, the grinding belt can be configured to rotate backward, while the grinding wheel can be configured to rotate forward. Thus, when using the grinding belt and grinding wheel to grind the tool, the grinding debris ejected from the tool will be ejected in the opposite direction to the user, making it safer to use.

[0014] Furthermore, the frame is equipped with a protective cover with an opening on the outer side of the grinding wheel. A cover plate is rotatably connected to the inner side of the protective cover. The cover plate can rotate relative to the protective cover to open and close the opening. When the cover plate is rotated open, the user can use the grinding wheel to grind the tool through the opening. When the cover plate is rotated closed, the protective cover and the cover plate can completely cover the grinding wheel to prevent dust from entering and to prevent the user from accidentally touching the grinding wheel, making it safer to use.

[0015] Furthermore, the aforementioned frame is provided with a support plate on the upper inner side of the grinding belt, and the upper part of the support plate is opposite to the upper inner side of the grinding belt. During the sharpening operation, since the blade exerts downward pressure on the grinding belt, the support plate can provide certain support for the grinding belt, so that there is a better contact force between the grinding belt and the blade, thereby improving the sharpening effect.

[0016] Furthermore, the aforementioned support plate has a sliding groove, and an adjusting screw passes through the sliding groove and is threadedly connected to the frame. In use, when the adjusting screw is tightened, the screw head will lock the support plate, preventing the support plate from moving up and down; when the adjusting screw is loosened, the support plate can move up and down along the adjusting screw through its sliding groove, thereby adjusting the height of the support plate to adjust the gap between the support plate and the grinding belt.

[0017] This multi-functional knife sharpening machine allows for easy replacement of the grinding belt by reducing the distance between the driven and driven rollers by turning the handle. The parallelism between the driven and driven rollers can be adjusted by rotating the screw, and the support plate supports the grinding belt during sharpening, improving the sharpening effect. Furthermore, a single motor can drive both the grinding belt and the grinding wheels simultaneously, resulting in a more compact structure, energy savings, and safer operation as the grinding belt and wheels rotate in opposite directions to prevent grinding debris from being thrown at the user. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the multi-functional knife sharpening machine in the first position according to an embodiment of the present invention (the cover plate is in a closed state in the figure).

[0019] Figure 2 This is a schematic diagram of the multi-functional knife sharpening machine in the second position according to an embodiment of the present invention.

[0020] Figure 3 This is a schematic diagram of the adjustment device of the multi-functional knife sharpener according to an embodiment of the present invention.

[0021] Figure 4 This is an exploded view of the adjustment device of the multifunctional knife sharpener according to an embodiment of the present invention.

[0022] Figure 5This is a schematic diagram of the multi-functional knife sharpener of this utility model with the cover plate in the open state. Detailed Implementation

[0023] The accompanying drawings are for illustrative purposes only and should not be construed as limiting this patent. To better illustrate this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting this patent.

[0024] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "long," and "short" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0025] The technical solution of this utility model will be further described in detail below through specific embodiments and with reference to the accompanying drawings:

[0026] Example 1

[0027] like Figure 1-4 As shown, this embodiment provides a multi-functional knife sharpening machine, including a frame 1, a grinding mechanism mounted on the frame 1, and a motor 3. The grinding mechanism includes a driving wheel 21 and a driven wheel 22 rotatably connected to the frame 1, and a grinding belt 23 fitted on the outside of the driving wheel 21 and the driven wheel 22. The shaft of the motor 3 is drivenly connected to the driving wheel 21. The multi-functional knife sharpening machine also includes an adjustment device 4, which includes a first rotating block 41 rotatably connected to the frame 1, a handle 42 connected to the first rotating block 41, and an elastic telescopic rod 43. The rear end of the elastic telescopic rod 43 is rotatably connected to the frame 1, and the front end of the elastic telescopic rod 43 is rotatably connected to the outside of the free end of the first rotating block 41. The driven wheel 22 is connected to the first rotating block 41 through a first rotating shaft 221 so that the driven wheel 22 can rotate around the first rotating shaft 221. The rotation axis of the first rotating block 41 is parallel to the rotation axis of the driven wheel 22.

[0028] When using the sharpening machine in this embodiment, if it is necessary to replace the grinding belt 23, the handle 42 can be turned to drive the first rotating block 41 to rotate backward. When the first rotating block 41 rotates backward, it will compress the elastic telescopic rod 43, so that the elastic telescopic rod 43 provides elastic support and buffering effect for the first rotating block 41. When the first rotating block 41 rotates backward, it will drive the driven rotating wheel 22 to swing backward and move closer to the driving rotating wheel 21 through the first rotating shaft 221, thereby reducing the distance between the driven rotating wheel 22 and the driving rotating wheel 21. In this way, the old grinding belt 23 can be easily removed from the outside of the two rotating wheels. Then, the new grinding belt 23 is put on the outside of the two rotating wheels, and the handle 42 is released. At this time, the elastic telescopic rod 43 will automatically push the first rotating block 41 to rotate forward and reset, thereby driving the driven rotating wheel 22 to reset. At this time, the distance between the driven rotating wheel 22 and the driving rotating wheel 21 is restored and the new grinding belt 23 is pressed against it. In this way, the replacement operation of the grinding belt 23 can be completed, which is convenient. Since the elastic telescopic rod 43 always provides a forward rotational thrust to the first rotating block 41, it can ensure that the grinding belt 23 is always kept in a taut state, so that the grinding belt 23 is not easy to detach from the rotating wheel during operation and has a better grinding effect.

[0029] As a preferred embodiment, the aforementioned elastic telescopic rod 43 is a nitrogen spring. Nitrogen springs have high elasticity and stable elasticity, which can satisfy the tensioning effect on the grinding belt 23 and provide stable buffering against impacts generated during operation. Since nitrogen springs are an existing structure, they will not be described in detail here. The aforementioned grinding belt 23 is an abrasive belt, which has a better grinding effect and a better effect on the grinding and repair of tool edges.

[0030] Example 2

[0031] This embodiment is a further improvement on the structure of the multi-functional knife sharpening machine in Embodiment 1. The improvement lies in, for example... Figure 1 , 3 As shown in Figure 4, the aforementioned adjustment device further includes a second rotating block 44 rotatably connected to the first rotating block 41, and a screw 45 threadedly connected to the second rotating block 44. The first rotating shaft 221 is connected to the second rotating block 44, and the inner end of the screw 45 abuts against the side wall of the frame 1. Rotating the screw 45 will cause the screw 45 to move relative to the second rotating block 44. The rotation axis of the first rotating block 41 is perpendicular to the rotation axis of the second rotating block 44. The outer end of the screw 45 is provided with a handle 451, which allows for convenient rotation of the screw 45.

[0032] During the grinding process, the driven wheel 22, under the constant tension of the grinding belt 23, is prone to misalignment, causing it to lose parallelism with the driving wheel 21 and affecting the normal operation of the grinding belt 23. When the driven wheel 22 loses parallelism with the driving wheel 21, the user can rotate the handle 451 to move the screw 45 inward relative to the second rotating block 44. Since the inner end of the screw 45 is already against the side wall of the frame 1, continuing to rotate the handle 451 will not move the screw 45 but will cause the second rotating block 44 to rotate to the right around its rotation axis. This will simultaneously drive the first rotating shaft 221 and the driven wheel 22 to rotate to the right along with the second rotating block 44, thus adjusting the driven wheel 22 to be parallel to the driving wheel 21.

[0033] As an improvement to this embodiment, the first rotating block 41 is threadedly connected to the frame 1 by a bolt 411. The first rotating block 41 can rotate relative to the frame 1 with the bolt 411 as the rotation axis. The outer end of the bolt 411 has a nut 412. A limiting block 46 is provided on the outer side of the first rotating block 41. The limiting block 46 has a limiting groove corresponding to the position of the nut 412, which cooperates with the nut 412. The nut 412 is installed in the limiting groove of the limiting block 46, so that the limiting block 46 and the nut 412 are kept in a synchronous state. The limiting block 46 also has a relief groove 460. A screw 47 passes through the relief groove 460 and is threadedly connected to the first rotating block 41. The head 471 of the screw 47 abuts against the outer side of the limiting block 46. This solution provides a clearance groove 460 on the limiting block 46. When the bolt 411 rotates around the first rotating block 41, the limiting block 46 rotates synchronously with the bolt 411. During this process, the screw 47 slides relative to the bolt 411 along the clearance groove 460. When the screw 47 is tightened, the head of the screw 47 is pressed against the limiting block 46, which is equivalent to the limiting block 46 being fixed to the outside of the first rotating block 41 by the screw 47. In this state, the screw 47 and the clearance groove 46 will not slide relative to each other, and the bolt 411 will not rotate relative to the first rotating block 41, thereby preventing the bolt 411 from loosening and improving the stability of the structure. Furthermore, when the screw is tightened, when the handle 42 is turned to rotate the first rotating block 41 backward, the limiting block 46 rotates the bolt 411 in the loosening direction through the nut 412, creating a gap between the contact surface of the first rotating block 41 and the frame 1. This makes the backward rotation of the first rotating block 41 easier and smoother. When the nitrogen spring pushes the first rotating block 41 to rotate forward and reset, the limiting block 46 rotates the bolt 411 in the tightening direction through the nut 412, restoring the contact surface between the first rotating block 41 and the frame 1 to a close fit. This ensures the installation stability of the first rotating block 41 and the frame 1.

[0034] Example 3

[0035] This embodiment is a further improvement on the structure of the multi-functional knife sharpening machine in Embodiment 2. The improvement is as follows: Figure 5 As shown, the aforementioned multi-functional knife sharpening machine also includes a grinding wheel 5 rotatably connected to the frame 1. The grinding wheel 5 is preferably a sisal wheel, a leather wheel, or a nylon wheel. These materials have low hardness, allowing them to remove burrs from the knife surface without wearing down the blade. The shaft of the grinding wheel 5 is connected to a first gear 51, the shaft of the drive wheel 21 is connected to a second gear 211, and the shaft of the motor 3 is connected to a drive gear 31. The drive gear 31 is connected to the first gear 211 and the second gear 51 via a toothed belt 6. This allows one motor 3 to drive the grinding belt 23 and the grinding wheel 5 simultaneously, reducing the number of motors required and making the knife sharpening machine smaller while saving electricity.

[0036] The aforementioned frame 1 is rotatably connected to an auxiliary gear 61 that meshes with the toothed belt 6, thereby making the installation of the toothed belt 6 more stable and improving the transmission stability between the toothed belt 6 and the gears. Specifically, the first gear 51, the auxiliary gear 61, and the drive gear 31 are located inside the toothed belt 6, while the second gear 211 is located outside the toothed belt 6. This allows the first gear 51 and the second gear 211 to rotate in opposite directions. Specifically, the grinding belt 23 can be configured to rotate backward, while the grinding wheel 5 can be configured to rotate forward. Thus, when using the grinding belt 23 and the grinding wheel 5 to grind the tool, the grinding debris ejected from the tool will be ejected in the opposite direction to the user, making it safer to use.

[0037] When using the sharpening machine in this embodiment, the motor 3 can be turned on to drive the grinding belt 23 and the grinding wheel 5 to rotate. Then, the chipped edge of the knife can be repaired by grinding the grinding belt 23. After the grinding belt 23 has finished grinding and repairing the chipped edge, there will generally be burrs and other dirt remaining on the surface of the blade after grinding by the grinding belt 23. Then, the knife can be ground by the grinding wheel 5 to remove the dirt from the surface of the blade, making the surface of the blade smoother, thereby completing the repair operation of the chipped edge of the knife.

[0038] As an improvement to this embodiment, such as Figure 1 , 5 As shown, the frame 1 is provided with a protective cover 52 with an opening 520 on the outer side of the grinding wheel 5. A cover plate 521 is rotatably connected to the inner side of the protective cover 52. The cover plate 521 can rotate relative to the protective cover 52 to open and close the opening 520. When the cover plate 521 is rotated open, the user can use the grinding wheel 5 to grind the tool through the opening 520. When the cover plate 521 is rotated closed, the protective cover 52 and the cover plate 521 can completely cover the grinding wheel 5 to prevent dust from entering and to prevent the user from accidentally touching the grinding wheel 5, making it safer to use.

[0039] like Figure 2As shown, the frame 1 is equipped with a support plate 11 on the upper inner side of the grinding belt 23, with the upper surface of the support plate 11 facing the upper inner side of the grinding belt 23. During the sharpening operation, the blade exerts downward pressure on the grinding belt 23, and the support plate 11 provides support for the grinding belt 23, resulting in better contact between the grinding belt 23 and the blade, thus improving the sharpening effect. The support plate 11 has a sliding groove 110, and an adjusting screw 111 passes through the sliding groove 110 and is threadedly connected to the frame 1. In use, when the adjusting screw 111 is tightened, the head of the adjusting screw 111 locks the support plate 11, preventing it from moving up and down. When the adjusting screw 111 is loosened, the support plate 11 can move up and down along the adjusting screw 111 through its sliding groove 110, thereby adjusting the height of the support plate 11 and the gap between the support plate 11 and the grinding belt 23.

[0040] The sharpening machine in this embodiment also includes a control panel, through which the speed of the motor 3 can be adjusted to meet various speed requirements of the grinding belt during sharpening. In addition, a water spraying device is also provided on the frame 1. During the sharpening of the tool, the water spraying device can spray water onto the grinding belt 23 and the tool to cool them, and at the same time, it can wash away the grinding debris in time to improve the sharpening effect.

[0041] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A multi-functional knife sharpening machine, comprising a frame (1), a grinding mechanism mounted on the frame (1), and a motor (3), wherein the grinding mechanism comprises a driving wheel (21), a driven wheel (22), and a grinding belt (23) mounted on the frame (1), and a grinding belt (23) fitted around the outer sides of the driving wheel (21) and the driven wheel (22), and the shaft of the motor (3) is connected to the driving wheel (21) via a transmission connection, characterized in that: It also includes an adjustment device (4), which includes a first rotating block (41) rotatably connected to the frame (1), a handle (42) connected to the first rotating block (41), and an elastic telescopic rod (43). The rear end of the elastic telescopic rod (43) is rotatably connected to the frame (1), and the front end of the elastic telescopic rod (43) is rotatably connected to the first rotating block (41). The driven rotating wheel (22) is connected to the first rotating block (41) through the first rotating shaft (221). The rotation axis of the first rotating block (41) is parallel to the rotation axis of the driven rotating wheel (22).

2. The multi-functional knife sharpening machine according to claim 1, characterized in that: The elastic telescopic rod (43) is a nitrogen spring.

3. The multi-functional knife sharpening machine according to claim 1, characterized in that: The adjustment device (4) further includes a second rotating block (44) rotatably connected to the first rotating block (41) and a screw (45) threadedly connected to the second rotating block (44). The first rotating shaft (221) is connected to the second rotating block (44). The inner end of the screw (45) abuts against the side wall of the frame (1). Rotating the screw (45) will cause the screw (45) to move relative to the second rotating block (44). The rotation axis of the first rotating block (41) is perpendicular to the rotation axis of the second rotating block (44).

4. The multi-functional knife sharpening machine according to claim 3, characterized in that: The screw (45) is provided with a handle (451) at its outer end.

5. The multi-functional knife sharpening machine according to claim 1, characterized in that: The first rotating block (41) is threadedly connected to the frame (1) by a bolt (411). The first rotating block (41) can rotate relative to the frame (1) with the bolt (411) as the rotation axis. The outer end of the bolt (411) has a nut (412). The outer side of the first rotating block (41) is provided with a limiting block (46). The limiting block (46) is provided with a limiting groove corresponding to the position of the nut (412) to cooperate with the nut (412). The limiting block (46) is also provided with a relief groove (460). A screw (47) passes through the relief groove (460) and is threadedly connected to the first rotating block (41). The screw head (471) of the screw (47) abuts against the outer side of the limiting block (46).

6. The multi-functional knife sharpening machine according to any one of claims 1-5, characterized in that: It also includes a grinding wheel (5) rotatably connected to the frame (1), the shaft of the grinding wheel (5) is connected to a first gear (51), the shaft of the drive wheel (21) is connected to a second gear (211), the shaft of the motor (3) is connected to a drive gear (31), and the drive gear (31) is connected to the first gear (51) and the second gear (211) via a toothed belt (6).

7. The multi-functional knife sharpening machine according to claim 6, characterized in that: The frame (1) is rotatably connected to an auxiliary gear (61) that meshes with the toothed belt (6), wherein the first gear (51), the auxiliary gear (61) and the drive gear (31) are located inside the toothed belt (6), and the second gear (211) is located outside the toothed belt (6).

8. The multi-functional knife sharpening machine according to claim 6, characterized in that: The frame (1) is provided with a protective cover (52) with an opening (520) on the outside of the grinding wheel (5). A cover plate (521) is rotatably connected to the inside of the protective cover (52). The cover plate (521) can rotate relative to the protective cover (52) to open and close the opening (520).

9. The multi-functional knife sharpening machine according to claim 6, characterized in that: The frame (1) is provided with a support plate (11) on the upper inner side of the grinding belt (23), and the upper surface of the support plate (11) is opposite to the upper inner side of the grinding belt (23).

10. The multi-functional knife sharpening machine according to claim 9, characterized in that: The support plate (11) has a sliding groove (110), and an adjusting screw (111) passes through the sliding groove (110) and is threadedly connected to the frame (1).

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