Safe bean grinder

Abstract

The utility model provides a safety type bean grinder which comprises a machine shell, a grinding box, a grinding assembly, an upper cover assembly and a protection assembly, a trigger part is arranged on the upper cover assembly, the protection assembly comprises a microswitch, a transmission part and an elastic reset part, the microswitch is electrically connected in a control circuit of the grinding assembly, and the transmission part is electrically connected in the control circuit of the grinding assembly. The transmission part is arranged between the microswitch and the upper cover assembly, when the upper cover assembly covers the opening of the machine shell, the trigger part pushes the transmission part to press the elastic piece of the microswitch so as to trigger the microswitch, and at the moment, the grinding assembly can be opened; the elastic reset piece is used for resetting the transmission piece to enable the transmission piece to leave the elastic piece of the microswitch when the upper cover assembly is opened, and when the upper cover assembly is opened, the elastic reset piece resets the transmission piece to enable the transmission piece to leave the elastic piece of the microswitch, at the moment, the microswitch is not triggered, and the grinding assembly stops operating. The problem that the grinding assembly still rotates when the upper cover assembly of the bean grinder is opened is avoided, and therefore the safety of the bean grinder is improved.

Description

Technical Field

[0001] The utility model relates to the field of electrical appliances, and particularly relates to a safe coffee grinder. Background Art

[0002] A coffee grinder is a machine specifically used to grind coffee beans into powder. The coffee grinder clamps and grinds the coffee beans through the cooperation of a rotating moving grinding disc and fixed grinding teeth, and finally produces uniform powder suitable for brewing coffee. After daily use of the coffee grinder, it is necessary to clean the coffee grinder, and when the coffee grinder fails, it is necessary to disassemble the machine for maintenance. When the cover of the existing coffee grinder is opened for cleaning or maintenance, there is a situation where the grinding assembly inside the coffee grinder is still rotating, which will affect the safety of the coffee grinder and pose a safety hazard. Summary of the Utility Model

[0003] Aiming at the deficiencies of the prior art, the utility model provides a safe coffee grinder, which can prevent the grinding assembly from still rotating when the cover of the coffee grinder is opened.

[0004] The technical solution of the utility model is realized as follows:

[0005] A safe coffee grinder includes a machine shell, a grinding box, a grinding assembly, an upper cover assembly and a protection assembly. The grinding box, the grinding assembly and the protection assembly are all arranged inside the machine shell. The upper cover assembly is provided with a triggering part. The protection assembly includes a micro switch, a transmission part and an elastic reset part. The micro switch is electrically connected to the control circuit of the grinding assembly. The transmission part is arranged between the micro switch and the upper cover assembly. When the upper cover assembly is closed at the opening of the machine shell, the triggering part pushes the transmission part to press against the elastic piece of the micro switch to trigger the micro switch. The elastic reset part is used to reset the transmission part when the upper cover assembly is opened so that the transmission part leaves the elastic piece of the micro switch.

[0006] Preferably, the grinding box has a grinding cavity with an upper opening. The upper cover assembly includes a cover body and a fixing part. The edge of the fixing part is provided with a brim. The fixing part is placed on the top surface of the grinding box through the brim and covers the opening of the grinding cavity. The triggering part is a convex point arranged at the bottom of the brim. The transmission part is a pressure column arranged below the convex point. The elastic piece of the micro switch is located below the pressure column. The elastic reset part is a first spring sleeved outside the pressure column. An installation seat is arranged inside the machine shell. The micro switch is installed on the installation seat. The pressure column is telescopically arranged on the installation seat. An abutting part is arranged on the outer wall of the pressure column. The two ends of the first spring respectively abut against the abutting part and the installation seat.

[0007] Preferably, a ring-shaped flange is arranged at the top of the grinding box. A through hole corresponding to the pressure column is arranged on the flange. The through hole can accommodate the convex point. The upper end of the pressure column extends into the through hole.

[0008] Preferably, the grinding assembly includes a stationary grinding disc, a rotating grinding disc, a bracket, and a driving motor. The bracket has a body portion and a rotating shaft protruding from the bottom surface of the body portion. The body portion is placed in the grinding chamber. The rotating grinding disc is fixed to the bottom surface of the body portion and is located above the stationary grinding disc. The rotating shaft passes through the rotating grinding disc and the stationary grinding disc and extends towards the bottom of the grinding chamber. The output shaft of the driving motor passes through the bottom of the grinding box and is in transmission connection with the rotating shaft.

[0009] Preferably, the rotating shaft is sleeved outside the output shaft of the driving motor. The upper end of the output shaft of the driving motor is hexagonal, and the upper end of the inner cavity of the rotating shaft is hexagonal. The upper end of the output shaft of the driving motor is inserted into the upper end of the inner cavity of the rotating shaft.

[0010] Preferably, the upper cover assembly further includes a lifting member. The lifting member is installed at the center of the inner top surface of the cover body. A threaded hole is provided at the center of the fixing member. The middle part of the lifting member is screwed into the threaded hole. The lower end of the lifting member abuts against the top surface of the bracket. The upper end of the output shaft of the driving motor has a cavity with an upper opening. A second spring is provided in the cavity to always press the bracket against the upper cover assembly. When the cover body rotates, it drives the lifting member to rotate relative to the fixing member to drive the bracket to move up and down, so as to adjust the distance between the stationary grinding disc and the rotating grinding disc.

[0011] Preferably, the upper cover assembly further includes a chuck provided in the cover body. A clamping hole is provided in the middle of the chuck. The upper end of the lifting member is clamped in the clamping hole. A plurality of clamping teeth are provided on the side wall of the chuck. A clamping strip is provided on the inner wall of the cover body. The clamping strip is clamped in the space between two adjacent clamping teeth.

[0012] Preferably, the upper cover assembly further includes a mating ring provided between the lifting member and the bracket. The middle part of the bottom surface of the lifting member extends downward to form an extension portion. The extension portion extends into the inner hole of the mating ring. The top surface of the mating ring abuts against the bottom surface of the lifting member. The bottom surface of the mating ring abuts against the top surface of the bracket.

[0013] Preferably, the upper cover assembly further includes an annular decorative cover. The decorative cover is sleeved outside the fixing member. The bottom of the cover body is located inside the ring of the decorative cover. The outer wall of the decorative cover is aligned with the outer wall of the casing.

[0014] Preferably, one side of the grinding box is provided with a feed inlet, and the other side is provided with a discharge outlet. Both the feed inlet and the discharge outlet communicate with the grinding chamber. The stationary grinding disc and the rotating grinding disc are located in the upper part of the grinding chamber. The feed inlet is provided in the lower part of the grinding box, and the discharge outlet is provided in the upper part of the grinding box. A channel communicating the discharge outlet and the outside is provided on the mounting seat. One end of the channel extends outside the casing. An inlet is provided on the casing corresponding to the feed inlet. The coffee beans enter the grinding chamber after passing through the inlet and the feed inlet in sequence. The coffee powder generated after being ground by the stationary grinding disc and the rotating grinding disc is discharged from the discharge outlet through the channel.

[0015] Compared with the prior art, the beneficial effects of the present utility model are:

[0016] The bean grinder includes a housing, a grinding assembly, an upper cover assembly and a protection assembly. The protection assembly includes a microswitch, a transmission part and an elastic reset part. The upper cover assembly is provided with a trigger part. When the upper cover assembly is closed at the opening of the housing, the trigger part pushes the transmission part to press against the elastic sheet of the microswitch so as to trigger the microswitch. The microswitch is electrically connected to the control circuit of the grinding assembly. At this time, the grinding assembly can be turned on. When the upper cover assembly is opened, the elastic reset part resets the transmission part so that the transmission part leaves the elastic sheet of the microswitch. At this time, the microswitch is not triggered and the grinding assembly stops operating to avoid the grinding assembly still rotating when the upper cover assembly of the bean grinder is opened, thereby improving the safety of the bean grinder. Description of the Drawings

[0017] Figure 1 is a three-dimensional cross-sectional view of the present utility model;

[0018] Figure 2 is a schematic diagram of the internal structure of the present utility model;

[0019] Figure 3 is a cross-sectional view of the grinding box, the upper cover assembly and the protection assembly of the present utility model;

[0020] Figure 4 is a three-dimensional structural schematic diagram of the protection assembly in the present utility model;

[0021] Figure 5 is a three-dimensional structural schematic diagram of the fixing part in the present utility model;

[0022] Figure 6 is a three-dimensional structural schematic diagram of the grinding box in the present utility model;

[0023] Figure 7 is a three-dimensional cross-sectional view of the grinding assembly in the present utility model;

[0024] Figure 8 is a three-dimensional cross-sectional view of the upper cover assembly in the present utility model;

[0025] Figure 9 is an exploded view of the upper cover assembly in the present utility model;

[0026] Figure 10 is a three-dimensional structural schematic diagram of the cover body in the present utility model.

[0027] Reference Signs:

[0028] 1 - housing; 11 - inlet;

[0029] 2 - grinding box; 21 - grinding chamber; 22 - flange; 221 - through hole; 23 - feed port; 24 - discharge port;

[0030] 3 - Grinding assembly; 31 - Fixed grinding disc; 32 - Rotating grinding disc; 33 - Driving motor; 331 - Output shaft of the driving motor; 332 - Cavity; 34 - Bracket; 341 - Body part; 342 - Rotating shaft; 35 - Second spring;

[0031] 4 - Upper cover assembly; 41 - Cover body; 411 - Clamping strip; 42 - Lifting member; 421 - Extension part; 43 - Fixing member; 431 - Threaded hole; 432 - Rim; 433 - Protrusion; 44 - Chuck; 441 - Clamping hole; 442 - Clamping teeth; 45 - Fitting ring; 46 - Screw; 47 - Bolt; 48 - Cover plate; 49 - Decorative cover;

[0032] 5 - Protection assembly; 51 - Micro switch; 511 - Spring piece of the micro switch; 52 - Pressing column; 521 - Abutting part; 53 - First spring; 54 - Mounting seat; 541 - Channel. Detailed implementation manners

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0034] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, unless otherwise clearly specified and defined, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0035] See Figures 1 to 3, this embodiment provides a safe coffee grinder, which includes a housing 1, a grinding box 2, a grinding assembly 3, an upper cover assembly 4 and a protection assembly 5. The grinding box 2, the grinding assembly 3 and the protection assembly 5 are all arranged inside the housing 1. The upper cover assembly 4 is provided with a trigger part. The protection assembly 5 includes a micro switch 51, a transmission part and an elastic reset part. The micro switch 51 is electrically connected to the control circuit of the grinding assembly 3. The transmission part is arranged between the micro switch 51 and the upper cover assembly 4. When the upper cover assembly 4 covers the opening of the housing 1, the trigger part pushes the transmission part to press against the elastic piece 511 of the micro switch 51 to trigger the micro switch 51. The elastic reset part is used to reset the transmission part when the upper cover assembly 4 is opened so that the transmission part leaves the elastic piece 511 of the micro switch 51.

[0036] Due to the setting of the protection assembly 5, the protection assembly 5 includes a micro switch 51, a transmission part and an elastic reset part. The upper cover assembly 4 is provided with a trigger part. When the upper cover assembly 4 covers the opening of the housing 1, the trigger part pushes the transmission part to press against the elastic piece 511 of the micro switch 51 to trigger the micro switch 51. The micro switch 51 is electrically connected to the control circuit of the grinding assembly 3. At this time, the grinding assembly 3 can be turned on; when the upper cover assembly 4 is opened, the elastic reset part resets the transmission part so that the transmission part leaves the elastic piece 511 of the micro switch 51. At this time, the micro switch 51 is not triggered and the grinding assembly 3 stops operating to prevent the grinding assembly from still rotating when the upper cover assembly of the coffee grinder is opened, thereby improving the safety of the coffee grinder.

[0037] In this embodiment, refer to Figures 1 to 6, the grinding box 2 has an upper-opening grinding cavity 21. The upper cover assembly 4 includes a cover body 41 and a fixing member 43. A brim 432 is provided at the edge of the fixing member 43. The fixing member 43 is placed on the top surface of the grinding box 2 through the brim 432 and covers the opening of the grinding cavity 21. The triggering part is a bump 433 provided at the bottom of the brim 432. The transmission member is a pressing column 52 provided below the bump 433. The elastic piece 511 of the microswitch 51 is located below the pressing column 52. The elastic resetting member is a first spring 53 sleeved outside the pressing column 52. An installation seat 54 is provided in the machine shell 1. The microswitch 51 is installed on the installation seat 54. The pressing column 52 is telescopically arranged on the installation seat 54. An abutting portion 521 is provided on the outer wall of the pressing column 52. The two ends of the first spring 53 respectively abut against the abutting portion 521 and the installation seat 54. When the upper cover assembly 4 is closed at the opening of the machine shell 1, the bump 433 of the fixing member 43 pushes the pressing column 52 downward to press the elastic piece 511 of the microswitch 51, thereby triggering the microswitch 51. The microswitch 51 is electrically connected to the control circuit of the grinding assembly 3. At this time, the grinding assembly 3 can be turned on, and the first spring 53 is compressed. When the upper cover assembly 4 is opened, the fixing member 43 is pulled out. At this time, the resilience of the first spring 53 resets the pressing column 52 so that the pressing column 52 leaves the elastic piece 511 of the microswitch 51. At this time, the microswitch 51 is not triggered, and the grinding assembly 3 stops operating to ensure that the grinding assembly can be prevented from still rotating when the cover of the bean grinder is opened, thereby improving the safety of the bean grinder. In fact, the installation seat 54 is not limited to Figure 4 the described structure, and other shaped structures can also be adopted as long as they can install the microswitch 51 and telescopically install the pressing column 52.

[0038] Preferably, referring to Figures 3 to 6 , a ring-shaped flange 22 is provided at the top of the grinding box 2. A through hole 221 corresponding to the position of the pressing column 52 is provided on the flange 22. The through hole 221 can accommodate the bump 433. The upper end of the pressing column 52 extends into the through hole 221. The setting of the through hole 221 enables the bump 433 of the fixing member 43 to be aligned with and press against the upper end of the pressing column 52 when the upper cover assembly 4 is installed, thereby ensuring that the microswitch 51 can be triggered when the upper cover assembly 4 is closed. In addition, the upper end of the pressing column 52 extends into the through hole 221, which can ensure the stability of the up-and-down movement of the pressing column 52, play a limiting role for the pressing column 52, and prevent the pressing column 52 from generating horizontal displacement.

[0039] Referring to Figure 1 and Figure 7, in this embodiment, the grinding assembly 3 includes a fixed grinding disc 31, a movable grinding disc 32, a bracket 34, and a driving motor 33. The bracket 34 has a main body portion 341 and a rotating shaft 342 protruding from the bottom surface of the main body portion 341. The main body portion 341 is placed in the grinding chamber 21. The movable grinding disc 32 is fixed to the bottom surface of the main body portion 341 and is located above the fixed grinding disc 31. The rotating shaft 342 passes through the movable grinding disc 32 and the fixed grinding disc 31 and extends towards the bottom of the grinding chamber 21. The output shaft 331 of the driving motor 33 passes through the bottom of the grinding box 2 and is in transmission connection with the rotating shaft 342. When the microswitch 51 is triggered, the output shaft 331 of the driving motor 33 rotates and drives the bracket 34 and the movable grinding disc 32 to rotate through the rotating shaft 342, so as to grind the coffee beans in the grinding chamber 21.

[0040] Preferably, the rotating shaft 342 is sleeved outside the output shaft 331 of the driving motor 33. The upper end of the output shaft 331 of the driving motor 33 is hexagonal, and the upper end of the inner cavity of the rotating shaft 342 is hexagonal. The upper end of the output shaft 331 of the driving motor 33 is inserted into the upper end of the inner cavity of the rotating shaft 342. Since the rotating shaft 342 of the bracket 34 is sleeved outside the output shaft 331 of the driving motor 33 and the rotating shaft 342 is not fixedly connected to the output shaft 331 of the driving motor 33, and the movable grinding disc 32 is fixed to the bottom surface of the main body portion 341 of the bracket 34, when cleaning is required, the bracket 34 can be directly pulled out from the grinding chamber 21, and the bracket 34 together with the movable grinding disc 32 is removed, which is convenient for cleaning the movable grinding disc 32. Moreover, after the bracket 34 and the movable grinding disc 32 are removed, the grinding chamber 21 and the fixed grinding disc 31 in the grinding chamber 21 can be cleaned to avoid affecting the grinding effect; the upper end of the output shaft 331 of the driving motor 33 is hexagonal, and the upper end of the inner cavity of the rotating shaft 342 is hexagonal. The upper end of the output shaft 331 of the driving motor 33 is inserted into the upper end of the inner cavity of the rotating shaft 342, so that the rotating shaft 342 rotates with the output shaft 331 of the driving motor 33, and the rotating shaft 342 will not rotate relative to the output shaft 331 of the driving motor 33.

[0041] Preferably, referring to Figure 1 , Figures 7 to 9 , the upper cover assembly 4 further includes a lifting member 42. The lifting member 42 is installed at the center of the inner top surface of the cover body 41. A threaded hole 431 is provided at the center of the fixing member 43. The middle part of the lifting member 42 is screwed into the threaded hole 431. The lower end of the lifting member 42 abuts against the top surface of the bracket 34. The upper end of the output shaft 331 of the driving motor 33 has a cavity 332 with an upper opening. A second spring 35 is provided in the cavity 332 to always press the bracket 34 against the upper cover assembly 4. When the cover body 41 rotates, it drives the lifting member 42 to rotate relative to the fixing member 43 to drive the bracket 34 to move up and down, so as to adjust the distance between the fixed grinding disc 31 and the movable grinding disc 32.

[0042] The second spring 35 can always press the bracket 34 against the upper cover assembly 4, ensuring that the upper cover assembly 4 can drive the bracket 34 to move up and down to adjust the distance between the fixed grinding disc 31 and the moving grinding disc 32. The greater the distance between the fixed grinding disc 31 and the moving grinding disc 32, the coarser the ground coffee powder; the smaller the distance between the fixed grinding disc 31 and the moving grinding disc 32, the finer the ground coffee powder.

[0043] Since the second spring 35 is arranged in the cavity 332 of the output shaft 331 of the drive motor, and the rotating shaft 342 is sleeved outside the output shaft 331 of the drive motor 33, the second spring 35 can be hidden inside the rotating shaft 342, avoiding contact between the second spring 35 and the coffee powder in the grinding chamber 21, thus keeping the second spring 35 clean and reducing the cleaning difficulty of the coffee grinder.

[0044] The fixing member 43 is threadedly connected to the lifting member 42 through its threaded hole 431, ensuring the stability of the lifting of the lifting member 42. When the cover body 41 rotates, the lifting member 42 located at the center of the inner top surface of the cover body 41 rotates with the cover body 41. Under the cooperation of the threaded hole 431 of the fixing member 43, the lifting member 42 moves up and down relative to the fixing member 43 while rotating, and at the same time, the lifting member 42 drives the bracket 34 to move up and down to adjust the distance between the fixed grinding disc 31 and the moving grinding disc 32. In use, first, rotate the cover body 41 according to the brewing method and personal taste requirements. The cover body 41 drives the bracket 34 to move up and down through the lifting member 42 to adjust the distance between the fixed grinding disc 31 and the moving grinding disc 32. Then, put coffee beans into the grinding chamber 21, start the drive motor 33, and the drive motor 33 drives the bracket 34 and the moving grinding disc 32 arranged on the bracket 34 to rotate. Under the grinding action of the moving grinding disc 32 and the fixed grinding disc 31, coffee powder is formed.

[0045] In this embodiment, referring to Figure 1 、 Figures 7 to 9 The upper cover assembly 4 further includes a bolt 47. The bolt 47 passes through the cover body 41 and is screwed to the lifting member 42 to install the lifting member 42 at the center of the inner top surface of the cover body 41. In order to hide the bolt 47, a cover plate 48 can be provided on the top surface of the cover body 41 to cover the bolt 47. The cover plate 48 is snap-fitted on the top surface of the cover body 41 for easy installation. In addition, the brim 432 of the fixing member 43 is connected to the top surface of the grinding box 2 through screws 46. The number of screws 46 is not limited. In this embodiment, the fixing member 43 and the grinding box 2 are connected by four screws 46.

[0046] Preferably, referring to Figure 1 、 Figures 7 to 10, the upper cover assembly 4 further includes a chuck 44 disposed inside the cover body 41. A clamping hole 441 is provided in the middle of the chuck 44. The upper end of the lifting member 42 is clamped in the clamping hole 441. A plurality of clamping teeth 442 are provided on the side wall of the chuck 44, and a clamping strip 411 is provided on the inner wall of the cover body 41. The clamping strip 411 is clamped in the space between two adjacent clamping teeth 442. The clamping strip 411 is clamped in the space between two adjacent clamping teeth 442, and a clamping groove is formed between two adjacent clamping teeth 442. The clamping strip 411 is clamped in the clamping groove to fix the chuck 44 and the cover body 41 to each other. The chuck 44 and the lifting member 42 are fixed to each other, which can prevent the lifting member 42 from not rotating when the cover body 41 rotates, so as to ensure that the cover body 41 can drive the chuck 44 and the lifting member 42 to rotate when rotating.

[0047] Preferably, referring to Figure 1 , Figures 7 to 9 , the upper cover assembly 4 further includes a mating ring 45 disposed between the lifting member 42 and the bracket 34. A central portion of the bottom surface of the lifting member 42 extends downward to form an extension portion 421. The extension portion 421 extends into the inner hole of the mating ring 45. The top surface of the mating ring 45 abuts against the bottom surface of the lifting member 42, and the bottom surface of the mating ring 45 abuts against the top surface of the bracket 34. During the rotation and vertical movement of the lifting member 42, the mating ring 45 does not rotate, but the mating ring 45 will move up and down with the lifting member 42 under the action of the second spring 35, which can prevent the lifting member 42 from directly abutting against the bracket 34 and causing the bracket 34 to be worn.

[0048] Preferably, referring to Figure 1 , Figures 7 to 9 , the upper cover assembly 4 further includes an annular decorative cover 49. The decorative cover 49 is sleeved outside the fixing member 43. The bottom of the cover body 41 is located inside the ring of the decorative cover 49. The outer wall of the decorative cover 49 is aligned with the outer wall of the housing 1. The setting of the decorative cover 49 covers the gap between the cover body 41 and the fixing member 43 to prevent water from entering, and the outer wall of the decorative cover 49 is aligned with the outer wall of the housing 1, making the appearance of the coffee grinder more tidy.

[0049] Preferably, referring to Figure 1 and Figure 6, one side of the grinding box 2 is provided with a feed inlet 23, and the other side is provided with a discharge outlet 24. Both the feed inlet 23 and the discharge outlet 24 communicate with the grinding chamber 21. The fixed grinding disc 31 and the moving grinding disc 32 are located in the upper part of the grinding chamber 21. The feed inlet 23 is arranged at the lower part of the grinding box 2, and the discharge outlet 24 is arranged at the upper part of the grinding box 2. The mounting seat 54 is provided with a channel 541 communicating the discharge outlet 24 and the outside. One end of the channel 541 extends outside the machine housing 1. The machine housing 1 is provided with an inlet 11 corresponding to the position of the feed inlet 23. The coffee beans enter the grinding chamber 21 after passing through the inlet 11 and the feed inlet 23 in sequence. The coffee powder generated after being ground by the fixed grinding disc 31 and the moving grinding disc 32 is discharged from the channel 541 through the discharge outlet 24. The coffee beans enter the grinding box 2 from the lower part of the grinding box 2 and are discharged from the upper part of the grinding box 2 after being ground. The fixed grinding disc 31 and the moving grinding disc 32 are located in the upper part of the grinding chamber 21, which can ensure that the coffee beans pass through the area where the fixed grinding disc 31 and the moving grinding disc 32 are located and ensure that the coffee beans are ground.

[0050] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A safe coffee grinder, characterized in that, it includes a housing, a grinding box, a grinding assembly, an upper cover assembly and a protection assembly. The grinding box, the grinding assembly and the protection assembly are all arranged in the housing. A trigger part is provided on the upper cover assembly. The protection assembly includes a microswitch, a transmission part and an elastic reset part. The microswitch is electrically connected to the control circuit of the grinding assembly. The transmission part is arranged between the microswitch and the upper cover assembly. When the upper cover assembly covers the opening of the housing, the trigger part pushes the transmission part against the elastic piece of the microswitch to trigger the microswitch. The elastic reset part is used to reset the transmission part when the upper cover assembly is opened so that the transmission part leaves the elastic piece of the microswitch.

2. The safe coffee grinder according to claim 1, characterized in that, the grinding box has a grinding cavity with an upper opening. The upper cover assembly includes a cover body and a fixing part. The edge of the fixing part is provided with a brim. The fixing part is placed on the top surface of the grinding box through the brim and covers the opening of the grinding cavity. The trigger part is a bump provided at the bottom of the brim. The transmission part is a pressure column provided below the bump. The elastic piece of the microswitch is located below the pressure column. The elastic reset part is a first spring sleeved outside the pressure column. An installation seat is provided in the housing. The microswitch is installed on the installation seat. The pressure column is telescopically arranged on the installation seat. An abutting part is provided on the outer wall of the pressure column. The two ends of the first spring respectively abut against the abutting part and the installation seat.

3. The safe coffee grinder according to claim 2, characterized in that, a ring-shaped flange is provided at the top of the grinding box. A through hole corresponding to the pressure column is provided on the flange. The through hole can accommodate the bump. The upper end of the pressure column extends into the through hole.

4. The safe coffee grinder according to claim 2, characterized in that, the grinding assembly includes a fixed grinding disc, a moving grinding disc, a bracket and a driving motor. The bracket has a body part and a rotating shaft protruding from the bottom surface of the body part. The body part is placed in the grinding cavity. The moving grinding disc is fixed on the bottom surface of the body part and is located above the fixed grinding disc. The rotating shaft passes through the moving grinding disc and the fixed grinding disc and extends to the bottom of the grinding cavity. The output shaft of the driving motor passes through the bottom of the grinding box and is in transmission connection with the rotating shaft.

5. The safe coffee grinder according to claim 4, characterized in that, the rotating shaft is sleeved outside the output shaft of the driving motor. The upper end of the output shaft of the driving motor is hexagonal. The upper end of the inner cavity of the rotating shaft is hexagonal. The upper end of the output shaft of the driving motor is inserted into the upper end of the inner cavity of the rotating shaft.

6. The safe coffee grinder according to claim 4, characterized in that, The upper cover assembly further includes a lifting member, which is installed at the center of the inner top surface of the cover body. A threaded hole is provided at the center of the fixing member, and the middle part of the lifting member is screwed into the threaded hole. The lower end of the lifting member abuts against the top surface of the bracket. The upper end of the output shaft of the driving motor has a cavity with an upper opening, and a second spring is provided in the cavity to always press the bracket against the upper cover assembly. When the cover body rotates, it drives the lifting member to rotate relative to the fixing member to drive the bracket to move up and down, thereby adjusting the distance between the fixed grinding disc and the moving grinding disc.

7. The safe coffee grinder according to claim 6, wherein the upper cover assembly further includes a chuck provided in the cover body. A clamping hole is provided in the middle of the chuck, and the upper end of the lifting member is clamped in the clamping hole. A plurality of clamping teeth are provided on the side wall of the chuck, and a clamping strip is provided on the inner wall of the cover body. The clamping strip is clamped in the space between two adjacent clamping teeth.

8. The safe coffee grinder according to claim 6, wherein the upper cover assembly further includes a fitting ring provided between the lifting member and the bracket. A middle part of the bottom surface of the lifting member extends downward to form an extension part, and the extension part extends into the inner hole of the fitting ring. The top surface of the fitting ring abuts against the bottom surface of the lifting member, and the bottom surface of the fitting ring abuts against the top surface of the bracket.

9. The safe coffee grinder according to claim 2, wherein the upper cover assembly further includes an annular decorative cover, which is sleeved outside the fixing member. The bottom of the cover body is located inside the ring of the decorative cover, and the outer wall of the decorative cover is aligned with the outer wall of the machine shell.

10. The safe coffee grinder according to claim 4, wherein one side of the grinding box is provided with a feed inlet, and the other side is provided with a discharge outlet. Both the feed inlet and the discharge outlet communicate with the grinding chamber. The fixed grinding disc and the moving grinding disc are located in the upper part of the grinding chamber. The feed inlet is provided in the lower part of the grinding box, and the discharge outlet is provided in the upper part of the grinding box. A channel communicating the discharge outlet and the outside is provided on the mounting seat, and one end of the channel extends outside the machine shell. An inlet is provided on the machine shell corresponding to the feed inlet. Coffee beans enter the grinding chamber after passing through the inlet and the feed inlet in sequence, and the coffee powder generated after being ground by the fixed grinding disc and the moving grinding disc is discharged from the channel through the discharge outlet.

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