A rotary pull-out type electric sharpener with replaceable sharpening element

Abstract

The utility model provides a rotatable pull type electric sharpener of replacing whetted member, whetted assembly sets up in the rear end of the inner chamber of casing, the inner chamber fixed mounting of casing has a fixed ring, the front end rotatable pull of whetted assembly is embedded to the fixed ring realizes fixed, and the rear end of casing is provided with the dismounting mouth. The utility model provides rotatable pull type electric sharpener of replacing whetted member, whetted assembly is installed in the inside of casing through the mode of rotation pull, can take out whetted assembly through the mode of rotation pull first, and whetted assembly is installed fixed through the mode of rotation first again, can easily realize the replacement of whetted assembly, can replace the whetted assembly of different material whetted disc group according to need, satisfy the sharpening demand of different cutlery, also can directly replace new whetted assembly under the condition of long time use whetted disc group wear, prolong the service life of sharpener, more practical.

Description

Technical Field

[0001] This utility model relates to the field of knife sharpeners, and more particularly to an electric knife sharpener with a rotatable, pull-out design for changing sharpening parts. Background Technology

[0002] Knives are an essential tool in every household kitchen. With societal development, people have higher demands for kitchen tools. For knives, which are used almost daily, knife sharpeners are widely known. Due to daily use, knife blades wear down, becoming dull, making regular sharpening essential.

[0003] Currently, most knife sharpeners on the market do not have replaceable sharpening discs. This means that after prolonged use, when the sharpening disc is severely worn, the sharpener must be discarded and cannot be reused by replacing the sharpening blades. Furthermore, since the sharpening disc cannot be replaced, the material cannot be changed. And since there are many different types of knives, using only one or a few types of sharpening discs may not meet the sharpening needs of different knives, resulting in some shortcomings in use.

[0004] Therefore, it is necessary to provide an electric sharpener with a rotatable, pull-out design for changing the sharpening tool parts to solve the above-mentioned technical problems. Utility Model Content

[0005] This utility model provides an electric knife sharpener with a rotatable and pull-out replaceable sharpening disc, which solves the problems of existing knife sharpeners that cannot replace the sharpening disc, and that after the sharpening disc is severely worn, the knife sharpener can only be discarded and cannot be reused by replacing the sharpening blades. Furthermore, fixing one or a few sharpening discs may not meet the sharpening needs of different knives.

[0006] To solve the above-mentioned technical problems, the present invention provides an electric knife sharpener with a rotatable and pull-out replaceable sharpening component, which includes a housing and a sharpening assembly. The top of the housing has a sharpening opening, and the sharpening assembly is disposed at the rear end of the inner cavity of the housing. The sharpening assembly includes a cylindrical outer shell formed by assembling an upper cover and a lower cover. The inner cavity of the cylindrical outer shell is rotatably provided with a rotating shaft distributed along its axial direction. Multiple sharpening discs are spaced apart on the surface of the rotating shaft. The upper cover has sharpening openings corresponding to the multiple sharpening discs. When the sharpening assembly is installed in place, the sharpening openings are opposite to the sharpening openings. A fixing ring is fixedly installed in the inner cavity of the housing. The front end of the cylindrical housing can be rotatably pulled into the fixing ring for fixation. A disassembly port for disassembling and assembling the grinding tool assembly is opened at the rear end of the housing. A drive motor is provided at the front end of the inner cavity of the housing. When the sharpening assembly is installed in place, the rotating shaft can be driven by the drive motor to rotate and drive multiple sets of sharpening discs to rotate.

[0007] Preferably, the housing is assembled sequentially from an upper housing, a lower housing, and a frame-shaped intermediate frame between them, with the sharpening blade opening located at the top of the upper housing and the disassembly / reassembly port located at the rear end of the upper housing.

[0008] Preferably, the output shaft of the drive motor is fixedly connected to an active claw, and the front end of the rotating shaft extends to the front end of the cylindrical housing and is fixedly connected to a driven clamp that can engage with the active claw. When the driven clamp engages with the active claw, the rotating shaft can be driven to rotate by the drive motor.

[0009] Preferably, the inner wall of the fixing ring is provided with an L-shaped groove extending to the rear end face, the front end of the cylindrical shell is provided with a snap-fit ​​block that matches the cross-sectional size of the L-shaped groove, and the rear end of the cylindrical shell is fixedly connected with a torsion block, through which the cylindrical shell is pulled and twisted.

[0010] Preferably, the surface of the lower cover is provided with an elastic retaining bead, and the bottom of the inner wall of the lower housing is provided with a matching retaining bead positioning hole. When the grinding tool assembly is installed in place, the elastic retaining bead is engaged in the retaining bead positioning hole.

[0011] Preferably, each set of the grinding discs includes two grinding discs facing opposite directions, the two grinding discs being slidably disposed on the rotating shaft along the axial direction of the rotating shaft, and a spring being disposed between the two grinding discs.

[0012] Preferably, each grinding disc consists of a grinding disc holder, a grinding disc pressure ring, and a grinding disc. The grinding disc is fixed to the grinding disc holder by the grinding disc pressure ring. The disc can be assembled by various methods such as ultrasonic bonding, adhesive bonding, or thermal fusion bonding.

[0013] Preferably, the grinding disc can be a flexible grinding material or a rigid grinding material. The flexible grinding material refers to flexible grinding discs such as abrasive belts, PET ceramic abrasive discs, and microcrystalline pyramid abrasive discs, while the rigid grinding material refers to diamond or hard ceramic grinding blades.

[0014] Preferably, it also includes a cover that can block the disassembly port, the top of the inner side of the cover is provided with a guide buckle, the bottom of the cover is provided with an elastic buckle, the top of the upper housing is provided with a guide buckle hole adapted to the guide buckle, and the rear end of the middle frame is provided with a buckle position adapted to the elastic buckle.

[0015] Preferably, it further includes a guide assembly, the guide assembly including a guide cover fixedly connected to the inner cavity of the housing and covering the grinding assembly, the top of the guide cover having a plurality of grinding grooves corresponding one-to-one with the grinding mouth for exposure, guide blocks being provided at both ends of the top of the guide cover and between every two groups of adjacent grinding discs, the two side surfaces of the guide blocks forming inclined surfaces to support the cutting tool, a support block being provided at the top of the guide cover and between two adjacent guide blocks, the two sides of the support block being respectively provided with spring pieces to press the cutting tool against the surface of the guide block, and a grinding guide groove being formed between the support block and the opposite guide block.

[0016] Compared with related technologies, the electric knife sharpener with a rotatable pull-out type for changing sharpening parts provided by this utility model has the following advantages: This utility model provides an electric knife sharpener with a rotatable, pull-out design for replacing sharpening components. The sharpening assembly is installed inside the housing by rotating and pulling it out. The sharpening assembly can be removed by rotating and then pulling it out, and the replacement sharpening assembly can be installed and fixed by pushing it in and then rotating it. This allows for easy replacement of the sharpening assembly. Sharpening assemblies with different materials can be replaced as needed to meet the sharpening requirements of different knives. Alternatively, when the sharpening disc assembly wears out after prolonged use, a new sharpening assembly can be directly replaced, extending the life of the sharpener and making it more practical. Attached Figure Description

[0017] Figure 1 A schematic diagram of a preferred embodiment of the electric knife sharpener with a rotatable pull-out type for changing sharpening parts provided by this utility model; Figure 2 This is a cross-sectional structural diagram of the present invention; Figure 3 This is an exploded view of the structure of this utility model; Figure 4 This is a schematic diagram of the structure of the grinding tool assembly during disassembly in this utility model; Figure 5 This is a schematic diagram of the structure of the cap in this utility model; Figure 6 This is a schematic diagram of the internal structure of the present invention; Figure 7 This is a schematic diagram of the grinding assembly in this utility model; Figure 8 for Figure 7 The diagram shows an exploded view of the grinding tool assembly. Figure 9 This is a schematic diagram of the grinding disc assembly in this utility model; Figure 10 for Figure 9 The diagram shows the structure of the grinding disc. Figure 11 This is a schematic diagram of the guide component in this utility model.

[0018] The diagram is labeled as follows: 1. Housing; 11. Upper Housing; 12. Lower Housing; 121. Loop Positioning Hole; 13. Anti-slip Pad; 14. Middle Frame; 141. Buckle Position; 15. Disassembly / Removal Port; 16. Sharpening Opening; 17. Guide Buckle Hole; 2. Cover; 21. Guide Buckle; 22. Elastic Buckle; 3. Guide Assembly; 31. Guide Cover; 32. Sharpening Groove; 33. Guide Block; 34. Spring; 4. Sharpening Assembly; 41. Upper Cover; 42. Lower Cover; 43. Rotating Shaft; 44. 441. Grinding disc assembly; 4412. Grinding disc; 4413. Grinding disc retainer; 442. Grinding disc; 443. Grinding disc pressure ring; 4444. Spring; 445. Positioning pin; 46. Grinding edge; 47. Bevel; 48. Grinding groove; 49. Clamping block; 410. Elastic retaining ball; 411. Driven clamp; 5. Driven claw; 52. Claw head silicone sleeve; 6. Pressure cover; 7. Switch button; 8. Retaining ring; 81. L-shaped groove. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] First Embodiment Please refer to the following: Figure 1-8 The electric knife sharpener with a rotatable and pull-out replaceable sharpening component includes a housing 1 and a sharpening assembly 4. The top of the housing 1 has a sharpening opening 16, and the sharpening assembly 4 is located at the rear end of the inner cavity of the housing 1.

[0021] Please refer to Figure 3 The housing 1 is assembled sequentially from an upper housing 11, a lower housing 12, and a frame-shaped intermediate frame 14 between them, and the sharpening opening 16 is located at the top of the upper housing 11.

[0022] The upper housing 11, the lower housing 12, and the intermediate frame 14 can be connected and fixed by bolts or snap-fit ​​to form a complete housing. The front end of the housing is connected to a power line to power the drive motor 5. Alternatively, a built-in battery can be used to replenish power by charging, and the battery can power the drive motor 5.

[0023] A switch button 7 is provided on the surface of the housing 1 for switching on or off or adjusting the speed.

[0024] The sharpening assembly 4 includes a cylindrical outer shell formed by assembling an upper cover 41 and a lower cover 42. A rotating shaft 43 is rotatably arranged in the inner cavity of the cylindrical outer shell along its axial direction. Multiple sharpening discs 44 are spaced apart on the surface of the rotating shaft 43. The upper cover 41 has sharpening openings 45 corresponding to the multiple sharpening discs 44. When the sharpening assembly 4 is installed in place, the sharpening openings 45 are opposite to the sharpening openings 16. The rotating shaft 43 is installed inside the cylindrical housing via bearings, allowing the rotating shaft 43 to rotate relative to the cylindrical housing, thereby driving multiple sets of grinding discs 44 to rotate and achieve the grinding of the cutting tools.

[0025] Each grinding burr 45 has a recessed grinding groove 47 on both sides to accommodate the cutting edge of the tool during grinding. The two ends of the grinding burr 45 form a bevel 46 to guide the tool.

[0026] A fixing ring 8 is fixedly installed in the inner cavity of the housing 1. The front end of the cylindrical outer shell is rotatably and pullably inserted into the fixing ring 8 for fixation. A disassembly and assembly port 15 for disassembling and assembling the grinding tool assembly 4 is opened at the rear end of the housing 1. The disassembly and assembly port 15 is opened at the rear end of the upper housing 11.

[0027] Please refer to Figure 7 and 8 Both the upper cover 41 and the lower cover 42 are semi-cylindrical, and when assembled, they form a complete cylindrical structure. They can be assembled by snap-fit. The outer diameter of the front end of the cylindrical shell is compatible with the inner diameter of the fixing ring 8, and can be installed on the fixing ring 8 by rotation and snap-fit.

[0028] During disassembly and assembly, hold the cylindrical outer shell through the disassembly port 15 and remove it from the retaining ring 8 by twisting and pulling. Then pull it out through the disassembly port 15 and insert the replacement sharpening assembly 4 by reversing the operation to replace the sharpening assembly 4.

[0029] Different sharpening components 4 can have sharpening discs 44 of different materials and forms for users to choose from, which can meet the sharpening needs of different tools.

[0030] A drive motor 5 is provided at the front end of the inner cavity of the housing 1. When the sharpening assembly 4 is installed in place, the rotating shaft 43 can be driven to rotate by the drive motor 5, thereby driving multiple sets of sharpening discs 44 to rotate.

[0031] The lower housing 12 is provided with a mounting position for mounting the drive motor 5, and the drive motor 5 is fixed to the mounting position by the pressure cover 6.

[0032] Please refer to Figure 2 and 3The output shaft of the drive motor 5 is fixedly connected to an active claw head 51. The front end of the rotating shaft 43 extends to the front end of the cylindrical shell and is fixedly connected to a driven clamp head 410 that can engage with the active claw head 51. When the driven clamp head 410 engages with the active claw head 51, the rotating shaft 43 can be driven to rotate by the drive motor 5.

[0033] Both the active claw 51 and the passive claw 410 have toothed end faces that are compatible with each other. During installation, the sharpening assembly 4 can be pushed forward and repeatedly twisted until the passive chuck 410 engages with the active chuck 51. Then, the sharpening assembly 4 can be twisted to the installation position and fixed to achieve transmission. Using this transmission method does not affect the installation and removal of the sharpening assembly 4 and ensures that the drive motor 5 can drive the sharpening assembly 4.

[0034] The surface of the active claw 51 is provided with a claw silicone sleeve 52, which can reduce vibration.

[0035] Please refer to Figure 3 The inner wall of the fixing ring 8 is provided with an L-shaped groove 81 extending to the rear end face. The front end of the cylindrical shell is provided with a snap-fit ​​block 48 that matches the cross-sectional size of the L-shaped groove 81. A torsion block 411 is fixedly connected to the rear end of the cylindrical shell. The torsion block 411 is for hand gripping. The cylindrical shell is pulled and twisted by the torsion block 411.

[0036] The short side of the L-shaped groove 81 is arranged axially on the inner wall of the fixing ring 8 and extends to the rear end face of the fixing ring 8. The long side is arranged along the circumferential surface of the inner wall of the fixing ring 8. When installing the grinding tool assembly 4, the grinding tool assembly is pushed inward so that the locking block 48 enters along the short side of the L-shaped groove 81 and the passive claw 410 engages with the active claw 51. Then the grinding tool assembly 4 is rotated so that the locking block 48 rotates to the end within the long side of the L-shaped groove 81. The locking block 48 is restricted by the L-shaped groove 81 and cannot move outward, which can ensure that the passive claw 410 and the active claw 51 are engaged and connected.

[0037] When it is necessary to disassemble the sharpening assembly 4, first rotate the sharpening assembly 4 in the opposite direction to move the locking block 48 to the short side position of the L-shaped groove 81, and then pull it outward to remove the sharpening assembly 4.

[0038] The surface of the lower cover 42 is provided with an elastic retaining bead 49, and the bottom of the inner wall of the lower housing 12 is provided with a matching retaining bead positioning hole 121. When the grinding tool assembly 4 is installed in place, the elastic retaining bead 49 is engaged in the retaining bead positioning hole 121.

[0039] The L-shaped groove 81 can only restrict the axial direction of the grinding assembly 4, but cannot position it circumferentially. Therefore, an elastic retaining bead 49 and a retaining bead positioning hole 121 are provided separately. When the grinding assembly 4 is inserted inward, the elastic retaining bead 49 is squeezed and retracted. When the grinding assembly 4 is rotated so that the insert block 48 rotates to the innermost end of the long side of the L-shaped groove 81, the elastic retaining bead 49 corresponds exactly to the retaining bead positioning hole 121. The elastic retaining bead 49 pops out and is inserted into the retaining bead positioning hole 121 to fix the grinding assembly 4. When it is necessary to disassemble the grinding assembly 4, it is only necessary to rotate it in the opposite direction to make the elastic retaining bead 49 disengage from the retaining bead positioning hole 121 and retract, so that the grinding assembly can be disassembled.

[0040] Meanwhile, the elastic structure of the elastic ball 49 can also push the sharpening assembly 4 upward to make it more stable during sharpening and avoid vibration caused by excessive installation gap due to the detachable installation method.

[0041] It also includes a cover 2 that can block the disassembly port 15. The top of the inner side of the cover 2 is provided with a guide buckle 21, and the bottom of the cover 2 is provided with an elastic buckle 22. The top of the upper housing 11 is provided with a guide buckle hole 17 that matches the guide buckle 21. The rear end of the middle frame 14 is provided with a buckle position 141 that matches the elastic buckle 22.

[0042] The two guide buckles 21 on the cover 2 mate with the two guide buckle holes 17 on the upper housing 11. Simultaneously, the elastic buckles 22 on the cover 2 snap into the buckle positions 141 of the assembled intermediate frame 14, thus covering the disassembly port 15 and serving a decorative purpose. When it is necessary to replace the grinding tool 4, the cover 2 must be pressed down while simultaneously being pushed upwards to open it. The principle is similar to the structure of a common remote control battery compartment cover and will not be elaborated upon here.

[0043] Second Embodiment Please refer to Figure 9-10 Each grinding disc group 44 includes two grinding discs 441 that are opposite to each other. The two grinding discs 441 are slidably disposed on the rotating shaft 43 along the axial direction of the rotating shaft 43, and a spring 442 is disposed between the two grinding discs 441.

[0044] The grinding disc group 44 can be set up for grinding tools of different materials and roughness. For example, it can be set up in three groups for coarse grinding, fine grinding and fine grinding.

[0045] Each grinding disc 441 consists of a fixed base 4411, a pressure ring 4413, and a grinding blade 4412. The pressure ring 4413 presses down on the edge of the grinding blade 4412 and fixes it to the fixed base 4411. The disc can be assembled using various methods such as ultrasonic bonding, adhesive bonding, or thermal fusion bonding. The grinding blade 4412 can be made of either a flexible or rigid grinding material. Flexible grinding materials include abrasive belts, PET ceramic grinding discs, and microcrystalline pyramid grinding discs, while rigid grinding materials include diamond or hard ceramic grinding blades.

[0046] The fixed sleeve part of the grinding disc 441 shaft has axially distributed pin grooves, and the rotating shaft 43 has corresponding pin holes. The positioning pin 443 is fixed into the pin hole along the pin groove, and the grinding disc 441 is installed on the rotating shaft 43 so that the grinding disc 441 rotates synchronously with the rotating shaft 43. Since the two grinding discs 441 are provided with springs 442, they can move slightly axially and reset on the rotating shaft 43, ensuring full contact between the grinding disc and the cutting edge of the tool, without squeezing too tightly and causing damage to the cutting edge of the tool.

[0047] Third Embodiment Please refer to Figure 3 and 11 It also includes a guide assembly 3, which includes a guide cover 31 fixedly connected to the inner cavity of the housing 1 and covering the grinding assembly 4. The top of the guide cover 31 has a plurality of grinding grooves 32 that correspond one-to-one with the grinding mouth 45 for exposure. Guide blocks 33 are provided at both ends of the top of the guide cover 31 and between every two adjacent grinding disc groups 44. The two side surfaces of the guide blocks 33 form inclined surfaces to support the cutting tools. A support block is provided at the top of the guide cover 31 and between two adjacent guide blocks 33. The two sides of the support block are respectively provided with spring pieces 34 to press the cutting tool against the surface of the guide block 33. A grinding guide groove is formed between the spring pieces 34 and the opposite guide block 33.

[0048] The spring piece 34, the support block, and the guide cover 31 are an integral structure.

[0049] The inclined surface of the guide block 33 forms an inclined groove with the opposite support block. This inclined groove corresponds one-to-one with the grinding groove 32, so that the tool can enter along the inclined groove and the grinding groove 32 to contact the grinding disc 441.

[0050] The guide block 33 includes two specifications: one at both ends and one in the middle. The guide blocks 33 in the middle have bevels on both sides, making them wider at the top and narrower at the bottom. The guide blocks 33 at both ends only have bevels on their inner sides. That is, each bevel is opposite to a grinding disc 441, and the bevel is at an angle to the axis of the rotating shaft 4 and the axis of the grinding disc 441. When sharpening the blade, one side of the blade is supported by the bevel, and the other side forms an angle with the grinding disc 441 for sharpening.

[0051] To ensure the stability of the cutting tool during sharpening, a spring piece 34, which is integrated with the guide cover 31, is provided at the position of the sharpening disc 441 on the guide cover 31. This spring piece 34 can hold the cutting edge against the inclined surface, preventing the cutting edge from swinging or shaking under the force of the sharpening disc 441, thus ensuring the sharpening effect.

[0052] The guide block 33 is a detachable structure with a groove at the bottom and a corresponding protrusion at the top of the guide cover 31, which is installed by snap-fit.

[0053] It also includes an upper cover 9, which is snapped onto the sharpening opening 13 at the top of the housing 1 and has multiple sharpening slots corresponding to the sharpening grooves 32 on its top. The upper cover 9 is made of metal or plastic and is used to seal the sharpening opening 16, covering the sharpening assembly 4 and the guide assembly 3 inside, making it more aesthetically pleasing and safer.

[0054] Compared with related technologies, the electric knife sharpener with a rotatable pull-out type for changing sharpening parts provided by this utility model has the following advantages: The sharpening assembly 4 is installed inside the housing 1 by rotating and pulling. It can be removed by rotating and then pulling, and the replacement sharpening assembly 4 is installed and fixed by pushing it in and then rotating it. This allows for easy replacement of the sharpening assembly 4. Sharpening assemblies 4 with different materials of sharpening disc assemblies 44 can be used as needed to meet the sharpening requirements of different tools. Alternatively, when the sharpening disc assemblies 44 wear down after prolonged use, a new sharpening assembly 4 can be directly replaced, extending the lifespan of the sharpener and making it more practical. The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. An electric knife sharpener with a rotatable, pull-out type for changing sharpening parts, characterized in that: It includes a housing (1) and a sharpening assembly (4), wherein a sharpening opening (16) is provided on the top of the housing (1), and the sharpening assembly (4) is disposed at the rear end of the inner cavity of the housing (1); The sharpening assembly (4) includes a cylindrical shell formed by assembling an upper cover (41) and a lower cover (42). The inner cavity of the cylindrical shell is rotatably provided with a rotating shaft (43) distributed along its axial direction. Multiple sharpening discs (44) are spaced apart on the surface of the rotating shaft (43). The upper cover (41) is provided with sharpening mouths (45) corresponding to the multiple sharpening discs (44). When the sharpening assembly (4) is installed in place, the sharpening mouths (45) are opposite to the sharpening opening (16). A fixing ring (8) is fixedly installed in the inner cavity of the housing (1). The front end of the cylindrical housing can be rotated and pulled into the fixing ring (8) for fixing. A disassembly port (15) for disassembling and assembling the grinding tool assembly (4) is opened at the rear end of the housing (1). A drive motor (5) is provided at the front end of the inner cavity of the housing (1). When the grinding assembly (4) is installed in place, the rotating shaft (43) can be driven by the drive motor (5) to rotate and drive multiple sets of grinding discs (44) to rotate.

2. The electric knife sharpener with a rotatable, pull-out type for changing the sharpening tool as described in claim 1, characterized in that, The housing (1) is assembled sequentially from the upper housing (11), the lower housing (12) and the frame-shaped intermediate frame (14) between them. The sharpening opening (16) is located at the top of the upper housing (11), and the disassembly port (15) is located at the rear end of the upper housing (11).

3. The electric knife sharpener with a rotatable, pull-out type for changing sharpening parts according to claim 1, characterized in that, The output shaft of the drive motor (5) is fixedly connected to an active claw (51). The front end of the rotating shaft (43) extends to the front end of the cylindrical shell and is fixedly connected to a driven chuck (410) that can engage with the active claw (51). When the driven chuck (410) engages with the active claw (51), the rotating shaft (43) can be driven to rotate by the drive motor (5).

4. The electric knife sharpener with a rotatable, pull-out type for changing the sharpening tool as described in claim 2, characterized in that, The inner wall of the fixing ring (8) is provided with an L-shaped groove (81) extending to the rear end face. The front end of the cylindrical shell is provided with a snap-fit ​​block (48) that matches the cross-sectional size of the L-shaped groove (81). The rear end of the cylindrical shell is fixedly connected to a torsion block (411). The cylindrical shell is pulled and twisted by the torsion block (411).

5. The electric knife sharpener with a rotatable, pull-out type for changing the sharpening tool as described in claim 4, characterized in that, The surface of the lower cover (42) is provided with an elastic retaining bead (49), and the bottom of the inner wall of the lower housing (12) is provided with a matching retaining bead positioning hole (121). When the grinding tool assembly (4) is installed in place, the elastic retaining bead (49) is inserted into the retaining bead positioning hole (121).

6. The electric knife sharpener with a rotatable, pull-out type for changing the sharpening tool as described in claim 2, characterized in that, It also includes a cover (2) that can block the disassembly port (15). The top of the inner side of the cover (2) is provided with a guide buckle (21), the bottom of the cover (2) is provided with an elastic buckle (22), the top of the upper housing (11) is provided with a guide buckle hole (17) that matches the guide buckle (21), and the rear end of the middle frame (14) is provided with a buckle position (141) that matches the elastic buckle (22).

7. The electric knife sharpener with a rotatable, pull-out type for changing the sharpening tool as described in claim 1, characterized in that, Each of the grinding disc groups (44) includes two grinding discs (441) facing each other. The two grinding discs (441) are slidably disposed on the rotating shaft (43) along the axial direction of the rotating shaft (43), and a spring (442) is disposed between the two grinding discs (441).

8. The electric knife sharpener with a rotatable, pull-out type for changing sharpening parts according to claim 1, characterized in that, The grinding disc (441) consists of a grinding disc fixing seat (4411), a grinding disc pressure ring (4413), and a grinding disc (4412). The grinding disc (4412) is pressed and fixed on the grinding disc fixing seat (4411) by the grinding disc pressure ring (4413).

9. The electric knife sharpener with a rotatable, pull-out type for changing the sharpening tool as described in claim 1, characterized in that, It also includes a guide assembly (3), which includes a guide cover (31) fixedly connected to the inner cavity of the housing (1) and covering the grinding assembly (4). The top of the guide cover (31) has a plurality of grinding grooves (32) that correspond one-to-one with the grinding mouth (45) for exposure. The top two ends of the guide cover (31) and the two adjacent grinding disc groups (44) are provided with guide blocks (33). The two sides of the guide block (33) form inclined surfaces to support the cutting tool. The top of the guide cover (31) and the two adjacent guide blocks (33) are provided with support blocks. The two sides of the support blocks are respectively provided with spring pieces (34) to press the cutting tool against the surface of the guide block (33). The support block and the opposite guide block (33) form a grinding guide groove.

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