Portable coffee bean grinding machine

Abstract

The utility model relates to the technical field of grinding equipment, in particular to a portable coffee bean grinding machine which comprises a machine body, a motor, a transmission shaft, an inner grinding head, an outer grinding head and an adjusting inner knob are arranged in the machine body, the transmission shaft is fixedly connected with the inner grinding head and is driven by the motor to rotate, and the outer grinding head is fixed in the machine body. The inner grinding head and the outer grinding head are correspondingly arranged, a grinding gap is formed between the inner grinding head and the outer grinding head, and the adjusting inner knob is correspondingly connected with the transmission shaft; the machine body is provided with an outer adjusting knob, the outer adjusting knob is in threaded connection with the inner adjusting knob, and the inner adjusting knob is driven by rotating the outer adjusting knob to drive the transmission shaft and the inner grinding head to ascend and descend so as to adjust the size of the grinding gap. During adjustment, the outer adjusting knob is rotated to make threaded motion with the inner adjusting knob, and then the inner adjusting knob is driven to drive the transmission shaft and the inner grinding head to ascend and descend relative to the outer grinding head so as to adjust the size of the grinding gap, operation is convenient, and coffee quality cannot be affected.

Description

TECHNICAL FIELD

[0001] The utility model relates to a portable coffee bean grinder. BACKGROUND

[0002] With the improvement of people's quality of life, it has become a fashion to taste coffee in leisure time, especially when camping in the wild. Freshly grinding and brewing coffee beans can preserve the original aroma of coffee to a greater extent, and the fineness of the ground coffee powder will also affect the taste and experience.

[0003] The existing coffee bean grinder is manual or electric. The utility model discloses a kind of grinder of adjustable particle precision, which is disclosed in the utility model patent with announcement number CN221690721U, by being equipped with adjusting knob below transmission shaft in grinder, to adjust the size of grinding gap according to requirement;This way needs to open lower end cover to operate, and operation is more cumbersome, not enough convenient to use, and when opening lower end cover to adjust, dust and other sundries will enter, at the same time, adjusting knob is located below transmission shaft, and it needs to contact with adjusting knob when adjusting, and adjusting knob will contact with ground coffee powder, and then contact pollution of coffee powder is caused, which affects coffee quality.

[0004] Therefore, there is still room for improvement in the prior art. UTILITY MODEL CONTENTS

[0005] In order to solve the problems of the prior art, the utility model provides a portable coffee bean grinder, which is easy to operate and does not affect the quality of coffee.

[0006] In order to achieve the above purpose, the technical scheme applied by the utility model is as follows:

[0007] A portable coffee bean grinder, comprising a body, the body is provided with a motor, a transmission shaft, an inner grinding head, an outer grinding head and an adjusting inner knob, the transmission shaft is fixedly connected with the inner grinding head, the transmission shaft is driven to rotate by the motor, the outer grinding head is fixed in the body, the inner grinding head and the outer grinding head are arranged correspondingly, and a grinding gap is formed between the inner grinding head and the outer grinding head, the adjusting inner knob is connected with the transmission shaft correspondingly; the body is provided with an adjusting outer knob, the adjusting outer knob is threadedly connected with the adjusting inner knob, the adjusting outer knob is rotated to drive the adjusting inner knob to drive the transmission shaft and the inner grinding head to ascend and descend relative to the outer grinding head, so as to adjust the size of the grinding gap.

[0008] According to the scheme, the fuselage comprises an upper shell, a middle shell and a lower shell, the upper end of the middle shell is detachably connected with the upper shell, the lower end of the middle shell is detachably connected with the lower shell, the motor is fixed in the upper shell, and the lower shell is formed with a powder storage cavity; the adjusting inner knob is located in the middle shell and can be lifted and lowered, the adjusting inner knob is provided with a sleeve one, the middle shell is provided with a sleeve two, the upper end of the transmission shaft is connected with the output end of the motor in correspondence, the lower end of the transmission shaft passes through the sleeve one and the sleeve two in sequence and is fixedly connected with the inner grinding head, and the outer grinding head is fixed in the middle shell; the transmission shaft, the sleeve one and the sleeve two are coaxially arranged, the transmission shaft can slide up and down relative to the sleeve one and the sleeve two, the upper end of the transmission shaft is fixed with a limiting clamp, the limiting clamp is limitedly matched with the upper end surface of the sleeve one, the lower end of the transmission shaft is provided with a reset spring, and the two ends of the reset spring are respectively abutted against the lower end surface of the sleeve two and the upper end surface of the inner grinding head.

[0009] According to the scheme, a plurality of positioning beads are fixed on the side wall of the middle shell, the first ends of the plurality of positioning beads are protruded on the inner wall of the middle shell, the second ends of the plurality of positioning beads are arranged on the outer wall of the middle shell, and the second ends of the plurality of positioning beads are provided with retractable ball beads; the adjusting inner knob is formed with an outer thread and a plurality of guide sliding grooves, the guide sliding grooves are arranged in correspondence with the first ends of the positioning beads, the inner wall of the adjusting outer knob is formed with a positioning groove and an inner thread, the positioning groove is arranged in correspondence with the ball beads of the positioning beads, and the inner thread is threadedly connected with the outer thread.

[0010] According to the scheme, the sleeve one is provided with a bearing one connected with the transmission shaft in correspondence, and the sleeve two is provided with a bearing two connected with the transmission shaft in correspondence.

[0011] According to the scheme, the inner grinding head is in a circular table structure, the outer wall of the inner grinding head is formed with a grinding inclined surface, the inner wall of the outer grinding head is formed with an upper grinding inclined surface and a lower grinding inclined surface, an included angle is formed between the upper grinding inclined surface and the grinding inclined surface, the lower grinding inclined surface is arranged in correspondence with the grinding inclined surface, and a grinding gap is located between the lower grinding inclined surface and the grinding inclined surface.

[0012] According to the scheme, a lower fixing seat is fixed in the middle shell, the outer grinding head is fixed on the lower fixing seat through an upper fixing seat, a lower limiting step and a flat position two are formed on the inner wall of the lower fixing seat, a flat position one is arranged on the outer wall of the outer grinding head in correspondence with the flat position two, an upper limiting step is formed between the upper fixing seat and the lower fixing seat, when the outer grinding head is assembled on the lower fixing seat, the upper end surface of the outer grinding head is abutted against the upper limiting step, and the lower end surface of the outer grinding head is abutted against the lower limiting step.

[0013] According to the scheme, the upper end of the lower fixing seat is formed with a mounting groove for fixing the upper fixing seat, and the upper fixing seat is threadedly connected with the lower fixing seat; the outer wall of the lower fixing seat is tightly attached to the inner wall of the middle shell, and the upper end surface of the upper fixing seat is formed with a material guiding inclined surface.

[0014] According to the scheme, the outer wall of the adjusting outer knob is formed with an anti-skid pattern.

[0015] According to the scheme, the middle shell is formed with a screwing groove, the upper shell is formed with a screwing buckle corresponding to the screwing groove, the middle shell is provided with a feeding port, and the feeding port is provided with a detachable cover.

[0016] According to the scheme, the output end of the motor is provided with a shaft coupling corresponding to the upper end of the transmission shaft, the upper shell is provided with a battery, and the upper shell is provided with a charging port and a heat dissipation hole.

[0017] The utility model has the advantages of:

[0018] The utility model discloses the adjustment of the inside knob is driven to drive the transmission shaft and the inside grinding head to go up and down to adjust the grinding gap size, and the operation is convenient, and the coffee quality is not affected. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the whole structure schematic view of the utility model;

[0020] Figure 2 It is the whole structure sectional view of the utility model;

[0021] Figure 3 It is Figure 2 The middle A position enlarged view;

[0022] Figure 4 It is the assembly schematic view of the outside grinding head, the upper fixed seat and the lower fixed seat of the utility model;

[0023] Figure 5 It is the assembly schematic view of the middle shell, the inside knob and the transmission shaft of the utility model;

[0024] Figure 6 It is the assembly schematic view of the middle shell, the inside knob and the outside knob of the utility model;

[0025] Figure 7 It is the assembly schematic view of the inside knob, the outside knob and the locating bead of the utility model;

[0026] Figure 8 It is the assembly schematic view of the upper shell and the middle shell of the utility model.

[0027] In the drawing:

[0028] 1. Upper shell; 11. Charging port; 12. Motor; 13. Coupling; 14. Battery; 15. Threaded fastener; 2. Middle shell; 21. Sleeve II; 22. Bearing II; 23. Upper fixed seat; 231. Upper limit step; 232. Guide slope; 24. Lower fixed seat; 241. Lower limit step; 242. Flat part II; 243. Mounting groove; 25. Threaded groove; 26. Cover; 27. Positioning bead; 3. Lower shell; 31 1. Powder storage chamber; 4. Adjustment knob; 41. Anti-slip texture; 42. Positioning groove; 43. Internal thread; 5. Adjustment knob; 51. Sleeve 1; 52. Bearing 1; 53. Limiting clamp; 54. External thread; 55. Guide groove; 6. Drive shaft; 7. Inner grinding head; 71. Grinding bevel; 8. Outer grinding head; 81. Flat part 1; 82. Upper grinding bevel; 83. Lower grinding bevel; 9. Return spring; 10. Grinding gap. Detailed Implementation

[0029] The technical solution of this utility model will be described below with reference to the accompanying drawings and embodiments.

[0030] like Figures 1 to 8 As shown, the portable coffee bean grinder of this utility model includes a body, inside which are a motor 12, a drive shaft 6, an inner grinding head 7, an outer grinding head 8, and an adjusting inner knob 5. The drive shaft 6 is fixedly connected to the inner grinding head 7 and is driven to rotate by the motor 12. The outer grinding head 8 is fixed inside the body, and the inner grinding head 7 and the outer grinding head 8 are correspondingly arranged, with a grinding gap 10 formed between them. The adjusting inner knob 5 is correspondingly connected to the drive shaft 6. The body is provided with an adjusting outer knob 4, which is threadedly connected to the adjusting inner knob 5. By rotating the adjusting outer knob 4, the adjusting inner knob 5 is driven to move the drive shaft 6 and the inner grinding head 7 relative to the outer grinding head 8, thereby adjusting the size of the grinding gap 10. With this setup, when adjusting, the external adjustment knob 4 located on the machine body is rotated, causing it to move in a threaded motion with the internal adjustment knob 5. This, in turn, drives the internal adjustment knob 5 to raise and lower the transmission shaft 6 and the internal grinding head 7, thereby adjusting the size of the grinding gap 10. This design is convenient to operate and does not affect the quality of the coffee. Its overall structure is compact, making it easy to carry and store.

[0031] In the coffee bean grinder described in this utility model, the inner grinding head 7 is rotated by the transmission shaft 6 driven by the motor 12 during grinding. During the rotation of the inner grinding head 7, it cooperates with the outer grinding head 8 to grind the coffee beans into powder. The inner grinding head 7 is a moving grinding head, and the outer grinding head 8 is a stationary grinding head.

[0032] Further, the machine body comprises an upper shell 1, a middle shell 2 and a lower shell 3, the upper end of the middle shell 2 is detachably connected with the upper shell 1, the lower end of the middle shell 2 is detachably connected with the lower shell 3, the motor 12 is fixed in the upper shell 1, and a powder storage cavity 31 is formed in the lower shell 3; the adjusting inner knob 5 is located in the middle shell 2 and can be lifted, the adjusting inner knob 5 is provided with a sleeve 1 51, the middle shell 2 is provided with a sleeve 2 21, the upper end of the transmission shaft 6 is connected with the output end of the motor 12 in correspondence, the lower end of the transmission shaft 6 passes through the sleeve 1 51 and the sleeve 2 21 in sequence and is fixedly connected with the inner grinding head 7, and the outer grinding head 8 is fixed in the middle shell 2; the transmission shaft 6, the sleeve 1 51 and the sleeve 2 21 are coaxially arranged, the transmission shaft 6 can slide up and down relative to the sleeve 1 51 and the sleeve 2 21, the upper end of the transmission shaft 6 is fixedly connected with a limiting clamp 53, the limiting clamp 53 is limitedly matched with the upper end surface of the sleeve 1 51, the lower end of the transmission shaft 6 is sleeved with a reset spring 9, and the two ends of the reset spring 9 abut against the lower end surface of the sleeve 2 21 and the upper end surface of the inner grinding head 7 respectively. In this way, the transmission shaft 6 can slide up and down relative to the sleeve 1 51 and the sleeve 2 21 and can rotate relative to the sleeve 1 51 and the sleeve 2 21 under the driving of the motor 12 after initial assembly, that is, the transmission shaft 6 is movably connected with the sleeve 1 51 and the sleeve 2 21, and the limiting clamp 53 on the transmission shaft 6 is always abutted against the upper end surface of the sleeve 1 51 (the area of the limiting clamp 53 is larger than the inner hole of the sleeve 1 51) under the elastic force of the reset spring 9, when the adjusting outer knob 4 is rotated to drive the adjusting inner knob 5 to move upward, the sleeve 1 51 of the adjusting inner knob 5 can drive the limiting clamp 53 and the transmission shaft 6 to move upward synchronously, thereby reducing the grinding gap 10, when the adjusting outer knob 4 is reversely rotated to drive the adjusting inner knob 5 to move downward, the sleeve 1 51 of the adjusting inner knob 5 is reset downward, the transmission shaft 6 is reset downward under the rebounding force of the reset spring 9 and the gravity of the inner grinding head 7 and the transmission shaft 6, and the limiting clamp 53 on the transmission shaft 6 is always abutted against the upper end surface of the sleeve 1 51.

[0033] In actual application, the transmission shaft 6, the sleeve 1 51 and the sleeve 2 21 are coaxially arranged, the sleeve 1 51 is located at the central position of the adjusting inner knob 5, and the sleeve 2 21 is located at the central position of the middle shell 2, so that the transmission shaft 6 is more stable when rotating.

[0034] Further, the plurality of positioning beads 27 are fixed on the side wall of the middle shell 2, the first end of the plurality of positioning beads 27 is protruded on the inner wall of the middle shell 2, the second end of the plurality of positioning beads 27 is arranged on the outer wall of the middle shell 2, and the second end of the plurality of positioning beads 27 is provided with retractable ball beads; the adjusting inner knob 5 is formed with external threads 54 and a plurality of guide sliding grooves 55, the guide sliding grooves 55 are arranged in correspondence with the first end of the positioning beads 27, the inner wall of the adjusting outer knob 4 is formed with a positioning groove 42 and internal threads 43, the positioning groove 42 is arranged in correspondence with the ball beads of the positioning beads 27, and the internal threads 43 are threadedly connected with the external threads 54. In this way, when the adjusting inner knob 5 is assembled, the plurality of guide sliding grooves 55 are aligned with the first end of the plurality of positioning beads 27 protruded on the inner wall of the middle shell 2 to guide the assembly of the adjusting inner knob 5, and after assembly, the adjusting inner knob 5 is limited, so that when the adjusting outer knob 4 rotates, the adjusting inner knob 5 does not rotate synchronously, and under the limitation of the positioning beads 27, when the adjusting inner knob 5 ascends and descends, the guide sliding grooves 55 slide vertically relative to the positioning beads 27, thereby driving the transmission shaft 6 and the inner grinding head 7 to ascend and descend vertically, and the size of the grinding gap 10 is adjusted. The second end of the positioning beads 27 is provided with retractable ball beads (the positioning beads 27 are prior art), the ball beads are clamped in the positioning groove 42 on the inner wall of the adjusting outer knob 4, so that the adjusting outer knob 4 can be clamped with the ball beads after rotating by a certain position, the adjusting position is more accurate, and after adjustment, the adjusting outer knob 4 does not change the thread with the adjusting inner knob 5.

[0035] In practical application, the stroke of the adjusting transmission shaft 6 and the inner grinding head 7 is smaller than the height of the guide sliding groove 55, so that the guide sliding groove 55 is always clamped at the first end of the positioning bead 27 when the adjusting inner knob 5 ascends and descends, and slides relative to the positioning bead 27.

[0036] Further, the sleeve one 51 is internally provided with a bearing one 52 connected with the transmission shaft 6 in correspondence, and the sleeve two 21 is internally provided with a bearing two 22 connected with the transmission shaft 6 in correspondence. In this way, the motor 12 drives the transmission shaft 6 to rotate relative to the sleeve one 51 and the sleeve two 21 more smoothly, and the damping force is small.

[0037] Further, the inner grinding head 7 is in a circular table structure, the outer wall of the inner grinding head 7 is formed with a grinding slope 71, the inner wall of the outer grinding head 8 is formed with an upper grinding slope 82 and a lower grinding slope 83, an included angle is formed between the upper grinding slope 82 and the grinding slope 71, the lower grinding slope 83 is arranged in correspondence with the grinding slope 71, and the grinding gap 10 is located between the lower grinding slope 83 and the grinding slope 71. In this way, the grinding slope 71 on the outer wall of the inner grinding head 7 cooperates with the upper grinding slope 82 and the lower grinding slope 83 to realize the extrusion grinding of coffee beans.

[0038] Further, the lower fixing base 24 is fixed in the middle shell 2, the outer grinding head 8 is fixed on the lower fixing base 24 through the upper fixing base 23, the lower limiting step 241 and the flat position two 242 are formed on the inner wall of the lower fixing base 24, the flat position one 81 is arranged on the outer wall of the outer grinding head 8 corresponding to the flat position two 242, the upper limiting step 231 is formed between the upper fixing base 23 and the lower fixing base 24, when the outer grinding head 8 is assembled on the lower fixing base 24, the upper end surface of the outer grinding head 8 abuts against the upper limiting step 231, and the lower end surface of the outer grinding head 8 abuts against the lower limiting step 241. In this way, the outer grinding head 8 is better fixed after assembly, the upper and lower end surfaces are limited by the upper limiting step 231 and the lower limiting step 241, and the outer grinding head 8 does not rotate relative to the lower fixing base 24 under the action of the flat position one 81 and the flat position two 233 during assembly.

[0039] Further, the mounting groove 243 for fixing the upper fixing base 23 is formed on the upper end of the lower fixing base 24, and the upper fixing base 23 is threadedly connected with the lower fixing base 24; the outer wall of the lower fixing base 24 is tightly attached to the inner wall of the middle shell 2, and the material guiding inclined surface 232 is formed on the upper end surface of the upper fixing base 23. In this way, during assembly, the outer grinding head 8 is placed in the lower fixing base 24, and then the upper fixing base 23 is threadedly connected in the mounting groove 243 of the lower fixing base 24, thereby fixing the outer grinding head 8, wherein the outer wall of the lower fixing base 24 is tightly attached to the inner wall of the middle shell 2, and the material guiding inclined surface 232 is formed on the upper end surface of the upper fixing base 23, so that the coffee beans cannot enter between the outer wall of the lower fixing base 24 and the inner wall of the middle shell 2, but can only be guided into the grinding gap 10 between the outer grinding head 8 and the inner grinding head 7 through the material guiding inclined surface 232.

[0040] Further, the anti-slip pattern 41 is formed on the outer wall of the adjusting outer knob 4. In this way, the rotation is more convenient, and the anti-slip is more labor-saving.

[0041] Further, the screwing groove 25 is formed on the middle shell 2, the screwing buckle 15 is formed on the upper shell 1, the screwing buckle 15 is arranged corresponding to the screwing groove 25, the feeding port is arranged on the middle shell 2, and the detachable cover 26 is arranged on the feeding port. In this way, the assembly and disassembly are convenient, when the coffee beans are assembled, the upper shell 1 is disassembled, the cover 26 is disassembled, the coffee beans are fed into the inner grinding head 7 and the outer grinding head 8 through the feeding port, after assembly, the cover 26 is covered, the upper shell 1 is assembled, the upper shell 1 limits the cover 26, the cover 26 closes the feeding port, and the coffee powder does not overflow during grinding.

[0042] Further, the output end of the motor 12 is provided with a coupling 13, the coupling 13 is correspondingly connected with the upper end of the transmission shaft 6, the upper shell 1 is provided with a battery 14, the upper shell 1 is provided with a charging port 11 and a heat dissipation hole. In this way, the battery 14 is arranged to provide power support, so that the coffee bean grinder is convenient to carry and use, and does not need to be connected with an external power plug, and is more convenient to use, and the battery 14 can be charged through the charging port 11.

[0043] In practical application, the upper end of the transmission shaft 6 is a non-circular end (preferably a polygonal end), the lower end of the coupling 13 is a non-circular hole (preferably a polygonal hole), the transmission shaft 6 and the coupling 13 are coupled, when the transmission shaft 6 is assembled on the coupling 13, the transmission shaft 6 can slide up and down relative to the coupling 13 but cannot rotate relative to the coupling 13, so that when the motor 12 drives the coupling 13 to rotate, the coupling 13 can drive the transmission shaft 6 to rotate synchronously.

[0044] The embodiments of the utility model are described above in combination with the drawings, but the utility model is not limited to the above-mentioned specific embodiments, the above-mentioned specific embodiments are only illustrative and not restrictive, and the person skilled in the art can make many forms under the inspiration of the utility model without departing from the purpose of the utility model and the scope protected by the claims, and these all belong to the protection scope of the utility model.

Claims

1. A portable coffee bean grinder, comprising a machine body, characterized in that: a motor (12), a transmission shaft (6), an inner grinding head (7), an outer grinding head (8) and an adjusting inner knob (5) are arranged in the machine body, the transmission shaft (6) is fixedly connected with the inner grinding head (7), the transmission shaft (6) is driven to rotate by the motor (12), the outer grinding head (8) is fixed in the machine body, the inner grinding head (7) is arranged correspondingly with the outer grinding head (8), and a grinding gap (10) is formed between the inner grinding head (7) and the outer grinding head (8), and the adjusting inner knob (5) is correspondingly connected with the transmission shaft (6). An adjusting outer knob (4) is arranged on the machine body, the adjusting outer knob (4) is threadedly connected with the adjusting inner knob (5), the adjusting outer knob (4) is rotated to drive the adjusting inner knob (5) to drive the transmission shaft (6) and the inner grinding head (7) to ascend and descend relative to the outer grinding head (8) to adjust the size of the grinding gap (10). The machine body comprises an upper shell (1), a middle shell (2) and a lower shell (3), the upper end of the middle shell (2) is detachably connected with the upper shell (1), the lower end of the middle shell (2) is detachably connected with the lower shell (3), the motor (12) is fixed in the upper shell (1), and a powder storage cavity (31) is formed in the lower shell (3); the adjusting inner knob (5) is arranged in the middle shell (2) and can ascend and descend, a sleeve one (51) is arranged on the adjusting inner knob (5), a sleeve two (21) is arranged in the middle shell (2), the upper end of the transmission shaft (6) is correspondingly connected with the output end of the motor (12), the lower end of the transmission shaft (6) is fixedly connected with the inner grinding head (7) after sequentially penetrating through the sleeve one (51) and the sleeve two (21), and the outer grinding head (8) is fixed in the middle shell (2); the transmission shaft (6), the sleeve one (51) and the sleeve two (21) are coaxially arranged, the transmission shaft (6) can slide up and down relative to the sleeve one (51) and the sleeve two (21), the upper end of the transmission shaft (6) is fixedly connected with a limiting clamp (53), the limiting clamp (53) is limitedly matched with the upper end surface of the sleeve one (51), and the lower end of the transmission shaft (6) is sleeved with a reset spring (9), and the two ends of the reset spring (9) are respectively abutted against the lower end surface of the sleeve two (21) and the upper end surface of the inner grinding head (7).

2. A portable coffee bean grinder as claimed in claim 1, wherein: A plurality of positioning beads (27) are fixed on the side wall of the middle shell (2), the first ends of the plurality of positioning beads (27) are protruded on the inner wall of the middle shell (2), the second ends of the plurality of positioning beads (27) are arranged on the outer wall of the middle shell (2), the second ends of the plurality of positioning beads (27) are provided with retractable ball beads, an outer thread (54) and a plurality of guide sliding grooves (55) are formed on the adjusting inner knob (5), the guide sliding grooves (55) are correspondingly arranged with the first ends of the positioning beads (27), a limiting groove (42) and an inner thread (43) are formed on the inner wall of the adjusting outer knob (4), the limiting groove (42) is correspondingly arranged with the ball bead of the positioning bead (27), and the inner thread (43) is threadedly connected with the outer thread (54).

3. A portable coffee bean grinder as claimed in claim 2, wherein: ​ 4. The portable coffee bean grinder of claim 2, wherein: The sleeve one (51) is internally provided with bearing one (52) corresponding to the transmission shaft (6), and the sleeve two (21) is internally provided with bearing two (22) corresponding to the transmission shaft (6).

5. The portable coffee bean grinder of claim 2, wherein: The inner grinding head (7) is a circular table structure, the outer wall of the inner grinding head (7) is formed with a grinding inclined surface (71), the inner wall of the outer grinding head (8) is formed with an upper grinding inclined surface (82) and a lower grinding inclined surface (83), an included angle is formed between the upper grinding inclined surface (82) and the grinding inclined surface (71), the lower grinding inclined surface (83) is correspondingly arranged with the grinding inclined surface (71), and the grinding gap (10) is located between the lower grinding inclined surface (83) and the grinding inclined surface (71).

6. The portable coffee bean grinder of claim 2, wherein: The middle shell (2) is internally fixed with a lower fixing seat (24), the outer grinding head (8) is fixed on the lower fixing seat (24) through an upper fixing seat (23), the inner wall of the lower fixing seat (24) is formed with a lower limiting step (241) and a flat position two (242), the outer wall of the outer grinding head (8) is provided with a flat position one (81) corresponding to the flat position two (242), an upper limiting step (231) is formed between the upper fixing seat (23) and the lower fixing seat (24), when the outer grinding head (8) is assembled on the lower fixing seat (24), the upper end surface of the outer grinding head (8) abuts against the upper limiting step (231), and the lower end surface of the outer grinding head (8) abuts against the lower limiting step (241).

7. A portable coffee bean grinder as claimed in claim 6, wherein: The upper end of the lower fixing seat (24) is formed with a mounting groove (243) for fixing the upper fixing seat (23), and the upper fixing seat (23) is threadedly connected with the lower fixing seat (24); the outer wall of the lower fixing seat (24) is tightly attached to the inner wall of the middle shell (2), and the upper end surface of the upper fixing seat (23) is formed with a material guiding inclined surface (232).

8. The portable coffee bean grinder of claim 3, wherein: The outer wall of the adjusting outer knob (4) is formed with anti-skid lines (41).

9. The portable coffee bean grinder of claim 2, wherein: The middle shell (2) is formed with a screwing groove (25), the upper shell (1) is formed with a screwing buckle (15), the screwing buckle (15) is correspondingly arranged with the screwing groove (25), the middle shell (2) is provided with a feeding port, and the feeding port is provided with a detachable cover (26).

10. The portable coffee bean grinder of claim 2, wherein: The output end of the motor (12) is provided with a shaft coupling (13), the shaft coupling (13) is correspondingly connected with the upper end of the transmission shaft (6), the upper shell (1) is internally provided with a storage battery (14), and the upper shell (1) is provided with a charging port (11) and a heat dissipation hole.

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