Coffee machine grinder capable of uniform powder distribution

Abstract

The present invention relates to a coffee machine grinder capable of uniform powder distribution, which aims to solve the technical problems of existing similar products wherein powder discharge channels are easily blocked, the powder distribution effect is poor, resulting in non-uniformity and residue, and the design of in-position detection trigger structures for bean containers is complex. The coffee machine grinder is characterized in that a powder-distribution fan blade is provided in a powder discharge channel at a burr assembly of the coffee machine grinder; a powder mesh sieve is provided at a bottom opening of the powder discharge channel, and the powder mesh sieve is fixed to the bottom opening of the powder discharge channel by means of a powder discharge cover through the engagement of internal and external threads; an electric motor shaft of a powder-distribution electric motor extends into the powder discharge channel and is connected to the powder-distribution fan blade; a spiral blade of the powder-distribution fan blade has a notch on one side; a top opening of the powder discharge channel on one side of the burr assembly may be exposed from the grinder body; self-locking bolt assemblies are symmetrically arranged on inner walls of two sides of the inner bottom of a bean container tray; opening and closing ejector rod assemblies are symmetrically arranged on at least one side of the outer diameter of the bean container tray; and another opening and closing ejector rod assembly is arranged on one side of the position where a bean outlet of the bean container tray is sleeved with an inlet of the burr assembly.

Description

A coffee grinder that evenly distributes coffee powder

[0001] Citation of relevant applications

[0002] This invention claims priority to Chinese Patent Application No. 202411768963.6, filed on December 4, 2024, entitled "A Coffee Machine Grinder with Uniform Powder Distribution", and Chinese Patent Application No. 202422994185.4, filed on December 4, 2024, entitled "A Coffee Machine Grinder with Uniform Powder Distribution", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This invention relates to a coffee grinder with a bean hopper, which is a coffee grinder that evenly distributes coffee powder. Background Technology

[0004] A coffee machine is an electrical appliance used for making coffee. They are generally divided into semi-automatic and fully automatic types. Semi-automatic coffee machines are a traditional Italian style, requiring manual operation for grinding, tamping, filling, brewing, and cleaning. Fully automatic coffee machines automat the entire coffee brewing process, including preheating, cleaning, grinding, tamping, brewing, and dispensing. They brew coffee according to scientific data and procedures and are equipped with comprehensive safety systems. They are convenient to use; a simple press of a button is all it takes to get your coffee. Currently, in typical fully automatic coffee machines, during the grinding process, uneven distribution of coffee grounds and residue in the dispensing channel can occur due to design deviations in the angle of the grinding process. This can lead to insufficient extraction and affect the taste of the coffee. To address this, some existing coffee machines incorporate a powder distribution structure. For example, Chinese patent application number 202211337262.8, published on January 10, 2023, entitled "Coffee Powder Distribution Component, Coffee Powder Distributor, and Coffee Machine," is disclosed. This distribution structure is primarily located at the funnel, not within the powder dropper channel of the grinder. Another example is Chinese patent application number 202411325610.9, published on November 26, 2024, entitled "A Coffee Machine Bean Discharge and Grinding Mechanism." This mechanism uses a microswitch to detect the bean hopper assembly being inserted into the bean hopper base assembly. However, this rib-triggered method has poor stability, is prone to breakage, and is complex and inconvenient to manufacture and repair. Summary of the Invention

[0005] To overcome the above-mentioned shortcomings, the purpose of this invention is to provide a coffee machine grinder with uniform powder distribution, thereby solving the technical problems of existing similar products, such as easy clogging of the powder dispensing channel, poor powder distribution effect, uneven distribution and residue, and complex design of the bean hopper placement detection trigger structure. This objective is achieved through the following technical solution.

[0006] A coffee grinder for evenly distributing coffee powder includes a bean hopper assembly and a grinding assembly. The grinding assembly includes a weighing assembly and a grinding blade assembly. The weighing assembly serves as the base assembly of the bean hopper. The protruding bean inlet at the bottom of the weighing assembly fits into the protruding blade at the top of the grinding blade assembly. The bean inlet in the groove at the top of the bean hopper tray of the weighing assembly is aligned with the bean inlet of the bean hopper assembly. The motor shaft at the grinding motor of the grinding blade assembly is connected to the grinding blade assembly inside the grinding chamber. The weighing assembly and the grinding blade assembly are fixedly mounted on the machine body. The opening of the bean hopper tray at the top of the weighing assembly protrudes from the machine body. A powder outlet channel communicating with the grinding chamber inside the grinding blade assembly is provided on one side of the grinding blade assembly. The key structural design features a powder-distributing fan blade within the powder outlet channel of the grinding assembly. A powder sieve is located at the bottom of the outlet channel, secured to the bottom opening via internal and external threads of the powder outlet cover. The motor shaft of the powder-distributing motor extends into the outlet channel and connects to the powder-distributing fan blade. The top opening of the outlet channel on one side of the grinding assembly may protrude from the machine body. Consequently, in existing coffee machines without a powder-distributing mechanism, coffee powder entering the brewing chamber falls at a forward-tilting angle, easily accumulating unevenly and affecting the brewed taste. In this grinder, the coffee powder, after being evenly distributed by the powder-distributing mechanism, enters the brewing chamber and accumulates evenly.

[0007] The helical blades of the powder-distributing fan have a notch on one side, the notch being 50°-60°, and the height difference between the upper and lower ends of the helical blades is 6mm-7mm. This structure further improves its anti-clogging, anti-residue, and uniform powder distribution effects.

[0008] The inner walls of both sides of the bottom of the bean box tray are symmetrically equipped with self-locking tongue assemblies, and at least one side of the outer diameter of the bean box tray is symmetrically equipped with a switch rod assembly. When the bean box assembly is placed into the top slot of the bean box tray, the protrusion at the rib position at the bottom of the bean box assembly triggers the microswitch of the switch rod assembly. At the same time, the rib position in the buckle groove at the bottom of the bean box assembly is limited and fixed to the self-locking tongue of the self-locking tongue assembly. Thus, during the placement of the bean box assembly, the self-locking tongue assembly locks in place and triggers the microswitch by the pressure of the switch rod assembly. The program confirms that the bean box assembly is installed in place and enters the working state.

[0009] The self-locking tongue assembly includes a tongue fixing cavity, a tongue spring, and a bean box self-locking tongue. The bean box self-locking tongue in the tongue fixing cavity extends out of the tongue fixing cavity through the tongue spring's abutment portion and the protrusion on one side of the tongue fixing cavity and the protrusion on one side of the inner wall of the top groove of the bean box tray. The protrusion on this side of the tongue fixing cavity is fastened and fixed to the outer groove of the protrusion on the bean box tray. When the bean box assembly is placed into the top groove of the bean box tray, the inner rib of the bottom groove of the bean box assembly is limited and fastened to the self-locking tongue extending out of the tongue fixing cavity and the self-locking tongue on the inner wall of the top groove of the bean box tray.

[0010] The switch rod assembly includes a micro switch rod, a rod spring, a pan head screw, a micro switch, a rod bracket, and a bracket screw. The micro switch is fixed in a switch groove on one side of the outer diameter of the bean tray by the pan head screw. The movable spring on one side of the micro switch extends out of the switch groove and is aligned with the contact at one end of the switch rod. The protrusion on the other side of the contact is inserted into the side groove of the top slot of the bean tray, which is protruding and open at the top. The other end of the switch rod is fitted into the rod bracket, which is fixed to the rod bracket and has a rod spring on its outer diameter. The rod bracket is set on the outer diameter of the bean tray on the side of the micro switch by the bracket screw. When the bean tray assembly is placed in the top slot of the bean tray, the protrusion at the bottom of the bean tray assembly presses down on the protrusion of the rod, and the rod moves down, causing the contact to press down on the movable spring of the micro switch opening, triggering the micro switch of the switch rod assembly.

[0011] Another switch rod assembly is provided on the bottom of the bean box tray or on the outer diameter side of the grinding knife assembly, where the bean opening at the bottom protrusion of the bean box tray fits into the blade protrusion at the top of the grinding knife assembly.

[0012] The rear powder outlet channel cover on one side of the grinding blade assembly is integrally formed with the outer shell of the grinding blade assembly, and the front powder outlet channel cover is fastened and fixed to the opening at the rear powder outlet channel cover. The above structure facilitates the assembly and maintenance of the powder distribution fan blades and the powder distribution motor.

[0013] The bottom of the bean box tray is provided with a motor bracket fixing plate, and the bottom of the motor bracket fixing plate is provided with a bean lower gear motor. The motor shaft of the bean lower gear motor passes through the motor bracket fixing plate and is connected to the transmission gear. The transmission gear passes through the bean box tray and is fitted and connected to the gear hole at the bottom of the bean box assembly placed in the top groove of the bean box tray. The bean lower gear motor is set at the bottom of the motor bracket fixing plate through a motor bracket.

[0014] A weighing module is provided on one side of the bottom of the motor bracket fixing plate. The weighing module includes a weighing sensor and a weighing module fixing base. The weighing support of the weighing sensor is attached to the bottom of the motor bracket fixing plate through the sensor bridge arm. The weighing sensor of the weighing module is limited to the weighing fixing base with a gap and swings up, down and left and right. The weighing module is set at the bottom of the motor support of the motor bracket fixing plate.

[0015] An adjustment disc motor is provided on the other side of the bottom of the motor bracket fixing plate. The motor shaft of the adjustment disc motor meshes with the blade adjustment gear on the outer diameter of the grinding head assembly through the adjustment gear. The rotation of the blade adjustment gear drives the moving blade sleeve inside the grinding head assembly to rotate, and the gap between the moving blade sleeve inside the grinding head assembly and the stationary blade inside the grinding head assembly changes. The adjustment disc motor is fixedly installed on the motor support of the motor bracket fixing plate or on one side of the outer shell of the grinding assembly.

[0016] This invention features a reasonable structural design, convenient production and assembly, easy disassembly, easy cleaning, good stability, and long service life. In particular, it ensures uniform powder distribution in the powder outlet channel, minimizing residue buildup, and facilitates easy placement of the bean container assembly, with accurate detection and secure placement. It is suitable for use as a coffee machine grinder for uniform powder distribution and as an improvement on the structure of similar products. Attached Figure Description

[0017] Figure 1 is a three-dimensional structural diagram of the present invention.

[0018] Figure 2 is a schematic diagram of the exploded structure of the grinding tool assembly in Figure 1.

[0019] Figure 3 is a schematic diagram of the exploded structure of the weighing component in Figure 1.

[0020] Figure 4 is a cross-sectional view of the self-locking tongue assembly in Figure 1. Part A is framed in the figure, and the dashed line represents the overall outline of the machine.

[0021] Figure 5 is an enlarged view of part A in Figure 4.

[0022] Figure 6 is a cross-sectional view of the switch rod assembly in Figure 1, with part B outlined in the figure.

[0023] Figure 7 is an enlarged view of part B in Figure 6.

[0024] Figure 8 is a schematic diagram of the bottom three-dimensional structure of Figure 1.

[0025] Figure 9 is a partial internal structure diagram of Figure 8. The bottom cover of the gearbox at the grinding motor and the motor bracket at the bottom of the motor support plate are omitted in the figure.

[0026] Figure 10 is a schematic diagram of the internal structure of the bean box tray after the bean box assembly in Figure 1 has been removed.

[0027] Figure 11 is a schematic diagram of the bottom structure of the three main components in Figure 1 in the exploded state.

[0028] Figure 12 is a magnified schematic diagram of the powder-distributing fan blades in Figure 1.

[0029] Figure 13 is a top view of the structure in Figure 12.

[0030] Figure 14 is a side view of the structure at the notch in Figure 12.

[0031] Attached Figure Numbers and Names: 1. Bean Box Assembly, 2. Bean Grinding Assembly, 3. Powder Dispensing Motor, 4. Rear Powder Dispensing Channel Cover, 5. Front Powder Dispensing Channel Cover, 6. Powder Dispensing Fan Blade, 601. Notch, 7. Powder Screen, 8. Powder Dispensing Cover, 9. Powder Dispensing Motor Fixing Screw, 10. Left Protruding Tongue Fixing Cavity, 11. Left Protruding Tongue Spring, 12. Left Bean Box Self-Locking Protruding Tongue, 13. Right Bean Box Self-Locking Protruding Tongue, 14. Right Protruding Tongue Spring, 15. Right Protruding Tongue Fixing Cavity, 16. Left Microswitch Push Rod, 17. Left Push Rod Spring, 18. Left Pan Head Screw 19. Left micro switch; 20. Right push rod spring; 21. Right pan head screw; 22. Right micro switch push rod; 23. Right micro switch; 24. Left bracket screw; 25. Left push rod bracket; 26. Right bracket screw; 27. Right push rod bracket; 28. Weighing assembly; 29. ​​Bean box tray; 30. Transmission gear; 31. Motor bracket fixing plate; 32. Weighing module; 33. Grinding motor; 34. Adjusting disc motor; 35. Adjusting gear; 36. Bean lowering gear motor; 37. Cutter disc adjusting gear. Detailed Implementation

[0032] The structure and use of the present invention will now be further described with reference to the accompanying drawings. As shown in Figures 1-14, the coffee grinder includes a bean hopper assembly 1 and a grinding assembly 2. The grinding assembly includes a weighing assembly 28 and a grinding blade assembly. The weighing assembly serves as the base assembly of the bean hopper. The protruding bean inlet at the bottom of the weighing assembly fits into the protruding blade at the top of the grinding blade assembly. The bean inlet in the groove at the top of the bean hopper tray 29 of the weighing assembly is aligned with the bean inlet of the bean hopper assembly. The motor shaft at the grinding motor 33 of the grinding blade assembly is connected to the grinding blade assembly inside the grinding chamber. The weighing assembly and the grinding blade assembly are fixedly mounted on the machine body. The opening of the bean hopper tray at the top of the weighing assembly protrudes from the machine body. A powder outlet channel communicating with the grinding chamber inside the grinding blade assembly is provided on one side of the grinding blade assembly. The grinding blade assembly has a powder-distributing fan blade 6 inside its powder outlet channel. A powder sieve 7 is located at the bottom opening of the powder outlet channel, and the sieve is fixed to the bottom opening of the powder outlet channel via an internal and external threaded connection to a powder outlet cover 8. The motor shaft of the powder-distributing motor 3 extends into the powder outlet channel and connects to the powder-distributing fan blade. The powder-distributing motor is fixed to the outer casing of the grinding blade assembly via a powder-distributing motor fixing screw 9 or a clip. The top opening of the powder outlet channel on one side of the grinding blade assembly protrudes from the machine body, and is flush with the opening of the bean tray. A notch 601 is provided on one side of the spiral blade of the powder-distributing fan blade, with a notch angle of 52.43°. The height difference between the upper and lower ends of the spiral blade is 6.52 mm. The rear powder outlet channel cover 4 at one side of the grinding blade assembly's powder outlet channel is integrally formed with the outer casing of the grinding blade assembly, and the front powder outlet channel cover 5 is fastened and fixed to the opening at the rear powder outlet channel cover.

[0033] The inner walls of the bottom of the bean box tray described above are symmetrically provided with self-locking tongue assemblies on both sides, and the outer diameter of the bean box tray is symmetrically provided with switch rod assemblies on at least one side. When the bean box assembly is placed into the top groove of the bean box tray, the protrusion at the rib position at the bottom of the bean box assembly triggers the micro switch of the switch rod assembly. At the same time, the rib position in the buckle groove at the bottom of the bean box assembly is limited and fixed to the self-locking tongue of the self-locking tongue assembly. Specifically, the self-locking tongue assembly includes a tongue fixing cavity, a tongue spring, and a bean box self-locking tongue. The bean box self-locking tongue in the tongue fixing cavity extends out of the tongue fixing cavity through the tongue spring's abutment portion and the protrusion on one side of the tongue fixing cavity and the protrusion on one side of the inner wall of the top groove of the bean box tray. The protrusion on this side of the tongue fixing cavity is fastened and fixed to the outer groove of the protrusion on the bean box tray. When the bean box assembly is placed into the top groove of the bean box tray, the inner rib of the buckle groove at the bottom of the bean box assembly is limited and fastened to the self-locking tongue extending out of the tongue fixing cavity and the self-locking tongue on the inner wall of the top groove of the bean box tray. The switch rod assembly includes a micro switch rod, a rod spring, a pan head screw, a micro switch, a rod bracket, and a bracket screw. The micro switch is fixed in a switch groove on one side of the outer diameter of the bean tray by the pan head screw. The moving spring on one side of the micro switch extends out of the switch groove and aligns with the contact at one end of the switch rod. The protrusion on the other side of the contact is inserted into the side groove of the top slot of the bean tray, which is protruding and open at the top. The other end of the switch rod is fitted into the rod bracket, which is fixed to the rod bracket and has a rod spring on its outer diameter. The rod bracket is set on the outer diameter of the bean tray on the side of the micro switch by the bracket screw. When the bean tray assembly is placed in the top slot of the bean tray, the protrusion at the bottom of the bean tray assembly presses down on the protrusion of the rod, and the rod moves down, causing the contact to press down on the moving spring of the micro switch opening, triggering the micro switch of the switch rod assembly.

[0034] The aforementioned left self-locking tongue assembly includes a left tongue fixing cavity 10, a left tongue spring 11, and a left bean box self-locking tongue 12. The aforementioned right self-locking tongue assembly includes a right bean box self-locking tongue 13, a right tongue spring 14, and a right tongue fixing cavity 15. The aforementioned left switch rod assembly includes a left micro switch rod 16, a left rod spring 17, a left pan head screw 18, a left micro switch 19, a left bracket screw 24, and a left rod bracket 25. The aforementioned right switch rod assembly includes a right rod spring 20, a right pan head screw 21, a right micro switch rod 22, a right micro switch 23, a right bracket screw 26, and a right rod bracket 27. Another switch rod assembly is provided on the bottom of the bean box tray at the bottom of the weighing assembly, where the bean opening mates with the blade edge of the grinding assembly, or on the outer diameter side of the grinding assembly.

[0035] The bottom of the aforementioned bean tray is provided with a motor support fixing plate 31, and a bean-lowering gear motor 36 is located at the bottom of the motor support fixing plate. The motor shaft of the bean-lowering gear motor passes through the motor support fixing plate and is connected to a transmission gear 30. The transmission gear passes through the bean tray and engages with the gear hole at the bottom of the bean-lowering gear exposed in the top slot of the bean tray. The bean-lowering gear motor is mounted on the bottom of the motor support fixing plate via a motor bracket. A weighing module 32 is provided on one side of the bottom of the motor support fixing plate. The weighing module includes a weighing sensor and a weighing module fixing base. The weighing support plate of the weighing sensor is attached to the bottom of the motor support fixing plate via a sensor bridge arm. The weighing sensor of the weighing module is confined within the weighing fixing base with a gap and can swing up, down, left, and right. The weighing module is located at the bottom of the motor bracket of the motor support fixing plate. An adjustment disc motor 34 is provided on the other side of the bottom of the motor bracket fixing plate. The motor shaft of the adjustment disc motor meshes with the blade adjustment gear 37 of the outer diameter of the grinding head assembly through the adjustment gear 35. The rotation of the blade adjustment gear drives the moving blade sleeve inside the grinding head assembly to rotate, and the gap between the moving blade sleeve inside the grinding head assembly and the stationary blade inside the grinding head assembly changes. The adjustment disc motor is fixedly installed on one side of the outer shell of the grinding assembly.

[0036] The specific implementation plan for the coffee grinder is as follows: First, coffee beans are loaded into the bean hopper assembly. Then, the bean hopper assembly with coffee beans is placed into the weighing assembly. During placement, the protrusion on the bottom of the bean hopper assembly presses the right microswitch lever of the weighing assembly to trigger the working mode. At the same time, during the placement of the bean hopper assembly, the bean hopper assembly pushes outward against the two self-locking protrusions on the left and right sides inside the weighing assembly. The self-locking protrusions move outward in a straight line when they are pressed. When they come into contact with the groove area below the bean hopper assembly, the pressure on the self-locking protrusions disappears, and they rebound back to their original position along the original path due to the rebound force of the protrusion spring, locking the bean hopper assembly. The process of removing the bean hopper assembly is the same. Next, after the bean hopper assembly and the weighing assembly lock and trigger the micro switch, the bean grinding begins. The ground coffee powder enters the powder outlet channel. During the powder dispensing process, the powder distribution motor inside the powder outlet channel drives the powder distribution fan blades to rotate. As the powder distribution fan blades rotate, the coffee powder falls evenly from the gaps in the powder distribution fan blades to the bottom, and then passes through the powder sieving screen and falls evenly into the brewing chamber below.

[0037] In summary, this coffee grinder is a uniformly distributed coffee powder grinding system, specifically a working mechanism in a fully automatic coffee machine that ensures even powder distribution. The grinder addresses uneven powder distribution by installing a powder distribution fan and screen at the powder outlet using a powder outlet cover. The powder outlet cover is designed for threaded removal, facilitating the removal of the fan and screen for cleaning. The powder outlet channel consists of a rear powder outlet cover and a front powder outlet cover, secured by a snap-fit ​​mechanism, allowing for easy assembly and disassembly of these components during production.

Claims

1. A coffee grinder for uniformly distributing coffee powder, the coffee grinder comprising a bean hopper assembly (1) and a grinding assembly (2), the grinding assembly comprising a weighing assembly (28) and a grinding blade assembly, the weighing assembly serving as a bean hopper base assembly, the protruding bean inlet at the bottom of the weighing assembly fitting into the protruding blade at the top of the grinding blade assembly, the bean inlet in the groove at the top of the bean hopper tray (29) of the weighing assembly aligning with the bean inlet of the bean hopper assembly, the motor shaft at the grinding motor (33) of the grinding blade assembly connecting to the grinding blade assembly within the grinding chamber, the weighing assembly and the grinding blade assembly being fixedly mounted on the machine body, the opening at the bean hopper tray at the top of the weighing assembly protruding from the machine body, and a powder outlet channel communicating with the grinding chamber within the grinding blade assembly on one side; characterized in that The grinding tool assembly has a powder distribution fan (6) in the powder outlet channel and a powder sieve (7) at the bottom of the powder outlet channel. The powder sieve is fixed to the bottom of the powder outlet channel by the powder outlet cover (8) with internal and external threads. The motor shaft of the powder distribution motor (3) extends into the powder outlet channel and is connected to the powder distribution fan. The top of the powder outlet channel on one side of the grinding tool assembly is exposed outside the machine body.

2. The uniform-dosing coffee grinder for a coffee maker according to claim 1, characterized in that The spiral blade of the powder-distributing fan (6) has a notch (601) on one side, the notch is 50°-60°, and the height difference between the upper and lower ends of the spiral blade of the powder-distributing fan is 6mm-7mm.

3. The uniform-dosing coffee grinder for a coffee maker according to claim 1, characterized in that The inner walls of the bottom sides of the bean box tray (29) are symmetrically provided with self-locking tongue assemblies, and the outer diameter of the bean box tray is symmetrically provided with switch rod assemblies on at least one side. When the bean box assembly (1) is placed in the top groove of the bean box tray, the protrusion at the bottom of the bean box assembly triggers the micro switch of the switch rod assembly. At the same time, the rib at the bottom of the bean box assembly is limited and fixed to the self-locking tongue of the self-locking tongue assembly.

4. The uniform-dosing coffee grinder for a coffee maker according to claim 3, characterized in that The self-locking tongue assembly includes a tongue fixing cavity, a tongue spring, and a bean box self-locking tongue. The bean box self-locking tongue in the tongue fixing cavity extends out of the tongue fixing cavity through the part of the tongue spring in the tongue fixing cavity and the protrusion on one side of the inner wall of the top groove of the bean box tray (29). The protrusion on this side of the tongue fixing cavity is fastened and fixed to the outer groove of the protrusion of the bean box tray. When the bean box assembly (1) is placed in the top groove of the bean box tray, the inner rib of the bottom groove of the bean box assembly is limited and fastened to the self-locking tongue extending out of the tongue fixing cavity and the self-locking tongue on the inner wall of the top groove of the bean box tray.

5. The uniform-dosing coffee grinder of claim 3, wherein The switch rod assembly includes a micro switch rod, a rod spring, a pan screw, a micro switch, a rod bracket, and a bracket screw. The micro switch is fixed in the switch groove on one side of the outer diameter of the bean tray (29) by the pan screw. The moving spring on one side of the micro switch extends out of the switch groove and is aligned with the contact at one end of the switch rod. The protrusion on the other side of the contact is inserted into the side groove of the inner wall of the top groove of the bean tray, which is open at the top. The other end of the switch rod is fitted into the rod bracket, which is fixed to the rod bracket and has a rod spring on its outer diameter. The rod bracket is set on the outer diameter of the bean tray on one side of the micro switch by the bracket screw. When the bean tray assembly (1) is placed in the top groove of the bean tray, the protrusion at the bottom of the bean tray assembly presses down on the protrusion of the rod. The rod moves down and drives the contact to press down on the moving spring of the micro switch opening, triggering the micro switch of the switch rod assembly.

6. The uniform-dosing coffee grinder of claim 5, wherein Another switch rod assembly is provided on the bottom of the bean tray (29) at the bottom protrusion where the bean opening fits into the blade protrusion on the top of the grinding blade assembly, or on the outer diameter side of the grinding blade assembly.

7. The uniform-dosing coffee grinder for a coffee maker according to claim 1, wherein The rear powder outlet channel cover (4) at the powder outlet channel on one side of the grinding tool assembly is integrally formed with the outer shell of the grinding tool assembly, and the front powder outlet channel cover (5) is fastened and fixed to the opening at the rear powder outlet channel cover.

8. The uniform-dosing coffee grinder for a coffee maker according to claim 1, wherein The bottom of the bean tray (29) is provided with a motor bracket fixing plate (31), and the bottom of the motor bracket fixing plate is provided with a bean lower gear motor (36). The motor shaft of the bean lower gear motor passes through the motor bracket fixing plate and is connected to the transmission gear (30). The transmission gear passes through the bean tray and is fitted with the gear hole at the bottom of the bean box assembly placed in the top groove of the bean tray. The bean lower gear motor is set at the bottom of the motor bracket fixing plate through a motor support.

9. The uniform-dosing coffee grinder for a coffee maker according to claim 1, wherein A weighing module (32) is provided on one side of the bottom of the motor bracket fixing plate (31). The weighing module includes a weighing sensor and a weighing module fixing seat. The weighing support of the weighing sensor is attached to the bottom of the motor bracket fixing plate through the sensor bridge arm. The weighing sensor of the weighing module is limited to the weighing fixing seat with a gap and swings up, down and left and right. The weighing module is set at the bottom of the motor support of the motor bracket fixing plate.

10. The uniform-dosing coffee grinder for a coffee maker according to claim 1, wherein An adjustment disc motor (34) is provided on the other side of the bottom of the motor bracket fixing plate (31). The motor shaft of the adjustment disc motor meshes with the blade adjustment gear (37) of the outer diameter of the grinding head assembly through the adjustment gear (35). The rotation of the blade adjustment gear drives the moving blade sleeve inside the grinding head assembly to rotate. The gap between the moving blade sleeve inside the grinding head assembly and the stationary blade inside the grinding head assembly changes. The adjustment disc motor is fixedly installed on the motor support of the motor bracket fixing plate or on the outer shell of the grinding assembly.

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