Vertical ultrafine grinder

Abstract

The utility model discloses a vertical ultrafine grinder, aiming at solving the technical problem that a feeding structure can only be fixed outside the vertical ultrafine grinder in a set form. Comprising a crushing chamber, a crushing disc located in the crushing chamber, a crushing disc rotation driving mechanism in transmission connection with the crushing disc and a feeding structure communicated with the crushing chamber, and the feeding structure comprises a feeding pipe, a spiral feeder and a gear motor. The speed reducing motor is mounted on a shell of the spiral feeder and is directly in transmission connection with a rotating shaft in the spiral feeder to form a spiral feeder assembly, a spiral feeder assembly mounting interface is formed in the top of the feeding pipe, a crushing chamber butt joint interface is formed in the side part or the bottom of the feeding pipe, the spiral feeder mounting interface is horizontally arranged, and a crushing chamber butt joint interface is formed in the crushing chamber butt joint interface. The whole screw feeder assembly can be installed and supported on the screw feeder installation connector at different rotation angles on the basis that the central axis of the screw feeder installation connector serves as a rotating shaft.

Description

Technical Field

[0001] This disclosure relates to a vertical ultrafine pulverizer. Background Technology

[0002] The vertical ultrafine pulverizer (reference: patent authorization announcement number CN212348945U) is mainly used in various large, medium and small feed mills for ultrafine pulverization of various coarse powder materials to achieve the required fine particle size. The structure of the vertical ultrafine pulverizer includes a pulverizing chamber, a horizontally arranged pulverizing disc within the pulverizing chamber, a pulverizing disc rotation drive mechanism connected to the pulverizing disc (typically, 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 mounted on a base at the lower part of the pulverizing chamber; this assembly includes a pulverizing disc rotation drive main shaft mounted in an upper bearing system and a lower bearing system; the upper end of the pulverizing disc is mounted on the main shaft, and the lower end is connected to the pulverizing disc rotation drive motor via a belt drive mechanism), and feeding, discharging and air intake structures respectively connected to the pulverizing chamber. A space is provided between the edge of the pulverizing disc and the area on the inner wall of the pulverizing chamber corresponding to the outer edge. The crushing structure (typically including hammers located at the edge of the crushing disc and toothed rings located in the area corresponding to the outer edge on the inner wall of the crushing chamber) rotates the crushing disc in the crushing chamber during operation, driven by a crushing disc rotation drive mechanism. This allows the material fed to the crushing structure via the feeding structure to be crushed by the crushing structure. The rotation center line of the crushing disc is vertically arranged. The feed inlet of the feeding structure (typically a screw feeder) is located above the crushing disc. The air intake structure is used to introduce upward airflow into the lower part of the crushing chamber. The discharge structure (typically including a material classification mechanism and a discharge chamber) is located in the upper part of the crushing chamber and is used to discharge the crushed material from the vertical crusher by the airflow introduced into the crushing chamber from the air intake structure.

[0003] The working principle of the above-mentioned vertical ultrafine pulverizer is as follows: A pulverizing disc is set in the pulverizing chamber, and multiple hammers are arranged circumferentially around the edge of the pulverizing disc. A toothed ring is provided in the radial outer area of ​​the pulverizing disc. The pulverizing disc drives the hammers to rotate at high speed. The material falls downward through the feed inlet of the feeding structure between the hammers and the toothed ring. Thereafter, the material is pulverized by the impact of the high-speed hammers and the friction and shearing action between the hammers and the toothed ring. The pulverized material enters the material classification mechanism (usually a material classification wheel) for classification. The qualified pulverized material is carried away by the airflow through the material classification wheel and sent out through the discharge chamber. The unqualified pulverized material falls onto the high-speed rotating pulverizing disc. The material on the pulverizing disc is thrown between the toothed ring and the hammers by the centrifugal force, and is hit by the hammers again and rubbed and sheared between the hammers and the toothed ring.

[0004] The maximum capacity (the maximum capacity that the vertical ultrafine pulverizer can achieve under rated power) and unit energy consumption (the energy consumed to produce a unit mass of material when reaching maximum capacity, usually expressed in kWh / t) are the two core performance indicators of a vertical ultrafine pulverizer. Among these, there is a clear positive correlation between the maximum capacity of a vertical ultrafine pulverizer and the diameter of its pulverizing disc; that is, as the disc diameter increases, the working area increases quadratically, providing a wider surface area for material processing. Simultaneously, the increased disc diameter leads to a corresponding increase in the linear velocity at the outer edge of the disc, enhancing impact energy and shear force, thus improving material pulverization efficiency. Currently, the disc diameter of mainstream large vertical ultrafine pulverizers on the market is limited to 1500mm. This is mainly because if the disc diameter is further increased, the increase in unit energy consumption tends to level off, exhibiting a diminishing marginal effect.

[0005] Taking several vertical ultrafine pulverizers manufactured by the applicant as examples, according to Table 1, when the diameter of the pulverizing disc increases from 1300mm to 1500mm, the unit energy consumption decreases from 18.9kWh / t (this value is obtained by dividing 132kW by 7 (t / h) in Table 1) to 13.3kWh / t, and the efficiency is significantly improved; however, when the diameter of the pulverizing disc continues to increase to 1700mm, the unit energy consumption rebounds to 14.7kWh / t, showing a rebound trend after the critical point. The inventors' research found that the marginal decrease in unit energy consumption of the vertical ultrafine pulverizer stems from the interaction of multiple complex factors: as the diameter of the pulverizing disc continues to increase, the problem of uneven material distribution increases; at the same time, the energy loss of the pulverizing disc rotation drive mechanism increases nonlinearly with the increase of size, and the proportion of bearing friction, gear transmission and wind resistance loss increases; the inertial mass of the pulverizing disc increases, the structural vibration and deformation are more significant, and more energy is required to maintain stability.

[0006] Table 1: Comparison of Main Performance of Several Vertical Ultrafine Pulverizers Manufactured by the Applicant

[0007]

[0008] Furthermore, vertical ultrafine pulverizers also suffer from unreasonable designs in their feeding and discharging structures. Specifically, the screw feeder in the feeding structure can only be fixed to the outside of the vertical ultrafine pulverizer in a predetermined form, forcing users to often alter the on-site layout of their material supply facilities to accommodate the screw feeder's position, thus affecting the ease of installation. On the other hand, the discharging structure design does not adequately consider the smoothness of material flow, resulting in significant material flow resistance and easy wear of the internal channels. Summary of the Invention

[0009] The purpose of this disclosure is to provide an improved vertical ultrafine pulverizer to solve the technical problem that the feeding structure can only be fixed to the outside of the vertical ultrafine pulverizer in a predetermined form.

[0010] To address this, a vertical ultrafine pulverizer is provided, comprising a pulverizing chamber, a pulverizing disc located within the pulverizing chamber, a pulverizing disc rotation 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 provided between the edge of the pulverizing disc and a region on the inner wall of the pulverizing chamber corresponding to the outer edge. The pulverizing structure includes hammers circumferentially spaced at the edge of the pulverizing disc and a toothed ring disposed on the inner wall of the pulverizing chamber corresponding to the outer edge, with a gap between the hammers and the toothed ring. During operation, the pulverizing disc is driven to rotate within the pulverizing chamber by the pulverizing disc rotation drive mechanism, so that the material fed to the pulverizing structure by the feeding structure is pulverized by the pulverizing structure. The rotation centerline of the pulverizing disc is vertically aligned during rotation. The air intake structure introduces an upward-flowing airflow into the lower part of the pulverizing chamber. The discharging structure is located at the upper part of the pulverizing chamber. The feeding structure is used to carry the pulverized material out of the vertical ultrafine pulverizer by the airflow introduced into the pulverizing chamber from the air intake structure. The feeding structure includes a feeding pipe, a screw feeder, and a geared motor. The geared motor is installed on the housing 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 located on the outside of the pulverizing chamber. The top of the feeding pipe has a screw feeder assembly mounting interface, and the side or bottom of the feeding pipe has a pulverizing chamber docking interface. The screw feeder mounting interface is horizontally set. The screw feeder assembly 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 connected to the feeding pipe through the screw feeder mounting interface. After the pulverizing chamber docking interface is connected to the feed port on the side wall of the pulverizing chamber, it can support the feeding pipe and the screw feeder assembly located on the feeding pipe.

[0011] The aforementioned vertical ultrafine pulverizer, through its innovative feeding structure design, successfully solves the technical problem that traditional vertical ultrafine pulverizers can only have their feeding structures fixed to the outside of the pulverizer in a fixed form. Its core improvement lies in designing the feeding pipe as an independent component, with a horizontally positioned screw feeder assembly mounting interface at the top. This allows the screw feeder assembly (composed of a geared motor directly connected to the rotating shaft within the screw feeder) to be flexibly installed and supported at different rotation angles, with the central axis of this mounting interface as its rotation axis. Simultaneously, the side or bottom of the feeding pipe has a pulverizing chamber docking interface that connects to the feeding port on the side wall of the pulverizing chamber, supporting the entire feeding pipe and screw feeder assembly. This design significantly improves the installation adaptability of the vertical ultrafine pulverizer, eliminating the need for users to alter the site layout of their material supply facilities to accommodate a fixed screw feeder position. Instead, users can flexibly adjust the direction of the screw feeder assembly according to the existing factory layout, greatly enhancing the equipment's installation convenience and on-site adaptability, providing users with a more flexible and convenient material conveying solution.

[0012] The present disclosure will now be further described in conjunction with the accompanying drawings and specific embodiments. Additional aspects and advantages provided by the present disclosure will be set forth in part in the description which follows, and in part will be obvious from the description or may be learned by practice. Attached Figure Description

[0013] The accompanying drawings, which form part of this specification, are used to aid in understanding this disclosure. The contents provided in the drawings and their related descriptions in this specification may be used to interpret this disclosure, but do not constitute an undue limitation of this disclosure.

[0014] Figure 1 This is an external view of the vertical ultrafine pulverizer according to Embodiment 1 of this disclosure.

[0015] Figure 2 for Figure 1 The image shows a cross-sectional view of a vertical ultrafine pulverizer.

[0016] Figure 3 for Figure 1 The diagram shows the hammer spacing in a vertical ultrafine pulverizer.

[0017] Figure 4 for Figure 1 The diagram shows the external shape of the feeding structure in the vertical ultrafine pulverizer.

[0018] Figure 5 This is a front view of the vertical ultrafine pulverizer according to Embodiment 2 of this disclosure.

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

[0020] Figure 7 for Figure 6 The image shows a top view of a vertical ultrafine pulverizer.

[0021] Figure 8 for Figure 5 The diagram shows the external shape of the feeding structure in the vertical ultrafine pulverizer.

[0022] Figure 9 for Figure 5 The diagram shows a cross-sectional view of the feeding structure in the vertical ultrafine pulverizer. Detailed Implementation

[0023] The present disclosure will now be clearly and completely described in conjunction with the accompanying drawings. Those skilled 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 should be particularly noted that:

[0024] The technical solutions and features provided in the various sections, including the following description, can be combined with each other without conflict. Furthermore, where possible, these technical solutions, features, and related combinations can be given specific technical subject matter and protected by relevant patents.

[0025] The embodiments described below are generally only some embodiments and not all embodiments. All other embodiments obtained by those skilled in the art based on these embodiments without creative effort should fall within the scope of patent protection.

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

[0027] Figure 1 This is an external view of the vertical ultrafine pulverizer according to Embodiment 1 of this disclosure. Figure 2 for Figure 1 The image shows a cross-sectional view of a vertical ultrafine pulverizer. Figure 3 for Figure 1 The diagram shows the hammer spacing in a vertical ultrafine pulverizer. Figure 4 for Figure 1 The diagram shows the external shape of the feeding structure in the vertical ultrafine pulverizer. Figures 1-4 As shown, the vertical ultrafine pulverizer of Embodiment 1 of this disclosure includes a pulverizing chamber 1, a pulverizing disc rotation drive mechanism 2 that is drivenly connected to the pulverizing disc 11 located in the pulverizing chamber 1, and a feeding structure 3, a discharging structure 4, and an air inlet structure that are respectively connected to the pulverizing chamber 1.

[0028] In the grinding chamber 1, a grinding structure is provided between the edge of the grinding disc 11 and the area on the inner wall of the grinding chamber 1 corresponding to the outer edge. The grinding structure includes hammers 12 circumferentially spaced at the edge of the grinding disc 11 and toothed rings 13 disposed on the inner wall of the grinding chamber 1 in the area corresponding to the outer edge. The hammer tooth gap 14 formed between the hammers 12 and the toothed rings 13 (reference) Figure 3 During operation, the crushing disc 11 is driven to rotate within the crushing chamber 1 by the crushing disc rotation drive mechanism 2, 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 disc 11 is vertically arranged during rotation. The spacing between adjacent hammers (e.g.) Figure 3 The distance between adjacent hammers can be represented by the distance D, which is usually any value between 200mm and 250mm.

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

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

[0031] The air intake structure is used to introduce an upward airflow into the lower part of the grinding chamber. Generally, the air intake structure includes an external air intake channel arranged in the base of the lower part of the grinding chamber 1. In one embodiment, the external air intake channel may be arranged around the grinding disc rotary drive shaft assembly 21 to provide air cooling for the grinding disc rotary drive shaft assembly 21 (such as the upper bearing system 212 and the lower bearing system 213).

[0032] Typically, the crushing chamber 1 is equipped with an airflow hood 15, which has a cylindrical side portion 151 and a top portion 152 located above the side portion 151. The top portion has an upper opening, and the lower end of the side portion forms a lower opening. The side portion is mounted on the inner wall of the crushing chamber 1 by a support structure and is coaxially arranged with the crushing chamber 1. The upper opening of the airflow hood 15 is located outside the material classifying wheel 42, and the lower opening of the airflow hood is suspended above the crushing disc 11. An internal channel is formed inside the airflow hood 15, and an external channel is formed between the airflow hood 15 and the inner wall of the crushing chamber.

[0033] The function of the airflow hood 15 is to construct an airflow channel. It forms an internal channel through the side 151 and top 152, and an external channel between itself and the inner wall of the crushing chamber 1. The upper opening of the airflow hood 15 is located outside the material classifier wheel 42, and the lower opening is suspended above the crushing disc 11 and coaxially mounted with the crushing chamber 1. This structural design allows the upward airflow introduced by the air intake structure to form a reasonable airflow path within the crushing chamber 1. This allows the crushed material to flow from the external channel to the material classifier wheel 42 under the influence of the airflow, while larger particles intercepted by the material classifier wheel 42 flow downward through the internal channel and then return to the crushing structure.

[0034] The discharge structure 4 is located at the top of the crushing chamber 1 and is used to discharge the crushed material from the vertical ultrafine pulverizer by the airflow introduced into the crushing chamber 1 from the air inlet structure. Specifically, the discharge structure includes a discharge chamber 41 located at the top of the crushing chamber 1. A material classifying wheel 42 is provided between the discharge chamber 41 and the crushing chamber 1. A material classifying wheel rotation drive motor 43 is installed on the top of the discharge chamber 41. The output shaft of the material classifying wheel rotation drive motor 43 is connected to the material classifying wheel 42 through a material classifying wheel rotation drive shaft assembly 44 installed in the discharge chamber 41. A discharge port 45 is provided on the side of the discharge chamber 41.

[0035] When the discharge structure 4 is working, the upward airflow introduced from the air inlet structure carries the crushed material to the top of the crushing chamber 1. The material classifying wheel 42 is driven to rotate by the material classifying wheel rotation drive motor 43 to classify and screen the material. The material with qualified fineness enters the discharge chamber 41 with the airflow through the material classifying wheel 42 and is finally discharged from the discharge port 45; while the material with unqualified particle size is blocked by the material classifying wheel 42 and falls back into the crushing chamber 1 to continue to be crushed.

[0036] The feeding structure 3 is used to quantitatively convey materials 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 mounted on the shell of the crushing chamber 1 via a bracket 35 and is connected to the rotating shaft in the screw feeder 32 via the transmission mechanism 34. The feeding pipe 31 is located on the outside of the crushing chamber 1. The top of the feeding pipe 31 is connected to the screw feeder 32, and the side or bottom of the feeding pipe is connected to the feed port on the side wall of the crushing chamber 1. The entire feeding structure 3 is fixed as a whole and is mounted on the shell of the crushing chamber 1 by the bracket 35.

[0037] When the feeding structure 3 is working, the material is fed in from the feed port of the screw feeder 32. The motor 33 drives the shaft in the screw feeder 32 to rotate through the transmission mechanism 34, so that the screw blades in the screw feeder push the material along the screw feeder 32, and then into the feed pipe 31. Finally, the material is transported to the crushing structure in the crushing chamber 1 through the feed port on the side or bottom of the feed pipe 31 that connects with the side wall of the crushing chamber 1, ensuring that the material enters the crushing area smoothly and continuously for crushing.

[0038] In the vertical ultrafine pulverizer of Embodiment 1 of this disclosure, the diameter of the pulverizing disc 11 is 2000mm and the edge linear velocity during operation is 165m / s. The working process of the vertical ultrafine pulverizer is as follows: When the vertical ultrafine pulverizer is first started, it is in an unloaded state. The pulverizing disc rotation drive motor 22 only needs to overcome the inertial resistance of the pulverizing disc 11 and the pulverizing disc rotation drive mechanism 2, and the current is maintained at the unloaded level. When the material begins to be conveyed to the pulverizing chamber 1 through the feeding structure 3, the pulverizing action between the hammer 12 and the toothed ring 13 applies impact and shear force to the material, and the load of the vertical ultrafine pulverizer increases accordingly. The current of the pulverizing disc rotation drive motor 22 gradually increases, but the control system will maintain the rotation speed of the pulverizing disc 11 constant through frequency regulation to ensure that the edge linear velocity of the pulverizing disc 11 is stable at 165m / s. As the feed rate continues to increase, the current of the grinding disc rotary drive motor 22 continues to rise until it reaches the current value corresponding to the rated power of the grinding disc rotary drive motor 22 of 250kW. At this point, the control system limits the feed rate to this level to prevent the vertical ultrafine pulverizer from being overloaded. Under this rated power condition, the rotation speed of the grinding disc 11 remains stable, and the edge linear velocity is maintained at 165m / s, reaching the maximum capacity of the equipment.

[0039] In the vertical ultrafine pulverizer of Embodiment 1 of this disclosure, the upper bearing system 212 adopts a deep groove ball bearing with a specification of 6234 or 6334, and the lower bearing system 213 adopts a deep groove ball bearing with a specification of 6234, 6232, 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 170mm, an outer diameter of 310mm, and a width of 52mm, belonging to the narrow series design; the 6334 specification maintains the same inner diameter of 170mm but increases the outer diameter to 360mm and the width to 72mm, belonging to the medium width series; among the specifications that can be selected for the lower bearing system 213, the 6232 bearing has an inner diameter of 160mm, an outer diameter of 290mm, and a width of 48mm; the 6332 bearing also has an inner diameter of 160mm but an outer diameter of 340mm and a width of 68mm.

[0041] The 6234 / 6232 / 6334 / 6332 deep groove ball bearings used in the vertical ultrafine pulverizer of Embodiment 1 of this disclosure exhibit significant economic advantages. Generally, larger-sized bearings are often used in the aforementioned vertical ultrafine pulverizers. These 170mm inner diameter deep groove ball bearings are smaller and lighter, significantly reducing procurement costs. Furthermore, the dimensions of the bearing housing and related support structures are correspondingly reduced, further saving material costs. Simultaneously, the smaller bearing size results in lower starting torque, reducing operating energy consumption. During maintenance and replacement, these standardized bearings are readily available on the market at reasonable prices, reducing downtime maintenance costs. Particularly noteworthy is that these relatively economical bearings can meet the usage requirements of the aforementioned vertical ultrafine pulverizer (mainly because the edge linear velocity of the pulverizing disc 11 is not high during operation and the rated power increase of the pulverizing disc rotation drive motor is not significant), thus achieving a balance between cost control and equipment performance.

[0042] Based on the vertical ultrafine pulverizer of Embodiment 1 of this disclosure, the diameter of the pulverizing disc 11 can be reasonably expanded from 2000mm to 1950mm-2050mm. This slight change will not alter the basic working principle and performance characteristics of the equipment.

[0043] The vertical ultrafine pulverizer of Embodiment 1 of this disclosure was used to conduct pulverization experiments on fish feed ingredients, including fish meal (30wt%-40wt%), soybean meal (15wt%-25wt%), wheat flour or corn flour (20wt%-30wt%), fish oil (5wt%-10%), and conventional fish feed additives (3wt%-5wt%). The same formula of fish feed ingredients was used in each experiment. The hammer tooth gap 14 was consistently set at 5mm, and the distance between adjacent hammers was 217mm. The edge linear velocity of the pulverizing disc and the rated power of the pulverizing disc rotation drive mechanism were adjusted for different experiments. The maximum production capacity, unit energy consumption, and bearing operation were then measured. Finally, a comprehensive score was given for each experimental example. Fixed factors: 2000mm diameter of the crushing disc; Variable factors: edge linear velocity (m / s), with five levels: 155, 160, 165, 170, and 175; rated power (kW), with five levels: 210, 230, 250, 270, and 290. Experimental conditions and comprehensive scores for each experimental example are shown in Table 2. Edge linear velocity effect analysis (fixed power 250kW) is shown in Table 3. Power effect analysis (fixed edge linear velocity 165m / s) is shown in Table 4.

[0044] The comprehensive scoring method is based on a multi-parameter weighted evaluation system, dividing the performance indicators of the vertical ultrafine pulverizer into four key dimensions: output (30%) reflecting production efficiency, unit energy efficiency (20%) reflecting economy, bearing temperature rise (40%) assessing reliability and safety, and bearing life prediction (10%) considering the long-term use value of the equipment. After normalization, each indicator is weighted and summed to form an evaluation system of 0-100 points, fully reflecting the comprehensive balance between production efficiency, economy, and reliability of the equipment. It particularly emphasizes the decisive influence of the bearing system as a key component on the overall performance of the machine. Bearing temperature rise refers to the increase in bearing temperature relative to ambient temperature during operation, expressed in degrees Celsius.

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

[0046]

[0047]

[0048] Table 3: Edge Linear Velocity Effect Analysis (Fixed Power 250kW)

[0049]

[0050] Table 4: Power Effect Analysis (Fixed Edge Linear Velocity 165m / s)

[0051]

[0052] The above experimental results show that:

[0053] 1) Critical transition of linear velocity: When the linear velocity at the edge of the crushing disc increased from 155 m / s to 160 m / s, the score jumped from 81 to 94, an increase of 16.0%, indicating that 160 m / s is the clear lower limit for performance improvement; when the linear velocity at the edge of the crushing disc increased from 170 m / s to 175 m / s, the score dropped sharply from 93 to 82, a decrease of 11.8%, indicating that 170 m / s is the clear upper limit for 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's 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 the parameter range: The average score of test points (7-9, 12-14, 17-19) within the range of 160-170m / s linear speed and 230-270kW power reached 93.1 points; the average score of test points outside the range was only 80.2 points, with a difference of 12.9 points, demonstrating the outstanding advantages within the parameter range.

[0056] In summary, the experimental examples demonstrate significant performance advantages within the parameter range of "grinding disc diameter 1950mm-2050mm, edge linear velocity 160m / s-170m / s, rated power 230kW-270kW," verifying that this parameter range is not randomly selected but rather an optimal configuration range based on the equipment's physical characteristics and engineering practice. This is particularly suitable for vertical ultrafine pulverizer designs where the upper bearing system 212 uses deep groove ball bearings of specification 6234 or 6334, and the lower bearing system 213 uses deep groove ball bearings of specification 6234, 6232, 6334, or 6332.

[0057] Furthermore, the vertical ultrafine pulverizer of Embodiment 1 of this disclosure also improves the discharge structure 4. For example... Figure 1-2 As shown, the discharge chamber 41 is specifically a conical chamber with the smaller end facing upwards, and the discharge port 45 has an inclined upward-facing guide channel (i.e., Figure 2 The top surface of the conical chamber intersects with the top surface of the guide channel to form an unobstructed transition area (the upward-sloping channel where the discharge port 45 is located).

[0058] The aforementioned vertical ultrafine pulverizer innovatively designs the discharge chamber 41 as a conical chamber with the smaller end facing upwards, altering the hydrodynamic characteristics of traditional discharge structures and effectively eliminating dead zones and stagnation points that easily form in the top area of ​​the discharge chamber 41. This conical structure allows the pulverized material carried by the airflow to form a uniformly contracting path during vertical flow, reducing the generation of eddies and reverse airflow. Furthermore, the guide channel of the discharge port 45 is arranged at an upward angle, precisely intersecting with the top surface of the conical chamber to form an unobstructed transition area. This design detail ensures the continuity and stability of material flow. After the pulverized ultrafine material enters the conical chamber under the airflow, it can follow the shortest resistance path, smoothly turning along the natural curvature of the inner wall of the chamber and flowing through the guide channel into the pipe above the vertical ultrafine pulverizer (and then being transported to the material collection system through this pipe). This not only improves material conveying efficiency but also reduces wear inside the discharge structure caused by high-speed material impact.

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

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

[0061] As mentioned earlier, the crushing chamber 1 is provided with an airflow hood 15, which has a cylindrical side portion 151 and a top portion 152 located above the side portion 151. The top portion has an upper opening, and the lower end of the side portion forms a lower opening. The side portion is mounted on the inner wall of the crushing chamber 1 by a support structure and is coaxially arranged with the crushing chamber 1. The upper opening of the airflow hood 15 is located outside the material classifying wheel 42, and the lower opening of the airflow hood is suspended above the crushing disc 11. An internal channel is formed inside the airflow hood 15, and an external channel is formed between the airflow hood 15 and the inner wall of the crushing chamber.

[0062] Based on this, in one optional embodiment, the upper surface of the top of the airflow shroud 15 is a plane with an angle of ±10° between it and the flow direction of the guide channel. This geometric configuration allows the airflow and material flowing from the material classifier wheel 42 into the discharge chamber 41 to flow into the guide channel more smoothly and over a shorter distance, reducing eddies and resistance losses caused by abrupt changes in airflow direction, and helping to improve the efficiency and stability of the vertical ultrafine pulverizer during the material output process.

[0063] Furthermore, the cross-section of the flow guide channel is rectangular, and the difference between its inner edge width and the upper inner edge width of the discharge chamber 41 is 0mm-50mm. When the discharge chamber is a conical chamber, the upper inner edge width of the discharge chamber refers to the diameter of the upper inner edge of the discharge chamber. This dimensional configuration ensures minimal cross-sectional change in the flow transition from the conical chamber (small end upwards) to the flow guide channel, reducing pressure fluctuations and eddy formation caused by rapid expansion or contraction of the cross-section.

[0064] Figure 5 This is a front view of the vertical ultrafine pulverizer according to Embodiment 2 of this disclosure. Figure 6 for Figure 5 The left view of the vertical ultrafine pulverizer shown. Figure 7 for Figure 6 The image shows a top view of a vertical ultrafine pulverizer. Figure 8 for Figure 5 The diagram shows the external shape of the feeding structure in the vertical ultrafine pulverizer. Figure 9 for Figure 5 A cross-sectional view of the feeding structure in the vertical ultrafine pulverizer shown. Figures 5-9 As shown, the vertical ultrafine pulverizer of Embodiment 2 of this disclosure improves the feeding structure 3 in the vertical ultrafine pulverizer of Embodiment 2 of this disclosure.

[0065] like Figures 5-9 As shown, the feeding structure of the vertical ultrafine pulverizer in Embodiment 2 of this disclosure includes a feeding pipe 31, a screw feeder 32, and a reduction motor 36. The reduction motor 36 is mounted on the housing 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 located outside the pulverizing chamber 1. The top of the feeding pipe 31 is provided with a screw feeder assembly mounting interface, and 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. After the pulverizing chamber docking interface is connected to the feed port on the side wall of the pulverizing chamber, it can support the feeding pipe 31 and the screw feeder assembly located on the feeding pipe 31.

[0066] The aforementioned vertical ultrafine pulverizer, through its innovative feeding structure design, solves the technical problem of the feeding structure of the vertical ultrafine pulverizer in Embodiment 1, which could only be fixed to the outside of the pulverizer in a fixed form. Its core improvement lies in designing the feeding pipe 31 as an independent component, with a horizontally positioned screw feeder assembly mounting interface at the top. This allows the screw feeder assembly (composed of a geared motor 36 directly connected to the rotating shaft in the screw feeder 32) to be flexibly installed and supported at different rotation angles, with the central axis A of the screw feeder assembly mounting interface as the rotation axis. Simultaneously, the side or bottom of the feeding pipe 31 has a pulverizing chamber docking interface that connects to the feeding port on the side wall of the pulverizing chamber 1, supporting the entire feeding pipe 1 and screw feeder assembly. This design significantly improves the installation adaptability of the vertical ultrafine pulverizer, eliminating the need for users to change the on-site layout of their material supply facilities to accommodate a fixed screw feeder position. Instead, users can flexibly adjust the direction of the screw feeder assembly according to the existing factory layout, greatly improving the equipment's installation convenience and on-site adaptability, and providing users with a more flexible and convenient material conveying solution.

[0067] Specifically, the feed pipe 31 is vertically arranged, and the crushing chamber docking interface is located on the side of the feed pipe 31. An air inlet 311 is provided on the pipe wall of the feed pipe 31 on the side opposite to the crushing chamber docking interface. A screen plate 312 is also provided above the crushing chamber docking interface in the feed pipe 31. The screen plate 312 is installed at an angle, and a gap is formed between the lower edge of the screen plate 312 and the pipe wall of the crushing chamber 1 to allow materials that do not pass through the screen holes of the screen plate 312 to fall downward and pass through the area of ​​the air inlet 311.

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

[0069] In one optional embodiment, the screw feeder mounting interface adopts a flange docking structure to dock with the screw feeder assembly. In this flange docking structure, all bolt connection members around the screw feeder mounting interface are bolt connection members of the same specification, thereby allowing the screw feeder assembly as a whole to be mounted 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.

[0070] By adopting a flanged connection structure at the screw feeder mounting interface and ensuring that all bolted connection components around the interface are of the same specification, the screw feeder assembly can be installed at any angle on the interface with the central axis A of the screw feeder mounting interface 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. This significantly improves the installation convenience, adaptability, and operational flexibility of the equipment, providing users with a more convenient material conveying solution.

[0071] If we assume that the central axis of the screw shaft of the screw feeder 32 is perpendicular to both the central axis of the rotating shaft and the central axis of the crushing chamber docking interface, and the rotating shaft is perpendicular to the central axis of the crushing chamber docking interface, then the screw feeder assembly is at the position with a rotation angle of 0° (reference). Figure 7 If the state shown is such that the screw feeder assembly can be installed on the screw feeder mounting interface at a rotation angle of 0°-180°, which ensures that the screw feeder assembly does not structurally interfere with other structures of the vertical ultrafine pulverizer.

[0072] The foregoing has described the relevant content of this disclosure. Those skilled in the art will be able to implement this disclosure based on these descriptions. All other embodiments obtained by those skilled in the art based on the foregoing content of this specification without inventive effort should fall within the scope of this disclosure.

Claims

1. A vertical ultrafine pulverizer, comprising a pulverizing chamber, a pulverizing disc located in the pulverizing chamber, a pulverizing disc rotating driving mechanism in driving connection with the pulverizing disc, and a feeding structure, a discharging structure and an air inlet structure respectively in communication with the pulverizing chamber, a pulverizing structure is provided between the edge of the pulverizing disc and the area on the inner wall of the pulverizing chamber corresponding to the edge, the pulverizing structure comprises hammer heads circumferentially and spacedly arranged 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 edge, a hammer-tooth gap is formed between the hammer heads and the gear ring, in operation, the pulverizing disc is driven by the pulverizing disc rotating driving mechanism to rotate in the pulverizing chamber so that the material delivered to the pulverizing structure through the feeding structure is pulverized by the pulverizing structure, the center line of the rotation of the pulverizing disc is vertically arranged, the air inlet structure is used to introduce upward flowing air flow into the lower part of the pulverizing chamber, the discharging structure is located in the upper part of the pulverizing chamber and is used to discharge the pulverized material carried by the air flow introduced into the pulverizing chamber from the air inlet structure out of the vertical ultrafine pulverizer, characterized in that: The feeding structure comprises a feeding pipe, a screw feeder and a speed reducer motor, the speed reducer motor is installed on the shell of the screw feeder and directly connected with the rotating shaft in the screw feeder to form a screw feeder assembly, the feeding pipe is arranged outside the crushing chamber, the top of the feeding pipe is provided with a screw feeder assembly mounting interface, the side or bottom of the feeding pipe is provided with a crushing chamber butt joint interface, the screw feeder assembly mounting interface is horizontally arranged, the screw feeder assembly as a whole can be mounted and supported on the screw feeder assembly mounting interface at different rotation angles based on the central axis of the screw feeder assembly mounting interface as the rotating shaft, the screw feeder is in communication with the feeding pipe through the screw feeder assembly mounting interface, and the crushing chamber butt joint interface is butt jointed with the feeding port on the sidewall of the crushing chamber to support the feeding pipe and the screw feeder assembly on the feeding pipe.

2. The vertical ultrafine grinder according to claim 1, wherein: The feeding pipe is vertically arranged, the crushing chamber butt joint interface is arranged on the side of the feeding pipe, the air inlet is arranged on the pipe wall of the feeding pipe opposite to the side of the crushing chamber butt joint interface, and the sieve plate is arranged above the crushing chamber butt joint interface in the feeding pipe, the sieve plate is obliquely arranged, and the gap between the lower edge of the sieve plate and the pipe wall of the crushing chamber forms a gap for dropping the materials not passing through the sieve holes of the sieve plate downward and passing through the air inlet area.

3. The vertical ultrafine grinder according to claim 1, wherein: The screw feeder assembly mounting interface adopts a flange butt joint structure to butt joint with the screw feeder assembly, the bolt connecting members around the screw feeder assembly mounting interface are the same size, so that the screw feeder assembly as a whole can be mounted on the screw feeder assembly mounting interface at different rotation angles based on the central axis of the screw feeder assembly mounting interface as the rotating shaft.

4. The vertical ultrafine grinder according to claim 1, wherein: If the central axis of the screw shaft of the screw feeder is perpendicular to the rotating shaft and the central axis of the crushing chamber butt joint interface, and the rotating shaft is perpendicular to the central axis of the crushing chamber butt joint interface, the screw feeder assembly is in the 0° position, and the screw feeder assembly can be mounted on the screw feeder assembly mounting interface at a plurality of rotation angles of 0°-180°, so that the screw feeder assembly does not interfere with other structures of the vertical ultrafine crusher.

5. The vertical ultrafine pulverizer according to any one of claims 1-4, characterized in that: The discharging structure comprises a discharging chamber arranged on the top of the crushing chamber, a material grading wheel is arranged between the discharging chamber and the crushing chamber, a material grading wheel rotating drive motor is arranged on the top of the discharging chamber, the output shaft of the material grading wheel rotating drive motor is connected with the material grading wheel through a material grading wheel rotating drive shaft assembly arranged in the discharging chamber, the side of the discharging chamber is provided with a discharging port, the discharging chamber is a conical cabin with a small end upward, the discharging port has an inclined upward arranged flow guide channel, and the top surface of the conical cabin intersects with the top surface of the flow guide channel to form an unobstructed transition area.

6. The vertical ultrafine grinder according to claim 5, wherein: The included angle between the flow guide direction of the flow guide channel and the horizontal plane is 140°-170°.

7. The vertical ultrafine grinder according to claim 5, wherein: The discharging chamber is a conical cabin.

8. The vertical ultrafine grinder according to claim 7, wherein: The included angle between the conical generatrix of the conical chamber and the axis is 20°-40°.

9. The vertical ultrafine grinder according to claim 5, wherein: The wind flow cover is provided with a side part in the shape of a cylinder and a top part above the side part, the top part is provided with a wind flow cover upper opening, the lower end of the side part forms a wind flow cover lower opening, the side part is installed on the inner wall of the crushing chamber through a support structure and is coaxially arranged with the crushing chamber, the wind flow cover upper opening hole is located outside the material grading wheel, the wind flow cover lower opening is suspended above the crushing disc, the inside of the wind flow cover forms an internal passage, and the external passage is formed between the wind flow cover and the inner wall of the crushing chamber; wherein the upper surface of the top part is a plane with an included angle of ±10° with the flow direction of the flow guide passage.

10. The vertical ultrafine grinder according to claim 5, wherein: The cross section of the flow guide passage is rectangular and the difference between the inner edge width of the flow guide passage and the inner edge width of the upper end of the discharge chamber is 0mm-50mm.

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