A uniform material buffer bin structure of a Raymond mill front end feeding device
Patent Information
- Application Number
- CN202522426810.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-17
- Publication Date
- 2026-10-09
- Estimated Expiration
- 2035-11-17
AI Technical Summary
[0003]有鉴于此，本实用新型提供的一种雷蒙机前端给料装置的均料缓冲仓结构，解决了现有雷蒙机前端给料装置因缺乏均料缓冲机制致物料分布不均、冲击磨损大、运行不稳的问题
[0013]采用上述改进方案的有益效果为：导流板外缘的波浪形设计使得物料在螺旋通道中的流动产生周期性的扰动,波峰处的较小间隙对物料产生适度的挤压作用促进物料之间的相互混合,波谷处的较大间隙为物料提供了局部的缓冲空间避免了持续挤压造成的物料压实和堵塞,这种波浪形结构使得物料流在螺旋下降过程中产生横向的微小振荡,增强了物料的分散和均匀效果,同时波浪形外缘还增大了导流板与物料的接触面积,提高了导流板对物料流动的控制能力。
Smart Images
Figure CN224830911U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of buffer bin structure, specifically, it relates to a material equalization buffer bin structure of a Raymond mill front-end feeding device. Background Technology
[0002] Raymond mills are widely used powder processing equipment in industries such as mining, building materials, chemicals, and metallurgy. They are primarily used to grind lumpy or granular materials into fine powder. Their working principle involves grinding rollers pressing tightly against a grinding ring under centrifugal force. The material is crushed by compression, grinding, and shearing between the rollers and the grinding ring. In actual production, the material enters the grinding chamber from the top of the Raymond mill through a feeding device. However, most existing feeding devices use simple funnel or chute structures, allowing the material to fall directly into the grinding chamber under gravity. This feeding method has significant drawbacks. Because the flow of material in the funnel or chute is uncontrolled, it often directly impacts the grinding system with a concentrated flow, resulting in extremely uneven material distribution within the grinding chamber. Material accumulates heavily near the feed inlet while the edge areas have insufficient material. This uneven distribution leads to problems with the operation of the grinding rollers and grinding ring. Uneven load, with some areas experiencing excessive wear while others are underutilized, severely impacts grinding efficiency and equipment lifespan. Furthermore, when fluctuations occur in the upstream feeding system, existing feeding devices cannot provide effective buffering. Instantaneous changes in feed rate are directly transmitted to the grinding system, causing drastic fluctuations in the material quantity within the grinding chamber. This not only affects the stability of product particle size but may also lead to equipment overload or idling, increasing energy consumption and failure rate. To improve this situation, some technical solutions attempt to add vibrating distribution devices or rotary distributors to the feeding device. However, these solutions require additional power and control systems, resulting in complex structures, high costs, and difficult maintenance. Moreover, they are prone to failure in dusty environments. Therefore, there is an urgent need for a Raymond mill front-end feeding device that is simple in structure, reliable in operation, requires no additional power, and can effectively achieve uniform material distribution and buffering. Utility Model Content
[0003] In view of this, the present invention provides a material equalization buffer bin structure for the front-end feeding device of a Raymond mill, which solves the problems of uneven material distribution, large impact wear, and unstable operation caused by the lack of a material equalization buffer mechanism in the existing Raymond mill front-end feeding devices.
[0004] This utility model is implemented as follows:
[0005] This utility model provides a material equalization buffer bin structure for a Raymond mill front-end feeding device, including a bin body, a guide plate, and a discharge port. The bin body is shaped like an inverted frustum, with the upper opening area larger than the lower opening area. The guide plate is disposed inside the bin body and fixedly connected to the inner wall of the bin body. The guide plate has a helical curved surface shape, and the pitch of the helical curved surface gradually decreases from top to bottom along the axial direction of the bin body. A helical channel is formed between the outer edge of the guide plate and the inner wall of the bin body. The discharge port is located at the center of the bottom of the bin body, and the inner wall of the discharge port expands downward in a trumpet shape. When material enters from the upper end of the bin body, the helical curved surface of the guide plate guides the material to make a spiral downward movement along the inner wall of the bin body.
[0006] The technical effects of the uniform material buffer bin structure of the Raymond mill front-end feeding device provided by this utility model are as follows: By designing the bin body into an inverted truncated cone shape and cooperating with a spiral curved guide plate, the material entering the bin body can form an orderly spiral downward motion under the guidance of gravity and the guide plate. The movement path of the material in the spiral channel is extended, increasing the residence time of the material in the bin body, realizing the uniform distribution of the material and the buffering effect. The design of gradually decreasing pitch makes the material gradually converge and tend to be uniform during the descent. The trumpet-shaped structure of the discharge port, together with the spiral downward material flow, realizes stable discharge and effectively avoids the impact and blockage caused by the direct fall of the material.
[0007] Based on the above technical solution, the material equalization buffer bin structure of the Raymond mill front-end feeding device of this utility model can be further improved as follows:
[0008] The angle between the spiral surface of the guide plate and the axis of the hopper gradually increases from 35° to 55° from top to bottom along the axial direction.
[0009] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the design of the spiral curved surface of the guide plate and the axis of the silo gradually increasing from top to bottom makes the material have a larger horizontal motion component and a slower descent speed in the upper part of the silo, which is conducive to the initial dispersion and uniform distribution of the material. In the lower part of the silo, the horizontal motion component decreases and the descent speed increases, which is conducive to the material converging towards the discharge port. This gradient change of the angle realizes the smooth transition of the material flow state, avoids the material from stagnating in a certain area or falling too fast, and ensures the continuity and stability of the material buffering effect.
[0010] Furthermore, the ratio of the upper opening diameter to the lower opening diameter of the inverted frustum structure of the silo body is 3:1 to 5:1.
[0011] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the ratio of the upper and lower opening diameters of the silo's inverted truncated cone structure is controlled within a specific range, so that the silo's shrinkage rate matches the material's natural angle of repose. This avoids the problems of material bridging and blockage caused by excessively rapid silo shrinkage or material falling directly due to excessively slow shrinkage. This diameter ratio design, combined with the spiral guiding effect of the baffle, ensures that the material maintains good contact with the inner wall of the silo and the baffle during the descent, ensuring the continuity of material flow. At the same time, this diameter ratio also gives the silo a reasonable volume distribution, with a larger upper volume for buffering and a smaller lower volume for collection.
[0012] Furthermore, the outer edge of the guide plate is wavy, with wave crests and troughs alternating along a spiral direction, and the gap between the wave crest and the inner wall of the hopper is smaller than the gap between the wave trough and the inner wall of the hopper.
[0013] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the wave-shaped design of the outer edge of the guide plate causes periodic disturbances in the flow of material in the spiral channel. The smaller gap at the crest of the wave exerts a moderate squeezing effect on the material, promoting the mixing between materials. The larger gap at the trough provides local buffer space for the material, avoiding material compaction and blockage caused by continuous squeezing. This wave-shaped structure causes the material flow to generate small lateral oscillations during the spiral descent, enhancing the dispersion and uniformity of the material. At the same time, the wave-shaped outer edge also increases the contact area between the guide plate and the material, improving the guide plate's control over the material flow.
[0014] Furthermore, the guide plate has multiple through holes on its spiral curved surface. The through holes are elliptical in shape, and the major axis of the elliptical through holes is parallel to the direction of the material spiraling downward.
[0015] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the elliptical through holes on the spiral curved surface of the guide plate provide a passage for materials to cross the spiral channel, allowing some materials to pass directly through the guide plate without having to descend completely along the spiral channel. This design avoids excessive retention caused by all materials being forced into spiral motion. The elliptical shape of the through holes and the design that the major axis is parallel to the spiral descent direction of the materials minimize the flow resistance of the materials passing through the through holes and prevent significant turbulence. The presence of the through holes also creates pressure balance between materials at different heights in the bin, preventing excessive accumulation of materials in local areas and improving the overall material uniformity and the continuity of discharge.
[0016] Furthermore, the expansion angle of the funnel-shaped inner wall of the discharge port is 15° to 25°, and the surface of the funnel-shaped inner wall is provided with multiple convex ridges extending along the axial direction.
[0017] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: The expansion design of the funnel-shaped inner wall of the discharge port allows the material gathered at the discharge port to smoothly transition to the downstream Raymond mill main unit, avoiding material blockage and sudden changes in flow rate caused by direct contraction of the discharge port. The expansion angle is controlled within an appropriate range, which not only ensures the smooth flow of material but also avoids material dispersion caused by excessive expansion. The multiple axial convex ridges on the funnel-shaped inner wall guide the falling material, allowing the material to enter the downstream equipment in a uniform axial distribution. The convex ridges can also break the adhesion and accumulation of material on the inner wall of the discharge port, keep the discharge channel unobstructed, and ensure the stability and uniformity of the discharge.
[0018] Furthermore, the inner wall surface of the chamber is provided with multiple vertical grooves extending along the axial direction. The depth of the vertical grooves gradually increases from top to bottom along the axial direction, and an intermittent spiral channel is formed between the vertical grooves and the outer edge of the guide plate.
[0019] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: The vertical grooves on the inner wall of the silo cooperate with the outer edge of the guide plate to form an intermittent spiral channel, which causes the material flow to generate periodic diversion and convergence during the spiral descent. The design of the groove depth gradually increasing along the axial direction makes the diversion effect more obvious in the lower part of the silo, further promoting the uniform distribution of materials when approaching the discharge port. The vertical grooves also provide additional descent channels for materials, allowing some materials to descend quickly through the grooves, avoiding excessive flow resistance caused by all materials having to move along the spiral channel. This intermittent spiral channel design balances the residence time and flow efficiency of materials, achieving the best material uniformity and buffering effect.
[0020] Furthermore, the guide plate is fixedly connected to the inner wall of the chamber by welding, and the welding position is located at the trough of the outer edge of the guide plate.
[0021] The beneficial effects of the above-mentioned improvement scheme are as follows: the guide plate and the inner wall of the silo are fixedly connected at the trough by welding. Taking advantage of the large gap between the trough and the inner wall in the wavy outer edge, the welding operation is more convenient and the weld quality is easier to guarantee. The welding position at the trough ensures that the weld does not protrude into the spiral channel and interfere with the material flow, thus maintaining the smoothness of the spiral channel. At the same time, the absence of welding at the crest retains a small gap, allowing the outer edge of the guide plate to continuously guide the material at the crest. This selective welding method not only ensures a firm connection between the guide plate and the silo, but also maintains the function of the wavy outer edge of the guide plate in regulating the material flow.
[0022] Furthermore, the hopper body is made of stainless steel sheet with a wall thickness of 8mm to 12mm, and the baffle plate is made of carbon steel sheet with a thickness of 6mm to 10mm.
[0023] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: The silo body is made of stainless steel plate, which has good corrosion resistance and wear resistance, and can adapt to various materials, especially materials containing corrosive components or with high hardness. The silo body wall thickness is designed within an appropriate range to ensure that the structural strength can withstand the lateral pressure and impact of the material, while avoiding material waste and weight increase caused by excessive thickness. The guide plate is made of carbon steel plate, which has sufficient strength and rigidity to withstand the impact and wear of the material. The thinner design of the guide plate reduces the burden of the guide plate's own weight on the silo body. At the same time, the thinner guide plate also makes the effective volume of the spiral channel larger, improving the material throughput capacity.
[0024] Furthermore, the starting end of the spiral surface of the guide plate is located 50mm to 80mm below the opening at the upper end of the hopper, and the ending end of the spiral surface is located 100mm to 150mm above the discharge port, with the spiral surface completing 2 to 3 full spiral turns.
[0025] The beneficial effects of the above-mentioned improved scheme are as follows: The starting end of the spiral surface of the guide plate is set at a certain distance below the opening at the upper end of the hopper, providing initial buffering and dispersion space for the material after it enters the hopper, avoiding wear and splashing caused by the material directly impacting the starting end of the guide plate. The ending end of the spiral surface is set at an appropriate distance above the discharge port, so that the material has enough space to converge and stabilize after completing the spiral motion, avoiding the flow resistance caused by the guide plate extending directly to the discharge port. The design of the spiral surface completing 2 to 3 full spirals allows the material to have a sufficiently long spiral motion path to achieve full homogenization, while avoiding excessive flow resistance and residence time caused by too many spirals. This optimized design of the starting and ending positions and the number of spirals achieves the best balance between material homogenization effect and flow efficiency.
[0026] Compared with existing technologies, the beneficial effects of the material equalization buffer bin structure of the Raymond mill front-end feeding device provided by this utility model are as follows: By designing the bin body into an inverted frustum shape and setting a spiral curved guide plate inside it, the material undergoes a sufficient spiral motion and homogenization process before entering the Raymond mill main unit. The movement path of the material in the spiral channel is greatly extended, and the residence time is increased, achieving full dispersion and uniform distribution of the material. The gradient change design of the guide plate pitch and inclination angle ensures a smooth transition of the material flow state, avoiding material stagnation and impact. The design of the wavy outer edge and through holes further enhances the mixing and homogenization effect of the material. The intermittent spiral channel formed by the vertical grooves in the wall and the guide plate balances the residence time and flow efficiency. The trumpet-shaped structure and axial convex ridges of the discharge port ensure a smooth transition and uniform distribution of materials to downstream equipment. The overall structure is simple and reliable, requiring no additional power unit. It achieves the material uniformity and buffering function solely through the material's own weight and the ingenious design of the structure. Compared with existing technologies, this utility model significantly improves the uniformity and stability of materials entering the grinding system, effectively improves the grinding efficiency and product quality of Raymond mills, reduces equipment wear, and extends service life. At the same time, it has a compact structure, is easy to install and maintain, and has good practical value and prospects for widespread application. Attached Figure Description
[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0028] Figure 1 A perspective view of the material equalization buffer bin structure of a Raymond mill front-end feeding device;
[0029] Figure 2 A cross-sectional view of the material equalization buffer bin structure of a Raymond mill front-end feeding device;
[0030] The attached diagram lists the components represented by each number as follows:
[0031] 10. Bin body; 20. Baffle plate; 30. Discharge port. Detailed Implementation
[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.
[0033] like Figure 1 , Figure 2The diagram shown is an example of the material equalization buffer bin structure of the Raymond mill front-end feeding device provided by this utility model. It includes a bin body 10, a guide plate 20, and a discharge port 30. The bin body 10 is shaped like an inverted frustum, and the upper opening area of the bin body 10 is larger than the lower opening area. The guide plate 20 is disposed inside the bin body 10 and fixedly connected to the inner wall of the bin body 10. The guide plate 20 is helical curved, and the pitch of the helical curved surface gradually decreases from top to bottom along the axial direction of the bin body 10. A helical channel is formed between the outer edge of the guide plate 20 and the inner wall of the bin body 10. The discharge port 30 is located at the center of the bottom of the bin body 10. The inner wall of the discharge port 30 expands downward in a trumpet shape. When the material enters from the upper end of the bin body 10, the helical curved surface of the guide plate 20 guides the material to move downward in a helical motion along the inner wall of the bin body 10.
[0034] The specific operation or usage method is as follows: When using the material equalization buffer bin structure of this utility model, first install the bin body above the feed inlet of the Raymond mill main unit, ensuring that the discharge port of the bin body is well connected and reliably sealed with the feed inlet of the main unit. The upper opening of the bin body is connected to the upstream conveying equipment or hopper. Before starting feeding, check whether the connection between the guide plate and the inner wall of the bin body is firm, whether there is any residual material or debris inside the bin body, and ensure that the spiral channel is unobstructed. Start the upstream conveying equipment, and the material begins to enter from the upper opening of the bin body. Under the action of gravity, the material first undergoes initial diffusion in the larger space at the top of the bin body, and then begins to spiral down along the inner wall of the bin body under the guidance of the spiral curved surface of the guide plate. In the initial stage of operation, the material gradually fills the spiral channel. At this time, the distribution of the material in the bin body should be observed. Under normal circumstances, the material should be evenly distributed in the spiral channel without local accumulation or bridging. As the material continues to enter, a stable material flow state is formed in the bin body. At this time, the upstream feeding speed can be adjusted according to the processing capacity of the downstream Raymond mill main unit to maintain an appropriate material storage in the bin body, so as to play a buffering role without causing any problems. Excessive material accumulation can occur. During normal operation, the material is homogenized through the spiral channel and then enters the Raymond mill main unit from the discharge port at a stable and uniform flow rate. At this time, the operating status of the main unit should be monitored, including parameters such as current, vibration, and product particle size. If all parameters are stable, it indicates that the material homogenization buffer silo has achieved the expected effect. When it is necessary to stop feeding, first stop the upstream conveying equipment and allow the material in the silo to drain naturally. After no more material flows out of the discharge port, the operation of the Raymond mill main unit can be stopped. After shutdown, the inside of the silo should be cleaned in time, especially the surface of the guide plate and... At the discharge port, to prevent material residue from solidifying and affecting future use, regularly check the welded joints between the guide plate and the hopper for cracks or loosening, and check the corrugated outer edge and through holes for wear or blockage. Repair or replace as necessary. For materials that are prone to adhesion, use compressed air or mechanical tools to clean the inner wall of the hopper and the surface of the guide plate during downtime to keep the surface smooth and reduce material adhesion. With proper operation and regular maintenance, the material equalization and buffering hopper structure of this utility model can stably perform the functions of material equalization and buffering for a long time, significantly improving the working performance of the Raymond mill.
[0035] In the above technical solution, the angle between the spiral surface of the guide plate 20 and the axis of the hopper gradually increases from 35° to 55° along the axial direction from top to bottom.
[0036] Furthermore, in the above technical solution, the ratio of the upper opening diameter to the lower opening diameter of the inverted frustum structure of the silo body 10 is 3:1 to 5:1.
[0037] Furthermore, in the above technical solution, the outer edge of the guide plate 20 is wavy, and the crests and troughs of the wave alternate along the spiral direction. The gap between the crest and the inner wall of the hopper 10 is smaller than the gap between the trough and the inner wall of the hopper 10.
[0038] Furthermore, in the above technical solution, the spiral curved surface of the guide plate 20 is provided with multiple through holes, which are elliptical in shape, and the major axis of the elliptical through holes is parallel to the spiral downward direction of the material.
[0039] Furthermore, in the above technical solution, the expansion angle of the funnel-shaped inner wall of the discharge port 30 is 15° to 25°, and the surface of the funnel-shaped inner wall is provided with multiple convex ridges extending along the axial direction.
[0040] Furthermore, in the above technical solution, the inner wall surface of the silo 10 is provided with multiple vertical grooves extending along the axial direction. The depth of the vertical grooves gradually increases from top to bottom along the axial direction, and an intermittent spiral channel is formed between the vertical grooves and the outer edge of the guide plate 20.
[0041] Furthermore, in the above technical solution, the fixed connection between the guide plate 20 and the inner wall of the tank body 10 is achieved by welding, and the welding position is located at the trough of the outer edge of the guide plate 20.
[0042] Furthermore, in the above technical solution, the hopper body 10 is made of stainless steel plate with a wall thickness of 8mm to 12mm, and the guide plate 20 is made of carbon steel plate with a thickness of 6mm to 10mm.
[0043] Furthermore, in the above technical solution, the starting end of the spiral surface of the guide plate 20 is located 50mm to 80mm below the upper opening of the hopper 10, and the ending end of the spiral surface is located 100mm to 150mm above the discharge port 30, and the spiral surface completes 2 to 3 full spirals.
[0044] Specific Implementation Example 1: In this embodiment, the silo body is made of SUS304 stainless steel plate with a thickness of 10 mm. The silo body is in the shape of an inverted truncated cone, with an upper opening diameter of 1200 mm and a lower opening diameter of 300 mm, a diameter ratio of 4:1. The total height of the silo body is 1800 mm. The angle between the inclined surface of the inverted cone and the vertical direction is 25 degrees. This size design gives the silo body an effective volume of approximately 1.2 cubic meters, providing ample buffer space for materials. The guide plate is made of Q235 carbon steel plate with a thickness of 8 mm. The guide plate is in the shape of a spiral curved surface, starting 60 mm below the upper opening of the silo body and ending 120 mm above the discharge port, completing the process within this height range.The flow consists of five complete spirals. The pitch of the spiral surface decreases linearly from 700 mm at the beginning to 450 mm at the end. The angle between the spiral surface and the silo axis is 40 degrees at the beginning and 50 degrees at the end. This pitch and angle design allows for a longer spiral path and slower descent speed in the upper part of the silo, while the spiral path is relatively shorter and the descent speed is faster in the lower part, achieving a smooth transition in material flow. The outer edge of the guide plate is wavy, with a wave period of 300 mm. The gap between the wave crest and the inner wall of the silo is 15 mm, and the gap between the wave trough and the inner wall of the silo is 35 mm. The wavy outer edge is evenly distributed along the spiral direction, forming six complete wave cycles on the entire spiral surface. Eighteen elliptical through-holes are formed on the curved surface. The major axis of each through-hole is 120 mm, and the minor axis is 60 mm. The major axis is parallel to the direction of the material spiral descent. The through-holes are evenly distributed along the spiral direction, with a spacing of 350 mm between adjacent through-holes. The edges of the through-holes are rounded with a radius of 5 mm to avoid interference with material flow and stress concentration on the guide plate itself. The guide plate is fixed to the inner wall of the silo at the troughs by argon arc welding. The weld length is approximately 50 mm at each location, and the weld spacing is approximately 300 mm. The welding position avoids the crests, maintaining a small gap between the crests and the inner wall to guide the material. Twelve vertical grooves are formed on the inner wall of the silo, evenly distributed along the circumference of the silo, with a central angle of 3° between adjacent grooves. The groove is 40 mm wide and 10 mm deep at the top and 25 mm deep at the bottom of the silo, with the depth increasing linearly along the axial direction. The groove has a U-shaped cross-section with a bottom rounded radius of 8 mm. The discharge port is located at the center of the bottom of the silo. The upper diameter of the discharge port is 300 mm, the same as the lower opening diameter, while the lower diameter is 400 mm. The height of the discharge port is 150 mm. The flared inner wall has an expansion angle of 20 degrees. Eight axially extending ridges are evenly distributed on the flared inner wall. Each ridge is 8 mm high, 15 mm wide, and has a semi-circular cross-section. The ridges extend from the upper to the lower end of the discharge port, with a central angle of 45 degrees between adjacent ridges. The weight of the entire silo structure is approximately 3. Weighing 50 kg, this material can be stably installed on the support frame of the Raymond mill main unit. In practical use, the material equalization buffer bin of this embodiment can handle non-metallic minerals with a hardness not exceeding 7, such as limestone, calcite, and dolomite. When the material feed rate is 3 to 8 tons per hour, the bin can maintain a stable material flow state. After being homogenized by the spiral channel, the material enters the Raymond mill main unit evenly from the outlet. The material distribution in the grinding chamber of the main unit is uniform, the working load of the grinding rollers and grinding ring is balanced, and the grinding efficiency and product particle size stability are significantly improved. When the upstream feed rate fluctuates by ±20%, due to the buffering effect of the bin, the change in the material flow rate output to the main unit is controlled within ±5%, ensuring the stability of the main unit's operation.
[0045] Specific Embodiment 2: This Embodiment 2 is based on Embodiment 1, increasing the number of elliptical through-holes on the spiral surface of the guide plate to 30, adjusting the major axis dimension of the through-holes to 100 mm, the minor axis dimension to 50 mm, and shortening the spacing of the through-holes along the spiral direction to 220 mm. The increased density of the through-holes allows for more crossing channels for the material during its spiral descent. This improvement diversifies the material flow path selection, allowing some materials to descend rapidly through the through-holes more frequently, reducing the tendency for material accumulation in the spiral channel. It is particularly suitable for materials with poor flowability or prone to arching. Simultaneously, on the inner wall of the silo... Inclined guide plates are added to the vertical groove. The guide plates extend inclinedly from one side wall of the groove to the other side wall at an angle of 15 degrees. One guide plate is set every 200 mm along the axial direction of the groove. The function of the guide plates is to guide the material entering the groove to generate rotational motion, so that the material obtains a certain lateral motion component while rapidly descending through the groove, further enhancing the mixing and homogenization effect of the material. This embodiment is particularly suitable for processing materials with high viscosity or high moisture content. By increasing the number of through holes and setting guide plates, the adhesion and blockage of materials in the spiral channel and vertical groove are effectively prevented, maintaining the continuity and uniformity of material flow.
[0046] Specifically, the principle of this utility model is as follows: The core of this utility model lies in the combination structure of an inverted frustum-shaped silo and a spiral curved guide plate. Through a purely mechanical means, it achieves material homogenization and buffering. When material enters from the top of the silo, the inverted frustum-shaped silo space provides initial diffusion space, preventing excessive concentration of material flow. The spiral curved surface of the guide plate forces the material to spiral downwards along the inner wall of the silo. This spiral motion significantly extends the material's path, allowing sufficient time and space for mixing and homogenization of materials entering from different batches or positions. The design of the guide plate's gradually decreasing pitch along the axial direction results in a larger horizontal motion component and a slower descent speed at the top of the silo, which is beneficial for initial dispersion. At the bottom of the silo, the horizontal motion component decreases while the descent speed increases, facilitating material convergence towards the outlet. This achieves a gradual adjustment of the material flow state. The gradient change of the angle between the spiral curved surface and the silo axis further optimizes this process, ensuring that the material maintains an appropriate flow speed and distribution at different heights. The wavy design of the outer edge of the guide plate and the through holes on the curved surface further enhance this process. Multiple path options are provided for material flow. Some materials move along the spiral channel, some descend through the through-holes, and some gain buffer space through the larger gaps at the troughs. This multi-path flow avoids the blockage and compression that may occur with a single channel, making the material flow smoother and more uniform. The intermittent spiral channel formed by the vertical grooves on the inner wall of the silo and the guide plate produces a periodic diversion and convergence effect, further enhancing the mixing and homogenization of the materials. When the materials reach the discharge port after sufficient spiral motion, they have formed a uniformly distributed material flow. The funnel-shaped structure of the discharge port allows this uniformly distributed material flow to smoothly transition to the downstream grinding system. The axial convex ridges on the inner wall ensure the uniform distribution of materials along the axial direction. Throughout the process, the gravitational potential energy of the materials is gradually released, avoiding the impact caused by direct fall. At the same time, the volume of the silo provides a buffer space for fluctuations in the upstream feed rate, so that even if there are instantaneous changes in the feed rate, the material flow output to the grinding system can remain relatively stable, thereby ensuring the stable operation of the grinding system and the consistency of product quality.
Claims
1. A material equalization buffer bin structure for a Raymond mill front-end feeding device, comprising a bin body, a guide plate, and a discharge port, characterized in that... The silo body is shaped like an inverted frustum, with the upper opening area larger than the lower opening area. The guide plate is located inside the silo body and is fixedly connected to the inner wall of the silo body. The guide plate has a spiral curved surface shape, and the pitch of the spiral curved surface gradually decreases from top to bottom along the axial direction of the silo body. A spiral channel is formed between the outer edge of the guide plate and the inner wall of the silo body. The discharge port is located at the center of the bottom of the silo body, and the inner wall of the discharge port expands downward in a trumpet shape. When the material enters from the upper end of the silo body, the spiral curved surface of the guide plate guides the material to spiral downward along the inner wall of the silo body.
2. The material equalization buffer bin structure of the Raymond mill front-end feeding device according to claim 1, characterized in that, The angle between the spiral surface of the guide plate and the axis of the hopper gradually increases from 35° to 55° from top to bottom along the axial direction.
3. The material equalization buffer bin structure of the Raymond mill front-end feeding device according to claim 2, characterized in that, The ratio of the upper opening diameter to the lower opening diameter of the inverted frustum structure of the silo is 3:1 to 5:
1.
4. The material equalization buffer bin structure of the Raymond mill front-end feeding device according to claim 3, characterized in that, The outer edge of the guide plate is wavy, with wave crests and troughs alternating along a spiral direction. The gap between the wave crest and the inner wall of the hopper is smaller than the gap between the wave trough and the inner wall of the hopper.
5. The material equalization buffer bin structure of the Raymond mill front-end feeding device according to claim 4, characterized in that, The guide plate has multiple through holes on its spiral curved surface. The through holes are elliptical in shape, and the major axis of the elliptical through holes is parallel to the direction of the material spiraling downward.
6. The material equalization buffer bin structure of the Raymond mill front-end feeding device according to claim 5, characterized in that, The expansion angle of the funnel-shaped inner wall of the discharge port is 15° to 25°, and the surface of the funnel-shaped inner wall is provided with multiple convex ridges extending along the axial direction.
7. The material equalization buffer bin structure of the Raymond mill front-end feeding device according to claim 6, characterized in that, The inner wall surface of the chamber is provided with multiple vertical grooves extending along the axial direction. The depth of the vertical grooves gradually increases from top to bottom along the axial direction, and an intermittent spiral channel is formed between the vertical grooves and the outer edge of the guide plate.
8. The material equalization buffer bin structure of the Raymond mill front-end feeding device according to claim 7, characterized in that, The guide plate is fixedly connected to the inner wall of the hopper by welding, and the welding position is located at the trough of the outer edge of the guide plate.
9. The material equalization buffer bin structure of the Raymond mill front-end feeding device according to claim 8, characterized in that, The chamber body is made of stainless steel plate with a wall thickness of 8mm to 12mm, and the baffle is made of carbon steel plate with a thickness of 6mm to 10mm.
10. The material equalization buffer bin structure of the Raymond mill front-end feeding device according to claim 9, characterized in that, The starting end of the spiral surface of the guide plate is located 50mm to 80mm below the opening at the upper end of the hopper, and the ending end of the spiral surface is located 100mm to 150mm above the discharge port. The spiral surface completes 2 to 3 full spiral turns.