A low-temperature grinding device and method for tea biscuit production using ultrafine grinding

Abstract

The application belongs to the field of food ultrafine grinding equipment, and provides a low-temperature grinding device and method for tea biscuit production through ultrafine grinding, which comprises a grinding tank, a discharging assembly, a feeding port, a grinding mechanism, a cooling mechanism, an exhaust assembly and a cleaning assembly; a clamping cavity is arranged on the inner wall of the grinding tank, and the cooling mechanism is arranged in the clamping cavity and the interior of the grinding tank, so that the cavity wall of the grinding tank and the cutting knives of the grinding mechanism can be simultaneously subjected to adhering type circulating low-temperature cooling, thereby solving the problem that the heat-sensitive nutritional components of medicinal and edible materials such as tea, dried tangerine or orange peel, lotus leaves and mulberry leaves are inactivated and the flavor deteriorates due to tool friction heating in the traditional ultrafine grinding process. The application can realize low-temperature ultrafine grinding of 200-mesh mixed raw materials of selenium-rich tea, dried tangerine or orange peel, mulberry leaves and lotus leaves, has the advantages of full-process low-temperature locking, no residue, difficulty in blocking the screen, high grinding qualification rate, automatic cleaning, and is suitable for the standardized and high-quality production and processing of special powder materials for tea biscuits.

Description

Technical Field

[0001] This invention belongs to the field of food ultrafine grinding equipment, and particularly relates to a low-temperature grinding device and method for ultrafine grinding of tea and biscuit. Background Technology

[0002] With the current upgrade in food consumption, the "snackification and functionalization of tea drinks" has become a mainstream trend. Consumers are no longer satisfied with simply drinking tea; they are pursuing convenient, delicious, and healthy tea-derived foods. Tea biscuits, as functional snacks, use selenium-rich tea, dried tangerine peel, mulberry leaves, lotus leaves, and other natural plants as core ingredients. These ingredients are rich in heat-sensitive active nutrients such as active selenium, tea polyphenols, hesperidin, plant flavonoids, and volatile oils, resulting in a unique flavor and high nutritional value. In the biscuit production process, the raw materials must be pulverized to a 200-mesh ultrafine powder to ensure a delicate texture, uniform quality, and even distribution of nutrients.

[0003] Existing traditional ultrafine grinding equipment mostly adopts a room temperature grinding mode of high-speed shearing and impact grinding. During the operation, the high-speed friction and impact of the blades will generate a large amount of instantaneous heat, and the temperature inside the chamber will rise rapidly to above 40°C. This can easily lead to the oxidation of tea polyphenols, the volatilization of volatile oils, the loss of active selenium, and the decomposition of flavonoids, which seriously damages the core nutritional value and natural flavor of the raw materials and reduces the quality and functionality of tea biscuits.

[0004] Meanwhile, the four types of raw materials have vastly different physical properties: lotus leaves and mulberry leaves are rich in fine, long, and tough fibers, which easily entangle the blades and accumulate on the walls; dried tangerine peel contains natural plant colloids, which easily clump together and clog the screen during the crushing process; selenium-rich tea has a brittle and tender texture, making it prone to over-crushing or uneven crushing. Existing equipment lacks targeted low-temperature cooling structures, anti-sticking and anti-clogging structures, and automatic cleaning structures, and generally suffers from four major defects: First, it can only cool the entire cavity and cannot directly cool the core crushing blades, so the high temperature of the blades still damages the activity of the raw materials; second, there is no dedicated scraping or air-blowing cleaning structure, resulting in prominent problems of material sticking to the blades, material hanging on the cavity walls, and screen clogging, leading to high material loss and low crushing efficiency; third, the screening mode is singular, and fine particles easily clog the screen holes, causing qualified powder to fail to be discharged in time, easily leading to over-crushing and poor taste. Summary of the Invention

[0005] The purpose of this invention is to provide a low-temperature grinding device and method for ultra-fine grinding of tea and biscuit, aiming to solve the technical problems of high grinding temperature, easy loss of nutrients, material adhesion and clogging of the screen, large residue, and poor grinding uniformity in the existing technology.

[0006] The present invention is implemented as follows: a low-temperature grinding device for ultra-fine grinding of tea biscuits includes a grinding jar, a feeding port at the top of the grinding jar, an integrated grinding mechanism inside, a clamping cavity with a cooling mechanism on the inner wall, a grading discharge component at the bottom, and is equipped with an exhaust component, an automatic cleaning component, and an air blowing unblocking component.

[0007] The core innovation of this invention lies in its dual-dimensional low-temperature cooling design and fully automatic anti-residue and anti-clogging structure: On the one hand, the cooling coil inside the clamping cavity achieves overall low-temperature temperature control of the grinding tank cavity, while the built-in cooling box adheres to the upper and lower surfaces of the cutting blade, achieving direct contact low-temperature cooling of the crushing blade, eliminating the damage to the activity of the raw material caused by the frictional heat of the blade from the source; on the other hand, the lifting blade achieves continuous material lifting and impact crushing, improving the ultrafine crushing accuracy, and with the cleaning brush, second air blowing port, and main shaft air blowing cleaning structure, it respectively achieves the cleaning of material accumulation on the side plate, the blowing off of material stuck to the blade, and the cleaning of residual material on the tank wall. At the same time, a two-stage screening and feeding mode is adopted to completely solve the problems of screen clogging, material residue, and uneven crushing.

[0008] The cooling mechanism adopts a closed-loop water circulation cooling mode. The annular cooling fins continuously maintain the coolant temperature at a low temperature, and the circulating water pump drives the coolant to circulate between the water tank, cooling box, and cooling coil to ensure that the cavity and blades are kept at a constant low temperature. The crushing mechanism uses a servo motor for precise speed adjustment to adapt to the crushing requirements of different materials. The discharge component can automatically collect qualified powder and circulate unqualified coarse materials for crushing. The exhaust component can flexibly switch the cavity exhaust mode to adapt to the pressure control requirements of different crushing stages.

[0009] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0010] 1. Low-temperature locking throughout the entire process to preserve the core nutrients of raw materials: The dual cooling mode of overall cooling of the chamber coil and direct cooling of the blade can simultaneously reduce the ambient temperature inside the tank and the working temperature of the cutting blade, completely eliminating the frictional heat and impact heat generated by high-speed crushing. The low-temperature condition throughout the process can effectively preserve the active selenium and tea polyphenols of selenium-rich tea, the volatile oil and hesperidin of tangerine peel, and the heat-sensitive active substances such as flavonoids of mulberry leaf and lotus leaf, avoiding nutrient inactivation and flavor deterioration, and greatly improving the functionality and taste quality of tea biscuits.

[0011] 2. Anti-sticking and anti-clogging, with extremely low material loss: The cooling box adheres to the blades to remove adhesive and fine powder, the cleaning brush continuously cleans the accumulated material on the side plate, and the second air outlet blows away residual material around the blades. Combined with the two-stage positive pressure screening and feeding mode, it completely solves the problems of tangerine peel sticking to the blades, fiber hanging on the wall, and screen plate clogging. The amount of material residue is greatly reduced, the loss rate is significantly reduced, and there is no need for frequent machine shutdowns for manual cleaning, which greatly improves the continuity of production.

[0012] 3. High uniformity of crushing and stable finished product quality: The main shaft is equipped with a combination of cutting blade and lifting blade, which can continuously lift the bottom deposited material, realize repeated impact and shearing crushing of the material, avoid material deposition and incomplete crushing, high 200 mesh powder passing rate, uniform particle size, no coarse fiber and hard particle residue, ensuring the tea biscuits have a delicate taste and consistent batch quality.

[0013] 4. Flexible structure and wide applicability: It can be adapted to raw materials with different physical properties such as crisp selenium-rich tea, hard tangerine peel, and tough fibrous mulberry leaves and lotus leaves. It has strong versatility. At the same time, the exhaust and discharge structure can be disassembled and maintained, and the filter components can be quickly replaced, making the equipment operation and maintenance convenient. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0015] Figure 2 This is a schematic diagram of the overall cross-sectional structure of the present invention.

[0016] Figure 3 In this invention Figure 2 Enlarged diagram of point A in the middle.

[0017] Figure 4 This is a schematic diagram of the cooling mechanism in this invention.

[0018] Figure 5 In this invention Figure 4 Enlarged diagram of point B in the middle.

[0019] Figure 6 In this invention Figure 4 Enlarged diagram of point C in the middle.

[0020] Figure 7 This is a schematic diagram of the cross-sectional structure of the cooling component in this invention.

[0021] Figure 8 This is a schematic diagram of the crushing mechanism and cleaning components in this invention.

[0022] Figure 9 In this invention Figure 8 Enlarged diagram of point D in the middle.

[0023] In the attached diagram: 1. Grinding jar; 2. Discharge assembly; 21. Sieve plate; 22. First exhaust pipe; 23. Sealing cap; 24. Collection bag; 25. Collection tank; 3. Feed inlet; 4. Crushing mechanism; 41. Servo motor; 42. Main shaft; 43. Cutting blade; 44. Cleaning brush; 45. Lifting blade; 5. Cleaning assembly; 51. First air pump; 52. First air outlet pipe; 53. Air exchange box; 54. Air inlet; 55. First air blowing port; 6. Exhaust assembly; 61. Sealing cap; 62. Pressure cap; 63. Exhaust hole; 64. Through Filter; 65. Second exhaust pipe; 7. Cooling mechanism; 71. Water storage tank; 72. Cooling box; 73. Cooling coil; 74. Annular cooling plate; 75. Arc-shaped mounting plate; 76. Mounting side plate; 77. Water pump; 78. Circulating water pump; 79. Return water pipe; 710. Water supply pipe; 711. Water supply branch pipe; 712. Air supply branch pipe; 713. Air supply pipe; 714. Second air pump; 715. Second air outlet pipe; 716. Second air blowing port; 717. Angled; 718. Partition plate; 719. Heat dissipation hole; 8. Clamping cavity. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0025] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0026] like Figures 1-9 As shown, this invention provides a low-temperature grinding device for ultra-fine grinding of tea biscuits, including a grinding jar 1, a grinding mechanism 4 installed on the grinding jar 1, one end of the grinding mechanism 4 extending into the interior of the grinding jar 1, and multiple sets of cutting blades 43 on the grinding mechanism 4. The grinding mechanism 4 is used to cut and grind the raw materials. The top of the grinding jar 1 is also equipped with a feed inlet 3 for feeding in a mixture of selenium-rich tea, dried tangerine peel, mulberry leaves and lotus leaves.

[0027] The inner wall of the grinding tank 1 is provided with an annular cavity 8. The cavity 8 is a closed hollow structure used to house the core component of the cooling mechanism 7. The output end of the cooling mechanism 7 extends into the grinding tank 1. The cooling mechanism 7 is used to cool the side wall of the grinding tank 1 and all the cutting blades 43 to reduce the temperature of the cutting blades 43 and prevent the temperature of the cutting blades 43 from rising and causing the raw material nutrients to be deactivated.

[0028] The bottom of the grinding tank 1 is equipped with a discharge component 2, which is used for 200-mesh qualified powder screening and collection and coarse material recycling and crushing. Unqualified raw materials will be continuously crushed in the grinding tank 1 to ensure the crushing rate of the raw materials.

[0029] Specifically, in this invention, the cooling mechanism 7 cools the inner wall of the grinding jar 1, keeping the cavity of the grinding jar 1 at a low temperature, and directly cools the cutting blade 43, preventing the cutting blade 43, which is in direct contact with the raw material, from damaging the nutritional components of the raw material, thereby improving the quality of the raw material.

[0030] The present invention provides a low-temperature grinding device for ultra-fine grinding of tea and biscuit making. In this embodiment, the grinding mechanism 4 further includes a servo motor 41 fixedly installed on the top of the grinding tank 1. A main shaft 42 is fixedly installed at the output end of the servo motor 41. Multiple sets of cutting blades 43 are fixedly installed at one end of the main shaft 42 that extends into the grinding tank 1. A lifting blade 45 is fixedly installed at the bottom end of the cutting blade 43. The lifting blade 45 is used to lift the raw material at the bottom of the grinding tank 1 so that the raw material and the cutting blade 43 collide with each other, thereby improving the cutting efficiency of the cutting blade 43.

[0031] Specifically, the lifting blade 45 is provided with an inclined guide slope on its side, which can lift the material deposited at the bottom of the tank upwards during rotation, so that the material continuously collides and shears with the cutting blade 43, thereby improving the crushing efficiency and uniformity.

[0032] The raw material is poured into the grinding tank 1 through the feed inlet 3 and the feed inlet 3 is sealed. The servo motor 41 is started. The servo motor 41 drives the cutting blade 43 to rotate through the spindle 42. The cutting blade 43 cuts the raw material. The qualified raw material powder will enter the discharge component 2 for storage after cutting. The unqualified raw material will continue to be crushed in the grinding tank 1 until it becomes qualified.

[0033] This invention provides a low-temperature grinding device for ultra-fine grinding of tea biscuits. In this embodiment, the cooling mechanism 7 includes a water tank 71, a cooling coil 73, and multiple cooling components. The water tank 71 is fixedly installed inside the cavity 8 and is filled with coolant. An annular cooling plate 74 is installed on the water tank 71 to cool the coolant inside, allowing the device to be used for a long time. Several heat dissipation holes 719 communicating with the cavity are opened on the side of the grinding tank 1 so that the heat generated by the annular cooling plate 74 can be discharged from the heat dissipation holes 719. The cooling coil 73 is coiled around the inner wall of the cavity 8. One end of the cooling coil 73 is connected to the water tank 71. A circulation component (not shown) is also installed inside the cavity 8. One end of the circulation component is connected to the other end of the cooling coil 73, and the other end of the circulation component is connected to the water tank 71. The circulation component is used to circulate the coolant in the water tank 71 into the cooling coil 73 to cool the inner wall of the grinding tank 1.

[0034] Multiple cooling components are installed inside the grinding jar 1. Each cooling component includes an arc-shaped mounting plate 75, two mounting side plates 76, and two cooling boxes 72. The arc-shaped mounting plate 75 is fixedly installed inside the grinding jar 1. The two mounting side plates 76 are fixedly connected to the sides of the arc-shaped mounting plate 75. The two cooling boxes 72 are respectively fixedly installed on the opposite sides of the two mounting side plates 76. The cooling boxes 72 are made of materials with high thermal conductivity and high elasticity, such as liquid metal-polymer composite materials (by uniformly dispersing gallium-based liquid metal fillers in elastic polymers such as silicone and polyurethane, an efficient heat-conducting network can be constructed), stone... Graphene fiber-based materials (graphene fibers are vertically aligned through a special process to form a heat-conducting pathway), high-filled elastomer composite materials (a large amount of thermally conductive ceramic powders such as alumina and boron nitride are filled into a rubber matrix), etc. The high elasticity of the material can fit the surface of the cutting blade 43, and the high thermal conductivity can quickly cool the cutting blade 43 to achieve flexible contact heat exchange. At the same time, it can scrape off the material adhering to the blade. The cooling box 72 is provided with a partition 718, which divides the cooling box 72 into two cooling chambers. The partition 718 has a through hole for connecting the two cooling chambers. The through hole is located on the side of the partition 718 away from the arc-shaped mounting plate 75.

[0035] The cooling mechanism 7 also includes a circulating water pump 78, which is fixedly installed in the clamping cavity 8. The inlet of the circulating water pump 78 is connected to the water storage tank 71 through a water pumping pipe 77. The outlet of the circulating water pump 78 is connected to a water supply pipe 710. The bottom of the water storage tank 71 is connected to a return water pipe 79. Each cooling box 72 has two chambers connected to a water supply branch pipe 711. One end of each water supply branch pipe 711 extends into the clamping cavity 8 and is connected to the water supply pipe 710 and the return water pipe 79, respectively.

[0036] Specifically, the position of the cooling box 72 is adapted to the position of the cutting blade 43. The two cooling boxes 72 in the same cooling assembly are located on the upper and lower sides of a set of cutting blades 43, so that the cutting blade 43 can pass through the two cooling boxes 72. The outer side of the cooling box 72 is coated with a wear-resistant coating, and the distance between the two cooling boxes 72 is less than the thickness of the cutting blade 43, so as to forcibly scrape off the adhesive and fine powder adhering to the blade surface.

[0037] The two cooling boxes 72 have beveled edges 717 on their opposite sides to guide the cutting blade 43.

[0038] In use, the circulating water pump 78 draws coolant from the water storage tank 71 through the water pumping pipe 77 and delivers it to each cooling chamber through the water supply pipe 710 and the water supply branch pipe 711. The coolant in the cooling chamber flows into another cooling chamber in the same cooling box 72 through the through hole, and then flows into the return water pipe 79 through the water supply branch pipe 711, and finally returns to the water storage tank 71, forming a cycle. When the cutting blade 43 passes through the cooling box 72, the surface of the cutting blade 43 contacts the surface of the cooling box 72. The cooling box 72 will carry away the heat from the cutting blade 43, and the coolant will carry away the heat from the surface of the cooling box 72, so that the cooling box 72 can always cool the cutting blade 43. The annular cooling plate 74 will cool the coolant in the water storage tank 71, so as to avoid the cooling effect of the cooling box 72 on the cutting blade 43 being reduced due to the increase in the temperature of the coolant in the water storage tank 71 after long-term use.

[0039] The present invention provides a low-temperature grinding device for ultra-fine grinding of tea biscuits. Due to the wide mounting side plate 76, raw materials easily fall onto the mounting side plate 76, making it impossible to grind these materials. Therefore, in this embodiment, multiple cleaning brushes 44 are installed on the main shaft 42. The cleaning brushes 44 are made of food-grade wear-resistant soft bristles, and their bottoms are tightly attached to the upper surface of the mounting side plate 76. When the main shaft 42 rotates, it can drive the cleaning brushes 44 to rotate synchronously, cleaning the material deposited on the surface of the mounting side plate 76 in real time, eliminating the problem of dead corners where materials cannot be ground.

[0040] The present invention provides a low-temperature grinding device for ultra-fine grinding of tea biscuits. After the raw material on the cutting blade 43 is scraped off by the cooling box 72, some raw material may adhere to the cooling box 72. Therefore, in this embodiment, the cooling mechanism 7 further includes a second air pump 714. The second air pump 714 is fixedly installed in the clamping cavity 8. The air outlet of the second air pump 714 is connected to a second air outlet pipe 715. Two air supply pipes 713 are connected to the second air outlet pipe 715. Two second air blowing ports 716 are opened on each of the arc-shaped mounting plates 75. The two second air blowing ports 716 are connected to air supply branch pipes 712. One end of the two air supply branch pipes 712 is connected to the two air supply pipes 713 respectively. Several air inlets connected to the clamping cavity 8 are opened on the side of the grinding tank 1.

[0041] The grinding jar 1 is also equipped with an exhaust assembly 6, which is used to discharge excess gas from the grinding jar 1.

[0042] Specifically, the second air inlet 716 is located between the two cooling boxes 72, which can blow off the raw material remaining on the bevel 717 so that it can continue to be cut.

[0043] During operation, the second air pump 714 is always running. The second air pump 714 draws in outside air through the air inlet and discharges it through the second air outlet 715, the air supply pipe 713 and the air supply branch pipe 712, and blows it out from the second air outlet 716. The second air outlet 716 blows off the raw material particles that are adhering between the two cooling boxes 72.

[0044] It is worth noting that the air inlet is located at the end of the clamping cavity 8 away from the second air pump 714. After the air enters the clamping cavity 8, the cooling coil 73 will cool the air, so as not to affect the maintenance of the low temperature in the grinding jar 1.

[0045] The present invention provides a low-temperature grinding device for ultra-fine grinding of tea biscuits. In this embodiment, the exhaust assembly 6 includes a second exhaust pipe 65 fixedly connected to the top of the grinding tank 1. The second exhaust pipe 65 communicates with the inside of the grinding tank 1. A pressure cap 62 is installed on the top of the second exhaust pipe 65. A filter sheet 64 is installed between the pressure cap 62 and the second exhaust pipe 65. The filter sheet 64 is used to prevent the raw material powder from being discharged from the second exhaust pipe 65. A plurality of exhaust holes 63 are opened on the pressure cap 62. A detachable cover 61 is installed on the exhaust holes 63.

[0046] Specifically, after the second air pump 714 discharges outside air into the grinding tank 1, the air inside the grinding tank 1 increases, and the excess air can be discharged from the exhaust port 63.

[0047] The pressure cap 62 and the second exhaust pipe 65 are threaded together, and the pressure cap 62 and the cover 61 are threaded together, so that the filter 64 can be replaced. When not in use, the cover 61 can be installed on the pressure cap 62, and when in use, the cover 61 can be removed.

[0048] This invention provides a low-temperature grinding device for ultra-fine pulverization in tea biscuit making. In this embodiment, the discharge component 2 includes a collection tank 25, which is detachably installed at the bottom of the grinding tank 1 and communicates with the grinding tank 1. A sieve plate 21 is provided between the collection tank 25 and the grinding tank 1. The sieve plate 21 is used to screen the raw materials. Qualified raw material particles can pass through the sieve plate 21 and enter the collection tank 25. A collection bag 24 is installed inside the collection tank 25. The collection bag 24 is made of breathable fabric. Raw material particles that pass through the sieve plate 21 will fall into the collection bag 24. A first exhaust pipe 22 is connected to the side of the collection tank 25. A cap 23 is detachably installed at the end of the first exhaust pipe 22.

[0049] Specifically, the bottom of the lifting knife 45 contacts the surface of the screen plate 21, thereby pushing out and cutting large particles of raw material stuck on the surface of the screen plate 21, thus preventing the screen plate 21 from being blocked.

[0050] Although this structure avoids the screen plate 21 from being blocked by large particles, there is still a risk of it being blocked by small particles. Therefore, the crushing process can be divided into two stages. In the first stage, the first exhaust pipe 22 can be blocked by the cap 23 and the cover 61 can be opened to allow air to be discharged from the exhaust port 63. In this stage, the raw materials are mainly cut and crushed by the cutting blade 43. In the second stage, the cover 61 is blocked and the cap 23 is opened. The air entering from the second air outlet 716 will pass through the screen plate 21 and the collection bag 24 and be discharged from the first exhaust pipe 22. When small particles are blocked in the screen plate 21, the grinding tank 1 is under a slight positive pressure. The air will blow the material blocked in the screen plate 21 into the collection bag 24, accelerate the material discharge, improve the cutting efficiency, and avoid over-cutting, which would affect the taste of the biscuits.

[0051] This invention provides a low-temperature grinding device for ultra-fine grinding of tea biscuits. During the grinding process, raw materials may adhere to the inner wall of the grinding jar 1, preventing them from being discharged. Therefore, in this embodiment, a cleaning component 5 is also installed on the grinding jar 1. The cleaning component 5 includes a first air pump 51 and an air exchange box 53. The first air pump 51 is fixedly installed on the top of the grinding jar 1, and the air exchange box 53 is fixedly installed on the inner top of the grinding jar 1. The main shaft 42 passes through the air exchange box 53. The air outlet of the first air pump 51 is connected to a first air outlet pipe 52. One end of the first air outlet pipe 52 is connected to the air exchange box 53. The main shaft 42 has a hollow structure. An air inlet 54 is opened on the side of the main shaft 42 inside the air exchange box 53. Several first air blowing ports 55 are opened on the side of the main shaft 42 inside the grinding jar 1. The first air blowing ports 55 are inclined downward.

[0052] Specifically, during use, after the grinding is completed, the first air pump 51 is started, and the first air pump 51 blows air into the air exchange box 53. The air enters the main shaft 42 from the air inlet 54 and is blown out from the first air outlet 55. Then, the servo motor 41 is started, and the servo motor 41 drives the main shaft 42 to rotate, which can thoroughly clean the inner wall of the grinding tank 1, blow the material adhering to the inner wall of the grinding tank 1 to the bottom of the grinding tank 1, and let it fall into the collection bag 24 through the screen plate 21. At this time, the cover 61 should be closed and the cap 23 should be opened.

[0053] How to use:

[0054] The specific operation steps of the device of this invention are divided into four processes: equipment pretreatment, two-stage crushing and screening, fully automatic cleaning, and discharge and collection, as detailed below:

[0055] 1. Equipment pretreatment: Check the integrity of each pipeline, sealing structure, and filter 64. Close the feed inlet 3. Turn on the annular cooling plate 74 and circulating water pump 78 to pre-cool the coolant in the water storage tank 71, the grinding tank 1 cavity, and the cooling box 72 in advance, so that the temperature inside the cavity is kept stable at a low temperature. Start the equipment self-test to confirm that each motor, air pump, and pipeline is operating normally.

[0056] 2. First stage: Low-temperature shearing coarse crushing: The pre-treated and dried selenium-rich tea, dried tangerine peel, mulberry leaves, and lotus leaves are fed into the grinding tank 1 through the feed inlet 3 according to the proportion, and the feed inlet 3 is sealed; the cap 23 at the end of the first exhaust pipe 22 is sealed, and the cap 61 on the exhaust hole 63 is removed to allow unobstructed exhaust from the top of the chamber; the servo motor 41 and the second air pump 714 are started, the servo motor 41 drives the main shaft 42 to rotate at high speed, the cutting blade 43 performs high-speed shearing and crushing of the material, and the lifting blade 45 continuously lifts the material at the bottom to achieve cyclic impact crushing; the cooling mechanism 7 works throughout the process to continuously cool the chamber and the blades to prevent the material from becoming inactive at high temperature; the cleaning brush 44 and the second air blowing port 716 work simultaneously to clean up accumulated and sticky material in real time. This stage mainly completes the initial crushing of the material and significantly reduces the particle size of the material.

[0057] 3. Second stage: Positive pressure sieving and fine grinding: After the material is initially pulverized, the cap 61 on the pressure cap 62 is sealed, and the cap 23 of the first exhaust pipe 22 is opened; the second air pump 714 continuously introduces low-temperature airflow, so that a slightly positive pressure environment is formed inside the grinding tank 1. The high-pressure airflow penetrates the mesh of the screen plate 21, blowing the fine particles blocked in the screen holes to the collection bag 24, accelerating the passage of qualified 200-mesh powder through the screen; unqualified coarse particles and coarse fibers are intercepted inside the grinding tank 1 and continuously sheared and pulverized by the cutting blade 43 until the fineness of 200 mesh is reached, completely avoiding the problem of over-pulverization of materials and screen clogging, and ensuring that the powder is uniform and fine.

[0058] 4. Fully Automatic Residue Cleaning: After crushing and screening are completed and the equipment is stopped, keep the cover 61 sealed and the cap 23 open; start the first air pump 51, and the high-pressure airflow enters the hollow main shaft 42 and is sprayed out at high speed from the inclined first air blowing port 55. At the same time, start the servo motor 41 at low speed, and the main shaft rotates 360° to blow away the residual material on the inner wall and dead corner of the tank. All the residual material is blown to the bottom of the tank and enters the collection bag 24 through the screen plate 21, maximizing the recovery of materials and reducing losses.

[0059] 5. Material Discharge and Equipment Maintenance: Turn off all power components. After the air pressure in the equipment cavity is balanced and the temperature drops to room temperature, disassemble the collection tank 25, take out the internal collection bag 24, and complete the collection of 200-mesh ultrafine powder. Replace the filter plate 64 with the removable pressure cap 62, clean the residual impurities on the screen plate 21, and complete the simple maintenance of the equipment in preparation for the next use.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0061] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A low-temperature grinding device for tea biscuit production using ultrafine grinding, comprising a grinding tank, a feeding inlet is fixedly installed on the top of the grinding tank, and a crushing mechanism is assembled in the interior of the grinding tank, characterized in that, The grinding jar has an annular cavity on its inner wall, a cooling mechanism is installed inside the cavity, a discharge assembly is detachably installed at the bottom of the grinding jar, an exhaust assembly is installed at the top of the grinding jar, and a cleaning assembly is assembled inside the grinding jar. The cooling mechanism includes a water tank embedded inside the cavity, a cooling coil coiled around the inner wall of the cavity, multiple sets of cooling components and a circulating water pump. An annular cooling fin is installed on the outside of the water tank, and several heat dissipation holes are opened on the side wall of the cavity. The cooling assembly includes an arc-shaped mounting plate, two mounting side plates, and two cooling boxes. The two cooling boxes are symmetrically fixed to the opposite sides of the two mounting side plates. Each cooling box has a partition inside, which divides the interior of the cooling box into two connected cooling chambers. The inlet of the circulating water pump is connected to the water storage tank through a pumping pipe, the outlet of the circulating water pump is connected to the water supply pipe, the bottom of the water storage tank is connected to the return water pipe, and the two cooling chambers of the cooling box are connected to the water supply pipe and the return water pipe respectively through water supply branch pipes.

2. The low-temperature grinding device for ultrafine grinding in tea biscuit making according to claim 1, characterized in that, The crushing mechanism includes a servo motor fixed to the top of the grinding tank. The output end of the servo motor is fixedly connected to the main shaft. The lower end of the main shaft extends into the interior of the grinding tank and is fixedly installed with multiple sets of cutting blades. Each set of cutting blades has a lifting blade fixedly installed at its bottom.

3. The low-temperature grinding device for ultrafine grinding in tea biscuit making according to claim 2, characterized in that, Multiple sets of cleaning brushes are fixedly installed on the main shaft, and the bottom of each set of cleaning brushes is in contact with the upper surface of the corresponding mounting side plate.

4. The low-temperature grinding device for ultrafine grinding in tea biscuit making according to claim 1, characterized in that, The cooling mechanism also includes a second air pump, which is fixedly installed inside the clamping cavity. The air outlet of the second air pump is connected to a second air outlet pipe, and the second air outlet pipe is split and connected to two air supply pipes. The surface of the arc-shaped mounting plate has two second air inlets, which are connected to the air supply pipe through the air supply branch pipe. The side wall of the grinding tank has an air inlet that is connected to the clamping cavity.

5. The low-temperature grinding apparatus for ultrafine grinding in tea biscuit making according to claim 1 or 4, characterized in that, The exhaust assembly includes a second exhaust pipe fixed to the top of the grinding tank. A pressure cap is threaded onto the top of the second exhaust pipe. A filter is clamped and fixed between the pressure cap and the second exhaust pipe. Several exhaust holes are opened on the surface of the pressure cap. The exhaust holes are fitted with detachable caps.

6. The low-temperature grinding device for ultrafine grinding in tea biscuit making according to claim 2, characterized in that, The cleaning assembly includes a first air pump fixed to the top of the grinding tank and an air exchange box fixed to the top inside the grinding tank. The main shaft is a hollow tubular structure that passes through the air exchange box. The air outlet of the first air pump is connected to a first air outlet pipe, and the first air outlet pipe is connected to the air exchange box. An air inlet is provided on the side wall inside the air exchange box of the main shaft. Several inclined downward air blowing ports are evenly provided on the side wall inside the grinding tank of the main shaft.

7. The low-temperature grinding device for ultrafine grinding in tea biscuit making according to claim 2, characterized in that, The two cooling boxes of the same cooling assembly are respectively arranged on the upper and lower sides of a set of cutting blades. The two mounting side plates are set at an angle to each other to guide the rotating cutting blades, and the distance between the two mounting side plates is less than the thickness of the cutting blades.

8. The low-temperature grinding device for ultrafine grinding in tea biscuit making according to claim 1, characterized in that, The discharge assembly includes a collection tank that is detachably installed at the bottom of the grinding tank. A sieve plate is fixed between the collection tank and the grinding tank. A breathable collection bag is installed inside the collection tank. A first exhaust pipe is connected to the side of the collection tank. A cap is detachably installed at the end of the first exhaust pipe.

9. A method for pulverizing raw materials using a low-temperature grinding apparatus for ultrafine grinding of tea biscuits as described in claim 8, characterized in that, Includes the following steps: S01. Equipment Pretreatment: Check the integrity of each pipeline, sealing structure, and filter of the equipment, close the feed port, turn on the cooling mechanism, pre-cool the grinding tank cavity in advance, so that the temperature inside the cavity is kept stable at a low temperature and constant temperature, start the equipment self-test, and confirm that each electrical component is operating normally. S02. First stage: Low temperature shear coarse crushing: The pre-treated and dried raw materials are fed into the grinding tank through the feed inlet according to the proportion, the feed inlet is closed, the discharge component is blocked, the exhaust component is opened to ensure smooth exhaust at the top of the chamber, the crushing mechanism is started, the crushing mechanism performs high-speed shear crushing of the material, the cooling mechanism works throughout the process to continuously cool the chamber and the blades. This stage mainly completes the initial crushing of the material and significantly reduces the particle size of the material. S03. Second stage: Positive pressure sieving and fine grinding: After the material is initially pulverized, the exhaust component is closed, the cap of the first exhaust pipe is opened, and a slightly positive pressure environment is formed inside the grinding tank. The high-pressure airflow penetrates the screen plate mesh, blowing the fine particles blocked in the screen holes down to the collection bag, accelerating the passage of qualified 200-mesh powder through the screen. Unqualified coarse particles and coarse fibers are intercepted inside the grinding tank and continuously sheared and pulverized until the fineness of 200 mesh is reached, ensuring that the powder is uniform and fine. S04. Fully automatic residual material cleaning: After crushing and screening are completed and the equipment is stopped, keep the exhaust component closed and the cap open, start the cleaning component and crushing mechanism to rotate and blow the inner wall of the tank 360°. All residual materials are blown to the bottom of the tank and enter the collection bag through the screen plate to maximize material recovery and reduce loss. S05. Material Discharge and Equipment Maintenance: Turn off all power components. After the air pressure in the equipment cavity is balanced and the temperature drops to room temperature, disassemble the collection tank, take out the internal collection bag, complete the collection of 200-mesh ultrafine powder, and complete the simple maintenance of the equipment for the next use.

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