Vertical ultrafine grinder

Abstract

The invention discloses a vertical ultrafine grinder, aiming at solving the technical problems that the productivity of the vertical ultrafine grinder can be improved and the marginal decreasing effect of unit energy consumption can be effectively overcome. Comprising a smashing chamber, a smashing disc located in the smashing chamber, a smashing disc rotation driving mechanism in transmission connection with the smashing disc, a feeding structure, a discharging structure and an air inlet structure, and the feeding structure, the discharging structure and the air inlet structure are communicated with the smashing chamber. The diameter of the smashing disc ranges from 1950 mm to 2050 mm, the edge linear speed ranges from 160 m / s to 170 m / s when the smashing disc works, and the rated power of the smashing disc rotation driving mechanism ranges from 230 kW to 270 kW. And the unit energy consumption rebound trend is successfully improved while the productivity is remarkably improved.

Description

Technical Field

[0001] The present disclosure relates to a vertical ultrafine grinder. Background Art

[0002] A vertical ultrafine grinder (reference: Patent Grant Publication No. CN212348945U) is mainly applied to various large, medium and small feed mills for ultrafine pulverization processing of various coarse powder materials to achieve a finer particle size meeting the required standards. The structure of the vertical ultrafine grinder includes a pulverizing chamber, a pulverizing disk horizontally arranged in the pulverizing chamber, a pulverizing disk rotation driving mechanism in transmission connection with the pulverizing disk (generally speaking, the pulverizing disk rotation driving mechanism includes a pulverizing disk rotation driving shaft assembly and a pulverizing disk rotation driving motor. The pulverizing disk rotation driving shaft assembly is installed on the machine base at the lower part of the pulverizing chamber. The pulverizing disk rotation driving shaft assembly includes a pulverizing disk rotation driving main shaft installed in the upper bearing system and the lower bearing system. The upper end of the pulverizing disk rotation driving main shaft is installed with the pulverizing disk and the lower end is connected to the pulverizing disk rotation driving motor through a belt transmission mechanism), and a feeding structure, a discharging structure and an air inlet structure respectively communicated with the pulverizing chamber. A pulverizing structure is provided between the edge of the pulverizing disk and the area on the inner wall of the pulverizing chamber corresponding to the outer edge (generally including a hammer head arranged at the edge of the pulverizing disk and a gear ring arranged in the area on the inner wall of the pulverizing chamber corresponding to the outer edge). During operation, the pulverizing disk is driven by the pulverizing disk rotation driving mechanism to rotate in the pulverizing chamber, so that the material conveyed to the pulverizing structure through the feeding structure is pulverized by the pulverizing structure. The rotation center line of the pulverizing disk during rotation is vertically arranged. The feeding port of the feeding structure (generally using a screw feeder) is arranged above the pulverizing disk. The air inlet structure is used to introduce an upward flowing air flow into the lower part of the pulverizing chamber. The discharging structure (generally including a material classification mechanism and a discharging chamber) is located at the upper part of the pulverizing chamber and is used to discharge the air flow carrying the pulverized material introduced into the pulverizing chamber from the air inlet structure out of the vertical grinder.

[0003] The working principle of the above-mentioned vertical ultrafine grinder is as follows: A pulverizing disk is arranged in the pulverizing chamber. A plurality of hammer heads are circumferentially and spacedly arranged at the edge of the pulverizing disk. A gear ring is arranged in the radially outer area of the pulverizing disk. The pulverizing disk drives the hammer heads to rotate at a high speed. The material falls downward through the feeding port of the feeding structure between the hammer heads and the gear ring. Thereafter, the material is pulverized under the impact of the high-speed rotating hammer heads and the friction and shearing between the hammer heads and the gear ring. The pulverized material enters the material classification mechanism (generally using a material classification wheel) for classification. The qualified pulverized material is carried by the air flow through the material classification wheel and sent away through the discharging chamber. The unqualified pulverized material falls onto the high-speed rotating pulverizing disk. The material on the pulverizing disk is thrown between the gear ring and the hammer heads under the action of centrifugal force, and is struck by the hammer heads again and undergoes friction and shearing between the hammer heads and the gear ring.

[0004] The maximum production capacity of a vertical ultrafine grinder (the maximum production capacity that a vertical ultrafine grinder can achieve when the grinding disc rotation drive mechanism is at the rated power) and the unit energy consumption (the energy consumed to produce a unit mass of material when reaching the maximum production capacity, usually expressed in kWh / t) are the two core performance indicators of a vertical ultrafine grinder. Among them, there is an obvious positive correlation between the maximum production capacity of a vertical ultrafine grinder and the diameter of its grinding disc. That is, as the diameter of the grinding disc increases, the working area increases in a square relationship, providing a broader working surface for material processing. At the same time, when the diameter of the grinding disc increases, the peripheral linear velocity of the grinding disc increases accordingly, enhancing the impact energy and shear force, and improving the material crushing efficiency. Currently, the diameter limit of the grinding discs of mainstream large vertical ultrafine grinders on the market is 1500 mm. This is mainly because: if the diameter of the grinding disc is further increased, the increase in unit energy consumption tends to level off and shows a marginal diminishing effect.

[0005] Taking several vertical ultrafine grinders manufactured by the applicant as examples, as shown in Table 1, when the diameter of the grinding disc increases from 1300 mm to 1500 mm, the unit energy consumption decreases from 18.9 kWh / t (this value is obtained by dividing 132 kW in Table 1 by 7 (t / h)) to 13.3 kWh / t, and the efficiency is significantly improved. However, when the diameter of the grinding disc continues to increase to 1700 mm, the unit energy consumption rebounds to 14.7 kWh / t, showing a rebound trend after the critical point. The inventor's research found that: the marginal diminishing effect of the unit energy consumption of a vertical ultrafine grinder stems from the interaction of multiple complex factors. As the diameter of the grinding disc continues to increase, the problem of uneven material distribution increases. At the same time, the energy loss of the grinding disc rotation drive mechanism increases non-linearly with the increase in size, and the proportion of bearing friction, gear transmission, and wind resistance loss rises. The inertial mass of the grinding disc increases, and the structural vibration and deformation are more significant, requiring more energy to maintain stability.

[0006] Table 1: Comparison of the main performance of several vertical ultrafine grinders manufactured by the applicant

[0007]

[0008] In addition, there are also problems with the unreasonable design of the feeding structure and the discharging structure of the vertical ultrafine grinder. Specifically, the screw feeder of the feeding structure can only be fixed outside the vertical ultrafine grinder in a fixed form, resulting in users often having to change the on-site layout of their material supply facilities to actively adapt to the position of the screw feeder, which affects the installation convenience of the vertical ultrafine grinder. The discharging structure design does not fully consider the smoothness of material flow, resulting in a large resistance to material flow and easy wear of the internal channels of the discharging structure. Summary of the Invention

[0009] The object of the present disclosure is to provide an improved vertical ultrafine grinder to solve the technical problem of being able to increase the production capacity of the vertical ultrafine grinder while effectively overcoming the marginal diminishing effect of unit energy consumption.

[0010] To this end, a vertical ultrafine grinder is provided, which includes a crushing chamber, a crushing disk located in the crushing chamber, a crushing disk rotation driving mechanism drivingly connected to the crushing disk, and a feeding structure, a discharging structure, and an air inlet structure respectively communicated with the crushing chamber. A crushing structure is provided between the edge of the crushing disk and the area on the inner wall of the crushing chamber corresponding to the outer edge. The crushing structure includes hammers circumferentially and spacedly arranged at the edge of the crushing disk and a toothed ring arranged in the area on the inner wall of the crushing chamber corresponding to the outer edge. A hammer-tooth gap is formed between the hammers and the toothed ring. During operation, the crushing disk is driven by the crushing disk rotation driving mechanism to rotate in the crushing chamber, so that the material conveyed to the crushing structure through the feeding structure is crushed by the crushing structure. The rotation center line of the crushing disk during rotation is vertically arranged. The air inlet structure is used to introduce an upward flowing air flow into the lower part of the crushing chamber. The discharging structure is located in the upper part of the crushing chamber and is used to discharge the air flow carrying the crushed material introduced into the crushing chamber from the air inlet structure out of the vertical ultrafine grinder. Wherein, the diameter of the crushing disk is 1950 mm - 2050 mm and the peripheral linear velocity during operation is 160 m / s - 170 m / s, and the rated power of the crushing disk rotation driving mechanism is 230 kW - 270 kW.

[0011] The above vertical ultrafine grinder has breakthroughly increased the diameter of the crushing disk to the range of 1950 mm - 2050 mm, which is the first time in the field of similar vertical ultrafine grinders. At the same time, by controlling the rotation speed of the crushing disk, the peripheral linear velocity of this ultra-large diameter crushing disk during operation is maintained within the optimized range of 160 m / s - 170 m / s. The rated power of 230 kW - 270 kW ensures an ideal balance point between energy efficiency and production capacity of the vertical ultrafine grinder. Specifically, first, the ultra-large diameter crushing disk provides a significantly enlarged working area (growing according to the square relationship of the crushing disk radius), greatly improving the material handling capacity and the effective crushing area. Secondly, by limiting the peripheral linear velocity within the set range, it not only ensures sufficient impact energy and shear force to maintain efficient crushing, but also avoids the problem of a sharp increase in energy consumption caused by too high a linear velocity. In addition, the rated power range of 230 kW - 270 kW provides a stable and sufficient energy output for the crushing area between the hammers and the toothed ring, ensuring that there is sufficient crushing kinetic energy in the hammer-tooth gap formed between the hammers and the toothed ring. This balanced design enables the equipment to significantly improve the production capacity while successfully improving the trend of unit energy consumption rebound observed in the SWFL170 model, achieving a very small or even zero increase in unit energy consumption (see the experimental examples below).

[0012] The following further describes the present disclosure in conjunction with the accompanying drawings and specific embodiments. The additional aspects and advantages provided by the present disclosure will be given in part in the following description, will become apparent in part from the following description, or will be understood through practice. Description of the Drawings

[0013] The drawings forming a part of this specification are used to assist in the understanding of the present disclosure. The content provided in the drawings and the related descriptions in this specification can be used to explain the present disclosure, but do not constitute an improper limitation of the present disclosure.

[0014] Figure 1 It is an external view of the vertical ultrafine pulverizer according to the first embodiment of the present disclosure.

[0015] Figure 2 is Figure 1 a cross-sectional view of the vertical ultrafine pulverizer shown.

[0016] Figure 3 is Figure 1 a schematic diagram of the hammer head spacing in the vertical ultrafine pulverizer shown.

[0017] Figure 4 is Figure 1 an external view of the feeding structure in the vertical ultrafine pulverizer shown.

[0018] Figure 5 It is the front view of the vertical ultrafine pulverizer according to the second embodiment of the present disclosure.

[0019] Figure 6 is Figure 5 the left view of the vertical ultrafine pulverizer shown.

[0020] Figure 7 is Figure 6 the top view of the vertical ultrafine pulverizer shown.

[0021] Figure 8 is Figure 5 an external view of the feeding structure in the vertical ultrafine pulverizer shown.

[0022] Figure 9 is Figure 5 a cross-sectional view of the feeding structure in the vertical ultrafine pulverizer shown. Detailed Embodiments

[0023] The following clearly and completely describes the present disclosure in conjunction with the accompanying drawings. Those of ordinary skill in the art will be able to implement the present disclosure based on these descriptions. Before describing the present disclosure in conjunction with the accompanying drawings, it is particularly noted that:

[0024] The technical solutions and technical features provided in each part including the following description can be combined with each other without conflict. In addition, where possible, these technical solutions, technical features and related combinations can be given specific technical themes and protected by relevant patents.

[0025] The embodiments of the present disclosure involved in the following description are generally only a part of the embodiments rather than all embodiments. Based on these embodiments, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the scope of patent protection.

[0026] The terms "comprising", "including", "having" and any variations thereof in this specification, the corresponding claims and relevant parts are intended to cover non-exclusive inclusion. Other relevant terms and units can be reasonably interpreted based on the relevant content provided in this specification.

[0027] Figure 1 It is an external view of the vertical ultrafine grinder according to Embodiment 1 of the present disclosure. Figure 2 is Figure 1 a cross-sectional view of the vertical ultrafine grinder shown. Figure 3 is Figure 1 a schematic diagram of the distance between the hammer heads in the vertical ultrafine grinder shown. Figure 4 is Figure 1 an external view of the feeding structure in the vertical ultrafine grinder shown. As Figures 1 - 4 shown, the vertical ultrafine grinder according to Embodiment 1 of the present disclosure includes a crushing chamber 1, a crushing disk rotation driving mechanism 2 drivingly connected to a crushing disk 11 located in the crushing chamber 1, and a feeding structure 3, a discharging structure 4 and an air inlet structure respectively communicated with the crushing chamber 1.

[0028] In the crushing chamber 1, a crushing structure is provided between the edge of the crushing disk 11 and the area on the inner wall of the crushing chamber 1 corresponding to the outer edge. The crushing structure includes hammer heads 12 circumferentially and spacedly arranged at the edge of the crushing disk 11 and a toothed ring 13 arranged in the area on the inner wall of the crushing chamber 1 corresponding to the outer edge. A hammer-tooth gap 14 is formed between the hammer heads 12 and the toothed ring 13 (refer to Figure 3 ). During operation, the crushing disk 11 is driven by the crushing disk rotation driving mechanism 2 to rotate in the crushing chamber 1 so that the material conveyed to the crushing structure through the feeding structure 3 is crushed by the crushing structure. The rotation center line of the crushing disk 11 during rotation is vertically arranged. The distance between adjacent hammer heads (as Figure 3 , the distance between adjacent hammer heads can be represented by the distance D) generally takes any value in the range of 200 mm - 250 mm.

[0029] The crushing disc rotation drive mechanism 2 includes a crushing disc rotation drive shaft assembly 21 and a crushing disc rotation drive motor 22. The crushing disc rotation drive shaft assembly 21 is installed on the machine base at the lower part of the crushing chamber 1. The crushing disc rotation drive shaft assembly 21 includes a crushing disc rotation drive main shaft 211 installed in the upper bearing system 212 and the lower bearing system 213. The upper end of the crushing disc rotation drive main shaft 211 is installed with the crushing disc 11, and the lower end is connected to the crushing disc rotation drive motor 22 through a belt transmission mechanism 23.

[0030] The crushing disc rotation drive mechanism 2 is responsible for driving the crushing disc 11 to rotate at a high speed to achieve material crushing. During operation, the crushing disc rotation drive motor 22 is started, and the power is transmitted to the crushing disc rotation drive main shaft 211 through the belt transmission mechanism 23. The crushing disc rotation drive main shaft 211 is installed in the upper bearing system 212 and the lower bearing system 213 and can rotate at a high speed and stably. The upper end of the crushing disc rotation drive main shaft 211 is connected to the crushing disc 11, thereby driving the crushing disc 11 to rotate at a high speed in the crushing chamber 1, so that a strong mechanical force is formed between the hammers 12 at the edge of the crushing disc 11 and the gear ring 13 on the inner wall of the crushing chamber 1.

[0031] The air inlet structure is used to introduce an upward flowing air flow into the lower part of the crushing chamber. Generally speaking, the air inlet structure includes an external air inlet channel arranged in the machine base at the lower part of the crushing chamber 1. In one implementation, the external air inlet channel can be arranged around the crushing disc rotation drive shaft assembly 21 to cool the crushing disc rotation drive shaft assembly 21 (such as the upper bearing system 212 and the lower bearing system 213) by air.

[0032] Generally speaking, a wind flow cover 15 is provided in the crushing chamber 1. The wind flow cover 15 has a cylindrical side part 151 and a top part 152 located above the side part 151. There is an upper opening of the wind flow cover on the top part, and the lower end of the side part forms a lower opening of the wind flow cover. The side part is installed on the inner wall of the crushing chamber 1 through a support structure and is coaxially arranged with the crushing chamber 1. The upper opening hole of the wind flow cover 15 is located outside the material classification wheel 42, and the lower opening of the wind flow cover is suspended above the crushing disc 11. An internal channel is formed inside the wind flow cover 15, and an external channel is formed between the wind flow cover 15 and the inner wall of the crushing chamber.

[0033] The function of the air flow hood 15 is to construct an air flow channel. It forms an internal channel through the side part 151 and the top part 152, and at the same time forms an external channel between the inner wall of the crushing chamber 1. The upper opening of the air flow hood 15 is located outside the material classification wheel 42, and the lower opening is suspended above the crushing disc 11 and is coaxially installed with the crushing chamber 1. This structural design enables the upward flowing air introduced by the air intake structure to form a reasonable air flow path in the crushing chamber 1, so that the crushed material flows from the external channel to the material classification wheel 42 under the drive of the air flow, and the larger particles intercepted by the material classification wheel 42 pass through the internal channel downward and then return to the crushing structure again.

[0034] The discharging structure 4 is located at the upper part of the crushing chamber 1 and is used to discharge the air flow carrying the crushed material introduced into the crushing chamber 1 from the air intake structure out of the vertical ultrafine mill. Specifically, the discharging structure includes a discharging chamber 41 located at the top of the crushing chamber 1. A material classification wheel 42 is provided between the discharging chamber 41 and the crushing chamber 1. A material classification wheel rotation driving motor 43 is installed at the top of the discharging chamber 41. The output shaft of the material classification wheel rotation driving motor 43 is connected to the material classification wheel 42 through a material classification wheel rotation driving shaft assembly 44 installed in the discharging chamber 41. A discharge port 45 is provided at the side part of the discharging chamber 41.

[0035] When the discharging structure 4 works, the upward air flow introduced from the air intake structure carries the crushed material up to the top of the crushing chamber 1. The material classification wheel 42 is driven by the material classification wheel rotation driving motor 43 to rotate, and the material is classified and screened. The material with qualified fineness passes through the material classification wheel 42 along with the air flow and enters the discharging chamber 41, and finally is discharged from the discharge port 45; while the material with unqualified particle size is blocked by the material classification wheel 42 and falls back into the crushing chamber 1 to continue crushing.

[0036] The feeding structure 3 is used to quantitatively convey the material into the crushing chamber 1. The feeding structure 3 includes a feeding pipe 31, a screw feeder 32, a motor 33, and a transmission mechanism 34. The motor 33 is installed on the shell of the crushing chamber 1 through a bracket 35 and is in transmission connection with the rotating shaft in the screw feeder 32 through the transmission mechanism 34. The feeding pipe 31 is arranged outside the crushing chamber 1. The top of the feeding pipe 31 is connected to the screw feeder 32. The side part or the bottom of the feeding pipe is butted against the feeding port on the side wall of the crushing chamber 1. The whole feeding structure 3 is fixed as a whole and is carried and installed on the shell of the crushing chamber 1 through the bracket 35.

[0037] When the feeding structure 3 is working, materials are put into the feeding port of the screw feeder 32. The motor 33 drives the rotation of the rotating shaft in the screw feeder 32 through the transmission mechanism 34, so that the spiral blades in the screw feeder push the materials along the screw feeder 32, and then enter the feeding pipe 31. Finally, the materials are conveyed to the crushing structure in the crushing chamber 1 through the docking part on the side or bottom of the feeding pipe 31 and the feeding port on the side wall of the crushing chamber 1, ensuring that the materials enter the crushing area smoothly and continuously for crushing processing.

[0038] In the vertical ultrafine mill of the first embodiment of the present disclosure, the diameter of the crushing disc 11 is 2000 mm and the peripheral linear velocity during operation is 165 m / s. The working process of the vertical ultrafine mill is as follows: When the vertical ultrafine mill is just started, it is in an unloaded state. The crushing disc rotation driving motor 22 only needs to overcome the inertial resistance of the crushing disc 11 and the crushing disc rotation driving mechanism 2, and the current remains at the unloaded level. When the materials start to be conveyed to the crushing chamber 1 through the feeding structure 3, the crushing action between the hammer heads 12 and the gear ring 13 exerts impact and shear forces on the materials, and the load of the vertical ultrafine mill increases accordingly. The current of the crushing disc rotation driving motor 22 gradually rises, but the control system will keep the rotation speed of the crushing disc 11 constant through frequency adjustment to ensure that the peripheral linear velocity of the crushing disc 11 is stable at 165 m / s. As the feeding amount continues to increase, the current of the crushing disc rotation driving motor 22 continues to climb until it reaches the current value corresponding to the rated power of 250 kW of the crushing disc rotation driving motor 22. At this time, the control system limits the feeding rate at this level to prevent the vertical ultrafine mill from being overloaded. In this rated power state, the rotation speed of the crushing disc 11 still remains stable, and the peripheral linear velocity is maintained at 165 m / s, reaching the maximum production capacity of the equipment.

[0039] In the vertical ultrafine mill of the first embodiment of the present disclosure, the upper bearing system 212 adopts deep groove ball bearings with specifications of 6234 or 6334, and the lower bearing system 213 adopts deep groove ball bearings with specifications of 6234 or 6232 or 6334 or 6332.

[0040] Among the 6234 / 6334 deep groove ball bearings selected for the upper bearing system 212, the 6234 specification has an inner diameter of 170 mm, an outer diameter of 310 mm, and a width of 52 mm, belonging to the narrow series design; the 6334 specification has the same inner diameter of 170 mm but the outer diameter is increased to 360 mm and the width is increased to 72 mm, belonging to the medium width series; among the specifications that the lower bearing system 213 can choose, the 6232 bearing has an inner diameter of 160 mm, an outer diameter of 290 mm, and a width of 48 mm; the 6332 bearing has the same inner diameter of 160 mm but the outer diameter is 340 mm and the width is 68 mm.

[0041] The deep groove ball bearings of 6234 / 6232 / 6334 / 6332 used in the vertical ultrafine mill of Embodiment 1 of the present disclosure exhibit significant economic advantages. Generally speaking, larger-sized bearings are often used for the above-mentioned vertical ultrafine mill. These deep groove ball bearings with an inner diameter of 170 mm are smaller in volume, lighter in weight, and the procurement cost is significantly reduced; moreover, the sizes of the bearing seats and related support structures are correspondingly reduced, further saving material costs; at the same time, the starting torque of the small-sized bearings is small, reducing the operating energy consumption; when maintaining and replacing, these standardized bearings are abundantly supplied in the market and the prices are reasonable, reducing the downtime maintenance cost. It is particularly worth noting that these relatively economical bearings can meet the usage requirements of the above-mentioned vertical ultrafine mill (mainly because the peripheral linear velocity of the crushing disc 11 during operation is not high and the rated power growth of the crushing disc rotation drive motor is not significant either), thus achieving a balance between cost control and equipment performance.

[0042] Based on the vertical ultrafine mill of Embodiment 1 of the present disclosure, the diameter of the crushing disc 11 can be reasonably extended from 2000 mm to 1950 mm - 2050 mm. Such a small change will not change the basic working principle and performance characteristics of the equipment.

[0043] The vertical ultrafine mill of Embodiment 1 of the present disclosure is used to conduct crushing experiments on fish feed raw materials. The fish feed raw materials include fish meal (30 wt% - 40 wt%), soybean meal (15 wt% - 25 wt%), wheat flour or corn flour (20 wt% - 30 wt%), fish oil (5 wt% - 10%), and conventional fish feed additives (3 wt% - 5 wt%). The fish feed raw materials with the same formula are used in each experiment. The hammer tooth gap 14 is taken as the conventional 5 mm in each experiment, and the distance between adjacent hammer heads is taken as 217 mm. In different experiments, the peripheral linear velocity of the crushing disc during operation and the rated power of the crushing disc rotation drive mechanism are adjusted, and then the maximum production capacity, unit energy consumption are calculated and the operation conditions of the bearings are detected. Finally, a comprehensive score is given to each experimental example. Fixed factors: the diameter of the crushing disc is 2000 mm; variable factors: the peripheral linear velocity (m / s), taking five levels of 155, 160, 165, 170, 175; the rated power (kW), taking five levels of 210, 230, 250, 270, 290. The experimental conditions and comprehensive scores of each experimental example are shown in Table 2. The analysis of the effect of the peripheral linear velocity (fixed power 250 kW) is shown in Table 3. The analysis of the effect of the power (fixed peripheral linear velocity 165 m / s) is shown in Table 4.

[0044] The comprehensive scoring method is based on a multi-parameter weighted evaluation system, which divides the performance indicators of vertical ultrafine pulverizers into four key dimensions: output (accounting for 30%) reflects production efficiency, unit energy efficiency (accounting for 20%) reflects economy, bearing temperature rise (accounting for 40%) evaluates reliability and safety, and bearing life prediction (accounting for 10%) considers the long-term use value of the equipment. After normalization, each indicator is superimposed by weight to form an evaluation system of 0-100 points, which fully reflects the comprehensive balance between production efficiency, economy and reliability of the equipment, and especially emphasizes the decisive influence of the bearing system as a key component on the performance of the whole machine. Among them, the bearing temperature rise refers to the increase in the temperature of the bearing under working conditions relative to the ambient temperature, in degrees Celsius.

[0045] Table 2: Experimental conditions and comprehensive scores for each experimental case

[0046]

[0047]

[0048] Table 3: Edge Line Speed ​​Effect Analysis (Fixed Power 250kW)

[0049]

[0050] Table 4: Power effect analysis (fixed edge line speed 165m / s)

[0051]

[0052] The above experimental results show that:

[0053] 1) Critical transition of linear speed: When the linear speed of the edge of the crushing disk increases from 155m / s to 160m / s, the score jumps from 81 points to 94 points, an increase of 16.0%, indicating that 160m / s is the clear lower limit of the performance leap; when the linear speed of the edge of the crushing disk increases from 170m / s to 175m / s, the score drops sharply from 93 points to 82 points, a decrease of 11.8%, indicating that 170m / s is the clear upper limit of safety performance.

[0054] 2) Power critical transition: From 210kW to 230kW, the score increased from 84 points to 92 points, an increase of 9.5%, indicating that 230kW is the lower limit for effectively utilizing the equipment capacity; from 270kW to 290kW, the score decreased from 94 points to 87 points, a decrease of 7.4%, indicating that 270kW is the upper limit for economical and efficient operation.

[0055] 3) High-performance platform within parameter range: The average score of the test points (7 - 9, 12 - 14, 17 - 19) within the wire speed range of 160 - 170 m / s and the power range of 230 - 270 kW reaches 93.1 points; the average score of the test points outside the range is only 80.2 points, with a gap as high as 12.9 points, demonstrating the outstanding advantages within the parameter range.

[0056] In summary, the experimental examples demonstrate the significant performance advantages within the parameter range of "crushing disc diameter 1950 mm - 2050 mm, peripheral line speed 160 m / s - 170 m / s, rated power 230 kW - 270 kW", verifying that this parameter range is not randomly selected, but the optimal configuration interval based on the physical characteristics of the equipment and engineering practice. It is particularly suitable for the design of a vertical ultrafine mill where the upper bearing system 212 uses deep groove ball bearings with specifications of 6234 or 6334, and the lower bearing system 213 uses deep groove ball bearings with specifications of 6234 or 6232 or 6334 or 6332.

[0057] In addition, the vertical ultrafine mill of Embodiment 1 of the present disclosure also improves the discharge structure 4. As Figures 1 - 2 shown, the discharge chamber 41 is specifically a conical chamber with the small end facing upward, and the discharge port 45 has a diversion channel arranged obliquely upward (i.e., Figure 2 the obliquely upward channel where the discharge port 45 is located), and the top surface of the conical chamber intersects with the top surface of the diversion channel to form an unobstructed transition area.

[0058] By innovatively designing the discharge chamber 41 as a conical chamber with the small end facing upward, the above vertical ultrafine mill changes the hydrodynamic characteristics of the traditional discharge structure, effectively eliminating the flow dead zones and stagnation points that are likely to form in the top area of the discharge chamber 41. This conical structure enables the crushed materials carried by the airflow to form a uniformly contracting path during the vertical flow process, reducing the generation of eddy currents and reverse airflow. Further, the diversion channel of the discharge port 45 is arranged at an obliquely upward angle and precisely intersects with the top surface of the conical chamber to form an unobstructed transition area. This design detail ensures the continuity and stability of the material flow. After being carried by the airflow into the conical chamber, the ultrafine crushed materials can follow the shortest resistance path, smoothly turn along the natural curvature of the inner wall of the chamber and flow through the diversion channel into the pipeline above the vertical ultrafine mill (and then be transported to the material collection system through this pipeline), which not only improves the material transportation efficiency but also reduces the wear caused by the high-speed impact of the materials inside the discharge structure.

[0059] Generally, the included angle between the diversion direction of the diversion channel and the horizontal plane is 140° - 170°. More specifically, the included angle between the diversion direction of the diversion channel and the horizontal plane is 150° - 160°.

[0060] Generally speaking, the discharge chamber 41 is a conical chamber. Optionally, the included angle between the conical generatrix and the axis of the conical chamber is 20° - 40°. More specifically, the included angle between the conical generatrix and the axis of the conical chamber is 25° - 35°.

[0061] As mentioned above, an air flow cover 15 is provided in the crushing chamber 1. The air flow cover 15 has a cylindrical side portion 151 and a top portion 152 located above the side portion 151. An upper opening of the air flow cover is provided on the top portion, and a lower opening of the air flow cover is formed at the lower end of the side portion. The side portion is installed on the inner wall of the crushing chamber 1 through a support structure and is coaxially arranged with the crushing chamber 1. The upper opening hole of the air flow cover 15 is located outside the material classification wheel 42, and the lower opening of the air flow cover is suspended above the crushing disc 11. An internal channel is formed inside the air flow cover 15, and an external channel is formed between the air flow cover 15 and the inner wall of the crushing chamber.

[0062] On this basis, in an optional embodiment, the upper surface of the top portion of the air flow cover 15 is a plane with an included angle within ±10° with the flow guiding direction of the flow guiding channel. This geometric configuration enables the air flow and the material flowing from the material classification wheel 42 into the discharge chamber 41 to flow into the flow guiding channel with a shorter distance and more smoothly, reducing the eddy current and resistance loss caused by the sudden change of the air flow direction, and contributing to improving the efficiency and stability of the vertical ultrafine mill during the material output process.

[0063] In addition, the cross section of the flow guiding channel is rectangular, and the difference between the inner edge width of the flow guiding channel and the inner edge width of the upper end of the discharge chamber 41 is 0 mm - 50 mm. When the discharge chamber is a conical chamber, the inner edge width of the upper end of the discharge chamber refers to the inner edge diameter of the upper end of the discharge chamber. This size configuration ensures that the flow conversion from the conical chamber with the small end upward to the flow guiding channel has the smallest cross-sectional change, reducing the pressure fluctuation and eddy current formation caused by the sudden expansion or contraction of the cross section.

[0064] Figure 5 This is the front view of the vertical ultrafine mill according to the second embodiment of the present disclosure. Figure 6 For Figure 5 This is the left view of the shown vertical ultrafine mill. Figure 7 For Figure 6 This is the top view of the shown vertical ultrafine mill. Figure 8 For Figure 5 This is the external view of the feeding structure in the shown vertical ultrafine mill. Figure 9 For Figure 5 This is the cross-sectional view of the feeding structure in the shown vertical ultrafine mill. As Figures 5 - 9 As shown, the feeding structure 3 in the vertical ultrafine mill according to the second embodiment of the present disclosure has been improved for the vertical ultrafine mill according to the second embodiment of the present disclosure.

[0065] As Figures 5 - 9As shown, the feeding structure of the vertical ultrafine pulverizer of the second embodiment of the present disclosure includes a feeding pipe 31, a screw feeder 32 and a reduction motor 36, the reduction motor 36 is mounted on the shell of the screw feeder 32 and is directly connected to the rotating shaft in the screw feeder 32 to form a screw feeder assembly, the feeding pipe 31 is arranged on the outside of the pulverizing chamber 1, the top of the feeding pipe 31 is provided with a screw feeder assembly mounting interface, the side or bottom of the feeding pipe 31 is provided with a pulverizing chamber docking interface, the screw feeder mounting interface is horizontally arranged, the screw feeder assembly as a whole can be installed and supported on the screw feeder mounting interface at different rotation angles based on the central axis A of the screw feeder mounting interface as the rotation axis, the screw feeder 32 is connected to the feeding pipe 31 through the screw feeder mounting interface, and the pulverizing chamber docking interface can support the feeding pipe 31 and the screw feeder assembly located on the feeding pipe 31 after docking connection with the feeding port on the side wall of the pulverizing chamber.

[0066] The above-mentioned vertical superfine pulverizer solves the technical problem that the feeding structure of the vertical superfine pulverizer of the first embodiment can only be fixed on the outside of the vertical superfine pulverizer in a given form by innovatively designing the feeding structure. The core improvement is that the feeding pipe 31 is designed as an independent component, and a horizontally arranged screw feeder assembly mounting interface is configured on the top, so that the screw feeder assembly (composed of a reduction motor 36 directly connected to the rotating shaft in the screw feeder 32) can be flexibly installed and supported at different rotation angles on the basis of the central axis A of the screw feeder assembly mounting interface as the rotating axis, and at the same time, the side or bottom of the feeding pipe 31 is provided with a grinding chamber docking interface docking with the feeding port of the side wall of the grinding chamber 1, which can support the entire feeding pipe 1 and the screw feeder assembly. This design significantly improves the installation adaptability of the vertical superfine pulverizer, so that the user no longer needs to change the on-site layout of its material supply facilities to adapt to the fixed screw feeder position, but can flexibly adjust the direction of the screw feeder assembly according to the existing layout of the factory, greatly improving the installation convenience and on-site adaptability of the equipment, and providing users with a more flexible and convenient material transportation solution.

[0067] Specifically, the feed pipe 31 is vertically arranged, the grinding chamber docking interface is arranged on the side of the feed pipe 31, and an air inlet 311 is opened on the tube wall of the feed pipe 31 on the opposite side of the grinding chamber docking interface. A sieve plate 312 is also arranged above the grinding chamber docking interface in the feed pipe 31. The sieve plate 312 is installed obliquely and a gap is formed between the edge of the lower side and the tube wall of the grinding chamber 1 for the material that does not pass through the sieve holes of the sieve plate 312 to fall downward and pass through the air inlet 311 area.

[0068] This layout enables the material entering the feed pipe 31 to be first screened by the sieve plate 312. Qualified particles directly pass through the sieve holes and are driven into the crushing chamber 1 by the airflow introduced through the air inlet 311, while oversized particles slide down along the inclined surface of the sieve plate 312 and fall downward through the gap between the lower side of the sieve plate and the pipe wall. This not only avoids oversized materials directly entering the crushing structure and causing blockage or damage but also uses the airflow introduced through the air inlet 311 to assist in screening the material (the combined action of the airflow and the sieve plate 312), improving the feeding efficiency and safety of the entire vertical ultrafine mill.

[0069] In an alternative embodiment, the installation interface of the screw feeder is docked with the screw feeder assembly using a flange docking structure. In this flange docking structure, each bolt connection member along the circumference around the installation interface of the screw feeder is a bolt connection member of the same specification, thereby allowing the entire screw feeder assembly to be installed on the installation interface of the screw feeder at different rotation angles based on the central axis of the installation interface of the screw feeder as the rotation axis.

[0070] By using a flange docking structure at the installation interface of the screw feeder and ensuring that all bolt connection members along the circumference around the interface have the same specification, the screw feeder assembly can be installed on the interface at any angle with the central axis A of the installation interface of the screw feeder as the rotation axis. This allows users to flexibly adjust the direction of the screw feeder assembly according to the existing layout requirements of the factory without changing the layout of the on-site material supply facilities, significantly improving the installation convenience, adaptability, and operation flexibility of the equipment, and providing a more convenient material conveying solution for users.

[0071] If it is assumed that when the central axis of the screw shaft of the screw feeder 32 is perpendicular to both the rotation axis and the central axis of the crushing chamber docking interface and the rotation axis is perpendicular to the central axis of the crushing chamber docking interface, the screw feeder assembly is in the position where the rotation angle is 0° (refer to Figure 7 the state shown), then the screw feeder assembly can be installed on the installation interface of the screw feeder at multiple rotation angles within 0° - 180° that can ensure that the screw feeder assembly does not interfere with other structures of the vertical ultrafine mill.

[0072] The above explains the relevant content of the present disclosure. Those of ordinary skill in the art will be able to implement the present disclosure based on these explanations. Based on the above content of this specification, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of the present disclosure.

Claims

1. A vertical superfine pulverizer, comprising a pulverizing chamber, a pulverizing disc located in the pulverizing chamber, a pulverizing disc rotating drive mechanism connected to the pulverizing disc, and a feeding structure, a discharging structure and an air intake structure respectively connected to the pulverizing chamber, a pulverizing structure is arranged between the edge of the pulverizing disc and the area on the inner wall of the pulverizing chamber corresponding to the outer edge, the pulverizing structure comprises hammers arranged at circumferential intervals at the edge of the pulverizing disc and a gear ring arranged in the area on the inner wall of the pulverizing chamber corresponding to the outer edge, a hammer tooth gap formed between the hammers and the gear ring, when working, the pulverizing disc is driven to rotate in the pulverizing chamber by the pulverizing disc rotating drive mechanism, so that the material transported to the pulverizing structure by the feeding structure is pulverized by the pulverizing structure, the rotation center line of the pulverizing disc is arranged vertically when rotating, the air intake structure is used to introduce an upward airflow into the lower part of the pulverizing chamber, the discharging structure is located at the upper part of the pulverizing chamber and is used to discharge the pulverized material from the airflow introduced into the pulverizing chamber from the air intake structure. The vertical superfine pulverizer is characterized in that: The diameter of the pulverizing disk is 1950 mm-2050 mm and the edge linear speed during operation is 160 m / s-170 m / s. The rated power of the pulverizing disk rotation drive mechanism is 230 kW-270 kW.

2. The vertical superfine pulverizer according to claim 1, characterized in that: The pulverizing disc rotation drive mechanism includes a pulverizing disc rotation drive shaft assembly and a pulverizing disc rotation drive motor. The pulverizing disc rotation drive shaft assembly is installed on a machine base at the lower part of the pulverizing chamber. The pulverizing disc rotation drive shaft assembly includes a pulverizing disc rotation drive main shaft installed in an upper bearing system and a lower bearing system. The upper end of the pulverizing disc rotation drive main shaft is installed with a pulverizing disc and the lower end is connected to the pulverizing disc rotation drive motor through a belt transmission mechanism. The rated power of the pulverizing disc rotation drive mechanism refers to the rated power of the pulverizing disc rotation drive motor.

3. The vertical superfine pulverizer according to claim 2, characterized in that: The rated power of the pulverizing disc rotation driving motor is 250 kW.

4. The vertical superfine pulverizer according to claim 2, characterized in that: The upper bearing system adopts a deep groove ball bearing with a specification of 6234 or 6334, and the lower bearing system adopts a deep groove ball bearing with a specification of 6234 or 6232 or 6334 or 6332.

5. The vertical superfine pulverizer according to claim 1, characterized in that: The diameter of the pulverizing disk is 2000 mm; and / or, the spacing between adjacent hammer heads is 200 mm-250 mm; and / or, the edge linear speed of the pulverizing disk is 165 m / s when it is working.

6. The vertical superfine pulverizer according to claim 1, characterized in that: The discharging structure includes a discharging chamber located at the top of the crushing chamber, a material classifying wheel is arranged between the discharging chamber and the crushing chamber, a material classifying wheel rotation driving motor is installed on the top of the discharging chamber, the output shaft of the material classifying wheel rotation driving motor is connected to the material classifying wheel through a material classifying wheel rotation driving shaft assembly installed in the discharging chamber, a discharging port is arranged on the side of the discharging chamber, the discharging chamber is a conical cabin with a small end facing upward, the discharging port has a guide channel arranged obliquely upward, and the top surface of the conical cabin intersects with the top surface of the guide channel to form an unobstructed transition area.

7. The vertical superfine pulverizer according to claim 6, characterized in that: The angle between the diversion direction of the diversion channel and the horizontal plane is 140°-170°.

8. The vertical superfine pulverizer according to claim 6, characterized in that: The discharging chamber is a conical chamber.

9. The vertical superfine pulverizer according to claim 8, characterized in that: The angle between the cone generatrix of the conical cabin and the axis is 20°-40°.

10. The vertical superfine pulverizer according to claim 1, characterized in that: The feeding structure includes a feeding pipe, a screw feeder and a reduction motor, wherein the reduction motor is mounted on the shell of the screw feeder and is directly connected to the rotating shaft in the screw feeder to form a screw feeder assembly. The feeding pipe is arranged on the outside of the crushing chamber, and a screw feeder assembly mounting interface is provided on the top of the feeding pipe, and a crushing chamber docking interface is provided on the side or bottom of the feeding pipe. The screw feeder mounting interface is arranged horizontally, and the screw feeder assembly as a whole can be installed and supported on the screw feeder mounting interface at different rotation angles based on the central axis of the screw feeder mounting interface as the rotation axis. The screw feeder is communicated with the feeding pipe through the screw feeder mounting interface, and the crushing chamber docking interface can support the feeding pipe and the screw feeder assembly located on the feeding pipe after being docked and connected with the feeding port on the side wall of the crushing chamber.

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