Variable frequency electric stone mill tea automatic production line and control method

Abstract

The present application relates to the technical field of tea processing, and specifically relates to a variable-frequency electric stone mill matcha automatic production line and a control method, which comprises a feeding unit for providing matcha raw materials, a primary distribution unit arranged at the discharging end of the feeding unit, a secondary distribution unit arranged at the discharging end of the primary distribution unit, and the primary distribution unit distributing the matcha raw materials to the secondary distribution unit according to primary distribution conditions; the discharging end of the secondary distribution unit is connected with each single stone mill device in a stone mill grinding unit, and the secondary distribution unit distributes the matcha raw materials to each single stone mill device according to secondary distribution conditions; and the discharging end of each single stone mill device is in communication with a collecting unit; through the cooperation between the feeding unit, the distribution unit, the stone mill grinding unit and the conveying unit, the present application can realize continuous feeding and grinding of matcha, reduce the downtime of the grinding unit during feeding, and improve the production efficiency of matcha.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tea processing, in particular to a variable frequency electric stone mill matcha automatic production line and a control method. BACKGROUND

[0002] Currently, the stone mill matcha on the market is mostly produced by electric stone mill single machines, and each group of electric stone mill single machines adopts an independent feeding system in the production process, and the systems do not interfere with each other.

[0003] The existing matcha grinding devices are various, but in the long-term use process, the following technical problems also exist:

[0004] 1. Each system adopts manual loading and unloading in the feeding and discharging process after grinding, which results in low production efficiency and high labor intensity, and cannot realize automatic batching, feeding and discharging, thereby causing many production gaps in the whole production process, resulting in discontinuous production and inability to form continuous production.

[0005] 2. The electric stone mill single machine usually arranges the grinding motor below the stone mill disc, and adopts the mode of driving the lower stone mill disc to rotate by the grinding motor to grind matcha. However, in the grinding process, the tea powder of matcha is dispersed around the grinding motor, and at this time, the grinding motor working under power is easy to electrify the surrounding tea powder, thereby easily causing the explosion of the tea powder. Even if no explosion occurs, the tea powder dispersed in the air will also pollute the environment of the production workshop, and the workers in the workshop will also be adversely affected after inhaling a large amount of tea powder.

[0006] 3. In the grinding process of the electric stone mill single machine, since the upper and lower stone mill discs rotate to rub each other to realize the grinding of matcha, a large amount of heat is generated at the grinding position, which causes the temperature of the grinding cavity of the upper and lower stone mill discs to rise; the matcha is easily affected by the high grinding temperature, and the tea color becomes dark and the taste becomes worse, which seriously affects the quality of the tea powder.

[0007] In the face of the above technical problems, effective solutions are urgently needed. SUMMARY

[0008] In order to avoid and overcome the technical problems existing in the prior art, the present application provides a variable frequency electric stone mill matcha automatic production line and a control method. The present application can realize continuous feeding and grinding of matcha, effectively reduce the labor intensity of workers; at the same time, it can also reduce the downtime of the grinding part during feeding, which is beneficial to improve the production efficiency of matcha. The control method adopted by the present application can realize precise control of the production line production, thereby effectively improving the processing efficiency of matcha.

[0009] To achieve the above object, the present application provides the following technical solutions:

[0010] A variable frequency electric stone mill matcha automatic production line, including providing matcha raw material feeding unit, the discharge end of the feeding unit is arranged with primary distribution unit, the discharge end of the primary distribution unit is arranged with secondary distribution unit, and the primary distribution unit distributes matcha raw material to the secondary distribution unit according to the primary distribution condition;The discharge end of the secondary distribution unit is connected with each single stone mill device in the stone mill grinding machine group, and the secondary distribution unit distributes matcha raw material to each single stone mill device according to the secondary distribution condition, and the discharge end of each single stone mill device is communicated with the collecting unit to collect the tea powder after grinding.

[0011] As a further scheme of the present application: the single stone mill device includes a variable frequency motor support and a matcha collection disc fixedly installed on the variable frequency motor support, a lower movable mill is coaxially installed on the matcha collection disc, and a variable frequency motor is installed on the variable frequency motor support to drive the lower movable mill to rotate;The upper fixed mill is coaxially arranged on the lower movable mill and fixedly arranged on the lower movable mill, and the surface of the lower movable mill and the upper fixed mill contacting each other forms a grinding cavity;The upper fixed mill is provided with an inlet hole extending into the grinding cavity from top to bottom, and the inlet end of the inlet hole is communicated with a stone mill feeding hopper, which is coaxially fixed on the upper fixed mill, and the stone mill feeding hopper and the discharge end of the secondary distribution unit are communicated with each other.

[0012] As a further scheme of the present application: the upper disc surface of the matcha collection disc is coaxially recessed with a recess, the lower movable mill is arranged in the recess, and the lower movable mill and the matcha collection disc are rotatably connected by a lower stone mill support bearing;The outer wall surface of the lower movable mill and the side wall of the recess form an annular temporary storage cavity for storing tea powder, and a collection hole for leaking material is formed through the matcha collection disc at the bottom of the temporary storage cavity;A brush is installed on the lower movable mill and can rotate synchronously with the lower movable mill, and the brush makes one-way circular motion in the temporary storage cavity to sweep the tea powder into the collection hole.

[0013] As a further scheme of the present application: the surface of the upper fixed mill and the lower movable mill contacting each other is arranged with grinding lines, the grinding lines include more than six fan-shaped grinding line areas, each fan-shaped grinding line area is uniformly distributed around the center of the contact surface, and the center of each fan-shaped grinding line area is located on the edge of the contact surface;One side of each fan-shaped grinding line area coincides with the edge of the contact surface, and the other side coincides with the arc line of the adjacent fan-shaped grinding line area.

[0014] As a further scheme of the present application: the secondary distribution unit comprises two or more groups of structurally identical distribution parts, the distribution part comprises a three-way valve type left zone first distribution mechanism, the left zone first distribution mechanism comprises a distribution mechanism shell with three mutually communicating material ports and a "human" shaped structure, each material port is respectively an inlet port, a first outlet port and a second outlet port, a distribution plate is hinged at the intersection of the first outlet port and the second outlet port and can swing back and forth to make the inlet port communicate with the first outlet port or the second outlet port, the first outlet port is communicated with a left zone first primary branch pipe, and the second outlet port is communicated with a left zone second primary branch pipe;

[0015] The inlet port is communicated with the bottom of the distribution left zone inlet hopper arranged at the discharge end of the primary distribution unit, and the distribution left zone inlet hopper is fixed on the support frame;

[0016] The bottom of the left zone first primary branch pipe and the left zone second primary branch pipe is communicated with the distribution part, and the branch pipe in the distribution part is communicated with the corresponding stone mill inlet hopper.

[0017] As a further scheme of the present application: an electric push rod support seat is fixedly installed on the outside of the distribution mechanism shell, the electric push rod comprises an electric push rod shell and an electric push rod shaft, one end of the electric push rod shell is hinged with the electric push rod support seat, and the driving end of the electric push rod shaft is hinged with the rocker; the other end of the rocker is hinged with the distribution mechanism shell. The distribution rotating shaft fixedly connected with the distribution plate penetrates through the distribution mechanism shell and is fixedly connected with the rocker to form an L-shaped structure, and the distribution plate can swing under the driving of the rocker; the hinged axis at the electric push rod support seat, the axis of the distribution rotating shaft and the hinged axis at the driving end of the electric push rod shaft are parallel to each other and do not coincide with each other.

[0018] As a further scheme of the present application: the feeding unit comprises a vertical conveyor; the primary distribution unit comprises a distribution conveyor support frame installed on the top of the frame, a distribution conveyor is installed on the distribution conveyor support frame, and the distribution conveyor is arranged below the material falling track of the vertical conveyor; the distribution left zone inlet hopper and the distribution right zone inlet hopper are respectively located below the material falling track of the corresponding end of the distribution conveyor.

[0019] As a further scheme of the present application: the collection unit comprises an auger collection device, the auger collection device comprises an auger shell installed on an auger frame, an okonomiyaki material falling pipe is arranged on the auger shell and communicated with a lumen, the top end of the okonomiyaki material falling pipe is communicated with a collection hole on the corresponding okonomiyaki collection disc; an auger blade is coaxially and rotationally arranged in the lumen of the auger shell, the auger blade is fixedly connected with an auger main shaft through a flange, and the auger main shaft is connected with an auger motor shaft through a coupling; the auger motor is fixed on one end of the auger shell through a flange. The other end of the auger shell is an outlet end.

[0020] As a further scheme of the present application: the production line further comprises a stone mill dust cover lower support plate fixedly installed at the bottom of the matcha collecting disc, a stone mill dust cover is fixedly connected to the stone mill dust cover lower support plate and covers the outside of the single stone mill device; the stone mill dust cover comprises a stone mill dust cover rack, transparent glass is installed on the side of the stone mill dust cover rack, a first transparent glass plate is installed on the top of the stone mill dust cover rack, and a square hole is formed in the first transparent glass plate and communicates with the bottom end of the corresponding material feeding pipe, so that the matcha raw materials can smoothly fall into the stone mill hopper;

[0021] The top of the upper fixed mill is concave and provided with a refrigeration cavity, a refrigeration device is installed in the refrigeration cavity, a small hole is formed in the gap between adjacent grinding lines of the upper fixed mill, a temperature sensor for detecting the temperature of the grinding cavity is installed in the small hole, and an upper fixed mill end cover is covered on the cavity opening of the refrigeration cavity;

[0022] The upper fixed mill end cover is provided with a hopper first photoelectric switch and a hopper first photoelectric switch reflection plate used in cooperation with the hopper first photoelectric switch, and two transparent holes for light to pass through are sequentially formed in the bottom of the stone mill hopper along the propagation direction of the light of the hopper first photoelectric switch;

[0023] An annular support is arranged on the outside of the stone mill hopper support, a hopper second photoelectric switch and a hopper second photoelectric switch reflection plate used in cooperation with the hopper second photoelectric switch are arranged on the annular support, two transparent holes for light to pass through are sequentially formed in the top of the stone mill hopper along the propagation direction of the light of the hopper second photoelectric switch, and the propagation path of the light of the second photoelectric switch and the material falling track of the material feeding pipe avoid each other;

[0024] The production line further comprises a control module for receiving the signals emitted by the hopper first photoelectric switch and the hopper second photoelectric switch, the control module outputs corresponding primary and secondary material distribution conditions, and then controls the corresponding units to make corresponding actions.

[0025] A control method for variable frequency electric stone mill matcha automatic production, which is suitable for a variable frequency electric stone mill matcha automatic production line, the control method comprises the following steps:

[0026] S1: the control module controls the operation of each variable frequency motor and auger motor; when a hopper first photoelectric switch detects that the amount of matcha raw materials in the corresponding stone mill hopper is lower than the lower limit value, the hopper first photoelectric switch sends a signal to the control module, and after the control module receives the signal emitted by the hopper first photoelectric switch (3027), the control module controls the corresponding variable frequency motor (3018) to stop rotating;

[0027] S2: the control module controls the corresponding electric push rod shaft in the secondary material distribution unit to move to connect the pipeline between the corresponding feed hopper and the stone mill upper feed hopper; the control module controls the vertical conveyor motor inside the vertical conveyor to run to convey the matcha raw material on the conveying belt of the vertical conveyor to the material distribution conveyor; the control module controls the material distribution conveyor to convey the matcha raw material on the conveying belt of the material distribution conveyor into the corresponding feed hopper;

[0028] S3: when the corresponding second photoelectric switch detects that the amount of matcha raw material in the corresponding stone mill upper feed hopper is higher than the upper limit value, the control module controls the corresponding variable frequency motor to resume rotation; the vertical conveyor and the material distribution conveyor stop distributing material, and the corresponding electric push rod shaft is reset;

[0029] S4: the control module controls the auger motor to collect the ground matcha powder.

[0030] Compared with the prior art, the beneficial effects of the present application are:

[0031] 1. The material distribution unit automatically distributes and supplies the external matcha raw material to each single stone mill device, multiple single stone mill devices work simultaneously, which can effectively improve the working efficiency, reduce the participation of manual labor, and reduce the labor intensity of workers. The feeding unit, the material distribution unit, the conveying unit and the stone mill grinding machine group can realize intelligent automatic feeding, distribution, grinding and discharge through specific program control, so that each single stone mill device realizes automatic and continuous work, and compared with the manual feeding mode, the machine downtime can be greatly shortened, thereby improving the production efficiency of matcha.

[0032] 2. The traditional stone mill is used to grind tea leaves, so that the taste and quality of tea powder are guaranteed. The upper stationary mill and the lower movable mill cooperate with each other to fully grind the matcha raw material. The brush is arranged to facilitate the cleaning of tea powder into the matcha collection tray, so that the collection of tea powder is realized.

[0033] 3. The material distribution mechanism and the control module cooperate with each other to realize accurate material distribution. The material distribution plate is hingedly installed in the material distribution mechanism housing, so that the feeding port and the first discharge port or the second discharge port are connected to each other according to the actual demand, and the accurate distribution of matcha raw material is realized.

[0034] 4. The photoelectric switch in the present application can realize real-time detection of the amount of matcha raw material in the stone mill upper feed hopper, so that the feeding unit and the material distribution unit can timely add matcha raw material to the stone mill upper feed hopper without causing the matcha raw material in the stone mill upper feed hopper to overflow due to excessive feeding, and the matcha raw material in each stone mill upper feed hopper is ensured to be sufficient.

[0035] 5、The grinding lines in the application can greatly improve the quality of tea powder, and the uniformly distributed fan-shaped grinding line area can repeatedly grind the matcha, which is beneficial to make the tea powder finer. The feed hole is beneficial to the flow of matcha raw materials to the grinding lines, improving the grinding efficiency.

[0036] 6、The refrigeration device in the application can effectively cool the grinding cavity. In the grinding process, the heat rises from bottom to top to the upper fixed grinder, and at this time, the refrigeration device is arranged in the upper fixed grinder, which can effectively reduce the temperature of the upper fixed grinder, and then cool the grinding cavity, effectively avoid the temperature of the grinding cavity being too high, which is beneficial to improve the quality of tea powder, and the installation is convenient.

[0037] 7、The stone mill dust cover in the application can effectively reduce the dispersion of tea powder after grinding, which is beneficial to improve the air quality of the production workshop and eliminate the safety hidden danger of dust explosion. The cover body of the stone mill dust cover is supported by transparent glass, which is convenient for observing the grinding process of the single stone mill device inside. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 The overall structure diagram of the application.

[0039] Figure 2 The structure diagram of the primary material distribution unit of the application.

[0040] Figure 3 The structure diagram of the secondary material distribution unit of the application.

[0041] Figure 4 The structure diagram of the stone mill grinding machine group and the collection unit of the application.

[0042] Figure 5 The structure diagram of the single stone mill device of the application.

[0043] Figure 6 The structure diagram of the stone mill dust cover arranged on the single stone mill device of the application.

[0044] Figure 7 The sectional view of the single stone mill device of the application.

[0045] Figure 8 The structure diagram of the grinding lines of the upper fixed grinder and the lower movable grinder of the application.

[0046] Figure 9 The structure diagram of the material distribution mechanism when the material distribution plate is located at the left rest point of the application.

[0047] Figure 10 The structure diagram of the material distribution mechanism when the material distribution plate is located at the right rest point of the application.

[0048] Figure 11 The structure diagram of the stone mill dust cover of the application.

[0049] Figure 12 Structure diagram of the collecting unit of the present application.

[0050] In the figure:

[0051] 1, primary distribution unit: 101, distribution conveyor deceleration motor; 102, distribution conveyor driving shaft; 103, distribution conveyor driven shaft; 104, distribution conveyor motor support; 105, distribution conveyor belt; 106, distribution conveyor rack; 107, distribution conveyor support frame;

[0052] 2, secondary distribution unit: 201, left zone distribution hopper; 202, right zone distribution hopper; 203, left zone first distribution mechanism; 204, left zone second distribution mechanism; 205, left zone third distribution mechanism; 206, right zone first distribution mechanism; 207, right zone second distribution mechanism; 208, right zone third distribution mechanism; 209, left zone total material pipe; 210, right zone total material pipe; 211, left zone first primary branch pipe; 212, left zone second primary branch pipe; 213, right zone first primary branch pipe; 214, right zone second primary branch pipe; 215, left zone first secondary branch pipe; 216, left zone second secondary branch pipe; 217, left zone third secondary branch pipe; 218, left zone fourth secondary branch pipe; 219, right zone first secondary branch pipe; 220, right zone second secondary branch pipe; 221, right zone third secondary branch pipe; 222, right zone fourth secondary branch pipe; 223, vibration motor; 2031, distribution plate; 2032, distribution rotating shaft; 2033, electric push rod outer shell; 2034, electric push rod shaft; 2035, rocker; 2036, electric push rod support seat; 2037, distribution mechanism housing; 2037a, feed inlet; 2037b, first discharge outlet; 2037c, second discharge outlet;

[0053] 3. Stone Mill Grinding Unit: 301. First individual stone mill unit in the left zone; 302. Second individual stone mill unit in the left zone; 303. Third individual stone mill unit in the left zone; 304. Fourth individual stone mill unit in the left zone; 305. First individual stone mill unit in the right zone; 306. Second individual stone mill unit in the right zone; 307. Third individual stone mill unit in the right zone; 308. Fourth individual stone mill unit in the right zone; 3011. Upper stationary mill; 3012. Lower moving mill; 3013. Matcha collection tray; 3014. Brush; 3015. Temperature sensor; 3016. Cooling copper plate; 3017. Refrigerator; 3018. Variable frequency motor; 3019. Variable frequency motor bracket; 3020. Upper stationary mill end cover; 3021. Reducer; 3022. Lower support plate for stone mill dust cover; 3023. 3024. Lower mill support bearing; 3025. Isolation sleeve; 3026. Mill hopper; 3027. Mill hopper support bracket; 3028. Hopper first photoelectric switch; 3029. Hopper first photoelectric switch reflector; 3030. Hopper second photoelectric switch reflector; 3031. First photoelectric switch bracket; 3032. First photoelectric switch reflector bracket; 3033. Ring bracket; 3034. Hopper first infrared glass plate; 3035. Hopper second infrared glass plate; 3036. Mill mandrel; 3037. Mill dust cover frame; 3038. First transparent glass plate; 3039. Second transparent glass plate; 3040. Elastic retaining ring; 3041. Ring retainer; 3042. Fixing rod;

[0054] 4. Support frame; 5. Collection unit; 501. Screw motor; 502. Screw motor connector; 503. Screw main shaft; 504. Screw blades; 505. Screw housing; 506. Matcha feeding pipe; 507. Screw frame;

[0055] 6. Feeding unit: 60. Vertical conveyor; 601. Vertical conveyor outlet; 602. Vertical conveyor motor.

[0056] 7. Condenser Detailed Implementation

[0057] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0058] like Figure 1 As shown, the stone mill matcha production line consists of a primary material distribution unit 1, a secondary material distribution unit 2, a stone mill grinding unit 3, a support frame 4, a collection unit 5, a feeding unit 6, and a condenser 7.

[0059] As shown in Figure 1 , 2 , 3, the feeding unit 6 includes a vertical conveyor 60, which includes a vertical conveyor discharge port 601, a vertical conveyor motor 602, etc. The vertical conveyor 60 is driven by the vertical conveyor motor 602, which is an asynchronous AC speed reducer motor with a rated power of 0.4 kw.

[0060] As shown in Figure 1 , 2 , 3, the primary distribution unit 1 is composed of a distribution conveyor and a distribution conveyor support frame 107. The distribution conveyor is mainly composed of a distribution conveyor speed reducer motor 101, a distribution conveyor driving shaft 102, a distribution conveyor driven shaft 103, a distribution conveyor motor support 104, a distribution conveyor belt 105, and a distribution conveyor frame 106. The upper part of the distribution conveyor frame 106 is provided with a through hole, which is hinged to the upper part of the distribution conveyor support frame 107. The bottom of the distribution conveyor support frame 107 is connected to the top of the support frame 4 by bolts.

[0061] The distribution conveyor reduction motor 101 is bolted on the distribution conveyor motor support 104, which is welded on the right lower side of the distribution conveyor frame 106; the distribution conveyor driving shaft 102 and the distribution conveyor driven shaft 103 are arranged at the two ends of the distribution conveyor belt 105 respectively; the distribution conveyor reduction motor 101 is connected with the distribution conveyor driving shaft 102 through the shaft coupling to transmit power and drive the distribution conveyor belt 105 to move, and the running speed of the distribution conveyor belt 105 is preset to 0.3 m / s; the distribution conveyor belt 105 is located below the vertical conveyor discharge port 601. The distribution conveyor reduction motor 101 is an asynchronous AC reduction motor with a rated power of 0.2 kw. When the matcha raw material in the stone mill upper hopper 309 above any single stone mill device in the stone mill grinding unit 3 is lower than the lowest material level, the vertical conveyor 60 feeds the primary distribution unit 1 after adjusting the discharge port of the corresponding distribution mechanism and connecting the material path between the vertical conveyor 60 and the stone mill upper hopper 309. The matcha raw material falls on the belt surface of the distribution conveyor belt 105 through the vertical conveyor discharge port 601; the distribution conveyor reduction motor 101 is powered and determines the forward and reverse rotation of the motor while the vertical conveyor 60 is feeding; the distribution conveyor reduction motor 101 rotates counterclockwise when the left zone stone mill grinding unit sends a signal that needs to be fed, and rotates clockwise when the right zone stone mill grinding unit sends a signal that needs to be fed, so that the matcha raw material on the belt surface of the distribution conveyor belt 105 is fed into the distribution left zone inlet hopper 201 or the distribution right zone inlet hopper 202. When the photoelectric sensor corresponding to the stone mill upper hopper 309 above the single stone mill unit in the lower stone mill grinding unit 3 detects that the material level of the corresponding stone mill upper hopper 309 reaches the highest position, the vertical conveyor 60 and the distribution conveyor reduction motor 101 are powered off at the same time.

[0062] As Figure 1 , 2, 3, 9, 10, the secondary material distribution unit 2 is shown by the material distribution left area hopper 201, the material distribution right area hopper 202, the left area first material distribution mechanism 203, the left area second material distribution mechanism 204, the left area third material distribution mechanism 205, the right area first material distribution mechanism 206, the right area second material distribution mechanism 207, the right area third material distribution mechanism 208, the left area total material pipe 209, the right area total material pipe 210, the left area first first-level branch material pipe 211, the left area second first-level branch material pipe 212, the right area first first-level branch material pipe 213, the right area second first-level branch material pipe 214, the left area first second-level branch material pipe 215, the left area second second-level branch material pipe 216, the left area third second-level branch material pipe 217, the left area fourth second-level branch material pipe 218, the right area first second-level branch material pipe 219, the right area second second-level branch material pipe 220, the right area third second-level branch material pipe 221, the right area fourth second-level branch material pipe 222, the vibration motor 223, the material distribution plate 2031, the material distribution rotating shaft 2032, the electric push rod shell 2033, the electric push rod shaft 2034, the rocker 2035, the electric push rod support seat 2036, the material distribution mechanism shell 2037 and the like.

[0063] The left and right feed hoppers 201 and 202 are identical in shape and size; the left first feed mechanism 203, left second feed mechanism 204, left third feed mechanism 205, right first feed mechanism 206, right second feed mechanism 207, and right third feed mechanism 208 are also identical in shape and size. The feed mechanism consists of a feed plate 2031, a feed rotating shaft 2032, an electric push rod housing 2033, an electric push rod shaft 2034, a rocker arm 2035, an electric push rod support 2036, and a feed mechanism housing 2037. The feed mechanism is a herringbone three-way valve type. The feed mechanism housing 2037 has three interconnected square feed ports with sides of 70mm: an inlet 2037a at the top, a first outlet 2037b at the bottom left, and a second outlet 2037c at the bottom right. Each feed port has a flange. The material distribution mechanism housing 2037 has an identical concentric cylindrical boss on both the front and rear sides, with a shaft hole at the center of the boss. The electric push rod housing 2033 is hinged on the left side to the electric push rod support 2036 on the outside of the material distribution mechanism housing 2037, and the electric push rod support 2036 is fixedly installed on the material distribution mechanism housing 2037. The electric push rod device is composed of the electric push rod housing 2033 and the electric push rod shaft 2034, and the drive end of the electric push rod shaft 2034 is hinged to the upper through hole of the rocker arm 2035. The rocker arm 2035 is hinged to the material distribution mechanism housing 2037 on its lower side and fixedly connected to the material distribution rotating shaft 2032 via a key. The material distribution rotating shaft 2032 is installed in the shaft hole of the material distribution mechanism housing 2037. A rectangular area with the same cross-sectional shape as the material distribution plate 2031 is cut off at the axis of the material distribution rotating shaft 2032. The lower part of the material distribution plate 2031 is fixed to the aforementioned rectangular area of ​​the material distribution rotating shaft 2032 by bolts. The width of the material distribution plate 2031 is the same as the width of the material path inside the material distribution mechanism. The electric push rod housing 2033 can rotate around the electric push rod support 2036. When the electric push rod device is energized, it can control the electric push rod shaft 2034 to perform telescopic movement relative to the electric push rod housing 2033. The electric push rod shaft 2034 drives the rocker arm 2035 and the material distribution rotating shaft 2032 to rotate around the axis of the material distribution rotating shaft 2032. The material distribution rotating shaft 2032 drives the material distribution plate 2031 to swing left and right. The electric linear actuator has an internal limit function and is the LUILEC X-101 model. For example... Figure 9 As shown, when the electric push rod shaft 2034 drives the distributing plate 2031 to rotate to the left along the axis until the upper part of the distributing plate 2031 is just in close contact with the left side of the inner wall of the distributing mechanism housing 2037, the inlet 2037a and the second outlet 2037c are connected, and all the matcha raw materials fall from the right. The position of the electric push rod shaft 2034 at this time is named the left rest point. Figure 10As shown, when the electric push rod shaft 2034 moves to the right to drive the distribution plate 2031 to rotate along the axis to the right, until the upper part of the distribution plate 2031 just closely adheres to the right side of the inner wall of the distribution mechanism shell 2037, at this time the feed inlet 2037a is communicated with the first discharge port 2037b, and the matcha raw materials fall from the left side, and the position of the electric push rod shaft 2034 at this time is named as the right rest point. The other side of the distribution mechanism shell 2037 of the second distribution mechanism 204 in the left area, the third distribution mechanism 205 in the left area, the second distribution mechanism 207 in the right area, and the third distribution mechanism 208 in the right area are all equipped with vibration motors 223, and the vibration motors 223 are installed at the geometric center of the side surface of the distribution mechanism shell 2037. When the distribution conveyor motor 101 and the vertical conveying motor 602 are powered on, the corresponding vibration motor 223 above the single stone mill device supplied by the system is powered on to start working, so as to prevent the matcha raw materials in the first and second branch pipes from being blocked, and make the matcha raw materials in the pipes smoothly fall into the corresponding stone mill hopper 309 below. When the photoelectric switch detects that the corresponding stone mill hopper 309 reaches the highest point, the vibration motor 223 is powered off after a delay of two seconds.

[0064] The left and right distribution hoppers 201 and 202 are the same in shape and size, and flanges are arranged at the lower discharge ports of the left and right distribution hoppers 201 and 202, and the discharge ports are square with a side length of 70 mm; the left and right total hoppers 209 and 210 are the same in shape and size, and the total hoppers are vertical square hoppers, the discharge ports are square with a side length of 70 mm, and flanges are arranged at the upper and lower discharge ports; the first and second left primary branch hoppers 211 and 212 and the first and second right primary branch hoppers 213 and 214 are the same in shape and size, and are arc-shaped hoppers, the discharge ports are square with a side length of 70 mm, and flanges are arranged at the upper and lower discharge ports; the first, second, third and fourth left secondary branch hoppers 215, 216, 217 and 218 and the first, second, third and fourth right secondary branch hoppers 219, 220, 221 and 222 are the same in shape and size, and are arc-shaped hoppers, the discharge ports are square with a side length of 70 mm, and flanges are arranged at the upper discharge ports. The left and right distribution hoppers 201 and 202 are installed on the support frame 4, and the geometric center of the left distribution hopper 201 is located below the left side of the distribution conveyor belt 105; the geometric center of the right distribution hopper 202 is located below the right side of the distribution conveyor belt 105. The left total hopper 209 is connected to the left distribution hopper 201 through bolts; the first left distribution mechanism 203 is connected to the lower part of the left total hopper 209 through bolts, and the electric push rod of the first left distribution mechanism 203 is installed outward; the first left primary branch hopper 211 is connected to the lower left part of the first left distribution mechanism 203 through bolts; the second left primary branch hopper 212 is connected to the lower right part of the first left distribution mechanism 203 through bolts; the left total hopper 209, the first left distribution mechanism 203, the first left primary branch hopper 211 and the second left primary branch hopper 212 are installed in a "person" shape. The second left distribution mechanism 204 is installed below the first left primary branch hopper 211 through bolts, and the electric push rod of the second left distribution mechanism 204 is installed to the left side; the first left secondary branch hopper 215 is connected to the lower left part of the second left distribution mechanism 204 through bolts; the second left secondary branch hopper 216 is connected to the lower right part of the second left distribution mechanism 204 through bolts; the first left primary branch hopper 211, the second left distribution mechanism 204, the first left secondary branch hopper 215 and the second left secondary branch hopper 216 are installed in a "person" shape.A left zone third sub-distributing mechanism 205 is installed below the left zone second primary branch material pipe 212 through bolting, and the electric push rod of the left zone third sub-distributing mechanism 205 is installed towards the right side; a left zone third second-level branch material pipe 217 is connected to the left lower material port of the left zone third sub-distributing mechanism 205 through bolting; a left zone fourth second-level branch material pipe 218 is connected to the right lower material port of the left zone third sub-distributing mechanism 205 through bolting; after installation of the left zone second primary branch material pipe 212, the left zone third sub-distributing mechanism 205, the left zone third second-level branch material pipe 217 and the left zone fourth second-level branch material pipe 218, a "human" shape structure is formed. Similarly, a right zone total material pipe 210 is connected below the material feeding hopper 202 in the right zone through bolting; a right zone first sub-distributing mechanism 206 is connected below the right zone total material pipe 210 through bolting, and the electric push rod of the right zone first sub-distributing mechanism 206 is installed outward; a right zone first primary branch material pipe 213 is connected to the left lower material port of the right zone first sub-distributing mechanism 206 through bolting; a right zone second primary branch material pipe 214 is connected to the right lower material port of the right zone first sub-distributing mechanism 206 through bolting; after installation of the right zone total material pipe 210, the right zone first sub-distributing mechanism 206, the right zone first primary branch material pipe 213 and the right zone second primary branch material pipe 214, a "human" shape structure is formed. A right zone second sub-distributing mechanism 207 is installed below the right zone first primary branch material pipe 213 through bolting, and the electric push rod of the right zone second sub-distributing mechanism 207 is installed towards the left side; a right zone first second-level branch material pipe 219 is connected to the left lower material port of the right zone second sub-distributing mechanism 207 through bolting; a right zone second second-level branch material pipe 220 is connected to the right lower material port of the right zone second sub-distributing mechanism 207 through bolting; after installation of the right zone first primary branch material pipe 213, the right zone second sub-distributing mechanism 207, the right zone first second-level branch material pipe 219 and the right zone second second-level branch material pipe 220, a "human" shape structure is formed. A right zone third sub-distributing mechanism 208 is installed below the right zone second primary branch material pipe 214 through bolting, and the electric push rod of the right zone third sub-distributing mechanism 208 is installed towards the right side; a right zone third second-level branch material pipe 221 is connected to the left lower material port of the right zone third sub-distributing mechanism 208 through bolting; a right zone fourth second-level branch material pipe 222 is connected to the right lower material port of the right zone third sub-distributing mechanism 208 through bolting; after installation of the right zone second primary branch material pipe 214, the right zone third sub-distributing mechanism 208, the right zone third second-level branch material pipe 221 and the right zone fourth second-level branch material pipe 222, a "human" shape structure is formed. The lower part of all second-level branch material pipes is opposite to the stone mill upper material hopper 3025 through the stone mill dust cover.

[0065] As Figure 1 , 4, 5, 6, 7, 8, 11, the stone mill grinding unit 3 by the first monomer stone mill device 301 left area, the second monomer stone mill device 302 left area, the third monomer stone mill device 303 left area, the fourth monomer stone mill device 304 left area, the first monomer stone mill device 305 right area, the second monomer stone mill device 306 right area, the third monomer stone mill device 307 right area, the fourth monomer stone mill device 308 right area, etc. Stone mill grinding unit 3 contains eight monomer stone mill device. Each monomer stone mill device is the same and is composed of the upper fixed mill 3011, the lower dynamic mill 3012, the matcha collection disc 3013, the brush 3014, the temperature sensor 3015, the refrigeration copper plate 3016, the refrigerator 3017, the variable frequency motor 3018, the variable frequency motor support 3019, the upper fixed mill end cover 3020, the speed reducer 3021, the stone mill dust cover lower support plate 3022, the lower stone mill support bearing 3023, the isolation sleeve 3024, the stone mill hopper 3025, the stone mill hopper support 3026, the first photoelectric switch 3027, the second photoelectric switch 3028, the first photoelectric switch reflector plate 3029, the second photoelectric switch reflector plate 3030, the first photoelectric switch support 3031, the first photoelectric switch reflector plate support 3032, the annular support 3033, the first infrared glass sheet 3034, the second infrared glass sheet 3035, the stone mill core shaft 3036, the stone mill dust cover rack 3037, the first transparent glass plate 3038, the second transparent glass plate 3039, the elastic retainer 3040, the annular fixator 3041 and the fixed rod 3042, etc.

[0066] The upper grinding mill 3011 is coaxially provided with a refrigeration cavity for installing a refrigeration device. Each refrigeration device is composed of a refrigeration copper plate 3016 and two refrigerators 3017. The refrigerators 3017 contain evaporators and other accessories inside. The two refrigerators 3017 are arranged on the upper surface of the refrigeration copper plate 3016 and are symmetrically arranged with respect to the center of the refrigeration copper plate 3016. The refrigeration copper plate 3016 is tightly installed on the lower surface of the refrigeration cavity of the upper grinding mill 3011, and the upper grinding mill end cover 3020 is covered at the opening of the refrigeration cavity of the upper grinding mill 3011, so that the refrigeration cavity where the refrigeration device is located is completely closed, thereby maximizing the refrigeration efficiency. The refrigeration device is connected to the external condenser 7. The refrigeration device absorbs the heat generated during the grinding process through the cooling medium to achieve refrigeration, while the condenser 7 releases the heat in the cooling medium to achieve heat circulation. The condenser 7 is installed on the side of the matcha production line. The temperature sensor 3015 is installed in the gap between the adjacent grinding lines of the upper grinding mill 3011. The temperature sensor 3015 is a PT100 type, which is used to detect the temperature of the grinding cavity during the grinding process to ensure that the matcha is ground at the most suitable grinding temperature of 19 degrees Celsius. The starting speed of the lower grinding mill 3012 is set to 40-60r / min. When the temperature detected by the temperature sensor 3015 is higher than 19 degrees Celsius, the variable frequency motor 3018 reduces the speed to slow down the grinding speed of the stone mill to ensure the quality of the matcha. When the detected temperature is lower than 19 degrees Celsius, the variable frequency motor 3018 increases the speed to speed up the grinding speed of the stone mill, thereby improving the grinding efficiency and ensuring the quality of the matcha.

[0067] The diameter of the stone mill of the upper grinding mill 3011 and the lower grinding mill 3012 is 360mm, and the thickness of the stone mill of the upper grinding mill 3011 is 155mm, and the thickness of the stone mill of the lower grinding mill 3012 is 95mm. The grinding lines of the upper grinding mill 3011 are downward, and the grinding lines of the lower grinding mill 3012 are upward, and the upper grinding mill 3011 is coaxially arranged above the lower grinding mill 3012, and the surfaces in contact with each other form a grinding cavity. Figure 8 As shown in the figure, the upper and lower stone mill grinding lines are the same, and the whole grinding line area is composed of nine same concentric small fan-shaped grinding line areas. The center of the fan-shaped grinding line area is on the stone mill edge line, and the center of the lower fan-shaped grinding line area is located on the left side. One side of each fan-shaped grinding line area coincides with the stone mill edge line, and the other side coincides with the outermost grinding line edge line of the adjacent fan-shaped grinding line area. Each fan-shaped grinding line area is composed of 11 grinding lines, each grinding line is 5mm wide and 3mm deep, the adjacent grinding lines are spaced 5mm apart, and the outermost grinding line edge line is 240mm in diameter. Since the grinding lines of the upper grinding mill 3011 and the lower grinding mill 3012 are the same, each grinding line of the upper grinding mill 3011 and each grinding line of the lower grinding mill 3012 are interlaced when matched. When the lower grinding mill 3012 is driven to move clockwise by the power system, the grinding lines of the upper grinding mill 3011 and the lower grinding mill 3012 shear the matcha raw materials in the grinding cavity for grinding, thereby improving the grinding efficiency.

[0068] The stone mill upper hopper support 3026 is arranged above the upper fixed mill end cover 3020, and the stone mill upper hopper 3025 is installed on the stone mill upper hopper support 3026. The stone mill upper hopper 3025 is a conical hopper. The lower opening of the stone mill upper hopper 3025 is directly opposite the feeding hole in the lower fixed mill 3011. The feeding hole is composed of a vertical hole with a diameter of 60 mm and a depth of 50 mm along the axis of the upper surface, and an inclined hole with a diameter of 60 mm at an angle of 45 degrees to the axis of the upper fixed mill 3011. The vertical hole and the inclined hole are smoothly connected at the intersection, and the inner edge of the feeding hole is polished to prevent the formation of a blockage of matcha raw materials in the feeding hole. The matcha raw materials in the stone mill upper hopper 3025 fall into the grinding cavity through the feeding hole.

[0069] A vertical circular hole with a diameter of 40 mm and a depth of 35 mm is coaxially arranged below the upper fixed mill 3011 and above the lower movable mill 3012. The stone mill core shaft 3036 is installed in the circular hole of the upper and lower stone mills. The stone mill core shaft 3036 has a diameter of 40 mm and a height of 64 mm. The upper part of the stone mill core shaft 3036 is in interference fit with the vertical circular hole of the lower surface of the upper fixed mill 3011, and the lower part of the stone mill core shaft 3036 is in clearance fit with the vertical circular hole of the lower surface of the lower movable mill 3012. The arrangement of the stone mill core shaft 3036 ensures that the upper fixed mill 3011 and the lower movable mill 3012 are in coaxial position. Annular fixing devices are installed on the outside of the upper fixed mill 3011. Each annular fixing device is composed of an annular holder 3041 and four fixing rods 3042. A strip groove is opened on the side edge of the upper fixed mill 3011 from the top to the lower part of the upper fixed mill 3011, and a strip groove with the same cross-sectional shape is opened on the side edge of the upper fixed mill end cover 3020, which are used to install the annular holder 3041. The annular holder 3041 is in the shape of a ring sleeve with a strip boss on the inner side of the sleeve. The annular holder 3041 is installed on the outer side surface of the upper fixed mill 3011 in clearance fit with the outer surface of the upper fixed mill 3011, and the inner side boss of the annular holder 3041 is located in the strip groove on the side edge of the upper fixed mill 3011 in clearance fit with the groove. Four bosses are distributed on the outer side of the annular holder 3041, and one end of the four fixing rods 3042 is connected to the four bosses by bolts, and the other end of the four fixing rods 3042 is installed on the variable frequency motor support 3019 by bolts. The annular fixing device is used to ensure that the upper fixed mill 3011 does not rotate with the lower movable mill 3012 during the grinding process of matcha. The circumferential fixation of the upper fixed mill is beneficial to simplify the feeding of the stone mill upper hopper 3025 and the layout of the optical switch, refrigerator, temperature sensor and other circuits; and the axial non-fixation, i.e. the upper fixed mill 3011 can slide up and down inside the annular holder 3041, is beneficial to the up and down floating of the upper fixed mill 3011 under the condition of its own gravity and the grinding reaction of matcha during the grinding process, which ensures the quality of matcha.

[0070] The stone mill dust cover is installed on the stone mill dust cover lower support plate 3022, which is installed above the variable frequency motor support 3019. The stone mill dust cover is composed of a stone mill dust cover rack 3037, a first transparent glass plate 3038, four second transparent glass plates 3039, and an elastic retaining ring 3040. The first transparent glass plate 3038 is installed above the stone mill dust cover rack 3037, and a square hole is left in the center of the first transparent glass plate 3038. The elastic retaining ring 3040 is installed in the square hole, and the bottom of the secondary material feeding pipe extends into the stone mill dust cover through the elastic retaining ring 3040. The four second transparent glass plates 3039 are installed on the four sides of the stone mill dust cover rack 3037. The first transparent glass plate 3038 and the second transparent glass plate 3039 are not shown in some figures.

[0071] The hopper first photoelectric switch 3027 and the hopper second photoelectric switch 3028 are both diffuse reflection type infrared photoelectric switches. The hopper first photoelectric switch 3027 is installed on the first photoelectric switch support 3031, and the first photoelectric switch support 3031 is installed on the upper fixed mill end cover 3020. The hopper first photoelectric switch 3027 is installed on the first photoelectric switch support 3031, and the first photoelectric switch support 3031 is installed on the upper fixed mill end cover 3020. The hopper first photoelectric switch 3027, the two hopper first infrared glass pieces 3034, and the hopper first photoelectric switch reflection plate 3029 are installed horizontally in a line, and the hopper first photoelectric switch 3027 and the hopper first photoelectric switch reflection plate 3029 are located on both sides of the stone mill upper hopper 3025. Similarly, the hopper second photoelectric switch 3028 is installed on one side of the ring-shaped support 3033, the hopper second photoelectric switch 3028 is installed on one side of the ring-shaped support 3033, the hopper second photoelectric switch 3028 is installed on one side of the ring-shaped support 3033, and the two hopper second infrared glass pieces 3035 are installed on the corresponding position of the stone mill upper hopper 3025. The hopper second photoelectric switch reflection plate 3030 is installed on the other side of the ring-shaped support 3033, and the ring-shaped support 3033 is installed on the outer surface of the stone mill upper hopper support 3026. The hopper second photoelectric switch 3028, the two hopper second infrared glass pieces 3035, and the hopper second photoelectric switch reflection plate 3030 are installed horizontally in a line, and the infrared light path formed by the hopper second photoelectric switch 3028, the two hopper second infrared glass pieces 3035, and the hopper second photoelectric switch reflection plate 3030 is offset from the center line of the stone mill upper hopper 3025 by 65mm, preventing the falling of the matcha raw material from the secondary branch pipe from blocking the infrared light path. The hopper first photoelectric switch 3027 and the hopper second photoelectric switch 3028 are used to detect whether the stone mill upper hopper 3025 is below the minimum material level and whether the feeding is complete. The hopper first photoelectric switch 3027 is diffuse reflection type, and when the photoelectric receiving tube can receive the infrared light emitted by the light-emitting tube, i.e. the light is reflected back by the hopper first photoelectric switch reflection plate 3029, the infrared light path is not blocked, proving that the matcha raw material in the stone mill upper hopper 3025 is below the minimum material level, and the feeding system needs to be fed. Similarly, the hopper second photoelectric switch 3028 is diffuse reflection type, and when the photoelectric receiving tube cannot receive the infrared light emitted by the light-emitting tube, i.e. the infrared light path is blocked by the matcha raw material in the hopper, proving that the matcha raw material in the stone mill upper hopper 3025 is above the maximum material level, and the feeding system stops feeding.

[0072] The matcha collection tray 3013 is bolted above the stone mill dust cover lower support plate 3022, which is bolted above the variable frequency motor support 3019. Four square holes are formed near the four corners of the stone mill dust cover lower support plate 3022, and four fixed rods 3042 pass through the four square holes respectively. The upper surface of the recessed cavity of the matcha collection tray 3013 is coaxially provided with two annular recesses, one inside and one outside. The lower surface of the lower mill 3012 is also coaxially provided with two annular recesses, and the shapes and sizes of the two inner recesses are the same. The outer recess of the lower mill 3012 is wider and deeper than the outer recess of the upper surface of the recessed cavity of the matcha collection tray 3013. The upper and lower surfaces of the lower stone mill support bearing 3023 are located in the two inner recesses respectively, and are rotatably connected with the lower mill 3012 and the matcha collection tray 3013. The arrangement of the lower stone mill support bearing 3023 greatly simplifies the design of the transmission system. Similarly, the upper and lower surfaces of the separation sleeve 3024 are located in the two outer recesses respectively, and the separation sleeve 3024 is in clearance fit with the outer recess of the lower mill 3012. The separation sleeve 3024 is arranged outside the lower stone mill support bearing 3023 to isolate the inner and outer environments of the separation sleeve 3024 and prevent the matcha in the matcha collection tray 3013 from being contaminated. The brush 3014 is installed in the slot formed at the edge of the lower surface of the lower mill 3012. The brush 3014 moves synchronously with the lower mill 3012, and sweeps the matcha powder into the matcha collection hole. The center line of the slot and the radius direction of the lower mill 3012 form an angle of 15 degrees, and the offset direction is opposite to the circumferential motion direction of the lower mill 3012. The design of the offset angle is beneficial to the collection of matcha, which makes the matcha powder converge to the edge of the recessed cavity of the matcha collection tray 3013 and fall into the matcha collection hole at the edge of the recessed cavity. The matcha collection hole is formed in the inner edge of the matcha collection tray 3013, and is in communication with the matcha dropping pipe 506 below. The matcha collection tray 3013 and the brush 3014 are made of food-grade materials. The lower mill 3012 is driven by the variable frequency motor 3018. The power shaft of the variable frequency motor 3018 is connected with the speed reducer 3021, and the output shaft of the speed reducer is connected with the lower mill 3012 through a key. The variable frequency motor 3018 and the speed reducer 3021 are bolted on the side of the variable frequency motor support 3019. The variable frequency motor 3018 selects a variable frequency speed reducer with a rated power of 0.5kw.

[0073] As Figure 1 , 4, 12, the matcha collection unit 5 is composed of two identical auger collection devices, each of which is composed of an auger motor 501, an auger motor connecting piece 502, an auger main shaft 503, an auger blade 504, an auger housing 505, a matcha dropping pipe 506, and an auger rack 507. The auger collection device includes an auger housing 505 mounted on the auger rack 507, and the auger housing 505 is provided with a matcha dropping pipe 506 in communication with the lumen. The top end of the matcha dropping pipe 506 is in communication with the matcha collection hole on the corresponding matcha collection disc 3013. The auger blade 504 is coaxially arranged in the lumen of the auger housing 505, and the auger blade 504 is fixedly connected to the auger main shaft 503 through a flange. The auger main shaft 503 is connected to the auger motor 501 through the auger motor connecting piece 502. The auger motor connecting piece 502 is bolted to the right end of the auger housing 505 and contains a shaft coupling inside. The left end of the auger housing 505 is the discharge end. The power of the auger collection device is transmitted from the auger motor 501 to the auger main shaft 503 through the shaft coupling and drives the auger blade 504 to rotate, which drives the matcha powder to the left end of the auger housing 505 and discharges it. The auger motor 501 is a variable frequency reduction motor with a rated power of 0.4kw.

[0074] The condenser 7 is located on the side of the matcha production line and cooperates with the refrigeration device to realize heat circulation.

[0075] Control method for automatic precise feeding of matcha raw materials:

[0076] (1) When the matcha production line is started for the first time, power is supplied to the six electric push rod devices, so that the six electric push rod shafts 2034 are reset to the left rest point, and the electric push rod devices are de-energized. The eight single stone mills are powered on and the refrigerators 3017 are powered on. The two auger motors 501 are powered on and operated.

[0077] (2) At this time, eight single stone mill devices in the left and right zones are fed in turn. First, the first single stone mill device 301 in the left zone is fed. The electric push rod devices on the first distribution mechanism 203 and the second distribution mechanism 204 in the left zone are powered on, so that the two electric push rod shafts 2034 are both at the right rest point. At the same time, the vibration motor 223 on the second distribution mechanism 204 in the left zone is powered on and works. The vertical conveyor motor 602 is powered on and works, and the speed reducer motor 101 of the distribution conveyor is powered on and rotates counterclockwise to drive the distribution conveyor belt 105 to rotate counterclockwise. The matcha raw materials are fed into the distribution left zone hopper 201, and then pass through the distribution left zone hopper 201, the left zone total material pipe 209, the first distribution mechanism 203 in the left zone, the first primary branch material pipe 211 in the left zone, the second distribution mechanism 204 in the left zone, the first secondary branch material pipe 215 in the left zone, and are fed into the stone mill upper hopper 3025 of the first single stone mill device 301 in the left zone. When the second photoelectric switch 3028 of the material hopper in the first single stone mill device 301 in the left zone cannot receive the infrared rays emitted by the light-emitting tube, the feeding of the first single stone mill device 301 in the left zone is completed. At the same time, the variable frequency motor 3018 of the first single stone mill device 301 in the left zone is powered on and works.

[0078] When the feeding of the first single stone mill device 301 in the left zone is completed, the electric push rod shaft 2034 on the second distribution mechanism 204 in the left zone is reset to the left rest point, and the second single stone mill device 302 in the left zone is fed. The matcha raw materials pass through the distribution left zone hopper 201, the left zone total material pipe 209, the first distribution mechanism 203 in the left zone, the first primary branch material pipe 211 in the left zone, the second distribution mechanism 204 in the left zone, the second secondary branch material pipe 216 in the left zone, and are fed into the stone mill upper hopper 3025 of the second single stone mill device 302 in the left zone. When the second photoelectric switch 3028 of the material hopper in the second single stone mill device 302 in the left zone cannot receive the infrared rays emitted by the light-emitting tube, the feeding of the second single stone mill device 302 in the left zone is completed. At the same time, the vibration motor 223 on the second distribution mechanism 204 in the left zone is powered off after a delay of 2 seconds; the variable frequency motor 3018 of the second single stone mill device 302 in the left zone is powered on and works.

[0079] When the feeding of the left area second single stone mill device 302 is completed, the electric push rod shaft 2034 of the left area first distribution mechanism 203 is reset to the left rest point, the electric push rod shaft 2034 of the left area third distribution mechanism 205 is energized to the right rest point, and the left area third single stone mill device 303 is fed. At the same time, the vibration motor 223 of the left area third distribution mechanism 205 is energized to work. The matcha raw materials are fed into the stone mill upper hopper 3025 of the left area third single stone mill device 303 through the left area feeding hopper 201, the left area total material pipe 209, the left area first distribution mechanism 203, the left area second first-stage branch material pipe 212, the left area third distribution mechanism 205, and the left area third second-stage branch material pipe 217; when the second photoelectric switch 3028 of the left area third single stone mill device 303 cannot receive the infrared rays emitted by the light-emitting tube, the feeding of the left area third single stone mill device 303 is completed. At the same time, the variable frequency motor 3018 of the left area third single stone mill device 303 is energized to work.

[0080] When the feeding of the left area third single stone mill device 303 is completed, the electric push rod shaft 2034 of the left area third distribution mechanism 205 is reset to the left rest point, and the left area fourth single stone mill device 304 is fed. The matcha raw materials are fed into the stone mill upper hopper 3025 of the left area fourth single stone mill device 304 through the left area feeding hopper 201, the left area total material pipe 209, the left area first distribution mechanism 203, the left area second first-stage branch material pipe 212, the left area third distribution mechanism 205, and the left area fourth second-stage branch material pipe 218; when the second photoelectric switch 3028 of the left area fourth single stone mill device 304 cannot receive the infrared rays emitted by the light-emitting tube, the feeding of the left area fourth single stone mill device 304 is completed. At the same time, the vibration motor 223 of the left area third distribution mechanism 205 is de-energized after a delay of 2 seconds; and the variable frequency motor 3018 of the left area fourth single stone mill device 304 is energized to work.

[0081] When the feeding of the fourth single stone mill device 304 in the left area is completed, the speed reducer motor 101 rotates clockwise, the electric push rod device on the first and second distribution mechanisms 206, 207 in the right area is energized, and the two distribution electric push rods 2034 are both in the right rest point, feeding the first single stone mill device 305 in the right area. At the same time, the vibration motor 223 on the second distribution mechanism 207 in the right area is energized to work. The matcha raw materials pass through the distribution right area hopper 202, the right area total material pipe 210, the first distribution mechanism 206 in the right area, the first primary branch material pipe 213 in the right area, the second distribution mechanism 207 in the right area, the first secondary branch material pipe 219 in the right area, and are fed into the stone mill upper hopper 3025 of the first single stone mill device 305 in the right area; when the hopper second photoelectric switch 3028 on the first single stone mill device 305 in the right area cannot receive the infrared rays emitted by its light-emitting tube, the feeding of the first single stone mill device 305 in the right area is completed. At the same time, the frequency conversion motor 3018 of the first single stone mill device 305 in the right area is energized to work.

[0082] When the feeding of the first single stone mill device 305 in the right area is completed, the electric push rod shaft 2034 on the second distribution mechanism 207 in the right area is reset to the left rest point, feeding the second single stone mill device 306 in the right area. The matcha raw materials pass through the distribution right area hopper 202, the right area total material pipe 210, the first distribution mechanism 206 in the right area, the first primary branch material pipe 213 in the right area, the second distribution mechanism 207 in the right area, the second secondary branch material pipe 220 in the right area, and are fed into the stone mill upper hopper 3025 of the second single stone mill device 306 in the right area; when the hopper second photoelectric switch 3028 on the second single stone mill device 306 in the right area cannot receive the infrared rays emitted by its light-emitting tube, the feeding of the second single stone mill device 306 in the right area is completed. At the same time, the vibration motor 223 on the second distribution mechanism 207 in the right area is de-energized after a delay of 2 seconds; the frequency conversion motor 3018 of the second single stone mill device 306 in the right area is energized to work.

[0083] When the feeding of the right area second single stone mill device 306 is completed, the electric push rod shaft 2034 of the right area first distribution mechanism 206 is reset to the left rest point, the electric push rod device of the right area third distribution mechanism 208 is powered on, and the electric push rod shaft 2034 is at the right rest point, so as to feed the right area third single stone mill device 307. At the same time, the vibration motor 223 of the right area third distribution mechanism 208 is powered on and works. The matcha raw materials are fed into the stone mill upper hopper 3025 of the right area third single stone mill device 307 through the distribution right area inlet hopper 202, the right area total material pipe 210, the right area first distribution mechanism 206, the right area second first-stage branch material pipe 214, the right area third distribution mechanism 208, and the right area third second-stage branch material pipe 221; when the hopper second photoelectric switch 3028 of the right area third single stone mill device 307 cannot receive the infrared rays emitted by the light-emitting tube, the feeding of the right area third single stone mill device 307 is completed. At the same time, the variable frequency motor 3018 of the right area third single stone mill device 307 is powered on and works.

[0084] When the feeding of the right area third single stone mill device 307 is completed, the electric push rod shaft 2034 of the right area third distribution mechanism 208 is reset to the left rest point, and the right area fourth single stone mill device 308 is fed. The matcha raw materials are fed into the stone mill upper hopper 3025 of the right area fourth single stone mill device 308 through the distribution right area inlet hopper 202, the right area total material pipe 210, the right area first distribution mechanism 206, the right area second first-stage branch material pipe 214, the right area third distribution mechanism 208, and the right area fourth second-stage branch material pipe 222; when the hopper second photoelectric switch 3028 of the right area fourth single stone mill device 308 cannot receive the infrared rays emitted by the light-emitting tube, the feeding of the right area fourth single stone mill device 308 is completed. At the same time, the vibration motor 223 of the right area third distribution mechanism 208 is powered off after a delay of 2 seconds; the variable frequency motor 3018 of the right area fourth single stone mill device 308 is powered on; the vertical conveyor motor 602 and the distribution conveyor reduction motor 101 are powered off.

[0085] At this time, the eight single stone mill devices in the left area and the right area are sequentially fed.

[0086] (3) When the photoelectric receiving tube of the first photoelectric switch 3027 of the hopper can accept the infrared rays emitted by its light-emitting tube, it indicates that the corresponding stone mill hopper 3025 has a low level below the lowest level, and sends a lack of material signal to the control system. The system performs fixed-point feeding according to the number of the single stone mill device to which the first photoelectric switch 3027 of the hopper belongs. The signal emitted by each photoelectric switch is relatively independent. If the number is the first single stone mill device 301 in the left area, first, the corresponding variable frequency motor 3018 of the first single stone mill device 301 in the left area stops rotating, the electric push rod device on the first and second distribution mechanisms 203 and 204 in the left area is energized, so that the two electric push rod shafts 2034 are both at the right rest point; the vibration motor 223 on the second distribution mechanism 204 in the left area is energized and works. The vertical conveyor motor 602 is energized and works, the speed reducer motor 101 of the distribution conveyor is energized and rotates counterclockwise to drive the distribution conveyor belt 105 to rotate counterclockwise, and the matcha raw materials are fed into the distribution left area hopper 201. The matcha raw materials are fed into the stone mill hopper 3025 on the first single stone mill device 301 in the left area through the distribution left area hopper 201, the left area total material pipe 209, the first distribution mechanism 203 in the left area, the first primary branch material pipe 211 in the left area, the second distribution mechanism 204 in the left area, and the first secondary branch material pipe 215 in the left area. When the second photoelectric switch 3028 of the hopper on the first single stone mill device 301 in the left area cannot receive the infrared rays emitted by its light-emitting tube, the corresponding variable frequency motor 3018 of the first single stone mill device 301 in the left area resumes rotating. At the same time, the vertical conveyor motor 602 and the speed reducer motor 101 of the distribution conveyor are de-energized, and the vibration motor 223 on the second distribution mechanism 204 in the left area is de-energized after a delay of 2 seconds. The electric push rod shafts 2034 on the first and second distribution mechanisms 203 and 204 in the left area are reset to the left rest point and then de-energized, and the feeding is completed.

[0087] Similarly, if the number is the second single stone mill device 302 in the left area, the only difference from the first single stone mill device 301 in the left area is that the corresponding variable frequency motor 3018 of the second single stone mill device 302 in the left area stops rotating, the electric push rod device on the second distribution mechanism 204 in the left area is not energized, and the electric push rod device on the first distribution mechanism 203 in the left area is energized, so that the electric push rod shaft 2034 is at the right rest point. The matcha raw materials are fed into the stone mill hopper 3025 on the second single stone mill device 302 in the left area through the distribution left area hopper 201, the left area total material pipe 209, the first distribution mechanism 203 in the left area, the first primary branch material pipe 211 in the left area, the second distribution mechanism 204 in the left area, and the second secondary branch material pipe 216 in the left area. When the second photoelectric switch 3028 of the hopper on the second single stone mill device 302 in the left area cannot receive the infrared rays emitted by its light-emitting tube, the corresponding variable frequency motor 3018 of the second single stone mill device 302 in the left area resumes rotating, the electric push rod shaft 2034 on the first distribution mechanism 203 in the left area is reset to the left rest point and then de-energized, and the feeding is completed.

[0088] Similarly, if the number is the left area third single stone mill device 303, and the left area first single stone mill device 301 only difference is that: the left area third single stone mill device 303 corresponding variable frequency motor 3018 stop rotation, the left area first material distribution mechanism 203 on the electric push rod device is not powered, the left area third material distribution mechanism 205 on the electric push rod device is powered, so that its electric push rod shaft 2034 is in the right rest point; the left area third material distribution mechanism 205 on the vibration motor 223 is powered on; matcha raw materials through the left area into the hopper 201, the left area total material pipe 209, the left area first material distribution mechanism 203, the left area second first level material pipe 212, the left area third material distribution mechanism 205, the left area third second level material pipe 217 are fed into the stone mill on the left area third single stone mill device 303 3025 hopper; when the left area third single stone mill device 303 on the hopper second photoelectric switch 3028 can't receive the infrared light from its light emitting tube, the left area third single stone mill device 303 corresponding variable frequency motor 3018 resume rotation; the left area third material distribution mechanism 205 on the vibration motor 223 is powered off after 2 seconds delay; the left area third material distribution mechanism 205 on the electric push rod shaft 2034 is powered off after resetting to the left rest point, and the feeding is finished.

[0089] Similarly, if the number is the left area fourth single stone mill device 304, and the left area first single stone mill device 301 only difference is that: the left area fourth single stone mill device 304 corresponding variable frequency motor 3018 stop rotation, the left area first material distribution mechanism 203 and the left area third material distribution mechanism 205 on the electric push rod device are not powered; the left area third material distribution mechanism 205 on the vibration motor 223 is powered on; matcha raw materials through the left area into the hopper 201, the left area total material pipe 209, the left area first material distribution mechanism 203, the left area second first level material pipe 212, the left area third material distribution mechanism 205, the left area fourth second level material pipe 218 are fed into the stone mill on the left area fourth single stone mill device 304 3025 hopper; when the left area fourth single stone mill device 304 on the hopper second photoelectric switch 3028 can't receive the infrared light from its light emitting tube, the left area fourth single stone mill device 304 corresponding variable frequency motor 3018 resume rotation, the left area third material distribution mechanism 205 on the vibration motor 223 is powered off after 2 seconds delay, and the feeding is finished.

[0090] Likewise, if the number is the right area first single stone mill device 305, and the first single stone mill device 301 of the left area is only different in that: the corresponding variable frequency motor 3018 of the right area first single stone mill device 305 stops rotating, the electric push rod device on the right area first distribution mechanism 206 and the right area second distribution mechanism 207 is powered on, so that the two electric push rod shafts 2034 are both at the right rest point; the distribution conveyor reducer motor 101 is powered on and rotates clockwise; the vibration motor 223 on the right area second distribution mechanism 207 is powered on and works; the matcha raw materials pass through the distribution right area hopper 202, the right area total material pipe 210, the right area first distribution mechanism 206, the right area first primary branch material pipe 213, the right area second distribution mechanism 207, the right area first secondary branch material pipe 219 and are fed into the stone mill hopper 3025 on the right area first single stone mill device 305; when the hopper second photoelectric switch 3028 on the right area first single stone mill device 305 cannot receive the infrared rays emitted by its light-emitting tube, the corresponding variable frequency motor 3018 of the right area first single stone mill device 305 resumes rotating; the vibration motor 223 on the right area second distribution mechanism 207 is powered off after a delay of 2 seconds; the electric push rod shafts 2034 on the right area first distribution mechanism 206 and the right area second distribution mechanism 207 are powered off after resetting to the left rest point, and the feeding is ended.

[0091] Likewise, if the number is the right area second single stone mill device 306, and the first single stone mill device 301 of the left area is only different in that: the corresponding variable frequency motor 3018 of the right area second single stone mill device 306 stops rotating, the electric push rod device on the right area second distribution mechanism 207 is not powered on, and the electric push rod device on the right area first distribution mechanism 206 is powered on, so that its electric push rod shaft 2034 is at the right rest point; the distribution conveyor reducer motor 101 is powered on and rotates clockwise; the vibration motor 223 on the right area second distribution mechanism 207 is powered on and works; the matcha raw materials pass through the distribution right area hopper 202, the right area total material pipe 210, the right area first distribution mechanism 206, the right area first primary branch material pipe 213, the right area second distribution mechanism 207, the right area first secondary branch material pipe 213, and are fed into the stone mill hopper 3025 on the right area second single stone mill device 306; when the hopper second photoelectric switch 3028 on the right area second single stone mill device 306 cannot receive the infrared rays emitted by its light-emitting tube, the corresponding variable frequency motor 3018 of the right area second single stone mill device 306 resumes rotating; the vibration motor 223 on the right area second distribution mechanism 207 is powered off after a delay of 2 seconds; the electric push rod shaft 2034 on the right area first distribution mechanism 206 is powered off after resetting to the left rest point, and the feeding is ended.

[0092] Similarly, if the number is the right area of the third single stone mill device 307, and the first single stone mill device 301 is different only in that: the corresponding variable frequency motor 3018 of the right area of the third single stone mill device 307 stops rotating, the electric push rod device on the right area of the first material distribution mechanism 206 is not powered, and the electric push rod device on the right area of the third material distribution mechanism 208 is powered, so that the electric push rod shaft 2034 is at the right rest point; the speed reducer motor 101 of the material distribution conveyor is powered to rotate clockwise; the vibration motor 223 on the right area of the third material distribution mechanism 208 is powered to work; the matcha raw material passes through the right area of the material distribution hopper 202, the right area of the total material pipe 210, the right area of the first material distribution mechanism 206, the right area of the second primary material pipe 214, the right area of the third material distribution mechanism 208, the right area of the third secondary material pipe 221, and is fed into the stone mill loading hopper 3025 on the right area of the third single stone mill device 307; when the second photoelectric switch 3028 on the right area of the third single stone mill device 307 cannot receive the infrared rays emitted by its light-emitting tube, the corresponding variable frequency motor 3018 of the right area of the third single stone mill device 307 resumes rotating; the vibration motor 223 on the right area of the third material distribution mechanism 208 is powered for 2 seconds; the electric push rod shaft 2034 on the right area of the third material distribution mechanism 208 is powered to reset to the left rest point, and the feeding is completed.

[0093] Similarly, if the number is the right area of the fourth single stone mill device 308, and the first single stone mill device 301 is different only in that: the corresponding variable frequency motor 3018 of the right area of the fourth single stone mill device 308 stops rotating, and the electric push rod devices on the right area of the first material distribution mechanism 206 and the right area of the third material distribution mechanism 208 are not powered; the speed reducer motor 101 of the material distribution conveyor is powered to rotate clockwise; the vibration motor 223 on the right area of the third material distribution mechanism 208 is powered to work; the matcha raw material passes through the right area of the material distribution hopper 202, the right area of the total material pipe 210, the right area of the first material distribution mechanism 206, the right area of the second primary material pipe 214, the right area of the third material distribution mechanism 208, and the right area of the fourth secondary material pipe 222, and is fed into the stone mill loading hopper 3025 on the right area of the fourth single stone mill device 308; when the second photoelectric switch 3028 on the right area of the fourth single stone mill device 308 cannot receive the infrared rays emitted by its light-emitting tube, the corresponding variable frequency motor 3018 of the right area of the fourth single stone mill device 308 resumes rotating; the vibration motor 223 on the right area of the third material distribution mechanism 208 is powered for 2 seconds, and the feeding is completed

[0094] When the single stone mill device is in the feeding process, other single stone mill devices send a lack of material signal, then wait for the current single stone mill device to complete the feeding, and then feed it in turn according to the time of the single stone mill device sending the lack of material signal.

[0095] (4) When the temperature sensor 3015 detects that the temperature of the grinding cavity is lower than 19 degrees Celsius, the corresponding variable frequency motor 3018 of the single stone mill device increases the speed; when the temperature sensor 3015 detects that the temperature of the grinding cavity is higher than 19 degrees Celsius, the corresponding variable frequency motor 3018 of the single stone mill device reduces the speed. The grinding cavity of the single stone mill device is always located near 19 degrees Celsius, which is the most suitable temperature for grinding matcha.

[0096] The above merely describes the preferred embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can make equivalent replacements or changes within the technical range disclosed by the present application according to the technical solution and the inventive concept of the present application, which should be covered within the protection scope of the present application.

Claims

1. A variable frequency electric stone mill matcha automatic production line, characterized in that, The application relates to a tea powder production device, which comprises a supply unit (6) for providing matcha raw materials, a primary distribution unit (1) arranged at the discharge end of the supply unit (6), a secondary distribution unit (2) arranged at the discharge end of the primary distribution unit (1), and the primary distribution unit (1) distributes the matcha raw materials to the secondary distribution unit (2) according to primary distribution conditions; the discharge end of the secondary distribution unit (2) is connected with each single stone mill device in a stone mill grinding machine group (3), and the secondary distribution unit (2) distributes the matcha raw materials to each single stone mill device according to secondary distribution conditions; the discharge end of each single stone mill device is communicated with a collecting unit (5) to collect the ground tea powder; the secondary distribution unit (2) comprises two or more groups of structure-same distribution parts, the distribution part comprises a three-way valve type left area first distribution mechanism (203), the left area first distribution mechanism (203) comprises a distribution mechanism shell (2037) provided with three material ports in communication with each other and in a "human" shape structure, each material port is a feeding port (2037a), a first discharge port (2037b) and a second discharge port (2037c), a distribution plate (2031) capable of reciprocating swing to make the feeding port (2037a) communicated with the first discharge port (2037b) or the second discharge port (2037c) is hinged at the intersection of the first discharge port (2037b) and the second discharge port (2037c), the first discharge port (2037b) is communicated with a left area first primary branch pipe (211), and the second discharge port (2037c) is communicated with a left area second primary branch pipe (212); the feeding port (2037a) is communicated with the bottom of a distribution left area feeding hopper (201) arranged at the discharge end of the primary distribution unit (1), and the distribution left area feeding hopper (201) is fixed on a support frame (4); the bottom of the left area first primary branch pipe (211) and the left area second primary branch pipe (212) is communicated with the distribution part, and the branch pipe in the distribution part is communicated with a corresponding stone mill feeding hopper (3025); the supply unit (6) comprises a vertical conveyor (60); the primary distribution unit (1) comprises a distribution conveyor support frame (107) installed on the top of the frame, a distribution conveyor is installed on the distribution conveyor support frame (107), and the distribution conveyor is arranged below the material falling track of the vertical conveyor (60); the distribution left area feeding hopper (201) and a distribution right area feeding hopper (202) are respectively located below the material falling track of the corresponding end part of the distribution conveyor.

2. The variable frequency electric stone mill tea rubbing automatic production line according to claim 1, characterized in that, The monomer stone mill device comprises a variable frequency motor support (3019) and a matcha collection disc (3013) fixedly installed on the variable frequency motor support (3019), a lower movable mill (3012) is coaxially and rotatably installed on the matcha collection disc (3013), and a variable frequency motor (3018) for driving the lower movable mill (3012) to rotate is installed on the variable frequency motor support (3019); an upper fixed mill (3011) fixedly arranged in a circumferential direction of an annular holder (3041) is coaxially arranged on the lower movable mill (3012), and the lower movable mill (3012) and the upper fixed mill (3011) are in contact with each other to form a grinding cavity; an inlet hole extending to the grinding cavity is formed through the upper fixed mill (3011) from top to bottom, and a stone mill feeding hopper (3025) is in communication with an inlet end of the inlet hole, the stone mill feeding hopper (3025) is coaxially and fixedly connected to the upper fixed mill (3011), and the stone mill feeding hopper (3025) is in communication with an outlet end of the secondary material distributing unit (2).

3. The variable frequency electric stone mill tea rubbing automatic production line according to claim 2, characterized in that, A concave cavity is coaxially recessed on an upper disc surface of the matcha collection disc (3013), the lower movable mill (3012) is arranged in the concave cavity, and the lower movable mill (3012) and the matcha collection disc (3013) are rotatably connected to each other by a lower stone mill support bearing (3023); an annular temporary storage cavity for storing tea powder is formed between an outer wall surface of the lower movable mill (3012) and a side wall of the concave cavity, and a collection hole for leaking material is formed through the matcha collection disc (3013) at a cavity bottom of the temporary storage cavity; a brush (3014) rotatable synchronously with the lower movable mill (3012) is installed on the lower movable mill (3012), and the brush (3014) performs one-way circular motion in the temporary storage cavity to sweep tea powder into the collection hole.

4. The variable frequency electric stone mill tea rubbing automatic production line according to claim 3, characterized in that, The upper fixed mill (3011) and the lower movable mill (3012) are arranged with grinding lines on the surfaces in contact with each other, the grinding lines comprise more than six fan-shaped grinding line areas, each fan-shaped grinding line area is uniformly distributed around the center of the contact surface, and the center of each fan-shaped grinding line area is located on the edge of the contact surface; one side of each fan-shaped grinding line area coincides with the edge of the contact surface, and the other side coincides with the arc line of the adjacent fan-shaped grinding line area.

5. The variable frequency electric stone mill tea rubbing automatic production line according to claim 4, characterized in that, An electric push rod support seat (2036) is fixedly installed on the outside of the material distributing mechanism shell (2037), the electric push rod comprises an electric push rod shell (2033) and an electric push rod shaft (2034), one end of the electric push rod shell (2033) is hinged to the electric push rod support seat (2036), and the driving end of the electric push rod shaft (2034) is hinged to a rocker (2035); the other end of the rocker (2035) is hinged to the material distributing mechanism shell (2037), a material distributing rotating shaft (2032) fixedly connected to the material distributing plate (2031) penetrates through the material distributing mechanism shell (2037) and is fixedly connected to the rocker (2035) to form an L-shaped structure, and the material distributing plate can swing under the driving of the rocker (2035); the hinged axis at the electric push rod support seat (2036), the axis of the material distributing rotating shaft (2032) and the hinged axis at the driving end of the electric push rod shaft (2034) are parallel to each other and do not coincide with each other.

6. The variable frequency electric stone mill tea rubbing automatic production line according to claim 5, characterized in that, The collecting unit (5) comprises an auger collecting device, the auger collecting device comprises an auger shell (505) mounted on an auger rack (507), the auger shell (505) is provided with a matcha dropping pipe (506) in communication with the lumen, the top end of the matcha dropping pipe (506) is in communication with the collecting hole on the corresponding matcha collecting disc (3013); the auger shell (505) is coaxially arranged with an auger blade (504) in the lumen, the auger blade (504) is fixedly connected with the auger main shaft (503) through a flange, the auger main shaft (503) is connected with the auger motor (501) shaft through a shaft coupling; the auger motor (501) is fixed on one end of the auger shell (505) through a flange, and the other end of the auger shell (505) is an outlet end.

7. The variable frequency electric stone mill tea rubbing automatic production line according to claim 6, characterized in that, The production line further comprises a stone mill dust cover lower support plate (3022) fixedly installed at the bottom of the matcha collecting disc (3013), the stone mill dust cover lower support plate (3022) is fixedly connected with a stone mill dust cover covering the outside of the single stone mill device; the stone mill dust cover comprises a stone mill dust cover rack (3037), a transparent glass is mounted on the side of the stone mill dust cover rack (3037), a first transparent glass plate (3038) is mounted on the top of the stone mill dust cover rack (3037), and a square hole is formed in the first transparent glass plate (3038) and in communication with the bottom end of the corresponding material feeding pipe, so that the matcha raw materials can smoothly fall into the stone mill feeding hopper (3025); The top of the upper fixed mill (3011) is recessed with a refrigeration cavity, a refrigeration device is installed in the refrigeration cavity, a small hole is formed in the gap between adjacent grinding lines of the upper fixed mill (3011), a temperature sensor (3015) for detecting the temperature of the grinding cavity is installed in the small hole, and an upper fixed mill end cover (3020) covers the cavity opening of the refrigeration cavity; The upper fixed mill end cover (3020) is provided with a hopper first photoelectric switch (3027) and a hopper first photoelectric switch reflection plate (3029) used in cooperation with the hopper first photoelectric switch (3027), two transparent holes for light to pass through are sequentially formed in the bottom of the stone mill feeding hopper (3025) along the propagation direction of the light of the hopper first photoelectric switch (3027); An annular support (3033) is arranged on the outside of the stone mill feeding hopper support (3026), the annular support (3033) is provided with a hopper second photoelectric switch (3028) and a hopper second photoelectric switch reflection plate (3030) used in cooperation with the hopper second photoelectric switch (3028), two transparent holes for light to pass through are sequentially formed in the top of the stone mill feeding hopper (3025) along the propagation direction of the light of the hopper second photoelectric switch (3028), and the propagation path of the light of the hopper second photoelectric switch (3028) and the dropping track of the material feeding pipe avoid each other; The production line further comprises a control module for receiving the signals emitted by the hopper first photoelectric switch (3027) and the hopper second photoelectric switch (3028), the control module outputs corresponding primary and secondary material distribution conditions, and then controls the corresponding units to make corresponding actions.

8. A control method of variable frequency electric stone mill tea polishing automatic production, characterized in that, The control method is suitable for the variable-frequency electric stone mill tea leaf rubbing automatic production line as claimed in claim 7, and comprises the following steps: S1: the control module controls the operation of each variable-frequency motor (3018) and auger motor (501); when the first photoelectric switch (3027) of a certain hopper detects that the amount of tea leaf rubbing raw material in the corresponding stone mill hopper (3025) is lower than the lower limit value, the first photoelectric switch (3027) of the hopper sends a signal to the control module, and after the control module receives the signal sent by the first photoelectric switch (3027) of the hopper, the control module controls the corresponding variable-frequency motor (3018) to stop rotating; S2: the control module controls the movement of the corresponding electric push rod shaft (2034) in the secondary material distribution unit (2) to connect the pipeline between the corresponding feeding hopper and the stone mill hopper (3025); the control module controls the operation of the vertical conveyor motor (602) in the vertical conveyor (60) to convey the tea leaf rubbing raw material on the conveying belt of the vertical conveyor to the material distribution conveyor; the control module controls the forward / reverse rotation of the material distribution conveyor to convey the tea leaf rubbing raw material on the conveying belt of the material distribution conveyor to the corresponding feeding hopper; S3: when the second photoelectric switch (3028) of the corresponding hopper detects that the amount of tea leaf rubbing raw material in the corresponding stone mill hopper (3025) is higher than the upper limit value, the control module controls the corresponding variable-frequency motor (3018) to resume rotating at this time; the vertical conveyor (60) and the material distribution conveyor stop the material distribution work, and the corresponding electric push rod shaft (2034) is reset; S4: the control module controls the auger motor (501) to collect the ground tea leaf rubbing powder.

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