Hand grinder

Abstract

The utility model provides a hand-cranked coffee bean grinder, comprising a hand-cranked handle, a cover, a housing, a powder cup, a rotating shaft, a movable grinding wheel, a fixed grinding wheel, a cover and a speed reduction mechanism, wherein the speed reduction mechanism comprises a first gear, a second gear and a third gear rotatably supported on the cover, wherein the first gear is provided with a first central axis, the first central axis extends in the axial direction of the rotating shaft and is connected to the cover, the second gear is provided with a second central axis, the second central axis extends in the axial direction of the rotating shaft and can be sleeved on the driving end of the rotating shaft, and the third gear is provided with a primary gear and a secondary gear, the primary gear is meshed with the first gear, the secondary gear is meshed with the second gear, and the pitch circle diameter of the primary gear is larger than the pitch circle diameter of the first gear and the pitch circle diameter of the secondary gear, and the pitch circle diameter of the second gear is larger than the pitch circle diameter of the secondary gear. The utility model hand-cranked coffee bean grinder can make the cranking drive of the hand-cranked handle easy and labor-saving, thereby improving the user experience.

Description

Technical Field

[0001] The utility model relates to the technical field of coffee bean grinding equipment, in particular to a hand-cranked coffee bean grinder. Background Art

[0002] The existing hand-cranked coffee bean grinder includes a driving handle, a box body and a powder box. The driving handle is rotatably arranged on the box body through a cover body, and the driving handle is connected to the movable grinding wheel through a central axis. A fixed grinding wheel is arranged in the box body, and a powder outlet gap is provided between the fixed grinding wheel and the movable grinding wheel. The powder box and the box body are detachably arranged at the powder outlet gap. When in use, the user holds the driving handle and rotates it around the box body, thereby driving the cover body to rotate relative to the box body, and synchronously driving the central axis to rotate, so as to drive the movable grinding wheel to rotate, so that the coffee beans are ground into coffee powder between the movable grinding wheel and the fixed grinding wheel, and the coffee powder flows from the powder outlet gap between the fixed grinding wheel and the movable grinding wheel to the powder box for collection.

[0003] However, the grinding action of the existing hand-cranked coffee grinders to drive the moving grinding wheel to rotate to grind the coffee beans directly comes from the shaking force of the user holding the driving handle and shaking it. Therefore, the user is required to hold and apply a large shaking force to the driving handle to drive the moving grinding wheel to rotate to grind the coffee beans. Especially when grinding harder coffee beans, the user holds and applies a larger shaking force to the driving handle. A larger or greater shaking force is not friendly to users with less strength, especially ladies with less strength find it difficult to easily shake the driving handle, which affects the user experience. Summary of the invention

[0004] In order to achieve the main purpose of the utility model, the utility model provides a hand-cranked coffee grinder, which makes the cranking drive of the hand crank handle easy and labor-saving, thereby improving the user experience.

[0005] In order to achieve the main purpose of the utility model, the utility model provides a hand-cranked coffee bean grinder, including a hand-cranked handle, a cover cap, a casing, a powder cup, a rotating shaft, a movable grinding wheel, a fixed grinding wheel, a machine cover and a reduction mechanism, wherein the driving end of the hand-cranked handle is detachably connected to the cover cap, the casing is provided with a bean grinding chamber, the rotating shaft can be rotatably supported around its own rotation axis on a support frame in the bean grinding chamber, the fixed grinding wheel is arranged in the discharge port of the bean grinding chamber, the movable grinding wheel is located in the axial hole of the fixed grinding wheel and is arranged on the rotating shaft, and a grinding gap is formed between the movable grinding wheel and the fixed grinding wheel, the powder cup is detachably connected to one end of the casing near the discharge port so that the accommodating chamber of the powder cup is connected to the bean grinding chamber through the grinding gap, and the machine cover is detachably connected to the cover cap. At the other end of the casing close to the feed port of the grinding chamber, the reduction mechanism includes a first gear, a second gear and a third gear rotatably supported on the cover, the first gear is provided with a first center shaft, the first center shaft extends in the axial direction of the rotating shaft and is connected to the cover cap, the second gear is provided with a second center shaft, the second center shaft extends in the axial direction of the rotating shaft and can be sleeved on the driving end of the rotating shaft, the third gear is provided with a primary gear and a secondary gear, the primary gear is meshed with the first gear, the secondary gear is meshed with the second gear, and the pitch circle diameter of the primary gear is larger than the pitch circle diameter of the first gear and the pitch circle diameter of the secondary gear, and the pitch circle diameter of the second gear is larger than the pitch circle diameter of the secondary gear.

[0006] It can be seen from the above scheme that when the hand-cranked coffee bean grinder of the utility model is used for grinding coffee beans, the coffee beans are placed into the grinding bean chamber from the feed port of the grinding bean chamber of the casing, the powder cup is assembled on one end of the casing close to the feed port of the grinding bean chamber, and the machine cover is assembled on the other end of the casing close to the feed port of the grinding bean chamber, so that the second center axis of the second gear rotatably supported on the machine cover is sleeved on the driving end of the rotating shaft, and the driving end of the hand crank handle is assembled on the cap, so that the user holds the handle end of the hand crank handle and gives the hand crank handle a driving force to rotate. As the hand crank handle rotates, the driving end of the hand crank handle synchronously drives the cap to rotate. The first center axis on the first gear supported on the machine cover is connected to the cover cap, and the first gear supported on the machine cover is synchronously driven to rotate relative to the machine cover. Since the first gear of the third gear is meshed with the first gear, and the second gear of the third gear is meshed with the second gear, the rotational driving force is transmitted to the second gear sleeved on the driving end of the rotating shaft, thereby driving the rotating shaft to rotate around its own rotation axis, and synchronously driving the movable grinding wheel on the rotating shaft to rotate, so as to grind the coffee beans between the movable grinding wheel and the fixed grinding wheel into coffee powder, and the coffee powder flows from the grinding gap between the movable grinding wheel and the fixed grinding wheel to the accommodating chamber of the powder cup for collection.

[0007] Therefore, the hand-cranked coffee bean grinder of the utility model is provided with a reduction mechanism, which includes a first gear, a second gear and a third gear rotatably supported on the machine cover, the first center axis on the first gear is connected to the cover cap, the second center axis on the second gear can be sleeved on the driving end of the rotating shaft, the first gear of the third gear is meshed with the first gear, and the second gear of the third gear is meshed with the second gear. Since the pitch circle diameter of the first gear of the utility model is larger than the pitch circle diameter of the first gear and the pitch circle diameter of the second gear, and the pitch circle diameter of the second gear is larger than the pitch circle diameter of the second gear, the user only needs to give the hand crank handle a smaller shaking driving force. After the smaller shaking driving force changes speed through the first gear, the second gear and the third gear of the reduction mechanism, it can give the rotating shaft a larger rotational driving force, making the shaking drive of the hand crank handle easy and labor-saving, thereby improving the user experience.

[0008] A preferred solution is that an outer wall of the cap is provided with a plug-in hole, and the driving end of the hand crank handle can be detachably inserted into the plug-in hole, and a first through hole is provided through the driving end of the hand crank handle, and the locking end of the fastener passes through the first through hole and is threadedly connected to the first center axis to lock the driving end of the hand crank handle on the first center axis.

[0009] A further solution is that a plug-in hole is arranged through the cover cap, and the driving end of the hand crank can be detachably inserted into the plug-in hole, and a second through hole is opened through the driving end of the hand crank, and the locking end of the fastener can pass through the first through hole or the second through hole to be threadedly connected to the first center axis, and the second through hole is arranged perpendicular to the first through hole; when the locking end of the fastener passes through the first through hole to be threadedly connected to the first center axis, the hand crank is in a cranking state in a radial direction of the rotating shaft, away from the casing; when the locking end of the fastener passes through the second through hole to be threadedly connected to the first center axis, the hand crank is in a retracted state in a radial direction of the rotating shaft, close to the casing.

[0010] A further solution is that the machine cover includes a first shell cover and a second shell cover, the first shell cover and the second shell cover are connected to form a accommodating cavity, the first gear is rotatably supported on the first shell cover and is located in the accommodating cavity, the first center shaft passes through the first shell cover and is threadedly connected to the cover cap; the second gear is rotatably supported on the second shell cover and is located in the accommodating cavity, the driving end of the rotating shaft is inserted through the second shell cover and can be plugged into the second center shaft, a limiting shaft is arranged in the accommodating cavity, and the third gear is rotatably mounted on the limiting shaft.

[0011] A further solution is that a first convex ring is protrudingly provided on the inner end surface of the first shell cover, and the first end of the third gear in the axial direction of the rotating shaft is adjacent to the first convex ring; and / or, a second convex ring is protrudingly provided on the inner end surface of the second shell cover, and the second end of the third gear in the axial direction of the rotating shaft is adjacent to the second convex ring; and / or, the first gear and the second gear both rotate around the rotation axis, and a third convex ring is protrudingly provided on the end surface of the first gear close to the second gear, and one end of the second gear in the axial direction of the rotating shaft is adjacent to the third convex ring, or, a fourth convex ring is protrudingly provided on the end surface of the second gear close to the first gear, and one end of the first gear in the axial direction of the rotating shaft is adjacent to the fourth convex ring; and / or, a positioning column is protrudingly provided on the axis of the second gear, and the first gear is rotatably mounted on the positioning column.

[0012] A further solution is that a plurality of L-shaped elastic hooks are protruding from the inner circumferential wall of the feed port, and the plurality of L-shaped elastic hooks are evenly distributed in the circumferential direction of the grinding bean chamber, the first elastic arm of each L-shaped elastic hook extends in the circumferential direction of the grinding bean chamber, and the second elastic arm of each L-shaped elastic hook extends in the axial direction of the grinding bean chamber, an end of the first elastic arm away from the second elastic arm is protruding with an elastic hook toward the extension direction of the second elastic arm, and an elastic groove is formed between the elastic hook, the first elastic arm and the second elastic arm; a plurality of L-shaped rigid hooks are protruding from the bottom end of the machine cover, one L-shaped rigid hook is adapted to one L-shaped elastic hook, the first rigid arm of each L-shaped rigid hook extends in the circumferential direction of the grinding bean chamber, and the second rigid arm of each L-shaped rigid hook extends in the axial direction of the grinding bean chamber, one end of the first rigid arm away from the second rigid arm is protruding with a rigid hook toward the extension direction of the second rigid arm, a rigid groove is formed between the rigid hook, the first rigid arm and the second rigid arm, the elastic hook can be inserted into the rigid groove by interference fit, and the rigid hook can be inserted into the elastic groove by interference fit.

[0013] A further solution is that the movable grinding wheel can be movably sleeved on the rotating shaft on the rotation axis, and the hand-cranked coffee bean grinder also includes a spring and an adjusting knob. The spring is sleeved on the rotating shaft and pressed between the support frame and the movable grinding wheel. The adjusting knob is threadedly sleeved on the rotating shaft and is located on the rotating axis at the adjusting end of the movable grinding wheel away from the spring.

[0014] A further solution is that a gear plate is provided at the adjustment end of the movable grinding wheel, and a plurality of spherical grooves are provided on the gear end face of the gear plate adjacent to the adjusting knob on the rotation axis, and the plurality of spherical grooves are evenly distributed around the rotation axis, and a spherical protrusion is protruding from the adjustment end face of the adjusting knob adjacent to the gear plate on the rotation axis, and the spherical protrusion is embedded in a spherical groove.

[0015] A further solution is that the hand-cranked coffee grinder also includes an elastic silicone seat, which is arranged at the bottom of the powder cup, and the bottom end surface of the elastic silicone seat away from the powder cup is concave and has a concave suction groove.

[0016] A further solution is that the outer peripheral wall of the elastic silicone seat is concavely provided with an annular groove; and / or the elastic silicone seat is glued to the bottom of the powder cup. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural diagram from the first perspective of an embodiment of the hand-cranked coffee grinder of the utility model.

[0018] Figure 2 This is a structural diagram from a second viewing angle of an embodiment of the hand-cranked coffee grinder of the utility model.

[0019] Figure 3 It is a cross-sectional view of an embodiment of the hand-cranked coffee bean grinder of the utility model.

[0020] Figure 4 It is an exploded view of an embodiment of the hand-cranked coffee bean grinder of the utility model.

[0021] Figure 5 This is a first partial structural exploded view of the hand-cranked coffee bean grinder embodiment of the utility model.

[0022] Figure 6 This is a first partial structural sectional view of an embodiment of the hand-cranked coffee bean grinder of the utility model.

[0023] Figure 7 It is a structural diagram of the hand crank handle in the embodiment of the hand crank coffee bean grinder of the utility model.

[0024] Figure 8 It is a structural diagram of the second gear in the embodiment of the hand-cranked coffee grinder of the utility model.

[0025] Fig. 9 It is a structural diagram of the second shell cover in the embodiment of the hand-cranked coffee grinder of the utility model.

[0026] Fig.10 This is a second partial structural diagram of the hand-cranked coffee bean grinder embodiment of the utility model.

[0027] Fig.11 It is a second partial structural sectional view of the embodiment of the hand-cranked coffee bean grinder of the utility model.

[0028] Fig.12 This is a second partial structural exploded view of the hand-cranked coffee bean grinder embodiment of the utility model.

[0029] Fig.13 It is a structural diagram of the gear plate in the embodiment of the hand-cranked coffee grinder of the utility model.

[0030] Fig.14 It is a cross-sectional view of the cooperation between the L-shaped rigid hook and the L-shaped elastic hook in the embodiment of the hand-cranked coffee grinder of the utility model.

[0031] Fig.15It is a third partial structural sectional view of the embodiment of the hand-cranked coffee bean grinder of the utility model.

[0032] Fig.16 It is a cross-sectional view of the elastic silica gel seat in the embodiment of the hand-cranked coffee bean grinder of the utility model.

[0033] Fig.17 It is a structural diagram of the hand-cranked coffee bean grinder embodiment of the utility model in the storage state.

[0034] The present invention will be further described below with reference to the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0035] See also Figures 1 to 16 The present embodiment discloses a hand-cranked bean grinder 10, comprising a hand crank handle 11, a cover 12, a housing 14, a powder cup 15, a rotating shaft 21, a moving grinding wheel 23, a fixed grinding wheel 24, a cover 13 and a speed reduction mechanism, wherein the driving end of the hand crank handle 11 is detachably connected to the cover 12. In the present embodiment, the housing 14 is provided with a grinding chamber 141, the rotating shaft 21 is rotatably supported on a support frame 142 in the grinding chamber 141 around its own rotating axis 21, the fixed grinding wheel 24 is arranged in the discharge port of the grinding chamber 141, the moving grinding wheel 23 is located in the shaft hole of the fixed grinding wheel 24 and is arranged on the rotating shaft 21, and a grinding gap 25 is formed between the moving grinding wheel 23 and the fixed grinding wheel 24, and the powder cup 15 is detachably connected to one end of the housing 14 near the discharge port, so that the accommodating chamber of the powder cup 15 is connected to the grinding chamber 141 through the grinding gap 25. Meanwhile, the cover 13 of this embodiment is detachably connected to the other end of the housing 14 near the feed port of the grinding chamber 141, and the speed reduction mechanism includes a first gear 18, a second gear 19, and a third gear 20 rotatably supported on the cover 13. The first gear 18 is provided with a first central axis 181, which extends in the axial direction of the rotating shaft 21 and is connected to the cap 12, and the second gear 19 is provided with a second central axis 191, which extends in the axial direction of the rotating shaft 21 and can be sleeved on the driving end 211 of the rotating shaft 21. In addition, the third gear 20 of this embodiment is provided with a primary gear 201 and a secondary gear 202, the primary gear 201 is meshed with the first gear 18, the secondary gear 202 is meshed with the second gear 19, and the pitch circle diameter of the primary gear 201 is larger than the pitch circle diameter of the first gear 18 and the pitch circle diameter of the secondary gear 202, and the pitch circle diameter of the second gear 19 is larger than the pitch circle diameter of the secondary gear 202.

[0036] When the hand-cranked coffee bean grinder 10 of the present embodiment is used for grinding coffee beans, coffee beans are placed into the grinding bean chamber 141 from the feed port of the grinding bean chamber 141 of the machine housing 14, the powder cup 15 is mounted on one end of the machine housing 14 close to the discharge port of the grinding bean chamber 141, and the machine cover 13 is mounted on the other end of the machine housing 14 close to the feed port of the grinding bean chamber 141, so that the second center axis 191 of the second gear 19 rotatably supported on the machine cover 13 is sleeved on the driving end 211 of the rotating shaft 21, and the driving end 211 of the hand crank 11 is mounted on the cap 12, so that the user holds the handle end of the hand crank 11 and gives the hand crank 11 a driving force to rotate. As the hand crank 11 rotates, the driving end 211 of the hand crank 11 synchronously drives the cap 12 to rotate. The first center axis 181 on the first gear 18 on the cover 13 is connected to the cover cap 12, and the first gear 18 supported on the cover 13 is synchronously driven to rotate relative to the cover 13. Since the first gear 201 of the third gear 20 is meshed with the first gear 18, and the second gear 202 of the third gear 20 is meshed with the second gear 19, the rotational driving force is transmitted to the second gear 19 sleeved on the driving end 211 of the rotating shaft 21, so as to drive the rotating shaft 21 to rotate around its own rotating axis 21 line, and synchronously drive the movable grinding wheel 23 on the rotating shaft 21 to rotate, so as to grind the coffee beans between the movable grinding wheel 23 and the fixed grinding wheel 24 into coffee powder, and the coffee powder flows from the grinding gap 25 between the movable grinding wheel 23 and the fixed grinding wheel 24 to the accommodating chamber of the powder cup 15 for collection.

[0037] Therefore, the hand-cranked coffee bean grinder 10 of this embodiment is provided with a speed reduction mechanism, which includes a first gear 18, a second gear 19 and a third gear 20 rotatably supported on the machine cover 13. The first central shaft 181 on the first gear 18 is connected to the cap 12, and the second central shaft 191 on the second gear 19 can be sleeved on the driving end 211 of the rotating shaft 21. The first gear 201 of the third gear 20 is meshed with the first gear 18, and the second gear 202 of the third gear 20 is meshed with the second gear 19. The pitch circle diameter of the first gear 201 is larger than the pitch circle diameter of the first gear 18 and the pitch circle diameter of the second gear 202, and the pitch circle diameter of the second gear 19 is larger than the pitch circle diameter of the second gear 202, so that the user only needs to give a smaller shaking driving force to the hand crank 11. After the smaller shaking driving force changes speed through the first gear 18, the second gear 19 and the third gear 20 of the reduction mechanism, it can give the rotating shaft 21 a larger rotational driving force, making the shaking drive of the hand crank 11 easy and labor-saving, thereby improving the user experience.

[0038] Combination Figures 5 to 9In this embodiment, the outer wall of the cap 12 is provided with a plug hole 121, and the driving end of the hand crank 11 can be detachably inserted into the plug hole 121, and the driving end of the hand crank 11 is penetrated by a first through hole 111. The locking end of the fastener 17 passes through the first through hole 111 and is threadedly connected to the first center axis 181 to lock the driving end 211 of the hand crank 11 on the first center axis 181, thereby avoiding the shaking of the hand crank 11 during the shaking of the hand crank 11, or even the separation of the hand crank 11 from the cap 12, so as to ensure the shaking accuracy and stability of the hand crank 11.

[0039] Specifically, in this embodiment, the plug hole 121 is set through the cover cap 12, and the driving end 211 of the hand crank 11 can be detachably inserted into the plug hole 121, and the driving end 211 of the hand crank 11 is penetrated by a second through hole 112, and the locking end of the fastener 17 can pass through the first through hole 111 or the second through hole 112 to be threadedly connected with the first central axis 181, and the second through hole 112 is arranged perpendicular to the first through hole 111. When the locking end of the fastener 17 passes through the first through hole 111 and is threadedly connected with the first central axis 181, the hand crank 11 is in a cranking state in which it is extended away from the housing 14 in the radial direction of the rotating shaft 21; when the locking end of the fastener 17 passes through the second through hole 112 and is threadedly connected with the first central axis 181, the hand crank 11 is in a retracted state in which it is close to the housing 14 in the radial direction of the rotating shaft 21. Therefore, when the user uses the hand-cranked coffee bean grinder 10 of this embodiment to grind coffee beans, the locking end of the fastener 17 is passed through the first through hole 111 of the hand crank 11 and is threadedly connected to the first central axis 181, so that the hand crank 11 is spread out in the radial direction of the rotating shaft 21 away from the housing 14 and is in a cranking state. Figure 1 As shown, the user can hold the handle end of the hand crank 11 and give the hand crank 11 a driving force to drive the hand crank 11 to rotate. When the hand crank grinder 10 of this embodiment is not needed, the hand crank grinder 10 of this embodiment is stored, and the locking end of the fastener 17 is passed through the second through hole 112 of the hand crank 11 and is threadedly connected to the first central shaft 181, so that the hand crank 11 is retracted in the radial direction of the rotating shaft 21 close to the housing 14 and is in a storage state, as shown in FIG. Fig.17 As shown, the overall volume of the hand-cranked coffee bean grinder 10 of this embodiment is reduced to a minimum state, which is convenient for users to store and carry. In addition, the hand-cranked coffee bean grinder 10 of this embodiment only needs to open an additional second through hole 112 at the driving end 211 of the hand crank handle 11, so that the second through hole 112 is arranged perpendicular to the first through hole 111, so that the hand-cranked coffee bean grinder 10 can be reduced in volume to facilitate users to store and carry, with a simple structure and a simple production process.

[0040] Furthermore, the machine cover 13 of this embodiment includes a first shell cover 131 and a second shell cover 132, and the first shell cover 131 and the second shell cover 132 are connected to form a receiving cavity (not marked), the first gear 18 is rotatably supported on the first shell cover 131 and is located in the receiving cavity, the first center shaft 181 passes through the first shell cover 131 and is threadedly connected to the cap 12, and the second gear 19 is rotatably supported on the second shell cover 132 and is located in the receiving cavity, the driving end 211 of the rotating shaft 21 is inserted through the second shell cover 132 and can be plugged into the second center shaft 191, a limit shaft 1322 is set in the receiving cavity, and the third gear 20 is rotatably sleeved on the limit shaft 1322. Specifically, in this embodiment, the inner end surface of the second shell cover 132 is protrudingly provided with the limiting shaft 1322, and the end of the limiting shaft 1322 away from the second shell cover 132 is inserted into the limiting hole of the first shell cover 131, thereby ensuring the rotation working stability and reliability of the third gear 20 rotatably mounted on the limiting shaft 1322. In addition, in the present embodiment, a first convex ring (not shown) is protrudingly provided on the inner end surface of the first shell cover 131, and the first end of the third gear 20 in the axial direction of the rotating shaft 21 is adjacent to the first convex ring to reduce the friction between the inner end surface of the first shell cover 131 and the third gear 20, thereby ensuring the rotational working stability and reliability of the third gear 20; in the present embodiment, a second convex ring 1321 is protrudingly provided on the inner end surface of the second shell cover 132, and the second end of the third gear 20 in the axial direction of the rotating shaft 21 is adjacent to the second convex ring 1321 to reduce the friction between the inner end surface of the second shell cover 132 and the third gear 20, thereby ensuring the rotational working stability and reliability of the third gear 20; in the present embodiment, the first gear 18 and the second gear 19 both rotate around the rotating shaft 21 The first gear 18 is rotated, and a third convex ring 182 is protrudingly provided on the end surface of the first gear 18 close to the second gear 19, and one end of the second gear 19 in the axial direction of the rotating shaft 21 is adjacent to the third convex ring 182, or, a fourth convex ring (not shown) is protrudingly provided on the end surface of the second gear 19 close to the first gear 18, and one end of the first gear 18 in the axial direction of the rotating shaft 21 is adjacent to the fourth convex ring, thereby reducing the friction between the first gear 18 and the second gear 19, thereby ensuring the rotational working stability and reliability of the first gear 18 and the second gear 19; in this embodiment, a positioning column 192 is protrudingly provided on the axis of the second gear 19, and the first gear 18 is rotatably sleeved on the positioning column 192, to ensure the rotational working stability and reliability of the first gear 18.

[0041] Among them, the second central axis 191 on the second gear 19 of this embodiment is provided with a polygonal groove 1911, and the radial cross section of the driving end 211 of the rotating shaft 21 is set in a polygonal shape, so that the second central axis 191 is sleeved on the driving end 211 of the rotating shaft 21 through its polygonal groove 1911, so as to ensure that the second central axis 191 stably and reliably drives the rotating shaft 21 to rotate synchronously. In addition, in this embodiment, the first shell cover 131 is provided with a mounting hole 1311, and the second shell cover 132 is provided with a threaded column 1323. The threaded end of the screw (not shown) passes through the mounting hole 1311 and is connected to the threaded column 1323, so as to fasten the first shell cover 131 and the second shell cover 132 to form a sealed accommodating cavity. Since the head of the screw is located on the outer end surface of the first shell cover 131, a decorative layer 28 is provided on the outer end surface of the first shell cover 131 to improve the aesthetic appearance.

[0042] Combination Figures 10 to 13 In this embodiment, the movable grinding wheel 23 can be movably sleeved on the rotating shaft 21 on the rotation axis of the rotating shaft 21. The hand-cranked coffee bean grinder 10 also includes a spring 22 and an adjusting knob 27. The spring 22 is sleeved on the rotating shaft 21 and pressed between the support frame 142 and the movable grinding wheel 23. The adjusting knob 27 is threadedly sleeved on the rotating shaft 21 and is located on the rotation axis of the rotating shaft 21 at the adjusting end of the movable grinding wheel 23 away from the spring 22. Therefore, when the adjusting knob 27 is rotated outward, the movable grinding wheel 23 can move outward with the adjusting knob 27 under the action of the spring 22, or, when the adjusting knob 27 is rotated inward, the movable grinding wheel 23 can move inward with the adjusting knob 27 under the push of the adjusting knob 27. Therefore, when the adjusting knob 27 is rotated, the adjusting knob 27 can push the movable grinding wheel 23 to move on the rotation axis of the rotating shaft 21 relative to the rotating shaft 21, so as to adjust the grinding gap 25 between the movable grinding wheel 23 and the fixed grinding wheel 24, and then adjust the coarse and fine particle size of the coffee powder ground by the two to meet the different needs of users.

[0043] In order to accurately adjust the grinding gap 25 between the movable grinding wheel 23 and the fixed grinding wheel 24, a gear plate 26 is provided at the adjustment end of the movable grinding wheel 23 of the present embodiment. The gear plate 26 is provided with a plurality of spherical grooves 261 on the gear end face adjacent to the adjusting knob 27 on the rotation axis of the rotating shaft 21. The plurality of spherical grooves 261 are evenly distributed around the rotation axis of the rotating shaft 21. The adjusting knob 27 is provided with a spherical protrusion 271 protruding from the adjustment end face adjacent to the gear plate 26 on the rotation axis of the rotating shaft 21. The spherical protrusion 271 is embedded in a spherical groove 261, so that the spring 22 forces the movable grinding wheel 23 on the rotation axis of the rotating shaft 21 to drive the gear plate 26 to abut against the adjusting knob 27. The user controls the adjusting knob 27 to rotate, and the adjustment of the adjusting knob 27 is controlled by the user. The spherical protrusion 271 on the end surface is screwed out from a spherical groove 261 on the gear end surface of the gear plate 26 and pressed against the gear end surface of the gear plate 26. With the continued rotation of the adjusting knob 27, the spherical protrusion 271 on the adjusting end surface of the adjusting knob 27 is screwed into and embedded in the next spherical groove 261 on the gear end surface of the gear plate 26, thereby realizing precise adjustment of the grinding gap 25 formed between the movable grinding wheel 23 and the fixed grinding wheel 24. In the process of rotating the adjusting knob 27 to adjust the grinding gap 25 formed between the movable grinding wheel 23 and the fixed grinding wheel 24, the user can clearly feel the click feeling of the gear switching between two adjacent spherical grooves 261, so that the adjustment perception of the grinding gap 25 is good, thereby improving the user experience.

[0044] Combination Fig.14In this embodiment, a plurality of L-shaped elastic hooks 281 are protrudingly provided on the inner circumferential wall of the feed port of the grinding bean chamber 141, and the plurality of L-shaped elastic hooks 281 are evenly distributed in the circumferential direction of the grinding bean chamber 141. The first elastic arm 2812 of each L-shaped elastic hook 281 extends in the circumferential direction of the grinding bean chamber 141, and the second elastic arm 2811 of each L-shaped elastic hook 281 extends in the axial direction of the grinding bean chamber 141. An elastic buckle 1813 is protrudingly provided at one end of the first elastic arm 2812 away from the second elastic arm 2811 toward the extension direction of the second elastic arm 2811, and an elastic groove 2814 is formed between the elastic buckle 1813, the first elastic arm 2812 and the second elastic arm 2811, and a plurality of L-shaped rigid hooks 1324 are protrudingly provided on the bottom end of the cover 13 of this embodiment, and one L-shaped rigid hook 1324 is adapted to one L-shaped elastic hook 281, and each L-shaped rigid hook 132 The first rigid arm 13242 of the L-shaped rigid hook 1324 extends in the circumferential direction of the grinding chamber 141, and the second rigid arm 13241 of each L-shaped rigid hook 1324 extends in the axial direction of the grinding chamber 141. A rigid buckle 13243 is provided at one end of the first rigid arm 13242 away from the second rigid arm 13241 and protrudes toward the extending direction of the second rigid arm 13241. A rigid groove 13244 is formed between the rigid buckle 13243, the first rigid arm 13242 and the second rigid arm 13241. The elastic buckle 1813 can be inserted into the rigid groove 13244 by interference fit, and the rigid buckle 13243 can be inserted into the elastic groove 2814 by interference fit, so that a stable interference hooking is formed between the L-shaped elastic hook 281 and the L-shaped rigid hook 1324, so that the fitting between the detachably connected L-shaped elastic hook 281 and the L-shaped rigid hook 1324 is stable, and the interference assembly sealing of the two is improved.

[0045] Specifically, the hand-cranked bean grinder 10 of this embodiment further includes an elastic ring 28, the outer peripheral wall of the elastic ring 28 is provided with an elastic external thread (not marked), the inner peripheral wall of the feed port of the grinding bean chamber 141 is provided with a rigid internal thread (not marked), the elastic ring 28 is located in the feed port of the grinding bean chamber 141, the elastic external thread of the elastic ring 28 cooperates with the rigid internal thread of the feed port of the grinding bean chamber 141, and the inner peripheral wall of the elastic ring 28 is protrudingly provided with a plurality of L-shaped elastic hooks 281. Since the elastic ring 28 has an elastic buffering effect, it can greatly reduce the grinding vibration amplitude, thereby reducing the grinding noise, and further improving the user experience. Furthermore, the bottom end of the second shell cover 132 of the machine cover 13 of this embodiment is protrudingly provided with a plurality of L-shaped rigid hooks 1324.

[0046] Combination Fig.15 and Fig.16The hand-cranked coffee grinder 10 of this embodiment further includes an elastic silicone seat 16, which is disposed at the bottom of the powder cup 15. The bottom end surface of the elastic silicone seat 16 away from the powder cup 15 is concave and has a concave suction groove 162, so that the bottom end surface of the elastic silicone seat 16 can be adsorbed on the placement table, and the elastic silicone seat 16 has elastic viscosity, which increases the contact friction with the placement table, so that it is convenient for the user to apply a cranking driving force to the hand crank 11 during the grinding process. Specifically, the powder cup 15 of this embodiment is detachably threadedly connected to one end of the housing 14 near the discharge port, and the elastic silicone seat 16 of this embodiment is glued to the bottom of the powder cup 15. In order to further improve the elasticity of the elastic silicone seat 16, the outer peripheral wall of the elastic silicone seat 16 of this embodiment is concave and has an annular groove 161.

[0047] The above embodiments are only preferred examples of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made based on the structure, features and principles of the present invention should be included in the scope of the present invention patent application.

Claims

1. A hand-cranked coffee bean grinder, comprising a hand-cranked handle, a cap, a housing, a powder cup, a rotating shaft, a movable grinding wheel and a fixed grinding wheel, wherein the driving end of the hand-cranked handle is detachably connected to the cap, the housing is provided with a grinding chamber, the rotating shaft can be rotatably supported around its own rotation axis on a support frame in the grinding chamber, the fixed grinding wheel is arranged in a discharge port of the grinding chamber, the movable grinding wheel is located in an axial hole of the fixed grinding wheel and is arranged on the rotating shaft, and a grinding gap is formed between the movable grinding wheel and the fixed grinding wheel, the powder cup is detachably connected to one end of the housing near the discharge port, so that the accommodating chamber of the powder cup is connected to the grinding chamber through the grinding gap, and the characteristics are: The hand-cranked coffee bean grinder further comprises a machine cover and a speed reduction mechanism, wherein the machine cover is detachably connected to the other end of the machine housing close to the feed port of the coffee bean grinding chamber, and the speed reduction mechanism comprises a first gear, a second gear and a third gear rotatably supported on the machine cover, wherein the first gear is provided with a first central shaft, which extends in the axial direction of the rotating shaft and is connected to the cap, and the second gear is provided with a second central shaft, which extends in the axial direction of the rotating shaft and can be sleeved on the driving end of the rotating shaft; The third gear is provided with a primary gear and a secondary gear, the primary gear is meshed with the first gear, the secondary gear is meshed with the second gear, and the pitch circle diameter of the primary gear is larger than the pitch circle diameter of the first gear and the pitch circle diameter of the secondary gear, and the pitch circle diameter of the second gear is larger than the pitch circle diameter of the secondary gear.

2. The hand-cranked coffee grinder according to claim 1, characterized in that: An insert hole is provided on the outer peripheral wall of the cap, and the driving end of the hand crank handle can be detachably inserted into the insert hole, and a first through hole is provided through the driving end of the hand crank handle, and the locking end of the fastener passes through the first through hole and is threadedly connected to the first center axis to lock the driving end of the hand crank handle on the first center axis.

3. The hand-cranked coffee grinder according to claim 2, characterized in that: The plug hole is set through the cap, the driving end of the hand crank can be detachably inserted into the plug hole, and the driving end of the hand crank is penetrated by a second through hole, the locking end of the fastener can pass through the first through hole or the second through hole to be threadedly connected with the first central axis, and the second through hole is perpendicular to the first through hole; When the locking end of the fastener passes through the first through hole and is threadedly connected to the first central shaft, the hand crank is spread out in the radial direction of the rotating shaft away from the housing and is in a cranking state; When the locking end of the fastener passes through the second through hole and is threadedly connected to the first central shaft, the hand crank is retracted and close to the housing in the radial direction of the rotating shaft and is in a storage state.

4. The hand-cranked coffee grinder according to claim 1, characterized in that: The machine cover comprises a first shell cover and a second shell cover, the first shell cover and the second shell cover are connected to form a receiving cavity, the first gear is rotatably supported on the first shell cover and is located in the receiving cavity, and the first central axis passes through the first shell cover and is threadedly connected to the cap; The second gear is rotatably supported on the second shell cover and is located in the accommodating cavity. The driving end of the rotating shaft is inserted through the second shell cover and can be plugged into the second center shaft. A limiting shaft is set in the accommodating cavity, and the third gear is rotatably sleeved on the limiting shaft.

5. The hand-cranked coffee grinder according to claim 4, characterized in that: A first convex ring is protruding from the inner end surface of the first shell cover, and the first end of the third gear in the axial direction of the rotating shaft is adjacent to the first convex ring; And / or, a second convex ring is protruding from the inner end surface of the second housing cover, and the second end of the third gear in the axial direction of the rotating shaft is adjacent to the second convex ring; And / or, the first gear and the second gear both rotate around the rotation axis, and a third convex ring is protrudingly provided on the end surface of the first gear close to the second gear, and one end of the second gear in the axial direction of the rotating shaft is adjacent to the third convex ring, or a fourth convex ring is protrudingly provided on the end surface of the second gear close to the first gear, and one end of the first gear in the axial direction of the rotating shaft is adjacent to the fourth convex ring; And / or, a positioning column is protruding from the axis of the second gear, and the first gear is rotatably sleeved on the positioning column.

6. The hand-cranked coffee grinder according to claim 1, characterized in that: The inner peripheral wall of the feed port is protrudingly provided with a plurality of L-shaped elastic hooks, and the plurality of L-shaped elastic hooks are evenly distributed in the circumferential direction of the grinding bean chamber, the first elastic arm of each of the L-shaped elastic hooks extends in the circumferential direction of the grinding bean chamber, and the second elastic arm of each of the L-shaped elastic hooks extends in the axial direction of the grinding bean chamber, an elastic buckle is protrudingly provided at one end of the first elastic arm away from the second elastic arm toward the extension direction of the second elastic arm, and an elastic groove is formed between the elastic buckle, the first elastic arm and the second elastic arm; A plurality of L-shaped rigid hooks are protruding from the bottom end of the machine cover, one of the L-shaped rigid hooks is matched with one of the L-shaped elastic hooks, a first rigid arm of each of the L-shaped rigid hooks extends in the circumferential direction of the grinding bean chamber, and a second rigid arm of each of the L-shaped rigid hooks extends in the axial direction of the grinding bean chamber, a rigid buckle is protruding from one end of the first rigid arm away from the second rigid arm toward the extension direction of the second rigid arm, a rigid groove is formed between the rigid buckle, the first rigid arm and the second rigid arm, the elastic buckle can be inserted into the rigid groove by interference fit, and the rigid buckle can be inserted into the elastic groove by interference fit.

7. The hand-cranked coffee grinder according to claim 1, characterized in that: The movable grinding wheel is movably sleeved on the rotating shaft on the rotating axis. The hand-cranked coffee bean grinder also includes a spring and an adjusting knob. The spring is sleeved on the rotating shaft and pressed between the support frame and the movable grinding wheel. The adjusting knob is threadedly sleeved on the rotating shaft and is located on the rotating axis at an adjusting end of the movable grinding wheel away from the spring.

8. The hand-cranked coffee grinder according to claim 7, characterized in that: The adjusting end of the movable grinding wheel is provided with a gear plate, and the gear plate is provided with a plurality of spherical grooves on the gear end surface adjacent to the adjusting knob on the rotation axis, and the plurality of spherical grooves are evenly distributed around the rotation axis, and the adjusting knob is provided with a spherical protrusion protruding from the adjusting end surface adjacent to the gear plate on the rotation axis, and the spherical protrusion is embedded in one of the spherical grooves.

9. The hand-cranked coffee grinder according to any one of claims 1 to 8, characterized in that: The hand-cranked coffee grinder also includes an elastic silicone seat, which is arranged at the bottom of the powder cup. The bottom end surface of the elastic silicone seat away from the powder cup is concave and has a concave suction groove.

10. The hand-cranked coffee grinder according to claim 9, characterized in that: The outer peripheral wall of the elastic silicone seat is concavely provided with an annular groove; And / or, the elastic silicone seat is glued to the bottom of the powder cup.

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