Ultrahigh-speed cutting type precision grinding machine

Abstract

The invention relates to the technical field of material precision machining equipment, and discloses an ultra-high-speed cutting type precision grinding machine which comprises a rack, a driving device, a grinding cavity provided with a feeding port and a discharging port, and a rotary movable cutter assembly and a fixed static cutter assembly which are arranged in the grinding cavity and driven by a main shaft. And a combined sealing structure is arranged at a relative motion interface between the rotary moving cutter assembly and the fixed static cutter assembly and comprises a non-contact labyrinth seal and a contact mechanical seal which are sequentially arranged in the potential leakage direction of materials. Through the combined sealing design of labyrinth sealing and mechanical sealing, multiple barriers are arranged on a key material leakage path, the labyrinth sealing dissipates material kinetic energy in advance and blocks most materials, and the mechanical sealing provides final reliable end face sealing, so that the leakage rate is reduced, coarse and fine materials are effectively prevented from being mixed, and the sealing effect is improved. And extremely high particle size uniformity and consistency of the ground product are ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of material precision processing equipment, in particular to a super-high-speed cutting type precision grinding machine. BACKGROUND

[0002] In the fields of food (such as peanut butter, sesame paste, nut butter), medicine (such as traditional Chinese medicine grinding, plant juice extraction), chemical industry, etc., it is often necessary to finely grind the materials to obtain uniform and delicate products. The existing technology mainly relies on stone mills, colloid mills, grinding wheels, ball mills or high-speed shearing equipment based on the cooperation of dynamic and static knives. However, these devices have the following bottlenecks:

[0003] 1. Leakage and pollution caused by poor sealing: Traditional devices mostly use single mechanical seals or labyrinth seals, which have limited sealing effect under high-viscosity material and high-speed working conditions, and there is significant leakage (up to 1%-2%). The leakage of unground materials mixed with fine materials seriously deteriorates the uniformity of the product, and the leaked materials also accumulate in the non-working area of the device;

[0004] 2. High temperature and pasting caused by accumulated leakage: The accumulated materials continuously rub against the high-speed rotating parts (such as the main shaft and the bottom of the dynamic knife), generating local high temperature, which easily causes thermal denaturation (pasting) of heat-sensitive materials, affecting product quality and causing cleaning difficulties;

[0005] 3. Lack of effective flow guide, exacerbating wear and temperature rise: If the ground materials have no reasonable flow path, they will flow back to the main shaft driving area along the surface of the static part, not only exacerbating the above friction and heating problems, but also accelerating the wear of the mechanical seal and the bearing, significantly shortening the service life of the core components and increasing the maintenance cost.

[0006] Therefore, it is of great significance to develop a high-speed precision grinding device that can effectively solve the problems of sealing leakage, prevent material accumulation and pasting, and have excellent flow guiding ability, in order to improve product quality, ensure stable operation of the device, and prolong the service life of the device. SUMMARY

[0007] The purpose of the present application is to overcome the defects of poor sealing, easy leakage, high temperature pasting and component wear caused by material accumulation in the existing high-speed shearing grinding equipment, and to provide a super-high-speed cutting type precision grinding machine with multiple sealing structures, active flow guiding function, more stable and reliable operation, and higher uniformity of grinding particle size.

[0008] The super-high-speed cutting type precision grinding machine provided by the present application comprises a rack, a driving device, a grinding chamber provided with a feeding port and a discharging port, and a rotating dynamic knife assembly and a fixed static knife assembly arranged in the grinding chamber and driven by a main shaft;

[0009] A combined sealing structure is arranged at the relative motion interface between the rotating moving knife assembly and the fixed stationary knife assembly, which includes a non-contact labyrinth seal and a contact mechanical seal arranged in sequence along the potential material leakage direction;

[0010] A flow guide structure is arranged at the bottom or downstream side of the fixed stationary knife assembly, which can guide the milled material out of the stationary knife assembly to the discharge port and away from the assembly area between the main shaft and the stationary components in the grinding chamber;

[0011] The combined sealing structure forms a double barrier, the labyrinth seal dissipates the kinetic energy of the material first and blocks most of the material, and the mechanical seal realizes the final precise sealing, greatly reduces the leakage rate, and avoids the mixing of coarse and fine materials; the flow guide structure actively guides the material flow direction to prevent material accumulation in the sealing and main shaft assembly area, thereby eliminating the problems of high temperature pasting and component wear from the root, and both of them cooperate to ensure stable operation of the equipment and product quality.

[0012] As a further optimized scheme of the present application, the non-contact labyrinth seal is formed by at least one annular protrusion and at least one corresponding annular groove, one of the rotating moving knife assembly and the fixed stationary knife assembly or the sealing ring fixed thereto is provided with an annular protrusion, and the other is provided with a corresponding annular groove, and there is a running gap between the annular protrusion and the annular groove;

[0013] The annular protrusion and the groove are embedded to form a zigzag leakage channel, which prolongs the material leakage path and dissipates its kinetic energy, and the sealing effect is remarkable; the running gap avoids direct contact between rotating and stationary components, has no friction and wear, is suitable for super-speed rotation working condition, and prolongs the service life of the sealing structure.

[0014] As a further optimized scheme of the present application, the number of the annular protrusions and the annular grooves is multiple, forming a multi-stage labyrinth seal, the multi-stage design further increases the complexity of the leakage channel, improves the sealing reliability, even if a small amount of material penetrates the previous stage, it can still be blocked by the subsequent level, and it is suitable for high viscosity and high pressure working conditions, further reduces the leakage rate, and guarantees the product purity.

[0015] As a further optimized scheme of the present application, the contact mechanical seal includes a moving knife sealing dynamic ring fixed to the rotating moving knife assembly and rotates with it, and a moving knife sealing static ring fixed to the fixed stationary knife assembly or the stationary components in the grinding chamber, the end faces of the moving knife sealing dynamic ring and the moving knife sealing static ring are in contact under pressure;

[0016] The dynamic ring and stationary ring end faces are in close contact to form a dynamic sealing surface, which almost completely blocks material leakage. As a supplementary protection to the labyrinth seal, the contact design under pressure ensures sealing stability, adapts to ultra-high speed rotation and high pressure conditions, and provides a long-lasting and reliable sealing effect.

[0017] As a further optimization of the present invention, a combined sealing structure is also provided in the upper assembly area of ​​the main shaft and the main shaft housing supporting it. The main shaft assembly area is another potential leakage path. The combined sealing structure blocks this channel to prevent materials from entering core components such as the main shaft bearing, thereby avoiding wear and failure. The double combined seal forms a full-process sealing protection, further improving the overall sealing performance of the equipment.

[0018] As a further optimization of the present invention, the combined sealing structure provided at the upper end of the main shaft includes: a labyrinth seal formed on the main shaft by a sealing step or annular protrusion / groove and a corresponding stationary component, and a main shaft mechanical seal assembly located below it.

[0019] The labyrinth seal formed by the sealing steps first blocks the material, and the main shaft mechanical seal assembly provides the final seal. The dual protection is suitable for the high-speed rotation of the main shaft. The structure is compact and does not affect the flexibility of the main shaft operation, while extending the service life of the bearings and sealing components.

[0020] As a further optimization of the present invention, the flow guiding structure is a flow guiding flange fixed below the fixed stationary knife assembly and extending towards the discharge port;

[0021] The guide flange has a simple structure and direct flow guiding effect, which can quickly guide the material away from the sealing and main shaft areas. The extended design expands the flow guiding coverage area, ensuring that the material flows smoothly to the outlet along the preset path, avoiding backflow and accumulation, and is suitable for the rapid discharge of materials after ultra-high speed grinding.

[0022] As a further optimization of the present invention, the guide flange is an annular or split flange;

[0023] The annular flange is compatible with the integrated stationary blade assembly, ensuring full coverage and no dead angles in the flow guidance;

[0024] The split flange is easy to install and maintain, and can be flexibly arranged according to the structure of the stationary blade assembly;

[0025] Two types are available to adapt to different equipment structures, enhancing the versatility and practicality of the flow guiding structure.

[0026] As a further optimization of the present invention, the rotating moving blade assembly includes a central disk and a plurality of moving blades evenly distributed around the circumference, and the fixed stationary blade assembly includes an annular support frame and a plurality of stationary blades distributed in a circumferential array, and the gap between any two adjacent stationary blades constitutes a material outflow channel.

[0027] The circumferentially-distributed moving blade and the static blade form a multi-blade shearing structure, which improves grinding efficiency and uniformity; the material outflow channel is directly connected with the flow guide structure, thereby shortening the material guiding path, reducing the risk of accumulation, and facilitating the replacement and maintenance of the moving blade and the static blade, and reducing the use cost.

[0028] As a further optimized scheme of the present application, the driving device drives the main shaft through a transmission assembly, and an auxiliary system for lubrication and / or cooling is arranged outside the grinding chamber;

[0029] The transmission assembly ensures stable transmission of driving power, adapts to the requirement of super-high-speed rotation, the lubrication system reduces the friction loss of the main shaft and the sealing components, and the cooling system controls the temperature of the grinding chamber and the transmission, thereby avoiding the denaturation of heat-sensitive materials, and both of them improve the operation stability and service life of the equipment.

[0030] In summary, the present application adopts a split modular cutter design and a combined sealing design of 'labyrinth sealing + mechanical sealing', reduces the leakage rate to a very low level, ensures the uniformity of product particle size, actively guides the material outflow through the flow guide structure, completely eliminates the problem of high-temperature pasting caused by accumulation, and reduces the wear of core components through the synergistic effect of double sealing and flow guide, thereby prolonging the service life of the equipment and reducing the maintenance cost.

[0031] The super-high-speed cutting type precision grinder has the following beneficial effects:

[0032] (1) The combined sealing design of 'labyrinth sealing + mechanical sealing' sets up multiple barriers on the key material leakage path, the labyrinth sealing first dissipates the kinetic energy of the material and blocks most of the material, and the mechanical sealing provides the final reliable end face sealing, which reduces the leakage rate to a very low level, effectively prevents the mixing of coarse and fine materials, and ensures the high particle size uniformity and consistency of the grinding product;

[0033] (2) The flow guide structure on the downstream side can timely and smoothly guide the ground material out of the shearing area and make it leave the equipment along the preset path, thereby avoiding the accumulation and stagnation of the material on the static surface such as the bottom of the static blade and the main shaft shell, and fundamentally eliminating the problems of local high temperature and material pasting caused by the friction between the accumulated material and the rotating components;

[0034] (Three) combined seal reduces the opportunity of abrasive material (especially high hardness particles and liquid) into the main shaft chamber and mechanical seal pair, at the same time, the flow guide structure reduces the material retention in the sealing area, reduces the wear and pollution risk of the sealing pair, the two synergies, greatly prolong the service life of the main shaft assembly, mechanical seal and other key components, reduce the maintenance frequency and use cost;

[0035] (Four) through the structure design of split cutter, the actual operation is more simple, can shorten the material shearing path, improve the material shearing and grinding efficiency, so as to expand the capacity, and good health, high durability, convenient maintenance, combined with good sealing and flow guide makes the internal working condition of the equipment more clean, the temperature is more controllable, reduces the accidental shutdown caused by sealing failure, material jam or overheating, improves the stability and reliability of long-term operation of the equipment;

[0036] (Five) enhanced sealing and temperature control capability, so that the device can better handle high viscosity, containing hard particles or more sensitive materials, broaden the application field of the equipment.

[0037] Additional aspects and advantages of the application will be described in part below, some will become apparent from the following description, or will be understood by those skilled in the art through practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 is the first perspective view of the structure of the application;

[0039] Figure 2 is the second perspective view of the structure of the application;

[0040] Figure 3 is the top view of the structure of the application;

[0041] Figure 4 is the bottom view of the structure of the application;

[0042] Figure 5 is the front view of the structure of the application;

[0043] Figure 6 is the cross-sectional structure of the main shaft assembly and the micro cutter assembly of the application; Figure 5

[0044] Figure 7 is the third perspective view of the structure of the application;

[0045] Figure 8 is the enlarged structure of the application at A; Figure 7

[0046] Figure 9 ​​It is a schematic diagram of the sectional view of the main barrel and its internal structure of the application;

[0047] Figure 10 It is a schematic diagram of the sectional view of the main barrel and its internal structure of the application; Figure 9 It is a schematic diagram of the sectional view of the main barrel and its internal structure of the application;

[0048] Figure 11 It is a schematic diagram of the sectional view of the main barrel and its internal structure of the application;

[0049] Figure 12 It is a schematic diagram of the sectional view of the main barrel and its internal structure of the application; Figure 11

[0050] Figure 13 It is a schematic diagram of the sectional view of the main barrel and its internal structure of the application;

[0051] Figure 14 It is a schematic diagram of the sectional view of the main barrel and its internal structure of the application; Figure 13

[0052] BRIEF DESCRIPTION OF DRAWINGS: 1, rack; 2, box; 3, motor; 4, main barrel; 5, protective cover; 6, feed hopper; 7, main shaft assembly; 71, main shaft shell; 72, main shaft drive shaft; 73, inner spacer ring; 74, outer spacer ring; 75, bearing; 76, inclined support; 8, transmission box body; 9, transmission assembly; 91, synchronous pulley; 92, synchronous belt; 10, rotating moving knife assembly; 11, fixed static knife assembly; 111, static knife support top ring; 112, static knife support bottom ring; 113, support column; 114, static knife back wheel; 115, static knife support ring; 116, static knife blade; 117, static knife wear ring; 12, sealing ring; 13, protective net; 14, moving knife petal; 15, micro-cut moving knife mechanical seal assembly; 151, moving knife mechanical seal moving ring; 152, moving knife mechanical seal static ring; 153, moving knife mechanical seal shell; 16, main shaft mechanical seal assembly; 161, main shaft mechanical seal moving ring; 162, main shaft mechanical seal shell; 163, main shaft mechanical seal static ring; 17, flow guide flange; 18, annular protrusion; 19, annular groove; 20, sealing step; 21, oil mist lubricator; 22, electrical control box; 23, static knife flow guide ring; 24, moving knife blade. DETAILED DESCRIPTION

[0053] Embodiments of the application are described below by reference to the accompanying drawings, in which examples of the embodiments are shown in several figures, in which the same or similar symbols throughout the figures denote the same or similar elements or elements having the same or similar functions. The embodiments described below by reference to the accompanying drawings are exemplary only, and are intended to explain the application, but cannot be understood as a limitation of the application.

[0054] ​​In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature is "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in horizontal height than the second feature. The first feature is "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in horizontal height than the second feature.

[0055] Please refer to Figures 1-10 A kind of ultra-high speed cutting type precision grinding machine for food, medicine, chemical field material, including rack 1, the upper end of rack 1 is equipped with box 2, the upper end and side portion of box 2 are equipped with motor 3 and main cylinder 4 respectively, the upper and lower ends of main cylinder 4 are open design, lower end opening is used as discharge port, and upper end opening is equipped with protective cover 5, the upper end opening of protective cover 5 is equipped with feed hopper 6, main shaft assembly 7 is coaxially arranged in the inside of main cylinder 4, transmission box body 8 is installed on the side of box 2 and extends to the inside of main cylinder 4, the lower end of main shaft assembly 7 is supported by transmission box body 8, the input end of main shaft assembly 7 extends into transmission box body 8 and is drivenly connected with the output end of motor 3 extending into box 2 by transmission assembly 9, the upper end of main shaft assembly 7 extends into protective cover 5 and is equipped with micro-cutting tool assembly for shearing and grinding material to be crushed.

[0056] Specifically, main shaft assembly 7 includes main shaft shell 71 fixedly installed on the upper end of transmission box body 8, the inside of main shaft shell 71 is provided with coaxially arranged main shaft drive shaft 72, the two ends of main shaft drive shaft 72 are rotatably connected with the two ends of main shaft shell 71 by a group of bearings 75, and main shaft drive shaft 72 and main shaft shell 71 further have inner spacer ring 73 and outer spacer ring 74 arranged from inside to outside, the lower end of main shaft drive shaft 72 extends into transmission box body 8 and is drivenly connected with the output end of motor 3 by transmission assembly 9.

[0057] As Figure 6 , Figure 8 , Figure 10 and Figure 14As shown, the micro-cutter assembly includes a rotating moving cutter assembly 10 and a fixed static cutter assembly 11, the rotating moving cutter assembly 10 includes a central disc body mounted on the upper end of the main shaft driving shaft 72 and rotates synchronously with it, and the edge of the central disc body is further provided with nine moving cutter petals 14 (the number can also be 3, 4, 6, 9, 12, 16, 18, etc.) uniformly distributed in the circumferential direction, and the end of the moving cutter petals 14 is provided with a moving cutter blade 24, and the fixed static cutter assembly 11 is mounted on the upper end of the main shaft housing 71 and is stationary, and the fixed static cutter assembly 11 is arranged on the periphery of the rotating moving cutter assembly 10, and the inner circle of the fixed static cutter assembly 11 is provided with a plurality of static cutter blades 116 arranged in an array in the circumferential direction, and there is a material flow gap between adjacent two static cutter blades 116, and in working, the rotating moving cutter assembly 10 is driven by the main shaft driving shaft 72 to rotate at high speed, so that the material falling on the central disc body is thrown to the edge area under the action of centrifugal force, and then the material is contacted with the static cutter blade 116, and then the material is stirred by the moving cutter petals 14 and the moving cutter blade 24, so as to realize high-speed shearing and grinding of the material, and the material meeting the standard particle size after grinding will flow outwards through the material flow gap.

[0058] Further, as shown in Figure 10 , the fixed static cutter assembly 11 includes a static cutter support top ring 111, a static cutter support bottom ring 112, a support column 113, a static cutter back wheel 114, a static cutter support ring 115, a static cutter blade 116 and a static cutter wear ring 117, the static cutter support top ring 111 and the static cutter support bottom ring 112 are arranged in an upper and lower distribution and are fixedly connected through the support column 113 between them, the number of the support column 113 is multiple and extends in the circumferential direction, the opposite inner circle of the static cutter support top ring 111 and the static cutter support bottom ring 112 is provided with the static cutter back wheel 114 and the static cutter support ring 115, the two static cutter back wheels 114 are fixedly connected through the connecting rod, the static cutter support ring 115 is located on the inner side of the static cutter back wheel 114, the opposite faces of the two static cutter support rings 115 are provided with clamping grooves for fixing the static cutter blades 116, the upper and lower ends of the static cutter blades 116 are respectively clamped with the two static cutter support rings 115, and the outer side surface of the static cutter blades 116 is in contact with the static cutter back wheel 114, the number of the static cutter wear ring 117 is two, one static cutter wear ring 117 is mounted on the lower end of the adapter ring of the feed hopper 6, and the other static cutter wear ring 117 is mounted on the upper end of the sealing ring 12, the outer circles of the two static cutter wear rings 117 are respectively matched with the inner circles of the static cutter support top ring 111 and the static cutter support bottom ring 112, and the opposite two end faces of the two static cutter wear rings 117 are respectively matched with the upper and lower end faces of the outer circle of the rotating moving cutter assembly 10.

[0059] Further, as shown in Figure 6 , Figure 9 and Figure 10As shown, the inner circular surface of the stationary knife supporting bottom ring 112 is also interference fitted with a sealing ring 12, which is stationary and has its upper end forming a labyrinth seal with the lower end of the outer circle of the rotating moving knife assembly 10, and a micro-cut moving knife mechanical seal assembly 15 is also provided between the sealing ring 12 and the rotating moving knife assembly 10, forming a double seal of labyrinth seal and contact mechanical seal, and the labyrinth seal can be a primary, secondary or multi-stage labyrinth, thereby effectively improving the sealing performance.

[0060] Further, as shown in Figure 6 and Figure 10 , there is an assembly gap between the upper end of the main shaft drive shaft 72 and the upper end of the main shaft housing 71, and a main shaft mechanical seal assembly 16 is installed in the assembly gap, the outer edge of the upper end of the main shaft drive shaft 72 has a downwardly extending sealing step 20, and the sealing step 20 is clearance fitted with the outer upper end of the main shaft mechanical seal assembly 16, forming another labyrinth seal, and the labyrinth seal and the main shaft mechanical seal assembly 16 form a multi-seal to prevent material from flowing into the gap between the main shaft housing 71 and the main shaft drive shaft 72.

[0061] As shown in Figure 10 , in this embodiment, the outer edge of the rotating moving knife assembly 10 has a downwardly extending annular protrusion 18, and the upper end surface of the sealing ring 12 has an annular groove 19 adapted to the annular protrusion 18, the annular protrusion 18 and the annular groove 19 are inserted and have a gap, and the positions of the annular protrusion 18 and the annular groove 19 can be interchanged, the annular protrusion 18 can be provided on the sealing ring 12, and the annular groove 19 can be provided on the rotating moving knife assembly 10, which does not affect the rotating action of the rotating moving knife assembly 10 and can also play a role in labyrinth seal;

[0062] The number of annular protrusions 18 and annular grooves 19 is consistent and can be one, two or more, thereby forming a primary, secondary or multi-stage labyrinth seal, and the specific design can be customized according to actual use.

[0063] As shown in Figure 10As shown, in this embodiment, the micro-cutting tool mechanical seal assembly 15 includes a dynamic ring 151, a static ring 152 and a housing 153. The dynamic ring 151 is sleeved on the outer circle of the lower end of the rotating tool assembly 10 and is assembled by O-ring interference and fixed by bolts, so that the dynamic ring 151 can rotate synchronously with the rotating tool assembly 10. The static ring 152 is sleeved on the outer circle of the upper end of the main shaft driving shaft 72 with a clearance fit. The housing 153 is installed on the inner circle of the lower end of the sealing ring 12 by O-ring interference. The outer circle of the static ring 152 is interference-fitted with the inner circle of the housing 153, and a wave-shaped flat spring is installed between the static ring 152 and the housing 153. The upper end surface of the static ring 152 is in contact with the lower end surface of the dynamic ring 151, thereby forming a contact mechanical seal, which can further prevent the material from flowing downward.

[0064] As shown in the drawings, Figure 10 In this embodiment, the main shaft mechanical seal assembly 16 includes a dynamic ring 161, a housing 162 and a static ring 163. The dynamic ring 161 is sleeved on the outer circle of the upper end of the main shaft driving shaft 72 between the sealing step 20 by O-ring interference. The housing 162 is sleeved on the inner circle of the upper end of the main shaft housing 71 and is fixed by bolts. The upper end of the housing 162 extends to between the sealing step 20 and the dynamic ring 161, and the upper end of the housing 162 is a stepped shape matching the sealing step 20, or is a shape of a ring-shaped protrusion and a ring-shaped groove inserted, thereby forming a labyrinth seal. The static ring 163 is sleeved on the outer circle of the main shaft driving shaft 72 with a clearance fit. The outer circle of the static ring 163 is interference-fitted with the inner circle of the housing 162 by O-ring, and a wave-shaped flat spring is installed between the static ring 163 and the housing 162. The dynamic ring 161 and the static ring 163 are in contact with each other, thereby forming a contact mechanical seal. The main shaft rotating shaft, the dynamic ring 161 and the upper end of the housing 162 are clearance-fitted, thereby forming a labyrinth seal, and do not affect the rotation of the main shaft driving shaft 72. Moreover, the sealing step 20 can also play a role in guiding the flow of the material.

[0065] As shown in the drawings, Figure 6 , Figure 7 , Figure 8 and Figure 10As shown, in this embodiment, the upper end of the outer circle of the main shaft shell 71 also has circumferentially distributed and upwardly extending inclined supports 76, the upper ends of the plurality of inclined supports 76 are flush and a flow guide flange 17 is mounted, the fixed stationary knife assembly 11 is fixed on the flow guide flange 17 by bolts, thereby completing the installation and fixation of the fixed stationary knife assembly 11, the lower end of the flow guide flange 17 extends downwardly for downwardly guiding the material after shearing, avoiding the material flowing along the lower end surface of the fixed stationary knife assembly 11 and the outer wall of the main shaft shell 71;

[0066] As shown in Figure 11 , Figure 12 , Figure 13 and Figure 14 shown, in another embodiment, the inclined supports 76 and the flow guide flange 17 are removed, and a stationary knife flow guide ring 23 is directly installed at the bottom of the fixed stationary knife assembly 11, the lower end of the stationary knife flow guide ring 23 extends axially downwardly and the extension length is greater than that of the flow guide flange 17, which can enhance the flow guiding effect.

[0067] As shown in Figure 5 and Figure 6 shown, in this embodiment, the transmission assembly 9 includes a synchronous pulley 91 and a synchronous belt 92, the number of the synchronous pulleys 91 is two and they are respectively installed at the lower end of the main shaft driving shaft 72 and the output end of the motor 3, the two synchronous pulleys 91 are drivingly connected by the synchronous belt 92, the synchronous pulley 91 and the synchronous belt 92 are 8M or 14M type circular arc tooth synchronous pulley and synchronous belt, and the width of the synchronous belt is reduced, which helps to reduce the noise and vibration during the operation of the equipment.

[0068] As shown in Figures 1-5 and Figure 7 shown, in this embodiment, an oil mist lubricator 21 is also installed at one end side of the box body 2, the oil mist lubricator 21 outputs lubricating oil mist to the box body 2 and the transmission box body 8, which can improve the transmission stability.

[0069] An electrical control box 22 for controlling the start and stop and power of the motor 3 is also installed at the outside of the box body 2.

[0070] As shown in Figure 3 shown, in this embodiment, a protective net 13 is also installed in the upper end opening of the feed hopper 6, which is used for protecting the safety of personnel and preventing sundries from entering, and protecting the safety and normal operation of the equipment.

[0071] As shown in Figure 4 and Figure 5 shown, the bottom of the box body 2 is designed as a hollow, and a heat dissipation fan opposite to the output end of the motor 3 is installed at the bottom of the inner cavity of the box body 2, which can reduce the high temperature in the box body 2 during the operation of the equipment, and also can reduce the transmission temperature of the transmission assembly 9, thereby improving the overall service life.

[0072] In summary, the application blocks leakage from the source by setting a combined seal at the main leakage risk point, and optimizes the material outflow path through a flow guide structure to avoid adverse secondary flow, as follows:

[0073] Upstream non-contact labyrinth seal: an annular protrusion 18 is arranged at the bottom of the outer edge of the rotating cutter assembly 10, and a corresponding annular groove 19 is arranged on the seal ring 12 to form a tortuous gap channel. When the material attempts to leak downward, it needs to change direction multiple times and pass through narrow gaps, and its kinetic energy is greatly dissipated and blocked, achieving a first-stage high-efficiency seal without friction and wear;

[0074] Downstream contact mechanical seal: below the labyrinth seal, a micro-cutting dynamic cutter mechanical seal assembly 15 composed of a dynamic cutter mechanical seal moving ring 151, a dynamic cutter mechanical seal static ring 152, and a dynamic cutter mechanical seal housing 153 is arranged. The moving ring rotates with the dynamic cutter, and the static ring is fixed. The end faces of the two are tightly bonded under the pressure of the spring to form the final dynamic sealing surface, which almost completely blocks the passage of the material;

[0075] Flow guide mechanism:

[0076] In one embodiment, a downwardly extending flow guide flange 17 is installed below the static cutter support bottom ring 112 through an inclined support 76. The flange changes the natural flow direction of the material. The material flowing out through the gap of the static cutter blade 116 first contacts the outer wall of the flow guide flange 17 under the action of gravity and is guided to fall directly downward into the discharge area, without spreading horizontally along the lower surface of the static cutter support bottom ring 112 and the outer wall of the main shaft housing 71 to the dangerous area above the main shaft drive shaft 72;

[0077] In another embodiment, a static cutter flow guide ring 23 is added to the bottom of the fixed static cutter assembly 11. The lower end of the static cutter flow guide ring 23 extends axially downward, changing the natural flow direction of the material to make it fall directly downward, enhancing the flow guide effect.

[0078] In operation, the material falls from the feed hopper 6 into the center of the high-speed rotating rotating cutter assembly 10 and is thrown to the edge under the action of centrifugal force. It undergoes intense shearing and grinding in the narrow gap formed by the dynamic cutter petals 14, the dynamic cutter blades 24, and the static cutter blades 116. The material that meets the fineness requirement passes through the gap of the static cutter blades 116. At this time, the flow guide flange 17 or the static cutter flow guide ring 23 immediately intervenes to guide the main flow of the material to smoothly discharge downward. The material that may attempt to backseep upstream or leak downward first encounters the blockage and dissipation of the labyrinth seal, and even if a very small amount penetrates, it will be completely blocked by the mechanical seal that follows. At the same time, a sealing step 20 labyrinth seal + main shaft mechanical seal assembly 16 combination seal is also used between the upper end of the main shaft drive shaft 72 and the main shaft housing 71 to block another potential leakage path.

[0079] The above merely describes preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art, according to the technical solution and inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. An ultra-high-speed cutting type precision grinder, comprising a frame, a driving device, a grinding chamber provided with an inlet and an outlet, and a rotating moving knife assembly and a fixed static knife assembly arranged in the grinding chamber and driven by a main shaft, characterized in that: a combined sealing structure is arranged at the relative motion interface between the rotating moving knife assembly and the fixed static knife assembly, the combined sealing structure comprising a non-contact labyrinth seal and a contact mechanical seal arranged in sequence along the potential leakage direction of the material; a flow guide structure is arranged at the bottom or downstream side of the fixed static knife assembly, the flow guide structure being capable of guiding the material flowing out of the static knife assembly after grinding towards the outlet and away from the assembly area between the main shaft and the stationary components in the grinding chamber. The non-contact labyrinth seal is formed by mutual embedding of at least one annular protrusion and at least one corresponding annular groove, one of the rotating moving knife assembly and the fixed static knife assembly or the sealing ring fixed thereto being provided with the annular protrusion, and the other being provided with the corresponding annular groove, and there being a running gap between the annular protrusion and the annular groove. The number of the annular protrusions and the annular grooves is multiple, forming a multi-stage labyrinth seal.

2. The ultra-high-speed cutting-type precision lapping machine according to claim 1, wherein The contact mechanical seal comprises a moving knife sealing dynamic ring fixed to the rotating moving knife assembly and rotating therewith, and a moving knife sealing static ring fixed to the fixed static knife assembly or the stationary components of the grinding chamber, the end faces of the moving knife sealing dynamic ring and the moving knife sealing static ring being in contact under pressure.

3. The ultra-high-speed cutting-type precision lapping machine according to claim 2, wherein A combined sealing structure is also arranged at the upper end assembly area of the main shaft and the main shaft housing supporting the same.

4. The ultra-high-speed cutting-type precision lapping machine according to claim 1, wherein The combined sealing structure arranged at the upper end of the main shaft comprises a labyrinth seal formed by a sealing step formed on the main shaft and a corresponding stationary component, and a main shaft mechanical seal assembly located below.

5. The ultra-high-speed cutting-type precision lapping machine according to claim 1, wherein The flow guide structure is a flow guide flange fixed below the fixed static knife assembly and extending towards the outlet.

6. The ultra-high-speed cutting-type precision lapping machine according to claim 5, wherein The flow guide flange is a ring-shaped, profiled or split flange.

7. The ultra-high-speed cutting-type precision lapping machine according to claim 1, wherein The rotating moving knife assembly comprises a central disc body and a plurality of moving knife petals uniformly distributed in the circumferential direction, the fixed static knife assembly comprises an annular support frame and a plurality of static knife blades arranged in an array in the circumferential direction, and the gap between every two adjacent static knife blades constitutes a material outflow channel.

8. The ultra-high-speed cutting-type precision lapping machine according to claim 7, wherein The driving device drives the main shaft through a transmission assembly, and an auxiliary system for lubrication and / or cooling is arranged outside the grinding chamber.

9. The ultra-high-speed cutting-type precision lapping machine according to claim 1, wherein ​ 10. The ultra-high-speed cutting-type precision lapping machine according to any one of claims 1 to 9, characterized by, ​

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