Grinding powder amount control system and method

Abstract

According to the grinding powder amount control system and method, physical quantities such as grinding wheel gap variation and the number of turns of rotation of a grinding wheel related to the total gram weight of powder are mapped into electric signals, the mapped electric signals are calculated through an MCU, and the total gram weight of the powder is calculated and controlled from the two aspects of granularity and the total amount; and the total powder grinding amount can be accurately controlled.

Description

Technical Field

[0001] The present invention belongs to the technical field of beverage preparation devices, and in particular relates to a grinding powder amount control system and method. Background Art

[0002] Coffee is a widely popular beverage. Drinking coffee in moderation is good for health. The most important part of the coffee making process is the grinding of coffee beans. The coarseness and amount of ground coffee powder directly determine the extraction method of coffee, and different extraction methods produce different flavors and tastes. Coffee extraction refers to the process of extracting the taste and aroma from coffee powder with water. Common extraction methods include: 1. Espresso: Use high pressure and hot water for rapid extraction, usually for 25-30 seconds, which requires very fine coffee powder. 2. Hand-brewed coffee: Use a drip cup and filter paper, hot water slowly drips through the coffee powder, the water flow rate and extraction time can be manually controlled, and the required coffee powder coarseness is usually medium. 3. Cold brew coffee: Use cold water or room temperature water to soak coffee powder for a long time, which usually does not involve a heating process, and the required coffee powder coarseness is medium to coarse. The coarseness of coffee powder can be measured by the particle size of the powder, and the amount of coffee powder can be calculated by the density of the powder and the volume of the powder. The coffee bean grinding system disclosed in the prior art uses manual or time control to control the amount of ground powder. However, due to the inconsistency of the coarseness of the powder, the weight of the powder will vary greatly, resulting in the extracted coffee being oil-free and flavorless. Summary of the invention

[0003] In order to overcome the technical problem that the existing grinding powder control system has a large variation in the powder weight, resulting in the extracted coffee being oil-free and flavorless, the present invention provides the following technical solution:

[0004] A grinding powder quantity control system comprises: a movable grinding wheel assembly, a fixed grinding wheel assembly arranged outside the movable grinding wheel assembly, and a base transmission box arranged under the fixed grinding wheel assembly;

[0005] The fixed grinding wheel assembly comprises an outermost fixed grinding wheel rotating shell, a fixed grinding wheel lifting shell arranged in the fixed grinding wheel rotating shell, and a fixed grinding wheel arranged in the fixed grinding wheel lifting shell;

[0006] The fixed grinding wheel lifting shell is connected to the fixed grinding wheel rotating shell by threads, and the fixed grinding wheel is clamped in the fixed grinding wheel lifting shell; the base transmission box includes a base body and a transmission box lower cover sealing the lower end of the base body;

[0007] The upper surface of the base body is provided with an outer cylindrical boss and an inner cylindrical boss, the fixed grinding wheel rotating shell is fixed on the outer cylindrical boss; the fixed grinding wheel lifting shell is fixed on the inner cylindrical boss;

[0008] A potentiometer is also provided on the upper surface of the base body, and the potentiometer is used to monitor the rotation angle of the fixed grinding wheel rotating shell, and then monitor the grinding wheel gap.

[0009] The movable grinding wheel assembly includes a movable grinding wheel and a movable grinding wheel shaft whose upper end is inserted into the movable grinding wheel; a base shaft hole is opened in the middle of the inner cylindrical boss, the lower end of the movable grinding wheel shaft is inserted into the base shaft hole and is connected to a power gear through a shaft sleeve, and a signal transmitter is arranged on the power gear; a signal receiver is fixed on the lower cover of the transmission box.

[0010] Furthermore, a lifting shell limit plate is vertically arranged on the lower end surface of the fixed grinding wheel lifting shell, and a lifting shell limit groove is formed between the inner wall of the outer cylindrical boss and the outer wall of the inner cylindrical boss through ribs, and the lifting shell limit plate is inserted into the lifting shell limit groove to realize the horizontal direction limitation of the fixed grinding wheel lifting shell.

[0011] Furthermore, the bottom surface of the fixed grinding wheel rotating shell is retracted inward to form an annular flange, and a plurality of stud grooves are arranged between the outer cylindrical boss and the inner cylindrical boss. The diameter of the annular flange is larger than the diameter of the circle where the stud grooves are located. The annular flange is placed on the upper edge of the outer cylindrical boss, and a fixing ring plate is installed on the annular flange by means of studs to tighten the studs, thereby achieving vertical fixation of the fixed grinding wheel rotating shell. A gear dial is installed on the upper end of the potentiometer, and a plurality of tooth-shaped protrusions are arranged on the outer wall of the lower end of the fixed grinding wheel rotating shell. The potentiometer meshes with the tooth-shaped protrusions through the gear dial to detect the rotation angle of the fixed grinding wheel rotating shell, and communicates with the MCU through the pins to monitor the grinding wheel gap.

[0012] Furthermore, the fixed grinding wheel includes a fixed grinding wheel cutter body and a fixed grinding wheel cutter holder, the outer wall of the fixed grinding wheel cutter body is tightly fitted and fixed with the inner wall of the fixed grinding wheel cutter holder; the inner wall of the fixed grinding wheel lifting shell is provided with a mounting protrusion, and a limiting column groove is provided in the mounting protrusion; the outer wall of the fixed grinding wheel cutter holder is provided with a closed groove and an open groove which are interconnected, and a limiting column is also provided in the closed groove.

[0013] Furthermore, the signal transmitting element is a magnet, and the signal receiving element is a Hall sensor.

[0014] A method for controlling the amount of grinding powder comprises the following steps:

[0015] S1- Monitoring of the change in the grinding wheel gap ΔD and the number of grinding wheel rotations H:

[0016] Mapping the physical signals of the grinding wheel gap change ΔD and the grinding wheel rotation number H into electrical signals, and determining the grinding wheel gap change ΔD and the grinding wheel rotation number H through the changes in the electrical signals;

[0017] S2- Determination of total weight M of powder:

[0018] Under different grinding wheel gap changes ΔD, the grinding wheel is rotated H times and the total weight M of the powder is measured;

[0019] S3-Relationship Fitting:

[0020] Fit the relationship between the change in grinding wheel gap ΔD, the total weight of powder M, and the number of grinding wheel rotations H;

[0021] S4-Target weight setting:

[0022] Set the required target weight M1 according to the target extraction method;

[0023] S6- Control of total powder weight M:

[0024] According to the relationship between the grinding wheel gap change ΔD, the total powder weight M and the grinding wheel rotation number H determined in step S3-relationship fitting, the grinding wheel rotation number H is controlled to make the powder output reach the target weight M1.

[0025] Furthermore, in the step of monitoring the grinding wheel gap change ΔD and the grinding wheel rotation number H;

[0026] A potentiometer is provided to monitor the grinding wheel gap of the grinding mechanism by monitoring the resistance change of the potentiometer;

[0027] A Hall sensor is provided to monitor the number of revolutions of the grinding mechanism by monitoring the magnetic field signal of the Hall element.

[0028] Furthermore, in the step of monitoring the grinding wheel gap change ΔD and the grinding wheel rotation number H;

[0029] A photoelectric sensor is provided to monitor the number of revolutions of the grinding mechanism by monitoring the number of occurrences of the pulse signal;

[0030] An encoder is set to monitor the grinding wheel gap of the grinding mechanism by monitoring the binary signal fed back by the encoder.

[0031] Furthermore, in the step S3-relationship fitting, the gear position D is used to replace the grinding wheel gap change ΔD, and the following relationship between the number of rotations N, the total weight of the powder M and the gear position D is fitted by the PID algorithm: H=M / (0.3+D / 300).

[0032] Furthermore, in the control of the total gram weight M of the powder in step S6, the relationship determined in step S3-relationship fitting is sent to the MCU for calculation, and the number of revolutions H of the grinding wheel is controlled by the calculation result, thereby controlling the powder to reach the target gram weight M1.

[0033] The present invention maps physical quantities such as the change in grinding wheel gap and the number of grinding wheel rotations related to the total gram weight of powder into electrical signals, calculates the mapped electrical signals through MCU, and controls the total gram weight of powder from two aspects of particle size and total amount, thereby accurately controlling the total amount of ground powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is an overall three-dimensional schematic diagram of the grinding powder quantity control system in the present invention.

[0035] Figure 2 It is an overall explosion diagram of the grinding powder quantity control system in the present invention.

[0036] Figure 3 It is an isometric schematic diagram of the bottom surface of the base transmission box of the grinding powder quantity control system in the present invention.

[0037] Figure 4 The figure is a schematic diagram of the assembly of the fixed grinding wheel assembly and the base transmission box of the grinding powder quantity control system in the present invention.

[0038] Figure 5 The figure is a schematic diagram of the assembly of the fixed grinding wheel assembly of the grinding powder quantity control system of the present invention.

[0039] Figure 6 The figure is a schematic diagram of the overall assembly of the coffee machine with powder quantity control in the present invention.

[0040] Figure 7 It is a schematic isometric view of the bottom surface of the coffee machine with powder quantity control in the present invention.

[0041] Figure 8 The figure is a circuit diagram of the Hall element and the potentiometer in the present invention.

[0042] Fig. 9 It is a schematic diagram of the grinding wheel gap in the present invention.

[0043] In the figure:

[0044] Fixed grinding wheel assembly 1, movable grinding wheel assembly 2, base transmission box 3;

[0045] Fixed grinding wheel rotating shell 11, fixed grinding wheel lifting shell 12, fixed grinding wheel 13, tooth-shaped protrusion 111

[0046] A movable grinding wheel 21, a movable grinding wheel shaft 22, and a powder sweeping impeller 23;

[0047] Base body 31, transmission box lower cover 32, power source 33, powder outlet channel 34, power gear 35;

[0048] An outer cylindrical boss 311, an inner cylindrical boss 312, a potentiometer 313, a gear dial 313a, and a base shaft hole 314;

[0049] Anion probe 341, sleeve 351, signal transmitter 352, signal receiver 353;

[0050] The lifting shell limiting plate 121, the lifting shell limiting groove 315, the annular flange 112, the stud groove 316, and the fixing ring plate 317;

[0051] Thread line 122, fixed grinding wheel cutter body 131, fixed grinding wheel cutter holder 132;

[0052] The mounting protrusion 123, the limiting column groove 123a, the closed groove 132b, the open groove 132c, and the limiting column 132a. DETAILED DESCRIPTION

[0053] The technical solution of the present invention is described clearly and completely with specific embodiments in conjunction with the accompanying drawings. It should be understood that the described embodiments are only used to illustrate the present invention, but not to limit the scope of the present invention.

[0054] Embodiment 1:

[0055] The present invention provides a grinding powder quantity control system, according to Figure 1 As shown, it comprises: a movable grinding wheel assembly 2, a fixed grinding wheel assembly 1 arranged outside the movable grinding wheel assembly 2, and a base transmission box 3 arranged under the fixed grinding wheel assembly 1;

[0056] Combination Figure 1 and Figure 2 The fixed grinding wheel assembly 1 comprises an outermost fixed grinding wheel rotating shell 11, a fixed grinding wheel lifting shell 12 disposed in the fixed grinding wheel rotating shell 11, and a fixed grinding wheel 13 disposed in the fixed grinding wheel lifting shell 12;

[0057] The fixed grinding wheel lifting shell 12 is connected to the fixed grinding wheel rotating shell 11 by threads, and the fixed grinding wheel 13 is clamped in the fixed grinding wheel lifting shell 12; by rotating the fixed grinding wheel rotating shell 11, the fixed grinding wheel lifting shell 12 can drive the fixed grinding wheel 13 to move up and down;

[0058] It should be noted that the fixed grinding wheel lifting shell 12 and the fixed grinding wheel rotating shell 11 can be lifted and lowered by a complete thread line, a segmented thread line, an inclined block connection or the like.

[0059] The base transmission box 3 includes a base body 31, a transmission box lower cover 32 sealing the lower end of the base body 31, a power source 33 providing power, and a powder outlet channel 34 for powder to leave;

[0060] The upper surface of the base body 31 is provided with an outer cylindrical boss 311 and an inner cylindrical boss 312, the fixed grinding wheel rotating shell 11 is fixed on the outer cylindrical boss 311; the fixed grinding wheel lifting shell 12 is fixed on the inner cylindrical boss 312;

[0061] A potentiometer 313 is also provided on the upper surface of the base body 31, and the potentiometer 313 is used to monitor the rotation angle of the fixed grinding wheel rotating shell 11, and then monitor the grinding wheel gap;

[0062] Combination Figure 2 and Figure 3 The movable grinding wheel assembly 2 includes a movable grinding wheel 21 and a movable grinding wheel shaft 22 whose upper end is inserted into the movable grinding wheel 21; a base shaft hole 314 is opened in the middle of the inner cylindrical boss 312, and the lower end of the movable grinding wheel shaft 22 is inserted into the base shaft hole 314 and connected to a power gear 35 through a shaft sleeve 351.

[0063] The power gear 35 is provided with a signal transmitter 352; the transmission box lower cover 32 is fixed with a signal receiver 353; the signal receiver 353 communicates with an external MCU (not shown) through a pin to calculate the number of revolutions of the moving grinding wheel 21; the arrangement of the signal transmitter 352 and the signal receiver 353 can adopt a sensor arrangement known in the prior art, which is not limited here;

[0064] The rotation of the fixed grinding wheel rotating shell 11 will cause the resistance value of the potentiometer 33 to change. Different rotation angles correspond to different lifting heights of the fixed grinding wheel 13. The potentiometer 33 communicates with the MCU, and calculates the lifting height of the fixed grinding wheel lifting shell 11 through the change of its resistance value, thereby calculating the gap between the movable grinding wheel 13 and the fixed grinding wheel 21, and obtaining the particle size of the powder output;

[0065] Preferably, the fixed grinding wheel rotating shell 11 rotates clockwise to reduce the grinding wheel gap, and rotates counterclockwise to reduce the grinding wheel gap.

[0066] The signal receiving element 352 receives the signal from the signal transmitting element 351, calculates the number of rotations of the power gear 35, and obtains the amount of powder output from the number of rotations of the driven grinding wheel 21; and accurately calculates the weight of the powder output in combination with the particle size of the powder output and the amount of the powder output.

[0067] Furthermore, a gear dial 313a is installed on the upper end of the potentiometer, and a plurality of tooth-shaped protrusions 111 are arranged around the outer wall of the lower end of the fixed grinding wheel rotating shell 11. The potentiometer 313 engages with the tooth-shaped protrusions 111 through the gear dial 313a to detect the rotation angle of the fixed grinding wheel rotating shell 11, and communicates with the MCU through the pin (not shown in the figure), thereby monitoring the grinding wheel gap.

[0068] Further, according to Figure 4As shown, a lifting shell limiting plate 121 is vertically arranged on the lower end surface of the fixed grinding wheel lifting shell 12, and a lifting shell limiting groove 315 is formed between the inner wall of the outer cylindrical boss 311 and the outer wall of the inner cylindrical boss 312 through ribs, and the lifting shell limiting plate 121 is inserted into the lifting shell limiting groove 315 to realize the horizontal direction limitation of the fixed grinding wheel lifting shell 12.

[0069] Furthermore, the bottom surface of the fixed grinding wheel rotating shell 11 is inwardly retracted to form an annular flange 112, and a plurality of stud grooves 316 are arranged between the outer cylindrical boss 311 and the inner cylindrical boss 312. The diameter of the annular flange 112 is larger than the diameter of the circle where the stud grooves 316 are located. The annular flange 112 is placed on the upper edge of the outer cylindrical boss 311, and a fixed ring plate 317 is installed on the annular flange 112 by means of stud pressing, thereby realizing the vertical direction restriction of the fixed grinding wheel rotating shell 11.

[0070] Furthermore, the outer wall of the fixed grinding wheel lifting shell 12 is provided with a plurality of thread lines 122, and the inner wall of the fixed grinding wheel rotating shell 11 is provided with threads, and the two are connected by threads.

[0071] Further, according to Figure 5 As shown, the fixed grinding wheel 13 includes a fixed grinding wheel cutter body 131 and a fixed grinding wheel cutter holder 132, the outer wall of the fixed grinding wheel cutter body 131 is tightly matched and fixed with the inner wall of the fixed grinding wheel cutter holder 132; the inner wall of the fixed grinding wheel lifting shell 12 is provided with a mounting protrusion 123, and a limiting column groove 123a is provided in the mounting protrusion 123; the outer wall of the fixed grinding wheel cutter holder 132 is provided with a closed groove 132b and an open groove 132c that are connected to each other;

[0072] A limiting column 132a is provided in the closed groove 132b; after the open groove 132c is aligned with the mounting protrusion 123, the fixed grinding wheel tool holder 132 is placed in the fixed grinding wheel lifting shell 12, and then rotated to screw the mounting protrusion 123 into the closed groove 132b and allow the limiting column 132a to be clamped in the limiting groove 123a, so that the fixed grinding wheel 13 is fixedly connected to the fixed grinding wheel lifting shell 12.

[0073] Further, back to Figure 2 The powder outlet channel 34 is also provided with an anion probe 341 , and the anion probe 341 extends into the powder outlet channel 34 to remove static electricity between powders.

[0074] Furthermore, the movable grinding wheel assembly 2 also includes a powder sweeping impeller 23. The arrangement of the powder sweeping impeller is known in the prior art and will not be described in detail.

[0075] Further, back to Figure 3The signal transmitting element 352 is a magnet, and the signal receiving element 353 is a Hall sensor. When the magnetic field of the magnet acts on the Hall element, the Hall voltage will change according to the strength and direction of the magnetic field. By measuring this voltage, the number of revolutions of the power gear 35 can be known, and then the powder output can be obtained.

[0076] Furthermore, the power gear 35 is driven by the power source 33 through a transmission mechanism. The power source 33 and the transmission mechanism may be power devices known in the prior art, such as a motor and a worm gear, which are not limited here.

[0077] Embodiment 2:

[0078] A coffee machine with powder quantity control, according to Figure 6 As shown, it comprises: a bean box 4, a coarseness and fineness adjustment device 5 arranged under the bean box 4, and a grinding powder amount control system 6 arranged under the coarseness and fineness adjustment device 5;

[0079] The coarseness and fineness adjustment device 5 comprises: a coarseness and fineness limiting plate 51 clamped on the grinding powder quantity control system 6, and an adjustment dial 52 arranged on the coarseness and fineness limiting plate 51;

[0080] Furthermore, the uppermost end of the grinding powder control system 6 is a fixed grinding wheel rotating shell 11, and a rotating shell limiting groove 113 is provided on the fixed grinding wheel rotating shell 11. A coarse and fine limiting plate 511 is provided on the lower end surface of the coarse and fine limiting disk 51. The coarse and fine limiting plate 511 is inserted into the rotating shell limiting groove 113, so that the coarse and fine limiting disk 51 can drive the fixed grinding wheel rotating shell 11 to rotate together;

[0081] The outer wall of the coarse and fine limit disk 51 is provided with a plurality of adjusting dial fixing grooves 512, and the inner wall of the adjusting dial 52 is provided with a plurality of adjusting dial fixing columns 521 corresponding to the adjusting dial fixing grooves 512. The adjusting dial fixing columns 521 are clamped in the adjusting dial fixing grooves 512, so that the adjusting dial 52 can drive the coarse and fine limit disk 51 and the fixed grinding wheel rotating shell 11 to rotate together.

[0082] Furthermore, the outer wall of the adjustment dial 52 may be provided with a plurality of scale lines (not shown in the figure), corresponding to different grinding coarsenesses, to facilitate quantitative adjustment by the user. The scale line setting method is already disclosed in the prior art and will not be described in detail.

[0083] Embodiment 3:

[0084] A method for controlling the amount of grinding powder comprises the following steps:

[0085] S1- Monitoring of the change in the grinding wheel gap ΔD and the number of grinding wheel rotations H:

[0086] Mapping the physical signals of the grinding wheel gap change ΔD and the grinding wheel rotation number H into electrical signals, and determining the grinding wheel gap change ΔD and the grinding wheel rotation number H through the changes in the electrical signals;

[0087] S2- Determination of total weight M of powder:

[0088] Under different grinding wheel gap changes ΔD, the grinding wheel is rotated H times and the total weight M of the powder is measured;

[0089] S3-Relationship Fitting:

[0090] Fit the relationship between the change in grinding wheel gap ΔD, the total weight of powder M, and the number of grinding wheel rotations H;

[0091] S4-Target weight setting:

[0092] Set the required target weight M1 according to the target extraction method;

[0093] S6- Control of total powder weight M:

[0094] According to the relationship between the grinding wheel gap change ΔD, the total powder weight M and the grinding wheel rotation number H determined in step S3-relationship fitting, the grinding wheel rotation number H is controlled to make the powder output reach the target weight M1.

[0095] Furthermore, in the step of monitoring the grinding wheel gap change ΔD and the grinding wheel rotation number H;

[0096] A gear dial potentiometer is set to monitor the grinding wheel gap of the grinding mechanism by monitoring the resistance change of the gear dial potentiometer;

[0097] A Hall sensor is provided to monitor the number of revolutions of the grinding mechanism by monitoring the magnetic field signal of the Hall element;

[0098] Preferably, a photoelectric sensor is provided to monitor the number of revolutions of the grinding mechanism by monitoring the number of occurrences of the pulse signal;

[0099] Preferably, an encoder is provided to replace the gear dial potentiometer to monitor the grinding wheel gap of the grinding mechanism;

[0100] Preferably, a Hall sensor is provided to monitor the grinding wheel gap of the grinding mechanism by monitoring the magnetic field magnitude signal of the Hall element;

[0101] Furthermore, in the step S3-relationship fitting, the gear position D is used to replace the grinding wheel gap change ΔD, and the following relationship between the number of rotations H, the total weight of the powder M and the gear position D is fitted by the PID algorithm:

[0102] H=M / (0.3+D / 300)

[0103] The gear position D represents the coarse and fine gear position corresponding to the grinding wheel gap in the grinding system, and its value range is [0-30];

[0104] Furthermore, in the control of the total gram weight M1 of the powder in step S6, the relationship determined in step S3-relationship fitting is sent to the MCU for calculation, and the number of revolutions H of the grinding wheel is controlled by the calculation result, thereby controlling the powder to reach the target gram weight M1.

[0105] The circuit principle of monitoring the number of rotations of the grinding mechanism by the Hall element in the present invention is as follows: Figure 8 As shown in Figure A, the Hall plate detects the magnetic field signal on the power gear magnet and processes the signal through resistors and capacitors. It then communicates with the MCU to calculate the number of revolutions of the grinding wheel.

[0106] The circuit principle of the present invention for monitoring the grinding wheel gap of the grinding mechanism through the potentiometer is as follows: Figure 8 As shown in Figure B, the rotation of the fixed grinding wheel rotating shell causes the resistance of the potentiometer to change, and the signal is processed through the resistor and capacitor, and then communicated with the MCU to calculate the grinding wheel gap.

[0107] The grinding wheel gap referred to in the present invention is as follows: Fig. 9 As shown, it refers to the grinding wheel gap d between the fixed grinding wheel cutter body 131 and the fixed and movable grinding wheel 21 at the nearest end.

[0108] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are within the scope of the technical solution of the present invention.

Claims

1. A grinding powder quantity control system, characterized in that: include: A movable grinding wheel assembly, a fixed grinding wheel assembly arranged outside the movable grinding wheel assembly, and a base transmission box arranged under the fixed grinding wheel assembly; The fixed grinding wheel assembly comprises an outermost fixed grinding wheel rotating shell, a fixed grinding wheel lifting shell arranged in the fixed grinding wheel rotating shell, and a fixed grinding wheel arranged in the fixed grinding wheel lifting shell; The fixed grinding wheel lifting shell is connected to the fixed grinding wheel rotating shell by threads, and the fixed grinding wheel is clamped in the fixed grinding wheel lifting shell; the base transmission box includes a base body and a transmission box lower cover sealing the lower end of the base body; The upper surface of the base body is provided with an outer cylindrical boss and an inner cylindrical boss, the fixed grinding wheel rotating shell is fixed on the outer cylindrical boss; the fixed grinding wheel lifting shell is fixed on the inner cylindrical boss; A potentiometer is also provided on the upper surface of the base body, and the potentiometer is used to monitor the rotation angle of the fixed grinding wheel rotating shell, and then monitor the grinding wheel gap. The movable grinding wheel assembly includes a movable grinding wheel and a movable grinding wheel shaft whose upper end is inserted into the movable grinding wheel; a base shaft hole is opened in the middle of the inner cylindrical boss, the lower end of the movable grinding wheel shaft is inserted into the base shaft hole and is connected to a power gear through a shaft sleeve, and a signal transmitter is arranged on the power gear; a signal receiver is fixed on the lower cover of the transmission box.

2. The grinding powder quantity control system according to claim 1, characterized in that: A lifting shell limit plate is vertically arranged on the lower end surface of the fixed grinding wheel lifting shell, and a lifting shell limit groove is formed between the inner wall of the outer cylindrical boss and the outer wall of the inner cylindrical boss through ribs, and the lifting shell limit plate is inserted into the lifting shell limit groove to realize the horizontal direction limitation of the fixed grinding wheel lifting shell.

3. The grinding powder quantity control system according to claim 2, characterized in that: The bottom surface of the fixed grinding wheel rotating shell is retracted inward to form an annular flange, and a plurality of stud grooves are arranged between the outer cylindrical boss and the inner cylindrical boss. The diameter of the annular flange is larger than the diameter of the circle where the stud grooves are located. The annular flange is placed on the upper edge of the outer cylindrical boss, and a fixed ring plate is installed on the annular flange by means of stud pressing, so as to realize the vertical direction restriction of the fixed grinding wheel rotating shell. A gear dial is installed on the upper end of the potentiometer, and a plurality of tooth-shaped protrusions are arranged on the outer wall of the lower end of the fixed grinding wheel rotating shell. The potentiometer meshes with the tooth-shaped protrusions through the gear dial, detects the rotation angle of the fixed grinding wheel rotating shell, and communicates with the MCU through the pins, so as to monitor the grinding wheel gap.

4. The grinding powder quantity control system according to claim 1, characterized in that: The fixed grinding wheel comprises a fixed grinding wheel cutter body and a fixed grinding wheel cutter holder, wherein the outer wall of the fixed grinding wheel cutter body is tightly matched and fixed with the inner wall of the fixed grinding wheel cutter holder; the inner wall of the fixed grinding wheel lifting shell is provided with a mounting protrusion, and a limiting column groove is provided in the mounting protrusion; the outer wall of the fixed grinding wheel cutter holder is provided with a closed groove and an open groove which are interconnected, and a limiting column is also provided in the closed groove.

5. The grinding powder quantity control system according to claim 1, characterized in that: The signal transmitting element is a magnet, and the signal receiving element is a Hall sensor.

6. A method for controlling the amount of grinding powder, characterized in that: The steps include: S1- Monitoring of the change in the grinding wheel gap ΔD and the number of grinding wheel rotations H: Mapping the physical signals of the grinding wheel gap change ΔD and the grinding wheel rotation number H into electrical signals, and determining the grinding wheel gap change ΔD and the grinding wheel rotation number H through the changes in the electrical signals; S2- Determination of total weight M of powder: Under different grinding wheel gap changes ΔD, the grinding wheel is rotated H times and the total weight M of the powder is measured; S3-Relationship Fitting: Fit the relationship between the grinding wheel gap change ΔD, the total weight of the powder M, and the number of grinding wheel rotations H; S4-Target weight setting: Set the required target weight M1 according to the target extraction method; S6- Control of total powder weight M: According to the relationship between the grinding wheel gap change ΔD, the total powder weight M and the grinding wheel rotation number H determined in step S3-relationship fitting, the grinding wheel rotation number H is controlled to make the powder output reach the target weight M1.

7. The grinding powder amount control method according to claim 6, characterized in that: In the step of monitoring the grinding wheel gap change ΔD and the grinding wheel rotation number H; A potentiometer is provided to monitor the grinding wheel gap of the grinding mechanism by monitoring the resistance change of the potentiometer; A Hall sensor is provided to monitor the number of revolutions of the grinding mechanism by monitoring the magnetic field signal of the Hall element.

8. The method for controlling the amount of grinding powder according to claim 6, characterized in that: In the step of monitoring the grinding wheel gap change ΔD and the grinding wheel rotation number H; A photoelectric sensor is provided to monitor the number of revolutions of the grinding mechanism by monitoring the number of occurrences of the pulse signal; An encoder is set to monitor the grinding wheel gap of the grinding mechanism by monitoring the binary signal fed back by the encoder.

9. The grinding powder amount control method according to claim 6, characterized in that: In the step S3-relationship fitting, the gear position D is used to replace the grinding wheel gap change ΔD, and the following relationship between the number of rotations H, the total weight of powder M and the gear position D is fitted by the PID algorithm: H=M / (0.3+D / 300).

10. The method for controlling the amount of grinding powder according to claim 6, characterized in that: In the control of the total gram weight M of the powder in step S6, the relationship determined in step S3-relationship fitting is sent to the MCU for calculation, and the number of revolutions H of the grinding wheel is controlled by the calculation result, thereby controlling the powder to reach the target gram weight M1.

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