Bean grinder convenient for grinding adjustment

By introducing a snap-fit ​​connection and scale indicator structure into the coffee grinder, the problem of the inconvenience of having to remove the coffee cup to adjust the grind in existing coffee grinders is solved, achieving the effect of conveniently adjusting the coarseness of coffee beans and preventing powder from spilling out.

CN224219983UActive Publication Date: 2026-05-12GUANGDONG SHUNDE FUKEWANG DESIGN CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
GUANGDONG SHUNDE FUKEWANG DESIGN CO LTD
Filing Date
2025-04-29
Publication Date
2026-05-12

AI Technical Summary

Technical Problem

Current coffee grinders require removing the coffee cup and adjusting the grind size at the bottom of the grinder, which is inconvenient.

Method used

A coffee grinder structure including a cup lid, coffee cup, bean hopper, and lid body was designed. Through the cooperation of snap-fit ​​connection and scale pointer, the coarseness of the ground coffee beans can be easily adjusted. The scale on the outer wall of the lid body and the pointer on the outer wall of the bean hopper indicate the grind. The rotation of the lid body drives the upper grinding disc to rotate, adjusting the gap width between the upper and lower grinding discs, thus achieving convenient adjustment.

Benefits of technology

It simplifies the process of adjusting the coarseness of coffee beans, improves ease of operation, prevents coffee powder from spilling, and has a reasonable structural design, making it suitable for home use and travel.

✦ Generated by Eureka AI based on patent content.

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  • Figure CN224219983U_ABST
    Figure CN224219983U_ABST
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Abstract

The bean grinder comprises a cup cover, a coffee cup, a bean bin and a cover body, the cup cover is arranged at the bottom of the coffee cup, the bean bin is arranged at the top of the coffee cup, the cover body is arranged at the top of the bean bin, a protruding bean bin seat is arranged on the bottom face of the bean bin, the bean bin seat is arranged in the coffee cup in a penetrating mode, and a driving plate is arranged on the top face of the bean bin seat. A driving plate seat is arranged in the driving plate; a key cover is arranged on the top face of the cover body, a protruding cutter adjusting screw rod is arranged on the bottom face of the cover body, the cutter adjusting screw rod is arranged in the drive plate seat in a penetrating mode, a rotating rod is arranged in the cutter adjusting nut sleeve, a motor is arranged at one end, arranged in the cutter adjusting screw rod in a penetrating mode, of the rotating rod, and the other end of the rotating rod is arranged in the bean bin support in a penetrating mode. The bean bin support seat is arranged at the top of the bean bin supporting plate, the upper millstone is arranged at the bottom of the bean bin support seat and arranged at the top of the millstone seat, and the lower millstone is arranged at the bottom of the millstone seat; the coffee bean grinder has the beneficial effects that the coffee bean grinder is simple and reasonable in structural design and is provided with a structure convenient for adjusting the thickness of ground coffee beans.
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Description

Technical Field

[0001] This utility model belongs to the technical field of coffee grinders, and specifically relates to a coffee grinder that is easy to adjust the grinding process. Background Technology

[0002] Currently, cocoa, coffee, and tea are considered the world's three major beverages. Cocoa is stimulating and invigorating, coffee is romantic and rich, and tea has a natural and refreshing aroma. As one of the world's three major beverages, coffee has a long history and is widely known. Coffee is being accepted by more and more consumers, and it is gradually becoming associated with fashion, modern life, work, and leisure. People love drinking coffee more and more, whether at home, in the office, or traveling for social occasions. To enjoy freshly ground coffee, a coffee grinder is indispensable.

[0003] However, existing coffee grinders require adjusting the grind size of the coffee beans, which necessitates removing the coffee cup and adjusting the grind size at the bottom of the grinder, resulting in significant inconvenience for freshly ground coffee. Utility Model Content

[0004] This invention proposes a coffee grinder that is easy to adjust and grind, solving the problems mentioned in the background art of the prior art.

[0005] The technical solution of this utility model is implemented as follows: it includes a coffee grinder, which includes a cup lid, a coffee cup, a bean hopper, and a lid body. The cup lid is located at the bottom of the coffee cup, the bean hopper is located at the top of the coffee cup, and the lid body is located at the top of the bean hopper.

[0006] The lid and the coffee cup are connected by a snap-fit ​​mechanism.

[0007] The top surface of the cup lid has a protruding ring, and a keyway is provided on one side of the ring.

[0008] The coffee cup has a protruding key block on one side inside, which passes through the key groove and forms a snap-fit ​​connection structure.

[0009] The coffee cup has a key block structure that is vertically mounted.

[0010] The coffee cup and the bean hopper are connected by a snap-fit ​​mechanism.

[0011] The bottom of the bean hopper has a protruding bean hopper seat, and the top has a dial.

[0012] The bean hopper seat has a keyway on one side, and the bean hopper seat passes through the inside of the coffee cup. The keyway connects with the key block on the coffee cup, which helps to form a snap-fit ​​connection between the bean hopper and the coffee cup.

[0013] The keyway provided on the bean bin base is U-shaped, and the keyway provided on the bean bin base has upper and lower card slots.

[0014] The dial has a dial base inside. One side of the wall surface of the dial base has a protruding elastic bead, and the other side has a keyway.

[0015] One side of the bean bin has a bean bin opening. The bean bin has a bean bin door inside. The bean bin door is a movable structure, and one side of the bean bin door has a bean bin opening, which helps to form a structure convenient for adding coffee beans.

[0016] The cover body and the bean bin are in a snap-fastening connection structure.

[0017] The top surface of the cover body has a button cover, and the bottom surface has a protruding adjusting knife screw.

[0018] The adjusting knife screw penetrates inside the dial base. One end of the adjusting knife screw is in a threaded assembly structure with an adjusting knife nut sleeve, and the adjusting knife nut sleeve is embedded inside the adjusting knife screw.

[0019] The adjusting knife nut sleeve has a rotating rod inside. One end of the rotating rod penetrating inside the adjusting knife screw has a motor, and the other end penetrates inside the bean bin bracket. The bean bin bracket has a bean bin bracket base penetrating inside.

[0020] The bean bin bracket base is provided on the top of the bean bin tray. There is a spring between the bean bin bracket and the bean bin tray.

[0021] The bottom of the bean bin bracket base has an upper grinding disc. The upper grinding disc is provided on the top of the grinding disc base, and the bottom of the grinding disc base has a lower grinding disc.

[0022] As a preferred embodiment, the top of the lower grinding disc has a spring, and the bottom has a grinding disc lock.

[0023] The bottom surface of the bean bin base has a grinding disc lock. Around the grinding disc lock, there is a raised ring structure concentric with the grinding disc lock. The raised ring structure is a splash-proof border.

[0024] The bean bin base is overall cylindrical. There are several groups of keyways on its circumferential surface. The several groups of keyways are circumferentially evenly distributed on the outer circumferential surface of the bean bin base, and the number of keyway groups is 2 to 5.

[0025] Each group of the keyways is vertically placed in a U-shaped shape, which includes a horizontal first positioning groove, a horizontal second positioning groove, and a vertically extending connecting groove connecting the first positioning groove and the second positioning groove.

[0026] In a preferred embodiment, the bottom of the button cover is provided with a silicone plug, the bottom of the silicone plug is located on the top of the inner cover, the bottom of the inner cover is provided with a circuit board, the bottom of the circuit board is located on a circuit board base, the bottom of the circuit board base is provided with a battery, the battery is located on the top of the battery base, the bottom of the battery base is provided with a motor, the motor passes through the motor base, a sealing ring is provided on one side of the motor base, a spring is provided on the bottom surface of the sealing ring, and one end of the spring is located on the top of the adjusting screw.

[0027] In a preferred embodiment, a lever is provided on the side of the top of the adjusting screw opposite to the battery holder, with the battery holder side passing through the top of the adjusting screw.

[0028] As a preferred embodiment, a scale is provided on one side of the outer wall of the cover.

[0029] As a preferred embodiment, a pointer is provided on one side of the outer wall of the bean hopper.

[0030] After adopting the above technical solution, the beneficial effects of this utility model are as follows: its structural design is simple and reasonable, and it has a structure that facilitates the adjustment of the coarseness of the ground coffee beans; its coffee grinder includes a cup lid, a coffee cup, a bean hopper, and a lid body. The cup lid is located at the bottom of the coffee cup, the bean hopper is located at the top of the coffee cup, and the lid body is located at the top of the bean hopper. One end of the lid body has a protruding adjusting screw, and a rotating rod passes through the adjusting screw. The motor transmits power to the rotating rod, and the rotating rod drives the lower grinding disc to rotate. The lower grinding disc passes through the upper grinding disc. When the coffee beans pass through the middle of the upper and lower grinding discs, the coffee beans will be ground into coffee powder; a scale is provided on one side of the outer wall of the lid body, and a pointer is provided on one side of the outer wall of the bean hopper. The lid body can be adjusted by rotation. When the lid body rotates, it drives the upper grinding disc to rotate. The gap between the upper and lower grinding discs forms an adjustable structure, which facilitates the adjustment of the coarseness of the ground coffee beans. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the overall structure of the coffee grinder of this utility model.

[0033] Figure 2 This is a schematic diagram of the overall structure of the bean hopper door of this utility model.

[0034] Figure 3 This is an exploded view of the overall structure of the coffee grinder of this utility model.

[0035] Figure 4 This is a schematic diagram of the overall structure of the dial of this utility model.

[0036] Figure 5 This is an exploded view of the overall structure of the cover of this utility model.

[0037] Figure 6 This is a cross-sectional view of the overall structure of the lid and bean hopper assembled in this utility model.

[0038] Figure 7 This is a schematic diagram of the overall structure of the bean bin of this utility model.

[0039] Figure 8 This is a schematic diagram of the overall structure of the coffee grinder of this utility model.

[0040] Figure 9 This is a schematic diagram of the bean hopper base structure of the bean grinder of this utility model. Detailed Implementation

[0041] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0042] like Figures 1-9 As shown:

[0043] Example 1:

[0044] The coffee grinder includes a lid 405, a coffee cup 404, a bean hopper 402, and a lid body 401. The lid 405 is located at the bottom of the coffee cup 404, the bean hopper 402 is located at the top of the coffee cup 404, and the lid body 401 is located at the top of the bean hopper 402. One end of the lid body 401 has a protruding blade adjusting screw 424, and a rotating rod 429 passes through the blade adjusting screw 424. A motor 417 transmits power to the rotating rod 429, and the rotating rod 429 drives the lower grinding disc 445 to rotate. The lower grinding disc 445 is inserted inside the upper grinding disc 440. When coffee beans pass through the middle of the upper grinding disc 440 and the lower grinding disc 445, the coffee beans will be ground into coffee powder. A scale is provided on one side of the outer wall of the lid 401, and a pointer is provided on one side of the outer wall of the bean hopper 402. The lid 401 can be adjusted by rotation. When the lid 401 rotates, it drives the upper grinding disc 440 to rotate. The gap between the upper grinding disc 440 and the lower grinding disc 445 forms an adjustable structure, which makes it easy to adjust the coarseness of the ground coffee beans.

[0045] The top surface of the cover 401 is provided with a button cover 406, and the bottom surface is provided with a protruding knife adjusting screw 424. The knife adjusting screw 424 passes through the inside of the dial seat 427. One end of the knife adjusting screw 424 is threadedly assembled with the knife adjusting nut sleeve 428, which is embedded inside the knife adjusting screw 424. A rotating rod 429 is provided inside the knife adjusting nut sleeve 428. One end of the rotating rod 429 passes through the motor 417 provided inside the knife adjusting screw 424, and the other end passes through the inside of the bean hopper support 433. A bean hopper support base 436 passes through the inside of the bean hopper support 433. The bean hopper support base 436 is provided on the bean hopper tray. At the top of 438, the bottom of the bean hopper support base 436 is provided with an upper grinding disc 440, which is located on the top of the grinding disc base 441. At the bottom of the grinding disc base 441, a lower grinding disc 445 is provided. Inside the dial 425, there is a dial base 427. On one side of the wall of the dial base 427, there is a protruding elastic bead 426. The elastic bead 426 is locked in the elastic bead groove ring of the adjusting screw 424 by elastic force. At this time, the cover body 401 rotates 324 degrees clockwise or 324 degrees counterclockwise. There is a stop every 7.2 degrees in the middle, and there are 45 stops in total, which realizes the structure that makes it easy to adjust the coarseness of grinding coffee beans.

[0046] When the number 9 on the scale of the lid 401 is aligned with the dot pointer on the bean hopper 402, the scale is adjusted to the coarsest grinding setting. When the lid 401 is rotated 324 degrees clockwise, the number 0 on the scale of the lid 401 is aligned with the dot pointer on the bean hopper 402, and the scale is adjusted to the finest grinding setting.

[0047] The lid 405 and the coffee cup 404 are connected by a snap-fit ​​mechanism. The top surface of the lid 405 has a protruding ring with a keyway on one side. The inside of the coffee cup 404 has a protruding key block that fits into the keyway, forming the snap-fit ​​connection. After the coffee bean grinding process is complete and the coffee cup 404 is filled with ground coffee, the lid 405, which was originally snapped into the bottom of the coffee cup 404, can be removed after removing the coffee cup 404 from the machine. It can then be directly placed on the coffee cup 404 and tightened to secure it, making it easy to carry and preventing coffee powder from spilling.

[0048] The coffee cup 404 is shaped like a complete cup. The lid 405 is designed to fit onto the coffee cup 404. When the coffee cup 404 needs to be attached to a machine to catch ground coffee powder, the lid 405 is snapped onto the bottom of the coffee cup 404 for easy storage and to prevent it from being lost.

[0049] The coffee cup 404 has a key block structure with upper and lower parts. The lower key block of the coffee cup 404 is connected to the cup lid 405 by a snap-fit ​​mechanism; the upper key block of the coffee cup 404 is connected to the bean hopper 402 by a snap-fit ​​mechanism.

[0050] The bottom surface of the bean hopper 402 has a protruding bean hopper seat 450. The bean hopper seat 450 is inserted into the coffee cup 404. The bean hopper seat 450 is cylindrical in shape and has several sets of keyways on its circumference, which are evenly distributed on the outer circumference of the bean hopper seat 450. These keyways connect with key blocks on the coffee cup 404, forming a snap-fit ​​connection between the bean hopper 402 and the coffee cup 404. Each set of keyways on the bean hopper seat 450 is a vertically placed "U"-shaped structure, including a horizontal first positioning groove 451, a horizontal second positioning groove 452, and a vertically oriented connecting groove 453 connecting the first positioning groove 451 and the second positioning groove 452. The first positioning groove 451 is located above the second positioning groove 452. When the bean hopper seat 450 is fully inserted into the coffee cup 404, the coffee cup... When the key block provided in coffee cup 404 is engaged and locked with the first positioning groove provided in coffee bean hopper 450, the coffee powder capacity of coffee cup 404 is at its minimum. However, if the first positioning groove 451 of coffee bean hopper 450 is slid out of the key block of coffee cup 404, and the key block slides along the connecting groove 453, it actually pulls coffee bean hopper 450 out in a direction relative to the coffee cup until the key block provided in coffee cup 404 is engaged and locked with the second positioning groove provided in coffee bean hopper 450, at which point the coffee powder capacity of coffee cup 404 is at its maximum.

[0051] Whether the keyway of the bean hopper 450 engages with the key block of the coffee cup 404 via the first positioning slot 451 or the second positioning slot 452, the machine body can maintain a stable and tight assembly, and can be turned on and grinded normally in both different states.

[0052] The cover 401 is mounted on the dial 425 on the top surface of the bean hopper 402 via the adjusting screw 424. The dial 425 is fastened to the key block of the adjusting screw 424 by a keyway. Thus, the cover 401 and the bean hopper 402 form a snap-fit ​​connection structure.

[0053] A silicone plug 407 is provided at the bottom of the button cover 406. The bottom of the silicone plug 407 is located at the top of the inner cover 409. A circuit board 411 is provided at the bottom of the inner cover 409. The bottom of the circuit board 411 is located at the bottom of the circuit board base 413. A battery 414 is provided at the bottom of the circuit board base 413. The battery 414 is located at the top of the battery base 416. A motor 417 is provided at the bottom of the battery base 416. The motor 417 passes through the motor base 419. A sealing ring 420 is provided on one side of the motor base 419. A spring 421 is provided on the bottom surface of the sealing ring 420. One end of the spring 421 is located at the top of the adjusting screw 424. After the power switch is turned on, the rotation of the motor 417 transmits the transmission to the rotating rod 429. Driven by the rotation of the rotating rod 429, the lower grinding disc 445 rotates. When the coffee beans pass between the upper grinding disc 440 and the lower grinding disc 445, the coffee beans are ground into coffee powder.

[0054] The bean hopper 402 has a bean hopper opening on one side and a bean hopper door 403 inside the bean hopper 402. The bean hopper door 403 is a movable structure, and the bean hopper opening 402 is located on one side of the bean hopper door 403, which helps to form a structure that makes it easy to add coffee beans. Coffee beans are put in through the open bean hopper door 403, and then the bean hopper door 403 is closed. The grinding button switch on the top of the cover 401 can be turned on to start grinding.

[0055] Second embodiment:

[0056] The adjusting screw 424 is connected by a key block on one side and a keyway on the other side of the dial seat 427 wall, which helps the cover 401 and the bean hopper 402 to be connected by a snap-fit ​​structure.

[0057] Example 3:

[0058] A spring 437 is provided between the bean hopper support 433 and the bean hopper tray 438. The bean hopper support 433 is locked to the bean hopper seat 450 by screws 434 and is a non-rotating component. The bean hopper seat 450 is clamped to the bean hopper 402 and is a non-rotating component. The bean hopper tray 438 is locked to the bean hopper support 433 by screws 439 and is a non-rotating component. The bean hopper tray 438 supports the spring 437 and generates an upward elastic force. The lower grinding disc 445 is locked and clamped to the rotating rod 429 by the grinding disc lock 446, screw washer 447, and screw 448 and is a component that can only be driven to rotate by the motor 417 and cannot move up and down. The lower grinding disc 445 supports the spring 444 and generates an upward elastic force.

[0059] When the adjusting nut 428 moves upward, springs 437 and 444 generate an upward elastic force, pushing the bean hopper support 436, upper grinding disc 440, grinding disc 441, screw washer 442, and screw 443 assembly upward to reset.

[0060] Example 4:

[0061] The lower grinding disc 445 has a spring 444 at the top and a grinding disc lock 446 at the bottom. The bean hopper support 433 is locked to the bean hopper seat 450 by screws 434 and is a non-rotating component. The bean hopper seat 450 is clamped to the bean hopper 402 and is a non-rotating component. The bean hopper tray 438 is locked to the bean hopper support 433 by screws 439 and is a non-rotating component. The bean hopper tray 438 supports the spring 437 and generates an upward elastic force. The lower grinding disc 445 is locked and clamped to the rotating rod 429 by the grinding disc lock 446, screw washer 447, and screw 448 and is a component that can only be driven to rotate by the motor 417 and cannot move up and down. The lower grinding disc 445 supports the spring 444 and generates an upward elastic force.

[0062] When the adjusting nut 428 moves upward, springs 437 and 444 generate an upward elastic force, pushing the bean hopper support 436, upper grinding disc 440, grinding disc 441, screw washer 442, and screw 443 assembly upward to reset.

[0063] Example 5:

[0064] The assembly of cover 401 includes the following accessories: button cover 406, silicone plug 407, screw 408, top inner cover 409, lamp post 410, circuit board 411, screw 412, circuit board holder 413, battery 414, screw 415, battery holder 416, motor 417, sealing ring 418, motor holder 419, sealing ring 420, cover 401, spring 421, lever 422, screw 423, and adjusting screw 424.

[0065] The assembly of bean hopper 402 includes the following accessories: dial 425, spring ball 426, dial base 427, bean hopper 402, bean hopper door 403, bean hopper base 450, knife adjusting nut sleeve 428, rotating rod 429, bearing 430, bearing 431, retaining ring 432, bean hopper bracket 433, screw 434, screw 435, bean hopper bracket base 436, spring 437, bean hopper tray 438, screw 439, upper grinding disc 440, grinding disc base 441, screw washer 442, screw 443, spring 444, lower grinding disc 445, grinding disc lock 446, screw washer 447, and screw 448.

[0066] Example 6:

[0067] A lever 422 is provided on the top side of the adjusting screw 424 opposite to the battery holder 416. The battery holder 416 is inserted through the top of the adjusting screw 424. When the internal structure of the grinding fineness adjustment mechanism of the cover body 401 assembly is working, only the cover body 401, spring 421, lever 422, screw 423, and adjusting screw 424 rotate within the range of 0~324 degrees. Power is transmitted through the adjusting screw 424 to drive the adjusting nut sleeve 428 to rotate clockwise or counterclockwise. The mechanism can move upwards or downwards simultaneously. The adjusting nut sleeve 428 rotates clockwise or counterclockwise, which in turn moves upwards or downwards, driving the bean hopper support base 436, upper grinding disc 440, grinding disc base 441, screw washer 442, and screw 443 components within the bean hopper 402 assembly to move upwards or downwards at the same time. When it moves upwards to the stop position, the grinding coarseness adjustment mechanism is adjusted to the coarsest grinding state. When it moves downwards to the stop position, the grinding coarseness adjustment mechanism is adjusted to the finest grinding state.

[0068] Example 7:

[0069] Please refer to the attached document. Figure 9The diagram shows the structure of the bean hopper holder 450. On the bottom surface of the bean hopper holder 450, around the grinding disc lock 446, there is a raised annular structure concentric with the grinding disc lock 446. This is a splash guard 454 to prevent the ground coffee powder from splashing out. The purpose is to block the ground coffee powder, which, after being ground by the grinding disc, still carries the centrifugal rotation speed from the grinding process and has a certain potential energy to splash outwards. This guard can block most of the splashing, preventing it from splashing onto the surrounding wall and allowing it to fall more effectively into the coffee cup 404.

[0070] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A coffee grinder facilitating adjustment of grinding, comprising a cup lid, a coffee cup, a bean bin and a body. The cup lid is provided at the bottom of the coffee cup, the bean bin is provided at the top of the coffee cup, and the body is provided at the top of the bean bin. It is characterized in that: The cup lid and the coffee cup are in a structure of snap connection; The coffee cup and the bean bin are in a structure of snap connection; A protruding bean bin seat is provided on the bottom surface of the bean bin, and the bean bin seat penetrates inside the coffee cup; A dial is provided on the top surface of the bean bin seat, a dial seat is provided inside the dial, and a protruding elastic bead is provided on one side of the wall surface of the dial seat; A bean bin opening is provided on one side of the bean bin, and a bean bin door is provided inside the bean bin; The body and the bean bin are in a structure of snap connection; A key cap is provided on the top surface of the body, and a protruding adjusting knife screw rod is provided on the bottom surface; The adjusting knife screw rod penetrates inside the dial seat, and one end of the adjusting knife screw rod is in a structure of threaded assembly with an adjusting knife nut sleeve; A rotating rod is provided inside the adjusting knife nut sleeve, one end of the rotating rod penetrating inside the adjusting knife screw rod is provided with a motor, and the other end penetrates inside the bean bin support; A bean bin support seat penetrates inside the bean bin support, the bean bin support seat is provided on the top of a bean bin tray, an upper grinding disc is provided at the bottom of the bean bin support seat, the upper grinding disc is provided on the top of a grinding disc seat, and a lower grinding disc is provided at the bottom of the grinding disc seat.

2. A coffee grinder for easy grinding as described in claim 1, characterized in that: A spring is provided on the top of the lower grinding disc, and a grinding disc lock is provided at the bottom; 3. A coffee grinder for easy adjustment of grinding as described in claim 2, characterized in that: A grinding disc lock is provided on the bottom surface of the bean bin seat, and around the grinding disc lock, a protruding ring structure concentric with the grinding disc lock is provided, and the protruding ring structure is a splash-proof border; 4. A coffee grinder for easy adjustment of grinding as described in claim 3, characterized in that: The whole bean bin seat is cylindrical, and a plurality of groups of key grooves are provided on its circumferential surface. The plurality of groups of key grooves are circumferentially distributed on the outer circumferential surface of the bean bin seat, and the number of key grooves is 2 - 5 groups; 5. A coffee grinder for easy adjustment of grinding as described in claim 4, characterized in that: Each group of the key grooves is in a shape of "凵" vertically placed, and it includes a horizontal first positioning groove, a horizontal second positioning groove and a vertical connecting groove connecting the first positioning groove and the second positioning groove; 6. A coffee grinder for easy adjustment of grinding as described in claim 2, characterized in that: A silica gel plug is provided at the bottom of the key cap, the bottom of the silica gel plug is provided on the top of an inner top cover, a circuit board is provided at the bottom of the inner top cover, the circuit board is provided at the bottom of a circuit board seat, a battery is provided at the bottom of the circuit board seat, the battery is provided on the top of a battery seat, a motor is provided at the bottom of the battery seat, the motor penetrates inside a motor seat, a sealing ring is provided on one side of the motor seat, and a spring is provided on the bottom surface of the sealing ring, and one end of the spring is provided on the top of the adjusting knife screw rod; 7. A coffee grinder for easy adjustment of grinding as described in claim 3, characterized in that: A lever is provided on one side of the top of the adjusting knife screw rod opposite to the battery seat, and one side of the battery seat penetrates on the top of the adjusting knife screw rod; 8. A coffee grinder for easy adjustment of grinding as described in claim 4, characterized in that: A scale is provided on one side of the outer wall of the body; 9. A coffee grinder for easy adjustment of grinding as described in claim 5, characterized in that: A pointer is provided on one side of the outer wall of the bean bin