Dual-purpose semi-automatic tool sharpener

Abstract

The utility model provides a dual-purpose semi-automatic tool sharpener which comprises a frame, an abrasive belt grinding mechanism, a millstone grinding mechanism and a water tank are installed on the frame, a driving shaft and a tensioning shaft are arranged on the frame in parallel, a grinding abrasive belt is wound on the driving shaft and the tensioning shaft, one side of the driving shaft extends outwards and is provided with a driven chain wheel, and the other side of the driving shaft is provided with a driven chain wheel. A motor is installed on the frame, a driving chain wheel is installed on an output shaft of the motor, the driving chain wheel and a driven chain wheel are in transmission through a chain, the millstone polishing mechanism is installed on the side face of the frame, a sliding groove is fixedly formed in the position, on one side of the chain wheel, of the frame, and a sliding block is installed in the sliding groove and protrudes out of a strip-shaped hole to form a protruding shaft. An eccentric shaft is arranged on the outer side face of the driven chain wheel, and a driving rod is installed between the eccentric shaft and the protruding shaft. According to the dual-purpose semi-automatic tool sharpener, an abrasive belt grinding system and a grinding stone grinding system are integrated, the water tank is arranged in the dual-purpose semi-automatic tool sharpener to achieve wet grinding, the tool sharpening efficiency is remarkably improved, and a blade is protected.

Description

Technical Field

[0001] This utility model relates to the field of tool grinding technology, and in particular to a dual-purpose semi-automatic tool grinding machine. Background Technology

[0002] A kitchen knife is one of the most basic and indispensable tools in a family kitchen, directly affecting the efficiency of food preparation and the quality of cooking. However, frequent cutting quickly dulls the blade. A dull knife requires more force to cut and is prone to slipping, leading to hand injuries. Therefore, keeping a kitchen knife sharp is crucial for kitchen safety. A sharp blade ensures that food is cut cleanly and efficiently, reducing damage to cell walls and helping to preserve nutrients and freshness, which is beneficial for family dietary health.

[0003] However, for individuals at home, sharpening a dull knife is quite difficult. Personal sharpening, lacking professional skills, can lead to improper blade angles, uneven sharpening, or over-sharpening, affecting the knife's lifespan and cutting performance. Using unsuitable sharpening tools, such as an unsuitable whetstone or the wrong type (e.g., using a coarse whetstone instead of a fine one), will also affect the sharpening effect. Family members unfamiliar with the sharpening process and safety precautions may injure their fingers or cause other accidents while sharpening. In short, for inexperienced individuals, sharpening a knife can be a time-consuming and laborious process, especially without proper techniques. Therefore, many areas have shops or mobile knife sharpeners offering professional sharpening services. These skilled individuals use specialized equipment and techniques to provide knife sharpening services, ensuring knives are restored to near-factory sharpness, extending their lifespan, and enhancing the cooking experience.

[0004] Professional knife sharpeners are typically equipped with advanced sharpening machines and various whetstones, enabling them to precisely control the sharpening angle and force for different types of knives (such as kitchen knives, scissors, gardening tools, etc.) and materials, achieving the best sharpening results. However, existing knife sharpening machines either use belt abrasion or whetstones, resulting in a limited range of sharpening methods and low automation. Utility Model Content

[0005] To address the aforementioned problems, this utility model provides a dual-purpose semi-automatic knife sharpening machine that combines both belt grinding and whetstone grinding structures.

[0006] The solution adopted by this utility model to solve its technical problem is: a dual-purpose semi-automatic knife sharpening machine, including a frame, on which a belt grinding mechanism, a whetstone grinding mechanism and a water tank are installed. A drive shaft and a tension shaft are arranged in parallel on the frame. A grinding belt is wound on the drive shaft and the tension shaft. One side of the drive shaft extends outward and is equipped with a driven sprocket. A motor is installed on the frame. A drive sprocket is installed on the output shaft of the motor. The drive sprocket and the driven sprocket are driven by a chain. A support rod is fixed on the frame on the side of the grinding belt. A belt grinding clamp is fixed on the support rod. The belt grinding clamp is used to hold the knife so that the blade of the knife is located on the grinding belt and receives grinding from the grinding belt.

[0007] A water tank bracket is installed at the rear of the frame, and a suspension rod is installed on the water tank bracket. The water tank is placed on the water tank bracket and connected to a water pipe. The water pipe is fixed to the suspension rod and extends to the top of the sanding belt. A horizontal water spray bar is installed at the end of the water pipe located above the sanding belt. The water spray bar is perpendicular to the rotation direction of the sanding belt. The water in the water tank flows through the water pipe to the water spray bar by its own weight and is then sprayed onto the sanding blade.

[0008] The grinding mechanism is installed on the side of the frame. The grinding mechanism includes a groove, a slider, a grinding stone, and a grinding fixture. The groove is fixed on the frame on one side of the sprocket. The slider is installed in the groove. A strip hole is provided on the side of the groove. A convex shaft protrudes from the strip hole of the slider. An eccentric shaft is provided on the outer side of the driven sprocket. A drive rod is installed between the eccentric shaft and the convex shaft. Bushings are provided at both ends of the drive rod. The two ends of the drive rod are respectively fitted onto the corresponding eccentric shaft and convex shaft through the bushings. The grinding stone is fixed on the slider. The grinding fixture is set on the side of the groove. The blade is fixed by the grinding fixture so that the blade edge is located on the grinding stone.

[0009] Furthermore, the tensioning shaft is movably mounted on the frame, and both ends of the tensioning shaft are mounted on the frame through tensioning shaft seats. The tensioning shaft seats are provided with through holes, and flat holes are provided on the frame at positions corresponding to the through holes of the tensioning shaft seats. The tensioning shaft seats are mounted on the flat holes by bolts, and the wound abrasive belt is tightened by adjusting the position of the tensioning shaft seats on the flat holes.

[0010] Furthermore, a vertical support rod is fixed on the frame, and a U-shaped component is fixed on the support rod. The U-shaped component is vertically positioned so that the U-shaped groove of the U-shaped component can face the sanding belt. A baffle is fixed at the opening of the U-shaped groove, and a screw hole is provided on the baffle. A locking screw is fitted into the screw hole, and an arc-shaped retaining plate is provided at the end of the locking screw located inside the U-shaped groove.

[0011] Furthermore, the grinding stone fixture includes a right-angle mounting base. The vertical plate of the right-angle mounting base is fixed to the frame, and its horizontal plate is parallel to the frame. A lateral adjustment mechanism is installed on the horizontal plate of the right-angle mounting base. A vertical sleeve is provided on the lateral adjustment mechanism, and a locking screw is provided on the side wall of the sleeve. A rotating column is fitted inside the sleeve, and a sliding sleeve that runs vertically through the rotating column is fixed horizontally. A locking screw is provided on the side of the sliding sleeve, and a C-shaped plate is fitted inside the sliding sleeve. The upper and lower ends of the C-shaped plate extend horizontally, and a screw hole is provided on the upper extension. A screw rod is fitted into the screw hole, and a pressure plate is provided at the lower end of the screw rod. The handle of the kitchen knife is inserted into the middle of the C-shaped plate, and the handle of the kitchen knife is clamped in the middle of the C-shaped plate by rotating the screw rod.

[0012] Furthermore, the lateral adjustment mechanism adopts a lead screw mechanism, with a sleeve fixed in the nut seat of the lead screw mechanism.

[0013] Furthermore, a guide rod is connected to the end of the tensioning shaft facing the outside of the sanding belt. A guide sleeve is fitted on the outside of the guide rod and fixed to the frame. A tension spring is connected to the other end of the guide rod. A hanging ring is provided on the outer end of the tension spring. A hook is fixed on the frame and is located on the straight line of the extension of the guide rod. By hanging the hanging ring on the hook, the tension spring is stretched, thereby effectively tightening the corresponding tensioning shaft and ensuring that the sanding belt is taut and unfolded.

[0014] The beneficial effects of this utility model are as follows: This utility model provides a dual-purpose semi-automatic knife sharpening machine that integrates both belt abrasive and whetstone sharpening systems, and has a built-in water tank for wet sharpening, significantly improving sharpening efficiency and protecting the blade. The sharpening machine integrates belt abrasive and whetstone sharpening methods, allowing for flexible selection of the most suitable sharpening mode according to different knife types and sharpening needs. It can efficiently complete coarse and fine sharpening, and also perform fine grinding on knives made of special materials, greatly improving sharpening efficiency and applicability. The semi-automatic design retains the flexibility of manual operation while reducing manpower consumption through a motor-driven automated system, making the sharpening process easier and faster.

[0015] The tensioning shaft structure and drive device make it simple and quick to replace consumables such as sanding belts, reducing maintenance costs and time, and improving the continuous operation capability of the equipment. The frame structure is reasonably designed, which not only integrates all key components, but also takes into account the ease of movement of the equipment. The equipped wheel frame and support legs make the machine easy to place and move on the work site, adapting to different working environments. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0017] Figure 2 This is a schematic diagram of the overall structure from another angle.

[0018] Figure 3This is a side view of the structure of this utility model.

[0019] Figure 4 yes Figure 3 Enlarged view of section A.

[0020] Figure 5 This is a schematic diagram of the grinding stone fixture.

[0021] Figure 6 This is a structural diagram of the grinding stone fixture from another angle.

[0022] Figure 7 This is a cross-sectional structural diagram of a grinding stone fixture.

[0023] Figure 8 This is a schematic diagram of the belt sanding mechanism.

[0024] Numbered components in the diagram: 1. Frame; 2. Belt sander; 3. Grinding stone sander; 4. Water tank; 5. Motor; 6. Reinforcing column; 11. Handlebar; 12. Controller; 13. Water tank bracket; 14. Suspension rod; 41. Water hose; 42. Water spray bar; 21. Sanding belt; 22. Drive shaft; 23. Tensioning shaft; 24. Driven sprocket; 25. Eccentric shaft; 26. Drive rod; 27. Support rod; 28. Belt sander fixture; 31. Slide groove; 32. Cam shaft; 33. Slider; 34. Grinding stone; 5. Grinding stone grinding wheel. Grinding fixture 35, drive sprocket 51, U-shaped part 281, baffle 282, locking screw 283, arc-shaped clamping plate 284, right-angle mounting base 351, adjusting hole 352, lateral adjusting mechanism 353, adjusting plate 354, nut seat 355, sleeve 356, rotating column 357, sliding sleeve 358, C-shaped plate 359, tensioning shaft seat 231, guide rod 232, guide sleeve 233, tension spring 234, hanging ring 235, hook 236. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below.

[0026] Example 1: This utility model provides a dual-purpose semi-automatic knife sharpening machine. The knife sharpening machine is equipped with both a belt sharpening mechanism 2 and a whetstone sharpening mechanism 3. Through linkage, it can use both belt and whetstone to sharpen two kitchen knives at the same time, improving the sharpening efficiency. It can also select belt sharpening or whetstone sharpening according to the sharpening needs.

[0027] like Figure 1 and Figure 2 As shown, the dual-purpose semi-automatic knife sharpening machine includes a frame 1, on which a belt grinding mechanism 2 and a whetstone grinding mechanism 3 are installed. A water tank 4 is also installed on the frame 1 to provide water for the grinding process and prevent dry grinding from damaging the knife edge.

[0028] The frame 1 includes a rectangular body. A set of symmetrical wheels is mounted on the rear side of the rectangular body via a wheel frame. A set of symmetrical support legs is fixed to the front end of the rectangular body, and the length of the support legs is less than or equal to the diameter of the wheels. A controller 12 is installed at the front end of the frame 1. The controller 12 controls the power supply of the entire sharpening machine. The controller 12 can be a common electric vehicle ignition switch. The operating speed of the sharpening machine can also be adjusted by rotating the ignition switch.

[0029] A handle 11 is also installed on the side of the frame 1. A mounting base is fixed to the side of the frame 1, and a pin is provided in the middle of the mounting base. A shaft hole is provided at the end of the handle 11, and the handle 11 is mounted on the mounting base through the shaft hole, so that the handle 11 can rotate around the mounting base. When the sharpening machine is working, the handle 11 can be rotated to the side of the frame 1 to avoid affecting the sharpener's operation. When moving the sharpening machine, the handle 11 is rotated to the front of the frame 1, and the sharpening machine is moved by pulling the handle 11.

[0030] A set of parallel rotating shafts is installed above the frame 1. The rotating shafts are divided into a drive shaft 22 and a tensioning shaft 23 according to their functions. The drive shaft 22 is fixed to the frame 1 by a shaft seat, and a driven sprocket 24 is installed on one end of the drive shaft 22. A motor 5 is installed and fixed below the frame 1. A drive sprocket 51 is installed on the output shaft of the motor 5. The drive sprocket 51 and the driven sprocket 24 are driven by a chain. The motor 5 is connected to the controller 12 at the front end of the frame 1 by wires, etc. The controller 12 controls the start and stop of the motor 5. The electric vehicle switch is used as the controller. The electric vehicle switch can control the change of the rotation speed of the motor 5 by rotation, thereby adjusting the operation of the grinding machine.

[0031] A sanding belt 21 is fitted between the drive shaft 22 and the tension shaft 23. The drive shaft 22, tension shaft 23 and sanding belt 21 are driven to rotate by the drive sprocket 51.

[0032] The tensioning shaft 23 is movably mounted on the frame 1. Both ends of the tensioning shaft 23 are mounted on the frame 1 through tensioning shaft seats 231. The tensioning shaft seats 231 are provided with through holes. Flat holes are provided on the frame 1 at the positions corresponding to the through holes of the tensioning shaft seats 231. The tensioning shaft seats 231 are mounted on the flat holes by bolts. The wound abrasive belt 21 is tightened by adjusting the position of the tensioning shaft seats 231 on the flat holes.

[0033] A sanding belt fixture 28 is mounted on the frame 1 on the side of the sanding belt 21, specifically as follows: Figure 3 and Figure 4As shown, a vertical support rod 27 is fixed on the frame 1, and a U-shaped component 281 is fixed on the support rod 27. The U-shaped component 281 is vertically positioned so that the U-shaped groove of the U-shaped component 281 faces the abrasive belt 21. A baffle 282 is fixed at the opening of the U-shaped groove, and a screw hole is provided on the baffle 282. A locking screw 283 is fitted into the screw hole, and an arc-shaped clamping plate 284 is provided at the end of the locking screw 283 located in the U-shaped groove. In use, the handle is inserted between the U-shaped groove 281 and the arc-shaped clamping plate 284. The locking screw 283 is rotated to push the arc-shaped clamping plate 284 towards the bottom of the U-shaped groove 281, thereby clamping the handle in the U-shaped groove 281. The main body of the blade faces the abrasive belt 21, and the blade edge is brought close to the surface of the abrasive belt 21 by adjusting the tilt angle of the blade, thereby sharpening the blade edge through the abrasive belt 21.

[0034] like Figure 1 As shown, a water tank bracket 13 is also provided at the rear end of the frame 1. The water tank bracket 13 includes a supporting side plate and a transverse carrier plate. The side plate is fixed to the rear end of the frame 1, and the carrier plate is fixed on the top of the side plate. The water tank 4 is placed on the carrier plate, and a suspension rod 14 is also provided on the carrier plate. The end of the suspension rod 14 faces the sanding belt 21. A water pipe 41 is fixed on the suspension rod 14. One end of the water pipe 41 is connected to the water tank 4, and the other end extends above the sanding belt 21. Specifically, the water pipe 41 extends above the blade fixed on the sanding belt 21. A transverse water spray bar 42 is installed at the end of the water pipe 41 located above the sanding belt 21. A water discharge hole is provided on the lower side of the water spray bar 42. The water spray bar 42 is parallel to the blade fixed on the sanding belt 21, that is, the water spray bar 42 is perpendicular to the direction of operation of the sanding belt 21. A valve is also installed on the water pipe 41. When in use, the valve is opened, and the water in the water tank 4 flows out naturally under the action of potential energy, and falls onto the blade through the water spray rod 42, so as to supply the blade for sharpening.

[0035] The grinding mechanism 3 is mounted on the frame 1 on the same side as the driven sprocket 24. The grinding mechanism 3 includes a slide groove 31 fixed on the frame 1. A slider 33 is fitted in the slide groove 31. A strip hole is provided on the side of the slide groove 31. At least the side of the slide groove 31 facing away from the frame 1 needs to be provided with a strip hole. The strip hole is parallel to the upper and lower surfaces of the slide groove 31. The upper surface of the slider 33 is higher than the upper side of the slide groove 31. A groove is provided on the upper surface of the slider 33. A grinding stone 34 is installed in the groove. The side of the slider 33 has a protruding cam 32 through a strip hole. The cam 32 faces the outside of the frame 1. An eccentric shaft 25 is provided on the side of the driven sprocket 24 facing the outside of the frame 1. The eccentric shaft 25 is located outside the center of the driven sprocket 24. The cam 32 and the eccentric shaft 25 are connected by a drive rod 26. Specifically, the two ends of the drive rod 26 are respectively provided with bushings. The two ends of the drive rod 26 are respectively fitted onto the cam 32 and the eccentric shaft 25 through the bushings.

[0036] When the driven sprocket 24 rotates, the eccentric shaft 25 moves in a circular motion with the driven sprocket 24, thereby pulling the drive rod 26 to reciprocate and extend, causing the slider 33 in the slide groove 31 to move along the slide groove 31. The whetstone 34 on the slider 33 polishes the blade during the reciprocating motion.

[0037] The grinding mechanism 3 also includes a grinding fixture 35, which is mounted on the frame 1 on the side of the grinding stone 34. The grinding fixture 35 holds a kitchen knife or similar object so that the blade faces the grinding stone 34 and is positioned above the grinding stone 34.

[0038] Example 2: Figure 5-7 As shown, the grinding stone fixture 35 includes a right-angle mounting base 351. The vertical plate of the right-angle mounting base 351 is fixed on the frame 1, and its horizontal plate is parallel to the frame 1. A lateral adjustment mechanism 353 is installed on the horizontal plate of the right-angle mounting base 351. The lateral adjustment mechanism 353 can use a screw mechanism as a lateral movement device. A vertical sleeve 356 is provided on the nut seat of the screw mechanism. A locking wire is provided on the side wall of the sleeve 356. A rotating column 357 is fitted in the sleeve 356. The rotating column 357 can rotate in the sleeve 356, and the rotating column 357 can be fixed by the locking wire on the sleeve 356.

[0039] A sliding sleeve 358 that runs vertically through the rotating column 357 is fixed horizontally. Locking screws are provided on the side of the sliding sleeve 358. A C-shaped plate 359 is fitted inside the sliding sleeve 358. The C-shaped plate 359 can slide in the sliding sleeve 358 and can be fixed by the locking screws.

[0040] The upper and lower ends of the C-shaped plate 359 extend horizontally. A screw hole is provided on the upper extension, and a screw rod is installed in the screw hole. A pressure plate is provided at the lower end of the screw rod. The handle of the kitchen knife is inserted into the middle of the C-shaped plate 359, and the handle of the kitchen knife is clamped in the middle of the C-shaped plate 359 by rotating the screw rod.

[0041] When using the knife, clamp the handle of the knife into the middle of the C-shaped plate 359. First, rotate the rotating column 357 in the sleeve 356 to make the blade of the knife perpendicular to the whetstone 34. Then, fix the rotating column 357 with the locking screw on the sleeve 356. Next, adjust the position of the C-shaped plate 359 in the sliding sleeve 358 to change the tilt angle of the knife so that the knife forms a certain angle with the surface of the whetstone 34. Finally, start the sharpening machine and drive the whetstone 34 to reciprocate to sharpen the blade through the driven sprocket 24.

[0042] The right-angle mounting base 351 adopts a right-angle support structure formed by folding steel sheets. This right-angle mounting base 351 provides support through vertical side plates. Therefore, its upper horizontal plate has a certain degree of elasticity due to the characteristics of the steel sheets. During the sharpening process, by excessively tilting the knife, the blade remains in close contact with the surface of the whetstone 34 under the action of elasticity. During the return of the whetstone 34, the blade can also be slightly lifted under the action of elasticity, preventing excessive damage to the blade during the return process.

[0043] Since the strength of a single vertical side plate is limited, a reinforcing column 6 is also provided between the horizontal plate and the frame 1 to provide support and enhance the load-bearing capacity of the horizontal plate.

[0044] Furthermore, a strip-shaped adjustment hole 352 is provided on the horizontal plate, the adjustment hole 352 being a strip-shaped hole facing the sanding belt 21. An adjustment plate 354 is installed on the horizontal plate, and the adjustment plate 354 is provided with a through hole corresponding to the adjustment hole 352. Bolts are threaded through the through hole and the adjustment hole 352, and the position of the adjustment plate 354 on the right-angle mounting base 351 can be changed by tightening or loosening the bolts. The horizontal adjustment mechanism 353 is fixedly connected to the adjustment plate 354. By changing the position of the adjustment plate 354, the horizontal adjustment mechanism 353, the C-shaped plate 359 installed on it, and the horizontal position of the kitchen knife can be changed. Given the different sizes and widths of kitchen knives, and the limited length and range of movement of the whetstone 34, horizontal adjustment through the adjustment hole 352 is particularly important to ensure that the blade remains above the whetstone 34 during the sharpening process and to avoid potential impact damage when the whetstone 34 moves outside the blade and then returns.

[0045] Example 3: Considering that the sanding belt 21 needs to be replaced regularly, for ease of operation, as follows: Figure 8 As shown, the drive shaft 22 is fixed to the frame 1 by the bearings at both ends, while tension bearings 231 are provided at both ends of the tension shaft 23. The tension bearings 231 are placed on the frame 1 but are not directly fixed.

[0046] A guide rod 232 is connected to the end of the tensioning shaft seat 231 facing outwards from the sanding belt 21. A guide sleeve 233 is fitted onto the outside of the guide rod 232 and is fixed to the frame 1. A tension spring 234 is connected to the other end of the guide rod 232, and a hanging ring 235 is provided at the outer end of the tension spring 234. A hook 236 is fixed on the frame 1 and is located on the straight line extending from the guide rod 232. By hooking the hanging ring 235 onto the hook 236, the tension spring 234 is stretched, thereby effectively tightening the corresponding tensioning shaft seat 231 and ensuring that the sanding belt 21 is taut and unfolded. When the sanding belt 21 needs to be replaced, simply remove the hanging ring 235, and the tensioning shaft 23 can move towards the drive shaft 22, making it easy to remove the old sanding belt 21 and install the new sanding belt. This design greatly simplifies the sanding belt replacement process.

[0047] Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. For example, the frame is configured as a double-sided structure, with a belt sander 2 and a grinding stone sander 3 installed on the upper side of the frame, and a motor installed on the lower layer of the frame with tools placed there; or a toolbox placement area is provided in the empty area of ​​the upper layer of the frame, etc.

Claims

1. A dual-purpose semi-automatic knife sharpening machine, characterized in that, Includes a frame (1), on which a belt sanding mechanism (2), a grinding stone sanding mechanism (3) and a water tank (4) are installed. A drive shaft (22) and a tension shaft (23) are arranged in parallel on the frame (1). A sanding belt (21) is wound on the drive shaft (22) and the tension shaft (23). One side of the drive shaft (22) extends outward and is equipped with a driven sprocket (24). A motor (5) is installed on the frame (1). A drive sprocket (51) is installed on the output shaft of the motor (5). The drive sprocket (51) and the driven sprocket (24) are driven by a chain. A support rod (27) is fixed on the frame (1) on the side of the sanding belt (21). A sanding belt grinding fixture (28) is fixed on the support rod (27). The sanding belt grinding fixture (28) is used to hold the knife so that the blade of the knife is located on the sanding belt (21) and receives the sanding of the sanding belt (21). A water tank frame (13) is provided at the rear end of the frame (1). A suspension rod (14) is provided on the water tank frame (13). The water tank (4) is placed on the water tank frame (13). The water tank (4) is connected to a water pipe (41). The water pipe (41) is fixed on the suspension rod (14) and extends to the top of the sanding belt (21). A horizontal water spray bar (42) is installed at the end of the water pipe (41) located above the sanding belt (21). The water spray bar (42) is perpendicular to the rotation direction of the sanding belt (21). The water in the water tank (4) flows through the water pipe (41) to the water spray bar (42) by its own weight, and is sprayed onto the sanding blade by the water spray bar (42). The grinding mechanism (3) is installed on the side of the frame (1). The grinding mechanism (3) includes a groove (31), a slider (33), a grinding stone (34), and a grinding fixture (35). The groove (31) is fixedly installed on the frame (1) on the side of the sprocket. The slider (33) is installed in the groove (31). A strip hole is provided on the side of the groove (31). A convex shaft (32) protrudes from the strip hole of the slider (33). An eccentric shaft is provided on the outer side of the driven sprocket (24). (25) A drive rod (26) is installed between the eccentric shaft (25) and the cam shaft (32). The two ends of the drive rod (26) are respectively provided with bushings. The two ends of the drive rod (26) are respectively fitted onto the corresponding eccentric shaft (25) and cam shaft (32) through bushings. The grinding stone (34) is fixed on the slider (33). The grinding stone polishing fixture (35) is set on the side of the slide groove (31). The knife is fixed by the grinding stone polishing fixture (35) so that the cutting edge of the knife is located on the grinding stone (34).

2. The dual-purpose semi-automatic knife sharpening machine according to claim 1, characterized in that, The tensioning shaft (23) is movably mounted on the frame (1). Both ends of the tensioning shaft (23) are mounted on the frame (1) through tensioning shaft seats (231). The tensioning shaft seats (231) are provided with through holes. Flat holes are provided on the frame (1) at the positions corresponding to the through holes of the tensioning shaft seats (231). The tensioning shaft seats (231) are mounted on the flat holes by bolts. The abrasive belt (21) is tightened by adjusting the position of the tensioning shaft seats (231) on the flat holes.

3. The dual-purpose semi-automatic knife sharpening machine according to claim 1, characterized in that, A vertical support rod (27) is fixed on the frame (1). A U-shaped part (281) is fixed on the support rod (27). The U-shaped part (281) is set vertically so that the U-shaped groove of the U-shaped part (281) can face the sanding belt (21). A baffle (282) is fixed at the opening of the U-shaped groove. A screw hole is provided on the baffle (282). A locking screw (283) is fitted in the screw hole. An arc-shaped clamping plate (284) is provided at the end of the locking screw (283) located in the U-shaped groove.

4. The dual-purpose semi-automatic knife sharpening machine according to claim 1, characterized in that, The grinding fixture (35) includes a right-angle mounting base (351), the vertical plate of which is fixed to the frame (1), and its horizontal plate is parallel to the frame (1). A lateral adjustment mechanism (353) is mounted on the horizontal plate of the right-angle mounting base (351). A vertical sleeve (356) is provided on the lateral adjustment mechanism (353). A locking screw is provided on the side wall of the sleeve (356). A rotating column (357) is fitted inside the sleeve (356). A sliding sleeve (358) that runs vertically through the rotating column (357) is fixed horizontally. A locking screw is provided on the side of the sliding sleeve (358). A C-shaped plate (359) is fitted inside the sliding sleeve (358). The upper and lower ends of the C-shaped plate (359) extend horizontally. A screw hole is provided on the upper extension. A screw rod is fitted in the screw hole. A pressure plate is provided at the lower end of the screw rod. The handle of the kitchen knife is inserted into the middle of the C-shaped plate (359). The handle of the kitchen knife is clamped in the middle of the C-shaped plate (359) by rotating the screw rod.

5. The dual-purpose semi-automatic knife sharpening machine according to claim 4, characterized in that, The lateral adjustment mechanism (353) adopts a lead screw mechanism, and the sleeve (356) is fixed in the nut seat (355) of the lead screw mechanism.

6. The dual-purpose semi-automatic knife sharpening machine according to claim 1, characterized in that, The end of the tensioning shaft seat (231) facing the outside of the sanding belt (21) is connected to a guide rod (232). A guide sleeve (233) is fitted on the outside of the guide rod (232). The guide sleeve (233) is fixed on the frame (1). The other end of the guide rod (232) is connected to a tension spring (234). A hanging ring (235) is provided on the outer end of the tension spring (234). A hook (236) is fixed on the frame (1). The hook (236) is on the straight line extending from the guide rod (232). By hanging the hanging ring (235) on the hook (236), the tension spring (234) is stretched, thereby effectively tightening the corresponding tensioning shaft seat (231) and ensuring that the sanding belt (21) is taut and unfolded.

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